Sumitomo Metal Industries, Inc.

Syoji Anezaki

Katsukiyo Marukawa

Isao Yamazaki

Sumio Kobayashi

Seiichi Masuda

Toshio Shiraiwa

Takeyuki Hirata

Minoru Ueda

Yasuyuki Tozaki

Tsutomu Kajimoto

A process and apparatus for making steel in a basic oxygen furnace by the top-blowing of pure oxygen and the bottom-blowing of a gas mainly composed of carbon dioxide are disclosed, in which a waste gas discharged from said basic oxygen furnace is utilized as the only source of the gas to be blown into a molten metal.

Steel making process and apparatus

A process for making carbon steel and low-alloy steel in a basic oxygen furnace is disclosed, which comprises preparing a molten metal suitable for producing the steel in said basic oxygen furnace, carrying out the top-blowing of oxygen gas and bottom-blowing of carbon dioxide gas and then tapping the resulting molten steel. The top-blowing oxygen gas is injected through a lance onto the molten metal at an outlet velocity of Mach 0.8-2.0.

Steel making process

A method of producing carbon steel and low-alloy steel in a basic oxygen furnace is disclosed, in which a blow of the bottom-blowing gas predominantly comprised of carbon dioxide is introduced into a molten metal through at least one nozzle provided in the bottom or side wall of said basic oxygen furnace at least partly during the period of time from the beginning of blowing to the tapping of the melt, and the flow rate of the bottom-blowing gas is 1/200 - 9/100 the rate of oxygen impinged upon the melt through a lance.

Production of carbon steel and low-alloy steel with bottom blowing basic

In an automatic molding apparatus, a Doppler speed meter is used to detect the rising speed of molten metal within a mold, and a nozzle stopper attached to a ladle in which the molten metal is contained is actuated in response to a difference between a detected speed signal and a speed pattern signal to control the opening of the nozzle of the ladle whereby the rising speed of the molten metal fed from the ladle to the mold through the nozzle can be controlled in accordance with an optimum molding velocity pattern.

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Ibaraki, Japan

Syoji Anezaki