Plastic mould steel that is usually supplied in a quenched and tempered condition. Good machinability, better polishability, compared to 1.2312 (AISI P20+S). Similar to AISI P20.
1.2311 (40CrMnMo7) steel is a plastic mold steel delivered in its pre-hardened state. For better machinability, 1.2312 (40CrMnMoS8-6) can be preferred. 1.2311 (40CrMnMo7) material is suitable for nitriding, induction hardening, and flame hardening. The only difference between 1.2311 (40CrMnMo7) and 1.2312 materials is the presence of sulfur in 1.2312 (40CrMnMoS8-6). Due to the sulfur content, 1.2312 (40CrMnMoS8-6) plastic mold steel is not suitable for patterning.
For molds requiring uniform hardness throughout the core and products demanding better surface brightness, 1.2738 (40CrMnNiMo8-6-4) should be selected.
Carbon |
Chromium |
Molybdenum |
Manganese |
C |
Cr |
Mo |
Mn |
0,40 |
1,90 |
0,20 |
1,50 |
|
Temperature |
Cooling |
Hardness |
Soft Annealing |
710 - 740 °C |
Furnace |
235 HB |
Stress Relief Annealing |
500 - 550°C |
Furnace |
|
Hardening |
830 - 870°C |
oil or hot bath 180 - 220°C |
see tempering diagram |
Hardness |
30 - 48 |
HRC |
Thermal Expansion Coefficient |
12,1 - 12,7 / 12,3 - 13,5 |
1/K * 10-6 |
Thermal Conductivity (20°C) |
39,6 |
W/mK |
Density |
7,85 |
g/cm3 |
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