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7075 Aluminum vs. S45500 Stainless Steel

7075 aluminum belongs to the aluminum alloys classification, while S45500 stainless steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (11, 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 7075 aluminum and the bottom bar is S45500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 1.8 to 12
3.4 to 11
Fatigue Strength, MPa 110 to 190
570 to 890
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 26
75
Shear Strength, MPa 150 to 340
790 to 1090
Tensile Strength: Ultimate (UTS), MPa 240 to 590
1370 to 1850
Tensile Strength: Yield (Proof), MPa 120 to 510
1240 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 380
270
Maximum Temperature: Mechanical, °C 200
760
Melting Completion (Liquidus), °C 640
1440
Melting Onset (Solidus), °C 480
1400
Specific Heat Capacity, J/kg-K 870
470
Thermal Expansion, µm/m-K 23
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
17
Density, g/cm3 3.0
7.9
Embodied Carbon, kg CO2/kg material 8.3
3.8
Embodied Energy, MJ/kg 150
57
Embodied Water, L/kg 1120
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8 to 44
45 to 190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 22 to 54
48 to 65
Strength to Weight: Bending, points 28 to 52
35 to 42
Thermal Shock Resistance, points 10 to 25
48 to 64

Alloy Composition

Aluminum (Al), % 86.9 to 91.4
0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0.18 to 0.28
11 to 12.5
Copper (Cu), % 1.2 to 2.0
1.5 to 2.5
Iron (Fe), % 0 to 0.5
71.5 to 79.2
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.3
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
7.5 to 9.5
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0 to 0.2
0.8 to 1.4
Zinc (Zn), % 5.1 to 6.1
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0

Comparable Variants