Aluminum cans are the most commonly used beverage packaging materials in life. The aluminum for cans is mainly composed of three kinds of aluminum alloys with different compositions: 3004 aluminum for can body, 5052 aluminium coil for caps and 5182 aluminum for pull ring. Aluminum alloy is the key to making the can, the shape is not formed and the pull of the can lid can not open are all because of the aluminum alloy. Thus, the right aluminum alloy should be usedi n the right places of aluminum cans.