C71640 Copper-nickel vs. R30035 Cobalt
C71640 copper-nickel belongs to the copper alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is C71640 copper-nickel and the bottom bar is R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 220 to 230 |
| Poisson's Ratio | 0.33 | |
| 0.29 |
| Shear Modulus, GPa | 52 | |
| 84 to 89 |
| Tensile Strength: Ultimate (UTS), MPa | 490 to 630 | |
| 900 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 190 to 460 | |
| 300 to 1650 |
Thermal Properties
| Latent Heat of Fusion, J/g | 240 | |
| 320 |
| Melting Completion (Liquidus), °C | 1180 | |
| 1440 |
| Melting Onset (Solidus), °C | 1120 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 410 | |
| 440 |
| Thermal Conductivity, W/m-K | 29 | |
| 11 |
| Thermal Expansion, µm/m-K | 15 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.0 | |
| 1.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 7.1 | |
| 1.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 40 | |
| 100 |
| Density, g/cm3 | 8.9 | |
| 8.7 |
| Embodied Carbon, kg CO2/kg material | 5.0 | |
| 10 |
| Embodied Energy, MJ/kg | 73 | |
| 140 |
| Embodied Water, L/kg | 280 | |
| 410 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 130 to 750 | |
| 210 to 5920 |
| Stiffness to Weight: Axial, points | 8.7 | |
| 14 to 15 |
| Stiffness to Weight: Bending, points | 20 | |
| 23 to 24 |
| Strength to Weight: Axial, points | 15 to 20 | |
| 29 to 61 |
| Strength to Weight: Bending, points | 16 to 18 | |
| 24 to 39 |
| Thermal Diffusivity, mm2/s | 8.2 | |
| 3.0 |
| Thermal Shock Resistance, points | 16 to 21 | |
| 23 to 46 |
Alloy Composition
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| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0 | |
| 0 to 0.025 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 29.1 to 39 |
| Copper (Cu), % | 61.7 to 67.8 | |
| 0 |
| Iron (Fe), % | 1.7 to 2.3 | |
| 0 to 1.0 |
| Lead (Pb), % | 0 to 0.050 | |
| 0 |
| Manganese (Mn), % | 1.5 to 2.5 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 0 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 29 to 32 | |
| 33 to 37 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 | |
| 0 to 0.15 |
| Sulfur (S), % | 0 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 1.0 |
| Zinc (Zn), % | 0 to 1.0 | |
| 0 |
| Residuals, % | 0 to 0.5 | |
| 0 |