40CrMnMo7/AISI: P20
Delivery Method : Hardened and tempered 280-325 HB
Usage Areas : It is used in core molds in plastic molds, mold holder and extrusion press casings in plastic and metal injection molds. It has high polishability. It can be subjected to nitriding to increase the surface hardness. It is suitable for chrome plating. It shows uniform hardenability in molds up to 400 mm in size. It can be hardened uniformly in smaller sections.
| Chemical Composition (%) | C | Mn | Cr | Mo | | % Average | 0,40 | 1,50 | 1,90 | 0,20 | DIN Analysis
| 0,35-0,45 | 1,30-1,60 | 1,80-2,10 | 0,15-0,25 |
|
| Thermal Conductivity ( W/ m.K ) | 100°C | 200°C | 300°C | | 34,0 | 33,6 | 31,9 |
|
HEAT TREATMENT DATA
| | | Temperature (°C) | Time (Hours) | Cooling Environment
| Softening Annealing
| 700-75 | 2-5* | Bake
| Stress Relieving
| 550-650 | 2* | Bake
| Hardening
| 830-870 | - | Oil, hot bath 180-220°C | Tempering
| 600-680 | 1 hour for every 20 mm
| Air
|
|
*Time interval varying depending on the section.
