2218 Aluminum vs. S17700 Stainless Steel
2218 aluminum belongs to the aluminum alloys classification, while S17700 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 2218 aluminum and the bottom bar is S17700 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 95 to 110 | |
| 180 to 430 |
| Elastic (Young's, Tensile) Modulus, GPa | 73 | |
| 200 |
| Elongation at Break, % | 6.8 to 10 | |
| 1.0 to 23 |
| Fatigue Strength, MPa | 110 | |
| 290 to 560 |
| Poisson's Ratio | 0.33 | |
| 0.28 |
| Shear Modulus, GPa | 27 | |
| 76 |
| Shear Strength, MPa | 210 to 250 | |
| 740 to 940 |
| Tensile Strength: Ultimate (UTS), MPa | 330 to 430 | |
| 1180 to 1650 |
| Tensile Strength: Yield (Proof), MPa | 260 to 310 | |
| 430 to 1210 |
Thermal Properties
| Latent Heat of Fusion, J/g | 390 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 220 | |
| 890 |
| Melting Completion (Liquidus), °C | 640 | |
| 1440 |
| Melting Onset (Solidus), °C | 510 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 480 |
| Thermal Conductivity, W/m-K | 140 | |
| 15 |
| Thermal Expansion, µm/m-K | 22 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 37 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 110 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 11 | |
| 13 |
| Density, g/cm3 | 3.1 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 2.8 |
| Embodied Energy, MJ/kg | 150 | |
| 40 |
| Embodied Water, L/kg | 1130 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 27 to 31 | |
| 15 to 210 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 450 to 650 | |
| 460 to 3750 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 45 | |
| 25 |
| Strength to Weight: Axial, points | 30 to 39 | |
| 42 to 59 |
| Strength to Weight: Bending, points | 34 to 41 | |
| 32 to 40 |
| Thermal Diffusivity, mm2/s | 52 | |
| 4.1 |
| Thermal Shock Resistance, points | 15 to 19 | |
| 39 to 54 |
Alloy Composition
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| Aluminum (Al), % | 88.8 to 93.6 | |
| 0.75 to 1.5 |
| Carbon (C), % | 0 | |
| 0 to 0.090 |
| Chromium (Cr), % | 0 to 0.1 | |
| 16 to 18 |
| Copper (Cu), % | 3.5 to 4.5 | |
| 0 |
| Iron (Fe), % | 0 to 1.0 | |
| 70.5 to 76.8 |
| Magnesium (Mg), % | 1.2 to 1.8 | |
| 0 |
| Manganese (Mn), % | 0 to 0.2 | |
| 0 to 1.0 |
| Nickel (Ni), % | 1.7 to 2.3 | |
| 6.5 to 7.8 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.9 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Zinc (Zn), % | 0 to 0.25 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |