Annealed ASTM B685 Alloy vs. Annealed R30008 Cobalt
Annealed ASTM B685 alloy belongs to the otherwise unclassified metals classification, while annealed R30008 cobalt belongs to the cobalt alloys. There are 16 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is annealed ASTM B685 alloy and the bottom bar is annealed R30008 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 120 | |
| 210 |
| Elongation at Break, % | 23 | |
| 73 |
| Poisson's Ratio | 0.37 | |
| 0.29 |
| Shear Modulus, GPa | 43 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 660 | |
| 950 |
Thermal Properties
| Latent Heat of Fusion, J/g | 180 | |
| 320 |
| Melting Completion (Liquidus), °C | 1230 | |
| 1400 |
| Melting Onset (Solidus), °C | 1200 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 300 | |
| 450 |
| Thermal Expansion, µm/m-K | 14 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 11 | |
| 8.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 6.1 | |
| 14 |
| Stiffness to Weight: Bending, points | 15 | |
| 24 |
| Strength to Weight: Axial, points | 17 | |
| 31 |
| Strength to Weight: Bending, points | 16 | |
| 25 |
| Thermal Shock Resistance, points | 28 | |
| 25 |
Alloy Composition
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| Aluminum (Al), % | 0 to 0.0050 | |
| 0 |
| Boron (B), % | 0 | |
| 0 to 0.0010 |
| Cadmium (Cd), % | 0 to 0.050 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0 | |
| 18.5 to 21.5 |
| Cobalt (Co), % | 0 | |
| 39 to 42 |
| Copper (Cu), % | 39.5 to 40.5 | |
| 0 |
| Iron (Fe), % | 0 to 0.050 | |
| 7.6 to 20 |
| Lead (Pb), % | 0 to 0.030 | |
| 0 |
| Manganese (Mn), % | 0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 6.5 to 7.5 |
| Nickel (Ni), % | 0 | |
| 15 to 18 |
| Palladium (Pd), % | 59 to 60.5 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 | |
| 0 to 1.2 |
| Silver (Ag), % | 0 to 0.1 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Zinc (Zn), % | 0 to 0.060 | |
| 0 |
| Residuals, % | 0 to 0.2 | |
| 0 |