Patent ID: 8366846

Claim:
An Al—Mg—Si aluminum alloy sheet comprising, in mass %: Mg: 0.4 to 1.0%; Si: 0.4 to 1.5%; Mn: 0.01 to 0.5%; Cu: 0.001% to 1.0%; and a remainder comprising Al and inevitable impurities, wherein, when an average area ratio of Cube orientation, which is a texture in a surface of the alloy sheet, in a rectangular region of 500 μm in an arbitrary widthwise rolling direction×2000 μm in an arbitrary lengthwise rolling direction is W, with respective Cube orientation average area ratios in ten rectangular regions each having the same area successively adjacent to each other in the widthwise rolling direction in the rectangular region are W1 to W10, a minimum Cube orientation average area ratio among Cube orientation average area ratios W1 to W10 is Wmin, and a maximum Cube orientation average area ratio among the Cube orientation average area ratios W1 to W10 is Wmax, the minimum Cube orientation average area ratio, Wmin, is set to 2% or more, and a difference, Wmax−Wmin, between the maximum Cube orientation average area ratio, Wmax, and the minimum Cube orientation average area ratio, Wmin, is set to 10% or less.