R30021 Cobalt vs. C75700 Nickel Silver
R30021 cobalt belongs to the cobalt alloys classification, while C75700 nickel silver 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 R30021 cobalt and the bottom bar is C75700 nickel silver.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 120 |
| Elongation at Break, % | 9.0 | |
| 3.2 to 22 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Shear Modulus, GPa | 86 | |
| 45 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 590 to 610 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 470 to 580 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 200 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1040 |
| Melting Onset (Solidus), °C | 1190 | |
| 990 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 390 |
| Thermal Conductivity, W/m-K | 15 | |
| 40 |
| Thermal Expansion, µm/m-K | 11 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 8.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 8.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 3.6 |
| Embodied Energy, MJ/kg | 110 | |
| 56 |
| Embodied Water, L/kg | 520 | |
| 310 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 19 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 930 to 1410 |
| Stiffness to Weight: Axial, points | 15 | |
| 7.8 |
| Stiffness to Weight: Bending, points | 24 | |
| 19 |
| Strength to Weight: Axial, points | 23 | |
| 19 to 20 |
| Strength to Weight: Bending, points | 21 | |
| 19 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 12 |
| Thermal Shock Resistance, points | 21 | |
| 22 to 23 |
Alloy Composition
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| Carbon (C), % | 0.2 to 0.35 | |
| 0 |
| Chromium (Cr), % | 26 to 29 | |
| 0 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Copper (Cu), % | 0 | |
| 63.5 to 66.5 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 to 0.25 |
| Lead (Pb), % | 0 | |
| 0 to 0.050 |
| Manganese (Mn), % | 0 | |
| 0 to 0.5 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 0 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 11 to 13 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 19.2 to 25.5 |
| Residuals, % | 0 | |
| 0 to 0.5 |