3000 series aluminum alloy (Al-Mn series alloy) is an aluminum alloy with manganese as the main alloying element (manganese content is 1.0-1.5%), which is a non-heat-treatable strengthened aluminum alloy and can be strengthened by cold work hardening. It has high plasticity, good welding performance, higher strength than 1000 series aluminum alloy, and corrosion resistance similar to 1000 series aluminum alloy. It is a medium-strength aluminum alloy with good corrosion resistance. It has a wide range of uses and is used in large quantities. Main application range: seamless oil guide pipes (3003 alloy) used in aircraft, cans (3004 alloy). 3000 series aluminum alloys are represented by 3003 and 3A21.