| 摘要 |
PROBLEM TO BE SOLVED: To obtain an aluminum alloy sheet having excellent ductility and satisfactory truncated cone bulging formability. SOLUTION: An aluminum ingot containing 2.2 to <3.0% Mg, 0.2 to 1.0% Mn, 0.05 to 0.25% Fe and 0.02 to 0.2% Si, and the balance inevitable impurities is subjected to homogenizing treatment, and is thereafter subjected to hot rolling where the rolling ratio in the final pass is 30 to 60%, and rolling finishing temperature is 300 to 340°C, thus, in the cross-section in the sheet thickness-rolling direction, the crystal grain size in the sheet thickness direction is controlled to≤50 microns, and elongation in the rolling direction is controlled to≥20%. COPYRIGHT: (C)2007,JPO&INPIT
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