{"id":11673,"date":"2025-12-23T12:52:18","date_gmt":"2025-12-23T04:52:18","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=11673"},"modified":"2026-09-26T21:13:47","modified_gmt":"2026-09-26T13:13:47","slug":"s7-tool-steel-heat-treatment","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/es\/s7-tool-steel-heat-treatment\/","title":{"rendered":"Gu\u00eda de tratamiento t\u00e9rmico del acero para herramientas S7: temperatura, dureza y proceso."},"content":{"rendered":"\n<section class=\"aobo-s7-heat-treatment-page\">\n  <style>\n    .aobo-s7-heat-treatment-page {\n      --aobo-blue: #0c56d0;\n      --aobo-blue-dark: #073b8e;\n      --aobo-blue-soft: #eaf2ff;\n      --aobo-border: #d7e5fb;\n      --aobo-text: #203044;\n      --aobo-muted: #617087;\n      --aobo-orange: #f59b23;\n      --aobo-shadow: 0 18px 45px rgba(12, 86, 208, 0.10);\n      font-family: inherit;\n      color: var(--aobo-text);\n      line-height: 1.7;\n      background: transparent;\n      padding: 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1;\n      background: #f7fbff;\n      border: 1px solid var(--aobo-border);\n      border-radius: 18px;\n      overflow: hidden;\n    }\n\n    .aobo-supply-image img {\n      display: block;\n      width: 100%;\n      height: 100%;\n      object-fit: cover;\n    }\n\n    .aobo-supply-content {\n      display: flex;\n      flex-direction: column;\n      justify-content: center;\n      padding: 0;\n    }\n\n    .aobo-supply-content p {\n      margin: 0;\n      font-size: 17px;\n      color: var(--aobo-text);\n    }\n\n    .aobo-supply-actions {\n      display: flex;\n      flex-wrap: wrap;\n      gap: 12px;\n      margin-top: 18px;\n    }\n\n    .aobo-supply-actions .aobo-btn {\n      min-width: 190px;\n    }\n\n    .aobo-article {\n      max-width: 1180px;\n      margin: 0 auto;\n    }\n\n    .aobo-article h2 {\n      margin: 44px 0 16px;\n      color: #082d6f;\n      font-size: 30px;\n      line-height: 1.25;\n    }\n\n    .aobo-article h3 {\n      margin: 30px 0 12px;\n      color: 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class=\"aobo-hero\">\n      <h1 style=\"--h1-max:50px\">S7 Tool Steel Heat Treatment Guide<\/h1>\n      <p>S7 tool steel is typically <a href=\"https:\/\/aobosteel.com\/tool-steel-heat-treatment-guide\/\">heat-treated<\/a> by preheating to 1200\u20131250\u00b0F (649\u2013677\u00b0C), austenitizing at about 1725\u00b0F (940\u00b0C), air quenching for sections up to about 2.5 in. (63.5 mm), and applying immediate double tempering. For most cold-work tooling, S7 is commonly tempered at 400\u2013500\u00b0F (204\u2013260\u00b0C), producing a typical working hardness of about 56\u201358 HRC.<\/p>\n    <\/header>\n\n    <section class=\"aobo-supply-block\">\n      <div class=\"aobo-supply-image\">\n        <img decoding=\"async\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2025\/04\/S7.webp\" alt=\"S7 tool steel bar stock supplied by Aobo Steel\" loading=\"lazy\">\n      <\/div>\n      <div class=\"aobo-supply-content\">\n        <p>Aobo Steel supplies S7 tool steel in the annealed condition, ready for your machining and in-house heat treatment. Check the available sizes and stock, or send your requirement for a quote. Size range, tolerances, minimum order and lead times are set out on our <a href=\"https:\/\/aobosteel.com\/tool-steel-supplier-bulk-capability\/\">tool steel supply capability page<\/a>.<\/p>\n        <div class=\"aobo-supply-actions\">\n          <a class=\"aobo-btn aobo-btn-primary popmake-16052\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n          <a class=\"aobo-btn aobo-btn-secondary\" href=\"https:\/\/aobosteel.com\/s7-tool-steel\/\">View S7 Supply Details<\/a>\n        <\/div>\n      <\/div>\n    <\/section>\n\n    <main class=\"aobo-article\">\n      <h2>S7 Tool Steel Heat Treatment Quick Guide<\/h2>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Process Phase<\/th><th>Temperature<\/th><th>Soak Time<\/th><th>Cooling Method<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Annealing<\/td><td>815\u2013870 \u00b0C<\/td><td>1\u20131.5 hr\/in<\/td><td>Furnace cool to 482 \u00b0C, then air cool<\/td><\/tr>\n            <tr><td>Stress Relieving<\/td><td>649\u2013677 \u00b0C<\/td><td>1\u20132 hr\/in<\/td><td>Furnace cool preferred<\/td><\/tr>\n            <tr><td>Preheating<\/td><td>649\u2013704 \u00b0C<\/td><td>Until uniform<\/td><td>\u2014<\/td><\/tr>\n            <tr><td>Austenitizing<\/td><td>940\u2013982 \u00b0C<\/td><td>Controlled by section size<\/td><td>Air or oil depending on section size<\/td><\/tr>\n            <tr><td>Quenching<\/td><td>\u2014<\/td><td>\u2014<\/td><td>Air \u226463.5 mm; oil or flash oil &gt;63.5 mm<\/td><\/tr>\n            <tr><td>Tempering<\/td><td>204\u2013538 \u00b0C<\/td><td>2 hr\/in, twice<\/td><td>Air cool between cycles<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n        <div class=\"ts-dl\">\n          <div class=\"ts-dl-txt\"><strong>S7 Tool Steel Heat Treatment Work Card, printable PDF<\/strong>\n          Two A4 pages with the process phases, soak times, tempering chart, quenching options and troubleshooting, plus our contact details.<\/div>\n          <a class=\"ts-dl-btn\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/09\/Aobo-Steel-S7-Heat-Treatment-Work-Card.pdf\" download>\n            <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m0 0 4.5-4.5M12 15l-4.5-4.5M4 20h16\"\/><\/svg>\n            Download PDF, 418 KB\n          <\/a>\n        <\/div>\n\n      <p>Section size strongly affects the quenching method and final hardness. Thin and medium sections can normally achieve full hardness by air cooling, while heavier sections may require faster cooling to avoid low core hardness.<\/p>\n\n      <h2>Step-by-Step S7 Tool Steel Heat Treatment Process<\/h2>\n      <h3>1. Preheating<\/h3>\n      <p>Protect S7 tool steel from decarburization during heating. Use a controlled-atmosphere furnace, a vacuum furnace, a neutral salt bath, or sealed stainless-steel foil.<\/p>\n      <p>Heat uniformly to 1200\u20131250 \u00b0F (649\u2013677 \u00b0C) and hold until the entire cross-section reaches the temperature. For small sections, a 10\u201315 minute soak after temperature equalization is usually sufficient.<\/p>\n      <p>Preheating reduces thermal shock, improves temperature uniformity, and lowers the risk of cracking during the final rise to austenitizing temperature.<\/p>\n\n      <h3>2. Austenitizing<\/h3>\n      <p>Raise the temperature to about 1725 \u00b0F (940 \u00b0C). Timing should begin only after the part has reached its full temperature.<\/p>\n      <p>Soak time must be controlled carefully. Excessive temperature or soaking can cause grain coarsening, retained austenite, lower toughness, and dimensional instability.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Section Thickness<\/th><th>Recommended Soak Time<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>1\/8 in. \/ 3.2 mm<\/td><td>30 min<\/td><\/tr>\n            <tr><td>1\/4 in. \/ 6.4 mm<\/td><td>40 min<\/td><\/tr>\n            <tr><td>1\/2 in. \/ 12.7 mm<\/td><td>45\u201350 min<\/td><\/tr>\n            <tr><td>3\/4 in. \/ 19 mm<\/td><td>50\u201355 min<\/td><\/tr>\n            <tr><td>\u22651 in. \/ 25 mm<\/td><td>About 1 hr\/in<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <h3>3. Quenching<\/h3>\n      <p>For sections up to 2.5 in. (about 63.5 mm), use still-air cooling. Cool the part to approximately 150 \u00b0F (65 \u00b0C) before tempering.<\/p>\n      <p>For sections above 2.5 in., use a faster cooling method. A flash oil quench is commonly used: immerse and agitate until the <a href=\"https:\/\/aobosteel.com\/steel-heat-color-chart\/\">visible red heat<\/a> disappears, then remove the part and air cool to about 150 \u00b0F.<\/p>\n      <p>Air quenching provides better dimensional control, while oil-based cooling helps larger sections achieve sufficient hardness throughout the cross-section.<\/p>\n\n      <h3>4. Tempering<\/h3>\n      <p>Begin tempering immediately when the part cools to about 150 \u00b0F (65 \u00b0C).<\/p>\n      <p>S7 requires double tempering. Each tempering cycle should be held for 2 hours per inch of section thickness, followed by full air cooling to room temperature before the second cycle.<\/p>\n      <p>For most <a href=\"https:\/\/aobosteel.com\/cold-work-tool-steels\/\">cold-work tooling<\/a>, temper at 400\u2013500 \u00b0F (204\u2013260 \u00b0C). This typically produces a working hardness around 56\u201358 HRC.<\/p>\n      <p>For hot-work or elevated-temperature applications, temper at 900\u20131000 \u00b0F (482\u2013538 \u00b0C) to improve thermal stability.<\/p>\n      <p>Low-temperature tempering below 400 \u00b0F may increase hardness but also increases the risk of brittleness and is not recommended for standard industrial applications unless maximum hardness is the primary priority and any loss of toughness is acceptable.<\/p>\n\n      <h2>S7 Tool Steel Annealing and Stress Relieving<\/h2>\n      <h3>1. Annealing<\/h3>\n      <p>We supply S7 tool steel in the annealed condition. Re-annealing is usually required only when restoring machinability after hardening or when reworking tools.<\/p>\n      <p>Annealing should be performed in a controlled atmosphere, vacuum furnace, or neutral-salt environment to prevent decarburization.<\/p>\n      <p>Recommended annealing practice:<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Item<\/th><th>Recommendation<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Temperature<\/td><td>815\u2013870 \u00b0C, typically around 843 \u00b0C<\/td><\/tr>\n            <tr><td>Soak time<\/td><td>About 1.5 hr\/in<\/td><\/tr>\n            <tr><td>Cooling<\/td><td>Furnace cool at \u226414 \u00b0C\/hr to 482 \u00b0C, then air cool<\/td><\/tr>\n            <tr><td>Final hardness<\/td><td>Normally not above about 230 HB<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>Proper annealing improves machinability and prepares the steel for subsequent hardening.<\/p>\n\n      <h3>2. Stress Relieving<\/h3>\n      <p>Stress relieving is recommended after heavy rough machining, EDM, welding, or when working with complex geometries and uneven sections.<\/p>\n      <p>It is not mandatory for every part, but it becomes important when residual stress may cause distortion or cracking during hardening.<\/p>\n      <p>Recommended stress-relieving practice:<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Item<\/th><th>Recommendation<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Temperature<\/td><td>649\u2013677 \u00b0C<\/td><\/tr>\n            <tr><td>Soak time<\/td><td>1\u20132 hr\/in<\/td><\/tr>\n            <tr><td>Cooling<\/td><td>Furnace cooling preferred<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>Uniform cooling is important. Uneven cooling can introduce new thermal stresses and reduce the benefit of stress relieving.<\/p>\n\n      <h2>S7 Tool Steel Hardness After Heat Treatment<\/h2>\n      <p>The final hardness of S7 tool steel depends mainly on the austenitizing temperature, quenching method, section size, and tempering temperature. Because S7 is selected for shock resistance, heat treatment should not focus only on maximum hardness. The practical target is a stable balance between <a href=\"https:\/\/aobosteel.com\/s7-tool-steel-rockwell-hardness-chart\/\">Rockwell hardness<\/a>, toughness, and resistance to cracking.<\/p>\n      <p>After proper hardening, S7 can reach about 58\u201364 HRC in the as-quenched condition. However, as-quenched S7 is too brittle for normal tooling use and should be tempered immediately after quenching. For most cold-work tooling, the typical working hardness after tempering is about 56\u201358 HRC.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Tempering Temperature<\/th><th>Approximate Hardness<\/th><th class=\"ds-text\">Practical Meaning<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>As-quenched, before tempering<\/td><td>58\u201364 HRC<\/td><td class=\"ds-text\">Maximum hardness, but too brittle for service. Temper immediately after quenching.<\/td><\/tr>\n            <tr><td>400\u2013500 \u00b0F \/ 204\u2013260 \u00b0C<\/td><td>56\u201358 HRC<\/td><td class=\"ds-text\">Common cold-work range for punches, dies, shear blades, and shock-loaded tools.<\/td><\/tr>\n            <tr><td>Around 450 \u00b0F \/ 230 \u00b0C<\/td><td>About 58 HRC<\/td><td class=\"ds-text\">Practical general-purpose range when both wear resistance and impact toughness are required.<\/td><\/tr>\n            <tr><td>500\u2013900 \u00b0F \/ 260\u2013482 \u00b0C<\/td><td>About 54\u201356 HRC<\/td><td class=\"ds-text\">Stable hardness range with better toughness than lower tempering temperatures.<\/td><\/tr>\n            <tr><td>900\u20131000 \u00b0F \/ 482\u2013538 \u00b0C<\/td><td>About 48\u201352 HRC<\/td><td class=\"ds-text\">Used for hot-work or elevated-temperature applications where thermal stability is more important than maximum hardness.<\/td><\/tr>\n            <tr><td>1050\u20131150 \u00b0F \/ 565\u2013620 \u00b0C<\/td><td>About 45 HRC<\/td><td class=\"ds-text\">High tempering range with significant softening. Used only when lower hardness is acceptable.<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n        <div class=\"ts-dl\">\n          <div class=\"ts-dl-txt\"><strong>S7 Tool Steel Heat Treatment Work Card, printable PDF<\/strong>\n          Two A4 pages with the process phases, soak times, tempering chart, quenching options and troubleshooting, plus our contact details.<\/div>\n          <a class=\"ts-dl-btn\" href=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/09\/Aobo-Steel-S7-Heat-Treatment-Work-Card.pdf\" download>\n            <svg viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M12 3v12m0 0 4.5-4.5M12 15l-4.5-4.5M4 20h16\"\/><\/svg>\n            Download PDF, 418 KB\n          <\/a>\n        <\/div>\n\n      <p>For cold-work applications, S7 is commonly tempered at 400\u2013500 \u00b0F to reach about 56\u201358 HRC. This range is suitable when the tool must resist impact, chipping, and moderate wear simultaneously.<\/p>\n      <p>For hot-work or elevated-temperature service, S7 is usually tempered at 900\u20131000 \u00b0F. The hardness is lower, but the steel is better suited for applications where thermal stability and resistance to softening are more important than maximum Rockwell hardness.<\/p>\n      <p>Tempering below 400 \u00b0F is usually not recommended for standard industrial tooling. It may maintain higher hardness, but it also increases the risk of brittleness and cracking. S7 tools should also be double-tempered, with full cooling to room temperature between tempering cycles, to reduce internal stresses and improve the reliability of the final hardness.<\/p>\n      <p>The correct hardness should always be selected according to the tool\u2019s failure mode. If wear is the main problem, the lower tempering range may be suitable. If cracking, chipping, or impact failure is the main problem, a slightly lower hardness with better toughness is usually safer than chasing maximum hardness.<\/p>\n\n      <h2>S7 Tool Steel Heat Treatment by Application<\/h2>\n      <p>S7 heat treatment should be adjusted according to the tool\u2019s working condition. The main variable is usually the <a href=\"https:\/\/aobosteel.com\/tool-steel-tempering-chart\/\">tempering temperature<\/a>.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Application<\/th><th>Tempering Range<\/th><th>Typical Hardness<\/th><th>Main Priority<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Cold-work tooling, dies, punches, shear blades<\/td><td>400\u2013500 \u00b0F \/ 204\u2013260 \u00b0C<\/td><td>56\u201358 HRC<\/td><td>Wear and toughness balance<\/td><\/tr>\n            <tr><td>Cold-work tooling with maximum hardness focus<\/td><td>345\u2013400 \u00b0F \/ 175\u2013204 \u00b0C<\/td><td>Higher hardness<\/td><td>Maximum wear resistance, lower toughness<\/td><\/tr>\n            <tr><td>Hot-work or plastic molding tools<\/td><td>900\u20131000 \u00b0F \/ 482\u2013538 \u00b0C<\/td><td>48\u201352 HRC<\/td><td>Thermal stability<\/td><\/tr>\n            <tr><td>Shock-dominant tools<\/td><td>700\u2013750 \u00b0F \/ 370\u2013400 \u00b0C<\/td><td>Moderate hardness<\/td><td>Fracture resistance<\/td><\/tr>\n            <tr><td>Strength and toughness balance<\/td><td>Around 575 \u00b0F \/ 300 \u00b0C<\/td><td>Controlled hardness<\/td><td>Yield strength and impact balance<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>For standard cold-work applications, 450 \u00b0F (about 230 \u00b0C) is commonly used to achieve stable hardness and good impact resistance.<\/p>\n      <p>For elevated-temperature service, the tempering temperature should normally be at least 25\u201350 \u00b0F above the expected service temperature. This helps prevent softening during use.<\/p>\n      <p>For shock-dominant tooling, higher tempering temperatures are often more suitable because toughness and fracture resistance are more important than maximum hardness.<\/p>\n\n      <h2>S7 Tool Steel Quenching Method Selection<\/h2>\n      <p>The correct quenching method depends mainly on section size, geometry, and distortion sensitivity.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Condition<\/th><th>Method<\/th><th class=\"ds-text\">Key Process<\/th><th>Critical Note<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Sections \u226463.5 mm<\/td><td>Air quench<\/td><td class=\"ds-text\">Cool in still air after austenitizing<\/td><td>Best dimensional stability<\/td><\/tr>\n            <tr><td>Sections &gt;63.5 mm<\/td><td>Oil-based cooling<\/td><td class=\"ds-text\">Use faster cooling to improve core hardness<\/td><td>Air cooling may be insufficient<\/td><\/tr>\n            <tr><td>Heavy sections requiring stress control<\/td><td>Flash oil quench<\/td><td class=\"ds-text\">Oil quench until red heat disappears, then air cool<\/td><td>Do not use stainless steel foil<\/td><\/tr>\n            <tr><td>Complex or distortion-sensitive parts<\/td><td>Martempering<\/td><td class=\"ds-text\">Salt bath at 595\u2013650 \u00b0C, equalize, then air cool<\/td><td>Reduces thermal gradients<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>For many S7 tools, air quenching is preferred because it reduces the risk of distortion. However, for large sections, air cooling alone may not provide sufficient cooling rate to achieve full hardness.<\/p>\n      <figure class=\"aobo-figure\">\n        <img decoding=\"async\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/06\/S7-IT.avif\" alt=\"S7 tool steel heat treatment chart from Heat Treater\u2019s Guide\" loading=\"lazy\">\n        <figcaption>Source: Heat Treater\u2019s Guide: Practices and Procedures for Irons and Steels, ASM International, 1995, p. 532.<\/figcaption>\n      <\/figure>\n\n      <h2>Common S7 Tool Steel Heat Treatment Problems<\/h2>\n      <p>Most S7 <a href=\"https:\/\/aobosteel.com\/tool-steel-heat-treatment-troubleshooting-chart\/\">heat treatment failures<\/a> are linked to atmosphere control, section size, residual stress, excessive temperature, or delayed tempering.<\/p>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead><tr><th>Problem<\/th><th class=\"ds-text\">Root Cause<\/th><th class=\"ds-text\">Corrective Action<\/th><\/tr><\/thead>\n          <tbody>\n            <tr><td>Decarburization<\/td><td class=\"ds-text\">Surface carbon loss in an oxidizing atmosphere<\/td><td class=\"ds-text\">Use vacuum, controlled atmosphere, neutral salt, or sealed foil<\/td><\/tr>\n            <tr><td>Distortion or thermal cracking<\/td><td class=\"ds-text\">Thermal gradients, sharp geometry, or machining stress<\/td><td class=\"ds-text\">Preheat properly, stress relieve before hardening, avoid sharp corners<\/td><\/tr>\n            <tr><td>Low hardness in large sections<\/td><td class=\"ds-text\">Cooling rate too slow through the section<\/td><td class=\"ds-text\">Use oil-based cooling or flash oil quenching for heavier sections<\/td><\/tr>\n            <tr><td>Overheating or retained austenite<\/td><td class=\"ds-text\">Excessive austenitizing temperature or soak time<\/td><td class=\"ds-text\">Control temperature and soaking time strictly<\/td><\/tr>\n            <tr><td>Cracking after quenching<\/td><td class=\"ds-text\">Delayed tempering or excessive internal stress<\/td><td class=\"ds-text\">Temper immediately and apply double tempering<\/td><\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n      <p>Decarburization creates a soft surface layer that cannot fully harden, thereby reducing wear resistance. Overheating increases the risk of retained austenite, grain coarsening, dimensional instability, and lower toughness. Delayed tempering is especially dangerous because the as-quenched structure contains high internal stress.<\/p>\n\n      <div class=\"aobo-note-box\">\n        <p>Note: We do not provide S7 heat treatment services. Aobo Steel supplies S7 tool steel in the annealed condition, and this guide is provided as a technical reference to support our customers\u2019 processing and application decisions.<\/p>\n      <\/div>\n    <\/main>\n\n    <section class=\"aobo-final-cta\">\n      <div>\n        <h2>Need S7 Tool Steel for Shock-Resistant Tooling?<\/h2>\n        <p>Aobo Steel supplies S7 tool steel in annealed condition for industrial tooling applications. Send your required size, quantity, tolerance, and application for a quote.<\/p>\n      <\/div>\n      <a class=\"aobo-btn popmake-16052\" href=\"javascript:void(0);\">Send Inquiry<\/a>\n    <\/section>\n  <\/div>\n<\/section>\n\n\n","protected":false},"excerpt":{"rendered":"<p>S7 Tool Steel Heat Treatment Guide S7 tool steel is typically heat-treated by preheating to 1200\u20131250\u00b0F (649\u2013677\u00b0C), austenitizing at about 1725\u00b0F (940\u00b0C), air quenching for sections up to about 2.5 in. (63.5 mm), and applying immediate double tempering. For most cold-work tooling, S7 is commonly tempered at 400\u2013500\u00b0F (204\u2013260\u00b0C), producing a typical working hardness of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15089,"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-11673","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.6 (Yoast SEO v28.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>S7 Tool Steel Heat Treatment Guide: Temperature, Hardness &amp; 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(63.5 mm), and applying immediate double tempering. 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