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