METHOD FOR PRODUCING ALUMINUM ALLOY SHEET FOR CAN BODY EXCELLENT IN RESISTANCE TO PINHOLE FRACTURE AND ALUMINUM ALLOY SHEET FOR CAN BODY

摘要

PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet for a can body, excellent in resistance to pinhole fracture, and a method for producing the same.SOLUTION: A method for obtaining an aluminum alloy sheet having a sheet thickness of 0.220 mm to 0.265 mm is provided in which an aluminum alloy ingot is hot-rolled and cold rolled into a rolled sheet having a predetermined sheet thickness, the rolled sheet is subjected to final intermediate annealing by continuous annealing thereby obtaining an intermediate sheet material, the intermediate sheet material is further cold rolled thereby obtaining the 0.220 mm to 0.265 mm thick aluminum alloy sheet. In the method, a cold rolling ratio after the final intermediate annealing is 30% or more, a coil temperature immediately after rolled by a final cold rolling pass is 80°C to 150°C, and a condition of the cold rolling after the final intermediate annealing satisfies FT≤515-6×CR (1), where CR: the cold rolling ratio (%) after the final intermediate annealing, FT: the coil temperature immediately after the final cold rolling pass (°C). A blank 5 is obtained by blanking the alloy sheet, and a cup- shaped can body 6, a cup-shaped can body 7, bottomed cylindrical can body 8 and a can body 10 are then sequentially obtained.