AISI 8630 Low-Alloy Steel Bars and Forgings vs SAE 8620 Carbon Steel (Annealed at 870 °C (1600 °F))
Property comparison of AISI 8630 Low-Alloy Steel Bars and Forgings and SAE 8620 Carbon Steel (Annealed at 870 °C (1600 °F)), both carbon steel.
| Property | AISI 8630 Low-Alloy Steel Bars and Forgings | SAE 8620 Carbon Steel (Annealed at 870 °C (1600 °F)) | Difference |
|---|---|---|---|
| Tensile strength | 861.8 MPa | 540 MPa | -37% |
| Elastic modulus | 199,948 MPa | 200,000 MPa | 0% |
| Shear modulus | 75,842 MPa | 76,923 MPa | +1% |
| Poisson ratio | 0.32 | 0.3 | -6% |
| Density | 7,833 kg/m³ | 7,850 kg/m³ | 0% |
| Specific heat | 460 J/kg·K | 457 J/kg·K | -1% |
Difference is SAE 8620 Carbon Steel (Annealed at 870 °C (1600 °F)) relative to AISI 8630 Low-Alloy Steel Bars and Forgings. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- grade
- AISI 8630
- standard
- MIL-HDBK-5J
- heat treatment
- Quenched and tempered
- grade
- 8620
- standard
- SAE
- heat treatment
- Annealed at 870 °C (1600 °F)
About AISI/SAE 86xx nickel-chromium-molybdenum steels
86xx grades are nickel-chromium-molybdenum case-hardening steels, leaner in nickel than 43xx. 8620 is the standard carburizing grade for gears and shafts; 8740 is used heat-treated through and through for higher-strength fasteners.
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