ASTM A231 Spring Steel vs. 355.0 Aluminum
ASTM A231 spring steel belongs to the iron alloys classification, while 355.0 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is ASTM A231 spring steel and the bottom bar is 355.0 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 540 | |
| 72 to 83 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 71 |
| Elongation at Break, % | 14 | |
| 1.5 to 2.6 |
| Fatigue Strength, MPa | 1000 | |
| 55 to 70 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 73 | |
| 27 |
| Shear Strength, MPa | 1080 | |
| 150 to 240 |
| Tensile Strength: Ultimate (UTS), MPa | 1790 | |
| 200 to 260 |
| Tensile Strength: Yield (Proof), MPa | 1570 | |
| 150 to 190 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 470 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 180 |
| Melting Completion (Liquidus), °C | 1460 | |
| 620 |
| Melting Onset (Solidus), °C | 1410 | |
| 560 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 890 |
| Thermal Conductivity, W/m-K | 52 | |
| 150 to 170 |
| Thermal Expansion, µm/m-K | 13 | |
| 22 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 38 to 43 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 120 to 140 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.3 | |
| 9.5 |
| Density, g/cm3 | 7.8 | |
| 2.7 |
| Embodied Carbon, kg CO2/kg material | 2.0 | |
| 8.0 |
| Embodied Energy, MJ/kg | 28 | |
| 150 |
| Embodied Water, L/kg | 51 | |
| 1120 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 2.7 to 5.9 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 51 |
| Strength to Weight: Axial, points | 64 | |
| 20 to 27 |
| Strength to Weight: Bending, points | 42 | |
| 28 to 33 |
| Thermal Diffusivity, mm2/s | 14 | |
| 60 to 69 |
| Thermal Shock Resistance, points | 53 | |
| 9.1 to 12 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 90.3 to 94.1 |
| Carbon (C), % | 0.48 to 0.53 | |
| 0 |
| Chromium (Cr), % | 0.8 to 1.1 | |
| 0 to 0.25 |
| Copper (Cu), % | 0 | |
| 1.0 to 1.5 |
| Iron (Fe), % | 96.7 to 97.7 | |
| 0 to 0.6 |
| Magnesium (Mg), % | 0 | |
| 0.4 to 0.6 |
| Manganese (Mn), % | 0.7 to 0.9 | |
| 0 to 0.5 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 4.5 to 5.5 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 0 to 0.25 |
| Vanadium (V), % | 0.15 to 0.3 | |
| 0 |
| Zinc (Zn), % | 0 | |
| 0 to 0.35 |
| Residuals, % | 0 | |
| 0 to 0.15 |