1.2738 HH (40CrMnNiMo8-6-4) Tool Steel
1.2738 HH (40CrMnNiMo8-6-4)
Low sulphur plastic mould steel that is usually supplied in a quenched and tempered condition. The additional Ni content improves the through hardenability large dimensions (>400 mm). Good machinability, better polishability compared to 1.2312 (AISI P20+S). Similar to AISI P20+Ni.
Manufactured by Dörrenberg Edelstahl.
Area of Application
Large plastic moulds higly stressed in core, hydroforming tools.
Chemical Composition
Code: 1.2738, MCMN, 40CrMnNiMo8-6-4, P20
Carbon |
Chromium |
Molybdenum |
Manganese |
Nickel |
C |
Cr |
Mo |
Mn |
Ni |
0,40 |
1,90 |
0,20 |
1,50 |
1,00 |
Heat Treatment
|
|
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 |
Mechanical Properties
Hardness |
30 - 48 |
HRC |
Physical Properties
Thermal Expansion Coefficient |
11,8 - 13,3 |
1/K * 10-6 |
Thermal Conductivity (20°C) |
39,5 |
W/mK |
Density |
7,85 |
g/cm3 |
