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S21904 Stainless Steel vs. 7475 Aluminum

S21904 stainless steel belongs to the iron alloys classification, while 7475 aluminum belongs to the aluminum alloys. There are 30 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 S21904 stainless steel and the bottom bar is 7475 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 17 to 51
10 to 12
Fatigue Strength, MPa 380 to 550
190 to 210
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 78
26
Shear Strength, MPa 510 to 620
320 to 350
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
530 to 590
Tensile Strength: Yield (Proof), MPa 390 to 910
440 to 520

Thermal Properties

Latent Heat of Fusion, J/g 290
380
Maximum Temperature: Mechanical, °C 980
180
Melting Completion (Liquidus), °C 1400
640
Melting Onset (Solidus), °C 1350
480
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 14
140 to 160
Thermal Expansion, µm/m-K 17
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
33 to 42
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
98 to 120

Otherwise Unclassified Properties

Base Metal Price, % relative 15
10
Density, g/cm3 7.7
3.0
Embodied Carbon, kg CO2/kg material 3.0
8.2
Embodied Energy, MJ/kg 43
150
Embodied Water, L/kg 160
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
53 to 68
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
1390 to 1920
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 25 to 36
49 to 55
Strength to Weight: Bending, points 23 to 29
48 to 52
Thermal Diffusivity, mm2/s 3.8
53 to 63
Thermal Shock Resistance, points 15 to 21
23 to 26

Alloy Composition

Aluminum (Al), % 0
88.6 to 91.6
Carbon (C), % 0 to 0.040
0
Chromium (Cr), % 19 to 21.5
0.18 to 0.25
Copper (Cu), % 0
1.2 to 1.9
Iron (Fe), % 59.5 to 67.4
0 to 0.12
Magnesium (Mg), % 0
1.9 to 2.6
Manganese (Mn), % 8.0 to 10
0 to 0.060
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 0.1
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.060
Zinc (Zn), % 0
5.1 to 6.2
Residuals, % 0
0 to 0.15