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Automotive Grey Cast Iron vs. ISO-WD32260 Magnesium

Automotive grey cast iron belongs to the iron alloys classification, while ISO-WD32260 magnesium belongs to the magnesium 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 ISO-WD32260 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
46
Elongation at Break, % 9.6 to 14
4.5 to 6.0
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 69 to 70
18
Tensile Strength: Ultimate (UTS), MPa 140 to 290
330 to 340
Tensile Strength: Yield (Proof), MPa 94 to 200
230 to 250

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
330
Melting Completion (Liquidus), °C 1380 to 1390
600
Melting Onset (Solidus), °C 1340 to 1350
520
Specific Heat Capacity, J/kg-K 490
970
Thermal Conductivity, W/m-K 41 to 43
110
Thermal Expansion, µm/m-K 12 to 14
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
28
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
140

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9 to 3.0
13
Density, g/cm3 7.5 to 7.6
1.9
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
23
Embodied Energy, MJ/kg 21 to 24
160
Embodied Water, L/kg 44 to 51
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
14 to 19
Resilience: Unit (Modulus of Resilience), kJ/m3 25 to 110
560 to 700
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
63
Strength to Weight: Axial, points 5.2 to 11
48 to 51
Strength to Weight: Bending, points 8.0 to 13
56 to 58
Thermal Diffusivity, mm2/s 11 to 12
63
Thermal Shock Resistance, points 4.2 to 8.6
19 to 20