METHOD FOR BUTT JOINING HOT STEEL MATERIAL

PURPOSE:To prevent buckling and buildup on a plate 10 a joining part by drawing-down a part of width or the entire width in both butt end parts excluding butt faces in the thickness direction and joining while executing the induction heating of butt ends. CONSTITUTION:The rear end part of a proceding material 3 and the tip part of the following material 4 on a hot rolling line are butted and joined. While executing the induction heating of this butted part with induction heating devices 10a, 10b, a part of width or the entire width in both butt end parts excluding the butt faces is drawn down and joined. After descaling the butt faces with hot scarfers, they are joind. Both end parts in the widthwise direction at the butt end parts excluding the butt faces are drawn down in the thickness direction. In this way, the butt joining of the hot steel material without the generation of buckling, buildup on the plate in the joined part and sliding flaw and without breaking at the time of rolling can be rapidly executed.