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S21900 Stainless Steel vs. 5005A Aluminum

S21900 stainless steel belongs to the iron alloys classification, while 5005A aluminum belongs to the aluminum alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 S21900 stainless steel and the bottom bar is 5005A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
29 to 64
Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 50
1.1 to 21
Fatigue Strength, MPa 380
38 to 82
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 510
71 to 130
Tensile Strength: Ultimate (UTS), MPa 710
110 to 230
Tensile Strength: Yield (Proof), MPa 390
43 to 210

Thermal Properties

Latent Heat of Fusion, J/g 290
400
Maximum Temperature: Mechanical, °C 980
180
Melting Completion (Liquidus), °C 1400
660
Melting Onset (Solidus), °C 1350
630
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 14
200
Thermal Expansion, µm/m-K 17
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
52
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
170

Otherwise Unclassified Properties

Base Metal Price, % relative 15
9.5
Density, g/cm3 7.7
2.7
Embodied Carbon, kg CO2/kg material 3.0
8.3
Embodied Energy, MJ/kg 43
150
Embodied Water, L/kg 160
1190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
2.0 to 19
Resilience: Unit (Modulus of Resilience), kJ/m3 380
14 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 26
12 to 24
Strength to Weight: Bending, points 23
19 to 31
Thermal Diffusivity, mm2/s 3.8
82
Thermal Shock Resistance, points 15
5.0 to 10

Alloy Composition

Aluminum (Al), % 0
97.5 to 99.3
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 19 to 21.5
0 to 0.1
Copper (Cu), % 0
0 to 0.050
Iron (Fe), % 59.4 to 67.4
0 to 0.45
Magnesium (Mg), % 0
0.7 to 1.1
Manganese (Mn), % 8.0 to 10
0 to 0.15
Nickel (Ni), % 5.5 to 7.5
0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0 to 0.3
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15