Aluminum alloy sheet excelling in formability, and method of...

C - Chemistry – Metallurgy – 22 – C

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C22C 21/08 (2006.01) B21B 1/40 (2006.01) B21D 1/05 (2006.01) C22B 7/00 (2006.01) C22C 21/06 (2006.01) C22F 1/047 (2006.01)

Patent

CA 2108214

ABSTRACT OF THE DISCLOSURE An aluminum alloy sheet which has a high level of strength and excels in formability consisting essentially of about 3 to 10 wt% of Mg and a total of about 0.3 to 2.0 wt% of Fe and Si, the aluminum alloy sheet being provided with a lubricant surface coating and having a sliding resistance of not more than about 0.11. It may also contain strengthening elements, such as Cu, Mn, Cr, Zr and Ti. The method comprises preparing an aluminum scrap containing a total of about 0.3 to 2.0 wt% of Fe and Si; melting and then adjusting the material composition so as to attain an Mg content of about 3 to 10 wt% or a composition further containing at least one of the elements Cu, Mn, Cr, Zr and Ti, each in the amount of 0.02 to 0.5 wt%; subjecting the material to casting, hot rolling, cold rolling and continuous annealing to obtain an aluminum alloy sheet having a tensile strength of about 31 kgf/mm2 or more; and applying a lubricant surface coating so as to impart a coefficient of friction of not more than about 0.11.

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