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S31727 Stainless Steel vs. 7108A Aluminum

S31727 stainless steel belongs to the iron alloys classification, while 7108A aluminum belongs to the aluminum alloys. There are 26 material properties with values for both materials. Properties with values for just one material (9, 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 S31727 stainless steel and the bottom bar is 7108A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 40
11 to 13
Fatigue Strength, MPa 240
120 to 130
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 430
210
Tensile Strength: Ultimate (UTS), MPa 630
350
Tensile Strength: Yield (Proof), MPa 270
290 to 300

Thermal Properties

Latent Heat of Fusion, J/g 290
380
Maximum Temperature: Mechanical, °C 1010
210
Melting Completion (Liquidus), °C 1440
630
Melting Onset (Solidus), °C 1390
520
Specific Heat Capacity, J/kg-K 470
870
Thermal Expansion, µm/m-K 16
24

Otherwise Unclassified Properties

Base Metal Price, % relative 24
10
Density, g/cm3 8.0
2.9
Embodied Carbon, kg CO2/kg material 4.7
8.3
Embodied Energy, MJ/kg 64
150
Embodied Water, L/kg 180
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
38 to 44
Resilience: Unit (Modulus of Resilience), kJ/m3 190
610 to 640
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 22
33 to 34
Strength to Weight: Bending, points 20
38
Thermal Shock Resistance, points 14
15 to 16

Alloy Composition

Aluminum (Al), % 0
91.6 to 94.4
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 19
0 to 0.040
Copper (Cu), % 2.8 to 4.0
0 to 0.050
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 53.7 to 61.3
0 to 0.3
Magnesium (Mg), % 0
0.7 to 1.5
Manganese (Mn), % 0 to 1.0
0 to 0.050
Molybdenum (Mo), % 3.8 to 4.5
0
Nickel (Ni), % 14.5 to 16.5
0
Nitrogen (N), % 0.15 to 0.21
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
0 to 0.2
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.030
Zinc (Zn), % 0
4.8 to 5.8
Zirconium (Zr), % 0
0.15 to 0.25
Residuals, % 0
0 to 0.15