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AWS BMg-1 vs. AISI 418 Stainless Steel

AWS BMg-1 belongs to the magnesium alloys classification, while AISI 418 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 47
200
Elongation at Break, % 3.8
17
Fatigue Strength, MPa 72
520
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Shear Strength, MPa 100
680
Tensile Strength: Ultimate (UTS), MPa 180
1100
Tensile Strength: Yield (Proof), MPa 110
850

Thermal Properties

Latent Heat of Fusion, J/g 350
270
Maximum Temperature: Mechanical, °C 130
770
Melting Completion (Liquidus), °C 600
1500
Melting Onset (Solidus), °C 440
1460
Specific Heat Capacity, J/kg-K 980
470
Thermal Conductivity, W/m-K 76
25
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 55
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
15
Density, g/cm3 1.8
8.0
Embodied Carbon, kg CO2/kg material 22
2.9
Embodied Energy, MJ/kg 160
41
Embodied Water, L/kg 980
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.9
170
Resilience: Unit (Modulus of Resilience), kJ/m3 120
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 66
24
Strength to Weight: Axial, points 27
38
Strength to Weight: Bending, points 39
29
Thermal Diffusivity, mm2/s 43
6.7
Thermal Shock Resistance, points 10
40

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
0.15 to 0.2
Chromium (Cr), % 0
12 to 14
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
78.5 to 83.6
Magnesium (Mg), % 86.1 to 89.8
0
Manganese (Mn), % 0.15 to 1.5
0 to 0.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.0050
1.8 to 2.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.050
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
2.5 to 3.5
Zinc (Zn), % 1.7 to 2.3
0
Residuals, % 0 to 0.3
0