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AZ91D Magnesium vs. EN 1.7709 Steel

AZ91D magnesium belongs to the magnesium alloys classification, while EN 1.7709 steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (10, 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 AZ91D magnesium and the bottom bar is EN 1.7709 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
200 to 230
Elastic (Young's, Tensile) Modulus, GPa 46
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Tensile Strength: Ultimate (UTS), MPa 160 to 220
650 to 780

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 130
440
Melting Completion (Liquidus), °C 600
1470
Melting Onset (Solidus), °C 490
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 78
33
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 58
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 12
3.4
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
2.3
Embodied Energy, MJ/kg 160
32
Embodied Water, L/kg 990
56

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 26 to 34
23 to 27
Strength to Weight: Bending, points 38 to 46
21 to 24
Thermal Diffusivity, mm2/s 45
8.9
Thermal Shock Resistance, points 9.5 to 13
22 to 26

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.030
Carbon (C), % 0
0.17 to 0.25
Chromium (Cr), % 0
1.2 to 1.5
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
95.2 to 97.5
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0.4 to 0.8
Molybdenum (Mo), % 0
0.55 to 0.8
Nickel (Ni), % 0 to 0.0020
0 to 0.6
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.1
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.2 to 0.35
Zinc (Zn), % 0.35 to 1.0
0