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5021 Aluminum vs. S44625 Stainless Steel

5021 aluminum belongs to the aluminum alloys classification, while S44625 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 S44625 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 68
200
Elongation at Break, % 1.1 to 3.4
22
Fatigue Strength, MPa 85 to 110
240
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 26
80
Shear Strength, MPa 170
370
Tensile Strength: Ultimate (UTS), MPa 300 to 310
590
Tensile Strength: Yield (Proof), MPa 240 to 270
360

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 180
1100
Melting Completion (Liquidus), °C 640
1440
Melting Onset (Solidus), °C 590
1400
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 140
17
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
14
Density, g/cm3 2.7
7.7
Embodied Carbon, kg CO2/kg material 8.6
2.8
Embodied Energy, MJ/kg 150
39
Embodied Water, L/kg 1180
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.1 to 10
110
Resilience: Unit (Modulus of Resilience), kJ/m3 440 to 550
310
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 30 to 32
21
Strength to Weight: Bending, points 37
20
Thermal Diffusivity, mm2/s 57
4.6
Thermal Shock Resistance, points 13 to 14
19

Alloy Composition

Aluminum (Al), % 95.2 to 97.7
0
Carbon (C), % 0
0 to 0.010
Chromium (Cr), % 0 to 0.15
25 to 27.5
Copper (Cu), % 0 to 0.15
0 to 0.2
Iron (Fe), % 0 to 0.5
69.4 to 74.3
Magnesium (Mg), % 2.2 to 2.8
0
Manganese (Mn), % 0.1 to 0.5
0 to 0.4
Molybdenum (Mo), % 0
0.75 to 1.5
Nickel (Ni), % 0
0 to 0.5
Nitrogen (N), % 0
0 to 0.015
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.4
0 to 0.4
Sulfur (S), % 0
0 to 0.020
Zinc (Zn), % 0 to 0.15
0
Residuals, % 0 to 0.15
0