equipamento de resfriamento de chapa de aço, e equipamento de produção e método de produção de chapa de aço laminada a quente

The present invention provide, in a production line of a hot-rolled steel sheet: a cooling apparatus of a steel sheet which is excellent in discharging water without hindering the movement of a steel sheet (sheet passing); and a manufacturing apparatus and manufacturing method of a hot-rolled steel sheet. The cooling apparatus 20 of a steel sheet is disposed on a lower process side of a final stand 11g in a row 11 of hot finish rolling mills, and comprises a plurality of cooling nozzles 21c, 22c arranged in a manner capable of cooling a steel sheet 1 being transported on transporting rolls 12, wherein the cooling nozzles are arranged on an upper surface side and a lower surface side of an area in which the steel sheet passes, in a manner capable of spraying cooling water over the area; a lower surface guide 40 is arranged on the lower surface side; the lower surface guide comprises: inlet holes 42 through which cooling water sprayed from the cooling nozzles on the lower surface side passes; and outlet holes 43 through which the cooling water passes, dropping downwardly to be discharged; and the inlet holes and the outlet holes are arranged alternately in a moving direction of the steel sheet.