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Automotive Malleable Cast Iron vs. QE22A Magnesium

Automotive malleable cast iron belongs to the iron alloys classification, while QE22A magnesium belongs to the magnesium alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, 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 malleable cast iron and the bottom bar is QE22A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130 to 290
80
Elastic (Young's, Tensile) Modulus, GPa 180
44
Elongation at Break, % 1.0 to 10
2.4
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 70
17
Tensile Strength: Ultimate (UTS), MPa 350 to 720
250
Tensile Strength: Yield (Proof), MPa 220 to 590
190

Thermal Properties

Latent Heat of Fusion, J/g 260
340
Melting Completion (Liquidus), °C 1410
640
Melting Onset (Solidus), °C 1370
570
Specific Heat Capacity, J/kg-K 480
970
Thermal Conductivity, W/m-K 41
110
Thermal Expansion, µm/m-K 14
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
25
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
120

Otherwise Unclassified Properties

Density, g/cm3 7.6
2.0
Embodied Carbon, kg CO2/kg material 1.5
27
Embodied Energy, MJ/kg 20
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.8 to 30
5.5
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 950
400
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
60
Strength to Weight: Axial, points 13 to 26
36
Strength to Weight: Bending, points 14 to 24
46
Thermal Diffusivity, mm2/s 11
59
Thermal Shock Resistance, points 9.9 to 21
15

Alloy Composition

Carbon (C), % 2.2 to 2.9
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 93.6 to 96.7
0
Magnesium (Mg), % 0
93.1 to 95.8
Manganese (Mn), % 0.15 to 1.3
0
Nickel (Ni), % 0
0 to 0.010
Phosphorus (P), % 0.020 to 0.15
0
Silicon (Si), % 0.9 to 1.9
0
Silver (Ag), % 0
2.0 to 3.0
Sulfur (S), % 0.020 to 0.2
0
Unspecified Rare Earths, % 0
1.8 to 2.5
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3