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GB 3Cr2Mo | DIN 1.2311 | ASTM P20 Plastic Mould Steel

Port: Hu nan

engineering steel, cold work tool steel, hot work tool steel, plastic mold steel, spring steel, high speed steel, stainless steel

Alloy Structural Steel, Alloy Tool Steel, Carbon Structural Steel, Carbon Tool Steel, Bearing Steel, Spring Steel ,Stainless Steel, Refractory Steel, Roll Steel, Pinion Steel. Additionally, the company also has the capacity to forge round steel, steel flat, square steel, module, shaft and roller


  • Quick Details

    1: P20 steel introduction

        AISI P20 Steel Plate Material is a versatile, low-alloy tool steel that is characterized by good toughness at moderate strength levels. The special purpose mold steel P20 steel plate is commonly used for plastic injection mold cavities and tooling and for die casting dies for zinc. P20 mold steel plate material is typically sold in the pre-hardened condition at a hardness of approximately 300 HBW.

    2: P20 Steel equivalent
    Country USA German GB/T
    Standard ASTM A681 DIN EN ISO 4957 GB/T 1299
    Grade P20 1.2311 3Cr2Mo
    3: P20 steel chemical composition
    Grade C Si Mn P S Cr Mo
    P20 0.28-0.4 0.2-0.8 0.6-1 0.03 0.03 1.4-2 0.3-0.55
    1.2311 0.35-0.45 0.2-0.4 1.3-1.6 0.03 0.03 1.8-2.1 0.15-0.25
    3Cr2Mo 0.28-0.4 0.2-0.8 0.6-1 0.03 0.03 1.4-2 0.3-0.55
    4: P20 steel mechanical properties  

        The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.

    5: P20 steel overviews

    Size Round Dia 200-1000mm
    Plate/Flat/Block Thickness
    Heat treatment Normalized ; Annealed ; Quenched ; Tempered
    Surface condition Black; Peeled; Polished; Machined; Grinded; Turned; Milled
    Delivery condition Forged; Hot rolled; Cold drawn
    Test Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc. 
    Payment terms T/T;L/C;/Money gram/ Paypal
    Trade terms FOB; CIF; C&F; etc..
    Delivery time 30-45 days

    P20 tool steels are used for low temperature applications that include injection molds and die casting dies. Main applications of P20 steel plate and bar; Plastic moulds, die holder, backers, rames for plastic pressure dies, hydro forming mold tools.bolsters, die holders. Also suitable for other applications such as rails, shafts and wear strips.

    6. Heat Treatment
    Stress Relieving
        Preheating: Because mold steel P20 steel plate is sold in a pre-hardened condition, hardening heat treatment is not necessary. After machining and intermittently during service, the steel must be thermally stress relieved by heating to 900oF (482oC), equalizing and holding for one hour per inch (25.4mm) of thickness, and cooling in air to ambient temperature.
    In those rare circumstances where the AISI steel P20 must be re-hardened, the steel must first be annealed prior to hardening.
        Critical Temperature: Ac1: 1405oF (763oC)
    Preheating of P20 metal: Heat at a rate not exceeding 400oF per hour (222oC per hour) to 1150-1250oF (621-677oC) and equalize.
    Austenitizing (High Heat)
        Heat rapidly from the preheat to 1550oF (843°C). Soak for 30 minutes for first inch (25.4mm) of thickness, plus 15 minutes for each additional inch (25.4mm).
        Pressurized gas, or interrupted oil to 150-125oF (66-51oC).
        For oil, quench until black, at about 900°F (482°C), then cool in still air to 150-125°F (66-51°C).
        P20 tool steels are tempered at 482-593°C (900 to 1100°F) for a Rockwell C hardness of 37 to 28.
        Annealing for AISI P20 tool steels takes place at 760-788°C (1400 to 1450°F) and then the steels are cooled slowly in the furnace at a temperature less than 4°C (40°F) per hour.

    6: Delivery condition
        For hot forged bar, usually the delivery condition is hot forged, annealed/QT rough turned/Black surface.
        For hot rolled bar, usually the delivery condition is hot rolled, annealed/QT, Black surface.
        For hot forged plate, usually the delivery condition is hot forged, annealed/QT, milled surface

        For hot rolled plate, usually the delivery condition is hot rolled, annealed/QT, black surface.