R30008 Cobalt vs. Ductile Cast Iron
R30008 cobalt belongs to the cobalt alloys classification, while ductile cast iron belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is R30008 cobalt and the bottom bar is ductile cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 170 to 180 |
| Elongation at Break, % | 1.1 to 73 | |
| 2.1 to 20 |
| Poisson's Ratio | 0.29 | |
| 0.28 to 0.31 |
| Shear Modulus, GPa | 83 | |
| 64 to 70 |
| Tensile Strength: Ultimate (UTS), MPa | 950 to 1700 | |
| 460 to 920 |
| Tensile Strength: Yield (Proof), MPa | 500 to 1080 | |
| 310 to 670 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 270 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1160 |
| Melting Onset (Solidus), °C | 1330 | |
| 1120 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 490 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 95 | |
| 1.9 |
| Density, g/cm3 | 8.4 | |
| 7.1 to 7.5 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 1.5 |
| Embodied Energy, MJ/kg | 110 | |
| 21 |
| Embodied Water, L/kg | 400 | |
| 43 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 2720 | |
| 280 to 1330 |
| Stiffness to Weight: Axial, points | 14 | |
| 12 to 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 to 26 |
| Strength to Weight: Axial, points | 31 to 56 | |
| 17 to 35 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 18 to 29 |
| Thermal Shock Resistance, points | 25 to 44 | |
| 17 to 35 |
Alloy Composition
| Boron (B), % | 0 to 0.0010 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 3.0 to 3.5 |
| Chromium (Cr), % | 18.5 to 21.5 | |
| 0 |
| Cobalt (Co), % | 39 to 42 | |
| 0 |
| Iron (Fe), % | 7.6 to 20 | |
| 93.7 to 95.5 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 6.5 to 7.5 | |
| 0 |
| Nickel (Ni), % | 15 to 18 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.080 |
| Silicon (Si), % | 0 to 1.2 | |
| 1.5 to 2.8 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 |