| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus and method for cooling of a hot rolled steel sheet which can secure uniformity of shape characteristics and material characteristics in the transverse direction of the steel sheet at a low cost and at ease by preventing over-cooling on both side edge portions of the steel sheet, when cooling the rolled steel sheet by jetting a coolant from multiple rows of spray nozzles arranged above onto the upper surface of the hot rolled steel sheet being conveyed. SOLUTION: In both the side edge portions on the upper surface of the hot rolled steel sheet restrained between a plurality of restraining rolls, banks are arranged 10-300 mm apart to the width center side from the edge of each side, and coolant pools with agitated convection are formed while the coolant jetted from the spray nozzles is restrained from flowing out to the side edge portions. After cooling the steel sheet in the coolant pool, the coolant flows out transversely to the conveying direction from openings between the rear ends of the banks and the rear restraining roll and is discharged outside through the side edge portions of the steel sheet. Here, the above bank is formed by jet stream of the sprayed coolant. COPYRIGHT: (C)2005,JPO&NCIPI
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