Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho

Shozo Kawasaki

Minoru Kitamura

Kiichi Narita

Kenta Yoshii

Mitsuo Tomonaga

Yasuo Kanazuka

Nozomu Katagiri

Akitsu Tomita

Katsuyoshi Matsuo

Kazuyuki Seki

Tetuo Sato

A method for electromagnetically stirring molten steel in continuous casting wherein in producing cast slabs or blooms, an electromagnetic stirring force is applied to the unsolidified molten steel in the cast slab or bloom being drawn. An electromagnetic stirrer is installed between drawing positions where the unsolidified thickness is 45% and 15%, respectively, of the thickness as viewed in the direction of the thickness of the cast slab or bloom, and stirring in the casting direction is applied to the unsolidified molten steel in such a manner that the product of the magnetic flux density (gauss) at the interface between the unsolidified and solidified portions and the stirring time in minutes (which is defined as the ratio of the stirring effective length (mm) of the electromagnetic stirrer to the casting speed (m/min)) is 1,600 gauss-min or more per m.sup.3 of the total volume (m.sup.3) of unsolidified molten steel present in a region extending to the drawing side from the position where the electromagnetic stirrer is located.

Method for electromagnetically stirring molten steel in continuous

A method for converter blow end-point control which comprises carrying out waste gas analyses on a continuous or intermittent basis in a final stage of the blow and, based on decarburization rate data (waste gas information) obtained from said waste gas analysis, determining the end-point of the blow where the carbon content of the bath equals a target carbon content. The method is characterized by the use of the decarburization rate equation: ##EQU1## which is a differential equation taking account of the delay time (.tau.) of said waste gas information which is a period of time from the time-point of occurrence of a decarburization reaction in the converter till the time when it is detected as said decarburization rate data, and an equation:

Method for converter blow control

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Kobe, Japan

Shozo Kawasaki