Plastic mould steel with additional sulphur, usually supplied in a quenched and
tempered condition. Polishable, better machinibility compared to 1.2311. Similar to AISI P20+S.
They are plastic mold steels delivered in pre-hardened condition. 1.2312 is preferred for better machinability.
Due to its sulfur content, 1.2312 is not suitable for patterning. 1.2738 should be preferred for molds where the
hardness is required to be almost at the same level until the core and for better gloss properties.
It can be processed to the finished size and used immediately
in the production of plastic molds and holders.
It is flame hardenable and suitable for nitration.
Carbon |
Chromium |
Molybdenum |
Manganese |
Sulfur |
C |
Cr |
Mo |
Mn |
S |
0,40 |
1,90 |
0,20 |
1,50 |
0,05 |
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 |
