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PLASTIC MOULD STEELS
1.2312 (40CrMnMoS8-6)
1.2312 Plastic Mould Steel
1.2312 is a pre-hardened Cr-Mn-Mo steel designed for the plastic mould industry, with special sulphur addition to improve machinability. 1.2311 is a plastic mould steel that can provide a 30% increase in milling speed and 300% increase in drilling speed compared to grade 1.2312.
It is frequently used in applications such as plastic injection mould cores and cavities, extrusion moulds for thermoplastics (PE, PP, PS), thermosetting plastics, transparent melts.
Heat Treatment Information
| Heat Treatment | Temperature °C | Environment | Hardness |
|---|---|---|---|
| Softening Annealing | 710-740 | Oven | 235 HB |
| Stress Relief | 500-550 | Oven | |
| Hardening | 830-870 | Oil-Hot Bath | QT Diagram |
Chemical Composition (%)
| C | Mo | Cr | Mn | S |
|---|---|---|---|---|
| 0.40 | 0.20 | 1.90 | 1.50 | 0.05 |
Physical and Mechanical Properties
| Coefficient of Thermal Expansion (1/Kx10^-6) | Thermal Conductivity (20°C)(W/mK) | Hardness (HRC) | Density (gr/cm³) |
|---|---|---|---|
| 12.1 - 12.7/12.3 - 13.5 | 39.6 | 30-48 | 7.85 |
