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AWS BMg-1 vs. ASTM Grade HI Steel

AWS BMg-1 belongs to the magnesium alloys classification, while ASTM grade HI steel belongs to the iron alloys. There are 29 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 ASTM grade HI steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 47
200
Elongation at Break, % 3.8
11
Fatigue Strength, MPa 72
150
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 18
79
Tensile Strength: Ultimate (UTS), MPa 180
550
Tensile Strength: Yield (Proof), MPa 110
270

Thermal Properties

Latent Heat of Fusion, J/g 350
310
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1400
Melting Onset (Solidus), °C 440
1350
Specific Heat Capacity, J/kg-K 980
490
Thermal Conductivity, W/m-K 76
15
Thermal Expansion, µm/m-K 26
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 55
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
23
Density, g/cm3 1.8
7.8
Embodied Carbon, kg CO2/kg material 22
4.1
Embodied Energy, MJ/kg 160
59
Embodied Water, L/kg 980
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.9
52
Resilience: Unit (Modulus of Resilience), kJ/m3 120
180
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 66
25
Strength to Weight: Axial, points 27
20
Strength to Weight: Bending, points 39
19
Thermal Diffusivity, mm2/s 43
3.9
Thermal Shock Resistance, points 10
12

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
0.2 to 0.5
Chromium (Cr), % 0
26 to 30
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
46.9 to 59.8
Magnesium (Mg), % 86.1 to 89.8
0
Manganese (Mn), % 0.15 to 1.5
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0 to 0.0050
14 to 18
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.050
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 1.7 to 2.3
0
Residuals, % 0 to 0.3
0