P20+Ni | 1.2738 | 708HH
1.2738 (40CrMnNiMo8-6-4 / ≈P20+Ni): Pre-hardened plastic mould steel. Nickel enhances hardenability and sectional hardness uniformity for large moulds; good polishability, texture etching property and machinability.
Available Form
Round Bar
Custom Diameter & Length
Flat Bar
Custom Thickness, Width & Length
Square Bar
Custom Width & Length
Steel Plate
Custom Thickness, Width & Length
Steel Grade Comparison
| W-Nr | EN | AISI | JIS |
| 1.2738 | 40CrMnNiMo8-6-4 | P20+Ni | PDS5S |
Chemical Composition(wt%)
| C | Si | Mn | P | S | Cr | Mo | Ni |
| 0.35~0.45 | 0.20~0.40 | 1.30~1.60 | ≤0.03 | ≤0.03 | 1.80~2.10 | 0.15~0.25 | 0.90~1.20 |
Physical Properties
Density：7.85 g/cm³
Modulus of Elasticity: 205 GPa
Thermal Conductivity: 29.0 W/(m.K)
| Temperature | 20-100°C | 2-200°C | 2-300°C | 2-400°C |
| Coefficient of Thermal Expansion(×10-6 /K) | 11.7 | 12.3 | 13.0 | 13.3 |
Heat Treatment Process
Hardening: Heat the steel evenly to 840–870°C until the whole section reaches temperature. Then quench in oil to cool.
Annealing: Heat the steel to 710–740°C, hold it well at temperature, and then let it cool slowly inside the furnace.
Tempering: Heat the steel uniformly, hold it at the selected tempering temperature, and then allow it to cool in still air.
| Tempering Temperature | 100°C | 200°C | 300°C | 400°C |
| Hardness (HRC) | 51 | 50 | 48 | 46 |
Application Fields
Typically used for relatively low temperature applications such as die casting dies and injection molds, synthetic plastic mould dies, for large mould.
Disclaimer: the information and data presented herein are typical values for reference and are not intended as warranties to readers.
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