Metallurgical Effects of a Novel Tundish Refining Process for High-Strength Low-Alloy Hot-Rolled Plate Steels

Isayev, Oleg; Kislitsa, V. V.; Zhang, C.; Wu, Keyan; Hress, O.

doi:10.1007/s11015-016-0204-z

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…High alumina refractories (> 72 mass% Al 2 O 3 ) are widely used in equipment for refining and casting special steels and alloys. [6][7][8] Mullite synthesis from oxides is an important refractory industry process (sinter-mullite). Although the issues of crystal chemistry and the properties of mullite (the main phase of these products) have been studied quite intensely, 2,[9][10][11][12][13] the information on synthesis kinetics [14][15][16][17] is not sufficient.…”

Section: Introductionmentioning

confidence: 99%

Mullite Synthesis Kinetics from Polydispersed Vibration-Milled Wastes of Commercial Corundum in the Presence of High-Silica Melt: Experimental and Modelling Results

Pruttskov

Sokol’skii

Bachurskyi

et al. 2021

JOM

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The experimental kinetic data of mullite synthesis using commercial regular corundum vibration-milled wastes and silica by isothermal heat treatment were studied. The principle of diffusion flux symmetry to a convex surface was applied to perform theoretical analysis of partially and fully immersed quasispherical polydispersed particle interaction with a liquid phase (PAFIQPP method) to further derive the kinetic equations of mullite synthesis in the range of conversion degrees 0< a< 0.75-0.85 assuming corundum dissolution as a limiting stage in the molten silicate. The rate constants and activation energy of the process were calculated and adequately approximated by the PAFIQPP method experimental data: the rate constant growth from 3.3 9 10 -8 cm s À1 to 9.2 9 10 À8 cm s À1 was observed in the temperature range 1350-1500°C; the activation energy was 160 kJ/mol.

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Section: Introductionmentioning

confidence: 99%

Mullite Synthesis Kinetics from Polydispersed Vibration-Milled Wastes of Commercial Corundum in the Presence of High-Silica Melt: Experimental and Modelling Results

Pruttskov

Sokol’skii

Bachurskyi

et al. 2021

JOM

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“…Some of the non-metallic inclusions flow through the filter, while other of the non-metallic inclusions adhere to the filter surface due to adsorption process, which was described in work [8]. Tests of liquid steel filtration process in tundish were performed in works [9][10][11][12][13][14][15]. In all tested cases, the use of a filter in a tundish caused a reduction in the content of non-metallic inclusions in the liquid steel.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, dam with filter holes can be integrated with another FCD, what was presented in works [14,15]. The integration of two dams (which generate reaction chamber) with filter holes and bottom argon lance can provide the reduction of non-metallic inclusions in liquid steel by 2-2.5 times related to tundish without FCD.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Bartosiewicz¹,

Cwudziński²

2019

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In this work, the authors proposed a modification of the working space one-strand tundish adapted for slab casting process. Numerical simulations of liquid steel flow in the considered flow reactor were performed. The tundish is equipped with a dam with a multi-hole filter. Two variants of the filter hole arrangement were tested and their effect on the liquid steel flow hydrodynamic structure in the tundish was examined. The computer calculations results were verified by performing experiments on the water model. The result of numerical and physical simulations an RTD (Residence Time Distribution) type F curve was generated, which define the transition zone between the cast steel grades during the sequential casting process. The results of the researches showed that the modification of a dam with a multi-hole filter affects on the formation of the liquid steel flow hydrodynamic structure and the transition zone. Furthermore, examinations of the liquid steel refining ability in the considered tundish were carried out. The influence of the filter holes arrangement on the non-metallic inclusions flotation process to the slag phase and liquid steel filtration processes was checked. Numerical simulations were performed in the Ansys-Fluent computer program.

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“…Because steel grades require an increasingly high degree of purity, particularly for micro-inclusions with sizes of 1 µm to 50 µm, the tundish must be able to remove the micro-inclusions in the steel [19][20][21][22][23]. Unfortunately, the currently used tundishes and in particular the tundish used for high casting speed caster, cannot remove the micro-inclusions effectively [24][25][26][27]. For a more effective micro-inclusions' removal, the novel Multi-Hole-Double-Baffles (MHDB) device was developed, and the inclusion removal mechanism should be studied to improve the MHDB.…”

Section: Introductionmentioning

confidence: 99%

Removal Mechanism of Microscale Non-Metallic Inclusions in a Tundish with Multi-Hole-Double-Baffles

Jin

Dong

et al. 2018

Metals

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To effectively remove microscale inclusions in the tundish, the Multi-Hole-Double-Baffles (MHDB), a novel flow control device in the tundish for continuous casting, was developed. The hole array mode of the MHDB will directly affect the trajectories of the inclusions. The effect and removal mechanism of the inclusions with sizes of 1 µm to 50 µm in the tundish with MHDB were studied by numerical simulation. The hole array mode of MHDB could affect the inclusions' trajectories and distribution, and the mechanism underlying the effect of the MHDB was investigated using the discrete phase model (DPM). A 1:2.5 physical model was built to verify the accuracy of numerical simulation. The results showed that micro-inclusions were primarily driven by the drag force exerted by the molten steel flow, micro-inclusion trajectories followed the molten steel streamlines almost exactly, but buoyancy still played a role in the removal of the micro-inclusions near the molten steel surface; the hole array mode affected the trajectories of the micro-inclusions and controlled and decelerated the flow of molten steel, increasing the residence time of the molten steel flow a the value that is 15 times larger than the theoretical value; and "upper-in-lower-out" type MHDB showed the most efficient removal of micro-inclusions, with the removal rate being increased by 13-49% compared to the removal rates for the other type MHDB. The results of numerical simulation were well verified by physical simulation.

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Metallurgical Effects of a Novel Tundish Refining Process for High-Strength Low-Alloy Hot-Rolled Plate Steels

Cited by 3 publications

References 10 publications

Mullite Synthesis Kinetics from Polydispersed Vibration-Milled Wastes of Commercial Corundum in the Presence of High-Silica Melt: Experimental and Modelling Results

Mullite Synthesis Kinetics from Polydispersed Vibration-Milled Wastes of Commercial Corundum in the Presence of High-Silica Melt: Experimental and Modelling Results

Archives of Metallurgy and Materials

Removal Mechanism of Microscale Non-Metallic Inclusions in a Tundish with Multi-Hole-Double-Baffles

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