Ductile Cast Iron vs. R30816 Cobalt
Ductile cast iron belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 25 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 R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 to 310 | |
| 280 |
| Elastic (Young's, Tensile) Modulus, GPa | 170 to 180 | |
| 210 |
| Elongation at Break, % | 2.1 to 20 | |
| 23 |
| Poisson's Ratio | 0.28 to 0.31 | |
| 0.3 |
| Shear Modulus, GPa | 64 to 70 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 460 to 920 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 310 to 670 | |
| 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 300 |
| Melting Completion (Liquidus), °C | 1160 | |
| 1540 |
| Melting Onset (Solidus), °C | 1120 | |
| 1460 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 420 |
| Thermal Conductivity, W/m-K | 31 to 36 | |
| 13 |
| Thermal Expansion, µm/m-K | 11 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.1 to 7.5 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 20 |
| Embodied Energy, MJ/kg | 21 | |
| 320 |
| Embodied Water, L/kg | 43 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 17 to 80 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 280 to 1330 | |
| 510 |
| Stiffness to Weight: Axial, points | 12 to 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 to 26 | |
| 22 |
| Strength to Weight: Axial, points | 17 to 35 | |
| 31 |
| Strength to Weight: Bending, points | 18 to 29 | |
| 25 |
| Thermal Diffusivity, mm2/s | 8.9 to 10 | |
| 3.3 |
| Thermal Shock Resistance, points | 17 to 35 | |
| 28 |
Alloy Composition
| Carbon (C), % | 3.0 to 3.5 | |
| 0.32 to 0.42 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 40 to 49.8 |
| Iron (Fe), % | 93.7 to 95.5 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 3.5 to 4.5 |
| Nickel (Ni), % | 0 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 3.5 to 4.5 |
| Phosphorus (P), % | 0 to 0.080 | |
| 0 to 0.040 |
| Silicon (Si), % | 1.5 to 2.8 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 3.5 to 4.5 |
| Tungsten (W), % | 0 | |
| 3.5 to 4.5 |