P20
STANDARDS : 40CRMNNIMO8-6-4
P20
DIN 2311
AISI P20
AFNOR Z210CW12-01
| C 0.38 | Mn 1.40 | Cr 1.85 | Mn 0.20 |
Steel Properties
P20 is the Pre Hardened Plastic mould steel hardness distributed evenly in large cross sections that have excellent weldability with least hardness elevation, good mirror polishability and less streak texture making finishing easier. Size Section availability upto 255mm thickness. Supply hardness is 240-280 BHN.
Physical Properties
| Coefficient of thermal expansionat °C | 20-100 | 20-150 | 20-200 | 20-250 | 20-300 | 20-350 | 20-400 | 20-450 | 20-500 |
|---|---|---|---|---|---|---|---|---|---|
| 10-6 m/(m*K) | 12.7 | 12.8 | 13.1 | 13.3 | 13.6 | 13.7 | 13.8 | 14.0 | 14.3 |
| Thermal Conductivity °C | 23 | 150 | 300 | 350 | 400 | 500 |
|---|---|---|---|---|---|---|
| W/(m*K)Annealed | 32.0 | 32.8 | 31.4 | 30.2 | 29.6 | 27.5 |
Application
Plastic mould steel equivalent to DIN 2311 use for die holders, zinc die, casting dies, backers, bolsters, injection moulds, mould frames for plastic moulds, Shoe Blocks, pressure casting moulds, recipient sleeves Etc.
Heat Treatment
| Soft annealing °C | Cooling | Hardness HB |
|---|---|---|
| 710 – 740 | Furnace | max. 235 |
| Hardening °C | Quenching | Hardness after quenching HRC |
|---|---|---|
| 850 – 880 | Oil or saltbath, 180 – 220 °C | 52 |
| Tempering °C after Quenching | 100 | 200 | 300 | 400 | 500 | 600 | 700 |
|---|---|---|---|---|---|---|---|
| HRC | 52 | 50.5 | 48.5 | 46 | 42 | 36.5 | 28 |
