Sumitomo Metal Industries, Inc.

Hidetoshi Suwa

Nobuhiro Okada

Akihiro Yamanaka

Sei Hiraki

Kouji Takatani

An electromagnetic stirrer for stirring molten steel of the liquid core in a width-wise direction of the slab includes an iron core disposed with its length-wise axis along a width-wise direction of slab, and a plurality of exciting coils wound around the outer circumference of and about a length-wise axis of the iron core, wherein two-phase or three-phase alternating current is passed through the coils. The phases of the current in the exciting coils are distributed to impart a stirring flow to the molten that includes flow from the minor sides to the center of the slab or from one minor side to the other minor side with a reversing flow at predetermined time intervals.

Method for continuous casting of steel and electromagnetic stirrer to be used therefor

Disclosed is a continuous casting in which an electromagnetic stirrer is installed upstream, in the casting direction, of the reduction rolling position of a slab, and in which a slab with a liquid core is reduced in thickness, wherein by imparting a collision flow forming-type stirring and a uni-directional alternating flow forming-type stirring, molten steel with concentrated segregation elements is stirred and diffused in a width-wise direction of slab, whereby a slab stabilized in center segregation qualities can be produced over long-time casting operation. Since the stirring flowing pattern is selectively imparted by means of the same electromagnetic stirrer, it is effective to decrease facility and equipment costs, improve maintainability, and extensively cope with various casting conditions. The continuous casting method stably ensures excellent center segregation qualities over a long time in casting of high-strength steel with high crack susceptibility or steel grade for extremely thick plate product.

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Itako, Japan

Hidetoshi Suwa