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2218 Aluminum vs. ACI-ASTM CA6N Steel

2218 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CA6N steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 ACI-ASTM CA6N steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 6.8 to 10
17
Fatigue Strength, MPa 110
640
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
75
Tensile Strength: Ultimate (UTS), MPa 330 to 430
1080
Tensile Strength: Yield (Proof), MPa 260 to 310
1060

Thermal Properties

Latent Heat of Fusion, J/g 390
280
Maximum Temperature: Mechanical, °C 220
740
Melting Completion (Liquidus), °C 640
1440
Melting Onset (Solidus), °C 510
1400
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 140
23
Thermal Expansion, µm/m-K 22
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 110
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 11
11
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.2
2.5
Embodied Energy, MJ/kg 150
35
Embodied Water, L/kg 1130
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
180
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
2900
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 30 to 39
38
Strength to Weight: Bending, points 34 to 41
30
Thermal Diffusivity, mm2/s 52
6.1
Thermal Shock Resistance, points 15 to 19
40

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0
Carbon (C), % 0
0 to 0.060
Chromium (Cr), % 0 to 0.1
10.5 to 12.5
Copper (Cu), % 3.5 to 4.5
0
Iron (Fe), % 0 to 1.0
77.9 to 83.5
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.2
0 to 0.5
Nickel (Ni), % 1.7 to 2.3
6.0 to 8.0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.9
0 to 1.0
Sulfur (S), % 0
0 to 0.020
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0