| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet which has excellent bending workability capable of flatting hem working, has excellent hardenability in coating/baking, and further has excellent corrosion resistance, and to provide a production method thereof. SOLUTION: The aluminum alloy sheet comprises 0.5 to 2.0% Si and 0.2 to 1.5% Mg, satisfying 0.7Si%+Mg%≤2.2% and Si%-0.58Mg%≥0.1, and the balance Al with impurities. Alternatively, the aluminum alloy sheet comprises one or more kinds of metals selected from≤0.5% Zn,≤1.0% Cu,≤1.0% Mn,≤0.3% Cr,≤0.2% V,≤0.2% Zr,≤0.1% Ti and≤50 ppm B in addition to the composition of the above aluminum alloy. The aluminum alloy sheet has the characteristics that the anisotropy in Lankford value is >0.4. A cast ingot is homogenized at a treatment of≥450°C, is thereafter cooled to a prescribed temperature of <350°C at a cooling rate of≥100°C/h, and is hot-rolled at the same prescribed temperature. The sheet is further cold-rolled, and is subsequently solution-treated and quenched at≥500°C, so that the aluminum alloy sheet is produced. COPYRIGHT: (C)2004,JPO
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