MANUFACTURING METHOD OF ALUMINUM ALLOY SHEET FOR BEVERAGE CAN BODY EXCELLENT IN ANISOTROPY AND NECK MOLDABILITY AND BOTTLE CAN BODY EXCELLENT IN ANISOTROPY AND BOTTLE NECK MOLDABILITY

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing method of an aluminum alloy sheet for a beverage can body excellent in anisotropy and neck moldability.;SOLUTION: The invention include conducting a homogenization treatment on an ingot obtained by smelting an aluminum alloy containing, by mass%, Si, Fe, Cu, Mn, Mg of defined amounts and semi-continuously casing the same at 555 to 605°C for 4 to 10 hours, conducting a heat treatment at 500 to 555°C for 1 hour or longer, then conducting hot rough rolling at an outlet side temperature of 400 to 460°C, hot finishing rolling under a condition of at a first path outlet side temperature of 380°C or less, a second path outlet side temperature of 340°C or less and a third path outlet side temperature of 250 to 310°C and then conducting first cold rolling with rolling reduction rate of 10 to 20%, a first intermediate annealing under a condition of a retention temperature of 460 to 540°C and retention time of 5 to 60 sec. by using a continuous annealing device, and conducting a second cold rolling with rolling reduction rate of 80 to 95% to obtain an aluminum alloy sheet having sheet thickness of 0.210 to 0.47 mm and bearing force after galling of 230 to 320 N/mm².;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT