Method of manufacturing cold-rolled can steel sheet having less planar anisotropy and good workability.

摘要

A method of manufacturing a cold-rolled can steel sheet having less planar anisotropy and achieving good workability. Rough-rolling is first performed on a continuously-cast slab. The slab has a composition essentially consisting of: C: 0.004wt% or lower; Mn: 0.05 - 0.5wt%; P: 0.02wt% or lower; Al: 0.005 - 0.07wt%; N: 0.004wt% or lower; and Nb: 0.001 - 0.018wt%, the rest being Fe and unavoidable impurities. A resultant sheet bar is then subjected to hot rolling which is completed at a finishing rolling temperature at an Ar3 transformation point or higher. The resultant sheet bar is coiled at a temperature range from 450 - 700 DEG C. Subsequently, the resultant sheet bar undergoes primary cold rolling before continuous annealing, which is performed at a recrystallization temperature or higher, and secondary cold rolling. The primary and secondary cold rolling are respectively performed at reduction ratios satisfying the following conditions of: 88%