R30021 Cobalt vs. Commercially Pure Silver
R30021 cobalt belongs to the cobalt alloys classification, while commercially pure silver belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is R30021 cobalt and the bottom bar is commercially pure silver.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 71 |
| Elongation at Break, % | 9.0 | |
| 1.1 to 29 |
| Poisson's Ratio | 0.29 | |
| 0.37 |
| Shear Modulus, GPa | 86 | |
| 26 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 190 to 340 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 110 |
| Melting Completion (Liquidus), °C | 1350 | |
| 960 |
| Melting Onset (Solidus), °C | 1190 | |
| 960 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 240 |
| Thermal Conductivity, W/m-K | 15 | |
| 420 |
| Thermal Expansion, µm/m-K | 11 | |
| 20 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 100 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 87 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 10 |
Common Calculations
| Stiffness to Weight: Axial, points | 15 | |
| 3.8 |
| Stiffness to Weight: Bending, points | 24 | |
| 13 |
| Strength to Weight: Axial, points | 23 | |
| 4.9 to 8.9 |
| Strength to Weight: Bending, points | 21 | |
| 6.9 to 10 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 170 |
| Thermal Shock Resistance, points | 21 | |
| 9.5 to 17 |
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 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 0 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 0 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 |
| Silver (Ag), % | 0 | |
| 99.9 to 100 |
| Residuals, % | 0 | |
| 0 to 0.1 |