Nippon Steel Corporation

Kawasaki Jukogyo Kabushiki Kaisha

Yoji Ao

Hideo Kaneko

Hiroyuki Nakashima

Hatsuyoshi Kumashiro

Hiroshi Iwasaki

Taizou Kiyosuke

Sadaaki Murakawa

Kazuaki Sueoka

Makoto Ueda

Toshio Iida

Kenichi Murai

Isao Tokuda

Minoru Honda

Yoshikazu Nishi

There is disclosed a method by which a channel-type induction heating apparatus is provided on a tundish, which comprises a steel receiving chamber and a steel discharging chamber separated by a refractory wall, each of which chambers is connected to the ground via molten steel flowing from a ladle, molten steel flowing into a mold, or a refractory, in such a manner that ground circulating current is prevented from being generated. An electromagnetic connection of an induction heating coil and an iron core of a two-leg type or a three-leg type to a loop current circuit in the molten steel is arranged symmetrically, thereby suppressing the generation of the ground circulating current. By thus suppressing the generation of the ground circulating current, it becomes unnecessary to insulate a ground circuit as required in conventional constructions, the maintenance of facilities becomes easier, besides any malfunction of the equipment due to the ground circulating current is totally eliminated.

Method of preventing generation of earth circulating current in

In a method and apparatus for withdrawing a strand in a horizontal continuous casting installation, the strand is withdrawn from a mold by a predetermined stroke and then retracted by a smaller stroke corresponding to shrinkage of the strand. This cycle of withdrawal and retraction is repeated intermittently. A strand withdrawing and retracting characteristic of a cycle is set in a control unit, and pinch rolls for withdrawing and retracting the strand are controlled based on the set characteristic. Actual withdrawing and retracting strokes of the strand are detected by a detecting device and the detected signal is compared with the set characteristic to produce an instruction signal which is fed back to the pinch rolls, so that the positional accuracy of the strand and the quality of the strand are improved.

Method of and apparatus for withdrawing strand in horizontal continuous

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Kitakyushu, Japan

Yoji Ao