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2218 Aluminum vs. EN 1.7027 Steel

2218 aluminum belongs to the aluminum alloys classification, while EN 1.7027 steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (6, 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 2218 aluminum and the bottom bar is EN 1.7027 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95 to 110
150 to 180
Elastic (Young's, Tensile) Modulus, GPa 73
190
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Tensile Strength: Ultimate (UTS), MPa 330 to 430
490 to 1460

Thermal Properties

Latent Heat of Fusion, J/g 390
250
Maximum Temperature: Mechanical, °C 220
420
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 510
1420
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 140
45
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 11
2.3
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.4
Embodied Energy, MJ/kg 150
19
Embodied Water, L/kg 1130
51

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 30 to 39
17 to 52
Strength to Weight: Bending, points 34 to 41
18 to 36
Thermal Diffusivity, mm2/s 52
12
Thermal Shock Resistance, points 15 to 19
14 to 43

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0 to 0.050
Carbon (C), % 0
0.17 to 0.23
Chromium (Cr), % 0 to 0.1
0.9 to 1.2
Copper (Cu), % 3.5 to 4.5
0 to 0.3
Iron (Fe), % 0 to 1.0
97.1 to 98.5
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.2
0.6 to 0.9
Nickel (Ni), % 1.7 to 2.3
0
Oxygen (O), % 0
0 to 0.0020
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.9
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0