{"id":9318,"date":"2025-08-02T09:09:04","date_gmt":"2025-08-02T01:09:04","guid":{"rendered":"https:\/\/aobosteel.com\/?page_id=9318"},"modified":"2026-01-29T01:20:17","modified_gmt":"2026-01-28T17:20:17","slug":"p20ni-steel","status":"publish","type":"page","link":"https:\/\/aobosteel.com\/ko\/p20ni-steel\/","title":{"rendered":"P20+Ni Tool Steel | 1.2738"},"content":{"rendered":"
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Home<\/mark> <\/a>> Tool Steel Catalog<\/mark> <\/u><\/a>> P20+Ni Plastic Mold Steel<\/h6><\/div>\n\n\n\n
Aobo Steel | Global Tool Steel Supplier in China<\/em><\/h5><\/div>\n\n\n\n

AISI P20+Ni Tool Steel | 1.2311 Improved | 1.2738 Pre-Hardened Plastic Mold Steel<\/h2><\/div>\n\n\n\n
\u2713100% UT Tested Quality Assurance<\/h5><\/div>\n\n\n\n
\u2713SEP 1921-82 Class D\/d Guaranteed<\/h5><\/div>\n\n\n\n
\u2713Pre-Hardened Condition<\/h5><\/div>\n\n\n\n
\u2713Surface: Black Scale, Turned, Mill Finish, or Polished<\/h5><\/div>\n\n\n\n
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Quick Inquiry For P20+Ni Material<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div><\/div>\n\n\n\n
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P20+Ni steel is a mirror-finish plastic mold steel developed by enhancing the American P20 steel with the addition of Ni alloy. This steel features high hardenability, excellent polishability, electrical discharge machining (EDM) performance, and texturing properties. Pre-hardened with high purity and uniform structure, it is ideal for high-demand plastic molds, particularly those requiring electrical discharge machining.<\/p>\n\n\n\n

1. The applications of P20+Ni steel<\/h2>\n\n\n\n
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\"Plastic
Plastic Injection Molds<\/figcaption><\/figure>\n\n\n\n
\"mirror-finish
mirror-finish plastic mold<\/figcaption><\/figure>\n<\/figure>\n\n\n\n
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  1. Ideal for manufacturing complex and high-precision plastic molds.<\/li>\n\n\n\n
  2. Suitable for large-scale mirror-finish plastic mold production.<\/li>\n<\/ol>\n\n\n\n

    2. P20+Ni steel chemical composition<\/h2>\n\n\n\n
    Carbon (C)<\/td>Silicon (Si)<\/td>Manganese (Mn)<\/td>Phosphorus (P)<\/td>Sulfur (S)<\/td>Chromium (Cr)<\/td>Molybdenum (Mo)<\/td>Nickel (Ni)<\/td><\/tr>
    0.35 \u2013 0.45<\/td>0.20 \u2013 0.40<\/td>0.60 \u2013 1.60<\/td>\u2264 0.030<\/td>\u2264 0.030<\/td>1.80 \u2013 2.10<\/td>0.15 \u2013 0.25<\/td>0.90 \u2013 1.20<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    3. P20+Ni steel physical properties<\/h2>\n\n\n\n
    Property<\/td>Value<\/td>Unit<\/td><\/tr>
    Density<\/td>7.7 \u2013 7.85<\/td>g\/cm\u00b3<\/td><\/tr>
    Hardness (Pre-hardened)<\/td>280-320<\/td>HB<\/td><\/tr>
     <\/td>~28-32<\/td>HRC<\/td><\/tr>
    Tensile Strength<\/td>850 \u2013 1300<\/td>MPa<\/td><\/tr>
    Yield Strength<\/td>770 \u2013 1000<\/td>MPa<\/td><\/tr>
    Elongation<\/td>13 \u2013 16<\/td>%<\/td><\/tr>
    Impact Toughness<\/td>20 \u2013 42<\/td>J\/cm\u00b2<\/td><\/tr>
    Modulus of Elasticity<\/td>205 \u2013 212 x 10\u00b3<\/td>MPa<\/td><\/tr>
    Thermal Conductivity<\/td> <\/td> <\/td><\/tr>
    * At 20\u00b0C<\/td>29 \u2013 35<\/td>W\/(m\u00b7K)<\/td><\/tr>
    * At 350\u00b0C<\/td>~34<\/td>W\/(m\u00b7K)<\/td><\/tr>
    * At 700\u00b0C<\/td>~33<\/td>W\/(m\u00b7K)<\/td><\/tr>
    Thermal Expansion Coeff.<\/td> <\/td> <\/td><\/tr>
    * 20-100\u00b0C<\/td>11.2 \u2013 12.0 x 10\u207b\u2076<\/td>\/K<\/td><\/tr>
    * 20-200\u00b0C<\/td>12.8 x 10\u207b\u2076<\/td>\/K<\/td><\/tr>
    * 20-300\u00b0C<\/td>13.5 x 10\u207b\u2076<\/td>\/K<\/td><\/tr>
    Critical Temperatures<\/td> <\/td>\u00b0C<\/td><\/tr>
    * Ac1<\/td>720<\/td>\u00b0C<\/td><\/tr>
    * Ac3<\/td>800<\/td>\u00b0C<\/td><\/tr>
    * Ms<\/td>290<\/td>\u00b0C<\/td><\/tr>
    Soft Annealing<\/a> Temp.<\/td>710-740<\/td>\u00b0C<\/td><\/tr>
    Stress Relieving Temp.<\/td>560-600<\/td>\u00b0C<\/td><\/tr>
    Hardening Temperature<\/td>840-880<\/td>\u00b0C<\/td><\/tr>
    Tempering<\/a> Temperature<\/td>100-700<\/td>\u00b0C<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    4. P20+Ni equivalents DIN 1.2738<\/h2>\n\n\n\n

    1.2738 steel is a German super-pre-hardened plastic mold steel, supplied in a pre-hardened condition that eliminates the need for additional heat treatment and allows direct machining into molds. It offers excellent machinability, facilitates cutting and polishing, and undergoes stress-relief annealing and surface nitriding treatment with minimal dimensional and hardness changes. Particularly suitable for plastic mold frames with a thickness greater than 400mm.<\/p>\n\n\n\n

    1.2738 steel chemical composition<\/h3>\n\n\n\n
    Carbon (C)<\/td>Silicon (Si)<\/td>Manganese (Mn)<\/td>Phosphorus (P)<\/td>Sulfur (S)<\/td>Chromium (Cr)<\/td>Molybdenum (Mo)<\/td>Nickel (Ni)<\/td><\/tr>
    0.35 \u2013 0.45<\/td>0.20 \u2013 0.40<\/td>1.30 \u2013 1.60<\/td>\u2264 0.030<\/td>\u2264 0.030<\/td>1.80 \u2013 2.10<\/td>0.15 \u2013 0.25<\/td>0.90 \u2013 1.20<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

    Physical Properties of 1.2738 Steel<\/h3>\n\n\n\n
    Property<\/td>Value<\/td>Unit<\/td><\/tr>
    Density<\/td>7.85<\/td>g\/cm\u00b3<\/td><\/tr>
    Hardness (Pre-hardened)<\/td>280-325<\/td>HB<\/td><\/tr>
    Tensile Strength<\/td>850 \u2013 1100<\/td>MPa<\/td><\/tr>
    Yield Strength<\/td>770 \u2013 980<\/td>MPa<\/td><\/tr>
    Elongation<\/td>13 \u2013 16<\/td>%<\/td><\/tr>
    Impact Toughness<\/td>20 \u2013 42<\/td>J\/cm\u00b2<\/td><\/tr>
    Modulus of Elasticity<\/td>205 x 10\u00b3<\/td>N\/mm\u00b2<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
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    Interested in High-Quality P20+Ni Tool Steel?<\/h2>\n\n\n\n

    Leverage Aobo Steel\u2019s 20+ years of expertise in forged P20+Ni tool steel. Renowned for its excellent polishability, superior toughness, and good machinability, our P20+Ni is ideal for demanding plastic mold applications.<\/p>\n\n\n\n

    Take the Next Step:<\/strong><\/p>\n\n\n\n

    Please fill out the form below to get a personalized quote, detailed specifications, or to consult with our tool steel experts today!<\/p>\n\n\n\n

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