7129 Aluminum vs. AISI 316L Stainless Steel
7129 Aluminum belongs to the aluminum alloys classification, while AISI 316L stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 7129 Aluminum and the bottom bar is AISI 316L stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 69 | |
| 200 |
| Elongation at Break, % | 9.0 to 9.1 | |
| 9.0 to 50 |
| Fatigue Strength, MPa | 150 to 190 | |
| 170 to 450 |
| Poisson's Ratio | 0.33 | |
| 0.28 |
| Shear Modulus, GPa | 26 | |
| 78 |
| Shear Strength, MPa | 250 to 260 | |
| 370 to 690 |
| Tensile Strength: Ultimate (UTS), MPa | 430 | |
| 530 to 1160 |
| Tensile Strength: Yield (Proof), MPa | 380 to 390 | |
| 190 to 870 |
Thermal Properties
| Latent Heat of Fusion, J/g | 380 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 180 | |
| 870 |
| Melting Completion (Liquidus), °C | 630 | |
| 1400 |
| Melting Onset (Solidus), °C | 510 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 880 | |
| 470 |
| Thermal Conductivity, W/m-K | 150 | |
| 15 |
| Thermal Expansion, µm/m-K | 24 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 40 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 120 | |
| 2.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 19 |
| Density, g/cm3 | 2.9 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 8.3 | |
| 3.9 |
| Embodied Energy, MJ/kg | 150 | |
| 53 |
| Embodied Water, L/kg | 1150 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 37 to 38 | |
| 77 to 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1050 to 1090 | |
| 93 to 1880 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 47 | |
| 25 |
| Strength to Weight: Axial, points | 41 | |
| 19 to 41 |
| Strength to Weight: Bending, points | 43 to 44 | |
| 18 to 31 |
| Thermal Diffusivity, mm2/s | 58 | |
| 4.1 |
| Thermal Shock Resistance, points | 19 | |
| 12 to 25 |
Alloy Composition
| Aluminum (Al), % | 91 to 94 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.030 |
| Chromium (Cr), % | 0 to 0.1 | |
| 16 to 18 |
| Copper (Cu), % | 0.5 to 0.9 | |
| 0 |
| Gallium (Ga), % | 0 to 0.030 | |
| 0 |
| Iron (Fe), % | 0 to 0.3 | |
| 62 to 72 |
| Magnesium (Mg), % | 1.3 to 2.0 | |
| 0 |
| Manganese (Mn), % | 0 to 0.1 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 2.0 to 3.0 |
| Nickel (Ni), % | 0 | |
| 10 to 14 |
| Nitrogen (N), % | 0 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 0.15 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 to 0.050 | |
| 0 |
| Vanadium (V), % | 0 to 0.050 | |
| 0 |
| Zinc (Zn), % | 4.2 to 5.2 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |