Inclusion Separation from Molten Steel in Tundish with Rotating Electromagnetic Field

Miki, Yuji; Kitaoka, Hidenari; Bessho, Nagayasu; Sakuraya, Toshikazu; Ogura, Shigeki; Kuga, Mutsuo

doi:10.2355/tetsutohagane1955.82.6_498

Cited by 14 publications

(10 citation statements)

References 2 publications

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“…There are technologies that inclusion particles are intentionally coagulated with a magnetohydordynamic flow in a tundish, which is developed by Miki et al, 60) called Centrifugal Magnetic Field Tundish. However, since the inclusion particles can be removed fully with a secondary refining process such as Ar gas bubbling in a ladle or RH degasser treatment before pouring molten steel into the mold, the inclusion problem is not essential to perform high-speed casting.…”

Section: Endogenous Inclusions In Molten Steelmentioning

confidence: 99%

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Suzuki

Nakada

2001

ISIJ International

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Two decades ago the casting speed of the conventional slab continuous caster was increased stepwise to a level over 2 m/min. Henceforth, the casting speed has been remained a similar level. In this review the reasons for constraining the casting speed are discussed. As a result the constraints of the high-speed casting are thought mold powder entrapment and longitudinal facial crack occurring in high-speed casting.Some measures to prevent the mold powder entrapment and the longitudinal facial crack are discussed. Resultantly the research issues we should develop are considered such as prevention of alumina built-up in a submerged entry nozzle, control of fluid flow in a mold and control of heat transfer through mold powder film interved between a solidifying shell and a mold wall. They are most important to realize the high-speed continuous casting of conventional slab.KEY WORDS: high-speed casting; conventional slab; mold powder entrapment; longitudinal facial crack; upper limit of casting speed.order to realize the ideal process, i.e., full hot direct rolling, technologies for more stability of the casting practice and the production of higher slab quality should be realized.The casting speed of the conventional slab caster with an oscillating mold has been remained a 2 m/min level because such higher-speed casting deteriorates slab quality. Therefore, we will investigate what the factors for restraining the casting speed of the conventional slab caster are. Present State of High-speed Continuous Casting of Steel Slab Trend of Casting Speed of Conventional SlabContinuous Caster We will survey the present state of high-speed casting in a conventional slab caster. The trend of the casting speed is shown in Fig. 3 10) for the conventional slab casters in Japanese steel companies. The main specifications and the casting speed are listed in Table 1 of the conventional slab casters. [11][12][13][14][15][16][17][18] The casting speed has been stepwise increased and attained approximately twice in two decades. Fifteen years ago a synchronized operation began between a continuous caster and a hot strip mill, i.e., hot direct rolling. 19) Since the hot direct rolling operation needs the productivity of the caster to be met to that of the hot strip mill, the casting speed should be increased. Heat Transfer and Lubrication Phenomena inContinuous Casting Mold at High-speed Casting The infiltration of liquid powder into a shell/mold gap is a very important process in continuous casting since it is necessary to ensure both good lubrication and uniform heat transfer between a shell and a mold. Failure to provide these conditions could result in the creation of surface defects and sticker breakouts.We will survey the heat transfer and the lubrication phenomena in a mold at a casting speed over 2 m/min of slab casters.Local heat flux in casting of low carbon Al killed steel is shown in Fig. 4 20) against the remaining time in a mold. The local heat flux during the conventional slab casting given by Suzuki et al.,21) and Grilles...

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Section: Endogenous Inclusions In Molten Steelmentioning

confidence: 99%

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Suzuki

Nakada

2001

ISIJ International

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“… Theoretical method can give mathematical expressions only for some very simple electromagnetic or metallurgical conditions . Because electromagnetic metallurgy always involve multi‐physics coupling, it is difficult for us to get analytical solution. Numerical simulation can give the detailed information about the electromagnetic metallurgy process in the tundish with channel type induction heating . But some assumptions are introduced in the mathematical model because of the complexity of MHD phenomena.…”

Section: Introductionmentioning

confidence: 99%

Fluid Flow and Heat Transfer in a Tundish with Channel Type Induction Heating

Yang

Lei

et al. 2018

steel research int.

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Because of the high heating efficiency, channel type induction heating is utilized in the tundish in order to reduce the temperature fluctuations of the molten steel in the process of continuous casting. In order to have a deep insight into the complex MHD (magneto hydrodynamic) process in the tundish with channel type induction heating, water model and mathematical model are performed to describe the fluid flow and the heat transfer in the tundish. A non-isothermal water model with channel heater is built to investigate the thermal convection in the tundish. The electromagnetic force and Joule heating are introduced into the momentum equations and the energy conservation equation as a source term, and the coupled flow and temperature field are solved by the finite volume method. The results show that the predicted flow field and temperature field agree with the experimental data. In the case of channel type induction heating, there are two spiral flow in the channel due to electromagnetic force, and the temperature difference of molten steel is 12 C between the inlet and the outlet of the channel due to Joule heating.

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“…This process has been proved to show excellent performance of deoxidation and inclusion separation in plant trials. 1,2) The mechanism of inclusion separation in the rotation chamber has been experimentally and mathematically studied by Miki et al, 2,3) but the flow characteristic in a whole CF tundish containing the distribution chamber was not studied. In addition, Wang et al 4) have employed the large eddy simulation method to study the flow structure in the centrifugal flow tundish, their work mainly emphasized on how to enhance the swirling flow in rotation chamber, while the detailed flow characteristic in the distribution chamber was less mentioned.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of Flow Phenomenon in Centrifugal Flow Tundish

et al. 2009

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Fluid flow phenomenon in Centrifugal Flow (CF) tundish is investigated using water modeling and numerical simulation techniques. The effect of the dam spacing and rotation speed on the flow structure has been analyzed in detail. Results reveal that the bias flow, originating from the rotary outflow, leads to the formation of transversal circulation behind the dam. Such transversal flow can effectively diminish the conventional dead volume. Meanwhile, small dam spacing helps to produce a large-scale transversal circulation, and thus the prolonged flow path and relatively low velocity results in an increased plug volume. With the increase of dam spacing, the intensity of transversal circulation decreases and the increased fluid velocity causes a minished plug volume. The highest ratio of plug to dead volume is obtained under the dam spacing when transversal circulation is strongest. Furthermore, under lower magnetic intensities, the weaker fluid momentum leads to relatively large dead volume. With the increasing of magnetic intensity, the fluid mixing becomes better. However, much larger magnetic intensity will lead to decreased ratio of plug to dead volume. Therefore, a medium rotation speed (around 30 r/min) should be recommended.

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Inclusion Separation from Molten Steel in Tundish with Rotating Electromagnetic Field

Cited by 14 publications

References 2 publications

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Fluid Flow and Heat Transfer in a Tundish with Channel Type Induction Heating

Numerical and Experimental Analysis of Flow Phenomenon in Centrifugal Flow Tundish

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