Aluminum casting alloys are alloys that are specifically designed for use in the casting process. These alloys typically contain a mixture of aluminum, silicon, copper, and magnesium, with other trace elements added to improve their mechanical and physical properties. The composition of the alloy can be adjusted to optimize its performance for specific applications, such as high strength, corrosion resistance, or thermal conductivity. Some commonly used aluminum casting alloys include A356, which is used for automotive parts, and 356, which is used for general purpose castings. Other alloys may be used for specific applications, such as aerospace or marine components, and may require additional processing or treatments to achieve the desired properties.