A 6-series aluminum alloy with high formability and high surface quality and a preparation method thereof

By controlling the composition and texture of aluminum alloys through specific components and processes, the trade-off between formability and surface quality in existing technologies has been resolved, resulting in aluminum alloy sheets with high formability and high surface quality, suitable for automotive parts.

CN117626064BActive Publication Date: 2026-08-04CHINALCO MATERIALS APPL RES INST CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINALCO MATERIALS APPL RES INST CO LTD
Filing Date
2023-11-22
Publication Date
2026-08-04

AI Technical Summary

Technical Problem

Existing technologies often involve performance trade-offs in improving the formability and surface quality of aluminum alloys, making it difficult to achieve high formability and high surface quality without sacrificing other key properties.

Method used

Specific components and processes are employed, including a composition ratio of Si 1.1-1.5%, Fe 0.05-0.3%, Mg 0.2-0.5%, Mn 0.05-0.2%, Cu≤0.1%, and Ti≤0.1wt.%. The texture components and grain distribution are controlled through steps such as homogenization heat treatment, hot rolling, single cold rolling, continuous intermediate annealing, and solution treatment.

Benefits of technology

It achieves high formability and high surface quality of aluminum alloys, meeting the application requirements of automotive parts, especially door inner panels and tailgate inner panels, and has good production efficiency and cost-effectiveness.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a 6-series aluminum alloy with high forming and high surface quality and a preparation method thereof. The 6-series aluminum alloy comprises the following components and the mass percentage of each component is as follows: Si 1.1-1.5%, Fe 0.05-0.3%, Mg 0.2-0.5%, Mn 0.05-0.2%, Cu <=0.1%, Ti <=0.1wt.%, and the balance of Al and inevitable impurities, wherein, Mg / Si = 0.15-0.4, Mg+Si = 1.3-2%. The preparation method comprises the following steps: homogenization heat treatment of ingot, multi-pass hot rolling and cold rolling process, and on-line continuous annealing and solid solution treatment. By adopting the components and the process, the T4P plate can have good formability, meanwhile, high surface quality can be obtained, and the plate is suitable for automobile aluminum alloy plate, especially suitable for automobile inner plate with high forming performance requirement and exposed surface.
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