Kawasaki Steel Corporation

Seiko Nara

Kiyoshi Shibuya

Toru Sato

Tetsuya Fujii

Nobuyuki Morito

Nagayasu Bessho

Teruo Hiramatsu

Kenichi Sorimachi

Yoshiei Kato

Kyoji Nakanishi

Akira Idogawa

Hisao Yamasaki

Method of continuously casting steels

A method of manufacturing steel having Ca including the steps of adding Ca metal or alloy containing Ca to molten steel in a ladle that has been killed by adding a reducing agent, such as Al, to the molten steel in a predetermined quantity when or after the molten steel has been discharged from a converter, subjecting the molten steel to a vacuum degasification process, and supplying the molten steel to a mold through a tundish so that the molten steel is continuously cast, wherein Ca metal or alloy containing Ca is added to the molten steel in the tundish.

Method of manufacturing steel containing Ca

In a continuous casting of steel slab, a molten steel is provided having an oxygen concentration of not more than 35 ppm and is supplied from a tundish into a continuous casting mold through a straight immersion nozzle having an open end at the forward end thereof, the mold consisting of a combination of a pair of narrow face mold walls and a pair of wide face mold walls. A traveling magnetic field generating device is disposed on a central area of the outer surface of the wide face mold walls. While the open forward end of the nozzle is positioned in the magnetic field region of the traveling magnetic field generating device, a traveling magnetic field which is perpendicular to the wide face mold walls and which is traveling upward is applied to a flow of the molten steel discharged from the nozzle, thereby controlling the flow. Preferably, an upper or lower static magnetic field generating device or both of them may be also used.

Continuous casting method of steel slab

A gaseous atmosphere having a predetermined composition is formed near an injected molten metal flow and an injection nozzle of the atmospheric gas so as to manufacture a thin metal strip exhibiting excellent surface property. A thin strip manufacturing apparatus includes an injection nozzle 1 for injecting a molten metal onto a cooling roll 2, an atmospheric gas injection nozzle 3 for injecting an atmosphere having a predetermined composition, a sensor 5 for measuring the concentration of the atmospheric gas, a control device 6 for adjusting a flow rate of the atmospheric gas on the basis of the output of the sensor 5, a cover 4 for maintaining the concentration of the atmospheric gas, and a heating device for preventing cooling of the injection nozzle 1.

Method and apparatus for manufacturing a thin metal strip by quenching

A method of guiding and transferring a rapidly quenched metallic tape includes steps of peeling the rapidly quenched metallic tape produced by solidification through rapid quenching on a circumferential surface of a single cooling roll rotating at a high speed, introducing the metallic tape into a cylindrical transfer guide to a pinch roll unit arranged at a terminal end of the transfer guide to catch the metallic tape by the pinch roll unit, and moving the pinch roll unit to a winder for the metal tape. The metallic tape is fed in the transfer guide substantially without being in contact with the transfer guide. An apparatus for guiding and transferring a rapidly quenched metallic tape includes a cylindrical transfer guide arranged on a normal line of a single cooling roll for introducing and guiding the metallic tape, a pinch roll unit arranged at a terminal end of the transfer guide for catching the metallic tape, and a transfer trolley for transferring the pinch roll unit to a winder for the metallic tape.

Apparatus for transferring rapidly quenched metallic tapes

An apparatus for transferring a rapidly quenched metallic tape, which is produced by solidification through rapid quenching on a circumferential surface of a single cooling roll rotating at a high speed, from the cooling roll into a winder, comprises a transfer means provided with a pinch roll unit for catching and feeding out the peeled metallic tape, a fan for breaking and discharging the metallic tape fed out from the pinch roll unit, and a dust device for recovering metallic pieces and powder generated in the breakage of the metallic tape by the fan.

Growing community of inventors

Chiba, Japan

Seiko Nara