Nippon Kokan Kabushiki Kaisha

Shigeki Komori

Masahiro Tsuru

Nobuhisa Hasebe

Masayuki Hanmyo

Hiroshi Kawada

Shinobu Kumagai

Shinobu Miyahara

Moriyuki Ishiguro

Shigetaka Uchida

Naoki Yokoyama

Hideo Uchibori

Yoshiharu Hirota

Kazuo Mitani

Isao Sugawara

A horizontal type continuous casting machine for casting molten steel into a cast steel strand, which comprises: a tundish for receiving molten steel to be cast; a horizontal metal mold connected through a front nozzle, a feed nozzle, a break ring and a metal spacer ring having therein a cooling water passage to an opening provided in the lower portion of a side wall of the tundish; at least one pair of pinch rolls for intermittently and continuously withdrawing molten steel directed from the tundish to the horizontal mold into a cast steel strand in the horizontal direction through the horizontal mold by means of a plurality of cycles each comprising one pull and one push; and a cooling zone for cooling the cast steel strand withdrawn from the horizontal mold.

Horizontal type continuous casting machine for casting molten steel into

In a horizontal continuous casting machine having a casting withdrawing cycle consisting of withdrawing, stopping and push-back periods, a method of controlling the stop of the flow of a casting during the stopping period of the withdrawing cycle so as to stop the flow of the casting within a predetermined period. The desired braking torque is calculated in consideration of the load variations due to the casting condition of the horizontal continuous casting machine and the braking torque is applied to the pinch roll shafts upon the termination of the withdrawing period thereby effecting the stop of the flow of the casting during the stopping period within the predetermined time.

Flow stop control method and apparatus for casting withdrawal control of

A method and an apparatus for removing a cutting burr produced when longitudinally fusion-cutting a slab and sticking to the lower surface of the slab along the fusion-cutting line, which comprise placing a slab having the cutting burr on a roller table comprising a plurality of rollers and horizontally extending with the lower surface having the cutting burr of the slab down so that the line of the cutting burr agrees with the travelling direction of the roller table; lifting a cutter of a burr cutting machine provided below the roller table to bring the cutter into contact with the lower surface having the cutting burr of the slab; horizontally moving the cutter toward the line of the cutting burr of the slab until the cutter passes the line of the cutting burr while keeping the contact with the lower surface of the slab, to cut off a part of the cutting burr by a length corresponding to the total length of a knife of the cutter by means of the knife of the cutter, and, horizontally pulling the cutter back to the original position thereof; forwarding the slab on the roller table in the travelling direction of the roller table by a distance substantially equal to the total length of the knife of the cutter; and, repeating at least once the cut-off of the cutting burr of the slab by means of the cutter, thereby substantially completely removing the cutting burr of the slab.

Method and apparatus for removing cutting burr sticking to lower surface

In continuously casting steel, at least two pairs of reduction rolls are arranged near the crater top where the solidification of the molten steel in the cast strand is completed, said reduction rolls having a roll pitch of 200 to 420mm and giving a draft per pair of 0.1 to 2.0%, and said cast strand is reduced near the to of said crater, whereby the inner quality of said cast strand is remarkably improved.

Method for continuously casting steel

Growing community of inventors

Kawasaki, Japan

Shigeki Komori