ASTM B631 Class A vs. SAE-AISI 8740 Steel
ASTM B631 class A belongs to the otherwise unclassified metals classification, while SAE-AISI 8740 steel belongs to the iron alloys. There are 16 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.
For each property being compared, the top bar is ASTM B631 class A and the bottom bar is SAE-AISI 8740 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Poisson's Ratio | 0.3 | |
| 0.29 |
| Shear Modulus, GPa | 85 to 86 | |
| 73 |
Thermal Properties
| Latent Heat of Fusion, J/g | 160 | |
| 250 |
| Melting Completion (Liquidus), °C | 2680 to 2690 | |
| 1460 |
| Specific Heat Capacity, J/kg-K | 160 | |
| 470 |
| Thermal Conductivity, W/m-K | 420 | |
| 39 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 40 to 47 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 25 to 29 | |
| 8.4 |
Otherwise Unclassified Properties
| Density, g/cm3 | 15 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 43 | |
| 1.5 |
| Embodied Energy, MJ/kg | 670 | |
| 20 |
Common Calculations
| Stiffness to Weight: Axial, points | 8.5 | |
| 13 |
| Stiffness to Weight: Bending, points | 14 | |
| 24 |
| Thermal Diffusivity, mm2/s | 180 | |
| 10 |