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Automotive Grey Cast Iron vs. 7204 Aluminum

Automotive grey cast iron belongs to the iron alloys classification, while 7204 aluminum belongs to the aluminum 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 automotive grey cast iron and the bottom bar is 7204 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
70
Elongation at Break, % 9.6 to 14
11 to 13
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 69 to 70
26
Tensile Strength: Ultimate (UTS), MPa 140 to 290
220 to 380
Tensile Strength: Yield (Proof), MPa 94 to 200
120 to 310

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
380
Melting Completion (Liquidus), °C 1380 to 1390
640
Melting Onset (Solidus), °C 1340 to 1350
520
Specific Heat Capacity, J/kg-K 490
880
Thermal Conductivity, W/m-K 41 to 43
150
Thermal Expansion, µm/m-K 12 to 14
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
39
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
120

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9 to 3.0
9.5
Density, g/cm3 7.5 to 7.6
2.9
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
8.4
Embodied Energy, MJ/kg 21 to 24
150
Embodied Water, L/kg 44 to 51
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
25 to 40
Resilience: Unit (Modulus of Resilience), kJ/m3 25 to 110
110 to 710
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 5.2 to 11
21 to 36
Strength to Weight: Bending, points 8.0 to 13
28 to 40
Thermal Diffusivity, mm2/s 11 to 12
58
Thermal Shock Resistance, points 4.2 to 8.6
9.4 to 16