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SAE-AISI L6 Steel vs. 7049 Aluminum

SAE-AISI L6 steel belongs to the iron alloys classification, while 7049 aluminum belongs to the aluminum alloys. There are 23 material properties with values for both materials. Properties with values for just one material (8, 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 L6 steel and the bottom bar is 7049 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
27
Tensile Strength: Ultimate (UTS), MPa 670 to 2090
510 to 530

Thermal Properties

Latent Heat of Fusion, J/g 250
370
Melting Completion (Liquidus), °C 1450
640
Melting Onset (Solidus), °C 1410
480
Specific Heat Capacity, J/kg-K 470
860
Thermal Conductivity, W/m-K 42
130
Thermal Expansion, µm/m-K 11
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.6
36
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
110

Otherwise Unclassified Properties

Base Metal Price, % relative 3.6
10
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 2.0
8.1
Embodied Energy, MJ/kg 28
140
Embodied Water, L/kg 54
1110

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 24 to 74
46 to 47
Strength to Weight: Bending, points 22 to 46
46 to 47
Thermal Diffusivity, mm2/s 11
51
Thermal Shock Resistance, points 22 to 70
22 to 23

Alloy Composition

Aluminum (Al), % 0
85.7 to 89.5
Carbon (C), % 0.65 to 0.75
0
Chromium (Cr), % 0.6 to 1.2
0.1 to 0.22
Copper (Cu), % 0 to 0.25
1.2 to 1.9
Iron (Fe), % 93.6 to 97.3
0 to 0.35
Magnesium (Mg), % 0
2.0 to 2.9
Manganese (Mn), % 0.25 to 0.8
0 to 0.2
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 1.3 to 2.0
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.25
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Vanadium (V), % 0 to 0.3
0
Zinc (Zn), % 0
7.2 to 8.2
Residuals, % 0
0 to 0.15