R30816 Cobalt vs. ACI-ASTM CC50 Steel
R30816 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CC50 steel belongs to the iron alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is ACI-ASTM CC50 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Poisson's Ratio | 0.3 | |
| 0.27 |
| Shear Modulus, GPa | 81 | |
| 80 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 430 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 300 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1420 |
| Melting Onset (Solidus), °C | 1460 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 490 |
| Thermal Conductivity, W/m-K | 13 | |
| 17 |
| Thermal Expansion, µm/m-K | 12 | |
| 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.6 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 2.7 |
| Embodied Energy, MJ/kg | 320 | |
| 39 |
| Embodied Water, L/kg | 440 | |
| 170 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 22 | |
| 26 |
| Strength to Weight: Axial, points | 31 | |
| 16 |
| Strength to Weight: Bending, points | 25 | |
| 17 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 4.5 |
| Thermal Shock Resistance, points | 28 | |
| 14 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 to 0.5 |
| Chromium (Cr), % | 19 to 21 | |
| 26 to 30 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 62.9 to 74 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 4.0 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.040 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |