R30816 Cobalt vs. 70Ag-30Ni Alloy
R30816 cobalt belongs to the cobalt alloys classification, while 70Ag-30Ni alloy belongs to the otherwise unclassified metals. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 15 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is 70Ag-30Ni alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 100 |
| Poisson's Ratio | 0.3 | |
| 0.35 |
| Shear Modulus, GPa | 81 | |
| 39 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 320 to 530 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 170 |
| Melting Completion (Liquidus), °C | 1540 | |
| 960 |
| Melting Onset (Solidus), °C | 1460 | |
| 960 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 300 |
| Thermal Expansion, µm/m-K | 12 | |
| 17 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 10 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 5.8 |
| Stiffness to Weight: Bending, points | 22 | |
| 16 |
| Strength to Weight: Axial, points | 31 | |
| 8.8 to 15 |
| Strength to Weight: Bending, points | 25 | |
| 10 to 15 |
| Thermal Shock Resistance, points | 28 | |
| 13 to 21 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 |
| Chromium (Cr), % | 19 to 21 | |
| 0 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 0 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 28.8 to 31 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 |
| Silver (Ag), % | 0 | |
| 69 to 71 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.2 |