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S21603 Stainless Steel vs. 5021 Aluminum

S21603 stainless steel belongs to the iron alloys classification, while 5021 aluminum belongs to the aluminum alloys. There are 26 material properties with values for both materials. Properties with values for just one material (9, 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 S21603 stainless steel and the bottom bar is 5021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 45
1.1 to 3.4
Fatigue Strength, MPa 360
85 to 110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 79
26
Shear Strength, MPa 490
170
Tensile Strength: Ultimate (UTS), MPa 690
300 to 310
Tensile Strength: Yield (Proof), MPa 390
240 to 270

Thermal Properties

Latent Heat of Fusion, J/g 290
400
Maximum Temperature: Mechanical, °C 990
180
Melting Completion (Liquidus), °C 1420
640
Melting Onset (Solidus), °C 1380
590
Specific Heat Capacity, J/kg-K 480
900
Thermal Expansion, µm/m-K 17
23

Otherwise Unclassified Properties

Base Metal Price, % relative 17
9.5
Density, g/cm3 7.7
2.7
Embodied Carbon, kg CO2/kg material 3.6
8.6
Embodied Energy, MJ/kg 50
150
Embodied Water, L/kg 160
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 270
3.1 to 10
Resilience: Unit (Modulus of Resilience), kJ/m3 380
440 to 550
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 25
30 to 32
Strength to Weight: Bending, points 22
37
Thermal Shock Resistance, points 15
13 to 14

Alloy Composition

Aluminum (Al), % 0
95.2 to 97.7
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 22
0 to 0.15
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 57.6 to 67.8
0 to 0.5
Magnesium (Mg), % 0
2.2 to 2.8
Manganese (Mn), % 7.5 to 9.0
0.1 to 0.5
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 5.0 to 7.0
0
Nitrogen (N), % 0.25 to 0.5
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0 to 0.4
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.15
Residuals, % 0
0 to 0.15