1 xxx aluminum: aluminum content is 99%(min) , good conductivity, good corrosion resistance, good welding performance, low strength, no heat treatment hardening. 

Application range: As its high purity  ,1xxx aluminum   is mainly used in scientific testing, chemical industry and transformers  etc.

 2 xxx aluminum alloy :    Copper is the main element of the containing aluminum alloy. Manganese, magnesium, lead and bismuth are also added.  For instance ,2011 alloy, in the melting process,   safety protection is highly concerned  (for this will produce harmful gases). 2014 aluminum  alloy is mainly used in  aerospace industry, due to its high strength. 2017 alloys  2014 alloy strength, but it is easier to process. 2014 can be enhanced by heat treatment. Disadvantage: intergranular corrosion tendency is serious. Applications: Aviation industry (2014 alloy), Screws (2011 alloys) and industry with high temperature (2017 alloy).

 3xxx aluminum alloy : Wiht manganese  elements  in it , 3xxx aluminum  alloy is of  heat-resistant hardening, good corrosion resistance, good welding performance,good plasticity(close to ultra-aluminum alloy). 

Disadvantages: low strength,(but it can be hardened by cold processing to strengthen the strength. )It is easy to produce coarse grains during annealing. 

Application: The oil-conducting seamless tube (3003 alloy), cans (3004 alloy),  aircraft etc.

 4xxx aluminum alloy :  Silicon is added in this alloy .  Some 4 series can be strengthened by heat treatment, but some 4 series alloys are not heat-treated.

 5xxx aluminum alloy :  Magnesium Iis added in it. .It is of  good resistance, good welding performance, good fatigue strength, but it is not suitable for    heat treatment . Cold processing  is suitable for improving its  strength. 

Application range: mower handle, airplane fuel tank conduit, bulletproof vest.

 6 xxxx aluminum alloy:  With magnesium and silicon  in it , it is the most widely used alloy in the main hardening phase. 6063, 6061 aluminum allloy products  are very common. You can see 6082, 6160, 6125, 6262, 6060, 6005, 6463 aluminum alloy products too. The strength ratio of 6063, 6060 and 6463 is low  in 6xxx aluminum alloy   . The strength ratio of 6262, 6005, 6082 and 6061 is high  in 6xxx aluminum alloy . 

 Characters :Medium strength, good corrosion resistance, good welding performance, good process performance (easy  for extrusion molding) oxidation coloring performance. 

Application scope: Hand tools (such as: Car rack, door, window, body, heat sink, Case enclosure)

 7xxx aluminum alloy  :  Wiht zinc  and sometimes   a small amount of magnesium, copper in it,  this aluminum alloy is superhard( close to the steel). The extrusion speed is slower than 6xxx  aluminum alloy, and the welding performance is good. 7005 and 7075 are the highest grade in  7xxx aluminum alloy , which can be enhanced by heat treatment. 

Scope of application: aviation (aircraft bearing components, landing gear), rockets, propellers, aircraft spacecraft.