PRODUCTION OF AL ALLOY SHEET FOR PACKAGING

PURPOSE:To produce an Al alloy sheet having excellent deep drawing and redrawing properties, by subjecting an ingot of the Al alloy contg. Mg, Mn and other alloy elements to a soaking treatment then to hot rolling and intermediate annealing followed by finish cold rolling at a specific reduction ratio. CONSTITUTION:The ingot of the Al alloy which contains, by weight %, 1-6% Mg and 0.1-2% Mn as essential components, contains =480 deg.C and is then hot rolled to 2-6mm thickness. The steel is then subjected to cold rolling and intermediate annealing at 300-600 deg.C at need then to finish cold rolling to about 0.3mm thickness at 30-80% reduction ratio. The Al alloy sheet for packaging in which the occupying area rate of the intermetallic compd. in >=0.5mum dimensional range viewed from the surface of the rolled sheet is 3.5% and which has the excellent deep drawing and redrawing properties is produced.