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7020 Aluminum vs. S32803 Stainless Steel

7020 aluminum belongs to the aluminum alloys classification, while S32803 stainless steel belongs to the iron alloys. There are 31 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 7020 aluminum and the bottom bar is S32803 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 45 to 100
210
Elastic (Young's, Tensile) Modulus, GPa 70
210
Elongation at Break, % 8.4 to 14
18
Fatigue Strength, MPa 110 to 130
350
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 26
81
Shear Strength, MPa 110 to 230
420
Tensile Strength: Ultimate (UTS), MPa 190 to 390
680
Tensile Strength: Yield (Proof), MPa 120 to 310
560

Thermal Properties

Latent Heat of Fusion, J/g 380
300
Maximum Temperature: Mechanical, °C 210
1100
Melting Completion (Liquidus), °C 650
1450
Melting Onset (Solidus), °C 610
1400
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
19
Density, g/cm3 2.9
7.7
Embodied Carbon, kg CO2/kg material 8.3
3.7
Embodied Energy, MJ/kg 150
53
Embodied Water, L/kg 1150
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 46
120
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 690
760
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 18 to 37
25
Strength to Weight: Bending, points 25 to 41
22
Thermal Diffusivity, mm2/s 59
4.4
Thermal Shock Resistance, points 8.3 to 17
22

Alloy Composition

Aluminum (Al), % 91.2 to 94.8
0
Carbon (C), % 0
0 to 0.015
Chromium (Cr), % 0.1 to 0.35
28 to 29
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 0 to 0.4
62.9 to 67.1
Magnesium (Mg), % 1.0 to 1.4
0
Manganese (Mn), % 0.050 to 0.5
0 to 0.5
Molybdenum (Mo), % 0
1.8 to 2.5
Nickel (Ni), % 0
3.0 to 4.0
Niobium (Nb), % 0
0.15 to 0.5
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.35
0 to 0.55
Sulfur (S), % 0
0 to 0.0035
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 4.0 to 5.0
0
Zirconium (Zr), % 0.080 to 0.25
0
Residuals, % 0 to 0.15
0