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AZ91D Magnesium vs. EN 1.4931 Steel

AZ91D magnesium belongs to the magnesium alloys classification, while EN 1.4931 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, 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 1.4931 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
240
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 2.3 to 4.5
17
Fatigue Strength, MPa 74 to 85
410
Impact Strength: V-Notched Charpy, J 2.7
30
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
76
Tensile Strength: Ultimate (UTS), MPa 160 to 220
810
Tensile Strength: Yield (Proof), MPa 80 to 130
620

Thermal Properties

Latent Heat of Fusion, J/g 350
270
Maximum Temperature: Mechanical, °C 130
600
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 490
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 78
24
Thermal Expansion, µm/m-K 27
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
9.8
Electrical Conductivity: Equal Weight (Specific), % IACS 58
11

Otherwise Unclassified Properties

Base Metal Price, % relative 12
8.5
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
2.9
Embodied Energy, MJ/kg 160
42
Embodied Water, L/kg 990
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
130
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
970
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 26 to 34
29
Strength to Weight: Bending, points 38 to 46
25
Thermal Diffusivity, mm2/s 45
6.5
Thermal Shock Resistance, points 9.5 to 13
22

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.2 to 0.26
Chromium (Cr), % 0
11.3 to 12.2
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
83.2 to 86.8
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0.5 to 0.8
Molybdenum (Mo), % 0
1.0 to 1.2
Nickel (Ni), % 0 to 0.0020
0 to 1.0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.1
0 to 0.4
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 0
0 to 0.5
Vanadium (V), % 0
0.25 to 0.35
Zinc (Zn), % 0.35 to 1.0
0