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BS 55E vs BS 708M40
Property comparison of BS 55E and BS 708M40, both carbon steel.
| Property | BS 55E | BS 708M40 | Difference |
|---|---|---|---|
| Yield strength | 430 MPa | 740 MPa | +72% |
| Tensile strength | 550 MPa | 925 MPa | +68% |
| Elongation | 19 % | 12 % | -37% |
| 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 | 65.4 W/m·K | 51.9 W/m·K | -21% |
| Specific heat | 457 J/kg·K | 462 J/kg·K | +1% |
| 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 708M40 relative to BS 55E. 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 55E
- standard
- BS
- heat treatment
- —
BS 708M40
- standard
- BS
- heat treatment
- face hardened
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