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AZ91B Magnesium vs. AWS E316H

AZ91B magnesium belongs to the magnesium alloys classification, while AWS E316H belongs to the iron alloys. There are 24 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 AZ91B magnesium and the bottom bar is AWS E316H.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
34
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
78
Tensile Strength: Ultimate (UTS), MPa 240
580

Thermal Properties

Latent Heat of Fusion, J/g 360
290
Melting Completion (Liquidus), °C 600
1440
Melting Onset (Solidus), °C 470
1390
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
15
Thermal Expansion, µm/m-K 26
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 58
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 12
20
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
4.0
Embodied Energy, MJ/kg 160
55
Embodied Water, L/kg 990
160

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
21
Strength to Weight: Bending, points 49
20
Thermal Diffusivity, mm2/s 42
4.0
Thermal Shock Resistance, points 14
15

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.040 to 0.080
Chromium (Cr), % 0
17 to 20
Copper (Cu), % 0 to 0.35
0 to 0.75
Iron (Fe), % 0
58.6 to 69.5
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.5 to 2.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0 to 0.030
11 to 14
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0