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Automotive Grey Cast Iron vs. EN AC-42200 Aluminum

Automotive grey cast iron belongs to the iron alloys classification, while EN AC-42200 aluminum belongs to the aluminum alloys. There are 28 material properties with values for both materials. Properties with values for just one material (2, 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 EN AC-42200 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 280
89 to 100
Elastic (Young's, Tensile) Modulus, GPa 180
70
Elongation at Break, % 9.6 to 14
3.0 to 6.7
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 69 to 70
26
Tensile Strength: Ultimate (UTS), MPa 140 to 290
320
Tensile Strength: Yield (Proof), MPa 94 to 200
240 to 260

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
500
Melting Completion (Liquidus), °C 1380 to 1390
610
Melting Onset (Solidus), °C 1340 to 1350
600
Specific Heat Capacity, J/kg-K 490
910
Thermal Conductivity, W/m-K 41 to 43
150
Thermal Expansion, µm/m-K 12 to 14
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
40
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
140

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9 to 3.0
9.5
Density, g/cm3 7.5 to 7.6
2.6
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
8.0
Embodied Energy, MJ/kg 21 to 24
150
Embodied Water, L/kg 44 to 51
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
9.0 to 20
Resilience: Unit (Modulus of Resilience), kJ/m3 25 to 110
410 to 490
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
53
Strength to Weight: Axial, points 5.2 to 11
34 to 35
Strength to Weight: Bending, points 8.0 to 13
40 to 41
Thermal Diffusivity, mm2/s 11 to 12
66
Thermal Shock Resistance, points 4.2 to 8.6
15