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ASTM B631 Class A vs. 238.0 Aluminum

ASTM B631 class A belongs to the otherwise unclassified metals classification, while 238.0 aluminum belongs to the aluminum alloys. There are 16 material properties with values for both materials. Properties with values for just one material (14, 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 238.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
76
Poisson's Ratio 0.3
0.33
Shear Modulus, GPa 85 to 86
28

Thermal Properties

Latent Heat of Fusion, J/g 160
430
Melting Completion (Liquidus), °C 2680 to 2690
600
Specific Heat Capacity, J/kg-K 160
840
Thermal Conductivity, W/m-K 420
100
Thermal Expansion, µm/m-K 11
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40 to 47
25
Electrical Conductivity: Equal Weight (Specific), % IACS 25 to 29
67

Otherwise Unclassified Properties

Density, g/cm3 15
3.4
Embodied Carbon, kg CO2/kg material 43
7.4
Embodied Energy, MJ/kg 670
140

Common Calculations

Stiffness to Weight: Axial, points 8.5
12
Stiffness to Weight: Bending, points 14
42
Thermal Diffusivity, mm2/s 180
37