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AZ91B Magnesium vs. ASTM A387 Grade 2 Steel

AZ91B magnesium belongs to the magnesium alloys classification, while ASTM A387 grade 2 steel belongs to the iron alloys. There are 31 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 AZ91B magnesium and the bottom bar is ASTM A387 grade 2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
140 to 170
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
25
Fatigue Strength, MPa 79
190 to 250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 140
300 to 350
Tensile Strength: Ultimate (UTS), MPa 240
470 to 550
Tensile Strength: Yield (Proof), MPa 160
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 360
250
Maximum Temperature: Mechanical, °C 130
420
Melting Completion (Liquidus), °C 600
1470
Melting Onset (Solidus), °C 470
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
45
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 58
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.6
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
1.6
Embodied Energy, MJ/kg 160
20
Embodied Water, L/kg 990
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
98 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 280
180 to 320
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
16 to 20
Strength to Weight: Bending, points 49
17 to 19
Thermal Diffusivity, mm2/s 42
12
Thermal Shock Resistance, points 14
14 to 16

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.050 to 0.21
Chromium (Cr), % 0
0.5 to 0.8
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
97.1 to 98.3
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.55 to 0.8
Molybdenum (Mo), % 0
0.45 to 0.6
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.5
0.15 to 0.4
Sulfur (S), % 0
0 to 0.025
Zinc (Zn), % 0.35 to 1.0
0