METHOD OF MANUFACTURING COLD-ROLLED STEEL SHEET

摘要

<P>PROBLEM TO BE SOLVED: To provide a method of stably manufacturing a cold-rolled steel sheet with good quality by preventing a push-in flaw due to properties of an edge part of a product and trimming after cold rolling. Ž<P>SOLUTION: A pair of upper and lower circular rotary blades are pressed to a predetermined depth from the above and the below with respect to an edge part of a hot rolled steel sheet before pickling. Shearing is applied to the edge part in an unseparated state. The edge parts are separated through pinching by narrow width rolls installed at the respective edge parts and capable of pinching only the edge parts, and then pickling and cold rolling with a reduction rate of ≥30% are applied. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž