1.2312 | P20+S
1.2312 Plastic mold steel with excellent machinability properties because of the high S content, good toughness properties, good wear resistance, uniform hardness in all dimensions, dimensional stability, requiring no heat treatment, 280-325HB hardened and tempered condition, suitable for nitriding to increase wear resistance, not suitable for chrome plating, polishing and etch graining.
Description
1.2312 Chemical Composition
| Standard | Grade | C | Mn | P | S | Si | Cr | Mo |
| DIN | 1.2312 | 0.35-0.45 | 1.30-1.60 | ≤0.030 | 0.05-0.10 | 0.20-0.40 | 1.80-2.10 | 0.15-0.25 |
| AISI | P20+S | 0.28-0.40 | 0.60-1.00 | ≤0.030 | ≤0.030 | 0.20-0.80 | 1.80-2.00 | 0.30-0.55 |
Supply Range
Surface Finish: Black, Peeled, Machined/Turned or as per given requirements.
Forged Round Bar: 20mm - 650mm (Dia)
Rolled Bars: 12mm - 360mm (Dia)
Forged flats: 30-400mm(T)*500-1200mm(W)
Rolled flats: 10-360mm(T)*30-1020mm(W)
Other sizes of O1 material or as per customer’s requirements.
Heat Treatment
Already pre-toughened; usually no heat treatment required.
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.
Nitriding:
Before nitriding, stress-relief annealing at 580 °C is recommended (Meusburger standard).
Hardening:
Heat uniformly to 830-870°C until heated through. Quench in oil.
Cooling:
Down to 180 °C/220 °C in oil/hot bath
obtainable hardness: 52 HRC
Tempering:
Slow heating to tempering temperature immediately after hardening; then maintain the temperature in the furnace for at least 1 hour per 25 mm part thickness.
Annealing:
Heat uniformly to 710-740°C. Soak well, cool slowly in the furnace.
Applications
1.2312 tool steel is ideally suited for the production of moulds where improved machinability is required. Typical applications include die holders, zinc die casting dies, backers, bolsters and injection moulds.
1.2312 mold steel uses for mould bases and die sets with increased requirements on strength; high-tensile machine parts.
The versatility of this plastic mould tool steel with its high tensile characteristics enables uses for a variety of other applications such as shafts and wear strips.
