R30155 Cobalt vs. C71520 Copper-nickel
R30155 cobalt belongs to the iron alloys classification, while C71520 copper-nickel belongs to the copper alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is C71520 copper-nickel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 140 |
| Elongation at Break, % | 34 | |
| 10 to 45 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 81 | |
| 51 |
| Shear Strength, MPa | 570 | |
| 250 to 340 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 370 to 570 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 140 to 430 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 230 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 260 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1170 |
| Melting Onset (Solidus), °C | 1420 | |
| 1120 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 400 |
| Thermal Conductivity, W/m-K | 12 | |
| 32 |
| Thermal Expansion, µm/m-K | 14 | |
| 15 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 40 |
| Density, g/cm3 | 8.5 | |
| 8.9 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 5.0 |
| Embodied Energy, MJ/kg | 150 | |
| 73 |
| Embodied Water, L/kg | 300 | |
| 280 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 54 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 67 to 680 |
| Stiffness to Weight: Axial, points | 14 | |
| 8.6 |
| Stiffness to Weight: Bending, points | 23 | |
| 19 |
| Strength to Weight: Axial, points | 28 | |
| 12 to 18 |
| Strength to Weight: Bending, points | 24 | |
| 13 to 17 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 8.9 |
| Thermal Shock Resistance, points | 21 | |
| 12 to 19 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0 to 0.050 |
| Chromium (Cr), % | 20 to 22.5 | |
| 0 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Copper (Cu), % | 0 | |
| 65 to 71.6 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 0.4 to 1.0 |
| Lead (Pb), % | 0 | |
| 0 to 0.020 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 28 to 33 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.2 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.020 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.5 |
| Residuals, % | 0 | |
| 0 to 0.5 |