{"id":17163,"date":"2026-07-31T09:28:48","date_gmt":"2026-07-31T01:28:48","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=17163"},"modified":"2026-09-15T07:55:23","modified_gmt":"2026-09-14T23:55:23","slug":"tool-steel-annealing-normalizing-temperature-chart","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/tool-steel-annealing-normalizing-temperature-chart\/","title":{"rendered":"\uacf5\uad6c\uac15 \uc5b4\ub2d0\ub9c1 \ubc0f \ub178\uba40\ub77c\uc774\uc9d5 \uc628\ub3c4\ud45c"},"content":{"rendered":"\n<style>.aobo-ht-ref {\n    --aobo-accent: #2563eb;\n    --aobo-accent-dark: #1e1e2e;\n    --aobo-blue: #0c56d0;\n    --aobo-blue-dark: #073b91;\n    --aobo-text: #333;\n    --aobo-muted: #888;\n    --aobo-border: #e5e7eb;\n    --aobo-border-dark: #ddd;\n    --aobo-stripe: #f7f7f9;\n    --aobo-hover: #e8f0fe;\n    --aobo-radius: 8px;\n    --aobo-radius-sm: 6px;\n    --aobo-card-bg: #fff;\n    --aobo-orange: #f59e0b;\n    --aobo-green: #059669;\n    --aobo-red: #dc2626;\n    color: var(--aobo-text);\n    background: transparent;\n    padding: 0;\n    box-sizing: border-box;\n    font-family: -apple-system, BlinkMacSystemFont, \"Segoe UI\", Roboto, \"Helvetica Neue\", Arial, sans-serif;\n    line-height: 1.6;\n  }\n\n  .aobo-ht-ref * { box-sizing: border-box; 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text-decoration: none !important; }\n  .aobo-ht-ref a:hover { text-decoration: underline !important; }\n\n  .aobo-related {\n    margin-top: 1.2em;\n    background: #fff;\n    border: 1px solid var(--aobo-border);\n    border-left: 3px solid var(--aobo-accent);\n    border-radius: 0 var(--aobo-radius) var(--aobo-radius) 0;\n    padding: 1em 1.2em;\n  }\n\n  .aobo-related h3 { margin: 0 0 .5em; font-size: 1em; color: var(--aobo-text); }\n  .aobo-related p { margin: 0; font-size: .85em; line-height: 1.9; color: var(--aobo-muted); }\n  .aobo-related p a { font-weight: 600; }\n\n  \/* Phones: the two tab labels cannot share one row without the second one\n     running off screen (measured on the live page: right edge 423 px at a\n     390 px viewport). Stack them instead. *\/\n  @media (max-width: 520px) {\n    .aobo-tabs { flex-wrap: wrap; }\n    .aobo-ht-ref .aobo-tabs .aobo-tab { flex: 1 1 100% !important; padding: .55em .6em !important; }\n    .aobo-ht-ref .aobo-tabs .aobo-tab:not(:last-child) {\n      border-right: none !important;\n      border-bottom: 1px solid var(--aobo-border) !important;\n    }\n  }\n<\/style>\n<section class=\"aobo-ht-ref\" id=\"aoboHtRef\">\n  <div class=\"aobo-wrap\">\n    <div class=\"aobo-hero\">\n      <div class=\"aobo-hero-top\">\n        <div class=\"aobo-kicker\"><span><\/span>Tool Steel Heat Treatment Data<\/div>\n        <h1>Normalizing, Annealing, Hardening &amp; Tempering of Tool Steels<\/h1>\n        <p>Complete reference for heat-treating temperatures of all major tool steel grades. Search by grade name, toggle between \u00b0C and \u00b0F, and expand each category group for full specification data. The quench and temper schedule is also published as a standalone table in the <a href=\"https:\/\/aobosteel.com\/tool-steel-hardening-tempering-chart\/\">hardening and tempering temperature chart<\/a>, and the overall process sequence is covered in the <a href=\"https:\/\/aobosteel.com\/tool-steel-heat-treatment-guide\/\">tool steel heat treatment guide<\/a>.<\/p>\n      <\/div>\n\n      <div class=\"aobo-tool-area\">\n        <!-- Tab and unit state as real radio inputs: switching works without JavaScript -->\n        <input type=\"radio\" name=\"aobo-ht-tab\" id=\"aoboHtTab8\" class=\"aobo-sr\" checked>\n        <input type=\"radio\" name=\"aobo-ht-tab\" id=\"aoboHtTab9\" class=\"aobo-sr\">\n        <input type=\"radio\" name=\"aobo-ht-unit\" id=\"aoboUnitC\" class=\"aobo-sr\">\n        <input type=\"radio\" name=\"aobo-ht-unit\" id=\"aoboUnitF\" class=\"aobo-sr\">\n        <input type=\"radio\" name=\"aobo-ht-unit\" id=\"aoboUnitBoth\" class=\"aobo-sr\" checked>\n\n        <!-- Tabs -->\n        <div class=\"aobo-tabs\">\n          <label class=\"aobo-tab\" for=\"aoboHtTab8\">Normalizing &amp; Annealing<\/label>\n          <label class=\"aobo-tab\" for=\"aoboHtTab9\">Hardening &amp; Tempering<\/label>\n        <\/div>\n\n        <!-- Control bar -->\n        <div class=\"aobo-control-bar\">\n          <div class=\"aobo-search-box\">\n            <input type=\"text\" id=\"aoboSearchInput\" aria-label=\"Search tool steel grades\" placeholder=\"Search grade (e.g. H13, D2, M2, S7...)\">\n          <\/div>\n          <div class=\"aobo-unit-toggle\">\n            <label for=\"aoboUnitC\">\u00b0C<\/label>\n            <label for=\"aoboUnitF\">\u00b0F<\/label>\n            <label for=\"aoboUnitBoth\">Both<\/label>\n          <\/div>\n          <button class=\"aobo-reset-btn\" id=\"aoboResetBtn\" type=\"button\">Reset<\/button>\n        <\/div>\n\n        <!-- Legend -->\n        <div class=\"aobo-legend\">\n          <span class=\"aobo-legend-item\"><strong>O<\/strong> = Oil quench<\/span>\n          <span class=\"aobo-legend-item\"><strong>A<\/strong> = Air cool<\/span>\n          <span class=\"aobo-legend-item\"><strong>S<\/strong> = Salt bath quench<\/span>\n          <span class=\"aobo-legend-item\"><strong>W<\/strong> = Water quench<\/span>\n          <span class=\"aobo-legend-item\"><strong>B<\/strong> = Brine quench<\/span>\n        <\/div>\n\n        <!-- No results -->\n        <div class=\"aobo-no-results\" id=\"aoboNoResults\">No matching grade found. Try a different search term.<\/div>\n\n        <!-- Table 8: Normalizing & Annealing -->\n        <div class=\"aobo-table-area\" id=\"aoboPanel8\">\n          <details class=\"aobo-cat-section\" open>\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\"><a href=\"https:\/\/aobosteel.com\/high-speed-steels\/\">Molybdenum High-Speed Steels<\/a> <span class=\"aobo-cat-badge\">9 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"m1, m10\">\n                    <td class=\"aobo-grade-cell\">M1, M10<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">815-870<\/td>\n                    <td class=\"aobo-f-col\">1500-1600<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>207-235<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m2\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/m2-tool-steel\/\">M2<\/a><\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>212-241<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m3, m4\">\n                    <td class=\"aobo-grade-cell\">M3, M4<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>223-255<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m7\">\n                    <td class=\"aobo-grade-cell\">M7<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">815-870<\/td>\n                    <td class=\"aobo-f-col\">1500-1600<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>217-255<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m30, m33, m34, m35, m36, m41, m42, m46, m47\">\n                    <td class=\"aobo-grade-cell\">M30, M33, M34, <a href=\"https:\/\/aobosteel.com\/m35-tool-steel\/\">M35<\/a>, M36, M41, <a href=\"https:\/\/aobosteel.com\/m42-tool-steel\/\">M42<\/a>, M46, M47<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>235-269<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m43\">\n                    <td class=\"aobo-grade-cell\">M43<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>248-269<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m44\">\n                    <td class=\"aobo-grade-cell\">M44<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>248-293<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m48\">\n                    <td class=\"aobo-grade-cell\">M48<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>285-311<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m62\">\n                    <td class=\"aobo-grade-cell\">M62<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>262-285<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Tungsten High-Speed Steels <span class=\"aobo-cat-badge\">7 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"t1\">\n                    <td class=\"aobo-grade-cell\">T1<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>217-255<\/td>\n                  <\/tr>\n                  <tr data-grade=\"t2\">\n                    <td class=\"aobo-grade-cell\">T2<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>223-255<\/td>\n                  <\/tr>\n                  <tr data-grade=\"t4\">\n                    <td class=\"aobo-grade-cell\">T4<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>229-269<\/td>\n                  <\/tr>\n                  <tr data-grade=\"t5\">\n                    <td class=\"aobo-grade-cell\">T5<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>235-277<\/td>\n                  <\/tr>\n                  <tr data-grade=\"t6\">\n                    <td class=\"aobo-grade-cell\">T6<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>248-293<\/td>\n                  <\/tr>\n                  <tr data-grade=\"t8\">\n                    <td class=\"aobo-grade-cell\">T8<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>229-255<\/td>\n                  <\/tr>\n                  <tr data-grade=\"t15\">\n                    <td class=\"aobo-grade-cell\">T15<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>241-277<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Intermediate High-Speed Steels <span class=\"aobo-cat-badge\">2 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"m50\">\n                    <td class=\"aobo-grade-cell\">M50<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">830-845<\/td>\n                    <td class=\"aobo-f-col\">1525-1550<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>197-235<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m52\">\n                    <td class=\"aobo-grade-cell\">M52<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">830-845<\/td>\n                    <td class=\"aobo-f-col\">1525-1550<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>197-235<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\"><a href=\"https:\/\/aobosteel.com\/hot-work-tool-steels\/\">Chromium Hot-Work Steels<\/a> <span class=\"aobo-cat-badge\">3 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"h10, h11, h12, h13\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/h10-tool-steel\/\">H10<\/a>, <a href=\"https:\/\/aobosteel.com\/h11-tool-steel\/\">H11<\/a>, H12, <a href=\"https:\/\/aobosteel.com\/h13-tool-steel\/\">H13<\/a><\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">845-900<\/td>\n                    <td class=\"aobo-f-col\">1550-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>192-229<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h14\">\n                    <td class=\"aobo-grade-cell\">H14<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>207-235<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h19\">\n                    <td class=\"aobo-grade-cell\">H19<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>207-241<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Tungsten Hot-Work Steels <span class=\"aobo-cat-badge\">3 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"h21, h22, h25\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/h21-tool-steel\/\">H21<\/a>, H22, H25<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>207-235<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h23\">\n                    <td class=\"aobo-grade-cell\">H23<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>212-255<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h24, h26\">\n                    <td class=\"aobo-grade-cell\">H24, H26<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>217-241<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Molybdenum Hot-Work Steels <span class=\"aobo-cat-badge\">2 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"h41, h43\">\n                    <td class=\"aobo-grade-cell\">H41, H43<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">815-870<\/td>\n                    <td class=\"aobo-f-col\">1500-1600<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>207-235<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h42\">\n                    <td class=\"aobo-grade-cell\">H42<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">845-900<\/td>\n                    <td class=\"aobo-f-col\">1550-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>207-235<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\"><a href=\"https:\/\/aobosteel.com\/d-series-tool-steels\/\">High-Carbon, High-Chromium Cold-Work Steels<\/a> <span class=\"aobo-cat-badge\">3 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"d2, d3, d4\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/d2-tool-steel\/\">D2<\/a>, <a href=\"https:\/\/aobosteel.com\/d3-tool-steel\/\">D3<\/a>, D4<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>217-255<\/td>\n                  <\/tr>\n                  <tr data-grade=\"d5\">\n                    <td class=\"aobo-grade-cell\">D5<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>223-255<\/td>\n                  <\/tr>\n                  <tr data-grade=\"d7\">\n                    <td class=\"aobo-grade-cell\">D7<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>235-262<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\"><a href=\"https:\/\/aobosteel.com\/air-hardening-tool-steel\/\">Medium-Alloy, Air-Hardening Cold-Work Steels<\/a> <span class=\"aobo-cat-badge\">8 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"a2\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/a2-tool-steel\/\">A2<\/a><\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">845-870<\/td>\n                    <td class=\"aobo-f-col\">1550-1600<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>201-229<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a3\">\n                    <td class=\"aobo-grade-cell\">A3<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">845-870<\/td>\n                    <td class=\"aobo-f-col\">1550-1600<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>207-229<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a4\">\n                    <td class=\"aobo-grade-cell\">A4<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">740-760<\/td>\n                    <td class=\"aobo-f-col\">1360-1400<\/td>\n                    <td class=\"aobo-c-col\">14<\/td>\n                    <td class=\"aobo-f-col\">25<\/td>\n                    <td>200-241<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a6\">\n                    <td class=\"aobo-grade-cell\">A6<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">730-745<\/td>\n                    <td class=\"aobo-f-col\">1350-1375<\/td>\n                    <td class=\"aobo-c-col\">14<\/td>\n                    <td class=\"aobo-f-col\">25<\/td>\n                    <td>217-248<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a7\">\n                    <td class=\"aobo-grade-cell\">A7<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">14<\/td>\n                    <td class=\"aobo-f-col\">25<\/td>\n                    <td>235-262<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a8\">\n                    <td class=\"aobo-grade-cell\">A8<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">845-870<\/td>\n                    <td class=\"aobo-f-col\">1550-1600<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>192-223<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a9\">\n                    <td class=\"aobo-grade-cell\">A9<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">845-870<\/td>\n                    <td class=\"aobo-f-col\">1550-1600<\/td>\n                    <td class=\"aobo-c-col\">14<\/td>\n                    <td class=\"aobo-f-col\">25<\/td>\n                    <td>212-248<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a10\">\n                    <td class=\"aobo-grade-cell\">A10<\/td>\n                    <td>790 \/ 1450<\/td>\n                    <td class=\"aobo-c-col\">765-795<\/td>\n                    <td class=\"aobo-f-col\">1410-1460<\/td>\n                    <td class=\"aobo-c-col\">8<\/td>\n                    <td class=\"aobo-f-col\">15<\/td>\n                    <td>235-269<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\"><a href=\"https:\/\/aobosteel.com\/oil-hardening-tool-steel\/\">Oil-Hardening Cold-Work Steels<\/a> <span class=\"aobo-cat-badge\">4 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"o1\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/o1-tool-steel\/\">O1<\/a><\/td>\n                    <td>870 \/ 1600<\/td>\n                    <td class=\"aobo-c-col\">760-790<\/td>\n                    <td class=\"aobo-f-col\">1400-1450<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>183-212<\/td>\n                  <\/tr>\n                  <tr data-grade=\"o2\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/o2-tool-steel\/\">O2<\/a><\/td>\n                    <td>845 \/ 1550<\/td>\n                    <td class=\"aobo-c-col\">770-845<\/td>\n                    <td class=\"aobo-f-col\">1375-1425<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>183-212<\/td>\n                  <\/tr>\n                  <tr data-grade=\"o6\">\n                    <td class=\"aobo-grade-cell\">O6<\/td>\n                    <td>870 \/ 1600<\/td>\n                    <td class=\"aobo-c-col\">765-790<\/td>\n                    <td class=\"aobo-f-col\">1410-1450<\/td>\n                    <td class=\"aobo-c-col\">11<\/td>\n                    <td class=\"aobo-f-col\">20<\/td>\n                    <td>183-217<\/td>\n                  <\/tr>\n                  <tr data-grade=\"o7\">\n                    <td class=\"aobo-grade-cell\">O7<\/td>\n                    <td>900 \/ 1650<\/td>\n                    <td class=\"aobo-c-col\">790-815<\/td>\n                    <td class=\"aobo-f-col\">1450-1500<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>192-217<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\"><a href=\"https:\/\/aobosteel.com\/s-series-tool-steel\/\">Shock-Resisting Steels<\/a> <span class=\"aobo-cat-badge\">4 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"s1\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/s1-tool-steel\/\">S1<\/a><\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">790-815<\/td>\n                    <td class=\"aobo-f-col\">1450-1500<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>183-229 (c)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"s2\">\n                    <td class=\"aobo-grade-cell\">S2<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">760-790<\/td>\n                    <td class=\"aobo-f-col\">1400-1450<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>192-217<\/td>\n                  <\/tr>\n                  <tr data-grade=\"s5\">\n                    <td class=\"aobo-grade-cell\">S5<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">775-800<\/td>\n                    <td class=\"aobo-f-col\">1425-1475<\/td>\n                    <td class=\"aobo-c-col\">14<\/td>\n                    <td class=\"aobo-f-col\">25<\/td>\n                    <td>192-229<\/td>\n                  <\/tr>\n                  <tr data-grade=\"s7\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/s7-tool-steel\/\">S7<\/a><\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">815-845<\/td>\n                    <td class=\"aobo-f-col\">1500-1550<\/td>\n                    <td class=\"aobo-c-col\">14<\/td>\n                    <td class=\"aobo-f-col\">25<\/td>\n                    <td>187-223<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\"><a href=\"https:\/\/aobosteel.com\/plastic-mold-steels\/\">Mold Steels<\/a> <span class=\"aobo-cat-badge\">7 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"p2\">\n                    <td class=\"aobo-grade-cell\">P2<\/td>\n                    <td><span class=\"aobo-no\">Not required<\/span><\/td>\n                    <td class=\"aobo-c-col\">730-815<\/td>\n                    <td class=\"aobo-f-col\">1350-1500<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>103-123<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p3\">\n                    <td class=\"aobo-grade-cell\">P3<\/td>\n                    <td><span class=\"aobo-no\">Not required<\/span><\/td>\n                    <td class=\"aobo-c-col\">730-815<\/td>\n                    <td class=\"aobo-f-col\">1350-1500<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>109-137<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p4\">\n                    <td class=\"aobo-grade-cell\">P4<\/td>\n                    <td><span class=\"aobo-no\">Do not normalize<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900<\/td>\n                    <td class=\"aobo-f-col\">1600-1650<\/td>\n                    <td class=\"aobo-c-col\">14<\/td>\n                    <td class=\"aobo-f-col\">25<\/td>\n                    <td>116-128<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p5\">\n                    <td class=\"aobo-grade-cell\">P5<\/td>\n                    <td><span class=\"aobo-no\">Not required<\/span><\/td>\n                    <td class=\"aobo-c-col\">845-870<\/td>\n                    <td class=\"aobo-f-col\">1550-1600<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>105-116<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p6\">\n                    <td class=\"aobo-grade-cell\">P6<\/td>\n                    <td><span class=\"aobo-no\">Not required<\/span><\/td>\n                    <td class=\"aobo-c-col\">845<\/td>\n                    <td class=\"aobo-f-col\">1550<\/td>\n                    <td class=\"aobo-c-col\">8<\/td>\n                    <td class=\"aobo-f-col\">15<\/td>\n                    <td>183-217<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p20\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/p20-tool-steel\/\">P20<\/a><\/td>\n                    <td>900 \/ 1650<\/td>\n                    <td class=\"aobo-c-col\">760-790<\/td>\n                    <td class=\"aobo-f-col\">1400-1450<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>149-179<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p21\">\n                    <td class=\"aobo-grade-cell\">P21<\/td>\n                    <td>900 \/ 1650<\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-no\">Do not anneal<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-no\">Do not anneal<\/span><\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Low-Alloy Special-Purpose Steels <span class=\"aobo-cat-badge\">3 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"l2\">\n                    <td class=\"aobo-grade-cell\">L2<\/td>\n                    <td>871-900 \/ 1600-1650<\/td>\n                    <td class=\"aobo-c-col\">760-790<\/td>\n                    <td class=\"aobo-f-col\">1400-1450<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>163-197<\/td>\n                  <\/tr>\n                  <tr data-grade=\"l3\">\n                    <td class=\"aobo-grade-cell\">L3<\/td>\n                    <td>900 \/ 1650<\/td>\n                    <td class=\"aobo-c-col\">790-815<\/td>\n                    <td class=\"aobo-f-col\">1450-1500<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>174-201<\/td>\n                  <\/tr>\n                  <tr data-grade=\"l6\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/l6-tool-steel\/\">L6<\/a><\/td>\n                    <td>870 \/ 1600<\/td>\n                    <td class=\"aobo-c-col\">760-790<\/td>\n                    <td class=\"aobo-f-col\">1400-1450<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>183-212<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Carbon-Tungsten Special-Purpose Steels <span class=\"aobo-cat-badge\">2 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"f1\">\n                    <td class=\"aobo-grade-cell\">F1<\/td>\n                    <td>900 \/ 1650<\/td>\n                    <td class=\"aobo-c-col\">760-800<\/td>\n                    <td class=\"aobo-f-col\">1400-1475<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>183-207<\/td>\n                  <\/tr>\n                  <tr data-grade=\"f2\">\n                    <td class=\"aobo-grade-cell\">F2<\/td>\n                    <td>900 \/ 1650<\/td>\n                    <td class=\"aobo-c-col\">790-815<\/td>\n                    <td class=\"aobo-f-col\">1450-1500<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>207-235<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Water-Hardening Steels <span class=\"aobo-cat-badge\">2 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Normalizing (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Annealing \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Annealing \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Cooling max \u00b0C\/h<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Cooling max \u00b0F\/h<\/th>\n                  <th scope=\"col\">Hardness, HB<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"w1, w2\">\n                    <td class=\"aobo-grade-cell\">W1, W2<\/td>\n                    <td>790-925 (d)<\/td>\n                    <td class=\"aobo-c-col\">740-790 (e)<\/td>\n                    <td class=\"aobo-f-col\">1360-1450 (e)<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>156-201<\/td>\n                  <\/tr>\n                  <tr data-grade=\"w5\">\n                    <td class=\"aobo-grade-cell\">W5<\/td>\n                    <td>870-925 \/ 1600-1700<\/td>\n                    <td class=\"aobo-c-col\">760-790<\/td>\n                    <td class=\"aobo-f-col\">1400-1450<\/td>\n                    <td class=\"aobo-c-col\">22<\/td>\n                    <td class=\"aobo-f-col\">40<\/td>\n                    <td>163-201<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <div class=\"aobo-footnotes\">\n            <h3>Notes &amp; References<\/h3>\n            <ol>\n              <li>(a) Time held at temperature varies from 15 min for small sections to 1 h for large sizes. Cooling is done in still air. Normalizing should not be confused with low-temperature annealing.<\/li>\n              <li>(b) The upper limit of ranges should be used for large sections, and the lower limit for smaller sections. Time held at temperature varies from 1 h for light sections to 4 h for heavy sections and large furnace charges of high-alloy steel.<\/li>\n              <li>(c) For 0.25 Si type, 183 to 207 HB; for 1.00 Si type, 207 to 229 HB.<\/li>\n              <li>(d) Temperature varies with carbon content: 0.60\u20130.75 C, 815 \u00b0C (1500 \u00b0F); 0.75\u20130.90 C, 790 \u00b0C (1450 \u00b0F); 0.90\u20131.10 C, 870 \u00b0C (1600 \u00b0F); 1.10\u20131.40 C, 870\u2013925 \u00b0C (1600\u20131700 \u00b0F).<\/li>\n              <li>(e) Temperature varies with carbon content: 0.60\u20130.90 C, 740\u2013790 \u00b0C (1360\u20131450 \u00b0F); 0.90\u20131.40 C, 760\u2013790 \u00b0C (1400\u20131450 \u00b0F).<\/li>\n            <\/ol>\n          <\/div>\n        <\/div>\n\n        <!-- Table 9: Hardening & Tempering -->\n        <div class=\"aobo-table-area\" id=\"aoboPanel9\">\n          <details class=\"aobo-cat-section\" open>\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Molybdenum High-Speed Steels <span class=\"aobo-cat-badge\">12 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"m1, m7, m10\">\n                    <td class=\"aobo-grade-cell\">M1, M7, M10<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1175-1220 (b)<\/td>\n                    <td class=\"aobo-f-col\">2150-2225 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-595 (c)<\/td>\n                    <td class=\"aobo-f-col\">1000-1100 (c)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m2\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/m2-tool-steel-heat-treatment\/\">M2<\/a><\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1190-1230 (b)<\/td>\n                    <td class=\"aobo-f-col\">2175-2250 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-595 (c)<\/td>\n                    <td class=\"aobo-f-col\">1000-1100 (c)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m3, m4, m30, m33, m34, m35\">\n                    <td class=\"aobo-grade-cell\">M3, M4, M30, M33, M34, M35<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1205-1230 (b)<\/td>\n                    <td class=\"aobo-f-col\">2200-2250 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-595 (c)<\/td>\n                    <td class=\"aobo-f-col\">1000-1100 (c)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m36\">\n                    <td class=\"aobo-grade-cell\">M36<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1220-1245 (b)<\/td>\n                    <td class=\"aobo-f-col\">2225-2275 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-595 (c)<\/td>\n                    <td class=\"aobo-f-col\">1000-1100 (c)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m41\">\n                    <td class=\"aobo-grade-cell\">M41<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1190-1215 (b)<\/td>\n                    <td class=\"aobo-f-col\">2175-2220 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-595 (d)<\/td>\n                    <td class=\"aobo-f-col\">1000-1100 (d)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m42\">\n                    <td class=\"aobo-grade-cell\">M42<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1190-1210 (b)<\/td>\n                    <td class=\"aobo-f-col\">2175-2210 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">510-595 (d)<\/td>\n                    <td class=\"aobo-f-col\">950-1100 (d)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m43\">\n                    <td class=\"aobo-grade-cell\">M43<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1190-1215 (b)<\/td>\n                    <td class=\"aobo-f-col\">2175-2220 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">510-595 (d)<\/td>\n                    <td class=\"aobo-f-col\">950-1100 (d)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m44\">\n                    <td class=\"aobo-grade-cell\">M44<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1200-1225 (b)<\/td>\n                    <td class=\"aobo-f-col\">2190-2240 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-625 (d)<\/td>\n                    <td class=\"aobo-f-col\">1000-1160 (d)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m46\">\n                    <td class=\"aobo-grade-cell\">M46<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1190-1220 (b)<\/td>\n                    <td class=\"aobo-f-col\">2175-2225 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">525-565 (d)<\/td>\n                    <td class=\"aobo-f-col\">975-1050 (d)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m47\">\n                    <td class=\"aobo-grade-cell\">M47<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1175-1200 (b)<\/td>\n                    <td class=\"aobo-f-col\">2150-2200 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">525-595 (d)<\/td>\n                    <td class=\"aobo-f-col\">975-1100 (d)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m48\">\n                    <td class=\"aobo-grade-cell\">M48<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1175-1200 (b)<\/td>\n                    <td class=\"aobo-f-col\">2150-2200 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-595 (d)<\/td>\n                    <td class=\"aobo-f-col\">1000-1100 (d)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m62\">\n                    <td class=\"aobo-grade-cell\">M62<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1175-1200 (b)<\/td>\n                    <td class=\"aobo-f-col\">2150-2200 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-595 (d)<\/td>\n                    <td class=\"aobo-f-col\">1000-1100 (d)<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Tungsten High-Speed Steels <span class=\"aobo-cat-badge\">3 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"t1, t2, t4, t8\">\n                    <td class=\"aobo-grade-cell\">T1, T2, T4, T8<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">815-870<\/td>\n                    <td class=\"aobo-f-col\">1500-1600<\/td>\n                    <td class=\"aobo-c-col\">1260-1300 (b)<\/td>\n                    <td class=\"aobo-f-col\">2300-2375 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-595 (c)<\/td>\n                    <td class=\"aobo-f-col\">1000-1100 (c)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"t5, t6\">\n                    <td class=\"aobo-grade-cell\">T5, T6<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">815-870<\/td>\n                    <td class=\"aobo-f-col\">1500-1600<\/td>\n                    <td class=\"aobo-c-col\">1275-1300 (b)<\/td>\n                    <td class=\"aobo-f-col\">2325-2375 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-595 (c)<\/td>\n                    <td class=\"aobo-f-col\">1000-1100 (c)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"t15\">\n                    <td class=\"aobo-grade-cell\">T15<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">815-870<\/td>\n                    <td class=\"aobo-f-col\">1500-1600<\/td>\n                    <td class=\"aobo-c-col\">1205-1260 (b)<\/td>\n                    <td class=\"aobo-f-col\">2200-2300 (b)<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">540-650 (d)<\/td>\n                    <td class=\"aobo-f-col\">1000-1200 (d)<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Intermediate High-Speed Steels <span class=\"aobo-cat-badge\">2 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"m50\">\n                    <td class=\"aobo-grade-cell\">M50<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1095-1120<\/td>\n                    <td class=\"aobo-f-col\">2000-2050<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">525-595<\/td>\n                    <td class=\"aobo-f-col\">975-1100<\/td>\n                  <\/tr>\n                  <tr data-grade=\"m52\">\n                    <td class=\"aobo-grade-cell\">M52<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1120-1175<\/td>\n                    <td class=\"aobo-f-col\">2050-2150<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A, or S<\/td>\n                    <td class=\"aobo-c-col\">525-595<\/td>\n                    <td class=\"aobo-f-col\">975-1100<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Chromium Hot-Work Steels <span class=\"aobo-cat-badge\">5 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"h10\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/h10-tool-steel-heat-treatment-guide\/\">H10<\/a><\/td>\n                    <td>Moderately from preheat<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">1010-1040<\/td>\n                    <td class=\"aobo-f-col\">1850-1900<\/td>\n                    <td>15-40 (e)<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">540-650<\/td>\n                    <td class=\"aobo-f-col\">1000-1200<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h11, h12\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/h11-tool-steel-heat-treatment\/\">H11<\/a>, H12<\/td>\n                    <td>Moderately from preheat<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">995-1025<\/td>\n                    <td class=\"aobo-f-col\">1825-1875<\/td>\n                    <td>15-40 (e)<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">540-650<\/td>\n                    <td class=\"aobo-f-col\">1000-1200<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h13\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/h13-steel-heat-treatment\/\">H13<\/a><\/td>\n                    <td>Moderately from preheat<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">995-1040<\/td>\n                    <td class=\"aobo-f-col\">1825-1900<\/td>\n                    <td>15-40 (e)<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">540-650<\/td>\n                    <td class=\"aobo-f-col\">1000-1200<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h14\">\n                    <td class=\"aobo-grade-cell\">H14<\/td>\n                    <td>Moderately from preheat<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">1010-1065<\/td>\n                    <td class=\"aobo-f-col\">1850-1950<\/td>\n                    <td>15-40 (e)<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">540-650<\/td>\n                    <td class=\"aobo-f-col\">1000-1200<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h19\">\n                    <td class=\"aobo-grade-cell\">H19<\/td>\n                    <td>Moderately from preheat<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">1095-1205<\/td>\n                    <td class=\"aobo-f-col\">2000-2200<\/td>\n                    <td>2-5<\/td>\n                    <td>A or O<\/td>\n                    <td class=\"aobo-c-col\">540-705<\/td>\n                    <td class=\"aobo-f-col\">1000-1300<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Tungsten Hot-Work Steels <span class=\"aobo-cat-badge\">5 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"h21, h22\">\n                    <td class=\"aobo-grade-cell\">H21, H22<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">1095-1205<\/td>\n                    <td class=\"aobo-f-col\">2000-2200<\/td>\n                    <td>2-5<\/td>\n                    <td>A or O<\/td>\n                    <td class=\"aobo-c-col\">595-675<\/td>\n                    <td class=\"aobo-f-col\">1100-1250<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h23\">\n                    <td class=\"aobo-grade-cell\">H23<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">845<\/td>\n                    <td class=\"aobo-f-col\">1550<\/td>\n                    <td class=\"aobo-c-col\">1205-1260<\/td>\n                    <td class=\"aobo-f-col\">2200-2300<\/td>\n                    <td>2-5<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">650-815<\/td>\n                    <td class=\"aobo-f-col\">1200-1500<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h24\">\n                    <td class=\"aobo-grade-cell\">H24<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">1095-1230<\/td>\n                    <td class=\"aobo-f-col\">2000-2250<\/td>\n                    <td>2-5<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">565-650<\/td>\n                    <td class=\"aobo-f-col\">1050-1200<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h25\">\n                    <td class=\"aobo-grade-cell\">H25<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">1150-1260<\/td>\n                    <td class=\"aobo-f-col\">2100-2300<\/td>\n                    <td>2-5<\/td>\n                    <td>A or O<\/td>\n                    <td class=\"aobo-c-col\">565-675<\/td>\n                    <td class=\"aobo-f-col\">1050-1250<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h26\">\n                    <td class=\"aobo-grade-cell\">H26<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">870<\/td>\n                    <td class=\"aobo-f-col\">1600<\/td>\n                    <td class=\"aobo-c-col\">1175-1260<\/td>\n                    <td class=\"aobo-f-col\">2150-2300<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A or S<\/td>\n                    <td class=\"aobo-c-col\">565-675<\/td>\n                    <td class=\"aobo-f-col\">1050-1250<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Molybdenum Hot-Work Steels <span class=\"aobo-cat-badge\">2 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"h41, h43\">\n                    <td class=\"aobo-grade-cell\">H41, H43<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1095-1190<\/td>\n                    <td class=\"aobo-f-col\">2000-2175<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A or S<\/td>\n                    <td class=\"aobo-c-col\">565-650<\/td>\n                    <td class=\"aobo-f-col\">1050-1200<\/td>\n                  <\/tr>\n                  <tr data-grade=\"h42\">\n                    <td class=\"aobo-grade-cell\">H42<\/td>\n                    <td>Rapidly from preheat<\/td>\n                    <td class=\"aobo-c-col\">730-845<\/td>\n                    <td class=\"aobo-f-col\">1350-1550<\/td>\n                    <td class=\"aobo-c-col\">1120-1220<\/td>\n                    <td class=\"aobo-f-col\">2050-2225<\/td>\n                    <td>2-5<\/td>\n                    <td>O, A or S<\/td>\n                    <td class=\"aobo-c-col\">565-650<\/td>\n                    <td class=\"aobo-f-col\">1050-1200<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">High-Carbon, High-Chromium Cold-Work Steels <span class=\"aobo-cat-badge\">4 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"d1, d5\">\n                    <td class=\"aobo-grade-cell\">D1, D5<\/td>\n                    <td>Very slowly<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">980-1025<\/td>\n                    <td class=\"aobo-f-col\">1800-1875<\/td>\n                    <td>15-45<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">205-540<\/td>\n                    <td class=\"aobo-f-col\">400-1000<\/td>\n                  <\/tr>\n                  <tr data-grade=\"d3\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/d3-tool-steel-heat-treatment\/\">D3<\/a><\/td>\n                    <td>Very slowly<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">925-980<\/td>\n                    <td class=\"aobo-f-col\">1700-1800<\/td>\n                    <td>15-45<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">205-540<\/td>\n                    <td class=\"aobo-f-col\">400-1000<\/td>\n                  <\/tr>\n                  <tr data-grade=\"d4\">\n                    <td class=\"aobo-grade-cell\">D4<\/td>\n                    <td>Very slowly<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">970-1010<\/td>\n                    <td class=\"aobo-f-col\">1775-1850<\/td>\n                    <td>15-45<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">205-540<\/td>\n                    <td class=\"aobo-f-col\">400-1000<\/td>\n                  <\/tr>\n                  <tr data-grade=\"d7\">\n                    <td class=\"aobo-grade-cell\">D7<\/td>\n                    <td>Very slowly<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">1010-1065<\/td>\n                    <td class=\"aobo-f-col\">1850-1950<\/td>\n                    <td>30-60<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">150-540<\/td>\n                    <td class=\"aobo-f-col\">300-1000<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Medium-Alloy, Air-Hardening Cold-Work Steels <span class=\"aobo-cat-badge\">8 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"a2\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/a2-tool-steel-heat-treatment-guide\/\">A2<\/a><\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">790<\/td>\n                    <td class=\"aobo-f-col\">1450<\/td>\n                    <td class=\"aobo-c-col\">925-980<\/td>\n                    <td class=\"aobo-f-col\">1700-1800<\/td>\n                    <td>20-45<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">175-540<\/td>\n                    <td class=\"aobo-f-col\">350-1000<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a3\">\n                    <td class=\"aobo-grade-cell\">A3<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">790<\/td>\n                    <td class=\"aobo-f-col\">1450<\/td>\n                    <td class=\"aobo-c-col\">955-980<\/td>\n                    <td class=\"aobo-f-col\">1750-1800<\/td>\n                    <td>25-60<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">175-540<\/td>\n                    <td class=\"aobo-f-col\">350-1000<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a4\">\n                    <td class=\"aobo-grade-cell\">A4<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">675<\/td>\n                    <td class=\"aobo-f-col\">1250<\/td>\n                    <td class=\"aobo-c-col\">815-870<\/td>\n                    <td class=\"aobo-f-col\">1500-1600<\/td>\n                    <td>20-45<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">175-425<\/td>\n                    <td class=\"aobo-f-col\">350-800<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a6\">\n                    <td class=\"aobo-grade-cell\">A6<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">650<\/td>\n                    <td class=\"aobo-f-col\">1200<\/td>\n                    <td class=\"aobo-c-col\">830-870<\/td>\n                    <td class=\"aobo-f-col\">1525-1600<\/td>\n                    <td>20-45<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">150-425<\/td>\n                    <td class=\"aobo-f-col\">300-800<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a7\">\n                    <td class=\"aobo-grade-cell\">A7<\/td>\n                    <td>Very slowly<\/td>\n                    <td class=\"aobo-c-col\">815<\/td>\n                    <td class=\"aobo-f-col\">1500<\/td>\n                    <td class=\"aobo-c-col\">955-980<\/td>\n                    <td class=\"aobo-f-col\">1750-1800<\/td>\n                    <td>30-60<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">150-540<\/td>\n                    <td class=\"aobo-f-col\">300-1000<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a8\">\n                    <td class=\"aobo-grade-cell\">A8<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">790<\/td>\n                    <td class=\"aobo-f-col\">1450<\/td>\n                    <td class=\"aobo-c-col\">980-1010<\/td>\n                    <td class=\"aobo-f-col\">1800-1850<\/td>\n                    <td>20-45<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">175-595<\/td>\n                    <td class=\"aobo-f-col\">350-1100<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a9\">\n                    <td class=\"aobo-grade-cell\">A9<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">790<\/td>\n                    <td class=\"aobo-f-col\">1450<\/td>\n                    <td class=\"aobo-c-col\">980-1025<\/td>\n                    <td class=\"aobo-f-col\">1800-1875<\/td>\n                    <td>20-45<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">510-620<\/td>\n                    <td class=\"aobo-f-col\">950-1150<\/td>\n                  <\/tr>\n                  <tr data-grade=\"a10\">\n                    <td class=\"aobo-grade-cell\">A10<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">650<\/td>\n                    <td class=\"aobo-f-col\">1200<\/td>\n                    <td class=\"aobo-c-col\">790-815<\/td>\n                    <td class=\"aobo-f-col\">1450-1500<\/td>\n                    <td>30-60<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">175-425<\/td>\n                    <td class=\"aobo-f-col\">350-800<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Oil-Hardening Cold-Work Steels <span class=\"aobo-cat-badge\">4 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"o1\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/o1-tool-steel-heat-treatment\/\">O1<\/a><\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">650<\/td>\n                    <td class=\"aobo-f-col\">1200<\/td>\n                    <td class=\"aobo-c-col\">790-815<\/td>\n                    <td class=\"aobo-f-col\">1450-1500<\/td>\n                    <td>10-30<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">175-260<\/td>\n                    <td class=\"aobo-f-col\">350-500<\/td>\n                  <\/tr>\n                  <tr data-grade=\"o2\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/o2-tool-steel-heat-treatment\/\">O2<\/a><\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">650<\/td>\n                    <td class=\"aobo-f-col\">1200<\/td>\n                    <td class=\"aobo-c-col\">760-800<\/td>\n                    <td class=\"aobo-f-col\">1400-1475<\/td>\n                    <td>5-20<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">175-260<\/td>\n                    <td class=\"aobo-f-col\">350-500<\/td>\n                  <\/tr>\n                  <tr data-grade=\"o6\">\n                    <td class=\"aobo-grade-cell\">O6<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">790-815<\/td>\n                    <td class=\"aobo-f-col\">1450-1500<\/td>\n                    <td>10-30<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">175-315<\/td>\n                    <td class=\"aobo-f-col\">350-600<\/td>\n                  <\/tr>\n                  <tr data-grade=\"o7\">\n                    <td class=\"aobo-grade-cell\">O7<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">650<\/td>\n                    <td class=\"aobo-f-col\">1200<\/td>\n                    <td class=\"aobo-c-col\">W: 790-830 \/ O: 845-885<\/td>\n                    <td class=\"aobo-f-col\">W: 1450-1525 \/ O: 1550-1625<\/td>\n                    <td>10-30<\/td>\n                    <td>O or W<\/td>\n                    <td class=\"aobo-c-col\">175-290<\/td>\n                    <td class=\"aobo-f-col\">350-550<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Shock-Resisting Steels <span class=\"aobo-cat-badge\">4 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"s1\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/s1-tool-steel-heat-treatment-guide\/\">S1<\/a><\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">900-955<\/td>\n                    <td class=\"aobo-f-col\">1650-1750<\/td>\n                    <td>15-45<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">205-650<\/td>\n                    <td class=\"aobo-f-col\">400-1200<\/td>\n                  <\/tr>\n                  <tr data-grade=\"s2\">\n                    <td class=\"aobo-grade-cell\">S2<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">650 (f)<\/td>\n                    <td class=\"aobo-f-col\">1200 (f)<\/td>\n                    <td class=\"aobo-c-col\">845-900<\/td>\n                    <td class=\"aobo-f-col\">1550-1650<\/td>\n                    <td>5-20<\/td>\n                    <td>B or W<\/td>\n                    <td class=\"aobo-c-col\">175-425<\/td>\n                    <td class=\"aobo-f-col\">350-800<\/td>\n                  <\/tr>\n                  <tr data-grade=\"s5\">\n                    <td class=\"aobo-grade-cell\">S5<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">760<\/td>\n                    <td class=\"aobo-f-col\">1400<\/td>\n                    <td class=\"aobo-c-col\">870-925<\/td>\n                    <td class=\"aobo-f-col\">1600-1700<\/td>\n                    <td>5-20<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">175-425<\/td>\n                    <td class=\"aobo-f-col\">350-800<\/td>\n                  <\/tr>\n                  <tr data-grade=\"s7\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/s7-tool-steel-heat-treatment\/\">S7<\/a><\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">650-705<\/td>\n                    <td class=\"aobo-f-col\">1200-1300<\/td>\n                    <td class=\"aobo-c-col\">925-955<\/td>\n                    <td class=\"aobo-f-col\">1700-1750<\/td>\n                    <td>15-45<\/td>\n                    <td>A or O<\/td>\n                    <td class=\"aobo-c-col\">205-260<\/td>\n                    <td class=\"aobo-f-col\">400-500<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Mold Steels <span class=\"aobo-cat-badge\">7 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"p2\">\n                    <td class=\"aobo-grade-cell\">P2<\/td>\n                    <td><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">900-925 (g) \/ 830-845 (h)<\/td>\n                    <td class=\"aobo-f-col\">1650-1750 (g) \/ 1525-1550 (h)<\/td>\n                    <td>15<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">175-260<\/td>\n                    <td class=\"aobo-f-col\">350-500<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p3\">\n                    <td class=\"aobo-grade-cell\">P3<\/td>\n                    <td><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">900-925 (g) \/ 800-830 (h)<\/td>\n                    <td class=\"aobo-f-col\">1650-1700 (g) \/ 1475-1525 (h)<\/td>\n                    <td>15<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">175-260<\/td>\n                    <td class=\"aobo-f-col\">350-500<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p4\">\n                    <td class=\"aobo-grade-cell\">P4<\/td>\n                    <td><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">970-995 (g) \/ 970-995 (h)<\/td>\n                    <td class=\"aobo-f-col\">1775-1825 (g) \/ 1775-1825 (h)<\/td>\n                    <td>15<\/td>\n                    <td>A<\/td>\n                    <td class=\"aobo-c-col\">175-480<\/td>\n                    <td class=\"aobo-f-col\">350-900<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p5\">\n                    <td class=\"aobo-grade-cell\">P5<\/td>\n                    <td><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">900-925 (g) \/ 845-870 (h)<\/td>\n                    <td class=\"aobo-f-col\">1650-1700 (g) \/ 1550-1600 (h)<\/td>\n                    <td>15<\/td>\n                    <td>O or W<\/td>\n                    <td class=\"aobo-c-col\">175-260<\/td>\n                    <td class=\"aobo-f-col\">350-500<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p6\">\n                    <td class=\"aobo-grade-cell\">P6<\/td>\n                    <td><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">900-925 (g) \/ 790-815 (h)<\/td>\n                    <td class=\"aobo-f-col\">1650-1700 (g) \/ 1450-1500 (h)<\/td>\n                    <td>15<\/td>\n                    <td>A or O<\/td>\n                    <td class=\"aobo-c-col\">175-230<\/td>\n                    <td class=\"aobo-f-col\">350-450<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p20\">\n                    <td class=\"aobo-grade-cell\">P20<\/td>\n                    <td><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">870-900 (h) \/ 815-870<\/td>\n                    <td class=\"aobo-f-col\">1600-1650 (h) \/ 1500-1600<\/td>\n                    <td>15<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">480-595 (i)<\/td>\n                    <td class=\"aobo-f-col\">900-1100 (i)<\/td>\n                  <\/tr>\n                  <tr data-grade=\"p21 (j)\">\n                    <td class=\"aobo-grade-cell\">P21 (j)<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-no\">Do not preheat<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">705-730<\/td>\n                    <td class=\"aobo-f-col\">1300-1350<\/td>\n                    <td>60-180<\/td>\n                    <td>A or O<\/td>\n                    <td class=\"aobo-c-col\">510-550<\/td>\n                    <td class=\"aobo-f-col\">950-1025<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Low-Alloy Special-Purpose Steels <span class=\"aobo-cat-badge\">3 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"l2\">\n                    <td class=\"aobo-grade-cell\">L2<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">W: 790-845 \/ O: 845-925<\/td>\n                    <td class=\"aobo-f-col\">W: 1450-1550 \/ O: 1550-1700<\/td>\n                    <td>10-30<\/td>\n                    <td>O or W<\/td>\n                    <td class=\"aobo-c-col\">175-540<\/td>\n                    <td class=\"aobo-f-col\">350-1000<\/td>\n                  <\/tr>\n                  <tr data-grade=\"l3\">\n                    <td class=\"aobo-grade-cell\">L3<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">W: 775-815 \/ O: 815-870<\/td>\n                    <td class=\"aobo-f-col\">W: 1425-1500 \/ O: 1500-1600<\/td>\n                    <td>10-30<\/td>\n                    <td>O or W<\/td>\n                    <td class=\"aobo-c-col\">175-315<\/td>\n                    <td class=\"aobo-f-col\">350-600<\/td>\n                  <\/tr>\n                  <tr data-grade=\"l6\">\n                    <td class=\"aobo-grade-cell\"><a href=\"https:\/\/aobosteel.com\/l6-tool-steel-heat-treatment\/\">L6<\/a><\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-f-col\"><span class=\"aobo-dash\">\u2014<\/span><\/td>\n                    <td class=\"aobo-c-col\">790-845<\/td>\n                    <td class=\"aobo-f-col\">1450-1550<\/td>\n                    <td>10-30<\/td>\n                    <td>O<\/td>\n                    <td class=\"aobo-c-col\">175-540<\/td>\n                    <td class=\"aobo-f-col\">350-1000<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Carbon-Tungsten Special-Purpose Steels <span class=\"aobo-cat-badge\">1 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"f1, f2\">\n                    <td class=\"aobo-grade-cell\">F1, F2<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">650<\/td>\n                    <td class=\"aobo-f-col\">1200<\/td>\n                    <td class=\"aobo-c-col\">790-870<\/td>\n                    <td class=\"aobo-f-col\">1450-1600<\/td>\n                    <td>15<\/td>\n                    <td>W or B<\/td>\n                    <td class=\"aobo-c-col\">175-260<\/td>\n                    <td class=\"aobo-f-col\">350-500<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <details class=\"aobo-cat-section\">\n            <summary class=\"aobo-cat-header\">\n              <span class=\"aobo-cat-title\">Water-Hardening Steels <span class=\"aobo-cat-badge\">1 grades<\/span><\/span>\n              <span class=\"aobo-cat-toggle\">\u25be<\/span>\n            <\/summary>\n            <div class=\"aobo-cat-body\">\n              <table class=\"aobo-ht-table\">\n                <thead><tr>\n                  <th scope=\"col\">Type<\/th>\n                  <th scope=\"col\">Rate of heating<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Preheat \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Preheat \u00b0F<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Hardening \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Hardening \u00b0F<\/th>\n                  <th scope=\"col\">Time, min<\/th>\n                  <th scope=\"col\">Quench (a)<\/th>\n                  <th scope=\"col\" class=\"aobo-c-col\">Tempering \u00b0C<\/th>\n                  <th scope=\"col\" class=\"aobo-f-col\">Tempering \u00b0F<\/th>\n                <\/tr><\/thead>\n                <tbody>\n                  <tr data-grade=\"w1, w2, w3\">\n                    <td class=\"aobo-grade-cell\">W1, W2, W3<\/td>\n                    <td>Slowly<\/td>\n                    <td class=\"aobo-c-col\">565-650 (k)<\/td>\n                    <td class=\"aobo-f-col\">1050-1200 (k)<\/td>\n                    <td class=\"aobo-c-col\">760-845<\/td>\n                    <td class=\"aobo-f-col\">1400-1550<\/td>\n                    <td>10-30<\/td>\n                    <td>B or W<\/td>\n                    <td class=\"aobo-c-col\">175-345<\/td>\n                    <td class=\"aobo-f-col\">350-650<\/td>\n                  <\/tr>\n                <\/tbody>\n              <\/table>\n            <\/div>\n          <\/details>\n          <div class=\"aobo-footnotes\">\n            <h3>Notes &amp; References<\/h3>\n            <ol>\n              <li>(a) O, oil quench; A, air cool; S, salt bath quench; W, water quench; B, brine quench.<\/li>\n              <li>(b) When the high-temperature heating is carried out in a salt bath, the range of temperatures should be about 14 \u00b0C (25 \u00b0F) lower than given here.<\/li>\n              <li>(c) Double tempering recommended for not less than 1 h at temperature each time.<\/li>\n              <li>(d) Triple tempering recommended for not less than 1 h at temperature each time.<\/li>\n              <li>(e) Times apply to open furnace heat treatment. For pack hardening, a common rule is to heat 1.2 min per mm (30 min per in.) of cross section of the pack.<\/li>\n              <li>(f) Preferable for large tools to minimize decarburization.<\/li>\n              <li>(g) Carburizing temperature.<\/li>\n              <li>(h) After carburizing.<\/li>\n              <li>(i) Carburized per case hardness.<\/li>\n              <li>(j) P21 is a precipitation-hardening steel having a thermal treatment that involves solution treating and aging rather than hardening and tempering.<\/li>\n              <li>(k) Recommended for large tools and tools with intricate sections.<\/li>\n            <\/ol>\n          <\/div>\n        <\/div>\n\n        <!-- Disclaimer -->\n        <div class=\"aobo-disclaimer\">\n          <h3>Supply Scope &amp; Technical Reference Note<\/h3>\n          <p>Aobo Steel supplies tool steel in an <a href=\"https:\/\/aobosteel.com\/tool-steel-annealed-condition\/\">annealed condition<\/a> and does not provide final heat-treatment services such as hardening, quenching, cryogenic treatment, or tempering.<\/p>\n          <p>The heat treatment parameters, hardness data, and process recommendations in this reference are provided as general technical support for our customers. Actual heat-treatment results may vary depending on furnace capacity, section size, tool geometry, material condition, quenching practice, and process control. Final heat-treatment procedures and validation should be performed by the customer&#8217;s heat-treatment facility in accordance with the specific tooling application and production requirements.<\/p>\n        <\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"aobo-related\">\n      <h3>Related reference pages<\/h3>\n      <p><a href=\"https:\/\/aobosteel.com\/tool-steel-properties-chart\/\">Tool steel properties chart<\/a> &middot; <a href=\"https:\/\/aobosteel.com\/tool-steel-hot-hardness-chart\/\">Hot hardness chart<\/a> &middot; <a href=\"https:\/\/aobosteel.com\/tool-steel-forging-temperature-guide\/\">Forging temperature guide<\/a> &middot; <a href=\"https:\/\/aobosteel.com\/steel-heat-color-chart\/\">Heat color chart<\/a> &middot; <a href=\"https:\/\/aobosteel.com\/tool-steel-hardness-conversion-calculator\/\">Hardness conversion calculator<\/a> &middot; <a href=\"https:\/\/aobosteel.com\/tool-steel-material-finder\/\">Tool steel material finder<\/a> &middot; <a href=\"https:\/\/aobosteel.com\/tool-steel-size-change-in-heat-treatment\/\">Tool steel size change in heat treatment<\/a><\/p>\n    <\/div>\n\n    <p class=\"aobo-source\">Data source: ASM Handbook, Wrought Tool Steels (revised by Alan M. Bayer, Teledyne Vasco, and Lee R. Walton, Latrobe Steel Company). Tables 8 &amp; 9. Data compiled from public references and industry standards.<\/p>\n  <\/div>\n<\/section>\n\n<script>\n\/* Progressive enhancement for the grade search box and Reset button.\n   Tabs, unit toggle and the category collapse are pure CSS and work without this. *\/\n(function () {\n  var root = document.getElementById('aoboHtRef');\n  if (!root) return;\n  var searchInput = document.getElementById('aoboSearchInput');\n  var resetBtn = document.getElementById('aoboResetBtn');\n  var noResultsEl = document.getElementById('aoboNoResults');\n  var tab8 = document.getElementById('aoboHtTab8');\n  var tab9 = document.getElementById('aoboHtTab9');\n  var panels = [document.getElementById('aoboPanel8'), document.getElementById('aoboPanel9')];\n\n  function sections(panel) { return panel.querySelectorAll('.aobo-cat-section'); }\n\n  function collapseExceptFirst(panel) {\n    sections(panel).forEach(function (s, i) { s.open = (i === 0); });\n  }\n\n  function applySearch() {\n    var term = searchInput.value.trim().toLowerCase();\n    var hits = [];\n    panels.forEach(function (panel) {\n      var n = 0;\n      panel.querySelectorAll('tbody tr').forEach(function (row) {\n        var grade = row.getAttribute('data-grade') || '';\n        var hit = !term || grade.indexOf(term) !== -1;\n        row.classList.toggle('aobo-no-match', !hit);\n        row.classList.toggle('aobo-match', !!term && hit);\n        if (term && hit) n++;\n      });\n      hits.push(n);\n      sections(panel).forEach(function (s) { s.open = true; });\n    });\n\n    if (!term) {\n      noResultsEl.style.display = 'none';\n      panels.forEach(collapseExceptFirst);\n      return;\n    }\n    \/* keep the visitor on the tab that actually holds the match *\/\n    if (hits[0] === 0 && hits[1] > 0) tab9.checked = true;\n    else if (hits[0] > 0 && hits[1] === 0) tab8.checked = true;\n    noResultsEl.style.display = (hits[0] + hits[1] === 0) ? 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The quench and temper schedule is also published as a standalone table in [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":17168,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"normal-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-17163","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Tool Steel Annealing &amp; Normalizing Temperature Chart - AoboSteel<\/title>\n<meta name=\"description\" content=\"Find recommended annealing and normalizing temperatures for AISI, DIN, and JIS tool steels, including D2, H13, A2, O1, P20, M2, W1, and more. 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Search by grade name, toggle between \u00b0C and \u00b0F, and expand each category group for full specification data. The quench and temper schedule is also published as a standalone table in&hellip;","_links":{"self":[{"href":"https:\/\/aobosteel.com\/ko\/wp-json\/wp\/v2\/pages\/17163","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aobosteel.com\/ko\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/aobosteel.com\/ko\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/aobosteel.com\/ko\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aobosteel.com\/ko\/wp-json\/wp\/v2\/comments?post=17163"}],"version-history":[{"count":9,"href":"https:\/\/aobosteel.com\/ko\/wp-json\/wp\/v2\/pages\/17163\/revisions"}],"predecessor-version":[{"id":18316,"href":"https:\/\/aobosteel.com\/ko\/wp-json\/wp\/v2\/pages\/17163\/revisions\/18316"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aobosteel.com\/ko\/wp-json\/wp\/v2\/media\/17168"}],"wp:attachment":[{"href":"https:\/\/aobosteel.com\/ko\/wp-json\/wp\/v2\/media?parent=17163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}