{"id":15986,"date":"2026-06-22T10:26:38","date_gmt":"2026-06-22T02:26:38","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=15986"},"modified":"2026-06-25T15:59:36","modified_gmt":"2026-06-25T07:59:36","slug":"what-is-tool-steel","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/what-is-tool-steel\/","title":{"rendered":"What Is Tool Steel? Types, Grades and Uses"},"content":{"rendered":"<section class=\"aobo-tool-steel-page\">\n  <style>\n    .aobo-tool-steel-page {\n      --aobo-blue: #0c56d0;\n      --aobo-blue-dark: #073b8e;\n      --aobo-blue-soft: #eaf2ff;\n      --aobo-blue-line: #c9dcff;\n      --aobo-border: #d7e5fb;\n      --aobo-text: #203044;\n      --aobo-muted: #617087;\n      --aobo-orange: #f59b23;\n      --aobo-white: #ffffff;\n      --aobo-shadow: 0 18px 45px rgba(12, 86, 208, 0.10);\n      --aobo-page-width: 1180px;\n      --aobo-copy-width: 920px;\n      font-family:inherit;\n      color: var(--aobo-text);\n      line-height: 1.7;\n      background: transparent;\n      padding: 0;\n      box-sizing: border-box;\n    }\n\n    .aobo-tool-steel-page * {\n      box-sizing: border-box;\n    }\n\n    .aobo-wrap {\n      max-width: var(--aobo-page-width);\n      margin: 0 auto;\n      padding: 0;\n    }\n\n    .aobo-hero {\n      background: linear-gradient(135deg, #ffffff 0%, #f7fbff 56%, #eaf2ff 100%);\n    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      padding: 20px;\n      }\n\n      .aobo-final-cta {\n        padding: 24px;\n      }\n    }\n  <\/style>\n\n  <div class=\"aobo-wrap\">\n    <header class=\"aobo-hero\">\n      <span class=\"aobo-eyebrow\">Tool Steel Guide<\/span>\n      <h1>What Is Tool Steel?<\/h1>\n      <p>Tool steel is a high carbon, high alloy steel made for cutting, forming, and shaping other materials. It is what tools, dies, and molds are built from, and it is engineered for hardness, wear resistance, and toughness instead of the strength and weldability that structural steel is built around.<\/p>\n      <p>What sets it apart is its chemistry. Carbon content varies with the job: cold work and high speed grades run high, from about 0.8 to 2.5 percent, while hot work and plastic mold grades run lower, around 0.3 to 0.4 percent, to keep toughness. On top of carbon, tool steels carry chromium, molybdenum, tungsten, vanadium, and cobalt. Part of this alloy dissolves into the matrix and slows the steel down during quenching, which is what gives deep hardenability from surface to core. The rest combines with carbon to form hard carbides, and those carbides are what resist wear.<\/p>\n      <div class=\"aobo-hero-actions\">\n        <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/ko\/tool-steels\/\">\uacf5\uad6c\uac15 \uce74\ud0c8\ub85c\uadf8 \ubcf4\uae30<\/a>\n        <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">\ubb38\uc758 \ubcf4\ub0b4\uae30<\/a>\n      <\/div>\n    <\/header>\n\n    <main class=\"aobo-article\">\n      <h2>What Makes Tool Steel Different<\/h2>\n      <p>A tool has to cut, form, or hold shape under heavy load without cracking, wearing out, or losing its edge. That working demand is what tool steel is engineered around, and it is why these grades are judged on a specific set of properties:<\/p>\n\n      <ul class=\"aobo-feature-list\">\n        <li><strong>High hardness<\/strong>, which lets a tool cut and form harder materials. Cold work and high speed grades typically reach 55 to 65 HRC, while hot work dies and pre hardened mold steel are run softer on purpose to keep toughness.<\/li>\n        <li><strong>\ub0b4\ub9c8\ubaa8\uc131<\/strong>, supplied by hard chromium, vanadium, and tungsten carbides held in a martensitic matrix.<\/li>\n        <li><strong>\uac15\uc778\ud568<\/strong>, the resistance to cracking and chipping under impact loads.<\/li>\n        <li><strong>\uace0\uc628 \uacbd\ub3c4<\/strong>, the ability to stay hard at elevated temperature, which decides whether a grade can be used for hot work at all.<\/li>\n        <li><strong>\uce58\uc218 \uc548\uc815\uc131<\/strong>, low distortion during hardening so finished tools stay on size.<\/li>\n        <li><strong>\uac15\ud654\uc131<\/strong>, full hardness from surface to core in heavy sections, not just a hard skin over a soft center.<\/li>\n      <\/ul>\n\n      <h2>Types of Tool Steel<\/h2>\n      <p>Tool steels are grouped by how they are used and the temperature they see in service. The AISI system gives each group a letter prefix, and choosing the right group is the first step in matching a grade to a job.<\/p>\n\n      <h3>\ub0c9\uac04 \uac00\uacf5 \uacf5\uad6c\uac15<\/h3>\n      <p>Cold work grades run below about 200 C at the tool surface, so they are built for wear resistance and compressive strength rather than heat resistance. The high carbon, high chromium D series, such as <a href=\"https:\/\/aobosteel.com\/ko\/d2-tool-steel\/\">\ub5142<\/a> (1.2379 \/ SKD11) and <a href=\"https:\/\/aobosteel.com\/ko\/d3-tool-steel\/\">\ub5143<\/a> (1.2080 \/ SKD1), carries around 12 percent chromium for heavy wear resistance. The air hardening A series, led by <a href=\"https:\/\/aobosteel.com\/ko\/a2-tool-steel\/\">A2<\/a> (1.2363 \/ SKD12) at 5 percent chromium, gives up some wear resistance in exchange for better toughness and stability. The oil hardening O series, including <a href=\"https:\/\/aobosteel.com\/ko\/o1-tool-steel\/\">\uc6241<\/a> (1.2510) and <a href=\"https:\/\/aobosteel.com\/ko\/o2-tool-steel\/\">\uc0b0\uc18c<\/a> (1.2842), runs leaner on alloy and machines easily. Typical work includes blanking dies, punches, shear blades, cold extrusion and forming dies, thread rolling dies, gauges, and cutting tools.<\/p>\n\n      <div class=\"aobo-inline-cta\">\n        <p>Need cold work grades like D2, A2, or O1 in bulk for dies and punches?<\/p>\n        <div class=\"aobo-inline-actions\">\n          <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/ko\/cold-work-tool-steels\/\">View Cold Work Steel Catalog<\/a>\n          <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">\ubb38\uc758 \ubcf4\ub0b4\uae30<\/a>\n        <\/div>\n      <\/div>\n\n      <h3>\uace0\uc628 \uc791\uc5c5\uc6a9 \uacf5\uad6c\uac15<\/h3>\n      <p>Hot work grades operate from roughly 300 to 700 C and have to resist softening, thermal fatigue, and heat checking. The chromium based H series, such as <a href=\"https:\/\/aobosteel.com\/ko\/h13-tool-steel\/\">H13<\/a> (1.2344 \/ SKD61) and <a href=\"https:\/\/aobosteel.com\/ko\/h11-tool-steel\/\">H11<\/a> (1.2343 \/ SKD6), uses about 5 percent chromium with molybdenum and vanadium to hold strength while hot. A separate tungsten branch, led by <a href=\"https:\/\/aobosteel.com\/ko\/h21-tool-steel\/\">H21<\/a> (1.2581) with around 9 percent tungsten, trades some toughness for higher hot strength in heavier hot work tooling. Typical work includes die casting dies, aluminum extrusion dies, hot forging and hot stamping dies, and hot shear blades.<\/p>\n\n      <div class=\"aobo-inline-cta\">\n        <p>Sourcing hot work grades like H13 or H11 for die casting or extrusion?<\/p>\n        <div class=\"aobo-inline-actions\">\n          <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/ko\/hot-work-tool-steel\/\">View Hot Work Steel Catalog<\/a>\n          <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">\ubb38\uc758 \ubcf4\ub0b4\uae30<\/a>\n        <\/div>\n      <\/div>\n\n      <h3>Shock-Resisting Tool Steels<\/h3>\n      <p>Shock resisting grades put toughness ahead of wear resistance for work that takes repeated impact. The S series, such as <a href=\"https:\/\/aobosteel.com\/ko\/s7-tool-steel\/\">S7<\/a> \uadf8\ub9ac\uace0 <a href=\"https:\/\/aobosteel.com\/ko\/s1-tool-steel\/\">S1<\/a> (1.2550), is built to absorb shock without cracking. Typical work includes chisels, pneumatic tool bits, impact punches, and shear blades.<\/p>\n\n      <div class=\"aobo-inline-cta\">\n        <p>Looking for S7 or S1 in bulk for chisels, punches, and impact tooling?<\/p>\n        <div class=\"aobo-inline-actions\">\n          <a class=\"aobo-btn aobo-btn-detail\" href=\"https:\/\/aobosteel.com\/ko\/s-series-tool-steel\/\">View Shock-Resisting Grades<\/a>\n          <a class=\"aobo-btn aobo-btn-inquiry popmake-16052\" href=\"javascript:void(0);\">\ubb38\uc758 \ubcf4\ub0b4\uae30<\/a>\n        <\/div>\n      <\/div>\n\n      <h3>Mold Steels<\/h3>\n      <p>Mold steels are made for plastic injection molds and similar tooling, where machinability, polishability, and dimensional stability matter most. The P series, such as <a href=\"https:\/\/aobosteel.com\/ko\/p20-tool-steel\/\">P20<\/a> (1.2311) and the nickel bearing <a href=\"https:\/\/aobosteel.com\/ko\/p20ni-steel\/\">P20+Ni<\/a> (1.2738), is usually supplied pre hardened so it can be machined and put straight to work without further heat treatment. Typical work includes plastic injection molds, blow molds, and compression molds.<\/p>\n\n      <h3>High-Speed Steels<\/h3>\n      <p>High speed steels are cutting tool grades that stay sharp even when the cutting edge reaches red heat. The M series, including <a href=\"https:\/\/aobosteel.com\/ko\/m2-tool-steel\/\">\uc5e02<\/a> (1.3343 \/ SKH51), <a href=\"https:\/\/aobosteel.com\/ko\/m35-tool-steel\/\">\uc5e035<\/a>, \uadf8\ub9ac\uace0 <a href=\"https:\/\/aobosteel.com\/ko\/m42-tool-steel\/\">M42<\/a>, relies on tungsten, molybdenum, vanadium, and cobalt for red hardness. Typical work includes drills, milling cutters, hobs, broaches, and taps.<\/p>\n\n      <h2>Alloying Elements and What They Do<\/h2>\n      <div class=\"aobo-table-wrap\">\n        <table class=\"aobo-table\">\n          <thead>\n            <tr>\n              <th>\uc694\uc18c<\/th>\n              <th>\uc77c\ubc18\uc801\uc778 \ubc94\uc704<\/th>\n              <th>Primary Function<\/th>\n            <\/tr>\n          <\/thead>\n          <tbody>\n            <tr>\n              <td>\ud0c4\uc18c(C)<\/td>\n              <td>0.5 to 2.5%<\/td>\n              <td>Forms martensite for hardness and carbides for wear resistance.<\/td>\n            <\/tr>\n            <tr>\n              <td>\ud06c\ub86c(Cr)<\/td>\n              <td>0.5 to 12%<\/td>\n              <td>Carbide formation and deep hardenability; gives corrosion resistance only in stainless grades such as <a href=\"https:\/\/aobosteel.com\/ko\/440c-stainless-steel\/\">440\ub3c4<\/a>, not in high chromium cold work steel like D2.<\/td>\n            <\/tr>\n            <tr>\n              <td>\ubab0\ub9ac\ube0c\ub374(Mo)<\/td>\n              <td>0.2 to 10%<\/td>\n              <td>Hot hardness, secondary hardening, and carbide formation.<\/td>\n            <\/tr>\n            <tr>\n              <td>\ud145\uc2a4\ud150(W)<\/td>\n              <td>0.5 to 18%<\/td>\n              <td>Hot hardness and wear resistance.<\/td>\n            <\/tr>\n            <tr>\n              <td>\ubc14\ub098\ub4d0(V)<\/td>\n              <td>0.1 to 5%<\/td>\n              <td>Fine grain size and wear resistance through hard VC carbides.<\/td>\n            <\/tr>\n            <tr>\n              <td>\ucf54\ubc1c\ud2b8(Co)<\/td>\n              <td>5 to 12%<\/td>\n              <td>Red hardness in high speed steel grades.<\/td>\n            <\/tr>\n            <tr>\n              <td>\ub9dd\uac04(Mn)<\/td>\n              <td>0.2 to 2%<\/td>\n              <td>Hardenability and deoxidation.<\/td>\n            <\/tr>\n            <tr>\n              <td>\uc2e4\ub9ac\ucf58(Si)<\/td>\n              <td>0.2 to 2%<\/td>\n              <td>Strengthening and deoxidation.<\/td>\n            <\/tr>\n          <\/tbody>\n        <\/table>\n      <\/div>\n\n      <h2>Tool Steel Compared With Other Steels<\/h2>\n      <p>Buyers often have to decide whether a job really needs tool steel or whether a cheaper, more common steel will do. The difference comes down to carbon and alloy content, and what they let the steel do.<\/p>\n\n      <h3>Tool Steel vs Structural Steel<\/h3>\n      <p>Structural steels such as A36 and S355 are made for load bearing, weldability, and ductility. They carry under about 0.3 percent carbon and little alloy, and they are not meant to harden to tool levels. Tool steel carries far more carbon and alloy, which is exactly what lets it reach and hold high hardness.<\/p>\n\n      <h3>Tool Steel vs Alloy Engineering Steel<\/h3>\n      <p>Alloy engineering steels such as 4140 and 4340 harden to moderate levels, usually 30 to 50 HRC, and 4140 can reach about 55 HRC in thin sections. What they lack is the carbide volume to match the wear resistance of D2 or the hot hardness of H13, so they suit shafts and gears more than dies and cutting tools.<\/p>\n\n      <h3>Tool Steel vs Stainless Steel<\/h3>\n      <p>Most stainless steels put corrosion resistance ahead of hardness. The martensitic grades bridge the two worlds. Steels like 420 and 440C are stainless by composition but work as tool steels in knives and bearings, with 440C reaching 58 to 60 HRC while staying corrosion resistant.<\/p>\n\n      <div class=\"aobo-note-box\">\n        <p>Tool steel selection is always a balance. Higher wear resistance often reduces toughness, while higher toughness can reduce edge retention or abrasive wear life. The best grade is the one that matches the actual failure mode of the tool.<\/p>\n      <\/div>\n\n      <h2>Supply Forms<\/h2>\n      <p>Aobo Steel supplies tool steel as forged or hot rolled round bar, flat bar and plate, and forged block for large die applications. Surfaces are available black as forged or as rolled, peeled, turned, or milled. Material ships in the annealed, machinable condition, with hardened and tempered supply available on request for selected grades. Contact us for current sizes and stock, including large forged sections.<\/p>\n    <\/main>\n\n    <div class=\"aobo-final-cta\">\n      <div>\n        <h2>Need Tool Steel for Dies, Molds, or Cutting Tools?<\/h2>\n        <p>Send your grade, size, condition, and quantity requirements to Aobo Steel. We can quote available forged or hot rolled tool steel in bulk supply forms.<\/p>\n      <\/div>\n      <a class=\"aobo-btn popmake-16052\" href=\"javascript:void(0);\">\ubb38\uc758 \ubcf4\ub0b4\uae30<\/a>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n\n<ul class=\"wp-block-yoast-seo-related-links yoast-seo-related-links\">\n<li><a href=\"https:\/\/aobosteel.com\/ko\/s7-tool-steel-rockwell-hardness-chart\/\">S7 \uacf5\uad6c\uac15 \ub85c\ud06c\uc6f0 \uacbd\ub3c4\ud45c | HRC, HB \ubc0f \uc791\uc5c5 \ubc94\uc704<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/o1-steel-hardness\/\">O1 Steel Hardness: Annealed, Quenched &amp; Tempered HRC Guide<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/h13-steel-heat-treatment\/\">H13 \uc5f4\ucc98\ub9ac \uac00\uc774\ub4dc | \uc544\uc624\ubcf4 \uc2a4\ud2f8<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/h13-steel-hardness\/\">H13\uac15 \uacbd\ub3c4: HRC \ubc94\uc704, \ud15c\ud37c\ub9c1 \ucc28\ud2b8 \ubc0f \uc801\uc6a9 \ubd84\uc57c<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/aobosteel.com\/ko\/s1-tool-steel-heat-treatment-guide\/\">S1 Tool Steel Heat Treatment&nbsp;Guide<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Tool Steel Guide What Is Tool Steel? Tool steel is a high carbon, high alloy steel made for cutting, forming, and shaping other materials. It is what tools, dies, and molds are built from, and it is engineered for hardness, wear resistance, and toughness instead of the strength and weldability that structural steel is built [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":15989,"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-15986","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What Is Tool Steel? 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