Nippon Steel Corporation

Z. I. Nekrasov Iron & Steel Institute of the National Academy of Sciences of Ukraine

Michitaka Matsuo

Koji Morita

Takehiko Toh

Shinya Kitamura

Kenichiro Naito

Ryoji Arima

Kazuumi Harashima

Naoto Sasaki

Hiroshi Hirata

Masamitsu Wakoh

Kazuo Onuki

Sohichi Niino

S I Semykin

Kiyokazu Tateishi

Semykin S I

The invention intends to provide a converter refining method capable of blowing molten steel having a low degree of superoxidation with high productivity and high yield. A first aspect resides in a pressurized converter steelmaking method for use in a top-and-bottom blowing converter, wherein a converter internal pressure P is set to a higher level than the atmospheric pressure, and a top-blown oxygen flow rate F and a bottom-blown gas flow rate Q are adjusted depending on changes of the converter internal pressure P. A second aspect resides in a pressurized converter steelmaking method for use in a top-and-bottom blowing converter, wherein a converter internal pressure P is set to a higher level than the atmospheric pressure during the whole or a part of a blowing period, and a top-blown oxygen flow rate F, a bottom-blown gas flow rate Q and the converter internal pressure P are changed depending on a steel bath carbon concentration C.

Pressure converter steelmaking method

A method of refining a molten metal or a molten alloy through degassing, wherein a gas is blown into a molten metal or a molten alloy contained within a refining container, while stirring by utilizing an electromagnetic force, to superimpose the blown gas onto a molten metal or a molten alloy, and the stirring by an electromagnetic force, to thereby refine the blown gas, and at the same time, increase the residence time of the blown gas in the molten metal or molten alloy bath and homogeneously disperse the blown gas in the molten metal or molten alloy bath.

Method of refining molten metal or molten alloy

Growing community of inventors

Futtsu, Japan

Michitaka Matsuo