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SAE-AISI S7 Steel vs. 5088 Aluminum

SAE-AISI S7 steel belongs to the iron alloys classification, while 5088 aluminum belongs to the aluminum alloys. There are 23 material properties with values for both materials. Properties with values for just one material (8, 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 SAE-AISI S7 steel and the bottom bar is 5088 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
68
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 74
25
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
310

Thermal Properties

Latent Heat of Fusion, J/g 260
390
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1420
540
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 40
120
Thermal Expansion, µm/m-K 12
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
29
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
98

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
9.5
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 2.3
9.0
Embodied Energy, MJ/kg 31
150
Embodied Water, L/kg 65
1180

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 24 to 72
32
Strength to Weight: Bending, points 22 to 46
38
Thermal Diffusivity, mm2/s 11
51
Thermal Shock Resistance, points 22 to 66
14

Alloy Composition

Aluminum (Al), % 0
92.4 to 94.8
Carbon (C), % 0.45 to 0.55
0
Chromium (Cr), % 3.0 to 3.5
0 to 0.15
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 91.6 to 94.9
0.1 to 0.35
Magnesium (Mg), % 0
4.7 to 5.5
Manganese (Mn), % 0.2 to 0.9
0.2 to 0.5
Molybdenum (Mo), % 1.3 to 1.8
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 1.0
0 to 0.2
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0 to 0.3
0
Zinc (Zn), % 0
0.2 to 0.4
Zirconium (Zr), % 0
0 to 0.15
Residuals, % 0
0 to 0.15