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Steel SAE 8660 vs Steel SAE 8740
Property comparison of Steel SAE 8660 and Steel SAE 8740, both carbon steel.
| Property | Steel SAE 8660 | Steel SAE 8740 | Difference |
|---|---|---|---|
| Yield strength | 1,551 MPa | 415 MPa | -73% |
| Tensile strength | 1,634 MPa | 695 MPa | -57% |
| Elongation | 13 % | 22.2 % | +71% |
| Elastic modulus | 207,000 MPa | 207,000 MPa | 0% |
| Shear modulus | 79,000 MPa | 79,000 MPa | 0% |
| Poisson ratio | 0.3 | 0.3 | 0% |
| Density | 7,860 kg/m³ | 7,860 kg/m³ | 0% |
| Brinell hardness | 460 HB | 201 HB | -56% |
| Thermal conductivity | 51.9 W/m·K | 51.9 W/m·K | 0% |
| Specific heat | 467 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 Steel SAE 8740 relative to Steel SAE 8660. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
Steel SAE 8660
- standard
- ANSI
- heat treatment
- tempered at 800 F
Steel SAE 8740
- standard
- ANSI
- heat treatment
- annealed
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