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7075 Aluminum vs. S44800 Stainless Steel

7075 aluminum belongs to the aluminum alloys classification, while S44800 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, 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 S44800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
210
Elongation at Break, % 1.8 to 12
23
Fatigue Strength, MPa 110 to 190
300
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 26
82
Shear Strength, MPa 150 to 340
370
Tensile Strength: Ultimate (UTS), MPa 240 to 590
590
Tensile Strength: Yield (Proof), MPa 120 to 510
450

Thermal Properties

Latent Heat of Fusion, J/g 380
300
Maximum Temperature: Mechanical, °C 200
1100
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 480
1410
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 130
17
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 98
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 10
19
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.3
3.8
Embodied Energy, MJ/kg 150
52
Embodied Water, L/kg 1120
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8 to 44
120
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 1870
480
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 22 to 54
21
Strength to Weight: Bending, points 28 to 52
20
Thermal Diffusivity, mm2/s 50
4.6
Thermal Shock Resistance, points 10 to 25
19

Alloy Composition

Aluminum (Al), % 86.9 to 91.4
0
Carbon (C), % 0
0 to 0.010
Chromium (Cr), % 0.18 to 0.28
28 to 30
Copper (Cu), % 1.2 to 2.0
0 to 0.15
Iron (Fe), % 0 to 0.5
62.6 to 66.5
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.3
0 to 0.3
Molybdenum (Mo), % 0
3.5 to 4.2
Nickel (Ni), % 0
2.0 to 2.5
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.4
0 to 0.2
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 5.1 to 6.1
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0