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5021 Aluminum vs. S33550 Stainless Steel

5021 aluminum belongs to the aluminum alloys classification, while S33550 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 S33550 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
200
Elongation at Break, % 1.1 to 3.4
40
Fatigue Strength, MPa 85 to 110
270
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 26
79
Shear Strength, MPa 170
470
Tensile Strength: Ultimate (UTS), MPa 300 to 310
680
Tensile Strength: Yield (Proof), MPa 240 to 270
310

Thermal Properties

Latent Heat of Fusion, J/g 400
300
Maximum Temperature: Mechanical, °C 180
1100
Melting Completion (Liquidus), °C 640
1400
Melting Onset (Solidus), °C 590
1360
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 140
15
Thermal Expansion, µm/m-K 23
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
24
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.6
4.3
Embodied Energy, MJ/kg 150
61
Embodied Water, L/kg 1180
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.1 to 10
220
Resilience: Unit (Modulus of Resilience), kJ/m3 440 to 550
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 30 to 32
24
Strength to Weight: Bending, points 37
22
Thermal Diffusivity, mm2/s 57
3.9
Thermal Shock Resistance, points 13 to 14
15

Alloy Composition

Aluminum (Al), % 95.2 to 97.7
0
Carbon (C), % 0
0.040 to 0.1
Cerium (Ce), % 0
0.025 to 0.070
Chromium (Cr), % 0 to 0.15
25 to 28
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 0.5
48.8 to 58.2
Lanthanum (La), % 0
0.025 to 0.070
Magnesium (Mg), % 2.2 to 2.8
0
Manganese (Mn), % 0.1 to 0.5
0 to 1.5
Nickel (Ni), % 0
16.5 to 20
Niobium (Nb), % 0
0.050 to 0.15
Nitrogen (N), % 0
0.18 to 0.25
Phosphorus (P), % 0
0 to 0.040
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