Melt flow and heat transfer at the crater end of round billet continuous casting using final electromagnetic stirring

被引：0

作者：

Li S.-X. ^{[1
]}

Wang P. ^{[1
]}

Lan P. ^{[1
]}

Liu H.-S. ^{[1
]}

Liu Q.-L. ^{[2
]}

Li S.-G. ^{[2
]}

Zhang J.-Q. ^{[1
]}

机构：

[1] School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing

[2] Baoshan Iron & Steel Co.,Ltd., Shanghai

来源：

Gongcheng Kexue Xuebao/Chinese Journal of Engineering | 2019年 / 41卷 / 06期

关键词：

Electromagnetic field; F-EMS; Heat transfer; Melt flow in mushy zone; Round billet continuous casting;

D O I：

10.13374/j.issn2095-9389.2019.06.006

中图分类号：

学科分类号：

摘要：

Final electromagnetic stirring (F-EMS) is widely used in the billet and bloom continuous casting process because it effectively improves the as-cast quality. Numerous industrial trials on F-EMS have been conducted; however, the real melt flow and heat transfer characteristics at the crater end remain unclear. In this study, based on a round billet special steel continuous casting process, a coupled three-dimensional numerical model was developed to describe the F-EMS phenomenon. The flow and solidification behavior of the melt in the F-EMS region were obtained by a segmentation calculation model, and the Darcy source term method was employed to suppress the velocity within the mushy region. The effect of stirring current intensity and frequency on the electromagnetic field, melt flow, and heat transfer was investigated numerically. The model was validated using the measured data of magnetic flux density in the stirrer center and the strand surface temperature. According to the simulation results, with every 100 A increase in the current intensity, the maximal magnetic flux density increases by 19.05 mT. The electromagnetic force significantly increases with the increase in current intensity. With the increase in current frequency within 20-40 Hz, the magnetic flux density decreases slightly, whereas the electromagnetic force increases. Moreover, a swirling flow field in the stirrer region is observed under the rotary electromagnetic force, and the tangential velocity of melt increases with the increase in current intensity and frequency. Additionally, the swirling flow enhances the local melt heat transfer at the radial direction of the round strand. As the current intensity and frequency increase, the temperature of the melt in the liquid core decreases, and the center solid fraction at the F-EMS-implemented position increases accordingly. © All right reserved.

引用

页码：748 / 756

页数：8

共 20 条

[1]

Mao B., Zhang G.F., Li A.W., Theory and Technology of Electromagnetic Stirring for Continuous Casting, (2012)

[2]

Ayata K., Mori T., Fujimoto T., Et al., Improvement of macrosegregation in continuously cast bloom and billet by electromagnetic stirring, Trans Iron Steel Inst Jpn, 24, 11, (1984)

[3]

Mizukami H., Komatsu M., Kitagawa T., Et al., Effect of electromagnetic stirring at the final stage of solidification of continuously cast strand, Tetsu-to-Hagané, 70, 2, (1984)

[4]

Suzuki K., Shinsho Y., Murata K., Et al., Hot model experiments on electromagnetic stirring at about crater end of continuously cast bloom, Trans Iron Steel Inst Jpn, 24, 11, (1984)

[5]

Oh K.S., Chang Y.W., Macrosegeregation behavior in continuously cast high carbon steel blooms and billets at the final stage of solidification in combination stirring, ISIJ Int, 35, 7, (1995)

[6]

Wang B., Xie Z., Jia G.L., Et al., Parameter determination and effects on center segregation of F-EMS, Iron Steel, 42, 3, (2007)

[7]

Ge L., Zeng Y.N., Wang C.Y., Et al., Optimization of F-EMS parameters of bloom continuous casting, Steelmaking, 31, 1, (2015)

[8]

Wang B., Chen L., Zhang X., Et al., Study and application of the F-EMS position for the special steel bloom continuous casting, Contin Cast, 41, 5, (2016)

[9]

Zhou L., Gao S.C., Jiang D.C., Et al., Optimization on F-EMS position and casting parameters of billet caster, Steelmaking, 34, 2, (2018)

[10]

Ding N., Bao Y.P., Sun Q.S., Et al., Location determination of final electromagnetic stirring and its effect on central carbon segregation for SWRH82B steel, J Univ Sci Technol Beijing, 33, 1, (2011)

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