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AZ91D Magnesium vs. ASTM A732 Cast Steel

AZ91D magnesium belongs to the magnesium alloys classification, while ASTM A732 cast steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 AZ91D magnesium and the bottom bar is ASTM A732 cast steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
140 to 440
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 2.3 to 4.5
4.0 to 25
Fatigue Strength, MPa 74 to 85
230 to 750
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
72 to 73
Tensile Strength: Ultimate (UTS), MPa 160 to 220
460 to 1470
Tensile Strength: Yield (Proof), MPa 80 to 130
310 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 350
250 to 260
Maximum Temperature: Mechanical, °C 130
400 to 430
Melting Completion (Liquidus), °C 600
1440 to 1460
Melting Onset (Solidus), °C 490
1400 to 1420
Specific Heat Capacity, J/kg-K 990
470 to 480
Thermal Conductivity, W/m-K 78
39 to 50
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.1 to 7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 58
8.2 to 8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.0 to 3.8
Density, g/cm3 1.7
7.8 to 7.9
Embodied Carbon, kg CO2/kg material 22
1.4 to 1.7
Embodied Energy, MJ/kg 160
19 to 24
Embodied Water, L/kg 990
47 to 54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
45 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
260 to 4770
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 26 to 34
16 to 52
Strength to Weight: Bending, points 38 to 46
17 to 37
Thermal Diffusivity, mm2/s 45
10 to 14
Thermal Shock Resistance, points 9.5 to 13
14 to 43