Electromagnetic Control of Initial Solidification in Continuous Casting of Steel by Low Frequency Alternating Magnetic Field.

Toh, Takehiko; Takeuchi, Eiichi; Hojo, Masatake; Kawai, Hiroyuki; Matsumura, Shogo

doi:10.2355/isijinternational.37.1112

Cited by 49 publications

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“…Recently, the casting experiments showed that the quality of the billet surface became much better with SC-EMCC technology than with conventional continuous casting technology. [2][3][4] However, one of the key factors is the mold design for applying this SC-EMCC technology in steelmaking. The mold used in the SC-EMCC should achieve high magnetic penetrability and suitable cooling ability.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Field Distribution in Two-section Slitless Mold for Soft-contact Electromagnetic Continuous Casting

et al. 2009

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Field Distribution in Two-section Slitless Mold for Soft-contact Electromagnetic Continuous Casting

et al. 2009

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“…It has been known from laboratory experiments that the surface quality of cast steel is much improved by EMC. [3][4][5][6] And the magnetic frequency adopted in EMC ranges to wide area, from few hundreds hertz to several ten kilo-hertz. The authors have already confirmed the beneficial effects on the surface quality of cast billet using high frequency magnetic field of 20 kHz, 4) in the viewpoint of stabilization of meniscus which is greatly influenced by the ratio of magnetic skin depth to the characteristic length of the billet.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Billet Surface Quality by Ultra-high-frequency Electromagnetic Casting.

et al. 2002

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“…Although the electromagnetic force was calculated, but the deep analysis about it was not carried out. Application of low frequency electromagnetic field was researched in literature, 2) the frequency is aimed at 60 Hz. In literature, 3) the authors researched the effect of intermittent high frequency magnetic field on initial solidification, the frequency is fixed on 20 kHz.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Analysis and Numerical Simulation of High Frequency Electromagnetic Field in Soft Contact Continuous Casting Mold.

Xianzhao¹,

Zhang²,

Gan³

2002

ISIJ International

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The electromagnetic parameters in soft contact continuous casting billet mold were analyzed in this paper by mathematical analytic method and numerical simulation; the optimized frequency range was fixed on 20 000-40 000 Hz. The distribution of magnetic flux density and electromagnetic body force in split mold was obtained; the research results achieved respectively by mathematical analytic method and numerical simulation agree with each other. With increase of frequency of electromagnetic field, the electromagnetic body forces acted on the surface of strand increase, and attenuate rapidly towards the center of strand. When the meniscus was located at the middle of coil height, the electromagnetic body force acted on it is biggest, and then decreased along the casting direction to almost zero at the location of charge bottom. On the transverse direction perpendicular to the casting direction, the asymmetrical distribution of magnetic field at the surface of strand permeated through the slit of mold was enhanced slightly with the increase of frequency. The magnetic flux density at the slit area is about 10% higher than that at other area at 40 000 Hz, and the distribution of magnetic body force is almost even on this direction.KEY WORDS: soft contact solidification; electromagnetic continuous casting; mold; mathematical analytic method; finite element method; numerical simulation.fixed on 20 kHz. The authors of literature 4) investigated the shape of meniscus under 5-100 kHz, considered the frequency should be set above 20 kHz. Frequency was aimed at 20 kHz in literature, 5) and it was aimed at 25 kHz in literature, 6) but the reason of selection of frequency was not given out.In this paper, the distribution of electromagnetic field, action of electromagnetic body force permeating slit mold on strand, the decisive effect of frequency on soft contact solidification and optimal frequency range in billet slit mold are discussed here deeply. Theoretical FoundationThe most radical governing equation for electromagnetic field is Maxwell equations. Electromagnetic harmonic wave of definite frequency is emitted by high frequency power source in soft contact technology. Within conductor, rϭ0, J ជ ϭsE ជ where, r, density of free charge (C/m 3 ); J ជ , electric current density (A/m 2 ); s, electrical conductivity (S/m); E ជ , electric field intensity (V/m).The Maxwell equations of alternating electromagnetic field are obtained as: (7) where, B ជ , magnetic flux density (T); D ជ , electric displacement vector (C/m 2 ); H ជ , magnetic field intensity (A/m); m, magnetic permeability (H/m); e, dielectric constant (F/m).The electromagnetic body force imposed on conductor is described as: (13) where h f , residual percentage of electromagnetic field passing through mold wall, related to frequency; t, time (s).The attenuation curves without dimension of electromagnetic wave of different frequencies within 6 mm copper wall, 40 mm radius steel strand and round copper mold filled by liquid steel are shown respectively in Figs. 1, ...

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Electromagnetic Control of Initial Solidification in Continuous Casting of Steel by Low Frequency Alternating Magnetic Field.

Abstract: A markedimprovement of the surface quality of casts and a break-through

Cited by 49 publications

References 0 publications

Electromagnetic Field Distribution in Two-section Slitless Mold for Soft-contact Electromagnetic Continuous Casting

Electromagnetic Field Distribution in Two-section Slitless Mold for Soft-contact Electromagnetic Continuous Casting

Improvement of Billet Surface Quality by Ultra-high-frequency Electromagnetic Casting.

Mathematical Analysis and Numerical Simulation of High Frequency Electromagnetic Field in Soft Contact Continuous Casting Mold.

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