| 摘要 |
PURPOSE:To increase a direct-feeding rolling quantity and to decrease rejected materials by rolling alternately a steel sheet of lower thickness than the specific value of product sheet thickness by changing its thickness from a thin sheet to a thick one or from a thick one to a thin one under specific conditions, in rolling a hot slab manufactured in a continuous casting process by feeding it directly to a rolling process. CONSTITUTION:A hot slab manufactured in a continuous casting process is directly fed to a rolling process to manufacture a hot rolled steel sheet by rolling. At that time, a steel sheet having the thickness lower than the product thickness of <=2.5mm. is alternately rolled by changing its thickness from a thin sheet to a thick one or from a thick one to a thin one under the following conditions (1), (2) i.e. (1) the alternate rollings are restricted within 3 slabs, (2) the changing difference of thickness is restricted within the limits of 0.7-1.3mm.. |
