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Grey Cast Iron vs. QE22A Magnesium

Grey cast iron belongs to the iron alloys classification, while QE22A magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 grey cast iron and the bottom bar is QE22A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 300
80
Compressive (Crushing) Strength, MPa 570 to 1290
350
Elastic (Young's, Tensile) Modulus, GPa 180
44
Elongation at Break, % 9.6
2.4
Fatigue Strength, MPa 69 to 170
110
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 69
17
Shear Strength, MPa 180 to 610
150
Tensile Strength: Ultimate (UTS), MPa 160 to 450
250
Tensile Strength: Yield (Proof), MPa 98 to 290
190

Thermal Properties

Latent Heat of Fusion, J/g 280
340
Melting Completion (Liquidus), °C 1380
640
Melting Onset (Solidus), °C 1180
570
Specific Heat Capacity, J/kg-K 490
970
Thermal Conductivity, W/m-K 46
110
Thermal Expansion, µm/m-K 11
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
25
Electrical Conductivity: Equal Weight (Specific), % IACS 8.9
120

Otherwise Unclassified Properties

Density, g/cm3 7.5
2.0
Embodied Carbon, kg CO2/kg material 1.5
27
Embodied Energy, MJ/kg 21
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 13 to 37
5.5
Resilience: Unit (Modulus of Resilience), kJ/m3 27 to 240
400
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
60
Strength to Weight: Axial, points 5.8 to 17
36
Strength to Weight: Bending, points 8.7 to 17
46
Thermal Diffusivity, mm2/s 13
59
Thermal Shock Resistance, points 6.0 to 17
15

Alloy Composition

Carbon (C), % 3.1 to 3.4
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 92.1 to 93.9
0
Magnesium (Mg), % 0
93.1 to 95.8
Manganese (Mn), % 0.5 to 0.7
0
Nickel (Ni), % 0
0 to 0.010
Phosphorus (P), % 0 to 0.9
0
Silicon (Si), % 2.5 to 2.8
0
Silver (Ag), % 0
2.0 to 3.0
Sulfur (S), % 0 to 0.15
0
Unspecified Rare Earths, % 0
1.8 to 2.5
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3