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7076 Aluminum vs. S31727 Stainless Steel

7076 aluminum belongs to the aluminum alloys classification, while S31727 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 7076 aluminum and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
190
Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 6.2
40
Fatigue Strength, MPa 170
240
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
78
Shear Strength, MPa 310
430
Tensile Strength: Ultimate (UTS), MPa 530
630
Tensile Strength: Yield (Proof), MPa 460
270

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 170
1010
Melting Completion (Liquidus), °C 630
1440
Melting Onset (Solidus), °C 460
1390
Specific Heat Capacity, J/kg-K 860
470
Thermal Expansion, µm/m-K 24
16

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
24
Density, g/cm3 3.0
8.0
Embodied Carbon, kg CO2/kg material 8.0
4.7
Embodied Energy, MJ/kg 150
64
Embodied Water, L/kg 1110
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
200
Resilience: Unit (Modulus of Resilience), kJ/m3 1510
190
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 49
22
Strength to Weight: Bending, points 48
20
Thermal Shock Resistance, points 23
14

Alloy Composition

Aluminum (Al), % 86.9 to 91.2
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
17.5 to 19
Copper (Cu), % 0.3 to 1.0
2.8 to 4.0
Iron (Fe), % 0 to 0.6
53.7 to 61.3
Magnesium (Mg), % 1.2 to 2.0
0
Manganese (Mn), % 0.3 to 0.8
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 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 7.0 to 8.0
0
Residuals, % 0 to 0.15
0