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S31277 Stainless Steel vs. 7050 Aluminum

S31277 stainless steel belongs to the iron alloys classification, while 7050 aluminum belongs to the aluminum alloys. There are 26 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 S31277 stainless steel and the bottom bar is 7050 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
70
Elongation at Break, % 45
2.2 to 12
Fatigue Strength, MPa 380
130 to 210
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 80
26
Shear Strength, MPa 600
280 to 330
Tensile Strength: Ultimate (UTS), MPa 860
490 to 570
Tensile Strength: Yield (Proof), MPa 410
390 to 500

Thermal Properties

Latent Heat of Fusion, J/g 310
370
Maximum Temperature: Mechanical, °C 1100
190
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1410
490
Specific Heat Capacity, J/kg-K 460
860
Thermal Expansion, µm/m-K 16
24

Otherwise Unclassified Properties

Base Metal Price, % relative 36
10
Density, g/cm3 8.1
3.1
Embodied Carbon, kg CO2/kg material 6.7
8.2
Embodied Energy, MJ/kg 90
150
Embodied Water, L/kg 220
1120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
10 to 55
Resilience: Unit (Modulus of Resilience), kJ/m3 410
1110 to 1760
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 29
45 to 51
Strength to Weight: Bending, points 25
45 to 50
Thermal Shock Resistance, points 19
21 to 25

Alloy Composition


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Aluminum (Al), % 0
87.3 to 92.1
Carbon (C), % 0 to 0.020
0
Chromium (Cr), % 20.5 to 23
0 to 0.040
Copper (Cu), % 0.5 to 1.5
2.0 to 2.6
Iron (Fe), % 35.5 to 46.2
0 to 0.15
Magnesium (Mg), % 0
1.9 to 2.6
Manganese (Mn), % 0 to 3.0
0 to 0.1
Molybdenum (Mo), % 6.5 to 8.0
0
Nickel (Ni), % 26 to 28
0
Nitrogen (N), % 0.3 to 0.4
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.12
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0
0 to 0.060
Zinc (Zn), % 0
5.7 to 6.7
Zirconium (Zr), % 0
0.080 to 0.15
Residuals, % 0
0 to 0.15