MANUFACTURE OF HOT ROLLED STEEL SHEET WITH THIN SCALE USING CONTINUOUS HOT ROLLING PROCESS

摘要

PROBLEM TO BE SOLVED: To manufacture a steel sheet whose primary scale is easily descaled and whose scale which is formed on the surface of the steel sheet is thin scale to enable manufacturing the hot rolled steel sheet by a continuos highly productive hot rolling process. ;SOLUTION: In a continuous hot rolling stage in which, after cutting the rear end part of a preceding material of a rough bar and the tip part of the succeeding material, the preceding material and the succeeding material are joined and rolling is continuously executed, after reversing the surface and back faces, and the tip and rear end of steel strips before joining, joining them and, in the finishing rolling after that, high-speed steel rolls are used while making the most of an on-line roll grinder(ORG) in the poststage, finish rolling is always executed at the final rolling speed of ≥800m/min, rapid cooling is executed after rolling and the strip is coiled at 550-360°C.;COPYRIGHT: (C)1998,JPO