Steel Flow Control with Travelling Magnetic Field for Slab Continuous Caster Mold

Kubota, Jun; Kubo, Noriko; Suzuki, Makoto; Ishii, Toshio; Nishimachi, Ryuzo; Aramaki, Norichika

doi:10.2355/tetsutohagane1955.86.4_271

Cited by 35 publications

(34 citation statements)

References 1 publication

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“…It is highly possible that this entrapment phenomenon occurs near the center between the immersion nozzle and the short side of the mold, because the surface velocity is high at this area. 12) On the other hand, a lubrication area is a crevice part in which flux flows in between the mold and the solidified shell. Since the two phenomena occur in different parts of the mold, it is expected to be possible to satisfy both the properties of "lubrication" and "hard to A non-Newtonian fluid property means that the viscosity of the molten mold flux is low at a high shear rate, which is advantageous for reducing the friction between the mold and the solidified shell, thereby satisfying "lubrication," but is high at a low shear rate, which prevents mold flux entrapment and satisfies the "hard-to-entrap" property.…”

Section: Introductionmentioning

confidence: 99%

Development of New Mold Flux for Continuous Casting Based on Non-Newtonian Fluid Properties

Watanabe¹,

Tsutsumi²,

Suzuki³

et al. 2014

ISIJ Int.

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Due to the importance of the physical and chemical properties of the mold flux used in the production of high-quality steel, in particular the suppression of surface defects on steel sheets, steelmaking engineers have attempted to develop new types of mold flux. This paper presents the results of research on entrapment of mold flux and on heat transfer between the mold and the solidified shell. The authors have been developing a mold flux with non-Newtonian fluid properties using nitrogen. That is, the viscosity of the molten mold flux is low at a high shear rate to reduce the friction between the mold and the solidified shell, but is high at a low shear rate to prevent mold flux entrapment. In order to approximate the properties of mold flux as a non-Newtonian fluid, nitride is added to the conventional flux to adjust the silicate network structure through the reaction between nitrogen and calcium. The contact angle of the nonNewtonian mold flux, which represents the wettability between the mold and the solidified shell, is low in comparison with that of the normal mold flux without nitrogen. It is suggested that the non-Newtonian mold flux increases the heat transfer between the mold and the solidified shell. A casting test was carried out using this non-Newtonian mold flux, and the results showed that entrapment of mold flux decreased and heat transfer increased, as assumed.

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Section: Introductionmentioning

confidence: 99%

Development of New Mold Flux for Continuous Casting Based on Non-Newtonian Fluid Properties

Watanabe¹,

Tsutsumi²,

Suzuki³

et al. 2014

ISIJ Int.

Self Cite

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“…8) The effect of swirling flow on stabling the flow in the mold can match those of electromagnetic flow-control devices in mold (such as M-EMS, EMBR). [8][9][10] However, a swirl blade installed in the nozzle has many demerits such as liable to cause clogging etc., 8) which limits the further application of this process. A new method for swirling flow generation in the nozzle, without the problem of clogging and easy for controlling swirling velocity, has been proposed by the authors.…”

Section: Introductionmentioning

confidence: 99%

Effects of Electromagnetic Swirling Flow in Submerged Entry Nozzle on Square Billet Continuous Casting of Steel Process

Chen

et al. 2013

ISIJ Int.

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In this study, a new method for swirling flow generation in submerged entry nozzle (SEN) in continuous casting of steel process has been proposed. A rotating electromagnetic field is set up around the SEN to induce swirling flow in it by the Lorentz force. And this kind of electromagnetic swirling flow in the SEN is proposed to use in square billet continuous casting of steel process. The effects of coil current intensity and nozzle structure on the flow and temperature fields in the SEN and mold are numerically simulated and verified by an electromagnetic swirling model experiment of low melting point alloy. The overall results of the study show that the magnetic flux density and the swirling flow velocity in the SEN increase with the increase of coil current intensity. The largest swirling flow velocity in the SEN can reach about 3 m/s when coil current intensity 500 A, frequency 50 Hz. The electromagnetic swirling flow in the SEN can reduce the impinging depth of the flow and increase the upward flow. An impinging flow near the mold corner can be observed. The flow field changes mentioned above result in a uniform temperature field in the mold, increase the meniscus temperature, effectively increase the temperature at the mold corner. The divergent nozzle used in this new process also reduces the impinging depth, increases the upward flow and makes the meniscus temperature increase significantly.

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“…It is essential to stabilize fluid flow in the mold to produce high quality steel, therefore, much research has been performed controlling flow pattern of the molten steel from various technical aspects. [1][2][3][4][5][6][7][8][9] Application of electromagnetic force into molten steel flow in the mold and optimizing submerged entry nozzle design is a possible effective measure. Various types of static magnetic field (brake) 3,4) and traveling magnetic field 5,6) are installed into commercial continuous caster.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9] Application of electromagnetic force into molten steel flow in the mold and optimizing submerged entry nozzle design is a possible effective measure. Various types of static magnetic field (brake) 3,4) and traveling magnetic field 5,6) are installed into commercial continuous caster. Various designs of submerged entry nozzle are also proposed to optimize spouting stream from nozzle.…”

Section: Introductionmentioning

confidence: 99%

Fluid Flow Behavior in Submerged Entry Nozzle of Continuous Casting

Kato¹,

Hara²,

Muto

et al. 2007

ISIJ Int.

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Steel Flow Control with Travelling Magnetic Field for Slab Continuous Caster Mold

Cited by 35 publications

References 1 publication

Development of New Mold Flux for Continuous Casting Based on Non-Newtonian Fluid Properties

Development of New Mold Flux for Continuous Casting Based on Non-Newtonian Fluid Properties

Effects of Electromagnetic Swirling Flow in Submerged Entry Nozzle on Square Billet Continuous Casting of Steel Process

Fluid Flow Behavior in Submerged Entry Nozzle of Continuous Casting

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