R31538 Cobalt vs. Ductile Cast Iron
R31538 cobalt belongs to the cobalt alloys classification, while ductile cast iron belongs to the iron 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 R31538 cobalt and the bottom bar is ductile cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 170 to 180 |
| Elongation at Break, % | 13 to 23 | |
| 2.1 to 20 |
| Poisson's Ratio | 0.29 | |
| 0.28 to 0.31 |
| Shear Modulus, GPa | 86 | |
| 64 to 70 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 460 to 920 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 310 to 670 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 270 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1160 |
| Melting Onset (Solidus), °C | 1290 | |
| 1120 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 490 |
| Thermal Conductivity, W/m-K | 13 | |
| 31 to 36 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 8.8 to 9.4 |
Otherwise Unclassified Properties
| 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 | 530 | |
| 43 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 17 to 80 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 280 to 1330 |
| Stiffness to Weight: Axial, points | 15 | |
| 12 to 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 to 26 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 17 to 35 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 18 to 29 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 8.9 to 10 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 17 to 35 |
Alloy Composition
| Carbon (C), % | 0.15 to 0.35 | |
| 3.0 to 3.5 |
| Chromium (Cr), % | 26 to 30 | |
| 0 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 0 |
| Iron (Fe), % | 0 to 0.75 | |
| 93.7 to 95.5 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.080 |
| Silicon (Si), % | 0 to 1.0 | |
| 1.5 to 2.8 |