Annealed R31538 Cobalt vs. Annealed R30008 Cobalt
Both annealed R31538 cobalt and annealed R30008 cobalt are cobalt alloys. Both are furnished in the annealed condition. 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 annealed R31538 cobalt and the bottom bar is annealed R30008 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 210 |
| Elongation at Break, % | 23 | |
| 73 |
| Fatigue Strength, MPa | 310 | |
| 320 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 86 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 950 |
| Tensile Strength: Yield (Proof), MPa | 580 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 320 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1400 |
| Melting Onset (Solidus), °C | 1290 | |
| 1330 |
| 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 | 530 | |
| 400 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 | |
| 590 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 34 | |
| 31 |
| Strength to Weight: Bending, points | 27 | |
| 25 |
| Thermal Shock Resistance, points | 25 | |
| 25 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.0010 |
| Carbon (C), % | 0.15 to 0.35 | |
| 0 to 0.15 |
| Chromium (Cr), % | 26 to 30 | |
| 18.5 to 21.5 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 39 to 42 |
| Iron (Fe), % | 0 to 0.75 | |
| 7.6 to 20 |
| Manganese (Mn), % | 0 to 1.0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 6.5 to 7.5 |
| Nickel (Ni), % | 0 to 1.0 | |
| 15 to 18 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.2 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |