| 摘要 |
The present invention provide, in a manufacturing line of a hot-rolled steel sheet, a manufacturing method of a hot-rolled steel sheet which is capable of providing a target temperature for a temperature of a rolled material in a final stand 11g in a row 11 of hot finishing mills, even when a cooling device 35 capable of cooling from inside the row of hot finishing mills is disposed. The method comprises: rapidly cooling the rolled material by spraying cooling water at an inside of the final stand on a lower process side of the final stand in the row of hot finishing mills; obtaining an entry-side surface temperature of the rolled material on an entry side of the final stand; and calculating a target surface temperature on the entry side of the final stand, from an exit side target surface temperature on an exit side of the final stand, based on a heat generated by rolling processing in the final stand, a temperature reduction by contact of work rolls in the final stand with the rolled material, and a temperature reduction by air cooling in transporting the rolled material. |
