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ASTM B631 Class B vs. ZK40A Magnesium

ASTM B631 class B belongs to the otherwise unclassified metals classification, while ZK40A magnesium belongs to the magnesium alloys. There are 16 material properties with values for both materials. Properties with values for just one material (15, 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 B631 class B and the bottom bar is ZK40A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
45
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 78 to 79
17

Thermal Properties

Latent Heat of Fusion, J/g 150
340
Melting Completion (Liquidus), °C 2460 to 2480
600
Specific Heat Capacity, J/kg-K 170
970
Thermal Conductivity, W/m-K 450
110
Thermal Expansion, µm/m-K 12
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 50 to 53
27
Electrical Conductivity: Equal Weight (Specific), % IACS 32 to 34
130

Otherwise Unclassified Properties

Density, g/cm3 14
1.8
Embodied Carbon, kg CO2/kg material 49
24
Embodied Energy, MJ/kg 760
160

Common Calculations

Stiffness to Weight: Axial, points 8.1
14
Stiffness to Weight: Bending, points 14
65
Thermal Diffusivity, mm2/s 190
62