| Equivalent grades |
GB |
DIN |
AISI |
JIS |
DAIDO |
| 40CrMnMoS8-6 |
1.2312 |
P20+S |
- |
- |
| Chemical Composition |
C |
Si |
Mn |
Cr |
Mo |
S |
P |
V |
W |
Other |
| 0.35-0.45 |
0.30-0.50 |
1.40-1.60 |
1.80-2.00 |
0.15-0.25 |
0.05-0.10 |
0.03MAX |
- |
- |
- |
| Available size |
Round Bar |
Diameter |
Length |
| 60-800mm |
2000-6000mm |
| Flat Bar |
Thickness |
Width |
Length |
| 25-400mm |
200-800mm |
2000-6000mm |
| Surface condition |
Black surface/ Grinded/ Machined |
| Annealed hardness |
235HBS max |
| Characteristics |
1.2312 mould steel with additional sulphur, usually supplied in a quenched and tempered condition. Polishable, better machinability compared to 1.2311 |
| Applications |
plastic moulds, frames for plastic pressure dies, hydroforming tools |
| Heat Treatment |
Soft Annealing |
Heat to 710-740℃, cool slowly in furnace. This will produce a maximum Brinell hardness of 230. |
| Stress Relieving |
Stress relieving to remove machining stresses should be carried out by heating to approx. 650℃, holding for 1-2 hours at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment. |
| Hardening |
Harden from a temperature of 830-880oC followed by oil or quenching or warm bath quenching 180-220℃. Hardness after quenching is 51 HRC. |
| Tempering |
℃ |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
| HRC |
51 |
50 |
48 |
46 |
42 |
36 |
28 |
