2738 should be preferred in molds where the hardness is required to be
almost at the same level until the core and for better gloss properties.
They are plastic mold steels delivered in pre-hardened condition. 2312 is preferred for
better machinability. 2312 is not suitable for patterning due to its sulfur content.
Suitable for nitration, induction and flame hardening.
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 |
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 |
