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S21900 Stainless Steel vs. 5019 Aluminum

S21900 stainless steel belongs to the iron alloys classification, while 5019 aluminum belongs to the aluminum 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 S21900 stainless steel and the bottom bar is 5019 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 50
2.2 to 18
Fatigue Strength, MPa 380
100 to 160
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 510
170 to 210
Tensile Strength: Ultimate (UTS), MPa 710
280 to 360
Tensile Strength: Yield (Proof), MPa 390
120 to 300

Thermal Properties

Latent Heat of Fusion, J/g 290
400
Maximum Temperature: Mechanical, °C 980
180
Melting Completion (Liquidus), °C 1400
640
Melting Onset (Solidus), °C 1350
540
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 14
130
Thermal Expansion, µm/m-K 17
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
29
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
98

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
9.0
Embodied Energy, MJ/kg 43
150
Embodied Water, L/kg 160
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 300
7.6 to 40
Resilience: Unit (Modulus of Resilience), kJ/m3 380
110 to 650
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
51
Strength to Weight: Axial, points 26
29 to 38
Strength to Weight: Bending, points 23
35 to 42
Thermal Diffusivity, mm2/s 3.8
52
Thermal Shock Resistance, points 15
13 to 16

Alloy Composition

Aluminum (Al), % 0
91.5 to 95.3
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 19 to 21.5
0 to 0.2
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 59.4 to 67.4
0 to 0.5
Magnesium (Mg), % 0
4.5 to 5.6
Manganese (Mn), % 8.0 to 10
0.1 to 0.6
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
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15