Method for manufacturing a high-strength steel sheet for a can

Abstract

A method for manufacturing a high-strength steel sheet for a can, including (a) hot rolling a steel slab at a slab extraction temperature of 1200° C. or more and a finish rolling temperature of (Ar3 transformation temperature−30)° C. or more, the steel slab containing, on the basis of mass percent, more than 0.02%, but 0.10% or less of C, 0.10% or less of Si, 1.5% or less of Mn, 0.20% or less of P, 0.20% or less of S, 0.10% or less of Al, 0.0120% to 0.0250% of N, and the balance being Fe and incidental impurities; (b) coiling at a temperature of 650° C. or less; (c) pickling; (d) carrying out a first cold rolling; (e) continuously annealing; and (f) carrying out a second cold rolling at a reduction ratio of 10% or more and less than 20%.

1 . A method for manufacturing a high-strength steel sheet for a can, comprising: (a) hot rolling a steel slab at a slab extraction temperature of 1200° C. or more and a finish rolling temperature of (Ar3 transformation temperature−30)° C. or more, the steel slab containing, on the basis of mass percent, more than 0.02%, but 0.10% or less of C, 0.10% or less of Si, 1.5% or less of Mn, 0.20% or less of P, 0.20% or less of S, 0.10% or less of Al, 0.0120% to 0.0250% of N, and the balance being Fe and incidental impurities; (b) coiling at a temperature of 650° C. or less; (c) pickling; (d) carrying out a first cold rolling; (e) continuously annealing; and (f) carrying out a second cold rolling at a reduction ratio of 10% or more and less than 20%. 
     
     
         2 . The method for manufacturing a high-strength steel sheet for a can according to  claim 1 , wherein a soaking temperature of the continuous annealing is equal to or higher than the Ar1 transformation temperature. 
     
     
         3 . The method for manufacturing a high-strength steel sheet for a can according to  claim 1 , further comprising plating after carrying out the second cold rolling. 
     
     
         4 . The method for manufacturing a high-strength steel sheet for cans according to  claim 2 , further comprising plating after carrying out the second cold rolling. 
     
     
         5 . The method for manufacturing a high-strength steel sheet for cans according to  claim 1 , wherein the steel sheet has a thickness of 0.3 mm or less. 
     
     
         6 . The method for manufacturing a high-strength steel sheet for cans according to  claim 3 , wherein the steel sheet has a thickness of 0.3 mm or less.