Method and installation for producing hot rolled aluminium tape intended for can making

Abstract

A process for producing hot-rolled aluminum strip for can making in a rolling plant whose yearly production capacity is below 250,000 tons. Feed material is fed through a reversing roughing stage to form a strip which immediately thereafter is finish rolled. The finish rolling is followed by heat treatment of the strip coiled up into coils. In this case, during the last finishing rolling passes, recrystallization in the rolled material is suppressed by means of controlled temperature management of the hot strip and the recrystallization is specifically brought about only outside the rolling train, directly following the finishing rolling.

1 . A process for producing hot-rolled aluminum strip for can making in a plant, comprising the steps of: 
 feeding a feed material into a reversing roughing stage to form a strip;    finish rolling the strip from a coil to a coil in a reversing roll stand immediately after the roughing stage in a number of hot rolling passes;    suppressing recrystallization of the rolled strip by controlled temperature management of the strip so that last of the hot rolling passes are carried out without recrystallization on the reversing roll stand from coil to coil in a temperature range of 260° C. to a maximum of about 280° C., which is below a recrystallization temperature of the rolled strip;    coiling the strip into finished coils;    feeding each finished coil to a continuous pusher type coil furnace for heat treating the finished coils to a temperature above the recrystallization temperature of the rolled strip and within the range of 315° C. to 320° C.; and    feeding the coils exiting the coil furnace to a cold rolling mill without further heat treating.    
   
   
       2 . The process of  claim 1 , wherein a last three hot rolling passes are carried out without recrystallization.  
   
   
       3 . The process of  claim 1 , wherein the plant has a yearly production capacity below 250,000 tons.  
   
   
       4 . The process of  claim 1 , wherein said step of feeding the coils to the cold rolling mill includes cooling the exiting coils before feeding the exiting coils to the cold rolling mill.