Ductile Cast Iron vs. R30605 Cobalt
Ductile cast iron belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt alloys. 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 ductile cast iron and the bottom bar is R30605 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 170 to 180 | |
| 210 |
| Elongation at Break, % | 2.1 to 20 | |
| 34 |
| Poisson's Ratio | 0.28 to 0.31 | |
| 0.29 |
| Shear Modulus, GPa | 64 to 70 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 460 to 920 | |
| 1130 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 310 to 670 | |
| 470 to 1600 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 290 |
| Melting Completion (Liquidus), °C | 1160 | |
| 1410 |
| Melting Onset (Solidus), °C | 1120 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 410 |
| Thermal Conductivity, W/m-K | 31 to 36 | |
| 9.6 |
| Thermal Expansion, µm/m-K | 11 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 to 9.4 | |
| 1.8 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.1 to 7.5 | |
| 9.6 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 9.8 |
| Embodied Energy, MJ/kg | 21 | |
| 140 |
| Embodied Water, L/kg | 43 | |
| 450 |
Common Calculations
| Stiffness to Weight: Axial, points | 12 to 14 | |
| 12 |
| Stiffness to Weight: Bending, points | 24 to 26 | |
| 21 |
| Strength to Weight: Axial, points | 17 to 35 | |
| 33 to 55 |
| Strength to Weight: Bending, points | 18 to 29 | |
| 25 to 36 |
| Thermal Diffusivity, mm2/s | 8.9 to 10 | |
| 2.5 |
| Thermal Shock Resistance, points | 17 to 35 | |
| 31 to 52 |
Alloy Composition
| Carbon (C), % | 3.0 to 3.5 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 46.4 to 57 |
| Iron (Fe), % | 93.7 to 95.5 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0 | |
| 1.0 to 2.0 |
| Nickel (Ni), % | 0 | |
| 9.0 to 11 |
| Phosphorus (P), % | 0 to 0.080 | |
| 0 to 0.040 |
| Silicon (Si), % | 1.5 to 2.8 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tungsten (W), % | 0 | |
| 14 to 16 |