Series 1: Al pure aluminum
Features: Contains more than 99.00% aluminum, good electrical conductivity, good corrosion resistance, good welding performance, low strength, and cannot be strengthened by heat treatment.
Scope of application: High-purity aluminum (containing more than 99.9% aluminum) is mainly used for lighting fixtures, reflectors, decorations, chemical industry containers, heat sinks, welding wires, conductive materials and special purposes.
Typical grade: 1050 (aluminum content above 99.5%) for extruded coils for food, chemical and brewing industries. 1060 (with aluminum content of more than 99.6%) is used in occasions where high corrosion resistance and formability are required, but the strength requirements are not high.
2 series: Al – Cu aluminum copper alloy
Features: An aluminum alloy containing copper as the main compound element. Manganese, magnesium, lead and bismuth are also added for machinability. The disadvantage is that the intergranular corrosion tendency is serious.
Application range: aviation industry (2014 alloy), screws (2011 alloy) and industries with high temperature (2017 alloy).
Typical grade: 2011 alloy, aluminum free-cutting alloy, good machinability and high strength, but poor corrosion resistance. The 2014 alloy is used in the aerospace industry with high strength. The 2017 alloy is a little less strong than the 2014 alloy, but easier to machine. 2618 Alloy for aluminum plate forging. Superior high temperature strength but poor corrosion resistance. Pistons, rubber molding dies, general heat-resistant components. 2219 aluminum plate has high strength, good low temperature and high temperature characteristics, and excellent weldability, but poor corrosion resistance. Containers for cryogenic use, aerospace machines.
3 series: Al – Mn aluminum manganese alloy
Features: The aluminum alloy with manganese as the main alloying element cannot be strengthened by heat treatment, and has good corrosion resistance. It can also be called rust-proof aluminum. It has good welding performance and good plasticity. The disadvantage is that the strength is low, but it can be strengthened by cold work hardening. Coarse grains are easily generated during annealing.
Scope of application: seamless oil-guiding pipes (3003 alloy) used in aircraft, cans (3004 alloy).
4 series: Al – Si Al-Si alloy
Features: mainly silicon, not commonly used. Some 4-series alloys can be strengthened by heat treatment, but some 4-series alloys cannot be heat-treated.
Typical grade: 4032 has good heat resistance and abrasion resistance, and has a small thermal expansion coefficient. Piston, cylinder head. 4043 has less solidification and shrinkage, and it has a natural gray color after anodizing with sulfuric acid. Dissolving wires, building panels.
Series 5: Al – Mg Al-Mg alloys
Features: mainly magnesium. Good resistance performance, good welding performance, good fatigue strength, can not be strengthened by heat treatment, only cold working can improve the strength.
Applications: lawn mower handles, aircraft fuel tank conduits, body armor.
Typical grade: 5005 aluminum plate has the same strength as 3003 aluminum plate, good workability, weldability and corrosion resistance. Uses: interior and exterior for construction, vehicle interiors, ships interiors. 5052 aluminum plate is the most representative alloy of medium strength, with good corrosion resistance, weldability and formability, especially high fatigue strength and good seawater resistance. Uses: general sheet metal, ships, vehicles, construction, bottle caps, honeycomb panels. The 5652 aluminum plate limits the impurity elements of the 5052 aluminum plate and inhibits the separation of hydrogen peroxide. Other characteristics are the same as those of the 5052 hydrogen peroxide container.
6 series: Al – Mg – Si Al-Mg-Si alloy
Features: mainly magnesium and silicon. Mg2Si is the main strengthening phase and is currently the most widely used alloy. Medium strength, good corrosion resistance, good welding performance, good process performance (easy to extrude and form), and good oxidation and coloring performance.
Scope of application: The most widely used alloys, energy transfer tools (such as: car luggage racks, doors, windows, body, heat sinks, box shells).
Typical grades: 6063 and 6061 are used the most, and 6061 is mainly used for aircraft parts, camera parts, ship parts, valve parts, various hardware and electronic parts, etc. 6063, 6060, and 6463 have relatively low strength in the 6 series. 6262, 6005, 6082, and 6061 have relatively high strength in the 6 series.
7 series: Al – Mg – Zn – Cu Al-Mg-Zn-Cu alloy
Features: mainly zinc, with a small amount of magnesium and copper added, belonging to the aviation series, is an aluminum-magnesium-zinc-copper alloy, a heat-treatable alloy, a super-hard aluminum alloy, with good wear resistance and good weldability, but resistant to Corrosiveness is poor. Among them, the superhard aluminum alloy is close to the hardness of steel. The extrusion speed is slower than that of the 6 series alloy, and the welding performance is good.
Scope of application: aviation (airplane bearing components, landing gear), rockets, propellers, aerospace.
Typical grade: 7050 is used for medium and heavy plates, extrusions, free forgings and die forgings for aircraft structural parts. 7075 is used in the manufacture of aircraft structural parts, high-stress structural parts with high strength and strong corrosion resistance, and mold manufacturing.
