R30155 Cobalt vs. ASTM B617 Coin Silver
R30155 cobalt belongs to the iron alloys classification, while ASTM B617 coin silver belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is ASTM B617 coin silver.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 75 |
| Elongation at Break, % | 34 | |
| 1.1 to 22 |
| Poisson's Ratio | 0.29 | |
| 0.37 |
| Shear Modulus, GPa | 81 | |
| 28 |
| Shear Strength, MPa | 570 | |
| 180 to 290 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 290 to 520 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 120 |
| Melting Completion (Liquidus), °C | 1470 | |
| 870 |
| Melting Onset (Solidus), °C | 1420 | |
| 780 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 250 |
| Thermal Expansion, µm/m-K | 14 | |
| 19 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.5 | |
| 10 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 4.1 |
| Stiffness to Weight: Bending, points | 23 | |
| 14 |
| Strength to Weight: Axial, points | 28 | |
| 7.7 to 14 |
| Strength to Weight: Bending, points | 24 | |
| 9.3 to 14 |
| Thermal Shock Resistance, points | 21 | |
| 14 to 25 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.0050 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.050 |
| Carbon (C), % | 0.080 to 0.16 | |
| 0 |
| Chromium (Cr), % | 20 to 22.5 | |
| 0 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Copper (Cu), % | 0 | |
| 9.0 to 10.4 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 0 to 0.050 |
| Lead (Pb), % | 0 | |
| 0 to 0.030 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 0.010 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 |
| Silver (Ag), % | 0 | |
| 89.6 to 91 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.060 |
| Residuals, % | 0 | |
| 0 to 0.060 |