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AWS BMg-1 vs. AWS E33-31

AWS BMg-1 belongs to the magnesium alloys classification, while AWS E33-31 belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (12, 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 AWS BMg-1 and the bottom bar is AWS E33-31.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 47
210
Elongation at Break, % 3.8
29
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 18
81
Tensile Strength: Ultimate (UTS), MPa 180
810

Thermal Properties

Latent Heat of Fusion, J/g 350
320
Melting Completion (Liquidus), °C 600
1380
Melting Onset (Solidus), °C 440
1330
Specific Heat Capacity, J/kg-K 980
480
Thermal Expansion, µm/m-K 26
14

Otherwise Unclassified Properties

Base Metal Price, % relative 12
36
Density, g/cm3 1.8
7.9
Embodied Carbon, kg CO2/kg material 22
6.0
Embodied Energy, MJ/kg 160
86
Embodied Water, L/kg 980
260

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 66
25
Strength to Weight: Axial, points 27
28
Strength to Weight: Bending, points 39
24
Thermal Shock Resistance, points 10
19

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Beryllium (Be), % 0.00020 to 0.00080
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
31 to 35
Copper (Cu), % 0 to 0.050
0.4 to 0.8
Iron (Fe), % 0 to 0.0050
24.7 to 34.8
Magnesium (Mg), % 86.1 to 89.8
0
Manganese (Mn), % 0.15 to 1.5
2.5 to 4.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 0 to 0.0050
30 to 32
Nitrogen (N), % 0
0.3 to 0.5
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.050
0 to 0.9
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 1.7 to 2.3
0
Residuals, % 0 to 0.3
0