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S21900 Stainless Steel vs. 5050 Aluminum

S21900 stainless steel belongs to the iron alloys classification, while 5050 aluminum belongs to the aluminum alloys. There are 31 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 S21900 stainless steel and the bottom bar is 5050 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220
36 to 68
Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 50
1.7 to 22
Fatigue Strength, MPa 380
45 to 100
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 510
91 to 140
Tensile Strength: Ultimate (UTS), MPa 710
140 to 250
Tensile Strength: Yield (Proof), MPa 390
50 to 210

Thermal Properties

Latent Heat of Fusion, J/g 290
400
Maximum Temperature: Mechanical, °C 980
180
Melting Completion (Liquidus), °C 1400
650
Melting Onset (Solidus), °C 1350
630
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 14
190
Thermal Expansion, µm/m-K 17
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
50
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
8.4
Embodied Energy, MJ/kg 43
150
Embodied Water, L/kg 160
1190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
4.1 to 24
Resilience: Unit (Modulus of Resilience), kJ/m3 380
18 to 330
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 26
15 to 26
Strength to Weight: Bending, points 23
22 to 33
Thermal Diffusivity, mm2/s 3.8
79
Thermal Shock Resistance, points 15
6.3 to 11

Alloy Composition

Aluminum (Al), % 0
96.3 to 98.9
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 19 to 21.5
0 to 0.1
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 59.4 to 67.4
0 to 0.7
Magnesium (Mg), % 0
1.1 to 1.8
Manganese (Mn), % 8.0 to 10
0 to 0.1
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 0.4
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15