| 摘要 |
PURPOSE:To manufacture an Al-alloy rolled plate for forming combining superior formability with high strength, by applying specific heat treatments to an Al-alloy ingot having a specific composition consisting of Si, Mg, Fe, and Al and the hot-rolled plate of the above. CONSTITUTION:The Al-alloy ingot consisting of, by weight, 0.4-2.5% Si, 0.1-0.4% (in case of 0.4-1.0% Si) or 0.1-0.25% (in case of 1.0-2.5% Si) Mg, 0.05-0.4% Fe, and the balance Al with inevitable impurities and further containing, if necessary, one or more kinds among 0.05-0.6% Mn, 0.05-0.3% Cr, and 0.05-0.15% Zr or/and 0.10-1.5% Cu is subjected to homogenizing treatment at 450-580 deg.C for 1-48hr. Subsequently, the ingot is rolled to the desired thickness and held at 500-580 deg.C for >=5sec. Succeedingly, the plate is rapidly cooled and then aged at room temp. In this way, the Al-alloy rolled plate excellent in bulge formability and bendability, free from occurrence of Luder's marks, and keeping strength even after subjected to baking finish can be obtained.
|
