P-20+Ni

P-20+Ni Grade Introduction:

DIN 1.2738 steel is one kind of plastic mold steel, equivalent to AISI P20+Ni Tool Steel. While Nickel, chromium, and molybdenum are the alloying elements for hardness and toughness. 1.2738 tool steel is specially designed for the plastic mold industry, especially for big steel mold parts.

  • DIN 1.2738 tool steel is usually supplied as pre-hardened/quenched and tempered 280 – 320 HB hardness condition.
  • With good machinability, DIN 1.2738 steels are with better polishability compared to 1.2312 (AISI P20+S).
  • Material 1.2738 can be through nitrogenation and flame hardening treatment in order to increase the hardness and wearability of the mold surface.

P-20+Ni Grade Application:

  • Die-casting dies
  • Injection molds
  • Synthetic plastic molds
  • Large plastic molds with high core stress
  • Hydroforming tools

P-20+Ni Equivalent Grades:

Country German USA
Standard DIN EN ISO 4957 ASTM/AISI
Grades 1.2738 P20+Ni

P-20+Ni Chemical Composition:

DIN ISO 4957 C Mn P S Si Cr W Mo Ni
1.2738 0.35-0.45 1.30-1.60 0.03 0.03 0.20-0.40 1.80-2.10 – 0.15-0.25 0.90-1.20
ASTM/AISI C Mn P S Si Cr W Mo Ni
P20+Ni 0.28-0.40 0.60-1.00 0.03 0.03 0.20-0.80 1.40-2.00 0.30 0.55 0.90-1.20

Mechanical Properties:

Temperature 20℃ 200℃ 400℃
Tensile strength 1100 MPa 1050 MPa 850 MPa
Yield strength 980 MPa 925 MPa 770 MPa
Section shrinkage 49% 51% 52%
Elongation 13% 14% 16%
Impact toughness (≥) 20 J/cm 32 J/cm 42 J/cm

Physical Properties:

Property Value
Modulus of elasticity [103 x N/mm2] 205
Density [g/cm3] 7.80
Thermal conductivity [W/m.K] 29.0
Specific heat capacity [J/g.K] 0.46
Strength ≈ 1080 N/mm²
Thermal Conductivity at 100 °C 33.5 W/m K

Thermal Properties:

Property Value
Thermal conductivity [W/m.K] 29.0
Thermal Conductivity at 100 °C 33.5 W/m K

Forging Properties:

Hot forming temperature: 1093-898 °C.

Stress Relieving:

Approx 650°C

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