What are the different series of aluminum?

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The 1XXX series is formed by adding a small amount of copper to pure aluminum. It has excellent forming characteristics, high corrosion resistance, good weldability and conductivity. 1XXX series aluminum alloys are widely used in products that do not require high strength, such as chemical equipment, thin-sheet processing parts, deep-drawn or spinning concave vessels, welding parts, heat exchangers, clock surfaces and disk surfaces, nameplates, kitchenware, decorations , Reflective appliances, etc. The widely used grades of 1XXX pure aluminum: 1050, 1060, 1070, 1100.

The 2XXX series is a typical hard aluminum alloy in the aluminum-copper-magnesium series, with reasonable composition and good overall performance. Many countries produce this alloy, which is the largest in duralumin. The characteristics of the alloy are: high strength, a certain degree of heat resistance, and can be used as working parts below 150°C. At temperatures higher than 125°C, the strength of 2XXX series alloys is higher than that of 7075 alloys. The forming properties in the hot state, annealing and new quenching state are better, and the heat treatment strengthening effect is significant, but the heat treatment process is strict. The corrosion resistance is poor, but it can be effectively protected by covering with pure aluminum; it is easy to produce cracks during welding, but it can be welded or riveted by special technology. Widely used in aircraft structures, rivets, truck wheels, propeller components and other various structural parts. To Use of 2XXX series aluminum copper alloy    

2XXX series aluminum-copper alloys are widely used in aircraft structures due to their high strength and good fatigue strength, especially where the wings and fuselage structures are under tension.

To 2XXX series duralumin is widely used in brands: 2024 (2A12), LY12, LY11, 2A11, 2A14 (LD10), 2017, 2A17, etc. 

3XXX series is AL-Mn series alloy, which is the most widely used anti-rust aluminum. The strength of this alloy is not high (slightly higher than industrial pure aluminum) and cannot be strengthened by heat treatment, so cold working methods are used to improve its mechanical properties : High plasticity in the annealed state, good plasticity during semi-cold work hardening, low plasticity during cold work hardening, good corrosion resistance, good weldability, and poor machinability. Uses are mainly used for low-load parts that require high plasticity and good weldability, working in liquid or gaseous media, such as mailboxes, gasoline or lubricating oil pipes, various liquid containers and other low-load parts made by deep drawing: Wire used to make rivets 3XXX series aluminum plates have good formability, weldability and corrosion resistance. Used for processing parts that require good formability, high corrosion resistance and good weldability, or work that requires these properties and higher strength than 1XXX series alloys, such as kitchenware, food and chemical product processing and Storage devices, tanks and tanks for transporting liquid products, various pressure vessels and pipes made of thin plates, general utensils, heat sinks, makeup boards, photocopier drums, and ship materials.

The 5XXX series is a high-magnesium alloy (5A06 (LF6) 5A05 (LF5)), which has good strength, corrosion resistance and machinability in non-heat-treatable alloys. The surface is beautiful after anodization. The arc welding performance is good. The 5XXX series alloy The main alloying element is magnesium, which has good corrosion resistance, weldability and medium strength. The excellent corrosion resistance makes 5XXX series alloys widely used in marine applications such as ships, automobiles, aircraft welding parts, and subway light rails. Fire-proof pressure vessels (such as liquid tankers, refrigerated trucks, refrigerated containers), refrigeration equipment, TV towers, drilling equipment, transportation equipment, missile parts, armor, etc. 

The 5XXX series belong to Al-Mg-Si series alloys (5083 "LF4", 5754, 5052), and have a wide range of applications. Especially the construction industry cannot do without this alloy. It is the most promising alloy. Good corrosion resistance, excellent weldability, good cold workability, and medium strength. The main alloying element of the 5XXX series is magnesium, which has good forming performance, corrosion resistance, weldability, and medium strength. It is used to manufacture aircraft fuel tanks, oil pipes, and sheet metal parts of transportation vehicles and ships, meters, street lamp brackets and rivets , Hardware products, electrical enclosures, etc. ③ AL-Mn series alloy is the most widely used anti-rust aluminum. This alloy has high strength, especially fatigue resistance: high plasticity and corrosion resistance, and cannot be strengthened by heat treatment. It is hardened by semi-cold work. Good plasticity, low plasticity during cold work hardening, good corrosion resistance, good weldability, poor machinability, and polishing. Uses are mainly used for low-load parts that require high plasticity and good weldability, working in liquid or gaseous media, such as mailboxes, gasoline or lubricating oil pipes, various liquid containers and other low-load parts made by deep drawing: Wire is used to make rivets. To 5XXX aluminum-magnesium alloys are widely used grades: 5A06, 5A05, 5083, 5754, 5052, 5005, 5086, 5182, etc. 

The 6XXX series are heat-treatable alloys that have good formability, weldability, machinability, and medium strength. They can still maintain good operability after annealing. The main alloying elements of   

6XXX series alloys are magnesium and silicon AlMgSi1Cu, and form Mg2Si phase. If it contains a certain amount of manganese and chromium, it can neutralize the bad effects of iron; sometimes a small amount of copper or zinc is added to improve the strength of the alloy without significantly reducing its corrosion resistance; there is a small amount of conductive materials In order to offset the adverse effects of titanium and iron on conductivity; zirconium or titanium can refine the grain and control the recrystallization structure; in order to improve the machinability, lead and bismuth can be added. Mg2Si is solid-dissolved in aluminum, making the alloy have artificial age hardening function. 6061-T651 is the main alloy in the 6XXX series alloy. It is a high-quality aluminum alloy product produced by heat treatment and pre-stretching process. Although its strength cannot be compared with the 2XXX series or 7XXX series, its magnesium and silicon alloys have many characteristics and can be processed. Excellent performance, excellent welding characteristics and electroplating, good corrosion resistance, high toughness and no deformation after processing, compact material without defects and easy polishing, easy color film, excellent oxidation effect, etc.

7000 aluminum alloy is another commonly used alloy with many varieties. It contains zinc and magnesium. Among the more common aluminum alloys, the best strength is 7075 alloy, but it cannot be welded, and its corrosion resistance is quite poor. Many parts made by CNC cutting use 7075 alloy. Zinc is the main alloying element in this series, and a little magnesium alloy can make the material can be heat treated to achieve very high strength characteristics. This series of materials generally contain a small amount of copper, chromium and other alloys. Among them, the No. 7075 aluminum alloy is especially top-grade, with the highest strength, suitable for flying mechanism frames and high-strength accessories.   

7075 belongs to the Al-Zn-Mg-Cu series of super-duralumin. This alloy is an ultra-high-strength deformed aluminum alloy that has been used in the aircraft industry in the late 1940s and is still widely used in the aviation industry. It is characterized by good plasticity after solution treatment, particularly good heat treatment strengthening effect, high strength below 150 ℃, and particularly good low temperature strength; poor welding performance; stress corrosion cracking tendency; need to be coated with aluminum or other Protection processing use. Two-stage aging can improve the alloy's ability to resist stress corrosion cracking. The plasticity in the annealed and just-quenched state is slightly lower than 2A12 in the same state and slightly better than 7A04. The static fatigue and notch sensitivity of the sheet are better than 7A04.


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