Grade 365 Molybdenum vs. R31539 Cobalt
Grade 365 molybdenum belongs to the otherwise unclassified metals classification, while R31539 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is grade 365 molybdenum and the bottom bar is R31539 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 310 | |
| 220 |
| Elongation at Break, % | 6.3 | |
| 13 to 22 |
| Poisson's Ratio | 0.31 | |
| 0.29 |
| Shear Modulus, GPa | 120 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 620 | |
| 1000 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 530 | |
| 590 to 940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 370 | |
| 320 |
| Specific Heat Capacity, J/kg-K | 250 | |
| 450 |
| Thermal Expansion, µm/m-K | 7.0 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 10 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 28 | |
| 8.2 |
| Embodied Energy, MJ/kg | 330 | |
| 110 |
| Embodied Water, L/kg | 360 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 37 | |
| 140 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 450 | |
| 780 to 2000 |
| Stiffness to Weight: Axial, points | 17 | |
| 15 |
| Stiffness to Weight: Bending, points | 22 | |
| 24 |
| Strength to Weight: Axial, points | 17 | |
| 33 to 44 |
| Strength to Weight: Bending, points | 16 | |
| 27 to 32 |
| Thermal Shock Resistance, points | 21 | |
| 24 to 32 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0.3 to 1.0 |
| Carbon (C), % | 0 to 0.010 | |
| 0 to 0.14 |
| Chromium (Cr), % | 0 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 57.7 to 68.7 |
| Iron (Fe), % | 0 to 0.010 | |
| 0 to 0.75 |
| Lanthanum (La), % | 0 | |
| 0.030 to 0.2 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 99.9 to 100 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 to 0.0020 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 to 0.0020 | |
| 0 to 0.25 |
| Oxygen (O), % | 0 to 0.0015 | |
| 0 |
| Silicon (Si), % | 0 to 0.010 | |
| 0 to 1.0 |