R30021 Cobalt vs. AWS BVAu-4
R30021 cobalt belongs to the cobalt alloys classification, while AWS BVAu-4 belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is R30021 cobalt and the bottom bar is AWS BVAu-4.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 110 |
| Poisson's Ratio | 0.29 | |
| 0.4 |
| Shear Modulus, GPa | 86 | |
| 41 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 190 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 100 |
| Melting Completion (Liquidus), °C | 1350 | |
| 950 |
| Melting Onset (Solidus), °C | 1190 | |
| 950 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 190 |
| Thermal Expansion, µm/m-K | 11 | |
| 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 17 |
Common Calculations
| Stiffness to Weight: Axial, points | 15 | |
| 3.6 |
| Stiffness to Weight: Bending, points | 24 | |
| 9.3 |
| Strength to Weight: Axial, points | 23 | |
| 3.0 |
| Strength to Weight: Bending, points | 21 | |
| 4.2 |
| Thermal Shock Resistance, points | 21 | |
| 8.7 |
Alloy Composition
| Cadmium (Cd), % | 0 | |
| 0 to 0.0010 |
| Carbon (C), % | 0.2 to 0.35 | |
| 0 to 0.0050 |
| Chromium (Cr), % | 26 to 29 | |
| 0 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Gold (Au), % | 0 | |
| 81.5 to 82.5 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 |
| Lead (Pb), % | 0 | |
| 0 to 0.0020 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 0 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 17.5 to 18.5 |
| Phosphorus (P), % | 0 | |
| 0 to 0.0020 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.0010 |