Title

IMPROVED QUALITY AND PRODUCTIVITY IN SLAB CASTING BY ELECTROMAGNETIC BRAKING AND STIRRING

IMPROVED QUALITY AND PRODUCTIVITY IN SLAB CASTING BY ELECTROMAGNETIC BRAKING AND STIRRING

Authorship

Carlsson, Christer; Yang, Hongliang; Hackl, Helmut; Jacobson, Nils

Carlsson, Christer

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Yang, Hongliang

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Hackl, Helmut

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Jacobson, Nils

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DOI

10.5151/2594-5300-15954

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Abstract

Increasing the productivity and improving the product quality are today permanent demands in the continuous casting process. Many serious quality problems, including non-metallic inclusions and gas bubble entrapments, are directly associated with the flow pattern in the mold. The molten metal flow in the mold is influenced by many variables, including the nozzle design and submerged depth, mold geometry, steel flow rate and argon injection rate. Various electromagnetic actuators have been developed to control the flow pattern in the mold. Especially during recent years this technology has gained extensive interest from many steel plants all over the world. The purpose of this paper is to describe today’s existing electromagnetic technologies, discuss optimum flow conditions based on actual plant results and numerical simulations, and finally serve as a guideline for the selection of the ideal electromagnetic devices for various casting practices.

Increasing the productivity and improving the product quality are today permanent demands in the continuous casting process. Many serious quality problems, including non-metallic inclusions and gas bubble entrapments, are directly associated with the flow pattern in the mold. The molten metal flow in the mold is influenced by many variables, including the nozzle design and submerged depth, mold geometry, steel flow rate and argon injection rate. Various electromagnetic actuators have been developed to control the flow pattern in the mold. Especially during recent years this technology has gained extensive interest from many steel plants all over the world. The purpose of this paper is to describe today’s existing electromagnetic technologies, discuss optimum flow conditions based on actual plant results and numerical simulations, and finally serve as a guideline for the selection of the ideal electromagnetic devices for various casting practices.

Keywords

Electromagnetic stirring; Electromagnetic braking; Continuous casting; Defects; Mold flow; Flow pattern; Inclusion removal.

Electromagnetic stirring; Electromagnetic braking; Continuous casting; Defects; Mold flow; Flow pattern; Inclusion removal.