DIN 1.2312 steel is a high quality plastic mold steel material. Steel 1.2312 is material produced by add about 0.08% sulphur on material 1.2311. The S element improves free cutting ability of 1.2311 steel. DIN 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.
1. Supply Range of 1.2312 Material
Round Bar: diameter 20mm – 500mm
Steel Plate and Steel Block: thickness 12-300mm x width 200-2300mm (*20-120mm plate in stock in prehardened condition)
Surface Finish: Black Surface, Roughly Machined, Peeled & Turned or as per given requirements.
2. Relevant DIN 1.2312 Steel Specification and Equivalent Steel Grades
| Country | German | USA |
| Standard | DIN EN ISO 4957 | ASTM/AISI |
| Grades | 1.2312 | P20+S |
3. DIN 1.2312 Material Chemical Composition and Equivalent
| DIN ISO 4957 | C | Mn | P | S | Si | Cr | Mo | |||||
| 1.2312 | 0.35 | 0.45 | 1.30 | 1.60 | 0.03 | 0.05-0.1 | 0.20 | 0.40 | 1.80 | 2.10 | 0.15 | 0.25 |
| ASTM A681 | C | Mn | P | S | Si | Cr | T | |||||
| P20+S | 0.28 | 0.40 | 0.60 | 1.00 | 0.03 | 0.03 | 0.20 | 0.80 | 1.40 | 2.00 | 0.30 | 0.55 |
4. DIN 1.2312 Plastic Mold Steel Properties
- Density: 7.84 g/cm3
- Linear expansion coefficient: 12.4 *10-6m/(m*K)
- Thermal conductivity: 34 W/(m*K)
- Hardness (in soft annealed condition): < 235 HB
- Hardness (in hardened and tempered condition): < 51 HRC
5. Forging of 2312
Hot forming temperature: 1100-850 °C.
6. Heat Treatment of Plastic Mold Steel 1.2312
- Grade: 40CrMnMoS8-6
- Material No. W-Nr.: 1.2312
- Hot working temperature / C: 1050 ~ 850
- Annealing temperature / C: 780 ~ 760
- After annealing, the hardness is less than or equal to 230 HBS
- Quenching temperature / C: 830 ~ 870
- Cooling medium: Oil
- Common tempering temperature / C: 640 ~ 680
- Hardness after tempering HRC|100 C: 51
- Hardness after tempering HRC|200 C: 50
- Hardness after tempering HRC|300 C: 48
- Hardness after tempering HRC|400 C: 45
7. Applications of 1.2312 Materials
DIN 1.2312 is good for plastic injection moulds for thermoplastics, extrusion dies for thermoplastic, compression molds application. Tools for plastics processing and moulds for pressure die casting.
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