Automotive Grey Cast Iron vs. Austempered Cast Iron
Both automotive grey cast iron and austempered cast iron are iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is automotive grey cast iron and the bottom bar is austempered cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 to 280 | |
| 270 to 490 |
| Elastic (Young's, Tensile) Modulus, GPa | 180 | |
| 180 |
| Elongation at Break, % | 9.6 to 14 | |
| 1.1 to 13 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 69 to 70 | |
| 62 to 69 |
| Tensile Strength: Ultimate (UTS), MPa | 140 to 290 | |
| 860 to 1800 |
| Tensile Strength: Yield (Proof), MPa | 94 to 200 | |
| 560 to 1460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 to 280 | |
| 280 |
| Melting Completion (Liquidus), °C | 1380 to 1390 | |
| 1380 |
| Melting Onset (Solidus), °C | 1340 to 1350 | |
| 1340 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 490 |
| Thermal Conductivity, W/m-K | 41 to 43 | |
| 42 |
| Thermal Expansion, µm/m-K | 12 to 14 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 to 3.0 | |
| 2.9 |
| Density, g/cm3 | 7.5 to 7.6 | |
| 7.5 |
| Embodied Carbon, kg CO2/kg material | 1.5 to 1.7 | |
| 1.8 |
| Embodied Energy, MJ/kg | 21 to 24 | |
| 25 |
| Embodied Water, L/kg | 44 to 51 | |
| 48 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 18 to 25 | |
| 19 to 95 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 25 to 110 | |
| 880 to 3970 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 5.2 to 11 | |
| 32 to 66 |
| Strength to Weight: Bending, points | 8.0 to 13 | |
| 27 to 44 |
| Thermal Diffusivity, mm2/s | 11 to 12 | |
| 11 |
| Thermal Shock Resistance, points | 4.2 to 8.6 | |
| 25 to 53 |