{"id":11927,"date":"2026-01-04T09:23:04","date_gmt":"2026-01-04T01:23:04","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=11927"},"modified":"2026-01-29T00:13:30","modified_gmt":"2026-01-28T16:13:30","slug":"h11-tool-steel-heat-treatment","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/es\/h11-tool-steel-heat-treatment\/","title":{"rendered":"Gu\u00eda de tratamiento t\u00e9rmico del acero para herramientas H11"},"content":{"rendered":"\n
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Home<\/mark> <\/a>> Tool Steel Heat Treatment Technical Center<\/mark> <\/a> > H11 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

H11 Tool Steel Heat Treatment Guide<\/h1>

Heat treatment guidance for H11 tool steel, focusing on balanced toughness, thermal stability, and reliable performance in hot-work tooling applications.<\/p><\/div>\n\n\n\n

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H11 Material Specifications<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n
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The purpose of H11 tool steel<\/a> heat treatment is to transform the soft, annealed microstructure, consisting mainly of ferrite and alloy carbides, into a hardened and tempered martensitic structure with beneficial carbides that provide the desired cutting or working properties. This multi-stage process typically involves preheating, hardening, quenching, and tempering.<\/p>\n\n\n\n

So, what is H11 tool steel? H11 is a popular 5% chromium hot-work tool steel. It is widely used in high-temperature applications such as die casting molds, hot rolling, hot extrusion, and hot forging, as well as in structural components for aerospace applications, such as helicopter rotor shafts.<\/p>\n\n\n\n

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A quick checklist of H11 tool steel heat treatment<\/h2>\n\n\n\n

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

The heat treatment of H11 involves a sequence of annealing<\/a>, stress relieving, austenitizing<\/a> (hardening), quenching, and tempering<\/a> to achieve the desired metallurgical properties.
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  1. Preparation and Annealing<\/strong><\/strong>

    Heat slowly to 845\u2013900 \u00b0C (1550\u20131650 \u00b0F) while protecting with controlled atmospheres or inert packing. Cool in the furnace to 480 \u00b0C (900 \u00b0F) at ~22 \u00b0C (40 \u00b0F) per hour, then air-cool.<\/p> <\/li>

  2. Stress Relieving<\/strong><\/strong>

    Heat to 650\u2013730 \u00b0C (1200\u20131350 \u00b0F) or 500\u2013600 \u00b0C. Hold for a minimum of 2 hours or 0.5 hours per inch of the largest section, then cool slowly in still air.<\/p> <\/li>

  3. Austenitizing<\/strong><\/strong>

    Preheat to 760\u2013815 \u00b0C (1400\u20131500 \u00b0F). Heat to 995\u20131040 \u00b0C (1825\u20131900 \u00b0F) using vacuum furnaces, salt baths, or endothermic atmospheres. Soak for 15\u201340 minutes.<\/p> <\/li>

  4. Quenching<\/strong><\/strong>

    Cool in still air to room temperature. For large sections, use air blast or interrupt oil quench at 595\u2013650 \u00b0C (1100\u20131200 \u00b0F) or when the surface is black, then air cool. Do not water quench.<\/p> <\/li>

  5. Tempering<\/strong><\/strong>

    Temper immediately when the part reaches 50\u201365 \u00b0C (120\u2013150 \u00b0F). Heat to 540\u2013650 \u00b0C (1000\u20131200 \u00b0F). Hold for 1 hour per inch (minimum 2 hours), air cool, and repeat.<\/p> <\/li><\/ol><\/div>\n<\/div>\n\n\n\n

    1. Preheating and Stress Relieving<\/h2>\n\n\n\n

    Preheating serves three functions: reducing thermal shock (which can cause distortion or cracking), increasing equipment productivity by reducing high-heat furnace time, and minimizing carburization\/decarburization when the high-heat furnace atmosphere is not neutral.<\/p>\n\n\n\n

    The preheating temperature for H11 is 650\u00b0C (1200\u00b0F), and it is kept at this temperature for 10-15 minutes. For parts with severe cross-sectional changes, or for large or intricate tools, it’s safer to slowly heat the furnace to the preheat temperature, or place the part on top of the furnace to remove chill before placing it inside. For atmosphere or vacuum heat treatment, a single preheat between 790 and 845 \u00b0C (1450 and 1550 \u00b0F) is typically used1<\/a><\/sup>.<\/p>\n\n\n\n

    Although preheating can relieve some stress, conventional stress relief is more effective. High-temperature tempering of H11 steel can significantly relieve stress. Stress relieving aims to reduce internal stresses that can cause distortion or cracking during subsequent heat treatment or service. A stress-relief temper is highly recommended after substantial machining, grinding, welding, or electrical discharge machining (EDM) operations. The stress relief temperature is generally 14\u201328 \u00b0C (25\u201350 \u00b0F) lower than the previous tempering temperature. The tempering temperature is listed below.<\/p>\n\n\n\n

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

    This is the second critical step, where the steel is heated to a high temperature to dissolve various complex alloy carbides and transform the ferrite-pearlite structure into austenite. The austenitizing temperature range for H11 steel is 995 to 1025\u00b0C (1825 to 1875\u00b0F). Soaking times range from 20 minutes plus an additional 5 minutes for each 25 mm (1 inch) of section thickness. For H13, austenitizing temperatures are generally higher, ranging from 1050 to 1180 \u00b0C (1920 to 2155 \u00b0F). Find more H11 vs H13 steel<\/a>.<\/p>\n\n\n\n

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    H11 tool steel Isothermal Transformation Diagram<\/figcaption><\/figure>\n\n\n\n