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Steel SAE 8620 vs Steel SAE 8640
Property comparison of Steel SAE 8620 and Steel SAE 8640, both carbon steel.
| Property | Steel SAE 8620 | Steel SAE 8640 | Difference |
|---|---|---|---|
| Yield strength | 357 MPa | 1,669 MPa | +368% |
| Tensile strength | 633 MPa | 1,862 MPa | +194% |
| Elongation | 26.3 % | 10 % | -62% |
| 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 | 183 HB | 505 HB | +176% |
| Thermal conductivity | 51.9 W/m·K | 51.9 W/m·K | 0% |
| 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 Steel SAE 8640 relative to Steel SAE 8620. 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 8620
- standard
- ANSI
- heat treatment
- normalized
Steel SAE 8640
- standard
- ANSI
- heat treatment
- tempered at 400 F
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