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5021 Aluminum vs. S40930 Stainless Steel

5021 aluminum belongs to the aluminum alloys classification, while S40930 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 S40930 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
190
Elongation at Break, % 1.1 to 3.4
23
Fatigue Strength, MPa 85 to 110
130
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
75
Shear Strength, MPa 170
270
Tensile Strength: Ultimate (UTS), MPa 300 to 310
430
Tensile Strength: Yield (Proof), MPa 240 to 270
190

Thermal Properties

Latent Heat of Fusion, J/g 400
270
Maximum Temperature: Mechanical, °C 180
710
Melting Completion (Liquidus), °C 640
1450
Melting Onset (Solidus), °C 590
1410
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 140
25
Thermal Expansion, µm/m-K 23
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 120
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
8.5
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.6
2.3
Embodied Energy, MJ/kg 150
32
Embodied Water, L/kg 1180
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.1 to 10
80
Resilience: Unit (Modulus of Resilience), kJ/m3 440 to 550
94
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 30 to 32
16
Strength to Weight: Bending, points 37
16
Thermal Diffusivity, mm2/s 57
6.7
Thermal Shock Resistance, points 13 to 14
16

Alloy Composition

Aluminum (Al), % 95.2 to 97.7
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.15
10.5 to 11.7
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 0.5
84.7 to 89.4
Magnesium (Mg), % 2.2 to 2.8
0
Manganese (Mn), % 0.1 to 0.5
0 to 1.0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0.080 to 0.75
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0
0.050 to 0.2
Zinc (Zn), % 0 to 0.15
0
Residuals, % 0 to 0.15
0