Method for producing aluminum can sheet

The method addresses earing issues in aluminum can sheet production by using a single stand reversing mill with controlled hot rolling and two-stage cold rolling, achieving desirable earing characteristics and strength for efficient production of thin-walled cans.

EP3956489B2Active Publication Date: 2026-05-27HELLENIC RES CENT FOR METALS SA
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Patents
Current Assignee / Owner
HELLENIC RES CENT FOR METALS SA
Filing Date
2021-03-01
Publication Date
2026-05-27

AI Technical Summary

Technical Problem

Existing methods for producing aluminum can sheet result in undesirable earing, which causes transport issues and insufficient trim during the deep drawing and ironing processes, and are often limited by the capabilities of single stand reversing mills, especially when producing thinner gauges.

Method used

A method involving hot rolling with a single stand reversing mill to avoid recrystallization, followed by two-stage cold rolling with intermediate annealing, to achieve favorable earing characteristics and strength, allowing production of thinner gauges economically.

Benefits of technology

The method reduces high 0°/90° earing, enhances 45° earing orientation, and increases production efficiency by overcoming limitations of single stand reversing mills, enabling production of stable cans with thin wall thickness.

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Abstract

A method for producing aluminum can sheet comprises the following steps: providing a body made of an aluminum alloy type AA3004, AA3104 or other aluminum alloy suitable for making aluminum can sheet; heating the body to a homogenization temperature; hot rolling said body in a hot rolling mill to produce a hot rolled sheet, said hot rolled sheet exiting the hot rolling mill at a hot rolling exit temperature with a hot mill exit gauge, wherein the hot rolling exit temperature is selected to substantially avoid recrystallization of the hot rolled sheet; cold rolling the hot rolled sheet in a cold rolling mill to apply a cold reduction to produce a cold rolled sheet with a cold mill exit gauge smaller than the hot mill exit gauge; annealing the cold rolled sheet in an intermediate temperature range selected to allow recrystallization of the cold rolled sheet to obtain a recrystallized annealed sheet; cold rolling the recrystallized annealed sheet to apply a cold reduction to produce a cold rolled sheet with a final gauge.
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