MANUFACTURING METHOD OF ALUMINUM ALLOY SHEET FOR THIN WALL BEVERAGE CAN EXCELLENT IN MOLDABILITY AND ANISOTROPY

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of an aluminum alloy sheet for beverage can excellent in moldability and anisotropy.;SOLUTION: An aluminum alloy sheet having bearing force after coating and galling of 230 to 320 N/mm² by conducting a homogenization treatment on an aluminum alloy ingot containing, by mass%, Si, Fe, Cu, Mn, Mg of predetermined amounts, then hot finishing rolling with first path outlet side temperature of 380°C or less, second path outlet side temperature of 340°C and third path outlet side temperature of 240 to 300°C to obtain a hot finishing rolled sheet with sheet thickness of 2 to 4 mm, conducting first cold rolling with rolling reduction rate of 30 to 59%, first intermediate annealing under a condition of a holding temperature of 300 to 400°C and holding time of 5 to 30 sec. by using a continuous annealing device, second cold rolling with rolling reduction rate of 5 to 20%, batch annealing with holding temperature of 320 to 380°C and holding time of 2 to 6 hr. and final cold rolling with rolling reduction rate of 70 to 90% till the sheet thickness becomes 0.200 to 0.280 mm.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT