MANUFACTURE OF HIGH STRENGTH ALUMINUM ALLOY SHEET FOR FORMING SMALL IN ANISOTROPY

摘要

PURPOSE: To manufacture the objective high strength Al alloy sheet small in anisotropy and excellent in formability by subjecting the ingot of an Al alloy having a specified compsn. to soaking treatment and thereafter executing hot rolling and cold rolling under specified temp. conditions and drafts. ;CONSTITUTION: The ingot of an Al alloy having a compsn. constituted of, by weight, 0.6 to 1.7% Mn, 0.8 to 2.0% Mg, 0.10 to 0.50% Cu, 0.10 to 0.50% Si, 0.20 to 0.70% Fe, 0.01 to 0.05% Ti and 0.0001 to 0.0010% B, and the balance Al with 0.15% impurities is heated at 600 to 640°C for ≥1hr and is subjected to soaking treatment. After that, it is subjected to hot rolling, and the hot rolling is completed at 280 to 350°C. Next, it is subjected to imtermediate cold rolling at 20 to 80% reduction rate of sheet thickness and cold rolling constituted of final cold rolling at 30 to 87.5% reduction rate of sheet thickness to regulate the total reduction area of sheet thickness by the cold rolling to ≤90%. In the process of this cold rolling, a heating stage so as to regulate the temp. of the A sheet to 110 to 230°C is executed at least for one time.;COPYRIGHT: (C)1994,JPO&Japio