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SAE-AISI S6 Steel vs. 7050 Aluminum

SAE-AISI S6 steel belongs to the iron alloys classification, while 7050 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 7050 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 72
26
Tensile Strength: Ultimate (UTS), MPa 670 to 1920
490 to 570

Thermal Properties

Latent Heat of Fusion, J/g 290
370
Melting Completion (Liquidus), °C 1430
630
Melting Onset (Solidus), °C 1390
490
Specific Heat Capacity, J/kg-K 480
860
Thermal Conductivity, W/m-K 41
140
Thermal Expansion, µm/m-K 12
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
35
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
100

Otherwise Unclassified Properties

Base Metal Price, % relative 3.2
10
Density, g/cm3 7.7
3.1
Embodied Carbon, kg CO2/kg material 2.3
8.2
Embodied Energy, MJ/kg 33
150
Embodied Water, L/kg 56
1120

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
45
Strength to Weight: Axial, points 24 to 70
45 to 51
Strength to Weight: Bending, points 22 to 45
45 to 50
Thermal Diffusivity, mm2/s 11
54
Thermal Shock Resistance, points 22 to 64
21 to 25

Alloy Composition

Aluminum (Al), % 0
87.3 to 92.1
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
2.0 to 2.6
Iron (Fe), % 92.8 to 94.7
0 to 0.15
Magnesium (Mg), % 0
1.9 to 2.6
Manganese (Mn), % 1.2 to 1.5
0 to 0.1
Molybdenum (Mo), % 0.3 to 0.5
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 2.0 to 2.5
0 to 0.12
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.060
Vanadium (V), % 0.2 to 0.4
0
Zinc (Zn), % 0
5.7 to 6.7
Zirconium (Zr), % 0
0.080 to 0.15
Residuals, % 0
0 to 0.15