Special Issue "Continuous Casting of Steel"

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 31 July 2018

Special Issue Editor

Guest Editor
Dr. Michael Vynnycky

Department of Materials Science and Engineering, The Royal Institute of Technology (KTH), Brinellvägen 23, 100 44 Stockholm, Sweden
Website | E-Mail
Interests: casting of metals; fluid mechanics; continuous casting

Special Issue Information

Dear Colleagues,

Continuous casting is a process whereby molten metal is solidified into a semi-finished billet, bloom, or slab for subsequent rolling in finishing mills; it is the most frequently used process to cast steel and, to a lesser extent, aluminum and copper. Since its widespread introduction for steel in the 1950s, it has evolved to achieve improved yield, quality, productivity and cost efficiency. It allows lower-cost production of metal sections with better quality, due to the inherently lower costs of continuous, standardized production of a product, as well as providing increased control over the process through automation. Nevertheless, challenges remain and new ones appear, as ways are sought to minimize casting defects and to continuously cast steel grades that could originally be cast only via ingot casting. For this Special Issue in Metals, we welcome reviews and articles in all aspects of experimental work and theoretical modelling related to the ongoing development of the continuous casting of steel.

Dr. Michael Vynnycky  
Guest Editor

Manuscript Submission Information

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Keywords

  • Continuous casting
  • Steel
  • Casting defects
  • Experiments
  • Theoretical modelling

Published Papers (3 papers)

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Research

Open AccessArticle Numerical Study on the Influence of a Swirling Flow Tundish on Multiphase Flow and Heat Transfer in Mold
Metals 2018, 8(5), 368; https://doi.org/10.3390/met8050368
Received: 30 April 2018 / Revised: 11 May 2018 / Accepted: 18 May 2018 / Published: 21 May 2018
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Abstract
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
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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. Full article
(This article belongs to the Special Issue Continuous Casting of Steel)
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Open AccessArticle Modelling on Inclusion Motion and Entrapment during the Full Solidification in Curved Billet Caster
Metals 2018, 8(5), 320; https://doi.org/10.3390/met8050320
Received: 12 April 2018 / Revised: 2 May 2018 / Accepted: 2 May 2018 / Published: 6 May 2018
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Abstract
Inclusions entrapped by the solidifying front during continuous casting would deteriorate the properties of the final steel products. In order to investigate the inclusion motion and the entrapment during the full solidification in curved billet caster, the present work has developed a three-dimensional
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Inclusions entrapped by the solidifying front during continuous casting would deteriorate the properties of the final steel products. In order to investigate the inclusion motion and the entrapment during the full solidification in curved billet caster, the present work has developed a three-dimensional numerical model coupling the flow, solidification, and inclusion motion. The predicted result indicates that the inclusion distribution inside the liquid pool of the mold is not perfectly symmetrical. Furthermore, the motion and the entrapment of micro inclusions in the mold are mainly affected by the molten steel flow pattern, however, those of macro inclusions depend both on the molten steel flow pattern and the buoyancy force of the inclusions. In the curved part of the strand, macro inclusions shift to the solidifying front of the inner radius as time goes on, while the solidifying front of the outer radius cannot entrap inclusions. The distributions of inclusions smaller than 5 μm in the solidified strand are even. However, for inclusions that are larger than 5 μm, their distributions become uneven. To validate the model, measurement of the strand surface temperature and the detection of inclusions in samples obtained from a plant have been performed. Good agreement is found between the predicted and experimental results. Full article
(This article belongs to the Special Issue Continuous Casting of Steel)
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Open AccessArticle A Combined Hybrid 3-D/2-D Model for Flow and Solidification Prediction during Slab Continuous Casting
Metals 2018, 8(3), 182; https://doi.org/10.3390/met8030182
Received: 11 December 2017 / Revised: 19 January 2018 / Accepted: 8 March 2018 / Published: 14 March 2018
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Abstract
A combined hybrid 3-D/2-D simulation model was developed to investigate the flow and solidification phenomena in turbulent flow and laminar flow regions during slab continuous casting (CC). The 3-D coupling model and 2-D slicing model were applied to the turbulent flow and laminar
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A combined hybrid 3-D/2-D simulation model was developed to investigate the flow and solidification phenomena in turbulent flow and laminar flow regions during slab continuous casting (CC). The 3-D coupling model and 2-D slicing model were applied to the turbulent flow and laminar flow regions, respectively. In the simulation model, the uneven distribution of cooling water in the width direction of the strand was taken into account according to the nozzle collocation of secondary cooling zones. The results from the 3-D turbulent flow region show that the impact effect of the molten steel jet on the formation of a solidification shell is significant. The impact point is 457 mm below the meniscus, and the plug flow is formed 2442 mm below the meniscus. In the laminar flow region, grid independence tests indicate that the grids with a cell size of 10 × 10 mm2 are sufficient in simulations to attain the precise temperature distribution and solidification profile. The liquid core of the strand is not entirely uniform, and the solidification profile agrees well with the integrated distribution of cooling water in secondary cooling zones. The final solidification points are at a position of 400–500 mm in the width direction and are 17.66 m away from the meniscus. Full article
(This article belongs to the Special Issue Continuous Casting of Steel)
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