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BS 708M40 vs BS 817M40
Property comparison of BS 708M40 and BS 817M40, both carbon steel.
| Property | BS 708M40 | BS 817M40 | Difference |
|---|---|---|---|
| Yield strength | 665 MPa | 925 MPa | +39% |
| Tensile strength | 850 MPa | 1,075 MPa | +26% |
| Elongation | 13 % | 11 % | -15% |
| 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 817M40 relative to BS 708M40. 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 708M40
- standard
- BS
- heat treatment
- heat treated
BS 817M40
- standard
- BS
- heat treatment
- heat treated
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