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to Properties of steels and cast irons
(submitted by the website administration)
| USA: AISI P20 | ||||
| Chemical composition: C=0.4%, Mn=1.5%, Si=0.4%, Cr=1.9%, Mo=0.2% | ||||
| Property | Value in metric unit | Value in US unit | ||
| Density | 7.81 *10³ | kg/m³ | 487.5 | lb/ft³ |
|---|---|---|---|---|
| Modulus of elasticity | 205 | GPa | 29700 | ksi |
| Thermal expansion (20 ºC) | 12.8*10-6 | ºCˉ¹ | 7.1*10-6 | in/(in* ºF) |
| Specific heat capacity | 460 | J/(kg*K) | 0.11 | BTU/(lb*ºF) |
| Thermal conductivity | 29 | W/(m*K) | 201 | BTU*in/(hr*ft²*ºF) |
| Annealing temperature | 850...900 | ºC | 1560...1650 | ºF |
| Quenching temperature | 860...880 | ºC | 1580...1620 | ºF |
| Tempering temperature | 200...590 | ºC | 390...1100 | ºF |
| Hardness (annealed) | 95 | RB | 95 | RB |
| Hardness (hardened) | 52 | RC | 52 | RC |
| Quenching medium | Oil | |||
| Hardening depth | Medium | |||
| Resistivity to distortion | High | |||
| Resistivity to cracking | High | |||
| Machinability | High | |||
| Toughness | High | |||
| Wear resistance | Low | |||
