Showa Aluminum Corporation

Ryosuke Shimao

Ichizo Tsukuda

Kyohei Taguchi

Kazuo Kimura

An Al&mdash;Mg&mdash;Si series alloy ingot consisting essentially of Si:0.2-0.8 wt %, Mg:0.3-0.9 wt %, Fe:0.35 wt % or less, Cu:0.20 wt % or less and the balance of aluminum and inevitable impurities is prepared. The alloy ingot is homogenized, then subjected to rough hot rolling and finish hot rolling, and finally to cold rolling. One of the rough hot rolling is controlled such that material temperature immediately before one of the rough hot rolling is from 350 to 440&deg; C., cooling rate between one of the rough hot rolling and rough hot rolling subsequent thereto is 50&deg; C./min or more, material temperature immediately after one of the rough hot rolling is from 250 to 340&deg; C. and plate thickness immediately after one of the rough hot rolling is 10 mm or less. The cold rolling is controlled such that rolling reduction is 30% or more.

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Osaka, Japan

Ryosuke Shimao