R30003 Cobalt vs. SAE-AISI A3 Steel
R30003 cobalt belongs to the cobalt alloys classification, while SAE-AISI A3 steel belongs to the iron alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is R30003 cobalt and the bottom bar is SAE-AISI A3 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 83 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 970 to 1720 | |
| 700 to 2150 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 260 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1450 |
| Melting Onset (Solidus), °C | 1440 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 37 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 8.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 9.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 95 | |
| 6.0 |
| Density, g/cm3 | 8.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 4.4 |
| Embodied Energy, MJ/kg | 110 | |
| 67 |
| Embodied Water, L/kg | 400 | |
| 78 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 32 to 57 | |
| 25 to 77 |
| Strength to Weight: Bending, points | 26 to 38 | |
| 23 to 48 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 10 |
| Thermal Shock Resistance, points | 26 to 45 | |
| 23 to 70 |
Alloy Composition
| Boron (B), % | 0 to 0.1 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 1.2 to 1.3 |
| Chromium (Cr), % | 19 to 21 | |
| 4.8 to 5.5 |
| Cobalt (Co), % | 39 to 41 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 10 to 20.5 | |
| 88.7 to 92 |
| Manganese (Mn), % | 1.5 to 2.5 | |
| 0.4 to 0.6 |
| Molybdenum (Mo), % | 6.0 to 8.0 | |
| 0.9 to 1.4 |
| Nickel (Ni), % | 14 to 16 | |
| 0 to 0.3 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |
| Vanadium (V), % | 0 | |
| 0.8 to 1.4 |