HOT ROLLING METHOD AND METHOD OF MANUFACTURING HOT ROLLED STEEL SHEET, AND HOT FINISH ROLLING MILL AND APPARATUS FOR MANUFACTURING HOT ROLLED STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide a hot rolling method and a method of manufacturing a hot rolled steel sheet by which operation troubles such as a slip when the tip of a next material is bitten can be suppressed while surface roughening near a tail end part of a rolled material is suppressed.;SOLUTION: There is provided the hot rolling method in which amount of lubricant supplied to a roll is controlled to satisfy P=xPA+(1-x)PB (provided that, 0.25≤x≤0.80) when performing a lubrication rolling on a rolled material in a hot finish rolling mill in which the lubricant is supplied to the roll. P is a measured value of a rolling load, PA is a rolling load value in no lubrication state calculated by a theoretical calculation, and PB is a rolling load value when a large quantity of the lubricant is supplied until a state where the rolling load reduction is saturated. The method of manufacturing a hot rolled steel is also provided which includes a process in which a steel sheet is hot-rolled by using the hot rolling method.;COPYRIGHT: (C)2014,JPO&INPIT