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7108 Aluminum vs. S44535 Stainless Steel

7108 aluminum belongs to the aluminum alloys classification, while S44535 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 S44535 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 11
28
Fatigue Strength, MPa 120
210
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 26
78
Shear Strength, MPa 210
290
Tensile Strength: Ultimate (UTS), MPa 350
450
Tensile Strength: Yield (Proof), MPa 290
290

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 210
1000
Melting Completion (Liquidus), °C 630
1430
Melting Onset (Solidus), °C 530
1390
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 150
21
Thermal Expansion, µm/m-K 24
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 120
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
11
Density, g/cm3 2.9
7.7
Embodied Carbon, kg CO2/kg material 8.3
2.4
Embodied Energy, MJ/kg 150
34
Embodied Water, L/kg 1150
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 38
110
Resilience: Unit (Modulus of Resilience), kJ/m3 620
200
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 34
16
Strength to Weight: Bending, points 38
17
Thermal Diffusivity, mm2/s 59
5.6
Thermal Shock Resistance, points 16
15

Alloy Composition

Aluminum (Al), % 92.4 to 94.7
0 to 0.5
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
20 to 24
Copper (Cu), % 0 to 0.050
0 to 0.5
Iron (Fe), % 0 to 0.1
73.2 to 79.6
Lanthanum (La), % 0
0.040 to 0.2
Magnesium (Mg), % 0.7 to 1.4
0
Manganese (Mn), % 0 to 0.050
0.3 to 0.8
Phosphorus (P), % 0
0 to 0.050
Silicon (Si), % 0 to 0.1
0 to 0.5
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0 to 0.050
0.030 to 0.2
Zinc (Zn), % 4.5 to 5.5
0
Zirconium (Zr), % 0.12 to 0.25
0
Residuals, % 0 to 0.15
0