7178 Aluminum vs. EN 1.4401 Stainless Steel
7178 aluminum belongs to the aluminum alloys classification, while EN 1.4401 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 7178 aluminum and the bottom bar is EN 1.4401 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 71 | |
| 200 |
| Elongation at Break, % | 4.5 to 12 | |
| 14 to 40 |
| Fatigue Strength, MPa | 120 to 210 | |
| 200 to 320 |
| Poisson's Ratio | 0.32 | |
| 0.28 |
| Shear Modulus, GPa | 27 | |
| 78 |
| Shear Strength, MPa | 140 to 380 | |
| 410 to 550 |
| Tensile Strength: Ultimate (UTS), MPa | 240 to 640 | |
| 600 to 900 |
| Tensile Strength: Yield (Proof), MPa | 120 to 560 | |
| 230 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 370 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 180 | |
| 950 |
| Melting Completion (Liquidus), °C | 630 | |
| 1440 |
| Melting Onset (Solidus), °C | 480 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 860 | |
| 470 |
| Thermal Conductivity, W/m-K | 130 | |
| 15 |
| Thermal Expansion, µm/m-K | 23 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 31 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 91 | |
| 2.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 10 | |
| 19 |
| Density, g/cm3 | 3.1 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 3.8 |
| Embodied Energy, MJ/kg | 150 | |
| 52 |
| Embodied Water, L/kg | 1110 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 24 to 52 | |
| 110 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 110 to 2220 | |
| 130 to 800 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 45 | |
| 25 |
| Strength to Weight: Axial, points | 21 to 58 | |
| 21 to 32 |
| Strength to Weight: Bending, points | 28 to 54 | |
| 20 to 26 |
| Thermal Diffusivity, mm2/s | 47 | |
| 4.0 |
| Thermal Shock Resistance, points | 10 to 28 | |
| 13 to 20 |
Alloy Composition
| Aluminum (Al), % | 85.4 to 89.5 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.070 |
| Chromium (Cr), % | 0.18 to 0.28 | |
| 16.5 to 18.5 |
| Copper (Cu), % | 1.6 to 2.4 | |
| 0 |
| Iron (Fe), % | 0 to 0.5 | |
| 62.8 to 71.5 |
| Magnesium (Mg), % | 2.4 to 3.1 | |
| 0 |
| Manganese (Mn), % | 0 to 0.3 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 2.0 to 2.5 |
| Nickel (Ni), % | 0 | |
| 10 to 13 |
| Nitrogen (N), % | 0 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Titanium (Ti), % | 0 to 0.2 | |
| 0 |
| Zinc (Zn), % | 6.3 to 7.3 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |