C72800 Copper-nickel vs. R31539 Cobalt
C72800 copper-nickel belongs to the copper alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 27 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 C72800 copper-nickel and the bottom bar is R31539 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 120 | |
| 220 |
| Elongation at Break, % | 3.9 to 23 | |
| 13 to 22 |
| Poisson's Ratio | 0.34 | |
| 0.29 |
| Rockwell C Hardness | 21 to 40 | |
| 25 to 35 |
| Shear Modulus, GPa | 44 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 520 to 1270 | |
| 1000 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 250 to 1210 | |
| 590 to 940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 210 | |
| 320 |
| Melting Completion (Liquidus), °C | 1080 | |
| 1360 |
| Melting Onset (Solidus), °C | 920 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 380 | |
| 450 |
| Thermal Conductivity, W/m-K | 55 | |
| 13 |
| Thermal Expansion, µm/m-K | 17 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 11 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 11 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.8 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 4.4 | |
| 8.2 |
| Embodied Energy, MJ/kg | 68 | |
| 110 |
| Embodied Water, L/kg | 360 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 37 to 99 | |
| 140 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 260 to 5650 | |
| 780 to 2000 |
| Stiffness to Weight: Axial, points | 7.4 | |
| 15 |
| Stiffness to Weight: Bending, points | 19 | |
| 24 |
| Strength to Weight: Axial, points | 17 to 40 | |
| 33 to 44 |
| Strength to Weight: Bending, points | 16 to 30 | |
| 27 to 32 |
| Thermal Diffusivity, mm2/s | 17 | |
| 3.5 |
| Thermal Shock Resistance, points | 19 to 45 | |
| 24 to 32 |
Alloy Composition
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| Aluminum (Al), % | 0 to 0.1 | |
| 0.3 to 1.0 |
| Antimony (Sb), % | 0 to 0.020 | |
| 0 |
| Bismuth (Bi), % | 0 to 0.0010 | |
| 0 |
| Boron (B), % | 0 to 0.0010 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.14 |
| Chromium (Cr), % | 0 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 57.7 to 68.7 |
| Copper (Cu), % | 78.3 to 82.8 | |
| 0 |
| Iron (Fe), % | 0 to 0.5 | |
| 0 to 0.75 |
| Lanthanum (La), % | 0 | |
| 0.030 to 0.2 |
| Lead (Pb), % | 0 to 0.0050 | |
| 0 |
| Magnesium (Mg), % | 0.0050 to 0.15 | |
| 0 |
| Manganese (Mn), % | 0.050 to 0.3 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 9.5 to 10.5 | |
| 0 to 1.0 |
| Niobium (Nb), % | 0.1 to 0.3 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.0050 | |
| 0 |
| Silicon (Si), % | 0 to 0.050 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.0025 | |
| 0 |
| Tin (Sn), % | 7.5 to 8.5 | |
| 0 |
| Titanium (Ti), % | 0 to 0.010 | |
| 0 |
| Zinc (Zn), % | 0 to 1.0 | |
| 0 |
| Residuals, % | 0 to 0.3 | |
| 0 |