Aluminum alloy sheet for can body and method for manufacturing the same

By controlling the Fe/Si mass ratio and adding rare earth elements to modify oxide inclusions, the distribution of intermetallic compounds and inclusions was regulated, solving the problems of strength decay and high risk of perforation in aluminum alloy sheets after baking, and realizing the preparation of low-cost, high-performance aluminum alloy sheets.

CN116949321BActive Publication Date: 2026-07-17BAOSHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BAOSHAN IRON & STEEL CO LTD
Filing Date
2022-04-19
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing aluminum can materials suffer from strength degradation after baking, resulting in a high risk of perforation. Furthermore, the introduction of impurity elements into recycled aluminum materials increases the difficulty of material utilization, making it challenging to achieve low-cost and high-performance aluminum alloy sheet preparation.

Method used

Aluminum alloy plates were prepared using homologous recycled materials, with the Fe/Si mass ratio controlled to be greater than 1.5. Trace amounts of rare earth elements were added to modify oxide inclusions, and the size distribution of intermetallic compounds and inclusions was regulated. Stress concentration was reduced by refining the grains and controlling the proportion of the second phase. An Al-Ti-B modifier was added during the preparation process to refine the grains.

Benefits of technology

It significantly reduces the incidence of perforation defects in aluminum alloy sheets, improves the corrosion resistance and formability of the material, reduces raw material costs, and enables the production of low-cost, high-performance aluminum alloy sheets.

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Abstract

The application discloses a kind of aluminium alloy sheet for can body and its preparation method. By optimizing the proportion of main alloy elements Mn, Mg, Fe, Si and accurately controlling the distribution of intermetallic compounds, the incidence of piercing is effectively reduced. The utilization rate of the product is ≥50% compared with the same system of recycled materials, and it has unique genetic organizational characteristics: the loose area ratio of the low-power section of the ingot before homogenization is 0.05-0.18%, and there is no large-size second phase above 70 μm. The conversion rate of AlFeMnSi phase after homogenization is 80-95%. On the longitudinal section of the finished aluminum alloy sheet for can body, the total area ratio of AlFeMnSi intermetallic compounds and inclusions above 5 μm is 0.08%-0.80%.
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