ASTM B631 Class A vs. R30816 Cobalt
ASTM B631 class A belongs to the otherwise unclassified metals classification, while R30816 cobalt belongs to the cobalt alloys. There are 14 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 R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 210 |
| Poisson's Ratio | 0.3 | |
| 0.3 |
| Shear Modulus, GPa | 85 to 86 | |
| 81 |
Thermal Properties
| Latent Heat of Fusion, J/g | 160 | |
| 300 |
| Melting Completion (Liquidus), °C | 2680 to 2690 | |
| 1540 |
| Specific Heat Capacity, J/kg-K | 160 | |
| 420 |
| Thermal Conductivity, W/m-K | 420 | |
| 13 |
| Thermal Expansion, µm/m-K | 11 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 15 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 43 | |
| 20 |
| Embodied Energy, MJ/kg | 670 | |
| 320 |
Common Calculations
| Stiffness to Weight: Axial, points | 8.5 | |
| 13 |
| Stiffness to Weight: Bending, points | 14 | |
| 22 |
| Thermal Diffusivity, mm2/s | 180 | |
| 3.3 |