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Aluminum circles, as the name suggests, are aluminum materials with a circular shape. It is mainly made of aluminum alloy. They are usually made by stamping or cutting aluminum plates and have good conductivity, corrosion resistance and machinability. Common alloy series include 1 series, 3 series, 5 series, 6 series and 8 series, among which 1 series (such as 1060, 1070), 3 series (such as 3003), 5 series (such as 5052, 5083) and 6 series (such as 6061, 6063) are the most common.