ASTM B631 Class A vs. ASTM B631 Class B
Both ASTM B631 class A and ASTM B631 class B are otherwise unclassified metals.
For each property being compared, the top bar is ASTM B631 class A and the bottom bar is ASTM B631 class B.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 210 |
| Poisson's Ratio | 0.3 | |
| 0.31 |
| Rockwell B Hardness | 63 to 98 | |
| 53 to 85 |
| Shear Modulus, GPa | 85 to 86 | |
| 78 to 79 |
Thermal Properties
| Latent Heat of Fusion, J/g | 160 | |
| 150 |
| Melting Completion (Liquidus), °C | 2680 to 2690 | |
| 2460 to 2480 |
| Specific Heat Capacity, J/kg-K | 160 | |
| 170 |
| Thermal Conductivity, W/m-K | 420 | |
| 450 |
| Thermal Expansion, µm/m-K | 11 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 40 to 47 | |
| 50 to 53 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 25 to 29 | |
| 32 to 34 |
Otherwise Unclassified Properties
| Density, g/cm3 | 15 | |
| 14 |
| Embodied Carbon, kg CO2/kg material | 43 | |
| 49 |
| Embodied Energy, MJ/kg | 670 | |
| 760 |
Common Calculations
| Stiffness to Weight: Axial, points | 8.5 | |
| 8.1 |
| Stiffness to Weight: Bending, points | 14 | |
| 14 |
| Thermal Diffusivity, mm2/s | 180 | |
| 190 |