| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet required for producing an aluminum bottle can barrel in which defects in necking forming are reduced, and can shape (roundness) after necking forming is satisfactory. SOLUTION: The aspect ratio (the length in the rolling direction)/(the length in the sheet thickness direction) in the crystal grains of an Al-Mn-Mg-Cu alloy sheet having a specified composition is controlled to 10 to 30, the area ratio of intermetallic compounds with a size satisfying a diameter equivalent to a circle of 0.1 to <0.3μm is controlled to 0.3 to 0.8%, also, the area ratio of intermetallic compounds with a size satisfying a diameter equivalent to a circle of≥3μm is controlled to 0.3 to 0.5%, and, the anisotropy in material strength in the case a test piece is extracted from the side wall part of a bottle-shaped formed body is controlled to≤5%. In its production method, a cast ingot is subjected to homogenizing treatment, and thereafter, the temperature conditions of hot rolling, the spraying conditions of rolling oil and the like are controlled to specified ranges. COPYRIGHT: (C)2007,JPO&INPIT
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