METHOD OF GRINDING SLAB, SLAB FOR HOT ROLLING AND METHOD OF MANUFACTURING STEEL SHEET USING THEM

摘要

PROBLEM TO BE SOLVED: To provide a method of grinding a slab for providing an edge chamfering shape which simultaneously suppresses the occurrence of flaws due to the irregularity of a conditioned surface and the occurrence of edge seaming flaws, and to provide a slab for hot rolling the edge parts of which are chamfered by using the method and a method of manufacturing a steel sheet using them. SOLUTION: When chamfering the edge parts of a continuously cast slab 17 with the use of an automatic grinding device which uses the position coordinate data of edge parts of the slab 17 obtained by measuring the shape of the slab 17 to be conveyed and performs chamfering by controlling a grindstone which is movable in the conveying direction and a direction orthogonally crossed with the conveyance direction, grinding is performed in such a way that an angleθbetween adjacent segments of the ridge-line which is composed of a plurality of segments having one or a plurality of inflecting points and being connected in a polygonal-line shape at the inflecting points, is alwaysθ≤60°at all inflecting points or the length of short segment of the adjacent segments at the inflecting points whereθis above 60°is not more than 25 mm. COPYRIGHT: (C)2009,JPO&INPIT