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7108 Aluminum vs. S35500 Stainless Steel

7108 aluminum belongs to the aluminum alloys classification, while S35500 stainless steel belongs to the iron alloys. There are 30 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 7108 aluminum and the bottom bar is S35500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 11
14
Fatigue Strength, MPa 120
690 to 730
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
78
Shear Strength, MPa 210
810 to 910
Tensile Strength: Ultimate (UTS), MPa 350
1330 to 1490
Tensile Strength: Yield (Proof), MPa 290
1200 to 1280

Thermal Properties

Latent Heat of Fusion, J/g 380
280
Maximum Temperature: Mechanical, °C 210
870
Melting Completion (Liquidus), °C 630
1460
Melting Onset (Solidus), °C 530
1420
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 24
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
16
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.3
3.5
Embodied Energy, MJ/kg 150
47
Embodied Water, L/kg 1150
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 38
180 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 620
3610 to 4100
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 34
47 to 53
Strength to Weight: Bending, points 38
34 to 37
Thermal Diffusivity, mm2/s 59
4.4
Thermal Shock Resistance, points 16
44 to 49

Alloy Composition

Aluminum (Al), % 92.4 to 94.7
0
Carbon (C), % 0
0.1 to 0.15
Chromium (Cr), % 0
15 to 16
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.1
73.2 to 77.7
Magnesium (Mg), % 0.7 to 1.4
0
Manganese (Mn), % 0 to 0.050
0.5 to 1.3
Molybdenum (Mo), % 0
2.5 to 3.2
Nickel (Ni), % 0
4.0 to 5.0
Niobium (Nb), % 0
0.1 to 0.5
Nitrogen (N), % 0
0.070 to 0.13
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.050
0
Zinc (Zn), % 4.5 to 5.5
0
Zirconium (Zr), % 0.12 to 0.25
0
Residuals, % 0 to 0.15
0