2018 Aluminum vs. SAE-AISI 1055 Steel
2018 aluminum belongs to the aluminum alloys classification, while SAE-AISI 1055 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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 2018 aluminum and the bottom bar is SAE-AISI 1055 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 120 | |
| 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 73 | |
| 190 |
| Elongation at Break, % | 9.6 | |
| 11 to 14 |
| Fatigue Strength, MPa | 120 | |
| 260 to 390 |
| Poisson's Ratio | 0.33 | |
| 0.29 |
| Shear Modulus, GPa | 27 | |
| 72 |
| Shear Strength, MPa | 270 | |
| 440 to 450 |
| Tensile Strength: Ultimate (UTS), MPa | 420 | |
| 730 to 750 |
| Tensile Strength: Yield (Proof), MPa | 310 | |
| 400 to 630 |
Thermal Properties
| Latent Heat of Fusion, J/g | 390 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 220 | |
| 400 |
| Melting Completion (Liquidus), °C | 640 | |
| 1460 |
| Melting Onset (Solidus), °C | 510 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 470 |
| Thermal Conductivity, W/m-K | 150 | |
| 51 |
| Thermal Expansion, µm/m-K | 22 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 40 | |
| 11 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 120 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 11 | |
| 1.8 |
| Density, g/cm3 | 3.1 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 1.4 |
| Embodied Energy, MJ/kg | 150 | |
| 18 |
| Embodied Water, L/kg | 1130 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 37 | |
| 80 to 85 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 670 | |
| 440 to 1070 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 45 | |
| 24 |
| Strength to Weight: Axial, points | 38 | |
| 26 |
| Strength to Weight: Bending, points | 41 | |
| 23 |
| Thermal Diffusivity, mm2/s | 57 | |
| 14 |
| Thermal Shock Resistance, points | 19 | |
| 23 to 24 |
Alloy Composition
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| Aluminum (Al), % | 89.7 to 94.4 | |
| 0 |
| Carbon (C), % | 0 | |
| 0.5 to 0.6 |
| Chromium (Cr), % | 0 to 0.1 | |
| 0 |
| Copper (Cu), % | 3.5 to 4.5 | |
| 0 |
| Iron (Fe), % | 0 to 1.0 | |
| 98.4 to 98.9 |
| Magnesium (Mg), % | 0.45 to 0.9 | |
| 0 |
| Manganese (Mn), % | 0 to 0.2 | |
| 0.6 to 0.9 |
| Nickel (Ni), % | 1.7 to 2.3 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.9 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.050 |
| Zinc (Zn), % | 0 to 0.25 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |