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S32550 Stainless Steel vs. 7022 Aluminum

S32550 stainless steel belongs to the iron alloys classification, while 7022 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 S32550 stainless steel and the bottom bar is 7022 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 21
6.3 to 8.0
Fatigue Strength, MPa 400
140 to 170
Poisson's Ratio 0.27
0.32
Shear Modulus, GPa 80
26
Shear Strength, MPa 540
290 to 320
Tensile Strength: Ultimate (UTS), MPa 860
490 to 540
Tensile Strength: Yield (Proof), MPa 620
390 to 460

Thermal Properties

Latent Heat of Fusion, J/g 300
380
Maximum Temperature: Mechanical, °C 1100
200
Melting Completion (Liquidus), °C 1440
640
Melting Onset (Solidus), °C 1390
480
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 16
140
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
21
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
65

Otherwise Unclassified Properties

Base Metal Price, % relative 20
10
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 3.8
8.5
Embodied Energy, MJ/kg 53
150
Embodied Water, L/kg 180
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
29 to 40
Resilience: Unit (Modulus of Resilience), kJ/m3 940
1100 to 1500
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 31
47 to 51
Strength to Weight: Bending, points 26
47 to 50
Thermal Diffusivity, mm2/s 4.4
54
Thermal Shock Resistance, points 23
21 to 23

Alloy Composition

Aluminum (Al), % 0
87.9 to 92.4
Carbon (C), % 0 to 0.040
0
Chromium (Cr), % 24 to 27
0.1 to 0.3
Copper (Cu), % 1.5 to 2.5
0.5 to 1.0
Iron (Fe), % 57.2 to 67
0 to 0.5
Magnesium (Mg), % 0
2.6 to 3.7
Manganese (Mn), % 0 to 1.5
0.1 to 0.4
Molybdenum (Mo), % 2.9 to 3.9
0
Nickel (Ni), % 4.5 to 6.5
0
Nitrogen (N), % 0.1 to 0.25
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
4.3 to 5.2
Zirconium (Zr), % 0
0 to 0.2
Residuals, % 0
0 to 0.15