Automotive Grey Cast Iron vs. ASTM A227 Spring Steel
Both automotive grey cast iron and ASTM A227 spring steel are iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 A227 spring steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 to 280 | |
| 500 to 640 |
| Elastic (Young's, Tensile) Modulus, GPa | 180 | |
| 190 |
| Elongation at Break, % | 9.6 to 14 | |
| 12 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 69 to 70 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 140 to 290 | |
| 1720 to 2220 |
| Tensile Strength: Yield (Proof), MPa | 94 to 200 | |
| 1430 to 1850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 to 280 | |
| 250 |
| Melting Completion (Liquidus), °C | 1380 to 1390 | |
| 1450 |
| Melting Onset (Solidus), °C | 1340 to 1350 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 490 | |
| 470 |
| Thermal Conductivity, W/m-K | 41 to 43 | |
| 52 |
| Thermal Expansion, µm/m-K | 12 to 14 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 to 7.6 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 to 9.1 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 to 3.0 | |
| 1.8 |
| Density, g/cm3 | 7.5 to 7.6 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 to 1.7 | |
| 1.4 |
| Embodied Energy, MJ/kg | 21 to 24 | |
| 19 |
| Embodied Water, L/kg | 44 to 51 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 18 to 25 | |
| 200 to 260 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 5.2 to 11 | |
| 61 to 79 |
| Strength to Weight: Bending, points | 8.0 to 13 | |
| 41 to 48 |
| Thermal Diffusivity, mm2/s | 11 to 12 | |
| 14 |
| Thermal Shock Resistance, points | 4.2 to 8.6 | |
| 55 to 71 |