6082 aluminium alloy thick-wall pipe production technology

Abstract

The invention belongs to the field of aluminium alloy profile production, and relates to a 6082 aluminium alloy thick-wall pipe production technology. Aluminium alloy comprises the elements in percentage by weight: 1.19-1.24% of Si, 0.94-0.99% of Mg, 0.2-0.4% of Cu, 0.84-0.89% of Mn, 0.13-0.18% of Cr, 0.11-0.18% of Ti, 0.19-0.24% of Fe, less than or equal to 0.05% of Zn, less than or equal to 0.03% of other single impurities, less than or equal to 0.10% of total impurities and the balance of Al, wherein in an aluminium alloy thick-wall pipe water cooling process, liquid nitrogen is sprayed onto the portion, from an extruder outlet to a water cooling sink inlet, on the periphery of an aluminium alloy thick-wall pipe, artificial aging of the aluminium alloy thick-wall pipe subjected to tension leveling at 150+ / -5 DEG C is 10 h, artificial aging at 200+ / -5 DEG C is 2 h, by reasonably choosing extrusion technology parameters and heat processing technology parameters, not only is the surface quality of the 6082 alloy profile improved, but also the percentage elongation (higher than 10%) after fracture and the corrosion resistance performance of the 6082 alloy are improved, so that a product meets the requirements.

Description

technical field [0001] The invention belongs to the field of aluminum alloy profile manufacture and relates to a production process of 6082 aluminum alloy thick-walled pipe. Background technique [0002] 6xxx series alloys are the most important press-worked alloys in wrought aluminum alloys. They are aluminum alloys with magnesium and silicon as the main alloying elements. The main strengthening phase is the intermetallic compound Mg formed by magnesium and silicon. 2 Si is an aluminum alloy that can be strengthened by heat treatment. 6xxx series alloys have medium strength, good plasticity, excellent weldability and corrosion resistance, and no tendency to stress corrosion cracking. Therefore, 6xxx series alloys are the most widely used aluminum alloys in the world. 6082 aluminum alloy is the main alloy member in 6xxx alloy. 6082 belongs to Al-Mg-Si series heat treatment can strengthen aluminum alloy. It has good formability, weldability and machinability, and has medium...

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Problems solved by technology

[0004] In view of this, the present invention provides a 6082 aluminum alloy thick-walled pipe production process in order to solve the problem that the mechanical properties and elongation after fracture of the 6082 aluminum alloy thick-walled pipe prepared by the existing production process cannot meet the production requirements. The extrusion process parameters and heat treatment process parameters in the production process of 6082 aluminum alloy thick-walled pipes can improve the elongation after fracture (greater than 10%) and corrosion resistance of 6082 alloys while improving the surface quality of 6082 alloy profiles, and finally make the prepared 6082 aluminum alloy thick-walled pipe products meet production requirements

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