Patent ID: 8051695

Claim:
A method for cooling a hot strip, which is obtained after a hot rolling process, by bringing cooling water into contact with the hot strip, the method comprising: a first cooling step and a subsequent second cooling step, wherein, in the first cooling step, cooling is stopped at a strip surface temperature that is higher than a transition boiling initiation temperature and, in the subsequent second cooling step, cooling is conducted using cooling water having a water flow rate that causes nucleate boiling, and coiling is subsequently conducted, in the first cooling step, cooling is conducted using cooling water having a water flow rate of 350 to 1200 L/min·m 2 and is stopped at a strip surface temperature of more than 500° C., and in the second cooling step, cooling water having a water flow rate of 2500 L/min·m 2 or more is supplied to at least an upper side of the strip to decrease the strip surface temperature to 500° C. or less, and at least the upper side of the strip is cooled by laminar cooling or jet cooling while a velocity at which cooling water is ejected from cooling water supply nozzles by the laminar cooling or the jet cooling is 7 m/s or more.