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5021 Aluminum vs. S30435 Stainless Steel

5021 aluminum belongs to the aluminum alloys classification, while S30435 stainless steel belongs to the iron alloys. There are 30 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 5021 aluminum and the bottom bar is S30435 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
190
Elongation at Break, % 1.1 to 3.4
51
Fatigue Strength, MPa 85 to 110
170
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
76
Shear Strength, MPa 170
370
Tensile Strength: Ultimate (UTS), MPa 300 to 310
510
Tensile Strength: Yield (Proof), MPa 240 to 270
170

Thermal Properties

Latent Heat of Fusion, J/g 400
280
Maximum Temperature: Mechanical, °C 180
900
Melting Completion (Liquidus), °C 640
1420
Melting Onset (Solidus), °C 590
1380
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 140
16
Thermal Expansion, µm/m-K 23
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
14
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.6
2.9
Embodied Energy, MJ/kg 150
40
Embodied Water, L/kg 1180
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.1 to 10
210
Resilience: Unit (Modulus of Resilience), kJ/m3 440 to 550
77
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 30 to 32
18
Strength to Weight: Bending, points 37
18
Thermal Diffusivity, mm2/s 57
4.2
Thermal Shock Resistance, points 13 to 14
12

Alloy Composition

Aluminum (Al), % 95.2 to 97.7
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.15
16 to 18
Copper (Cu), % 0 to 0.15
1.5 to 3.0
Iron (Fe), % 0 to 0.5
66.9 to 75.5
Magnesium (Mg), % 2.2 to 2.8
0
Manganese (Mn), % 0.1 to 0.5
0 to 2.0
Nickel (Ni), % 0
7.0 to 9.0
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.15
0
Residuals, % 0 to 0.15
0