Production method of 5754-H32 aluminum alloy plate strip

Abstract

The invention discloses a production method of a 5754-H32 aluminum alloy plate strip. The production method of the 5754-H32 aluminum alloy plate strip mainly comprises the following steps of: casting, saw cutting, face milling, heating, hot rolling, cold rolling, stabilizing annealing and fine adjusting. During the hot rolling step, hot rolled coil thickness is reserved to be 20%-35% of end product thickness, hot fine rolling final rolling temperature is 320 DEG C-350 DEG C, during the cold rolling step, end product thickness is achieved through one time of secondary cold rolling, and total working rate is 20-35%. For products with an end product thickness >=1.3mm, steps of removing hot rolling blanks to perform complete annealing and middle annealing process can be omitted, accordingly production process is shortened, and production cost is lowered.

Description

technical field [0001] The invention relates to the field of aluminum alloy manufacturing, in particular to a production method of 5754-H24 aluminum alloy plate and strip. Background technique [0002] 5754 aluminum alloy is a typical alloy in the Al-Mg series alloy, which has the characteristics of medium strength, good corrosion resistance and weldability, and easy processing and forming. 5754 aluminum alloy plates in different heat treatment states are widely used in welded structural parts, large roof panels, automobile manufacturing, rail transit and shipbuilding industries, among which H32 state plate strip is one of the most used heat treatment states. [0003] The performance control scope of 5754-H32 and 5754-H22 is as follows: [0004] control standard Rm / MPa Rp 0.2 / MPa A / % EN485-2:2008 220～270 ≥130 ≥10 [0005] At present, the conventional process flow of 5754-H32 is: melting and casting→sawing→face milling→heati...

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Problems solved by technology

[0006] In order to solve the problem of complex production process and high cost, H22 can be used instead of H32 process route. The process flow is: melting and casting→sawing→milling→heating→hot rolling→(full annealing)→cold rolling→finished product annealing→finishing→packaging

[0007] The performance of 5754 aluminum alloy is extremely sensitive to temperature changes when it is annealed between the recrystallization start temperature and the recrystallization end temperature. The range is different, which has a great impact on mass industrial production. It has high requirements for the temperature measurement accuracy and temperature uniformity of the annealing furnace, and the performance after annealing is often unqualified, resulting in low yield.

[0008] In addition, if the finishing temperature of hot rolling cannot be guaranteed to be above the complete recrystallization temperature, it will also cause different annealing temperatures to achieve performance, so that it cannot be annealed in parallel furnaces

In order to solve this problem, it is necessary to carry out complete annealing after hot rolling to ensure the uniform performance of the hot rolled billet, which increases the production cost

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