High-strength aluminum alloy slab and manufacturing method thereof

Abstract

The invention relates to a high-strength aluminum alloy slab and a manufacturing method thereof. The alloy mainly comprises the following components: less than 0.35% of Si, less than 0.45% of Fe, 1.25-1.95% of Cu, less than 0.30% of Mn, 2.25-2.85% of Mg, 0.19-0.27% of Cr, 5.2-6.0% of Zn, less than 0.2% of Ti, less than 0.04% of Zr and the balance of Al and unavoidable elements. The manufacturing method of the high-strength aluminum alloy slab is free of a rolling process and comprises the following flows: proportioning raw materials, smelting, casting a flat ingot, carrying out two-stage soaking, sawing the head and bottom of the flat ingot, carrying out fixed-length sawing and width-fixed sawing, sawing upper and lower surfaces of the flat ingot, sawing the flat ingot into the aluminum plate according to requirements, carrying out solid solution quenching, stretching and flattening and carrying out aging treatment. By the manufacturing method, the production process flows can be shortened, such problems of the slab manufactured by a hot rolling method as uneven microstructure and performance, poor flatness and uneven thickness are solved, the yield is increased, the cost of the product is decreased and the economic benefits are increased.

Description

technical field [0001] The invention relates to a processing method of an aluminum alloy plate, in particular to a high-strength aluminum alloy thick plate and a manufacturing method thereof. Background technique [0002] 7XXX series high-strength aluminum alloys have high comprehensive performance and are widely used in the fields of aviation, aerospace, transportation and mold manufacturing. At present, 7XXX series high-strength aluminum alloy thick plates are produced by hot rolling, and the typical process flow is: batching → melting → slab casting → slab homogenization treatment → sawing head and tail → slab milling → heating → hot rolling → solution quenching → stretching → aging → sawing. [0003] Chinese patent CN101037747A discloses an aluminum alloy pre-stretched sheet for aviation and its production method. The process flow is: batching→casting→soaking treatment→heating, hot rolling and shearing→quenching→straightening→pre-stretching→aging → Sawing. The sect...

AI Technical Summary

Problems solved by technology

[0009] In view of the above problems of hot-rolled thick plates, the purpose of the present invention is to provide a high-strength aluminum alloy thick plate manufactured by a non-pressing processing method without rolling and its manufacturing method, which can shorten the production process and solve the problem of heat Problems of uneven structure, properties, bad shape and uneven thickness of rolled thick plates can improve yield, reduce product cost and increase economic benefits