| 摘要 |
PROBLEM TO BE SOLVED: To obtain a hot rolled aluminum alloy sheet having excellent balance between strength and elongation and also excellent fatigue strength. SOLUTION: An aluminum alloy ingot containing 2.2 to <3.0% Mg, 0.2 to 1.0% Mn, 0.05 to 0.25% Fe, 0.02 to 0.2% Si, and the balance inevitable impurities is subjected to homogenization treatment at 460 to 520°C and is thereafter subjected to hot rolling with a rolling end temperature of 240 to 260°C and thereby the proof strength in a rolling direction is set to≥180 MPa, the elongation to≥14%, and the fatigue strength at 10<SP>7</SP>cycles to≥120 MPa. COPYRIGHT: (C)2007,JPO&INPIT
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