{"id":12011,"date":"2026-01-07T21:08:38","date_gmt":"2026-01-07T13:08:38","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=12011"},"modified":"2026-04-26T00:08:03","modified_gmt":"2026-04-25T16:08:03","slug":"l6-tool-steel-heat-treatment","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/es\/l6-tool-steel-heat-treatment\/","title":{"rendered":"Gu\u00eda de tratamiento t\u00e9rmico del acero para herramientas L6"},"content":{"rendered":"\n
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Home<\/mark> <\/a>> Tool Steel Heat Treatment Technical Center<\/mark> <\/a> > L6 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

L6 Tool Steel Heat Treatment Guide<\/h1>

Heat treatment guidance for L6(1.2714\/SKT4) tool steel, focusing on high toughness, wear resistance, and reliable performance.<\/p><\/div>\n\n\n\n

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L6 Material Specifications<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n
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AISI L6 is a low-alloy tool steel offering both good toughness and hardenability. This material is commonly used to manufacture machine components, such as mandrels, cams, and chucks, as well as high-strength, high-toughness tools, such as shear blades and forming dies. Despite L6’s favorable hardenability, strict control of the heat treatment process remains essential.<\/p>\n\n\n\n

A Quick Checklist for L6 Tool Steel Heat Treatment<\/h2>\n\n\n\n

Tiempo necesario: <\/span>4 horas<\/p>

A professional guide on the proper heat treatment steps for AISI L6 tool steel, including preheating, austenitizing, oil quenching, and tempering to achieve the optimal balance of toughness and hardness.<\/p>

  1. Preheat<\/strong>ing<\/strong>

    Heat the L6 tool steel slowly and uniformly to a preheat temperature of 1200\u00b0F (650\u00b0C). Allow the material to fully stabilize at this temperature to achieve thermal equilibrium and prevent thermal shock-induced deformation or cracking.<\/p> <\/li>

  2. Austenitiz<\/strong>ing<\/strong>

    Raise the temperature to the recommended range of 1455\u00b0F – 1555\u00b0F (790\u00b0C – 845\u00b0C), aiming for an optimal target of 1525\u00b0F (830\u00b0C). Soak the material for 10 to 30 minutes, depending on the section size, to dissolve carbides and ensure a uniform microstructure.<\/p> <\/li>

  3. Quenching<\/strong>

    Submerge the steel in warm oil and continuously agitate the liquid until the material cools to approximately 125\u00b0F – 150\u00b0F (52\u00b0C – 66\u00b0C). While water quenching is possible for large sections, use oil quenching to minimize dimensional changes and reduce the risk of cracking.<\/p> <\/li>

  4. Transfer Immediately to Tempering<\/strong><\/strong>

    Remove the tooling from the oil and transfer it to the tempering furnace immediately to prevent cracking. Never allow L6 tooling to cool completely to room temperature before initiating the tempering process.<\/p> <\/li>

  5. Tempering<\/strong>

    Heat the steel to the specific temperature that matches your application’s hardness requirements, noting that hardness decreases as temperature increases. Select lower temperatures (300\u00b0F – 400\u00b0F) for wear parts or higher temperatures (700\u00b0F – 800\u00b0F) for high-toughness tools like shear blades.<\/p> <\/li><\/ol><\/div>\n\n\n\n

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

    To prevent deformation or cracking of L6 tool steel, controlled preheating must be performed before raising the temperature to the final hardening temperature. This ensures that the L6 tool steel reaches thermal equilibrium and reduces the risk of thermal shock from rapid heating. L6 steel should be heated slowly and uniformly. A preheat temperature of 1200\u00b0F (650\u00b0C) is recommended. Once the L6 tool steel has fully stabilized at this temperature, proceed to the subsequent austenitizing step.<\/p>\n\n\n\n

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

    After preheating is complete, raise the temperature to the austenitizing temperature to dissolve carbides and refine the microstructure, preparing for subsequent martensitic transformation. Recommended austenitizing temperature: 1455\u00b0F-1555\u00b0F (790\u00b0C-845\u00b0C), with an optimal target temperature of 1525\u00b0F (830\u00b0C). Soaking time: 10-30 minutes, depending on section size. This ensures thorough heating and uniform microstructure in L6 tool steel while preventing coarse-grain formation.<\/p>\n\n\n\n

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

    Large sections of L6 tool steel can be water-quenched, but oil quenching<\/a> is preferred to minimize dimensional changes and the risk of cracking. Use warm oil as the quenching medium, continuously agitating the oil until the L6 tool steel cools to approximately 125\u00b0F to 150\u00b0F (52\u00b0C to 66\u00b0C). Immediately transfer it to the tempering furnace to prevent cracking.<\/p>\n\n\n\n

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    \"L6
    0.75% C, 0.60% Mn, 0.80% Cr, 1.25% Ni, 0.25% Mo, and 0.15% V, Source: Roberts, G., Krauss, G., and Kennedy, R., Tool Steels<\/em>, 5th ed., ASM International, 1998<\/figcaption><\/figure>\n\n\n\n