Automotive Grey Cast Iron vs. ASTM B685 Alloy
Automotive grey cast iron belongs to the iron alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is automotive grey cast iron and the bottom bar is ASTM B685 alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 180 | |
| 120 |
| Poisson's Ratio | 0.29 | |
| 0.37 |
| Shear Modulus, GPa | 69 to 70 | |
| 43 |
| Tensile Strength: Ultimate (UTS), MPa | 140 to 290 | |
| 660 to 1060 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 to 280 | |
| 180 |
| Melting Completion (Liquidus), °C | 1380 to 1390 | |
| 1230 |
| Melting Onset (Solidus), °C | 1340 to 1350 | |
| 1200 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 300 |
| Thermal Expansion, µm/m-K | 12 to 14 | |
| 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 to 7.6 | |
| 5.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 to 9.1 | |
| 4.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.5 to 7.6 | |
| 11 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 6.1 |
| Stiffness to Weight: Bending, points | 25 | |
| 15 |
| Strength to Weight: Axial, points | 5.2 to 11 | |
| 17 to 27 |
| Strength to Weight: Bending, points | 8.0 to 13 | |
| 16 to 21 |
| Thermal Shock Resistance, points | 4.2 to 8.6 | |
| 28 to 46 |