Application of a Swirling Flow Producer in a Conventional Tundish during Continuous Casting of Steel

Ni, Peiyuan; Jonsson, Lage; Ersson, Mikael; Jönsson, Pär G.

doi:10.2355/isijinternational.isijint-2017-377

Cited by 16 publications

(19 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is due to that the swirling flow in the SEN is not completely axisymmetric, as shown in Figure 1. However, the flow symmetry can be further improved by the cylindrical tundish design, such as using two tangential inlets in the cylindrical tundish in Figure 1a, which was investigated in a previous study [67]. For the study on M-EMS application, it was also found that the distribution of the electromagnetic force is not uniform in space [33].…”

Section: Concluding Discussionmentioning

confidence: 99%

“…A new cylindrical tundish design that produces a swirling flow in the SEN by using the steel flow potential has been investigated both by water model experiments and numerical simulations [47][48][49]61,67]. This study was the first to try to investigate the influence of such swirling flow tundish design on the steel flow, heat transfer, inclusion motion, and steel/slag interface stability in the mold.…”

Section: Concluding Discussionmentioning

confidence: 99%

“…Swirling flow normally shows a certain swirl frequency [67,68], which means that the transient flow characteristics may not be axisymmetric. Therefore, a transient solver is recommended to solve this kind of flow phenomena.…”

Section: Concluding Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Ersson

Jonsson

et al. 2018

Metals

Self Cite

View full text Add to dashboard Cite

The effect of a new cylindrical swirling flow tundish design on the multiphase flow and heat transfer in a mold was studied. The RSM (Reynolds stress model) and the VOF (volume of fluid) model were used to solve the steel and slag flow phenomena. The effect of the swirling flow tundish design on the temperature distribution and inclusion motion was also studied. The results show that the new tundish design significantly changed the flow behavior in the mold, compared to a conventional tundish casting. Specifically, the deep impingement jet from the SEN (Submerged Entry Nozzle) outlet disappeared in the mold, and steel with a high temperature moved towards the solidified shell due to the swirling flow effect. Steel flow velocity in the top of the mold was increased. A large velocity in the vicinity of the solidified shell was obtained. Furthermore, the risk of the slag entrainment in the mold was also estimated. With the swirling flow tundish casting, the temperature distribution became more uniform, and the dissipation of the steel superheat was accelerated. In addition, inclusion trajectories in the mold also changed, which tend to stay at the top of the mold for a time. A future study is still required to further optimize the steel flow in mold.

show abstract

Section: Concluding Discussionmentioning

confidence: 99%

Section: Concluding Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Ersson

Jonsson

et al. 2018

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, Yang et al found that the swirling flow could force the inclusions to move toward the rotational center and enhance the separation of inclusions from the molten steel to the mold meniscus. Many researchers have been making a lot of efforts to find ways to produce a swirling flow in the SEN . Yokoya et al first proposed the concept of swirling flow in the SEN for steel casting, which could introduce a swirl to the molten steel flowing in the SEN with the swirl blade installed in the SEN.…”

Section: Introductionmentioning

confidence: 99%

“…However, it required to completely redesign the whole tundish system. A device was later designed to be installed in a conventional tundish to produce the swirling flow in the SEN without compromising the structure of the conventional tundish . Nevertheless, the device was too large that was uneconomic.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Effect of a Novel Swirling Flow Generator for Submerged Entry Nozzle in Tundish

Yan

Yang

et al. 2020

steel research int.

View full text Add to dashboard Cite

The swirling flow in the submerged entry nozzle (SEN) is found to significantly improve the flow pattern in the mold, as well as the quality of the steel products. However, the devices generating swirling flow designed so far are mostly limited to be applied in the industries due to the cost, lifetime, external facility, and so on. Herein, a novel swirling flow generator (SFG) is intended to be installed in the conventional tundish to generate a swirling flow in the SEN driven by the gravitational potential energy of the molten steel. The computational fluid dynamics (CFD) simulations are performed to investigate the effects of the SFG by comparing the flow pattern in the conventional tundish. The result shows that a swirling flow is produced in the SEN without bringing a serious disturbance to the flow distribution in the tundish. The flow in the SEN becomes much even by adopting the SFG and the swirling velocity is found to decrease with the increasing distance from the bottom of the tundish. A parameter called swirling intensity is proposed to quantitatively evaluate the intensity of the swirling in the SEN.

show abstract

A Review on Swirling Flow Casting Technology in Steel Production

Xie

Nabeel

Ersson

et al. 2021

steel research int.

Self Cite

View full text Add to dashboard Cite

Casting is the final step of steel from liquid to solid state with a decreased steel temperature, where some complex phenomena occur in casting mold, as shown in Figure 1, [1] such as multiphase flow, heat transfer, phase transition, solute redistribution, and so on. During solidification process, some defects of steel semi-product like cracks and macrosegregation can form, which can significantly deteriorate steel mechanical properties. These defects normally are difficult to be completely removed in a subsequent heat treatment process. Therefore, a good control on steel solidification process is of great significance for both steel quality and casting efficiency.Steel casting includes two routes, namely continuous casting and ingot casting. According to statistics from World Steel Association, the global output of crude steel in 2020 is around 1.878 billion tons, over 96.9% of which is produced through continuous casting process. [2] Therefore, continuous casting has become the main process in global steel production. However, ingot casting is still used today to produce, for example, some high-alloyed steel, large size round bloom, and so on, which also plays an important role in production of some steel categories. In past years, steel casting process especially continuous casting has made enormous progress. These are realized by optimizing the submerged entry nozzle (SEN) structure, [3][4][5] casting speed, [6][7][8] argon blowing in nozzle, [9][10][11] electromagnetic braking, [12][13][14] mold electromagnetic stirring (M-EMS), [15][16][17] second-cooling segment electromagnetic stirring (S-EMS), [18][19][20] final electromagnetic stirring (F-EMS), [21][22][23] and so on. To further improve the steel flow field in mold, as early as 1994, Yokoya et al. [24] first proposed the swirling flow nozzle casting technology, which aims to induce a rotational steel flow inside SEN. This rotational flow momentum can change SEN outlet flow pattern to avoid the formation of a jet flow in mold that is commonly observed in the case of the straight nozzle continuous casting. [24] Furthermore, it can also promote a uniform flow on the cross-section of SEN side port. Therefore, the mold flow pattern can be optimized as soon as steel moves into the mold. Plant trials have confirmed that this technology can effectively improve the quality of steel semi-product and alleviate the SEN side-port clogging in continuous casting. [25] In recent years, the swirling flow nozzle casting technology has attracted worldwide attention. A great number of studies have been carried out, as shown in Table 1, and these studies will be comprehensively introduced in Section 2 and 3 in this paper, including different realization technologies, main findings, and metallurgical effects. This aims to promote the understanding of multiphysical phenomena induced by the swirling flow. Also, new technology development and research progress on swirling flow steel casting will be summarized. Swirling Flow Continuous Casting Swirl Blade TechnologyIn 1994, Yoko...

show abstract

Application of a Swirling Flow Producer in a Conventional Tundish during Continuous Casting of Steel

Cited by 16 publications

References 50 publications

Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold

Numerical Study on the Effect of a Novel Swirling Flow Generator for Submerged Entry Nozzle in Tundish

A Review on Swirling Flow Casting Technology in Steel Production

Contact Info

Product

Resources

About