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8090 Aluminum vs. S40975 Stainless Steel

8090 aluminum belongs to the aluminum alloys classification, while S40975 stainless steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, 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 8090 aluminum and the bottom bar is S40975 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 67
190
Elongation at Break, % 3.5 to 13
22
Fatigue Strength, MPa 91 to 140
210
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 25
75
Tensile Strength: Ultimate (UTS), MPa 340 to 490
460
Tensile Strength: Yield (Proof), MPa 210 to 420
310

Thermal Properties

Latent Heat of Fusion, J/g 400
270
Maximum Temperature: Mechanical, °C 190
710
Melting Completion (Liquidus), °C 660
1450
Melting Onset (Solidus), °C 600
1400
Specific Heat Capacity, J/kg-K 960
480
Thermal Conductivity, W/m-K 95 to 160
26
Thermal Expansion, µm/m-K 24
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 20
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 66
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 18
6.5
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.6
2.0
Embodied Energy, MJ/kg 170
28
Embodied Water, L/kg 1160
95

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 16 to 41
93
Resilience: Unit (Modulus of Resilience), kJ/m3 340 to 1330
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 34 to 49
17
Strength to Weight: Bending, points 39 to 50
17
Thermal Diffusivity, mm2/s 36 to 60
7.0
Thermal Shock Resistance, points 15 to 22
17

Alloy Composition


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Aluminum (Al), % 93 to 98.4
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.1
10.5 to 11.7
Copper (Cu), % 1.0 to 1.6
0
Iron (Fe), % 0 to 0.3
84.4 to 89
Lithium (Li), % 2.2 to 2.7
0
Magnesium (Mg), % 0.6 to 1.3
0
Manganese (Mn), % 0 to 0.1
0 to 1.0
Nickel (Ni), % 0
0.5 to 1.0
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.2
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0 to 0.75
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0.040 to 0.16
0
Residuals, % 0 to 0.15
0