| 摘要 |
PROBLEM TO BE SOLVED: To provide a finish-rolling method capable of stably producing high-quality hot-rolled steel strips by using simple means to improve the accuracy of finish outlet side temperature control, and increasing the productivity of hot-rolled steel strips.SOLUTION: The finish-rolling method includes: setting a plate passing speed before the tip of a hot-rolled steel strip 2 is discharged from the last stand 4 of a finish roller 1 installed at a hot rolling line toward a winder to be constant; carrying out finish rolling at the acceleration rate α(m/min/sec) of the plate passing speed until the tip of the hot-rolled steel strip 2 bites into the winder after the discharging from the last stand 4; continuing the finish rolling at the acceleration rate β(m/min/sec) of the plate passing speed, with α<β, after the winding start of the hot-rolled steel strip by the winder; stopping the addition of the acceleration rate β to carry out finish rolling when the temperature of the hot-rolled steel strip on the outlet side of the last stand 4 exceeds a preset threshold value; and adding the acceleration rate β to carry out finish rolling when the temperature of the hot-rolled steel strip on the outlet side of the last stand is lower than the preset threshold value.SELECTED DRAWING: Figure 1 |
