1.2311 | P20 | 3Cr2Mo
1.2311 steel, German mold steel, alloyed and pre-toughened tool steel, especially suitable for polishing and nitriding; high dimensional stability. 1.2311 tool steel is a mould material for plastic injection, it belongs to the high-quality medium carbon-hardness(28~34HRc), Cold work plastic mould steel. It no need further heat treatment. 1.2311 steel is most widely used to plastic mold material in injection plastic mould.
Description
1.2311 Chemical Composition
| Standard | Grade | C | Mn | P | S | Si | Cr | Mo |
| AISI | P20 | 0.28-0.40 | 0.60-1.00 | ≤0.030 | ≤0.030 | 0.20-0.80 | 1.40-2.00 | 0.30-0.55 |
| DIN | 1.2311 | 0.35-0.45 | 1.30-1.60 | ≤0.030 | ≤0.030 | 0.20-0.40 | 1.80-2.10 | 0.15-0.25 |
| GB | 3Cr2Mo | 0.28-0.40 | 0.60-1.00 | ≤0.030 | ≤0.030 | 0.20-0.80 | 1.40-2.00 | 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
Stress Relieving
Preheating: Because mold steel 1.2311 steel is sold in a pre-hardened condition, hardening heat treatment is not necessary. When dies are heavily machined, we recommend stress relieving just before finish machining in order to relieve machining strains. Heat to 460-500°C. Soak well and allow to cool in the air.
Hardening
Heat uniformly to 820-840°C until heated through. Quench in oil.
Tempering
Heat uniformly and soak at the tempering temperature for at least one hour per 25mm of section. Allow to cool in still air.
| Temperature [°℃] | 100 | 200 | 300 | 400 | 500 | 600 |
| Hardness [HRC] | 51 | 50 | 48 | 46 | 42 | 36 |
| Tensile [N/mm²] | 1730 | 1670 | 1570 | 1480 | 1330 | 1140 |
Annealing
Heat uniformly to 770-790°C. Soak well, cool slowly in the furnace.
Applications
1.2311 are used for low temperature applications that include injection molds and die casting dies. Typical applications include die holders, zinc die casting dies, backers, bolsters and injection moulds. Also suitable for other applications such as rails, shafts and wear strips.
