METHOD OF MANUFACTURING THICK STEEL PLATE

PROBLEM TO BE SOLVED: To provide a method of manufacturing a thick steel plate, in which the rolling pass schedule is decided by determining which of the improvement of the efficiency of rolling and the improvement of yield is given a priority in accordance with the demand situation or the like of the thick steel plate. SOLUTION: In the method of manufacturing the thick steel plate, in which rolling for obtaining the thick steel plate having a desired size by performing edger rolling and horizontal rolling is performed, when deciding which of the improvement of the efficiency of rolling and the improvement of yield is given a priority in performing rolling, and when the improvement of the efficiency of rolling is selected, the size of a slab, which is necessary to manufacture the thick steel plate having the same size as that of the steel plate to be manufactured by the set rolling pass schedule by a modified rolling pass schedule in which the number of times of the edger rolling is reduced, is calculated. The slab having the slab size after calculation is prepared and rolling is performed by the modified rolling pass schedule or a remodified rolling pass schedule in which the calculation of the rolling pass schedule is again performed. COPYRIGHT: (C)2011,JPO&INPIT