R30816 Cobalt vs. ACI-ASTM CB7Cu-1 Steel
R30816 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CB7Cu-1 steel belongs to the iron alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is ACI-ASTM CB7Cu-1 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 300 to 420 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 23 | |
| 5.7 to 11 |
| Fatigue Strength, MPa | 250 | |
| 420 to 590 |
| Poisson's Ratio | 0.3 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 960 to 1350 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 760 to 1180 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 280 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1430 |
| Melting Onset (Solidus), °C | 1460 | |
| 1500 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 480 |
| Thermal Conductivity, W/m-K | 13 | |
| 17 |
| Thermal Expansion, µm/m-K | 12 | |
| 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 2.6 |
| Embodied Energy, MJ/kg | 320 | |
| 38 |
| Embodied Water, L/kg | 440 | |
| 130 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 71 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 1500 to 3590 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 22 | |
| 25 |
| Strength to Weight: Axial, points | 31 | |
| 34 to 48 |
| Strength to Weight: Bending, points | 25 | |
| 28 to 35 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 4.6 |
| Thermal Shock Resistance, points | 28 | |
| 32 to 45 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 to 0.070 |
| Chromium (Cr), % | 19 to 21 | |
| 15.5 to 17.7 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Copper (Cu), % | 0 | |
| 2.5 to 3.2 |
| Iron (Fe), % | 0 to 5.0 | |
| 72.3 to 78.4 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 0.7 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 3.6 to 4.6 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 to 0.35 |
| Nitrogen (N), % | 0 | |
| 0 to 0.050 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |