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7116 Aluminum vs. S31727 Stainless Steel

7116 aluminum belongs to the aluminum alloys classification, while S31727 stainless steel belongs to the iron 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 7116 aluminum and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 7.8
40
Fatigue Strength, MPa 160
240
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
78
Shear Strength, MPa 220
430
Tensile Strength: Ultimate (UTS), MPa 370
630
Tensile Strength: Yield (Proof), MPa 330
270

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 170
1010
Melting Completion (Liquidus), °C 640
1440
Melting Onset (Solidus), °C 520
1390
Specific Heat Capacity, J/kg-K 880
470
Thermal Expansion, µm/m-K 24
16

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
24
Density, g/cm3 2.9
8.0
Embodied Carbon, kg CO2/kg material 8.2
4.7
Embodied Energy, MJ/kg 150
64
Embodied Water, L/kg 1150
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 28
200
Resilience: Unit (Modulus of Resilience), kJ/m3 790
190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 35
22
Strength to Weight: Bending, points 39
20
Thermal Shock Resistance, points 16
14

Alloy Composition

Aluminum (Al), % 91.5 to 94.5
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
17.5 to 19
Copper (Cu), % 0.5 to 1.1
2.8 to 4.0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
53.7 to 61.3
Magnesium (Mg), % 0.8 to 1.4
0
Manganese (Mn), % 0 to 0.050
0 to 1.0
Molybdenum (Mo), % 0
3.8 to 4.5
Nickel (Ni), % 0
14.5 to 16.5
Nitrogen (N), % 0
0.15 to 0.21
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.15
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 4.2 to 5.2
0
Residuals, % 0 to 0.15
0