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AZ91B Magnesium vs. Grade VDSiCr Steel

AZ91B magnesium belongs to the magnesium alloys classification, while grade VDSiCr 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 grade VDSiCr steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
590
Elastic (Young's, Tensile) Modulus, GPa 46
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
80
Tensile Strength: Ultimate (UTS), MPa 240
1950

Thermal Properties

Latent Heat of Fusion, J/g 360
270
Maximum Temperature: Mechanical, °C 130
410
Melting Completion (Liquidus), °C 600
1440
Melting Onset (Solidus), °C 470
1400
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
46
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 58
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.2
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
1.5
Embodied Energy, MJ/kg 160
20
Embodied Water, L/kg 990
48

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
70
Strength to Weight: Bending, points 49
45
Thermal Diffusivity, mm2/s 42
12
Thermal Shock Resistance, points 14
58

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.5 to 0.6
Chromium (Cr), % 0
0.5 to 0.8
Copper (Cu), % 0 to 0.35
0 to 0.060
Iron (Fe), % 0
96.6 to 97.8
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.5 to 0.9
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.5
1.2 to 1.6
Sulfur (S), % 0
0 to 0.020
Zinc (Zn), % 0.35 to 1.0
0