P20+Ni Tool Steel | 1.2738

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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.

1. The applications of P20+Ni steel

Plastic Injection Molds
mirror-finish plastic mold

  1. Ideal for manufacturing complex and high-precision plastic molds.

  2. Suitable for large-scale mirror-finish plastic mold production.

2. P20+Ni steel chemical composition

Carbon (C)Silicon (Si)Manganese (Mn)Phosphorus (P)Sulfur (S)Chromium (Cr)Molybdenum (Mo)Nickel (Ni)
0.35 – 0.450.20 – 0.400.60 – 1.60≤ 0.030≤ 0.0301.80 – 2.100.15 – 0.250.90 – 1.20

3. P20+Ni steel physical properties

PropertyValueUnit
Density7.7 – 7.85g/cm³
Hardness (Pre-hardened)280-320HB
 ~28-32HRC
Tensile Strength850 – 1300MPa
Yield Strength770 – 1000MPa
Elongation13 – 16%
Impact Toughness20 – 42J/cm²
Modulus of Elasticity205 – 212 x 10³MPa
Thermal Conductivity  
* At 20°C29 – 35W/(m·K)
* At 350°C~34W/(m·K)
* At 700°C~33W/(m·K)
Thermal Expansion Coeff.  
* 20-100°C11.2 – 12.0 x 10⁻⁶/K
* 20-200°C12.8 x 10⁻⁶/K
* 20-300°C13.5 x 10⁻⁶/K
Critical Temperatures °C
* Ac1720°C
* Ac3800°C
* Ms290°C
Soft Annealing Temp.710-740°C
Stress Relieving Temp.560-600°C
Hardening Temperature840-880°C
Tempering Temperature100-700°C

P20+Ni steel benefits:

  • Easy to machine, cuts production time.
  • Polishes well, great for smooth finishes.
  • Uniform hardness, durable for big molds.
  • Tough, resists cracking under stress.
  • Some corrosion resistance, pre-hardened, saves time.
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4. P20+Ni equivalents DIN 1.2738

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.

1.2738 steel chemical composition

Carbon (C)Silicon (Si)Manganese (Mn)Phosphorus (P)Sulfur (S)Chromium (Cr)Molybdenum (Mo)Nickel (Ni)
0.35 – 0.450.20 – 0.401.30 – 1.60≤ 0.030≤ 0.0301.80 – 2.100.15 – 0.250.90 – 1.20

Physical Properties of 1.2738 Steel

PropertyValueUnit
Density7.85g/cm³
Hardness (Pre-hardened)280-325HB
Tensile Strength850 – 1100MPa
Yield Strength770 – 980MPa
Elongation13 – 16%
Impact Toughness20 – 42J/cm²
Modulus of Elasticity205 x 10³N/mm²

Interested in High-Quality P20+Ni Tool Steel?

Leverage Aobo Steel's 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.

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