| 摘要 |
PURPOSE:To improve the surface condition of a steel plate by removing completely the secondary scale in the hot rolling of the steel plate by ejecting twice high-pressure water for descaling at the stage of releasing pass just before the final rolling and at the stage of gripping of a pass of the final rolling. CONSTITUTION:In a stage of hot rolling of a steel plate, high-pressure water at 100-180kgf/cm<2> is ejected for 30sec at the releasing stage of a pass before the pass using the final mill descaling at >=850 deg.C rolling temp. to raise the secondary scale on the steel plate. The raised scale is completely stripped off by ejecting succeedingly the high-pressure water similarly for 30sec before the plate is gripped by the final rolling mill, and the descaled plate is gripped by the final roll. In this way, a steel plate having beautiful surface without scale pattern is produced. |
