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7175 Aluminum vs. S36200 Stainless Steel

7175 aluminum belongs to the aluminum alloys classification, while S36200 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 S36200 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 3.8 to 5.9
3.4 to 4.6
Fatigue Strength, MPa 150 to 180
450 to 570
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 26
76
Shear Strength, MPa 290 to 330
680 to 810
Tensile Strength: Ultimate (UTS), MPa 520 to 570
1180 to 1410
Tensile Strength: Yield (Proof), MPa 430 to 490
960 to 1240

Thermal Properties

Latent Heat of Fusion, J/g 380
280
Maximum Temperature: Mechanical, °C 180
820
Melting Completion (Liquidus), °C 640
1440
Melting Onset (Solidus), °C 480
1400
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 140
16
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 99
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.2
2.8
Embodied Energy, MJ/kg 150
40
Embodied Water, L/kg 1130
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 29
46 to 51
Resilience: Unit (Modulus of Resilience), kJ/m3 1310 to 1730
2380 to 3930
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 48 to 52
42 to 50
Strength to Weight: Bending, points 48 to 51
32 to 36
Thermal Diffusivity, mm2/s 53
4.3
Thermal Shock Resistance, points 23 to 25
40 to 48

Alloy Composition

Aluminum (Al), % 88 to 91.4
0 to 0.1
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0.18 to 0.28
14 to 14.5
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 0 to 0.2
75.4 to 79.5
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.1
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.3
Nickel (Ni), % 0
6.5 to 7.0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.15
0 to 0.3
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.1
0.6 to 0.9
Zinc (Zn), % 5.1 to 6.1
0
Residuals, % 0 to 0.15
0