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7175 Aluminum vs. SAE-AISI 1340 Steel

7175 aluminum belongs to the aluminum alloys classification, while SAE-AISI 1340 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, 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 SAE-AISI 1340 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 3.8 to 5.9
11 to 23
Fatigue Strength, MPa 150 to 180
220 to 390
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
72
Shear Strength, MPa 290 to 330
340 to 440
Tensile Strength: Ultimate (UTS), MPa 520 to 570
540 to 730
Tensile Strength: Yield (Proof), MPa 430 to 490
300 to 620

Thermal Properties

Latent Heat of Fusion, J/g 380
250
Maximum Temperature: Mechanical, °C 180
400
Melting Completion (Liquidus), °C 640
1450
Melting Onset (Solidus), °C 480
1410
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 140
51
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 99
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.9
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.4
Embodied Energy, MJ/kg 150
19
Embodied Water, L/kg 1130
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 29
78 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 1310 to 1730
240 to 1040
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 48 to 52
19 to 26
Strength to Weight: Bending, points 48 to 51
19 to 23
Thermal Diffusivity, mm2/s 53
14
Thermal Shock Resistance, points 23 to 25
17 to 23

Alloy Composition

Aluminum (Al), % 88 to 91.4
0
Carbon (C), % 0
0.38 to 0.43
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 0 to 0.2
97.2 to 97.9
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.1
1.6 to 1.9
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.15
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.1 to 6.1
0
Residuals, % 0 to 0.15
0