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BS 817M40 vs BS 905M39
Property comparison of BS 817M40 and BS 905M39, both carbon steel.
| Property | BS 817M40 | BS 905M39 | Difference |
|---|---|---|---|
| Yield strength | 925 MPa | 570 MPa | -38% |
| Tensile strength | 1,075 MPa | 775 MPa | -28% |
| Elongation | 11 % | 15 % | +36% |
| Elastic modulus | 206,000 MPa | 206,000 MPa | 0% |
| Shear modulus | 80,000 MPa | 80,000 MPa | 0% |
| Poisson ratio | 0.3 | 0.3 | 0% |
| Density | 7,860 kg/m³ | 7,860 kg/m³ | 0% |
| Thermal conductivity | 51.9 W/m·K | 51.9 W/m·K | 0% |
| Specific heat | 462 J/kg·K | 462 J/kg·K | 0% |
| Coefficient of thermal expansion | 0.000012 1/K | 0.000012 1/K | 0% |
| Melting point | 1,480 °C | 1,480 °C | 0% |
Difference is BS 905M39 relative to BS 817M40. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
BS 817M40
- standard
- BS
- heat treatment
- heat treated
BS 905M39
- standard
- BS
- heat treatment
- nitrided
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