Nippon Steel Corporation

Kawasaki Jukogyo Kabushiki Kaisha

Keizi Arima

Toru Yoshida

Yujiro Ueda

Kiyoshi Takashima

Hiroshi Narita

Hisashi Mori

Masahiro Ohtsuki

Takeshi Shozi

Seishi Ogata

A method and apparatus for directly observing the slag-foaming conditions in a vessel interior. A device for observing the vessel interior light is disposed in a throughhole extending through the side wall of a top-blowing or top- and bottom-blowing converter to reach the vessel interior. The converter operation can be carried out at a high accuracy on the basis of this observation.

Method and apparatus for measuring slag-foam conditions within a

A method for operating a converter on the basis of a direct observation of the slag-forming conditions in a vessel interior. A device for observing the vessel-interior light is disposed in a throughhole extending through the side wall of a top-blowing or top- and bottom-blowing converter to reach the vessel interior. The converter operation can be carried out at a high accuracy of the slag-amount control on the basis of this observation.

Method for operating a converter used for steel refining

An exhaust-gas treatment system for a sealed-type converter has a hood for guiding converter exhaust gas and is provided with an emergency air admission valve device communicatively connected to the hood and comprising, essentially, a valve seat communicating with a valve entrance for inflow of outside air, a valve body normally in valve closed position against the valve seat to shut off air from entering the hood, and a valve body locking device functioning to normally hold the valve body in locked state in the valve closed position and operating in an emergency to release the valve body, which thereupon separates away from the valve seat thereby to admit outside air into the hood to prevent occurrence of negative pressure in the hood.

Exhaust-gas treatment system for a sealed-type converter

Treatment of molten steel in a ladle, which comprises blowing inert gas into the ladle from its bottom, partially immersing a receptacle which covers the portion of the molten steel where the inert gas bubbles out and maintain non-oxidizing atmospheres within the receptacle with the gas so as to prevent oxidation of the molten steel by the slag.

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Sakai, Japan

Keizi Arima