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AWS BMg-1 vs. ASTM A387 Grade 21L Class 1

AWS BMg-1 belongs to the magnesium alloys classification, while ASTM A387 grade 21L class 1 belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 ASTM A387 grade 21L class 1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 47
190
Elongation at Break, % 3.8
21
Fatigue Strength, MPa 72
160
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
74
Shear Strength, MPa 100
310
Tensile Strength: Ultimate (UTS), MPa 180
500
Tensile Strength: Yield (Proof), MPa 110
230

Thermal Properties

Latent Heat of Fusion, J/g 350
260
Maximum Temperature: Mechanical, °C 130
480
Melting Completion (Liquidus), °C 600
1470
Melting Onset (Solidus), °C 440
1430
Specific Heat Capacity, J/kg-K 980
470
Thermal Conductivity, W/m-K 76
41
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 55
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 12
4.1
Density, g/cm3 1.8
7.9
Embodied Carbon, kg CO2/kg material 22
1.8
Embodied Energy, MJ/kg 160
23
Embodied Water, L/kg 980
62

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.9
84
Resilience: Unit (Modulus of Resilience), kJ/m3 120
140
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 66
24
Strength to Weight: Axial, points 27
18
Strength to Weight: Bending, points 39
18
Thermal Diffusivity, mm2/s 43
11
Thermal Shock Resistance, points 10
14

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Beryllium (Be), % 0.00020 to 0.00080
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0
2.8 to 3.3
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
94.4 to 96.1
Magnesium (Mg), % 86.1 to 89.8
0
Manganese (Mn), % 0.15 to 1.5
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 0 to 0.0050
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.050
0 to 0.5
Sulfur (S), % 0
0 to 0.025
Zinc (Zn), % 1.7 to 2.3
0
Residuals, % 0 to 0.3
0