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ASTM A732 Cast Steel vs. AZ91B Magnesium

ASTM A732 cast steel belongs to the iron alloys classification, while AZ91B magnesium belongs to the magnesium alloys. There are 30 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 A732 cast steel and the bottom bar is AZ91B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140 to 440
63
Elastic (Young's, Tensile) Modulus, GPa 190
46
Elongation at Break, % 4.0 to 25
5.0
Fatigue Strength, MPa 230 to 750
79
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72 to 73
18
Tensile Strength: Ultimate (UTS), MPa 460 to 1470
240
Tensile Strength: Yield (Proof), MPa 310 to 1340
160

Thermal Properties

Latent Heat of Fusion, J/g 250 to 260
360
Maximum Temperature: Mechanical, °C 400 to 430
130
Melting Completion (Liquidus), °C 1440 to 1460
600
Melting Onset (Solidus), °C 1400 to 1420
470
Specific Heat Capacity, J/kg-K 470 to 480
990
Thermal Conductivity, W/m-K 39 to 50
73
Thermal Expansion, µm/m-K 13
26

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 45 to 130
11
Resilience: Unit (Modulus of Resilience), kJ/m3 260 to 4770
280
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
69
Strength to Weight: Axial, points 16 to 52
38
Strength to Weight: Bending, points 17 to 37
49
Thermal Diffusivity, mm2/s 10 to 14
42
Thermal Shock Resistance, points 14 to 43
14