Ductile Cast Iron vs. R30008 Cobalt
Ductile cast iron belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt 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 ductile cast iron and the bottom bar is R30008 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 170 to 180 | |
| 210 |
| Elongation at Break, % | 2.1 to 20 | |
| 1.1 to 73 |
| Poisson's Ratio | 0.28 to 0.31 | |
| 0.29 |
| Shear Modulus, GPa | 64 to 70 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 460 to 920 | |
| 950 to 1700 |
| Tensile Strength: Yield (Proof), MPa | 310 to 670 | |
| 500 to 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 320 |
| Melting Completion (Liquidus), °C | 1160 | |
| 1400 |
| Melting Onset (Solidus), °C | 1120 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 450 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 | |
| 95 |
| Density, g/cm3 | 7.1 to 7.5 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 8.1 |
| Embodied Energy, MJ/kg | 21 | |
| 110 |
| Embodied Water, L/kg | 43 | |
| 400 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 280 to 1330 | |
| 590 to 2720 |
| Stiffness to Weight: Axial, points | 12 to 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 to 26 | |
| 24 |
| Strength to Weight: Axial, points | 17 to 35 | |
| 31 to 56 |
| Strength to Weight: Bending, points | 18 to 29 | |
| 25 to 37 |
| Thermal Shock Resistance, points | 17 to 35 | |
| 25 to 44 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.0010 |
| Carbon (C), % | 3.0 to 3.5 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0 | |
| 18.5 to 21.5 |
| Cobalt (Co), % | 0 | |
| 39 to 42 |
| Iron (Fe), % | 93.7 to 95.5 | |
| 7.6 to 20 |
| Manganese (Mn), % | 0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 6.5 to 7.5 |
| Nickel (Ni), % | 0 | |
| 15 to 18 |
| Phosphorus (P), % | 0 to 0.080 | |
| 0 to 0.015 |
| Silicon (Si), % | 1.5 to 2.8 | |
| 0 to 1.2 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |