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2218 Aluminum vs. SAE-AISI S7 Steel

2218 aluminum belongs to the aluminum alloys classification, while SAE-AISI S7 steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (9, 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 SAE-AISI S7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
190
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
74
Tensile Strength: Ultimate (UTS), MPa 330 to 430
670 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 390
260
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 510
1420
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 140
40
Thermal Expansion, µm/m-K 22
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 110
9.0

Otherwise Unclassified Properties

Base Metal Price, % relative 11
5.0
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.2
2.3
Embodied Energy, MJ/kg 150
31
Embodied Water, L/kg 1130
65

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 30 to 39
24 to 72
Strength to Weight: Bending, points 34 to 41
22 to 46
Thermal Diffusivity, mm2/s 52
11
Thermal Shock Resistance, points 15 to 19
22 to 66

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0
Carbon (C), % 0
0.45 to 0.55
Chromium (Cr), % 0 to 0.1
3.0 to 3.5
Copper (Cu), % 3.5 to 4.5
0 to 0.25
Iron (Fe), % 0 to 1.0
91.6 to 94.9
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.2
0.2 to 0.9
Molybdenum (Mo), % 0
1.3 to 1.8
Nickel (Ni), % 1.7 to 2.3
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.9
0.2 to 1.0
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0 to 0.3
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0