R31538 Cobalt vs. C72700 Copper-nickel
R31538 cobalt belongs to the cobalt alloys classification, while C72700 copper-nickel belongs to the copper 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 R31538 cobalt and the bottom bar is C72700 copper-nickel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 120 |
| Elongation at Break, % | 13 to 23 | |
| 4.0 to 36 |
| Poisson's Ratio | 0.29 | |
| 0.34 |
| Shear Modulus, GPa | 86 | |
| 44 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 460 to 1070 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 580 to 1060 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 210 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1100 |
| Melting Onset (Solidus), °C | 1290 | |
| 930 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 380 |
| Thermal Conductivity, W/m-K | 13 | |
| 54 |
| Thermal Expansion, µm/m-K | 13 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 11 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.8 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 4.0 |
| Embodied Energy, MJ/kg | 110 | |
| 62 |
| Embodied Water, L/kg | 530 | |
| 350 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 20 to 380 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 1420 to 4770 |
| Stiffness to Weight: Axial, points | 15 | |
| 7.4 |
| Stiffness to Weight: Bending, points | 24 | |
| 19 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 14 to 34 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 15 to 26 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 16 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 16 to 38 |
Alloy Composition
| Carbon (C), % | 0.15 to 0.35 | |
| 0 |
| Chromium (Cr), % | 26 to 30 | |
| 0 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 0 |
| Copper (Cu), % | 0 | |
| 82.1 to 86 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.5 |
| Lead (Pb), % | 0 | |
| 0 to 0.020 |
| Magnesium (Mg), % | 0 | |
| 0 to 0.15 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.050 to 0.3 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 8.5 to 9.5 |
| Niobium (Nb), % | 0 | |
| 0 to 0.1 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 |
| Tin (Sn), % | 0 | |
| 5.5 to 6.5 |
| Zinc (Zn), % | 0 | |
| 0 to 0.5 |
| Residuals, % | 0 | |
| 0 to 0.3 |