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SAE-AISI L2 Steel vs. 7175 Aluminum

SAE-AISI L2 steel belongs to the iron alloys classification, while 7175 aluminum belongs to the aluminum alloys. There are 23 material properties with values for both materials. Properties with values for just one material (7, 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 SAE-AISI L2 steel and the bottom bar is 7175 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 72
26
Tensile Strength: Ultimate (UTS), MPa 590 to 1960
520 to 570

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Melting Completion (Liquidus), °C 1450
640
Melting Onset (Solidus), °C 1410
480
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 44
140
Thermal Expansion, µm/m-K 12
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
33
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
99

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
10
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 1.9
8.2
Embodied Energy, MJ/kg 27
150
Embodied Water, L/kg 51
1130

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 21 to 70
48 to 52
Strength to Weight: Bending, points 20 to 45
48 to 51
Thermal Diffusivity, mm2/s 12
53
Thermal Shock Resistance, points 19 to 65
23 to 25

Alloy Composition

Aluminum (Al), % 0
88 to 91.4
Carbon (C), % 0.45 to 1.0
0
Chromium (Cr), % 0.7 to 1.2
0.18 to 0.28
Copper (Cu), % 0 to 0.25
1.2 to 2.0
Iron (Fe), % 95.5 to 98.7
0 to 0.2
Magnesium (Mg), % 0
2.1 to 2.9
Manganese (Mn), % 0.1 to 0.9
0 to 0.1
Molybdenum (Mo), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.15
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Vanadium (V), % 0.1 to 0.3
0
Zinc (Zn), % 0
5.1 to 6.1
Residuals, % 0
0 to 0.15