ASTM A229 Spring Steel vs. Automotive Grey Cast Iron
Both ASTM A229 spring steel and automotive grey cast iron are iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is ASTM A229 spring steel and the bottom bar is automotive grey cast iron.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 490 to 550 | |
| 160 to 280 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 180 |
| Elongation at Break, % | 14 | |
| 9.6 to 14 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 69 to 70 |
| Tensile Strength: Ultimate (UTS), MPa | 1690 to 1890 | |
| 140 to 290 |
| Tensile Strength: Yield (Proof), MPa | 1100 to 1230 | |
| 94 to 200 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 260 to 280 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1380 to 1390 |
| Melting Onset (Solidus), °C | 1410 | |
| 1340 to 1350 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 490 |
| Thermal Conductivity, W/m-K | 50 | |
| 41 to 43 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 to 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 7.4 to 7.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 8.8 to 9.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 1.9 to 3.0 |
| Density, g/cm3 | 7.8 | |
| 7.5 to 7.6 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.5 to 1.7 |
| Embodied Energy, MJ/kg | 19 | |
| 21 to 24 |
| Embodied Water, L/kg | 46 | |
| 44 to 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 230 | |
| 18 to 25 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3260 to 4080 | |
| 25 to 110 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 60 to 67 | |
| 5.2 to 11 |
| Strength to Weight: Bending, points | 40 to 43 | |
| 8.0 to 13 |
| Thermal Diffusivity, mm2/s | 14 | |
| 11 to 12 |
| Thermal Shock Resistance, points | 54 to 60 | |
| 4.2 to 8.6 |