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6018 Aluminum vs. SAE-AISI P5 Steel

6018 aluminum belongs to the aluminum alloys classification, while SAE-AISI P5 steel belongs to the iron 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 6018 aluminum and the bottom bar is SAE-AISI P5 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Tensile Strength: Ultimate (UTS), MPa 290 to 300
370 to 1980

Thermal Properties

Latent Heat of Fusion, J/g 400
250
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 570
1420
Specific Heat Capacity, J/kg-K 890
470
Thermal Conductivity, W/m-K 170
45
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 140
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.8
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1180
56

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 48
24
Strength to Weight: Axial, points 28 to 29
13 to 70
Strength to Weight: Bending, points 34 to 35
15 to 45
Thermal Diffusivity, mm2/s 65
12
Thermal Shock Resistance, points 13
12 to 65

Alloy Composition

Aluminum (Al), % 93.1 to 97.8
0
Bismuth (Bi), % 0.4 to 0.7
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0 to 0.1
2.0 to 2.5
Copper (Cu), % 0.15 to 0.4
0 to 0.25
Iron (Fe), % 0 to 0.7
95.7 to 97.8
Lead (Pb), % 0.4 to 1.2
0
Magnesium (Mg), % 0.6 to 1.2
0
Manganese (Mn), % 0.3 to 0.8
0.2 to 0.6
Nickel (Ni), % 0
0 to 0.35
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.5 to 1.2
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 0.3
0
Residuals, % 0 to 0.15
0