Ductile Cast Iron vs. R31538 Cobalt
Ductile cast iron belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 26 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 R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 170 to 180 | |
| 220 |
| Elongation at Break, % | 2.1 to 20 | |
| 13 to 23 |
| Poisson's Ratio | 0.28 to 0.31 | |
| 0.29 |
| Shear Modulus, GPa | 64 to 70 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 460 to 920 | |
| 1020 to 1360 |
| Tensile Strength: Yield (Proof), MPa | 310 to 670 | |
| 580 to 930 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 320 |
| Melting Completion (Liquidus), °C | 1160 | |
| 1360 |
| Melting Onset (Solidus), °C | 1120 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 450 |
| Thermal Conductivity, W/m-K | 31 to 36 | |
| 13 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 to 9.4 | |
| 2.1 |
Otherwise Unclassified Properties
| 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 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 17 to 80 | |
| 140 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 280 to 1330 | |
| 750 to 1920 |
| Stiffness to Weight: Axial, points | 12 to 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 to 26 | |
| 24 |
| Strength to Weight: Axial, points | 17 to 35 | |
| 34 to 45 |
| Strength to Weight: Bending, points | 18 to 29 | |
| 27 to 32 |
| Thermal Diffusivity, mm2/s | 8.9 to 10 | |
| 3.5 |
| Thermal Shock Resistance, points | 17 to 35 | |
| 25 to 33 |
Alloy Composition
| Carbon (C), % | 3.0 to 3.5 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 0 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.7 to 68.9 |
| Iron (Fe), % | 93.7 to 95.5 | |
| 0 to 0.75 |
| Manganese (Mn), % | 0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.080 | |
| 0 |
| Silicon (Si), % | 1.5 to 2.8 | |
| 0 to 1.0 |