R30021 Cobalt vs. ACI-ASTM CF8C Steel
R30021 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CF8C steel belongs to the iron alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is R30021 cobalt and the bottom bar is ACI-ASTM CF8C steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 200 |
| Elongation at Break, % | 9.0 | |
| 40 |
| Fatigue Strength, MPa | 250 | |
| 220 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 86 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 530 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 260 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 300 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1420 |
| Melting Onset (Solidus), °C | 1190 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 15 | |
| 16 |
| Thermal Expansion, µm/m-K | 11 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 2.3 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 3.7 |
| Embodied Energy, MJ/kg | 110 | |
| 53 |
| Embodied Water, L/kg | 520 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 170 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 23 | |
| 19 |
| Strength to Weight: Bending, points | 21 | |
| 19 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 4.3 |
| Thermal Shock Resistance, points | 21 | |
| 11 |
Alloy Composition
| Carbon (C), % | 0.2 to 0.35 | |
| 0 to 0.080 |
| Chromium (Cr), % | 26 to 29 | |
| 18 to 21 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Iron (Fe), % | 0 to 3.0 | |
| 61.8 to 73 |
| Manganese (Mn), % | 0 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 0 to 0.5 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 9.0 to 12 |
| Niobium (Nb), % | 0 | |
| 0 to 1.0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 to 2.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.040 |