Austempered Cast Iron vs. R31537 Cobalt
Austempered cast iron belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. There are 24 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is austempered cast iron and the bottom bar is R31537 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 180 | |
| 220 |
| Elongation at Break, % | 1.1 to 13 | |
| 14 to 23 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 62 to 69 | |
| 87 |
| Tensile Strength: Ultimate (UTS), MPa | 860 to 1800 | |
| 1000 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 560 to 1460 | |
| 590 to 940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 320 |
| Melting Completion (Liquidus), °C | 1380 | |
| 1360 |
| Melting Onset (Solidus), °C | 1340 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 450 |
| Thermal Conductivity, W/m-K | 42 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.5 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 8.1 |
| Embodied Energy, MJ/kg | 25 | |
| 110 |
| Embodied Water, L/kg | 48 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 19 to 95 | |
| 140 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 880 to 3970 | |
| 780 to 1990 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 32 to 66 | |
| 33 to 44 |
| Strength to Weight: Bending, points | 27 to 44 | |
| 26 to 32 |
| Thermal Diffusivity, mm2/s | 11 | |
| 3.4 |
| Thermal Shock Resistance, points | 25 to 53 | |
| 24 to 32 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.050 | |
| 0 |
| Arsenic (As), % | 0 to 0.020 | |
| 0 |
| Carbon (C), % | 3.4 to 3.8 | |
| 0 to 0.14 |
| Chromium (Cr), % | 0 to 0.1 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.9 to 69 |
| Copper (Cu), % | 0 to 0.8 | |
| 0 |
| Iron (Fe), % | 89.6 to 94 | |
| 0 to 0.75 |
| Magnesium (Mg), % | 0 to 0.040 | |
| 0 |
| Manganese (Mn), % | 0.3 to 0.4 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 to 0.3 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 to 2.0 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Selenium (Se), % | 0 to 0.030 | |
| 0 |
| Silicon (Si), % | 2.3 to 2.7 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.020 | |
| 0 |
| Tin (Sn), % | 0 to 0.020 | |
| 0 |
| Vanadium (V), % | 0 to 0.1 | |
| 0 |