Patent ID: 8440133

Claim:
A manufacturing apparatus of a hot-rolled steel sheet comprising a final stand of a row of hot finish rolling mills and a cooling apparatus the cooling apparatus disposed on a downstream side of a rolling reduction point in a final stand of a row of hot finish rolling mills, and which comprises headers provided with a plurality of cooling nozzles capable of spraying high-pressure water over an upper surface and a lower surface of a steel sheet being transported on a pass line, wherein the cooling apparatus is configured in a manner capable of spraying the high-pressure water from the cooling nozzles, in a transporting direction of the steel sheet, over the upper surface and the lower surface of the steel sheet in a zone from the rolling reduction point in the final stand to an exit side of a housing post in the final stand; and the cooling apparatus is configured in a manner capable of continuously spraying the high-pressure water in the transporting direction of the steel sheet, at least in a zone extending to the exit side of the housing post in the final stand, from a position between the rolling reduction point, at which the steel sheet and the work rolls in the final stand contact with each other, and the position away from said rolling reduction point toward the downstream side in the transporting direction of the steel sheet in the amount of the radius of the work roll in the final stand.