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2218 Aluminum vs. AWS ER90S-D2

2218 aluminum belongs to the aluminum alloys classification, while AWS ER90S-D2 belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 AWS ER90S-D2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 6.8 to 10
19
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Tensile Strength: Ultimate (UTS), MPa 330 to 430
710
Tensile Strength: Yield (Proof), MPa 260 to 310
600

Thermal Properties

Latent Heat of Fusion, J/g 390
260
Melting Completion (Liquidus), °C 640
1450
Melting Onset (Solidus), °C 510
1410
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 140
47
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 11
2.6
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.6
Embodied Energy, MJ/kg 150
21
Embodied Water, L/kg 1130
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
130
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
980
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 30 to 39
25
Strength to Weight: Bending, points 34 to 41
23
Thermal Diffusivity, mm2/s 52
13
Thermal Shock Resistance, points 15 to 19
21

Alloy Composition

Aluminum (Al), % 88.8 to 93.6
0
Carbon (C), % 0
0.070 to 0.12
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 3.5 to 4.5
0 to 0.5
Iron (Fe), % 0 to 1.0
95.2 to 97.4
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.2
1.6 to 2.1
Molybdenum (Mo), % 0
0.4 to 0.6
Nickel (Ni), % 1.7 to 2.3
0 to 0.15
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.9
0.5 to 0.8
Sulfur (S), % 0
0 to 0.025
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0
0 to 0.5