R30816 Cobalt vs. C71640 Copper-nickel
R30816 cobalt belongs to the cobalt alloys classification, while C71640 copper-nickel belongs to the copper alloys. They have a modest 24% 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 (9, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is C71640 copper-nickel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 140 |
| Poisson's Ratio | 0.3 | |
| 0.33 |
| Shear Modulus, GPa | 81 | |
| 52 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 490 to 630 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 190 to 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 240 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1180 |
| Melting Onset (Solidus), °C | 1460 | |
| 1120 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 410 |
| Thermal Conductivity, W/m-K | 13 | |
| 29 |
| Thermal Expansion, µm/m-K | 12 | |
| 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 8.9 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 5.0 |
| Embodied Energy, MJ/kg | 320 | |
| 73 |
| Embodied Water, L/kg | 440 | |
| 280 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 130 to 750 |
| Stiffness to Weight: Axial, points | 13 | |
| 8.7 |
| Stiffness to Weight: Bending, points | 22 | |
| 20 |
| Strength to Weight: Axial, points | 31 | |
| 15 to 20 |
| Strength to Weight: Bending, points | 25 | |
| 16 to 18 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 8.2 |
| Thermal Shock Resistance, points | 28 | |
| 16 to 21 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 |
| Chromium (Cr), % | 19 to 21 | |
| 0 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Copper (Cu), % | 0 | |
| 61.7 to 67.8 |
| Iron (Fe), % | 0 to 5.0 | |
| 1.7 to 2.3 |
| Lead (Pb), % | 0 | |
| 0 to 0.050 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 1.5 to 2.5 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 29 to 32 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 1.0 |
| Residuals, % | 0 | |
| 0 to 0.5 |