| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a thick steel plate by which hair cracks in the front and the rear end parts are efficiently prevented by a simple means without requiring new equipment. SOLUTION: In a method for manufacturing the thick steel plate by performing hot rolling consisting of rough rolling and finish rolling to a continuously cast slab, cross rolling is performed from the first pass and the cross rolling is performed at the cross rolling ratio ( the width of the product/the width of the slab ) of≥1.3 and within 15% in the draft of each pass of the cross rolling. Next, the slab is turned 90°and thickness adjusting rolling is performed. It is preferable that the continuously cast slab is a slab having width such as the cross rolling ratio is≥1.3. COPYRIGHT: (C)2005,JPO&NCIPI
|
