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2218 Aluminum vs. ASTM Grade LC2-1 Steel

2218 aluminum belongs to the aluminum alloys classification, while ASTM grade LC2-1 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 ASTM grade LC2-1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95 to 110
240
Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 6.8 to 10
20
Fatigue Strength, MPa 110
430
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Tensile Strength: Ultimate (UTS), MPa 330 to 430
810
Tensile Strength: Yield (Proof), MPa 260 to 310
630

Thermal Properties

Latent Heat of Fusion, J/g 390
260
Maximum Temperature: Mechanical, °C 220
450
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
46
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 110
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 11
5.0
Density, g/cm3 3.1
7.9
Embodied Carbon, kg CO2/kg material 8.2
1.9
Embodied Energy, MJ/kg 150
25
Embodied Water, L/kg 1130
60

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
150
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
1040
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 30 to 39
29
Strength to Weight: Bending, points 34 to 41
25
Thermal Diffusivity, mm2/s 52
12
Thermal Shock Resistance, points 15 to 19
24

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0
Carbon (C), % 0
0 to 0.22
Chromium (Cr), % 0 to 0.1
1.4 to 1.9
Copper (Cu), % 3.5 to 4.5
0
Iron (Fe), % 0 to 1.0
92.5 to 95.3
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.2
0.55 to 0.75
Molybdenum (Mo), % 0
0.3 to 0.6
Nickel (Ni), % 1.7 to 2.3
2.5 to 3.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.9
0 to 0.5
Sulfur (S), % 0
0 to 0.045
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0