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SAE-AISI S6 Steel vs. 7108A Aluminum

SAE-AISI S6 steel belongs to the iron alloys classification, while 7108A 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 S6 steel and the bottom bar is 7108A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
69
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 72
26
Tensile Strength: Ultimate (UTS), MPa 670 to 1920
350

Thermal Properties

Latent Heat of Fusion, J/g 290
380
Melting Completion (Liquidus), °C 1430
630
Melting Onset (Solidus), °C 1390
520
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 41
150
Thermal Expansion, µm/m-K 12
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
36
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
110

Otherwise Unclassified Properties

Base Metal Price, % relative 3.2
10
Density, g/cm3 7.7
2.9
Embodied Carbon, kg CO2/kg material 2.3
8.3
Embodied Energy, MJ/kg 33
150
Embodied Water, L/kg 56
1150

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 24 to 70
33 to 34
Strength to Weight: Bending, points 22 to 45
38
Thermal Diffusivity, mm2/s 11
59
Thermal Shock Resistance, points 22 to 64
15 to 16

Alloy Composition

Aluminum (Al), % 0
91.6 to 94.4
Carbon (C), % 0.4 to 0.5
0
Chromium (Cr), % 1.2 to 1.5
0 to 0.040
Copper (Cu), % 0 to 0.25
0 to 0.050
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 92.8 to 94.7
0 to 0.3
Magnesium (Mg), % 0
0.7 to 1.5
Manganese (Mn), % 1.2 to 1.5
0 to 0.050
Molybdenum (Mo), % 0.3 to 0.5
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 2.0 to 2.5
0 to 0.2
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.030
Vanadium (V), % 0.2 to 0.4
0
Zinc (Zn), % 0
4.8 to 5.8
Zirconium (Zr), % 0
0.15 to 0.25
Residuals, % 0
0 to 0.15