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EN-MC21320 Magnesium vs. Grey Cast Iron

EN-MC21320 magnesium belongs to the magnesium alloys classification, while grey cast iron belongs to the iron alloys. There are 30 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 EN-MC21320 magnesium and the bottom bar is grey cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 68
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 45
180
Elongation at Break, % 7.5
9.6
Fatigue Strength, MPa 95
69 to 170
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
69
Shear Strength, MPa 130
180 to 610
Tensile Strength: Ultimate (UTS), MPa 230
160 to 450
Tensile Strength: Yield (Proof), MPa 140
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 370
280
Melting Completion (Liquidus), °C 600
1380
Melting Onset (Solidus), °C 530
1180
Specific Heat Capacity, J/kg-K 1000
490
Thermal Conductivity, W/m-K 66
46
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 91
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
1.9
Density, g/cm3 1.6
7.5
Embodied Carbon, kg CO2/kg material 23
1.5
Embodied Energy, MJ/kg 160
21
Embodied Water, L/kg 980
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 200
27 to 240
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 72
25
Strength to Weight: Axial, points 38
5.8 to 17
Strength to Weight: Bending, points 50
8.7 to 17
Thermal Diffusivity, mm2/s 40
13
Thermal Shock Resistance, points 13
6.0 to 17

Alloy Composition


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Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
3.1 to 3.4
Copper (Cu), % 0 to 0.010
0
Iron (Fe), % 0 to 0.0050
92.1 to 93.9
Magnesium (Mg), % 92.5 to 95.9
0
Manganese (Mn), % 0.1 to 0.7
0.5 to 0.7
Nickel (Ni), % 0 to 0.0020
0
Phosphorus (P), % 0
0 to 0.9
Silicon (Si), % 0.5 to 1.5
2.5 to 2.8
Sulfur (S), % 0
0 to 0.15
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.010
0