R30016 Cobalt vs. R30021 Cobalt
Both R30016 cobalt and R30021 cobalt are cobalt alloys. Both are furnished in the annealed condition. They have a moderately high 91% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is R30016 cobalt and the bottom bar is R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 1600 | |
| 1300 |
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 220 |
| Elongation at Break, % | 8.4 | |
| 9.0 |
| Fatigue Strength, MPa | 290 | |
| 250 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Rockwell C Hardness | 37 | |
| 32 |
| Shear Modulus, GPa | 85 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 1010 | |
| 700 |
| Tensile Strength: Yield (Proof), MPa | 580 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 330 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1350 |
| Melting Onset (Solidus), °C | 1270 | |
| 1190 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 450 |
| Thermal Conductivity, W/m-K | 15 | |
| 15 |
| Thermal Expansion, µm/m-K | 14 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 1.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.0 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.5 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 7.7 | |
| 8.0 |
| Embodied Energy, MJ/kg | 110 | |
| 110 |
| Embodied Water, L/kg | 500 | |
| 520 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 72 | |
| 57 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 770 | |
| 570 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 33 | |
| 23 |
| Strength to Weight: Bending, points | 26 | |
| 21 |
| Thermal Diffusivity, mm2/s | 3.9 | |
| 3.8 |
| Thermal Shock Resistance, points | 24 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0.9 to 1.4 | |
| 0.2 to 0.35 |
| Chromium (Cr), % | 28 to 32 | |
| 26 to 29 |
| Cobalt (Co), % | 49.6 to 66.9 | |
| 61.7 to 67.3 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0.5 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 0 to 1.5 | |
| 4.5 to 6.0 |
| Nickel (Ni), % | 0 to 3.0 | |
| 2.0 to 3.0 |
| Silicon (Si), % | 0.2 to 2.0 | |
| 0 to 1.5 |
| Tungsten (W), % | 3.5 to 5.5 | |
| 0 |