Six-series aluminum alloy sheet for outer plate of automotive body and preparation method thereof

Abstract

The invention belongs to the field of aluminum alloy sheets for automotive bodies, and relates to a six-series aluminum alloy sheet for an outer plate of an automotive body and a preparation method thereof. The six-series aluminum alloy sheet is prepared from the following elemental constituents according to weight percentages: 0.55 to 0.65 % of Si, 0.10 to 0.20% of Fe, 0.10 to 0.20% of Cu, 0.05 to 0.15% of Mn, 0.65 to 0.75% of Mg, 0. 01 to 0.03% of Ti, less than or equal to 0.03% of single impurity, less than or equal to 0.10% of impurities in total, and the balance being Al. According to thepreparation method of the six-series aluminum alloy sheet, the rolling pass and working procedure time of hot rough rolling are strictly limited, and annealing is performed two times in the cold rolling process. Compared with a traditional 6016 alloy, the finished product has the advantages that the edge covering performance is significantly improved, the finished product has a smooth and fine surface without macroscopic Roping line defects after stamping, and the surface quality is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy sheets for automobile bodies, and relates to a 6-series aluminum alloy sheet for automobile body outer panels and a preparation method thereof, in particular to a 6-series aluminum alloy sheet with excellent hemming performance and high surface quality after stamping and its preparation method. Background technique [0002] With the continuous growth of the number of cars in various countries in the world, fuel consumption and exhaust pollution are increasing day by day. Automakers have to make reducing fuel consumption and limiting vehicle exhaust emissions one of the important goals of automobile development. Lightweight body is an effective way to achieve this goal. Therefore, in recent years, the application of aluminum alloy as a lightweight material on the body has become more and more popular. [0003] At present, most of the research focus of patents on the outer panel of automobil...

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Problems solved by technology

[0005] In view of this, in order to solve the problem that the hemming performance and surface quality of the 6-series aluminum alloy sheet prepared by the existing process cannot meet the production requirements, which affects the large-scale application of the outer panel of the automobile body, an automobile body outer panel is provided. 6-series aluminum alloy plate for plate and preparation method thereof

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