Tool Steel Heat Treatment Technical Center | Aobo Steel<\/title>\n<meta name=\"description\" content=\"Heat treatment guidance for tool steel by grade \u2014 austenitizing, quenching and working hardness for cold work, hot work, high speed and mold steels. 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Center<\/span>\n <h1>Heat treatment guidance for tool steel, by grade.<\/h1>\n <p>Austenitizing, quenching and working-hardness references for cold work, hot work, high speed, stainless and bearing steels, along with the fundamentals that keep distortion and cracking under control. Read the guide you need, or send specs for a bulk supply quote.<\/p>\n <div class=\"hero-cta\">\n <a href=\"#contact\" class=\"btn btn-heat\">Request a quote<\/a>\n <a href=\"https:\/\/aobosteel.com\/ko\/tool-steels\/\" class=\"btn btn-ghost\">View Tool Steel Catalog<\/a>\n <\/div>\n <\/div>\n<\/header>\n\n\n<section class=\"guides\" id=\"guides\">\n <div class=\"wrap\">\n \n <div class=\"cat\" id=\"cold-work\">\n <div class=\"cat-header\"><h3>Cold Work<\/h3><span class=\"cat-note\">Wear-resistant grades for blanking, forming and cutting at room temperature.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">D2<\/span><span class=\"card-desig\">1.2379 \/ SKD11<\/span><\/div>\n <p class=\"card-desc\">High-carbon high-chromium cold-work steel. Air hardening keeps distortion low while delivering excellent wear resistance for long production runs.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">995\u20131030\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">58\u201360 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/d2-tool-steel-heat-treatment-guide\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">D3<\/span><span class=\"card-desig\">1.2080 \/ SKD1<\/span><\/div>\n <p class=\"card-desc\">High-wear cold-work steel for long-run blanking and forming. Oil hardening reaches very high hardness but calls for care to avoid quench cracking.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">925\u2013980\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">58\u201364 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/d3-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">D6<\/span><span class=\"card-desig\">1.2436 \/ SKD2<\/span><\/div>\n <p class=\"card-desc\">Tungsten-alloyed cold-work steel with fine, stable carbides that hold a keen edge in cutting and trimming tools.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">~960\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">58\u201364 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/d6-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">A2<\/span><span class=\"card-desig\">1.2363 \/ SKD12<\/span><\/div>\n <p class=\"card-desc\">Air-hardening cold-work steel that balances wear resistance and toughness, with better dimensional stability than oil-hardening grades.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">925\u2013980\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">57\u201362 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/a2-tool-steel-heat-treatment-guide\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">O1<\/span><span class=\"card-desig\">1.2510 \/ SKS3<\/span><\/div>\n <p class=\"card-desc\">General-purpose oil-hardening tool steel, easy to machine and forgiving in the shop, a reliable choice for short to medium runs.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">790\u2013815\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">57\u201362 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/o1-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">O2<\/span><span class=\"card-desig\">1.2842<\/span><\/div>\n <p class=\"card-desc\">Manganese oil-hardening steel with low distortion on quench, well suited to gauges and precision tooling.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">790\u2013815\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">57\u201362 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/o2-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cat\" id=\"shock\">\n <div class=\"cat-header\"><h3>Shock-Resisting<\/h3><span class=\"cat-note\">Tough grades for tooling under heavy impact and shock loads.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">S1<\/span><span class=\"card-desig\">1.2550<\/span><\/div>\n <p class=\"card-desc\">Tungsten shock-resisting steel for impact tools that also need moderate wear resistance. Often tempered immediately after quench to prevent cracking.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">900\u2013955\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">50\u201358 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/s1-tool-steel-heat-treatment-guide\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">S7<\/span><span class=\"card-desig\">1.2355<\/span><\/div>\n <p class=\"card-desc\">Air-hardening shock-resisting steel with high toughness and deep hardenability for dies that take repeated heavy impact.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">925\u2013955\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">54\u201358 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/s7-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cat\" id=\"hot-work\">\n <div class=\"cat-header\"><h3>Hot Work<\/h3><span class=\"cat-note\">Grades that hold strength and resist thermal fatigue at elevated temperatures.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">H10<\/span><span class=\"card-desig\">1.2365<\/span><\/div>\n <p class=\"card-desc\">Chromium-molybdenum hot-work steel with strong resistance to thermal softening, used for hot punches, extrusion tooling and inserts.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">995\u20131025\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">40\u201352 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/h10-tool-steel-heat-treatment-guide\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">H11<\/span><span class=\"card-desig\">1.2343 \/ SKD6<\/span><\/div>\n <p class=\"card-desc\">Air-hardening hot-work steel with deep hardenability and high toughness for die casting, extrusion and forging dies.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">995\u20131025\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">42\u201354 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/h11-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">H13<\/span><span class=\"card-desig\">1.2344 \/ SKD61<\/span><\/div>\n <p class=\"card-desc\">The workhorse hot-work grade, combining thermal-fatigue resistance with toughness for die casting, forging and extrusion dies.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">995\u20131040\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">44\u201352 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/h13-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cat\" id=\"high-speed\">\n <div class=\"cat-header\"><h3>High Speed<\/h3><span class=\"cat-note\">Red-hard grades for cutting tools that run hot and fast.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">M2<\/span><span class=\"card-desig\">1.3343 \/ SKH51<\/span><\/div>\n <p class=\"card-desc\">Versatile high-speed steel with a strong balance of wear resistance and toughness for drills, taps and cutting tools.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">1190\u20131230\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil\/Air\/Salt<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">60\u201365 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/m2-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cat\" id=\"stainless\">\n <div class=\"cat-header\"><h3>Stainless<\/h3><span class=\"cat-note\">Corrosion-resistant grades for molds, blades and wear parts in wet or hygienic environments.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">440C<\/span><span class=\"card-desig\">1.4125 \/ SUS440C<\/span><\/div>\n <p class=\"card-desc\">High-carbon martensitic stainless steel that reaches high hardness while resisting corrosion, used for bearings, knife blades and wear parts.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">1010-1065°C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil \/ Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">58-60 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/440c-stainless-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">420<\/span><span class=\"card-desig\">1.2083 \/ SUS420<\/span><\/div>\n <p class=\"card-desc\">Corrosion-resistant martensitic stainless steel with good polishability, widely used for plastic molds and blades that run in humid or corrosive conditions.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">980-1035°C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil \/ Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">48-52 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/420-stainless-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cat\" id=\"bearing\">\n <div class=\"cat-header\"><h3>Bearing & Other<\/h3><span class=\"cat-note\">Specialist grades for bearings and shock-loaded forging tooling.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">52100<\/span><span class=\"card-desig\">1.3505 \/ 100Cr6<\/span><\/div>\n <p class=\"card-desc\">High-carbon chromium bearing steel for components that need high hardness and good wear resistance, such as rollers and races.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">815\u2013860\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">60\u201364 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/52100-steel-heat-treatment-guide\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">L6<\/span><span class=\"card-desig\">1.2714 \/ SKT4<\/span><\/div>\n <p class=\"card-desc\">Nickel-chromium tool steel with high toughness and good hardenability for shock-loaded dies and large forging tooling.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">815\u2013870\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">45\u201358 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/l6-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n <\/div>\n<\/section>\n\n\n<section class=\"fund\">\n <div class=\"wrap\">\n <h2>Heat treatment, in four steps<\/h2>\n <p class=\"fund-lead\">Heat treatment is controlled heating and cooling that changes microstructure and properties while limiting shape change. The chain runs preheat, austenitize, quench and temper, and the final result is set by its weakest link, above all furnace uniformity, part geometry and quench severity.<\/p>\n\n <div class=\"fund-cols\">\n <div>\n <h4><span class=\"dot\"><\/span>Process chain<\/h4>\n <ol class=\"steps\">\n <li><b>Preheat<\/b> reduces thermal shock and lowers the risk of cracking.<\/li>\n <li><b>Austenitize<\/b> dissolves carbides to enrich the austenite with carbon and alloying elements.<\/li>\n <li><b>Quench<\/b> suppresses pearlite and bainite to form martensite.<\/li>\n <li><b>Temper<\/b> restores toughness and controls retained austenite.<\/li>\n <\/ol>\n <\/div>\n <div>\n <h4><span class=\"dot\"><\/span>Common risk factors<\/h4>\n <ul class=\"risks\">\n <li><b>Distortion<\/b> Comes from residual stress, thermal gradients and the volume change of phase transformation.<\/li>\n <li><b>Quench cracking<\/b> Rises with sharp corners, high tensile stress and excessive quench severity.<\/li>\n <li><b>Retained austenite<\/b> May need multiple tempers or cryogenic treatment in high-alloy grades.<\/li>\n <li><b>Decarburization<\/b> Comes from non-neutral atmospheres; protective atmospheres or vacuum furnaces help.<\/li>\n <\/ul>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<div class=\"validation\">\n <div class=\"wrap\">\n <p>Aobo Steel supplies tool steel in the annealed condition, ready for you to machine and heat treat. The process ranges here are drawn from established metallurgical standards, international grade data and long-term industry practice, and reflect real operational feedback from forging, die-making and production users. Heat treatment itself is carried out on your side, so this guidance is offered as a reference to support that work. Because tool performance comes from many factors, with heat treatment just one stage whose outcome is further shaped by furnace control, part geometry and quench, these ranges are best read as a starting point and confirmed for your own parts.<\/p>\n <\/div>\n<\/div>\n\n\n<section class=\"footcta\" id=\"contact\">\n <div class=\"wrap\">\n <h2>Send your specs, get a clear answer<\/h2>\n <p>Tell us the grade, dimensions and quantity, or describe the tool you are making. Aobo Steel supplies tool steel in bulk to distributors, stockists and importers, with quality control and technical support behind every order.<\/p>\n <div class=\"hero-cta\">\n <a href=\"#\" class=\"btn btn-heat\">Request a quote<\/a>\n <\/div>\n <\/div>\n<\/section>\n\n<\/body>\n<\/html>","protected":false},"excerpt":{"rendered":"<p>Tool Steel Heat Treatment Technical Center | Aobo Steel Tool Steel Heat Treatment Technical Center Heat treatment guidance for tool steel, by grade. Austenitizing, quenching and working-hardness references for cold work, hot work, high speed, stainless and bearing steels, along with the fundamentals that keep distortion and cracking under control. Read the guide you need, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"knowledge-article","_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":"","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-11825","page","type-page","status-publish","hentry"],"yoast_head":"\n<title>Tool Steel Heat Treatment Guide - 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Austenitizing, quenching and working-hardness references for cold work, hot work, high speed, stainless and bearing steels, along with the fundamentals that keep distortion and cracking under control. Read the guide you need,…","rttpg_featured_image_url":null,"rttpg_author":{"display_name":"Evan","author_link":"https:\/\/aobosteel.com\/ko\/blog\/author\/admin\/"},"rttpg_comment":0,"rttpg_category":null,"rttpg_excerpt":"Tool Steel Heat Treatment Technical Center | Aobo Steel Tool Steel Heat Treatment Technical Center Heat treatment guidance for tool steel, by grade. Austenitizing, quenching and working-hardness references for cold work, hot work, high speed, stainless and bearing steels, along with the fundamentals that keep distortion and cracking under control. 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Center<\/span>\n <h1>Heat treatment guidance for tool steel, by grade.<\/h1>\n <p>Austenitizing, quenching and working-hardness references for cold work, hot work, high speed, stainless and bearing steels, along with the fundamentals that keep distortion and cracking under control. Read the guide you need, or send specs for a bulk supply quote.<\/p>\n <div class=\"hero-cta\">\n <a href=\"#contact\" class=\"btn btn-heat\">Request a quote<\/a>\n <a href=\"https:\/\/aobosteel.com\/ko\/tool-steels\/\" class=\"btn btn-ghost\">View Tool Steel Catalog<\/a>\n <\/div>\n <\/div>\n<\/header>\n\n\n<section class=\"guides\" id=\"guides\">\n <div class=\"wrap\">\n \n <div class=\"cat\" id=\"cold-work\">\n <div class=\"cat-header\"><h3>Cold Work<\/h3><span class=\"cat-note\">Wear-resistant grades for blanking, forming and cutting at room temperature.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">D2<\/span><span class=\"card-desig\">1.2379 \/ SKD11<\/span><\/div>\n <p class=\"card-desc\">High-carbon high-chromium cold-work steel. Air hardening keeps distortion low while delivering excellent wear resistance for long production runs.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">995\u20131030\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">58\u201360 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/d2-tool-steel-heat-treatment-guide\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">D3<\/span><span class=\"card-desig\">1.2080 \/ SKD1<\/span><\/div>\n <p class=\"card-desc\">High-wear cold-work steel for long-run blanking and forming. Oil hardening reaches very high hardness but calls for care to avoid quench cracking.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">925\u2013980\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">58\u201364 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/d3-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">D6<\/span><span class=\"card-desig\">1.2436 \/ SKD2<\/span><\/div>\n <p class=\"card-desc\">Tungsten-alloyed cold-work steel with fine, stable carbides that hold a keen edge in cutting and trimming tools.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">~960\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">58\u201364 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/d6-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">A2<\/span><span class=\"card-desig\">1.2363 \/ SKD12<\/span><\/div>\n <p class=\"card-desc\">Air-hardening cold-work steel that balances wear resistance and toughness, with better dimensional stability than oil-hardening grades.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">925\u2013980\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">57\u201362 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/a2-tool-steel-heat-treatment-guide\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">O1<\/span><span class=\"card-desig\">1.2510 \/ SKS3<\/span><\/div>\n <p class=\"card-desc\">General-purpose oil-hardening tool steel, easy to machine and forgiving in the shop, a reliable choice for short to medium runs.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">790\u2013815\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">57\u201362 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/o1-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">O2<\/span><span class=\"card-desig\">1.2842<\/span><\/div>\n <p class=\"card-desc\">Manganese oil-hardening steel with low distortion on quench, well suited to gauges and precision tooling.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">790\u2013815\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">57\u201362 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/o2-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cat\" id=\"shock\">\n <div class=\"cat-header\"><h3>Shock-Resisting<\/h3><span class=\"cat-note\">Tough grades for tooling under heavy impact and shock loads.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">S1<\/span><span class=\"card-desig\">1.2550<\/span><\/div>\n <p class=\"card-desc\">Tungsten shock-resisting steel for impact tools that also need moderate wear resistance. Often tempered immediately after quench to prevent cracking.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">900\u2013955\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">50\u201358 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/s1-tool-steel-heat-treatment-guide\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">S7<\/span><span class=\"card-desig\">1.2355<\/span><\/div>\n <p class=\"card-desc\">Air-hardening shock-resisting steel with high toughness and deep hardenability for dies that take repeated heavy impact.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">925\u2013955\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">54\u201358 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/s7-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cat\" id=\"hot-work\">\n <div class=\"cat-header\"><h3>Hot Work<\/h3><span class=\"cat-note\">Grades that hold strength and resist thermal fatigue at elevated temperatures.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">H10<\/span><span class=\"card-desig\">1.2365<\/span><\/div>\n <p class=\"card-desc\">Chromium-molybdenum hot-work steel with strong resistance to thermal softening, used for hot punches, extrusion tooling and inserts.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">995\u20131025\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">40\u201352 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/h10-tool-steel-heat-treatment-guide\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">H11<\/span><span class=\"card-desig\">1.2343 \/ SKD6<\/span><\/div>\n <p class=\"card-desc\">Air-hardening hot-work steel with deep hardenability and high toughness for die casting, extrusion and forging dies.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">995\u20131025\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">42\u201354 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/h11-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">H13<\/span><span class=\"card-desig\">1.2344 \/ SKD61<\/span><\/div>\n <p class=\"card-desc\">The workhorse hot-work grade, combining thermal-fatigue resistance with toughness for die casting, forging and extrusion dies.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">995\u20131040\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">44\u201352 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/h13-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cat\" id=\"high-speed\">\n <div class=\"cat-header\"><h3>High Speed<\/h3><span class=\"cat-note\">Red-hard grades for cutting tools that run hot and fast.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">M2<\/span><span class=\"card-desig\">1.3343 \/ SKH51<\/span><\/div>\n <p class=\"card-desc\">Versatile high-speed steel with a strong balance of wear resistance and toughness for drills, taps and cutting tools.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">1190\u20131230\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil\/Air\/Salt<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">60\u201365 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/m2-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cat\" id=\"stainless\">\n <div class=\"cat-header\"><h3>Stainless<\/h3><span class=\"cat-note\">Corrosion-resistant grades for molds, blades and wear parts in wet or hygienic environments.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">440C<\/span><span class=\"card-desig\">1.4125 \/ SUS440C<\/span><\/div>\n <p class=\"card-desc\">High-carbon martensitic stainless steel that reaches high hardness while resisting corrosion, used for bearings, knife blades and wear parts.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">1010-1065°C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil \/ Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">58-60 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/440c-stainless-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">420<\/span><span class=\"card-desig\">1.2083 \/ SUS420<\/span><\/div>\n <p class=\"card-desc\">Corrosion-resistant martensitic stainless steel with good polishability, widely used for plastic molds and blades that run in humid or corrosive conditions.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">980-1035°C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil \/ Air<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">48-52 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/420-stainless-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cat\" id=\"bearing\">\n <div class=\"cat-header\"><h3>Bearing & Other<\/h3><span class=\"cat-note\">Specialist grades for bearings and shock-loaded forging tooling.<\/span><\/div>\n <div class=\"grid\">\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">52100<\/span><span class=\"card-desig\">1.3505 \/ 100Cr6<\/span><\/div>\n <p class=\"card-desc\">High-carbon chromium bearing steel for components that need high hardness and good wear resistance, such as rollers and races.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">815\u2013860\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">60\u201364 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/52100-steel-heat-treatment-guide\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <article class=\"card\">\n <div class=\"card-top\"><span class=\"card-grade\">L6<\/span><span class=\"card-desig\">1.2714 \/ SKT4<\/span><\/div>\n <p class=\"card-desc\">Nickel-chromium tool steel with high toughness and good hardenability for shock-loaded dies and large forging tooling.<\/p>\n <div class=\"spec\">\n <div><span class=\"k\">Austenitize<\/span><span class=\"v hot\">815\u2013870\u00b0C<\/span><\/div>\n <div><span class=\"k\">Quench<\/span><span class=\"v\">Oil<\/span><\/div>\n <div><span class=\"k\">Working<\/span><span class=\"v\">45\u201358 HRC<\/span><\/div>\n <\/div>\n <div class=\"card-actions\"><a class=\"a-guide\" href=\"https:\/\/aobosteel.com\/ko\/l6-tool-steel-heat-treatment\/\">Read guide<\/a><a class=\"a-quote\" href=\"#contact\">Request a quote<\/a><\/div>\n <\/article>\n\n <\/div>\n <\/div>\n\n <\/div>\n<\/section>\n\n\n<section class=\"fund\">\n <div class=\"wrap\">\n <h2>Heat treatment, in four steps<\/h2>\n <p class=\"fund-lead\">Heat treatment is controlled heating and cooling that changes microstructure and properties while limiting shape change. The chain runs preheat, austenitize, quench and temper, and the final result is set by its weakest link, above all furnace uniformity, part geometry and quench severity.<\/p>\n\n <div class=\"fund-cols\">\n <div>\n <h4><span class=\"dot\"><\/span>Process chain<\/h4>\n <ol class=\"steps\">\n <li><b>Preheat<\/b> reduces thermal shock and lowers the risk of cracking.<\/li>\n <li><b>Austenitize<\/b> dissolves carbides to enrich the austenite with carbon and alloying elements.<\/li>\n <li><b>Quench<\/b> suppresses pearlite and bainite to form martensite.<\/li>\n <li><b>Temper<\/b> restores toughness and controls retained austenite.<\/li>\n <\/ol>\n <\/div>\n <div>\n <h4><span class=\"dot\"><\/span>Common risk factors<\/h4>\n <ul class=\"risks\">\n <li><b>Distortion<\/b> Comes from residual stress, thermal gradients and the volume change of phase transformation.<\/li>\n <li><b>Quench cracking<\/b> Rises with sharp corners, high tensile stress and excessive quench severity.<\/li>\n <li><b>Retained austenite<\/b> May need multiple tempers or cryogenic treatment in high-alloy grades.<\/li>\n <li><b>Decarburization<\/b> Comes from non-neutral atmospheres; protective atmospheres or vacuum furnaces help.<\/li>\n <\/ul>\n <\/div>\n <\/div>\n <\/div>\n<\/section>\n\n\n<div class=\"validation\">\n <div class=\"wrap\">\n <p>Aobo Steel supplies tool steel in the annealed condition, ready for you to machine and heat treat. The process ranges here are drawn from established metallurgical standards, international grade data and long-term industry practice, and reflect real operational feedback from forging, die-making and production users. Heat treatment itself is carried out on your side, so this guidance is offered as a reference to support that work. Because tool performance comes from many factors, with heat treatment just one stage whose outcome is further shaped by furnace control, part geometry and quench, these ranges are best read as a starting point and confirmed for your own parts.<\/p>\n <\/div>\n<\/div>\n\n\n<section class=\"footcta\" id=\"contact\">\n <div class=\"wrap\">\n <h2>Send your specs, get a clear answer<\/h2>\n <p>Tell us the grade, dimensions and quantity, or describe the tool you are making. Aobo Steel supplies tool steel in bulk to distributors, stockists and importers, with quality control and technical support behind every order.<\/p>\n <div class=\"hero-cta\">\n <a href=\"#\" class=\"btn btn-heat\">Request a quote<\/a>\n <\/div>\n <\/div>\n<\/section>\n\n<\/body>\n<\/html>","protected":false},"excerpt":{"rendered":"<p>Tool Steel Heat Treatment Technical Center | Aobo Steel Tool Steel Heat Treatment Technical Center Heat treatment guidance for tool steel, by grade. Austenitizing, quenching and working-hardness references for cold work, hot work, high speed, stainless and bearing steels, along with the fundamentals that keep distortion and cracking under control. Read the guide you need, […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"content-type":"knowledge-article","_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":"","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-11825","page","type-page","status-publish","hentry"],"yoast_head":"\n<title>Tool Steel Heat Treatment Guide - 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