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Gyro Nozzle – An innovative Submerged Entry Nozzle Design for Billet and Bloom casting

Hackl, G.; Tang, Y.; Nitzl, G.; Schurmann, D.; Willers, B.; Eckert, S.

Mathematical simulations by means of CFD and physical models operated with liquid metal were utilized to investigate the flow characteristics obtained by the use of RHI-Magnesita’s Gyro nozzle in the mould region with a round cross section. The focus of this work was to characterize the interaction with a mold electro-magnetic stirrer (M-EMS) and compare the results with a conventional straight through SEN design. Even without the use of an electromagnetic stirrer the Gyro nozzle establishes a rotational flow in the mold. When a rotational magnetic field is applied the velocity profile at the meniscus is not severely affected. Strong fluctuations and the formation of vortices, as detected with a standard SEN, were not observed. In contrast, with increasing distance to the meniscus the rotational flow is stronger established when compared to the standard SEN, which should be beneficial in terms of the crystallization pattern of the solidified steel. The flow in general is more stable, independent of the operating conditions. Both modeling approaches show the same trend. Based on the obtained results it can be stated, that the Gyro nozzle shows a superior behavior over conventional straight through SEN designs for both the stirred and non-stirred case.

Keywords: CFD; liquid metal modeling; M-EMS; SEN; isostatically pressed products

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Publ.-Id: 27128