R31538 Cobalt vs. AWS BNi-7
R31538 cobalt belongs to the cobalt alloys classification, while AWS BNi-7 belongs to the nickel alloys. There are 18 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.
For each property being compared, the top bar is R31538 cobalt and the bottom bar is AWS BNi-7.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 170 |
| Poisson's Ratio | 0.29 | |
| 0.3 |
| Shear Modulus, GPa | 86 | |
| 67 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 550 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 280 |
| Melting Completion (Liquidus), °C | 1360 | |
| 890 |
| Melting Onset (Solidus), °C | 1290 | |
| 890 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 490 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.0 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 8.8 |
| Embodied Energy, MJ/kg | 110 | |
| 120 |
| Embodied Water, L/kg | 530 | |
| 240 |
Common Calculations
| Stiffness to Weight: Axial, points | 15 | |
| 12 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 19 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 19 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 21 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 0 to 0.050 |
| Boron (B), % | 0 | |
| 0 to 0.010 |
| Carbon (C), % | 0.15 to 0.35 | |
| 0 to 0.060 |
| Chromium (Cr), % | 26 to 30 | |
| 13 to 15 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 0 to 0.1 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.2 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 0.040 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 73.3 to 77.3 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 9.7 to 10.5 |
| Selenium (Se), % | 0 | |
| 0 to 0.0050 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.1 |
| Sulfur (S), % | 0 | |
| 0 to 0.020 |
| Titanium (Ti), % | 0 | |
| 0 to 0.050 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.050 |
| Residuals, % | 0 | |
| 0 to 0.5 |