| 摘要 |
PURPOSE:To produce cold rolled steel plate having high deep drawability from an extra low carbon steel as blank material and can be subjected to continuous annealing in a process for hot rolling and then cold rolling an extra low carbon steel having a specified compsn. for breadth rolling of a rough rolling stage in hot rolling. CONSTITUTION:A billet consisting by wt%, <=0.004 C, further if necessary, <=0.05 in total of at least two kinds among W, Ti, Nb, B, Zr, Al, and rare earth element, and residual wt% Fe is hot-rolled. In the rough rolling stage of this hot rolling, broad side rolling or width-reducing rolling of >=20% total breadth draft is performed. By performing such rolling, a cold rolled steel plate of extra low carbon content for deep drawing having superior deep drawability and surface property is produced with high productivity. |
