R30008 Cobalt vs. R31537 Cobalt
Both R30008 cobalt and R31537 cobalt are cobalt alloys. They have 68% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is R30008 cobalt and the bottom bar is R31537 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 220 |
| Elongation at Break, % | 1.1 to 73 | |
| 14 to 23 |
| Fatigue Strength, MPa | 320 to 530 | |
| 310 to 480 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 83 | |
| 87 |
| Tensile Strength: Ultimate (UTS), MPa | 950 to 1700 | |
| 1000 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 500 to 1080 | |
| 590 to 940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 320 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1360 |
| Melting Onset (Solidus), °C | 1330 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 450 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 8.1 |
| Embodied Energy, MJ/kg | 110 | |
| 110 |
| Embodied Water, L/kg | 400 | |
| 530 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 2720 | |
| 780 to 1990 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 31 to 56 | |
| 33 to 44 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 26 to 32 |
| Thermal Shock Resistance, points | 25 to 44 | |
| 24 to 32 |
Alloy Composition
| Boron (B), % | 0 to 0.0010 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 0 to 0.14 |
| Chromium (Cr), % | 18.5 to 21.5 | |
| 26 to 30 |
| Cobalt (Co), % | 39 to 42 | |
| 58.9 to 69 |
| Iron (Fe), % | 7.6 to 20 | |
| 0 to 0.75 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 6.5 to 7.5 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 15 to 18 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |