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Steel SAE 4320 vs Steel SAE 4340
Property comparison of Steel SAE 4320 and Steel SAE 4340, both carbon steel.
| Property | Steel SAE 4320 | Steel SAE 4340 | Difference |
|---|---|---|---|
| Yield strength | 464 MPa | 862 MPa | +86% |
| Tensile strength | 793 MPa | 1,279 MPa | +61% |
| Elongation | 20.8 % | 12.2 % | -41% |
| 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 | 235 HB | 363 HB | +54% |
| 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 4340 relative to Steel SAE 4320. 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 4320
- standard
- ANSI
- heat treatment
- normalized
Steel SAE 4340
- standard
- ANSI
- heat treatment
- normalized
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