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7075-T6 Aluminum vs. SAE-AISI 1018 Steel

7075-T6 aluminum belongs to the aluminum alloys classification, while SAE-AISI 1018 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, 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 7075-T6 aluminum and the bottom bar is SAE-AISI 1018 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
130 to 140
Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 7.9
17 to 27
Fatigue Strength, MPa 160
180 to 270
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 330
280 to 300
Tensile Strength: Ultimate (UTS), MPa 560
430 to 480
Tensile Strength: Yield (Proof), MPa 480
240 to 400

Thermal Properties

Latent Heat of Fusion, J/g 380
250
Maximum Temperature: Mechanical, °C 200
400
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 480
1420
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 130
52
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 98
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.8
Density, g/cm3 3.0
7.9
Embodied Carbon, kg CO2/kg material 8.3
1.4
Embodied Energy, MJ/kg 150
18
Embodied Water, L/kg 1120
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 42
75 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 1630
150 to 430
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 51
15 to 17
Strength to Weight: Bending, points 50
16 to 17
Thermal Diffusivity, mm2/s 50
14
Thermal Shock Resistance, points 24
14 to 15

Alloy Composition


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Aluminum (Al), % 86.9 to 91.4
0
Carbon (C), % 0
0.15 to 0.2
Chromium (Cr), % 0.18 to 0.28
0
Copper (Cu), % 1.2 to 2.0
0
Iron (Fe), % 0 to 0.5
98.8 to 99.25
Magnesium (Mg), % 2.1 to 2.9
0
Manganese (Mn), % 0 to 0.3
0.6 to 0.9
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0
Sulfur (S), % 0
0 to 0.050
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 5.1 to 6.1
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0