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AZ91B Magnesium vs. EN 1.3551 Steel

AZ91B magnesium belongs to the magnesium alloys classification, while EN 1.3551 steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (9, 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 AZ91B magnesium and the bottom bar is EN 1.3551 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
220
Elastic (Young's, Tensile) Modulus, GPa 46
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
75
Tensile Strength: Ultimate (UTS), MPa 240
720

Thermal Properties

Latent Heat of Fusion, J/g 360
260
Maximum Temperature: Mechanical, °C 130
530
Melting Completion (Liquidus), °C 600
1490
Melting Onset (Solidus), °C 470
1450
Specific Heat Capacity, J/kg-K 990
460
Thermal Conductivity, W/m-K 73
36
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
8.6
Electrical Conductivity: Equal Weight (Specific), % IACS 58
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.0
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
4.9
Embodied Energy, MJ/kg 160
71
Embodied Water, L/kg 990
82

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
26
Strength to Weight: Bending, points 49
23
Thermal Diffusivity, mm2/s 42
9.8
Thermal Shock Resistance, points 14
21

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.77 to 0.85
Chromium (Cr), % 0
3.9 to 4.3
Copper (Cu), % 0 to 0.35
0 to 0.3
Iron (Fe), % 0
88.8 to 91.1
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.15 to 0.35
Molybdenum (Mo), % 0
4.0 to 4.5
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.5
0 to 0.4
Sulfur (S), % 0
0 to 0.015
Tungsten (W), % 0
0 to 0.25
Vanadium (V), % 0
0.9 to 1.1
Zinc (Zn), % 0.35 to 1.0
0