P20 | 1.2311 | 618HH
AISI P20 (1.2311) is a chromium-molybdenum plastic mold steel usually supplied in a pre-hardened condition. It offers good machinability, polishability, and toughness
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 |
| 1.2311 | 40CrMnMo7 | P20 | PDS5 |
Chemical Composition(wt%)
| C | Si | Mn | Cr | Mo |
| 0.28~0.40 | 0.20~0.80 | 0.60~1.00 | 1.40~2.00 | 0.30~0.55 |
Physical Properties
Density：7.85 g/cm³
Modulus of Elasticity: 205 GPa
Thermal Conductivity: 34.0 W/(m.K)
| Temperature | 20-100°C | 2-200°C | 2-300°C | 2-400°C |
| Coefficient of Thermal Expansion(×10⁻⁶ /K) | 11.5 | 11.6 | 12.5 | 12.8 |
Heat Treatment Process
Hardening: Heat the steel evenly to 820~870°C until the whole section reaches temperature. Then quench in oil.
Annealing: Heat the steel to 760~790°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 150~260°C, hardness approx. 64~58HRC
Application Fields
Plastic mould, mould frames for plastic mould, large injection mould, pressure casting dies,recipient sleeves.
Disclaimer: the information and data presented herein are typical values for reference and are not intended as warranties to readers.
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