R30021 Cobalt vs. SAE-AISI A7 Steel
R30021 cobalt belongs to the cobalt alloys classification, while SAE-AISI A7 steel belongs to the iron alloys. There are 20 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 R30021 cobalt and the bottom bar is SAE-AISI A7 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 86 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 800 to 2150 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 260 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1470 |
| Melting Onset (Solidus), °C | 1190 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 15 | |
| 37 |
| Thermal Expansion, µm/m-K | 11 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 13 |
| Embodied Energy, MJ/kg | 110 | |
| 200 |
| Embodied Water, L/kg | 520 | |
| 100 |
Common Calculations
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 23 | |
| 29 to 77 |
| Strength to Weight: Bending, points | 21 | |
| 25 to 48 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 10 |
| Thermal Shock Resistance, points | 21 | |
| 27 to 72 |
Alloy Composition
| Carbon (C), % | 0.2 to 0.35 | |
| 2.0 to 2.9 |
| Chromium (Cr), % | 26 to 29 | |
| 5.0 to 5.8 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 to 3.0 | |
| 81.4 to 87.7 |
| Manganese (Mn), % | 0 | |
| 0 to 0.8 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 0.9 to 1.4 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 0 to 0.3 |
| Phosphorus (P), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tungsten (W), % | 0 | |
| 0.5 to 1.5 |
| Vanadium (V), % | 0 | |
| 3.9 to 5.2 |