Automotive Malleable Cast Iron vs. R30021 Cobalt
Automotive malleable cast iron belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is automotive malleable cast iron and the bottom bar is R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 180 | |
| 220 |
| Elongation at Break, % | 1.0 to 10 | |
| 9.0 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 70 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 350 to 720 | |
| 700 |
| Tensile Strength: Yield (Proof), MPa | 220 to 590 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 330 |
| Melting Completion (Liquidus), °C | 1410 | |
| 1350 |
| Melting Onset (Solidus), °C | 1370 | |
| 1190 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 450 |
| Thermal Conductivity, W/m-K | 41 | |
| 15 |
| Thermal Expansion, µm/m-K | 14 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 1.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.7 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.6 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 8.0 |
| Embodied Energy, MJ/kg | 20 | |
| 110 |
| Embodied Water, L/kg | 45 | |
| 520 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 6.8 to 30 | |
| 57 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 130 to 950 | |
| 570 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 13 to 26 | |
| 23 |
| Strength to Weight: Bending, points | 14 to 24 | |
| 21 |
| Thermal Diffusivity, mm2/s | 11 | |
| 3.8 |
| Thermal Shock Resistance, points | 9.9 to 21 | |
| 21 |
Alloy Composition
| Carbon (C), % | 2.2 to 2.9 | |
| 0.2 to 0.35 |
| Chromium (Cr), % | 0 | |
| 26 to 29 |
| Cobalt (Co), % | 0 | |
| 61.7 to 67.3 |
| Iron (Fe), % | 93.6 to 96.7 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0.15 to 1.3 | |
| 0 |
| Molybdenum (Mo), % | 0 | |
| 4.5 to 6.0 |
| Nickel (Ni), % | 0 | |
| 2.0 to 3.0 |
| Phosphorus (P), % | 0.020 to 0.15 | |
| 0 |
| Silicon (Si), % | 0.9 to 1.9 | |
| 0 to 1.5 |
| Sulfur (S), % | 0.020 to 0.2 | |
| 0 |