R31539 Cobalt vs. ACI-ASTM CC50 Steel
R31539 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CC50 steel belongs to the iron alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 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 R31539 cobalt and the bottom bar is ACI-ASTM CC50 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 200 |
| Poisson's Ratio | 0.29 | |
| 0.27 |
| Shear Modulus, GPa | 86 | |
| 80 |
| Tensile Strength: Ultimate (UTS), MPa | 1000 to 1340 | |
| 430 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 300 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1420 |
| Melting Onset (Solidus), °C | 1290 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 490 |
| Thermal Conductivity, W/m-K | 13 | |
| 17 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 2.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.6 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 2.7 |
| Embodied Energy, MJ/kg | 110 | |
| 39 |
| Embodied Water, L/kg | 530 | |
| 170 |
Common Calculations
| Stiffness to Weight: Axial, points | 15 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 26 |
| Strength to Weight: Axial, points | 33 to 44 | |
| 16 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 17 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 4.5 |
| Thermal Shock Resistance, points | 24 to 32 | |
| 14 |
Alloy Composition
| Aluminum (Al), % | 0.3 to 1.0 | |
| 0 |
| Carbon (C), % | 0 to 0.14 | |
| 0 to 0.5 |
| Chromium (Cr), % | 26 to 30 | |
| 26 to 30 |
| Cobalt (Co), % | 57.7 to 68.7 | |
| 0 |
| Iron (Fe), % | 0 to 0.75 | |
| 62.9 to 74 |
| Lanthanum (La), % | 0.030 to 0.2 | |
| 0 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 to 4.0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.040 |