Production and heat treatment method of aluminum alloy continuous-casting continuous-rolling billet

Abstract

The present invention belongs to the technical field of non-ferrous metal processing, and particularly relates to a production and heat treatment method of a 5052 aluminum alloy continuous-casting continuous-rolling billet. The production and heat treatment method comprises steps such as smelting, continuous casting, continuous rolling, coiling and heat treatment, and is characterized in that the Hazelett continuous-casting continuous-rolling process is used after the smelting, and the smelting step comprises three refining and concretely comprises material preparing, aluminum alloy liquid smelting, first refining, slag skimming, alloy element adding, second refining, alloy component adjusting, third refining, degassing filtration, and standing. With the production and heat treatment method of the present invention, the key technology that the Hazelett process is adopted to produce the 5052 aluminum alloy plate material and perform the heat treatment is solved, the blank of the production process is filled up, and the high economic benefits and the high practical values are provided.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal processing, and in particular relates to the production and heat treatment method of 5052 aluminum alloy continuous casting and rolling slabs. Background technique [0002] 5052 alloy is an Al-Mg series non-strengthenable antirust aluminum alloy with heat treatment. It has good formability, weldability, medium strength and other characteristics, and is widely used in national defense and civilian fields. It is often used as interior decoration of automobiles, bottle caps, aircraft fuel tanks, instruments, various container aluminum alloy sheets, building decoration materials such as shutters, etc. With the development of related industries, the demand for 5052 aluminum alloy sheets will increase. [0003] At present, the production of 5052 alloy plates at home and abroad is still mainly produced by hot rolling for billets, and the technology is very mature. , but this method has the dis...

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Problems solved by technology

[0003] At present, the production of 5052 alloy plates at home and abroad is still mainly produced by hot rolling for billets, and the technology is very mature. , but this method has the disadvantages of long process flow, long production cycle, high cost and high energy consumption; some enterprises also try to produce 5052 aluminum alloy plates by casting and rolling, which has low cost and low cost compared with ingot hot rolling. Short process, environmental protection and other advantages, but the surface quality and composition segregation of continuous casting and rolling billets are prone to problems, which affect the performance of its final cold-rolled products; continuous casting and rolling is a combination of continuous casting and continuous rolling. The advanced rolling process, the equipment used is the Hazlett continuous casting and rolling mill in the United States. First, the aluminum alloy liquid is injected into the continuous casting machine to cast the billet, and then it is directly rolled by the three-continuous rolling mill, which can produce 2.0mm The above continuous casting and rolling slabs, this process is also called Hazlett process, compared with the traditional production process of first casting and then heating and rolling and continuous casting and rolling, it saves the casting of large slabs and the sawing of ingots. Face milling and reheating, large processing volume roughing mill billet rolling and other links, the structure characteristics of the aluminum strip produced by this process are also between casting and semi-continuous casting, and the product performance is better than continuous casting and rolling plate, but slightly worse than hot-rolled plate

However, compared with the other two processes, the Hazlet process saves energy, reduces consumption, and saves costs, and has obvious economic and social benefits; at present, the Hazlet process is rarely used in my country, and the production technology is not yet mature. Complicated alloys and wider plates and strips are difficult, and casting defects such as surface segregation and holes are easy to form during continuous casting. Therefore, the subcutaneous inclusions on the upper surface of the strip produced will affect the surface quality of the product, especially the continuous casting and rolling production of 5052 Aluminum alloy hot-rolled sheet has typical deformation texture and strong β-fiber rolling texture, annealing treatment and cold rolling can strongly affect the mechanical properties of aluminum alloy

At present, the production process of 5052 alloy by Hazlett process in China is not yet mature, and there is also a lack of comprehensive analysis and research on its structure characteristics, performance changes and stability, which is not conducive to the optimization of the production process and the improvement of product quality.

The development of this process has been greatly restricted

[0004] In summary, the development of a method for the production and heat treatment of 5052 aluminum alloy continuous casting and rolling slabs will not only change the immaturity and instability of the current domestic production of 5052 aluminum alloy strips using the Hazelett process, but also make cold rolling The mechanical properties of the finished sheet meet the requirements of use, and at the same time provide the necessary technical reserves for the large-scale production of 5052 alloy sheets in the future, which has important theoretical significance and production practical value; There are not many manufacturers, and most manufacturers lack the understanding of the Hazlet production line, so it is very meaningful to study the Hazlet process and heat treatment method for this process to produce aluminum strips and foils

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