SAE-AISI 4320 Steel vs. 7005 Aluminum
SAE-AISI 4320 steel belongs to the iron alloys classification, while 7005 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 SAE-AISI 4320 steel and the bottom bar is 7005 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 70 |
| Elongation at Break, % | 21 to 29 | |
| 10 to 20 |
| Fatigue Strength, MPa | 320 | |
| 100 to 190 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 73 | |
| 26 |
| Shear Strength, MPa | 370 to 500 | |
| 120 to 230 |
| Tensile Strength: Ultimate (UTS), MPa | 570 to 790 | |
| 200 to 400 |
| Tensile Strength: Yield (Proof), MPa | 430 to 460 | |
| 95 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 380 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 200 |
| Melting Completion (Liquidus), °C | 1460 | |
| 640 |
| Melting Onset (Solidus), °C | 1420 | |
| 610 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 880 |
| Thermal Conductivity, W/m-K | 46 | |
| 140 to 170 |
| Thermal Expansion, µm/m-K | 11 | |
| 23 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 35 to 43 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.5 | |
| 110 to 130 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.4 | |
| 9.5 |
| Density, g/cm3 | 7.9 | |
| 2.9 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 8.3 |
| Embodied Energy, MJ/kg | 22 | |
| 150 |
| Embodied Water, L/kg | 52 | |
| 1150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 150 | |
| 32 to 57 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 480 to 560 | |
| 65 to 850 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 47 |
| Strength to Weight: Axial, points | 20 to 28 | |
| 19 to 38 |
| Strength to Weight: Bending, points | 19 to 24 | |
| 26 to 41 |
| Thermal Diffusivity, mm2/s | 13 | |
| 54 to 65 |
| Thermal Shock Resistance, points | 19 to 27 | |
| 8.7 to 18 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 91 to 94.7 |
| Carbon (C), % | 0.17 to 0.22 | |
| 0 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0.060 to 0.2 |
| Copper (Cu), % | 0 | |
| 0 to 0.1 |
| Iron (Fe), % | 95.8 to 97 | |
| 0 to 0.4 |
| Magnesium (Mg), % | 0 | |
| 1.0 to 1.8 |
| Manganese (Mn), % | 0.45 to 0.65 | |
| 0.2 to 0.7 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.35 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 0.010 to 0.060 |
| Zinc (Zn), % | 0 | |
| 4.0 to 5.0 |
| Zirconium (Zr), % | 0 | |
| 0.080 to 0.2 |
| Residuals, % | 0 | |
| 0 to 0.15 |