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7175 Aluminum vs. S32001 Stainless Steel

7175 aluminum belongs to the aluminum alloys classification, while S32001 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 7175 aluminum and the bottom bar is S32001 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 3.8 to 5.9
28
Fatigue Strength, MPa 150 to 180
370
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 26
78
Shear Strength, MPa 290 to 330
450
Tensile Strength: Ultimate (UTS), MPa 520 to 570
690
Tensile Strength: Yield (Proof), MPa 430 to 490
510

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 180
970
Melting Completion (Liquidus), °C 640
1420
Melting Onset (Solidus), °C 480
1370
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 140
15
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 99
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 3.0
7.7
Embodied Carbon, kg CO2/kg material 8.2
2.6
Embodied Energy, MJ/kg 150
37
Embodied Water, L/kg 1130
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 29
180
Resilience: Unit (Modulus of Resilience), kJ/m3 1310 to 1730
660
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 48 to 52
25
Strength to Weight: Bending, points 48 to 51
23
Thermal Diffusivity, mm2/s 53
4.0
Thermal Shock Resistance, points 23 to 25
19

Alloy Composition

Aluminum (Al), % 88 to 91.4
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0.18 to 0.28
19.5 to 21.5
Copper (Cu), % 1.2 to 2.0
0 to 1.0
Iron (Fe), % 0 to 0.2
66.6 to 75.5
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.1
4.0 to 6.0
Molybdenum (Mo), % 0
0 to 0.6
Nickel (Ni), % 0
1.0 to 3.0
Nitrogen (N), % 0
0.050 to 0.17
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.15
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.1 to 6.1
0
Residuals, % 0 to 0.15
0