ASTM B631 Class B vs. R31538 Cobalt
ASTM B631 class B belongs to the otherwise unclassified metals classification, while R31538 cobalt belongs to the cobalt alloys. There are 16 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.
For each property being compared, the top bar is ASTM B631 class B and the bottom bar is R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 220 |
| Poisson's Ratio | 0.31 | |
| 0.29 |
| Shear Modulus, GPa | 78 to 79 | |
| 86 |
Thermal Properties
| Latent Heat of Fusion, J/g | 150 | |
| 320 |
| Melting Completion (Liquidus), °C | 2460 to 2480 | |
| 1360 |
| Specific Heat Capacity, J/kg-K | 170 | |
| 450 |
| Thermal Conductivity, W/m-K | 450 | |
| 13 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 50 to 53 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 32 to 34 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 14 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 49 | |
| 8.1 |
| Embodied Energy, MJ/kg | 760 | |
| 110 |
Common Calculations
| Stiffness to Weight: Axial, points | 8.1 | |
| 15 |
| Stiffness to Weight: Bending, points | 14 | |
| 24 |
| Thermal Diffusivity, mm2/s | 190 | |
| 3.5 |