Kawasaki Steel Corporation

Nobuyoshi Takashiba

Shinji Kojima

Kiyoshi Takahashi

Fumiaki Yoshikawa

Hisakazu Mizota

Tadaaki Iwamura

Yasuharu Miyazaki

Hiroshi Okamoto

Haruji Okuda

Shigeru Ohmiya

Shunji Ohtsubo

Koji Numata

Takahashi Kiyoshi

Takayasu Yamada

Ryuichi Ikeda

Rinzo Tachibana

An oxygen blowing lance capable of directing oxygen jet streams onto a molten metal in an electric furnace, the lance being insertable into an electric furnace through a sidewall working port, the lance being positionable above the molten metal in the electric furnace. The lance includes a horizontal segment and an angled segment, the angled segment being positioned on the distal portion of the horizontal segment and being inclined relative to the horizontal segment. The lance also includes a tip, the tip being positioned on the distal portion of the angled segment, with the distal portion of the tip being directed toward the molten metal. The horizontal segment, the angled segment and the tip define an oxygen flow channel and a cooling water flow channel. The oxygen flow channel extends substantially the length of the lance, and the cooling water flow channel surrounds the oxygen flow channel. The lance also includes a plurality of nozzles, each having a throat portion having a throat diameter and an outlet portion having an outlet diameter, the throat portions of the nozzles being positioned on the distal portion of the tip. The nozzles are operatively engaged with the oxygen flow channel, and at least one of the nozzles is positioned nearer the molten metal than the other nozzles.

Oxygen blowing lance capable of being used in an electric furnace

Direct current electric furnace for melting metal

A furnace bottom structure of a direct current electric furnace has at least one furnace bottom electrode and at least one gas injection tuyere provided in the furnace bottom refractory of the direct current electric furnace. Preferably, the furnace bottom electrodes and the gas injection tuyere are embedded in a substantially cylindrical refractory body with downwardly diverging tapered upper portion. The refractory body, the furnace bottom electrodes and the gas injection tuyere form an integral furnace bottom block which is detachably attached to the bottom of the electric furnace so as to close a bottom opening of the furnace.

Furnace bottom structure of direct current electric furnace

A method and apparatus for vacuum degassing blows gas into molten metal so as to form a substantially uniformly distributed bubble over the path area defined by an induction pipe. In order to achieve this, discharge nozzles are separated into at least two groups. The pressures of the gases discharged through the discharge nozzles in different groups are controlled independently of the other so that gas blown through a first group of nozzles forms bubbles at around the central portion of the induction pipe and the pressure of the gas blown through the other group of nozzles is adjusted for forming the bubbles in the vicinity of the periphery of the induction pipe.

Method and apparatus for degassing molten metal utilizing RH method

A lance for blow-refinement in a converter comprises a primary nozzle generating a high-velocity, high-pressure primary oxygen jet, and an auxiliary nozzle generating an auxiliary oxygen jet. The auxiliary oxygen jet formed by the auxiliary nozzle has a velocity lower than the speed of sound. The auxiliary nozzle is configured so as to impede but not prevent oxygen flow therethrough. In the preferred construction, deceleration of gas-metal reaction induced by the oxygen jet.

Lance for blow-refinement in converter

Growing community of inventors

Okayama, Japan

Nobuyoshi Takashiba