ALUMINUM ALLOY SHEET FOR ALUMINUM BOTTLE CAN BARREL HAVING EXCELLENT CAN ROUNDNESS AND ITS PRODUCTION METHOD

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 0.3 μm 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 ≥3 μm 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