R30008 Cobalt vs. R30021 Cobalt
Both R30008 cobalt and R30021 cobalt are cobalt alloys. They have 70% 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 R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 220 |
| Elongation at Break, % | 1.1 to 73 | |
| 9.0 |
| Fatigue Strength, MPa | 320 to 530 | |
| 250 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 83 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 950 to 1700 | |
| 700 |
| Tensile Strength: Yield (Proof), MPa | 500 to 1080 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 330 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1350 |
| Melting Onset (Solidus), °C | 1330 | |
| 1190 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 450 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 8.0 |
| Embodied Energy, MJ/kg | 110 | |
| 110 |
| Embodied Water, L/kg | 400 | |
| 520 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 2720 | |
| 570 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 31 to 56 | |
| 23 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 21 |
| Thermal Shock Resistance, points | 25 to 44 | |
| 21 |
Alloy Composition
| Boron (B), % | 0 to 0.0010 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 0.2 to 0.35 |
| Chromium (Cr), % | 18.5 to 21.5 | |
| 26 to 29 |
| Cobalt (Co), % | 39 to 42 | |
| 61.7 to 67.3 |
| Iron (Fe), % | 7.6 to 20 | |
| 0 to 3.0 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 6.5 to 7.5 | |
| 4.5 to 6.0 |
| Nickel (Ni), % | 15 to 18 | |
| 2.0 to 3.0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |