C72900 Copper-nickel vs. R31537 Cobalt
C72900 copper-nickel belongs to the copper alloys classification, while R31537 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is C72900 copper-nickel and the bottom bar is R31537 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 120 | |
| 220 |
| Elongation at Break, % | 6.0 to 20 | |
| 14 to 23 |
| Poisson's Ratio | 0.34 | |
| 0.29 |
| Shear Modulus, GPa | 45 | |
| 87 |
| Tensile Strength: Ultimate (UTS), MPa | 870 to 1080 | |
| 1000 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 700 to 920 | |
| 590 to 940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 210 | |
| 320 |
| Melting Completion (Liquidus), °C | 1120 | |
| 1360 |
| Melting Onset (Solidus), °C | 950 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 380 | |
| 450 |
| Thermal Conductivity, W/m-K | 29 | |
| 13 |
| Thermal Expansion, µm/m-K | 17 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.8 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.0 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.8 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 4.6 | |
| 8.1 |
| Embodied Energy, MJ/kg | 72 | |
| 110 |
| Embodied Water, L/kg | 360 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 49 to 210 | |
| 140 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2030 to 3490 | |
| 780 to 1990 |
| Stiffness to Weight: Axial, points | 7.6 | |
| 15 |
| Stiffness to Weight: Bending, points | 19 | |
| 24 |
| Strength to Weight: Axial, points | 27 to 34 | |
| 33 to 44 |
| Strength to Weight: Bending, points | 23 to 27 | |
| 26 to 32 |
| Thermal Diffusivity, mm2/s | 8.6 | |
| 3.4 |
| Thermal Shock Resistance, points | 31 to 38 | |
| 24 to 32 |
Alloy Composition
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| Carbon (C), % | 0 | |
| 0 to 0.14 |
| Chromium (Cr), % | 0 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.9 to 69 |
| Copper (Cu), % | 74.1 to 78 | |
| 0 |
| Iron (Fe), % | 0 to 0.5 | |
| 0 to 0.75 |
| Lead (Pb), % | 0 to 0.020 | |
| 0 |
| Magnesium (Mg), % | 0 to 0.15 | |
| 0 |
| Manganese (Mn), % | 0 to 0.3 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 14.5 to 15.5 | |
| 0 to 1.0 |
| Niobium (Nb), % | 0 to 0.1 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Tin (Sn), % | 7.5 to 8.5 | |
| 0 |
| Zinc (Zn), % | 0 to 0.5 | |
| 0 |
| Residuals, % | 0 to 0.3 | |
| 0 |