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Steel SAE 4340 vs Steel SAE 4820
Property comparison of Steel SAE 4340 and Steel SAE 4820, both carbon steel.
| Property | Steel SAE 4340 | Steel SAE 4820 | Difference |
|---|---|---|---|
| Yield strength | 1,675 MPa | 464 MPa | -72% |
| Tensile strength | 1,875 MPa | 681 MPa | -64% |
| Elongation | 10 % | 22.3 % | +123% |
| 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 | 520 HB | 197 HB | -62% |
| Thermal conductivity | 51.9 W/m·K | 51.9 W/m·K | 0% |
| Specific heat | 462 J/kg·K | 457 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 4820 relative to Steel SAE 4340. 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 4340
- standard
- ANSI
- heat treatment
- tempered at 400 F
Steel SAE 4820
- standard
- ANSI
- heat treatment
- annealed
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