R30008 Cobalt vs. ASTM B780 Alloy
R30008 cobalt belongs to the cobalt alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. There are 14 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 R30008 cobalt and the bottom bar is ASTM B780 alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 83 |
| Elongation at Break, % | 1.1 to 73 | |
| 1.1 to 9.1 |
| Poisson's Ratio | 0.29 | |
| 0.36 |
| Shear Modulus, GPa | 83 | |
| 30 |
| Tensile Strength: Ultimate (UTS), MPa | 950 to 1700 | |
| 330 to 590 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 140 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 270 |
| Thermal Expansion, µm/m-K | 13 | |
| 18 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 10 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 4.5 |
| Stiffness to Weight: Bending, points | 24 | |
| 14 |
| Strength to Weight: Axial, points | 31 to 56 | |
| 9.1 to 16 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 11 to 15 |
| Thermal Shock Resistance, points | 25 to 44 | |
| 16 to 29 |
Alloy Composition
| Boron (B), % | 0 to 0.0010 | |
| 0 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.050 |
| Carbon (C), % | 0 to 0.15 | |
| 0 |
| Chromium (Cr), % | 18.5 to 21.5 | |
| 0 |
| Cobalt (Co), % | 39 to 42 | |
| 0 |
| Copper (Cu), % | 0 | |
| 23.5 to 25.7 |
| Iron (Fe), % | 7.6 to 20 | |
| 0 to 0.050 |
| Lead (Pb), % | 0 | |
| 0 to 0.030 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 6.5 to 7.5 | |
| 0 |
| Nickel (Ni), % | 15 to 18 | |
| 0.35 to 0.65 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 |
| Silver (Ag), % | 0 | |
| 74 to 76 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.060 |