1.2312 | P20+S
1.2312 is a pre-hardened sulfur-bearing plastic mold steel that offers excellent machinability for direct use, but with limited polishability.
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(wt%)
| W-Nr | EN | AISI | JIS |
| 1.2312 | 40CrMnMo7 | P20+S | – |
Chemical Composition
| 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（g/cm3)：7.83
Modulus of Elasticity（Gpa): 210
Thermal Conductivity（W/（m.k)): 33.3
| Temperature/℃ | 20-100 | 2-200 | 2-300 | 2-400 |
| Coefficient of Thermal Expansion（×10-6） | 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 (℃) | 20-100 | 2-200 | 2-300 | 2-400 |
| Hardness (HRC) | 11.7 | 13.1 | 13.5 | 14.0 |
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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