7050 Aluminum vs. EN 1.7221 Steel
7050 aluminum belongs to the aluminum alloys classification, while EN 1.7221 steel belongs to the iron alloys. There are 29 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 7050 aluminum and the bottom bar is EN 1.7221 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 70 | |
| 190 |
| Elongation at Break, % | 2.2 to 12 | |
| 11 to 17 |
| Fatigue Strength, MPa | 130 to 210 | |
| 290 to 390 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 26 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 490 to 570 | |
| 650 to 780 |
| Tensile Strength: Yield (Proof), MPa | 390 to 500 | |
| 430 to 630 |
Thermal Properties
| Latent Heat of Fusion, J/g | 370 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 190 | |
| 420 |
| Melting Completion (Liquidus), °C | 630 | |
| 1460 |
| Melting Onset (Solidus), °C | 490 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 860 | |
| 470 |
| Thermal Conductivity, W/m-K | 140 | |
| 44 |
| Thermal Expansion, µm/m-K | 24 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 35 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 100 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 10 | |
| 2.4 |
| Density, g/cm3 | 3.1 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 1.5 |
| Embodied Energy, MJ/kg | 150 | |
| 20 |
| Embodied Water, L/kg | 1120 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 10 to 55 | |
| 83 to 98 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1110 to 1760 | |
| 490 to 1050 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 45 | |
| 24 |
| Strength to Weight: Axial, points | 45 to 51 | |
| 23 to 27 |
| Strength to Weight: Bending, points | 45 to 50 | |
| 21 to 24 |
| Thermal Diffusivity, mm2/s | 54 | |
| 12 |
| Thermal Shock Resistance, points | 21 to 25 | |
| 19 to 23 |
Alloy Composition
| Aluminum (Al), % | 87.3 to 92.1 | |
| 0 |
| Carbon (C), % | 0 | |
| 0.22 to 0.29 |
| Chromium (Cr), % | 0 to 0.040 | |
| 0.8 to 1.2 |
| Copper (Cu), % | 2.0 to 2.6 | |
| 0 |
| Iron (Fe), % | 0 to 0.15 | |
| 96.8 to 98.3 |
| Magnesium (Mg), % | 1.9 to 2.6 | |
| 0 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0.5 to 0.8 |
| Molybdenum (Mo), % | 0 | |
| 0.15 to 0.3 |
| Phosphorus (P), % | 0 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 0.12 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 to 0.060 | |
| 0 |
| Zinc (Zn), % | 5.7 to 6.7 | |
| 0 |
| Zirconium (Zr), % | 0.080 to 0.15 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |