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ASTM B631 Class A vs. K1A Magnesium

ASTM B631 class A belongs to the otherwise unclassified metals classification, while K1A magnesium belongs to the magnesium alloys. There are 16 material properties with values for both materials. Properties with values for just one material (16, 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 A and the bottom bar is K1A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
43
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 85 to 86
17

Thermal Properties

Latent Heat of Fusion, J/g 160
350
Melting Completion (Liquidus), °C 2680 to 2690
650
Specific Heat Capacity, J/kg-K 160
1000
Thermal Conductivity, W/m-K 420
120
Thermal Expansion, µm/m-K 11
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40 to 47
30
Electrical Conductivity: Equal Weight (Specific), % IACS 25 to 29
170

Otherwise Unclassified Properties

Density, g/cm3 15
1.6
Embodied Carbon, kg CO2/kg material 43
24
Embodied Energy, MJ/kg 670
170

Common Calculations

Stiffness to Weight: Axial, points 8.5
15
Stiffness to Weight: Bending, points 14
73
Thermal Diffusivity, mm2/s 180
75