R30008 Cobalt vs. C71640 Copper-nickel
R30008 cobalt belongs to the cobalt alloys classification, while C71640 copper-nickel belongs to the copper 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 R30008 cobalt and the bottom bar is C71640 copper-nickel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 140 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 83 | |
| 52 |
| Tensile Strength: Ultimate (UTS), MPa | 950 to 1700 | |
| 490 to 630 |
| Tensile Strength: Yield (Proof), MPa | 500 to 1080 | |
| 190 to 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 240 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1180 |
| Melting Onset (Solidus), °C | 1330 | |
| 1120 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 410 |
| Thermal Expansion, µm/m-K | 13 | |
| 15 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 95 | |
| 40 |
| Density, g/cm3 | 8.4 | |
| 8.9 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 5.0 |
| Embodied Energy, MJ/kg | 110 | |
| 73 |
| Embodied Water, L/kg | 400 | |
| 280 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 2720 | |
| 130 to 750 |
| Stiffness to Weight: Axial, points | 14 | |
| 8.7 |
| Stiffness to Weight: Bending, points | 24 | |
| 20 |
| Strength to Weight: Axial, points | 31 to 56 | |
| 15 to 20 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 16 to 18 |
| Thermal Shock Resistance, points | 25 to 44 | |
| 16 to 21 |
Alloy Composition
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| Boron (B), % | 0 to 0.0010 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 0 |
| Chromium (Cr), % | 18.5 to 21.5 | |
| 0 |
| Cobalt (Co), % | 39 to 42 | |
| 0 |
| Copper (Cu), % | 0 | |
| 61.7 to 67.8 |
| Iron (Fe), % | 7.6 to 20 | |
| 1.7 to 2.3 |
| Lead (Pb), % | 0 | |
| 0 to 0.050 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 1.5 to 2.5 |
| Molybdenum (Mo), % | 6.5 to 7.5 | |
| 0 |
| Nickel (Ni), % | 15 to 18 | |
| 29 to 32 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 1.0 |
| Residuals, % | 0 | |
| 0 to 0.5 |