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2218 Aluminum vs. Automotive Grey Cast Iron

2218 aluminum belongs to the aluminum alloys classification, while automotive grey cast iron belongs to the iron alloys. There are 28 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 automotive grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95 to 110
160 to 280
Elastic (Young's, Tensile) Modulus, GPa 73
180
Elongation at Break, % 6.8 to 10
9.6 to 14
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
69 to 70
Tensile Strength: Ultimate (UTS), MPa 330 to 430
140 to 290
Tensile Strength: Yield (Proof), MPa 260 to 310
94 to 200

Thermal Properties

Latent Heat of Fusion, J/g 390
260 to 280
Melting Completion (Liquidus), °C 640
1380 to 1390
Melting Onset (Solidus), °C 510
1340 to 1350
Specific Heat Capacity, J/kg-K 870
490
Thermal Conductivity, W/m-K 140
41 to 43
Thermal Expansion, µm/m-K 22
12 to 14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
7.4 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.8 to 9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 11
1.9 to 3.0
Density, g/cm3 3.1
7.5 to 7.6
Embodied Carbon, kg CO2/kg material 8.2
1.5 to 1.7
Embodied Energy, MJ/kg 150
21 to 24
Embodied Water, L/kg 1130
44 to 51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
18 to 25
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
25 to 110
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 30 to 39
5.2 to 11
Strength to Weight: Bending, points 34 to 41
8.0 to 13
Thermal Diffusivity, mm2/s 52
11 to 12
Thermal Shock Resistance, points 15 to 19
4.2 to 8.6