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| SAE 9255 | ||||
| Chemical composition: C=0.55%, Mn=0.9%, Si=2.0% | ||||
| Property | Value in metric unit | Value in US unit | ||
| Density | 7.872 *10³ | kg/m³ | 491.4 | lb/ft³ |
|---|---|---|---|---|
| Modulus of elasticity | 205 | GPa | 29000 | ksi |
| Thermal expansion (20 ºC) | 11.5*10-6 | ºCˉ¹ | 6.39*10-6 | in/(in* ºF) |
| Specific heat capacity | 477 | J/(kg*K) | 0.114 | BTU/(lb*ºF) |
| Thermal conductivity | 51.9 | W/(m*K) | 360 | BTU*in/(hr*ft²*ºF) |
| Electric resistivity | 2.34*10-7 | Ohm*m | 2.34*10-5 | Ohm*cm |
| Tensile strength (annealed) | 536 | MPa | 112000 | psi |
| Yield strength (annealed) | 357 | MPa | 71100 | psi |
| Elongation (annealed) | 22 | % | 22 | % |
| Hardness (annealed) | 96 | RB | 96 | RB |
| Tensile strength (normalized) | 633 | MPa | 135000 | psi |
| Yield strength (normalized) | 385 | MPa | 84100 | psi |
| Elongation (normalized) | 20 | % | 20 | % |
| Hardness (normalized) | 28 (104) | RC (RB) | 28 (104) | RC (RB) |