1 series: 1060 Features: more than 99.00% aluminum, good electrical conductivity, good corrosion resistance, good welding performance, low strength, no heat treatment strengthening. Application range: high purity aluminum (more than 99.9% aluminum) is mainly used for Scientific testing, chemical industry and special applications. 2 series: Features:: Aluminum alloy containing copper as the main element. Manganese, magnesium, lead and antimony are also added for machinability. Such as: 2011 alloy, pay attention to safety protection during the melting process (will produce harmful gases). The 2014 alloy uses the sky aviation industry with high strength. The 2017 alloy is a little weaker than the 2014 alloy, but it is easier to process. 2014 can be heat treated and strengthened. Disadvantages: The tendency of intergranular corrosion is serious. Applications: Aviation industry (2014 alloy), screws (2011 alloy) and industries with higher temperature (2017 alloy). 3 series: Features: Aluminum alloy with manganese as the main alloying element, can not be heat-treated and strengthened, has good corrosion resistance and good welding performance. Good plasticity. (close to super aluminum alloy). Disadvantages: low strength, but can be strengthened by cold work hardening. It is easy to produce coarse crystal grains during annealing. Applications: Oil-conducting seamless pipes (3003 alloy) and cans (3004 alloy) used on aircraft. 4 series: mainly based on silicon, not commonly used. Part 4 is heat treatable, but some 4 series alloys are not heat treatable. 5 series: Features: mainly magnesium. Good resistance, good welding performance, good fatigue strength, no heat treatment and strengthening, only cold processing to improve strength. Applications: lawn mower handles, aircraft fuel tank conduits, body armor. 6 series: Features: mainly magnesium and silicon. Mg2Si is the main strengthening phase and is currently the most widely used alloy. 6063, 6061 used the most, other 6082, 6160, 6125, 6262, 6060, 6005, 6463. 6063, 6060, and 6463 are relatively low in the 6 series. 6262, 6005, 6082, 6061 are relatively strong in the 6 series. Characteristics: medium strength, good corrosion resistance, good welding performance, good process performance (easy extrusion), good oxidation and coloring performance. Applications: Energy tools (eg car luggage racks, doors, windows, body, heat sink, compartment casing) 7 series: Features: mainly zinc, but sometimes a small amount of magnesium, copper. Among them, super-hard aluminum alloys contain the hardness of zinc, lead, magnesium and copper alloys close to steel. The extrusion speed is slower than that of the 6-series alloy, and the welding performance is good. 7005 and 7075 are the highest grades in the 7 Series and can be heat treated for reinforcement. Applications: Aviation (aircraft load-bearing components, landing gear), rockets, propellers, aviation spacecraft.