7020 Aluminum vs. AISI 303 Stainless Steel
7020 aluminum belongs to the aluminum alloys classification, while AISI 303 stainless steel belongs to the iron alloys. There are 31 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 7020 aluminum and the bottom bar is AISI 303 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 45 to 100 | |
| 170 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 70 | |
| 200 |
| Elongation at Break, % | 8.4 to 14 | |
| 40 to 51 |
| Fatigue Strength, MPa | 110 to 130 | |
| 230 to 360 |
| Poisson's Ratio | 0.33 | |
| 0.28 |
| Shear Modulus, GPa | 26 | |
| 77 |
| Shear Strength, MPa | 110 to 230 | |
| 430 to 470 |
| Tensile Strength: Ultimate (UTS), MPa | 190 to 390 | |
| 600 to 690 |
| Tensile Strength: Yield (Proof), MPa | 120 to 310 | |
| 230 to 420 |
Thermal Properties
| Latent Heat of Fusion, J/g | 380 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 210 | |
| 930 |
| Melting Completion (Liquidus), °C | 650 | |
| 1450 |
| Melting Onset (Solidus), °C | 610 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 880 | |
| 480 |
| Thermal Conductivity, W/m-K | 150 | |
| 16 |
| Thermal Expansion, µm/m-K | 23 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 39 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 120 | |
| 2.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 15 |
| Density, g/cm3 | 2.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.3 | |
| 3.0 |
| Embodied Energy, MJ/kg | 150 | |
| 42 |
| Embodied Water, L/kg | 1150 | |
| 140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 23 to 46 | |
| 240 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 110 to 690 | |
| 140 to 440 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 47 | |
| 25 |
| Strength to Weight: Axial, points | 18 to 37 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 25 to 41 | |
| 20 to 22 |
| Thermal Diffusivity, mm2/s | 59 | |
| 4.4 |
| Thermal Shock Resistance, points | 8.3 to 17 | |
| 13 to 15 |
Alloy Composition
| Aluminum (Al), % | 91.2 to 94.8 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0.1 to 0.35 | |
| 17 to 19 |
| Copper (Cu), % | 0 to 0.2 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 67.3 to 74.9 |
| Magnesium (Mg), % | 1.0 to 1.4 | |
| 0 |
| Manganese (Mn), % | 0.050 to 0.5 | |
| 0 to 2.0 |
| Nickel (Ni), % | 0 | |
| 8.0 to 10 |
| Phosphorus (P), % | 0 | |
| 0 to 0.2 |
| Silicon (Si), % | 0 to 0.35 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0.15 to 0.35 |
| Titanium (Ti), % | 0 to 0.25 | |
| 0 |
| Zinc (Zn), % | 4.0 to 5.0 | |
| 0 |
| Zirconium (Zr), % | 0.080 to 0.25 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |