{"id":11734,"date":"2026-01-04T11:32:34","date_gmt":"2026-01-04T03:32:34","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=11734"},"modified":"2026-10-13T00:43:11","modified_gmt":"2026-10-12T16:43:11","slug":"o2-tool-steel-heat-treatment","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/o2-tool-steel-heat-treatment\/","title":{"rendered":"O2 \uacf5\uad6c\uac15 \uc5f4\ucc98\ub9ac \uac00\uc774\ub4dc"},"content":{"rendered":"\n<section class=\"aobo-o2-tool-steel-heat-treatment-page\">\n<style>\n    .aobo-o2-tool-steel-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-white: #ffffff;\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: 0;\n      box-sizing: border-box;\n    }\n\n    .aobo-o2-tool-steel-heat-treatment-page * {\n      box-sizing: border-box;\n    }\n\n    .aobo-wrap {\n      max-width: 1180px;\n      margin: 0 auto;\n      padding: 0;\n    }\n\n    .aobo-hero {\n      background: linear-gradient(135deg, #ffffff 0%, #f7fbff 56%, #eaf2ff 100%);\n      border: 1px solid var(--aobo-border);\n      border-radius: 28px;\n      padding: 42px 38px;\n      margin-bottom: 30px;\n      box-shadow: var(--aobo-shadow);\n      overflow: hidden;\n      position: relative;\n    }\n\n    .aobo-hero::after {\n      content: \"\";\n      position: absolute;\n      right: -90px;\n      top: -90px;\n      width: 260px;\n      height: 260px;\n      border-radius: 50%;\n      background: rgba(12, 86, 208, 0.08);\n    }\n\n    .aobo-eyebrow {\n      display: inline-block;\n      margin-bottom: 12px;\n      padding: 6px 12px;\n      border-radius: 999px;\n      background: #fff7ed;\n      border: 1px solid #fde3bd;\n      color: var(--aobo-orange);\n      font-size: 14px;\n      font-weight: 700;\n      position: relative;\n      z-index: 2;\n    }\n\n    .aobo-hero h1 {\n      margin: 0 0 16px;\n      color: #082d6f;\n      font-size: clamp(34px, 4vw, 54px);\n      line-height: 1.06;\n      letter-spacing: 0;\n      position: relative;\n      z-index: 2;\n    }\n\n    .aobo-hero p {\n      max-width: 940px;\n      margin: 0 0 12px;\n      font-size: 17px;\n      color: #314158;\n      position: relative;\n      z-index: 2;\n    }\n\n    .aobo-hero p:last-child {\n      margin-bottom: 0;\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      letter-spacing: 0;\n    }\n\n    .aobo-article h3 {\n      margin: 30px 0 10px;\n      color: #123f88;\n      font-size: 22px;\n      line-height: 1.3;\n      letter-spacing: 0;\n    }\n\n    .aobo-article p {\n      margin: 0 0 18px;\n      font-size: 17px;\n      color: var(--aobo-text);\n    }\n\n    .aobo-table-wrap {\n      overflow-x: auto;\n      margin: 22px 0 28px;\n      border-radius: 18px;\n      border: 1px solid var(--aobo-border);\n      box-shadow: 0 12px 32px rgba(12, 86, 208, 0.07);\n    }\n\n    .aobo-table {\n      width: 100%;\n      border-collapse: collapse;\n      background: var(--aobo-white);\n      min-width: 760px;\n    }\n\n    .aobo-table th {\n      background: var(--aobo-blue-soft);\n      color: #082d6f;\n      text-align: left;\n      padding: 14px 16px;\n      font-size: 15px;\n      vertical-align: top;\n    }\n\n    .aobo-table td {\n      padding: 14px 16px;\n      border-bottom: 1px solid #e8eef8;\n      vertical-align: top;\n      font-size: 15px;\n    }\n\n    .aobo-table tr:last-child td {\n      border-bottom: none;\n    }\n\n    .aobo-table td:first-child {\n      color: #082d6f;\n      font-weight: 700;\n    }\n\n    .aobo-figure {\n      margin: 24px 0 30px;\n      padding: 18px;\n      border: 1px solid var(--aobo-border);\n      border-radius: 18px;\n      background: var(--aobo-white);\n      box-shadow: 0 12px 32px rgba(12, 86, 208, 0.07);\n    }\n\n    .aobo-figure img {\n      display: block;\n      width: 60%;\n      max-width: 100%;\n      height: auto;\n      margin: 0 auto;\n      border-radius: 12px;\n    }\n\n    .aobo-figure figcaption {\n      margin-top: 12px;\n      color: var(--aobo-muted);\n      font-size: 14px;\n      line-height: 1.55;\n    }\n\n    .aobo-supply-block {\n      display: grid;\n      grid-template-columns: auto minmax(0, 1fr);\n      align-items: center;\n      gap: 24px;\n      margin: 0 0 30px;\n      border: 1px solid var(--aobo-border);\n      border-radius: 24px;\n      background: #ffffff;\n      box-shadow: 0 14px 36px rgba(12, 86, 208, 0.09);\n      overflow: hidden;\n      padding: 24px;\n    }\n\n    .aobo-supply-image {\n      width: 190px;\n      aspect-ratio: 1;\n      border: 1px solid var(--aobo-border);\n      border-radius: 18px;\n      overflow: hidden;\n      background: #f7fbff;\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 h2 {\n      margin: 0 0 8px;\n      color: #082d6f;\n      font-size: 24px;\n      line-height: 1.25;\n      letter-spacing: 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: 210px;\n    }\n\n    .aobo-related-pages {\n      margin: 38px 0 0;\n      padding: 30px 34px;\n      border: 1px solid var(--aobo-border);\n      border-radius: 26px;\n      background: #ffffff;\n      box-shadow: 0 12px 32px rgba(12, 86, 208, 0.07);\n    }\n\n    .aobo-related-pages h2 {\n      margin: 0;\n      color: #082d6f;\n      font-size: 30px;\n      line-height: 1.25;\n      letter-spacing: 0;\n    }\n\n    .aobo-related-grid {\n      display: grid;\n      grid-template-columns: repeat(2, minmax(0, 1fr));\n      gap: 14px;\n      margin-top: 18px;\n    }\n\n    .aobo-related-card {\n      display: block;\n      padding: 18px;\n      border: 1px solid var(--aobo-border);\n      border-radius: 16px;\n      background: #fbfdff;\n      text-decoration: none;\n      transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;\n    }\n\n    .aobo-related-card:hover {\n      transform: translateY(-2px);\n      border-color: rgba(12, 86, 208, 0.35);\n      box-shadow: 0 12px 26px rgba(12, 86, 208, 0.10);\n      background: #ffffff;\n    }\n\n    .aobo-related-card strong {\n      display: block;\n      margin-bottom: 6px;\n      color: #082d6f;\n      font-size: 17px;\n      line-height: 1.3;\n    }\n\n    .aobo-related-card span {\n      display: block;\n      color: var(--aobo-muted);\n      font-size: 15px;\n      line-height: 1.55;\n    }\n\n    .aobo-final-cta {\n      margin-top: 34px;\n      padding: 34px;\n      border-radius: 28px;\n      background: linear-gradient(135deg, #073b91 0%, #0c56d0 100%);\n      color: #ffffff;\n      box-shadow: 0 18px 45px rgba(12, 86, 208, 0.20);\n      display: flex;\n      align-items: center;\n      justify-content: space-between;\n      gap: 20px;\n      flex-wrap: wrap;\n    }\n\n    .aobo-final-cta h2 {\n      margin: 0 0 12px;\n      color: #ffffff;\n      font-size: 26px;\n      line-height: 1.25;\n      letter-spacing: 0;\n    }\n\n    .aobo-final-cta p {\n      margin: 0;\n      color: rgba(255, 255, 255, 0.92);\n      max-width: 760px;\n    }\n\n    .aobo-btn {\n      display: inline-flex;\n      align-items: center;\n      justify-content: center;\n      text-align: center;\n      min-height: 42px;\n      padding: 10px 18px;\n      border-radius: 999px;\n      text-decoration: none;\n      font-weight: 700;\n      font-size: 14px;\n      line-height: 1.2;\n      transition: all 0.2s ease;\n      cursor: pointer;\n      white-space: nowrap;\n    }\n\n    .aobo-btn:hover {\n      transform: translateY(-1px);\n    }\n\n    .aobo-btn-primary {\n      background: var(--aobo-blue);\n      color: #ffffff !important;\n      border: 1px solid var(--aobo-blue);\n    }\n\n    .aobo-btn-secondary {\n      background: #ffffff;\n      color: var(--aobo-blue) !important;\n      border: 1px solid var(--aobo-border);\n    }\n\n    .aobo-final-cta .aobo-btn {\n      flex: 0 0 auto;\n      background: #ffffff;\n      border: 1px solid #ffffff;\n      color: var(--aobo-blue) !important;\n    }\n\n    .aobo-final-cta .aobo-btn:hover {\n      transform: translateY(-1px);\n      background: #fff7ed;\n      color: var(--aobo-blue-dark) !important;\n    }\n\n    .aobo-cta-buttons {\n      display: flex;\n      gap: 10px;\n      flex-wrap: wrap;\n      align-items: center;\n    }\n\n    .aobo-final-cta .aobo-btn-detail {\n      background: transparent;\n      border-color: rgba(255, 255, 255, 0.75);\n      color: #ffffff !important;\n    }\n\n    .aobo-final-cta .aobo-btn-detail:hover {\n      background: rgba(255, 255, 255, 0.14);\n      border-color: #ffffff;\n      color: #ffffff !important;\n    }\n\n    .aobo-article a:not(.aobo-btn):not(.aobo-related-card),\n    .aobo-hero a:not(.aobo-btn):not(.aobo-related-card) {\n      color: var(--aobo-blue);\n      font-weight: 700;\n      text-decoration: none;\n      transition: color 0.2s ease, background 0.2s ease;\n    }\n\n    .aobo-article a:not(.aobo-btn):not(.aobo-related-card):hover,\n    .aobo-hero a:not(.aobo-btn):not(.aobo-related-card):hover {\n      color: var(--aobo-orange);\n      background: var(--aobo-blue-soft);\n    }\n\n    @media (max-width: 760px) {\n      .aobo-hero {\n        padding: 30px 22px;\n      }\n\n      .aobo-article h2 {\n        font-size: 25px;\n      }\n\n      .aobo-article h3 {\n        font-size: 20px;\n      }\n\n      .aobo-final-cta {\n        padding: 26px 22px;\n      }\n\n      .aobo-cta-buttons {\n        width: 100%;\n        flex-direction: column;\n        align-items: stretch;\n      }\n\n      .aobo-supply-block {\n        grid-template-columns: 1fr;\n        gap: 18px;\n        padding: 20px;\n      }\n\n      .aobo-supply-image {\n        width: min(190px, 100%);\n        margin: 0 auto;\n      }\n\n      .aobo-supply-actions .aobo-btn {\n        width: 100%;\n      }\n\n      .aobo-related-pages {\n        padding: 24px 20px;\n      }\n\n      .aobo-related-pages h2 {\n        font-size: 25px;\n      }\n\n      .aobo-related-grid {\n        grid-template-columns: 1fr;\n      }\n\n      .aobo-figure img {\n        width: 100%;\n      }\n    }\n  <\/style>\n<style 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.aobo-hero{padding: 30px 22px}.entry-content[class] .aobo-final-cta{padding: 26px 22px}.entry-content[class] .aobo-final-cta .aobo-btn{width: 100%}}\n<\/style>\n<style id=\"aobo-hero-plain\">\n  \/* \u8f7b\u6539\u7248\u6807\u51c6\uff1ahero \u53bb\u65b9\u6846 \u00b7 H1 \u4e00\u884c\u5c45\u4e2d \u00b7 \u8868\u683c\u4e0e\u56fe\u7247\u53bb\u5706\u89d2 \u00b7 \u4fa7\u680f\u4ece H1 \u4e0b\u65b9\u5f00\u59cb *\/\n  .entry-content[class] .aobo-hero,\n  .aobo-o2-tool-steel-heat-treatment-page .aobo-hero {\n    background: none !important; border: 0 !important; border-radius: 0 !important;\n    box-shadow: none !important; overflow: visible !important;\n    padding: 0 !important; margin: 0 0 20px !important;\n  }\n  .entry-content[class] .aobo-hero::after,\n  .aobo-o2-tool-steel-heat-treatment-page .aobo-hero::after { content: none !important; }\n  .entry-content[class] .aobo-hero h1,\n  .aobo-o2-tool-steel-heat-treatment-page .aobo-hero h1 {\n    font-size: clamp(24px, 2.4vw, 36px) !important; line-height: 1.15 !important;\n    letter-spacing: 0 !important; margin: 0 0 16px !important; text-align: center !important;\n  }\n  .entry-content[class] .aobo-table-wrap,\n  .aobo-o2-tool-steel-heat-treatment-page .aobo-table-wrap,\n  .entry-content[class] .ts-table-wrap { border-radius: 0 !important; }\n  .entry-content[class] figure img,\n  .aobo-o2-tool-steel-heat-treatment-page .aobo-figure img { border-radius: 0 !important; }\n  @media (min-width: 1025px) { .ast-right-sidebar #secondary { margin-top: 64px !important; } }\n<\/style>\n<div class=\"aobo-wrap\">\n<header class=\"aobo-hero\">\n<h1>O2 Tool Steel Heat Treatment Guide<\/h1>\n<p>Heat treatment guidance for O2 tool steel (DIN 1.2842\/JIS SKS31), focusing on wear resistance, machinability, and dimensional stability for cold-work tooling applications.<\/p>\n<\/header>\n<main class=\"aobo-article\">\n<p><a href=\"https:\/\/aobosteel.com\/o2-tool-steel\/\">O2 tool steel<\/a> is an oil-quenched cold work tool steel with high hardness, high wear resistance, and minimal deformation during heat treatment. Compared with water-quenched steel, O2 steel exhibits better dimensional stability and higher toughness after complete quenching\u00a01<sup data-fn=\"6666d472-7e42-4e7d-8427-2b3ef148d636\" class=\"fn\"><a id=\"6666d472-7e42-4e7d-8427-2b3ef148d636-link\" href=\"#6666d472-7e42-4e7d-8427-2b3ef148d636\">1<\/a><\/sup>. The equivalent grades of O2 tool steel include:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Standard<\/th><th>Grade<\/th><\/tr><\/thead><tbody><tr><td>EN\/DIN<\/td><td>1.2842 \/ 90MnCrV8<\/td><\/tr><tr><td>JIS<\/td><td>SKS31<\/td><\/tr><tr><td>GB<\/td><td><a href=\"https:\/\/aobosteel.com\/9mn2v-tool-steel-heat-treatment\/\">9Mn2V<\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 id=\"h-a-quick-checklist-of-o2-tool-steel-heat-treatment\" class=\"wp-block-heading\">A Quick Checklist of O2 Tool Steel Heat Treatment<\/h2>\n\n<div class=\"schema-how-to wp-block-yoast-how-to-block\"><p class=\"schema-how-to-description\">Follow these sequential steps for proper heat treatment of O2 tool steel: preheating, hardening (austenitizing), oil quenching, and tempering.<br><\/p> <ol class=\"schema-how-to-steps\"><li class=\"schema-how-to-step\" id=\"how-to-step-1765333742053\"><strong class=\"schema-how-to-step-name\"><strong>Preheating<\/strong><\/strong> <p class=\"schema-how-to-step-text\">Preheat to 649\u2013677\u00b0C (1200\u20131250\u00b0F) until evenly heated. Reduces thermal shock and the risk of deformation or cracking.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1765333794811\"><strong class=\"schema-how-to-step-name\"><strong>Austenitizing (Hardening)<\/strong><\/strong> <p class=\"schema-how-to-step-text\">Heat to 760\u2013800\u00b0C (1400\u20131472\u00b0F). Alloy carbides dissolve, and the microstructure transforms to austenite.<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1765333800667\"><strong class=\"schema-how-to-step-name\"><strong>Quenching<\/strong><\/strong> <p class=\"schema-how-to-step-text\">Quench in oil. Stop when the workpiece reaches 66\u201393\u00b0C (150\u2013200\u00b0F).<\/p> <\/li><li class=\"schema-how-to-step\" id=\"how-to-step-1765333801451\"><strong class=\"schema-how-to-step-name\"><strong>Tempering<\/strong><\/strong> <p class=\"schema-how-to-step-text\">Begin immediately once the workpiece cools to 52\u201365\u00b0C (125\u2013150\u00b0F). Temper at 150\u2013260\u00b0C (300\u2013500\u00b0F). Minimum soak: 2 hours per inch (4.7 min\/mm) of cross-section.<\/p> <\/li><\/ol><\/div>\n\n<h2 class=\"wp-block-heading\">Heat Treatment Process<\/h2>\n\n<h3 class=\"wp-block-heading\">Preheating<\/h3>\n\n<p>Preheat to 649\u2013677\u00b0C (1200\u20131250\u00b0F) and hold until the workpiece is uniformly heated throughout. This reduces thermal shock and the risk of deformation or cracking when the steel enters the austenitizing furnace.<\/p>\n\n<h3 class=\"wp-block-heading\">Austenitizing<\/h3>\n\n<p>Heat to 760\u2013800\u00b0C (1400\u20131472\u00b0F). At this temperature, alloy carbides dissolve and the microstructure transforms to austenite. 790\u00b0C (1450\u00b0F) is the recommended standard temperature for most applications. Control soak time carefully \u2014 excessive soaking raises retained austenite content and reduces final hardness.<\/p>\n\n<h3 class=\"wp-block-heading\">Quenching<\/h3>\n\n<p>Quench in oil, stopping when the workpiece reaches 66\u201393\u00b0C (150\u2013200\u00b0F). Maintain quenching oil temperature between 50\u201370\u00b0C (120\u2013160\u00b0F). Do not use water or brine \u2014 the risk of cracking is severe. Do not wrap in stainless foil, as it impedes oil contact.<\/p>\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"765\" src=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/01\/O2-Tool-Steel-Isothermal-Transformation-Diagram.avif\" alt=\"O2 Tool Steel Isothermal Transformation Diagram\" class=\"wp-image-11939\" srcset=\"https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/01\/O2-Tool-Steel-Isothermal-Transformation-Diagram.avif 1024w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/01\/O2-Tool-Steel-Isothermal-Transformation-Diagram-300x224.avif 300w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/01\/O2-Tool-Steel-Isothermal-Transformation-Diagram-768x574.avif 768w, https:\/\/aobosteel.com\/wp-content\/uploads\/2026\/01\/O2-Tool-Steel-Isothermal-Transformation-Diagram-16x12.avif 16w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">O2 Tool Steel Isothermal Transformation Diagram<\/figcaption><\/figure>\n\n<h3 class=\"wp-block-heading\">Tempering<\/h3>\n\n<p>Begin tempering immediately once the workpiece cools to 52\u201365\u00b0C (125\u2013150\u00b0F) \u2014 do not allow it to reach room temperature first. Temper at 150\u2013260\u00b0C (300\u2013500\u00b0F). Minimum soak time: 2 hours per inch (4.7 min\/mm) of cross-section, followed by air cooling.<\/p>\n\n<p>For demanding applications, double tempering is preferred. For most tooling, a single temper at 175\u2013205\u00b0C (345\u2013400\u00b0F) achieves a working hardness of 58\u201362 HRC.<\/p>\n\n<p><strong>Hardness vs. tempering temperature:<\/strong><\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Tempering Temperature \u00b0C (\u00b0F)<\/th><th>Hardness (HRC)<\/th><\/tr><\/thead><tbody><tr><td>150 (300)<\/td><td>62.5<\/td><\/tr><tr><td>205 (400)<\/td><td>59.5<\/td><\/tr><tr><td>260 (500)<\/td><td>56.5<\/td><\/tr><tr><td>315 (600)<\/td><td>54.0<\/td><\/tr><tr><td>370 (700)<\/td><td>52.0<\/td><\/tr><tr><td>425 (800)<\/td><td>49.5<\/td><\/tr><tr><td>480 (900)<\/td><td>46.0<\/td><\/tr><tr><td>540 (1000)<\/td><td>41.5<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h2 class=\"wp-block-heading\">Common Issues and Solutions<\/h2>\n\n<h3 class=\"wp-block-heading\">Deformation and Dimensional Changes<\/h3>\n\n<p>Deformation in O2 steel is usually caused by excessive quench rates or uneven heating. Three controls:<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>Martempering:<\/strong> Interrupt the quench in hot oil or molten salt, held at 14\u201328\u00b0C (25\u201350\u00b0F) above the martensite start temperature (Ms), hold until the workpiece temperature equalizes, then air-cool.<\/li>\n\n<li><strong>Preheating:<\/strong> Preheating to 650\u00b0C (1200\u00b0F) before austenitizing significantly reduces distortion during hardening.<\/li>\n\n<li><strong>Machining allowance:<\/strong> Retain sufficient stock after rough machining to correct any distortion from final heat treatment.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">Quench Cracking<\/h3>\n\n<p>Causes include excessive heating rates, sharp corners, and abrupt changes in cross-section in the tool geometry.<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Oil quench only. Water and brine are prohibited.<\/li>\n\n<li>Temper the workpiece before it fully cools to room temperature to relieve residual stress.<\/li>\n\n<li>For complex geometries, perform stress-relief annealing at 650\u2013675\u00b0C after rough machining and before final hardening.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">Surface Decarburization<\/h3>\n\n<p>O2 steel is sensitive to decarburization during heating. Carbon loss at the surface produces a soft layer that reduces wear resistance.<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Heat in a protective atmosphere \u2014 an <a href=\"https:\/\/aobosteel.com\/protective-atmosphere-selection-tool-steel\/\">endothermic gas<\/a>, a salt bath, or a vacuum.<\/li>\n\n<li>Remove all oxide scale and any existing decarburized layer from the surface before final heat treatment.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">Retained Austenite and Hardness Control<\/h3>\n\n<p>Austenitizing above the recommended temperature raises retained austenite content, leading to insufficient hardness and dimensional instability after quenching.<\/p>\n\n<ul class=\"wp-block-list\">\n<li>Stay within the 760\u2013800\u00b0C range. Exceeding this is the primary cause of retained austenite problems.<\/li>\n\n<li>Cryogenic treatment at \u2212196\u00b0C (\u2212321\u00b0F) converts a significant portion of retained austenite to martensite.<\/li>\n\n<li>Temper at 175\u2013205\u00b0C (345\u2013400\u00b0F) to reach a stable working hardness of 58\u201362 HRC.<\/li>\n<\/ul>\n\n<h3 class=\"wp-block-heading\">Application Limits<\/h3>\n\n<p>O2 steel has no red hardness. It is suitable for cold stamping, shearing, and forming at ambient temperatures. It must not be used in hot-work applications such as die casting or hot forging.<\/p>\n<\/main>\n<\/div>\n<style id=\"aobo-hero-plain\">\n  \/* \u8f7b\u6539\u7248\u6807\u51c6\uff1ahero \u53bb\u65b9\u6846 \u00b7 H1 \u4e00\u884c\u5c45\u4e2d \u00b7 \u8868\u683c\u4e0e\u56fe\u7247\u53bb\u5706\u89d2 \u00b7 \u4fa7\u680f\u4ece H1 \u4e0b\u65b9\u5f00\u59cb *\/\n  .entry-content[class] .aobo-hero,\n  .aobo-o2-tool-steel-heat-treatment-page .aobo-hero {\n    background: none !important; border: 0 !important; border-radius: 0 !important;\n    box-shadow: none !important; overflow: visible !important;\n    padding: 0 !important; margin: 0 0 20px !important;\n  }\n  .entry-content[class] .aobo-hero::after,\n  .aobo-o2-tool-steel-heat-treatment-page .aobo-hero::after { content: none !important; }\n  .entry-content[class] .aobo-hero h1,\n  .aobo-o2-tool-steel-heat-treatment-page .aobo-hero h1 {\n    font-size: clamp(24px, 2.4vw, 36px) !important; line-height: 1.15 !important;\n    letter-spacing: 0 !important; margin: 0 0 16px !important; text-align: center !important;\n  }\n  .entry-content[class] .aobo-table-wrap,\n  .aobo-o2-tool-steel-heat-treatment-page .aobo-table-wrap,\n  .entry-content[class] .ts-table-wrap { border-radius: 0 !important; }\n  .entry-content[class] figure img,\n  .aobo-o2-tool-steel-heat-treatment-page .aobo-figure img { border-radius: 0 !important; }\n  @media (min-width: 1025px) { .ast-right-sidebar #secondary { margin-top: 64px !important; } }\n<\/style>\n<\/section>\n\n","protected":false},"excerpt":{"rendered":"<p>O2 Tool Steel Heat Treatment Guide Heat treatment guidance for O2 tool steel (DIN 1.2842\/JIS SKS31), focusing on wear resistance, machinability, and dimensional stability for cold-work tooling applications. O2 tool steel is an oil-quenched cold work tool steel with high hardness, high wear resistance, and minimal deformation during heat treatment. Compared with water-quenched steel, O2 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"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":"default","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":"[{\"content\":\"Nee, J. G. (Chief Technical Reviewer &amp; Managing Editor). (2010). <em>Fundamentals of Tool Design<\/em> (6th ed.). Society of Manufacturing Engineers.\",\"id\":\"6666d472-7e42-4e7d-8427-2b3ef148d636\"}]"},"class_list":["post-11734","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.7 (Yoast SEO v28.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>O2 Tool Steel Heat Treatment Guide - AoboSteel<\/title>\n<meta name=\"description\" content=\"Complete O2 tool steel heat treatment guide: austenitize at 760\u2013800\u00b0C, oil quench, temper to 58\u201362 HRC. 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