ALUMINUM ALLOY SHEET FOR FORMING, AND METHOD FOR PRODUCING ALUMINUM ALLOY SHEET FOR FORMING

摘要

PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet for forming, in which a performance balance that baking hardenability is excellent, and change over time at normal temperature is small after production, can be optimally constructed, and to provide a method for producing the same.;SOLUTION: An aluminum alloy rolled sheet composed of an Al-Mg-Si-based or Al-Mg-Si-Cu-based alloy is subjected to artificial preliminary aging treatment, so as to control the quantity and quality of a cluster II to suitable levels, thus the 0.2% proof stress of the material is beforehand controlled to ≥140 MPa, the material is subjected to 2% stretching in an aging period at ordinary temperature (0 to 45°C) at least within three months, and, after coating/baking at 170°C×20 min, 0.2% proof stress is ≥240 MPa, and particularly high coating/baking strength in which the degree of increase by the coating/baking is ≥80 MPa can be achieved.;COPYRIGHT: (C)2009,JPO&INPIT