SAE 8620 Carbon Steel (Normalized at 915 °C (1675 T)) vs SAE 8630 Carbon Steel (Water quenched from 845 °C (1550 T) and tempered at 540 °C ()
Property comparison of SAE 8620 Carbon Steel (Normalized at 915 °C (1675 T)) and SAE 8630 Carbon Steel (Water quenched from 845 °C (1550 T) and tempered at 540 °C (), both carbon steel.
| Property | SAE 8620 Carbon Steel (Normalized at 915 °C (1675 T)) | SAE 8630 Carbon Steel (Water quenched from 845 °C (1550 T) and tempered at 540 °C () | Difference |
|---|---|---|---|
| Yield strength | 360 MPa | 850 MPa | +136% |
| Tensile strength | 635 MPa | 931 MPa | +47% |
| Elongation | 26.3 % | 18.7 % | -29% |
| Elastic modulus | 200,000 MPa | 200,000 MPa | 0% |
| Shear modulus | 76,923 MPa | 76,923 MPa | 0% |
| Poisson ratio | 0.3 | 0.3 | 0% |
| Density | 7,850 kg/m³ | 7,850 kg/m³ | 0% |
| Brinell hardness | 183 HB | 269 HB | +47% |
| Thermal conductivity | 51.9 W/m·K | 51.9 W/m·K | 0% |
| Specific heat | 457 J/kg·K | 460 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% |
| Reduction in area | 59.7 % | 59.6 % | 0% |
Difference is SAE 8630 Carbon Steel (Water quenched from 845 °C (1550 T) and tempered at 540 °C () relative to SAE 8620 Carbon Steel (Normalized at 915 °C (1675 T)). 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
- 8620
- standard
- SAE
- heat treatment
- Normalized at 915 °C (1675 T)
- grade
- 8630
- standard
- SAE
- heat treatment
- Water quenched from 845 °C (1550 T) and tempered at 540 °C (1000 T)
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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