P20+S | 1.2312 |
1.2312 (40CrMnMoS8-6, ≈P20+S) is a sulfur-modified pre-hardened plastic mould steel. The addition of sulfur improves its machinability for higher efficiency in milling and drilling, while polishability is limited. It has good hardenability and uniform hardness over sections.
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 |
| 1.2312 | 40CrMnMoS8-6 | P20+S | – |
Chemical Composition(wt%)
| C | Si | Mn | P | S | Cr | Mo |
| 0.35~0.45 | 0.30~0.50 | 1.40~1.60 | ≤0.03 | ≤0.05~0.10 | 1.80~2.00 | 0.15~0.25 |
Physical Properties
Density：7.83 g/cm³
Modulus of Elasticity: 210 GPa
Thermal Conductivity: 33.3 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 | 13.1 | 13.5 | 14.0 |
Heat Treatment Process
Hardening: Heat the steel evenly to 830–870°C until the whole section reaches temperature. Then quench in oil to cool.
Annealing: Heat the steel to 760–780°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 | 45 |
Application Fields
Tools for plastics processing and mould for pressure die casting.
Disclaimer: the information and data presented herein are typical values for reference and are not intended as warranties to readers.
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