Annealed ASTM B628 vs. Annealed R31538 Cobalt
Annealed ASTM B628 belongs to the otherwise unclassified metals classification, while annealed R31538 cobalt belongs to the cobalt alloys. There are 18 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is annealed ASTM B628 and the bottom bar is annealed R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 83 | |
| 220 |
| Elongation at Break, % | 17 | |
| 23 |
| Poisson's Ratio | 0.36 | |
| 0.29 |
| Shear Modulus, GPa | 31 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 350 | |
| 1020 |
Thermal Properties
| Latent Heat of Fusion, J/g | 140 | |
| 320 |
| Melting Completion (Liquidus), °C | 780 | |
| 1360 |
| Melting Onset (Solidus), °C | 780 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 280 | |
| 450 |
| Thermal Expansion, µm/m-K | 19 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 84 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 75 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 10 | |
| 8.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 4.6 | |
| 15 |
| Stiffness to Weight: Bending, points | 14 | |
| 24 |
| Strength to Weight: Axial, points | 9.5 | |
| 34 |
| Strength to Weight: Bending, points | 11 | |
| 27 |
| Thermal Shock Resistance, points | 16 | |
| 25 |
Alloy Composition
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| Aluminum (Al), % | 0 to 0.0050 | |
| 0 |
| Cadmium (Cd), % | 0 to 0.050 | |
| 0 |
| Carbon (C), % | 0 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 0 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.7 to 68.9 |
| Copper (Cu), % | 26.6 to 29 | |
| 0 |
| Iron (Fe), % | 0 to 0.050 | |
| 0 to 0.75 |
| Lead (Pb), % | 0 to 0.030 | |
| 0 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.030 | |
| 0 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Silver (Ag), % | 71 to 73 | |
| 0 |
| Zinc (Zn), % | 0 to 0.060 | |
| 0 |
| Residuals, % | 0 to 0.21 | |
| 0 |