| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet for blind, excellent in manufacturability, formability of radius shape, and retentivity of radius shape. SOLUTION: The Al alloy sheet comprises, by weight, 1.5-2.4% Mg, 0.10-0.25% Mn, <=0.20% Cu, <=0.30% Fe, <=0.20% Si, further either or both of 0.01-0.10% Cr and 0.001-0.05% Ti, and the balance Al with inevitable impurities. Moreover, the area ratio of Al-Mn crystallized substances in the plane perpendicular to a rolling direction is <=1.0% and the number of those having >=1μm diameter is <=1500 pieces/mm2, the area ratio of Mg2Si crystallized substances is <=0.8%, the number of those having >=1μm diameter is <=2000 pieces/mm2, and tensile strength in a rolling direction is regulated to >=270 MPa.
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