Cooling apparatus, cooling method, manufacturing apparatus and manufacturing method of hot-rolled steel sheet

A cooling apparatus of a hot-rolled steel sheet, which is 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 the zone from within a position corresponding to a radius of a work roll in the final stand to the exit side of a housing post in the final stand.