{"id":11734,"date":"2026-01-04T11:32:34","date_gmt":"2026-01-04T03:32:34","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=11734"},"modified":"2026-04-26T00:17:56","modified_gmt":"2026-04-25T16:17:56","slug":"o2-tool-steel-heat-treatment","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/es\/o2-tool-steel-heat-treatment\/","title":{"rendered":"Gu\u00eda de tratamiento t\u00e9rmico del acero para herramientas O2"},"content":{"rendered":"\n
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Home<\/mark> <\/a>> Tool Steel Heat Treatment Technical Center<\/mark> <\/a> > O2 Tool Steel Heat Treatment Guide<\/h6><\/div>\n\n\n\n

Aobo Steel | Global Tool Steel Supplier in China<\/em><\/h4><\/div>\n\n\n\n

O2 Tool Steel Heat Treatment Guide<\/h1>

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><\/div>\n\n\n\n

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O2 Material Specifications<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n
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O2 tool steel<\/a> heat treatment is crucial to achieving optimal performance. O2 tool steel is an oil-quenched cold work tool steel with high hardness, high wear resistance, and minimal deformation during heat treatment. Compared to water-quenched steel, O2 steel exhibits better dimensional stability and higher toughness after complete quenching1<\/a><\/sup>. The equivalent grades of O2 tool steel include:<\/p>\n\n\n\n

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  1. Europe (EN\/DIN): 1.2842 or 90MnCrV8.<\/li>\n\n\n\n
  2. Japan (JIS): SKS31<\/li>\n\n\n\n
  3. China (GB): 9Mn2V<\/li>\n<\/ol>\n\n\n\n

    A Quick Checklist of O2 Tool Steel Heat Treatment<\/h2>\n\n\n\n

    Tiempo necesario: <\/span>1 d\u00eda<\/p>

    Follow these sequential steps for proper heat treatment of O2 tool steel: preheating, hardening (austenitizing), oil quenching, and tempering.<\/p>

    1. Preheating<\/strong><\/strong>

      Preheat the O2 material to 649-677\u00b0C (1200-1250\u00b0F)<\/strong> until it is evenly heated. This essential process helps relieve stress and lowers the risk of deformation or cracking.<\/p> <\/li>

    2. Austenitizing (Hardening)<\/strong><\/strong>

      Heat the steel to the austenitizing temperature range of 760 to 800\u00b0C (1400 to 1472\u00b0F)<\/strong>. At this stage, complex alloy carbides dissolve, and the microstructure transforms into austenite.<\/p> <\/li>

    3. Quenching<\/strong><\/strong>

      Rapidly cool the steel, typically using oil quenching<\/strong>, to transform the austenite into the desired hard martensite structure. Stop the quenching process when the material temperature drops to 66-93 \u00b0C (150-200 \u00b0F)<\/strong>.<\/p> <\/li>

    4. Tempering<\/strong><\/strong>

      Begin tempering immediately after the quenching temperature has dropped to 52-65\u00b0C (125-150\u00b0F). Temper the O2 steel between 150 \u00b0C and 260 \u00b0C (300 \u00b0F to 500 \u00b0F)<\/strong>. The soak time must be at least 2 hours per inch (4.7 minutes per millimeter) of cross-section<\/strong>.<\/p> <\/li><\/ol><\/div>\n\n\n\n

      Preheating<\/h2>\n\n\n\n

      Almost all tool steels, including O2, require preheating. It helps reduce thermal shock and lowers the risk of deformation or cracking when cold tools are placed in a hot furnace. It can also relieve stress during the processing of O2 materials and improve furnace production efficiency. Preheat to 649-677\u00b0C (1200-1250\u00b0F) until the O2 material is evenly heated.<\/p>\n\n\n\n

      Austenitizing (Hardening)<\/h2>\n\n\n\n

      The austenitizing temperature range for O2 steel is typically 760 to 800\u00b0C (1400 to 1472\u00b0F). At this temperature, various complex alloy carbides are dissolved, and the microstructure is transformed into austenite. The soaking time at this temperature should be carefully controlled to avoid adverse effects on the molecular structure.<\/p>\n\n\n\n

      Quenching<\/h2>\n\n\n\n

      After austenitizing, the steel is rapidly cooled, typically in oil for O2 tool steel, to transform the austenite into martensite<\/a>, which is the desired hard structure. Oil quenching has a slower cooling rate than water quenching, but it has a lower risk of deformation and cracking. The O2 material should be cooled to a temperature between 66 and 93 \u00b0C (150 and 200 \u00b0F) before proceeding to the tempering step. Unlike air-hardening steel, oil-quenched tool steel is not typically wrapped in stainless steel foil during quenching, as the foil would impede the oil quench.<\/p>\n\n\n\n

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      O2 Tool Steel Isothermal Transformation Diagram<\/figcaption><\/figure>\n\n\n\n