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ASTM A387 Grade 91 Class 2 vs. AZ91B Magnesium

ASTM A387 grade 91 class 2 belongs to the iron alloys classification, while AZ91B magnesium belongs to the magnesium 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 ASTM A387 grade 91 class 2 and the bottom bar is AZ91B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
63
Elastic (Young's, Tensile) Modulus, GPa 190
46
Elongation at Break, % 20
5.0
Fatigue Strength, MPa 330
79
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
18
Shear Strength, MPa 420
140
Tensile Strength: Ultimate (UTS), MPa 670
240
Tensile Strength: Yield (Proof), MPa 470
160

Thermal Properties

Latent Heat of Fusion, J/g 270
360
Maximum Temperature: Mechanical, °C 600
130
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1420
470
Specific Heat Capacity, J/kg-K 470
990
Thermal Conductivity, W/m-K 26
73
Thermal Expansion, µm/m-K 13
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
11
Electrical Conductivity: Equal Weight (Specific), % IACS 10
58

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 2.6
22
Embodied Energy, MJ/kg 37
160
Embodied Water, L/kg 88
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
11
Resilience: Unit (Modulus of Resilience), kJ/m3 580
280
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 24
38
Strength to Weight: Bending, points 22
49
Thermal Diffusivity, mm2/s 6.9
42
Thermal Shock Resistance, points 19
14

Alloy Composition

Aluminum (Al), % 0 to 0.020
8.3 to 9.7
Carbon (C), % 0.080 to 0.12
0
Chromium (Cr), % 8.0 to 9.5
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 87.3 to 90.3
0
Magnesium (Mg), % 0
87.9 to 91.2
Manganese (Mn), % 0.3 to 0.6
0.13 to 0.5
Molybdenum (Mo), % 0.85 to 1.1
0
Nickel (Ni), % 0 to 0.4
0 to 0.030
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.020
0
Silicon (Si), % 0.2 to 0.5
0 to 0.5
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zinc (Zn), % 0
0.35 to 1.0
Zirconium (Zr), % 0 to 0.010
0