HOT ROLLING METHOD AND HOT ROLLING LINE OF STEEL STRIP

摘要

PROBLEM TO BE SOLVED: To provide a hot rolling method and hot rolling line capable of producing a hot-rolled steel strip having further higher strength than the former. SOLUTION: Cooling and repeated bending are started for the steel strip within 1.5 sec after the end of finish rolling of the steel strip and the temperature of the steel strip at the end of the repeated bending is regulated to≥600°C and the strain to be given to the steel strip in the repeated bending is specified to≥0.4. A repeated bending device 44 is therefore installed in the downstream of the final rolling mill 41 of a finishing mill in the hot rolling line 100 to allow the repeated bending to be started within 1.5 sec after the end of the finish rolling in the hot rolling line 100, and a ccoling device 44d for cooling the steel strip 10 within the repeated bending device 44 is installed. COPYRIGHT: (C)2007,JPO&INPIT