C71640 Copper-nickel vs. R30008 Cobalt
C71640 copper-nickel belongs to the copper alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have a modest 20% 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 (7, in this case) are not shown.
For each property being compared, the top bar is C71640 copper-nickel and the bottom bar is R30008 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 210 |
| Poisson's Ratio | 0.33 | |
| 0.29 |
| Shear Modulus, GPa | 52 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 490 to 630 | |
| 950 to 1700 |
| Tensile Strength: Yield (Proof), MPa | 190 to 460 | |
| 500 to 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 240 | |
| 320 |
| Melting Completion (Liquidus), °C | 1180 | |
| 1400 |
| Melting Onset (Solidus), °C | 1120 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 410 | |
| 450 |
| Thermal Expansion, µm/m-K | 15 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 40 | |
| 95 |
| Density, g/cm3 | 8.9 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 5.0 | |
| 8.1 |
| Embodied Energy, MJ/kg | 73 | |
| 110 |
| Embodied Water, L/kg | 280 | |
| 400 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 130 to 750 | |
| 590 to 2720 |
| Stiffness to Weight: Axial, points | 8.7 | |
| 14 |
| Stiffness to Weight: Bending, points | 20 | |
| 24 |
| Strength to Weight: Axial, points | 15 to 20 | |
| 31 to 56 |
| Strength to Weight: Bending, points | 16 to 18 | |
| 25 to 37 |
| Thermal Shock Resistance, points | 16 to 21 | |
| 25 to 44 |
Alloy Composition
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| Boron (B), % | 0 | |
| 0 to 0.0010 |
| Carbon (C), % | 0 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0 | |
| 18.5 to 21.5 |
| Cobalt (Co), % | 0 | |
| 39 to 42 |
| Copper (Cu), % | 61.7 to 67.8 | |
| 0 |
| Iron (Fe), % | 1.7 to 2.3 | |
| 7.6 to 20 |
| Lead (Pb), % | 0 to 0.050 | |
| 0 |
| Manganese (Mn), % | 1.5 to 2.5 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 6.5 to 7.5 |
| Nickel (Ni), % | 29 to 32 | |
| 15 to 18 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 | |
| 0 to 1.2 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Zinc (Zn), % | 0 to 1.0 | |
| 0 |
| Residuals, % | 0 to 0.5 | |
| 0 |