2218 Aluminum vs. S38815 Stainless Steel
2218 aluminum belongs to the aluminum alloys classification, while S38815 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, 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 2218 aluminum and the bottom bar is S38815 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 95 to 110 | |
| 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 73 | |
| 190 |
| Elongation at Break, % | 6.8 to 10 | |
| 34 |
| Fatigue Strength, MPa | 110 | |
| 230 |
| Poisson's Ratio | 0.33 | |
| 0.29 |
| Shear Modulus, GPa | 27 | |
| 74 |
| Shear Strength, MPa | 210 to 250 | |
| 410 |
| Tensile Strength: Ultimate (UTS), MPa | 330 to 430 | |
| 610 |
| Tensile Strength: Yield (Proof), MPa | 260 to 310 | |
| 290 |
Thermal Properties
| Latent Heat of Fusion, J/g | 390 | |
| 370 |
| Maximum Temperature: Mechanical, °C | 220 | |
| 860 |
| Melting Completion (Liquidus), °C | 640 | |
| 1360 |
| Melting Onset (Solidus), °C | 510 | |
| 1310 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 500 |
| Thermal Expansion, µm/m-K | 22 | |
| 15 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 11 | |
| 19 |
| Density, g/cm3 | 3.1 | |
| 7.5 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 3.8 |
| Embodied Energy, MJ/kg | 150 | |
| 54 |
| Embodied Water, L/kg | 1130 | |
| 140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 27 to 31 | |
| 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 450 to 650 | |
| 220 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 45 | |
| 25 |
| Strength to Weight: Axial, points | 30 to 39 | |
| 22 |
| Strength to Weight: Bending, points | 34 to 41 | |
| 21 |
| Thermal Shock Resistance, points | 15 to 19 | |
| 15 |
Alloy Composition
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| Aluminum (Al), % | 88.8 to 93.6 | |
| 0 to 0.3 |
| Carbon (C), % | 0 | |
| 0 to 0.030 |
| Chromium (Cr), % | 0 to 0.1 | |
| 13 to 15 |
| Copper (Cu), % | 3.5 to 4.5 | |
| 0.75 to 1.5 |
| Iron (Fe), % | 0 to 1.0 | |
| 56.1 to 67 |
| Magnesium (Mg), % | 1.2 to 1.8 | |
| 0 |
| Manganese (Mn), % | 0 to 0.2 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 0.75 to 1.5 |
| Nickel (Ni), % | 1.7 to 2.3 | |
| 13 to 17 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.9 | |
| 5.5 to 6.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.020 |
| Zinc (Zn), % | 0 to 0.25 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |