Prehardened plastic mold steel, also known as P20, prehardened (30-33 HRc) with good machinability and polishability for fast mold making.
Chemical Composition
| NO | DIN | AISI | C | Si | Mn | P | S | Cr | Mo |
|---|---|---|---|---|---|---|---|---|---|
| V’1.2311 | 40CrMnMo7 | P20 | 0,35-0,45 | Max 0,80 | 1,30-1,60 | Max 0,02 | Max 0,005 | 1,80-2,10 | 0,15-0,25 |
Material Properties
- Homogeneous hardness distribution along the cross section up to 300 mm thickness.
- Better Polishability compare to 2312 (P20+S)
- Good weldability.
- High Toughness.
- Good machinability even if it is prehardened.
- The preferred working hardness is the delivery hardness.
- Good nitriding and chrome planting ability.
- Up to A2 Surface quality.
Applications
- Cores and cavities in plastic injection mould
- Small or medium sizes injection molds
- Pressure casting dies
- Mold frames for plastic molds
- Extension dies for thermoplastics
- Dies of light alloys with low melting point
Heat Treatment
| HEAT TREATMENT | TEMPERATURE |
|---|---|
| Soft Annealing | 700-720°C |
| Stress Relieving | 600-650°C |
| Hardening | 870-900°C |
| Tempering | 600-680°C |
Physical Properties
| 20°C | 100°C | 200°C | 300°C | |
|---|---|---|---|---|
| Elastic Modulus [kN/mm²] | 205 | - | - | - |
| Thermal Expansion Coefficient [10ˉ6/K] | - | 11,5 | 11,6 | 12,5 |
| Thermal Conductivity [W/mK] | - | 34,00 | 33,6 | 31,9 | Toughness [J] | 30,5 | - | - | - | Strength [N/mm²] | 844,5 | - | - | - |
Delivery Condition
Prehardened, 280-320 HB
Tempering Graph
