Ductile Cast Iron vs. Austempered Cast Iron
Both ductile cast iron and austempered cast iron are iron alloys. They have a very high 97% of their average alloy composition in common. 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 ductile cast iron and the bottom bar is austempered cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 to 310 | |
| 270 to 490 |
| Elastic (Young's, Tensile) Modulus, GPa | 170 to 180 | |
| 180 |
| Elongation at Break, % | 2.1 to 20 | |
| 1.1 to 13 |
| Poisson's Ratio | 0.28 to 0.31 | |
| 0.29 |
| Shear Modulus, GPa | 64 to 70 | |
| 62 to 69 |
| Tensile Strength: Ultimate (UTS), MPa | 460 to 920 | |
| 860 to 1800 |
| Tensile Strength: Yield (Proof), MPa | 310 to 670 | |
| 560 to 1460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 280 |
| Melting Completion (Liquidus), °C | 1160 | |
| 1380 |
| Melting Onset (Solidus), °C | 1120 | |
| 1340 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 490 |
| Thermal Conductivity, W/m-K | 31 to 36 | |
| 42 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 | |
| 2.9 |
| Density, g/cm3 | 7.1 to 7.5 | |
| 7.5 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.8 |
| Embodied Energy, MJ/kg | 21 | |
| 25 |
| Embodied Water, L/kg | 43 | |
| 48 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 17 to 80 | |
| 19 to 95 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 280 to 1330 | |
| 880 to 3970 |
| Stiffness to Weight: Axial, points | 12 to 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 to 26 | |
| 25 |
| Strength to Weight: Axial, points | 17 to 35 | |
| 32 to 66 |
| Strength to Weight: Bending, points | 18 to 29 | |
| 27 to 44 |
| Thermal Diffusivity, mm2/s | 8.9 to 10 | |
| 11 |
| Thermal Shock Resistance, points | 17 to 35 | |
| 25 to 53 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.050 |
| Arsenic (As), % | 0 | |
| 0 to 0.020 |
| Carbon (C), % | 3.0 to 3.5 | |
| 3.4 to 3.8 |
| Chromium (Cr), % | 0 | |
| 0 to 0.1 |
| Copper (Cu), % | 0 | |
| 0 to 0.8 |
| Iron (Fe), % | 93.7 to 95.5 | |
| 89.6 to 94 |
| Magnesium (Mg), % | 0 | |
| 0 to 0.040 |
| Manganese (Mn), % | 0 | |
| 0.3 to 0.4 |
| Molybdenum (Mo), % | 0 | |
| 0 to 0.3 |
| Nickel (Ni), % | 0 | |
| 0 to 2.0 |
| Phosphorus (P), % | 0 to 0.080 | |
| 0 to 0.040 |
| Selenium (Se), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 1.5 to 2.8 | |
| 2.3 to 2.7 |
| Sulfur (S), % | 0 | |
| 0 to 0.020 |
| Tin (Sn), % | 0 | |
| 0 to 0.020 |
| Vanadium (V), % | 0 | |
| 0 to 0.1 |