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7175 Aluminum vs. AISI 309 Stainless Steel

7175 aluminum belongs to the aluminum alloys classification, while AISI 309 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 3.8 to 5.9
34 to 47
Fatigue Strength, MPa 150 to 180
250 to 280
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 26
78
Shear Strength, MPa 290 to 330
420 to 470
Tensile Strength: Ultimate (UTS), MPa 520 to 570
600 to 710
Tensile Strength: Yield (Proof), MPa 430 to 490
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 180
980
Melting Completion (Liquidus), °C 640
1450
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
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 99
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
19
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.6
Embodied Energy, MJ/kg 150
51
Embodied Water, L/kg 1130
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 29
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 1310 to 1730
170 to 310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 48 to 52
21 to 25
Strength to Weight: Bending, points 48 to 51
20 to 23
Thermal Diffusivity, mm2/s 53
4.3
Thermal Shock Resistance, points 23 to 25
14 to 16

Alloy Composition

Aluminum (Al), % 88 to 91.4
0
Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0.18 to 0.28
22 to 24
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 0 to 0.2
58 to 66
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.1
0 to 2.0
Nickel (Ni), % 0
12 to 15
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.15
0 to 0.75
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