Thin-wall 6-series aluminum profile for rail transit vehicle body and preparation method thereof

Abstract

The invention belongs to the technical field of aluminum alloy manufacturing, and relates to a thin-wall 6- series aluminum profile for a rail transit vehicle body and a preparation method thereof. The aluminum alloy comprises the following components in percentage by weight, 0.5-0.65% of Si, less than or equal to 0.25% of Fe, less than or equal to 0.10% of Cu, 0.03-0.15% of Mn, 0.45-0.55% of Mg,less than or equal to 0.05% of Cr, less than or equal to 0.05% of Zn, less than or equal to 0.10% of Ti, less than or equal to 0.05% of a single impurity, less than or equal to 15% of total impuritiesand the balance Al. The temperature of the homogenization treatment is 550-580 DEG C, the content of elements such as Mn and Cr is reduced, the recrystallization temperature in the alloy extrusion process is reduced, the nucleation density and the proportion of recrystallization of the aluminum profile in the wall thickness direction during extrusion of the aluminum profile are increased, the characteristic that recrystallization is easy to occur when the thin-wall sectional materials are extruded is fully utilized, a product with the uniform and consistent surface layer core grain structureis obtained in the extrusion process, and the method for improving the recrystallization temperature of the alloy by increasing the content of Mn and Cr elements is subverted.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy manufacturing, and relates to a thin-walled 6-series aluminum profile for a rail transit vehicle body and a preparation method thereof, in particular to a chemical composition design for improving production efficiency and microstructure of a 6-series aluminum alloy thin-walled profile. Background technique [0002] With the development of lightweight in the field of transportation, aluminum alloys with advantages such as low density, high specific strength, good extrudability, weldability, strong corrosion resistance, and low processing costs have been widely used in the field of transportation, while With the further lightening of tools in the field of transportation, the requirements for further "thin-wall lightweight" weight reduction of components are increasing, especially in the field of rail transit, where vehicles generally use 6N01 or 6005A alloy large-section hollow thin-wall extr...

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Problems solved by technology

[0004] In view of this, in order to solve the problems that the thinner the product wall thickness is, the lower the extrusion efficiency is and the thicker the coarse crystal ring is in the existing technology of aluminum extrusion profiles for rail transit car bodies, the present invention provides an aluminum profile for rail transit car bodies. Extruded profile and method for its preparation

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