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8021 Aluminum vs. S35500 Stainless Steel

8021 aluminum belongs to the aluminum alloys classification, while S35500 stainless steel belongs to the iron alloys. There are 29 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 8021 aluminum and the bottom bar is S35500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 2.3
14
Fatigue Strength, MPa 61
690 to 730
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
78
Tensile Strength: Ultimate (UTS), MPa 160
1330 to 1490
Tensile Strength: Yield (Proof), MPa 130
1200 to 1280

Thermal Properties

Latent Heat of Fusion, J/g 400
280
Maximum Temperature: Mechanical, °C 170
870
Melting Completion (Liquidus), °C 650
1460
Melting Onset (Solidus), °C 640
1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 220
16
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 180
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
16
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 8.1
3.5
Embodied Energy, MJ/kg 150
47
Embodied Water, L/kg 1180
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.4
180 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 130
3610 to 4100
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 49
25
Strength to Weight: Axial, points 16
47 to 53
Strength to Weight: Bending, points 23
34 to 37
Thermal Diffusivity, mm2/s 88
4.4
Thermal Shock Resistance, points 7.0
44 to 49

Alloy Composition

Aluminum (Al), % 98 to 98.8
0
Carbon (C), % 0
0.1 to 0.15
Chromium (Cr), % 0
15 to 16
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 1.2 to 1.7
73.2 to 77.7
Manganese (Mn), % 0
0.5 to 1.3
Molybdenum (Mo), % 0
2.5 to 3.2
Nickel (Ni), % 0
4.0 to 5.0
Niobium (Nb), % 0
0.1 to 0.5
Nitrogen (N), % 0
0.070 to 0.13
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.15
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Residuals, % 0 to 0.15
0