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2218 Aluminum vs. SAE-AISI 1008 Steel

2218 aluminum belongs to the aluminum alloys classification, while SAE-AISI 1008 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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 SAE-AISI 1008 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95 to 110
93 to 100
Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 6.8 to 10
22 to 33
Fatigue Strength, MPa 110
150 to 220
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 210 to 250
220 to 230
Tensile Strength: Ultimate (UTS), MPa 330 to 430
330 to 370
Tensile Strength: Yield (Proof), MPa 260 to 310
190 to 310

Thermal Properties

Latent Heat of Fusion, J/g 390
250
Maximum Temperature: Mechanical, °C 220
400
Melting Completion (Liquidus), °C 640
1470
Melting Onset (Solidus), °C 510
1430
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 140
62
Thermal Expansion, µm/m-K 22
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
6.9
Electrical Conductivity: Equal Weight (Specific), % IACS 110
7.9

Otherwise Unclassified Properties

Base Metal Price, % relative 11
1.8
Density, g/cm3 3.1
7.9
Embodied Carbon, kg CO2/kg material 8.2
1.4
Embodied Energy, MJ/kg 150
18
Embodied Water, L/kg 1130
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
78 to 91
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
92 to 260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 30 to 39
12 to 13
Strength to Weight: Bending, points 34 to 41
13 to 15
Thermal Diffusivity, mm2/s 52
17
Thermal Shock Resistance, points 15 to 19
10 to 12

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
0
Iron (Fe), % 0 to 1.0
99.31 to 99.7
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.2
0.3 to 0.5
Nickel (Ni), % 1.7 to 2.3
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.9
0
Sulfur (S), % 0
0 to 0.050
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0