According to the content of alloying elements, aluminum sheets can be divided into: 1××× series is industrial pure aluminum (Al), 2××× series is aluminum-copper alloy aluminum plate (Al--Cu), 3××× series is aluminum-manganese alloy Aluminum plate (Al--Mn), 4××× series is aluminum-silicon alloy aluminum plate (Al--Si), 5××× series is aluminum-magnesium alloy aluminum plate (Al--Mg), 6××× series is aluminum-magnesium Silicon alloy aluminum plate (AL--Mg--Si), 7××× series is aluminum-zinc alloy aluminum plate [AL--Zn--Mg--(Cu)], 8××× series is aluminum and other elements.