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324.0 Aluminum vs. S21900 Stainless Steel

324.0 aluminum belongs to the aluminum alloys classification, while S21900 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 324.0 aluminum and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 3.0 to 4.0
50
Fatigue Strength, MPa 77 to 89
380
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
78
Tensile Strength: Ultimate (UTS), MPa 210 to 310
710
Tensile Strength: Yield (Proof), MPa 110 to 270
390

Thermal Properties

Latent Heat of Fusion, J/g 500
290
Maximum Temperature: Mechanical, °C 170
980
Melting Completion (Liquidus), °C 610
1400
Melting Onset (Solidus), °C 550
1350
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 150
14
Thermal Expansion, µm/m-K 21
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Density, g/cm3 2.7
7.7
Embodied Carbon, kg CO2/kg material 7.9
3.0
Embodied Energy, MJ/kg 150
43
Embodied Water, L/kg 1090
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.8 to 8.9
300
Resilience: Unit (Modulus of Resilience), kJ/m3 85 to 510
380
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 52
25
Strength to Weight: Axial, points 22 to 32
26
Strength to Weight: Bending, points 29 to 38
23
Thermal Diffusivity, mm2/s 62
3.8
Thermal Shock Resistance, points 9.7 to 14
15

Alloy Composition

Aluminum (Al), % 87.3 to 92.2
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
19 to 21.5
Copper (Cu), % 0.4 to 0.6
0
Iron (Fe), % 0 to 1.2
59.4 to 67.4
Magnesium (Mg), % 0.4 to 0.7
0
Manganese (Mn), % 0 to 0.5
8.0 to 10
Nickel (Ni), % 0 to 0.3
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 7.0 to 8.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 1.0
0
Residuals, % 0 to 0.2
0