| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cooling method capable of obtaining a hot-rolled steel sheet suitable to manufacture an original sheet of a hot-dip galvanized sheet. <P>SOLUTION: In this method of introducing the hot-rolled steel sheet containing 0.2 mass% or more of Si to a cooling facility arranged downstream of a hot rolling line and supplying cooling water to upper and lower faces of the steel sheet to cool the steel sheet, a temperature of at least one of regions of 50-150 mm from ends in the width direction toward a center portion of the hot-rolled steel sheet and regions of a tip portion and a tail edge portion of the hot-rolled steel sheet corresponding to 5-30% of a length in the longitudinal direction is kept higher than that of a steady portion. <P>COPYRIGHT: (C)2013,JPO&INPIT |
