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ACI-ASTM CA40 Steel vs. Gallium Arsenide

ACI-ASTM CA40 steel and gallium arsenide belong to fundamentally different material chemistries. ACI-ASTM CA40 steel is a metal, while gallium arsenide is a ceramic material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 10 material properties with values for both materials. Properties with values for just one material (25, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CA40 steel and the bottom bar is gallium arsenide.

ACI-ASTM CA40 (SCS2A, J91153) Cast Stainless SteelGallium Arsenide (GaAs) Optical Material
Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 7.7
5.3
Elastic (Young's, Tensile) Modulus, GPa 190
85
Melting Onset (Solidus), °C 1500
1400
Poisson's Ratio 0.28
0.31
Specific Heat Capacity, J/kg-K 480
360
Stiffness to Weight: Axial, points 14
8.9
Stiffness to Weight: Bending, points 25
28
Thermal Conductivity, W/m-K 25
47
Thermal Diffusivity, mm2/s 6.7
25
Thermal Expansion, µm/m-K 10
5.6