Method for the production of an aluminium alloy for the fabrication of drink can bodies with enhanced resistance to sidewall abuse

摘要

The invention concerns a method for making a strip designed for making bodies of drink cans, consisting in: producing an aluminium alloy containing (by weight) from 1.1 to 1.7 % of Mg, 1.2 to 1.6 % of Mn, 0.05 to 0.45 % of Si, 0.05 to 0.60 % of Fe, up to 0.40 % of Cu, up to 0.14 % of Cr, up to 0.08 % of Ti, other elements up to 0.07 % each and a total of 0.25 %, the rest being aluminium; treating said liquid alloy by injecting gas (preferably argon); casting between rolls a strip with a thickness less than 5 mm and preferably less than 4 mm, during which casting a mould dressing in applied on the rolls; homogenising the strip between 450 and 530 DEG C for a time interval ranging between 2 and 20 hours; cold rolling the strip in several passes; intermediate annealing between 300 and 400 DEG C for 1 to 12 hours; cold rolling in one or several passes until obtaining the final thickness. The method enables to obtain strips adapted for making bodies of cans having enhanced side wall resistance.