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AWS BMg-1 vs. ACI-ASTM CG6MMN Steel

AWS BMg-1 belongs to the magnesium alloys classification, while ACI-ASTM CG6MMN 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 AWS BMg-1 and the bottom bar is ACI-ASTM CG6MMN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 47
200
Elongation at Break, % 3.8
34
Fatigue Strength, MPa 72
260
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
79
Tensile Strength: Ultimate (UTS), MPa 180
670
Tensile Strength: Yield (Proof), MPa 110
320

Thermal Properties

Latent Heat of Fusion, J/g 350
300
Maximum Temperature: Mechanical, °C 130
1080
Melting Completion (Liquidus), °C 600
1420
Melting Onset (Solidus), °C 440
1380
Specific Heat Capacity, J/kg-K 980
480
Thermal Expansion, µm/m-K 26
17

Otherwise Unclassified Properties

Base Metal Price, % relative 12
22
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 22
4.8
Embodied Energy, MJ/kg 160
68
Embodied Water, L/kg 980
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.9
190
Resilience: Unit (Modulus of Resilience), kJ/m3 120
260
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 66
25
Strength to Weight: Axial, points 27
24
Strength to Weight: Bending, points 39
22
Thermal Shock Resistance, points 10
14

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 0.060
Chromium (Cr), % 0
20.5 to 23.5
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
51.9 to 62.1
Magnesium (Mg), % 86.1 to 89.8
0
Manganese (Mn), % 0.15 to 1.5
4.0 to 6.0
Molybdenum (Mo), % 0
1.5 to 3.0
Nickel (Ni), % 0 to 0.0050
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.050
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.1 to 0.3
Zinc (Zn), % 1.7 to 2.3
0
Residuals, % 0 to 0.3
0