Available Shapes
1.2312 Tool Steel
DIN 1.2312 steel is a high-quality plastic mold steel material. Steel 1.2312 is material produced by add about 0.08% sulfur on material 1.2311. The S element improves the free-cutting ability of 1.2311 steel. 2312 material is usually delivered in pre-hardness condition and hardness 28~34HRC.
ASTM P20+S steel is equivalent to DIN 1.2312 material. Generally, 40CrMnMoS8-6/1.2312 and P20+S mold steel will have the same properties for final application. With its higher sulphur content it offers better machineability than 1.2311 plastic mould tool steel grade.
Applications
Analysis
Forging
Stress Relieving
Annealing
Hardening
Tampering
Applications
plastic mould steel is ideally suited for the production of plastic moulds. Typical applications include die holders, zinc die casting dies, backers, bolsters and injection moulds. The versatility of plastic mould steel with its high tensile characteristics enables uses for a variety of other applications such as shafts, rails and wear strips
Analysis
| Carbon | 0.35-0.45% | Chromium | 1.80-2.00% |
| Manganese | 1.40-1.60% | Molybdenum | 0.15-0.25% |
| Sulphur | 0.05-0.10% | Silicon | 0.30-0.50% |
| Phosphorous | 0.03% max |
Forging
1.2312 plastic mould steel are forged at 1093°C (2000°F) down to 899°C (1650°F). Forging below 871°C (1600°F) is not recommended for these steels.
Stress Relieving
When dies are heavily machined, we recommend stabilising just before finish machining in order to relieve machining strains. Heat to 460-500°C. Soak well and allow to cool in the air.
Annealing
Annealing takes place at 760-788°C (1400 to 1450°F) and then the steels are cooled slowly in the furnace at a temperature less than 4°C (40°F) per hour.
Hardening
Heat the steel uniformly to 820-840°C until heated through. Quench in oil.
Tampering
Heat uniformly and soak at the tempering temperature for at least one hour per 25mm of section. Allow to cool in still air.
| Temperature [°C] | 100 | 200 | 300 | 400 | 500 | 600 |
| Hardness [HRc] | 51 | 50 | 48 | 46 | 42 | 36 |
| Tensile [N/mm²] | 1730 | 1670 | 1570 | 1480 | 1330 | 1140 |
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