ACI-ASTM CB30 Steel vs. R31233 Cobalt
ACI-ASTM CB30 steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is ACI-ASTM CB30 steel and the bottom bar is R31233 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 85 |
| Tensile Strength: Ultimate (UTS), MPa | 500 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 230 | |
| 420 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 320 |
| Melting Completion (Liquidus), °C | 1430 | |
| 1350 |
| Melting Onset (Solidus), °C | 1380 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 440 |
| Thermal Conductivity, W/m-K | 21 | |
| 12 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.5 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 3.0 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.7 | |
| 8.6 |
| Embodied Carbon, kg CO2/kg material | 2.3 | |
| 8.4 |
| Embodied Energy, MJ/kg | 33 | |
| 110 |
| Embodied Water, L/kg | 130 | |
| 480 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 140 | |
| 410 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 23 |
| Strength to Weight: Axial, points | 18 | |
| 33 |
| Strength to Weight: Bending, points | 18 | |
| 26 |
| Thermal Diffusivity, mm2/s | 5.6 | |
| 3.2 |
| Thermal Shock Resistance, points | 17 | |
| 25 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0 to 0.3 | |
| 0.020 to 0.1 |
| Chromium (Cr), % | 18 to 21 | |
| 23.5 to 27.5 |
| Cobalt (Co), % | 0 | |
| 44.7 to 63.3 |
| Copper (Cu), % | 0 to 1.2 | |
| 0 |
| Iron (Fe), % | 72.9 to 82 | |
| 1.0 to 5.0 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.1 to 1.5 |
| Molybdenum (Mo), % | 0 | |
| 4.0 to 6.0 |
| Nickel (Ni), % | 0 to 2.0 | |
| 7.0 to 11 |
| Nitrogen (N), % | 0 | |
| 0.030 to 0.12 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 1.5 | |
| 0.050 to 1.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.020 |
| Tungsten (W), % | 0 | |
| 1.0 to 3.0 |