Clogging In Continuous Casting Nozzles K. G. Rackers And B

The Influence of the Tundish Powder on Steel Cleanliness ...

The Influence of the Tundish Powder on Steel Cleanliness and Nozzle Clogging (English) Tapia, V. H. / Morales, R. D. / Camacho, J. / Lugo, G. / Iron & Steel Society; Steelmaking Division

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Physical Modeling of Asymmetrical Flow in Slab Continuous ...

Submerged Entry Nozzle (SEN) clogging is a serious problem for continuous casting process and slab quality. In order to investigate the impact of the SEN clogging rate on the flow field and the optimization effect of electromagnetic stirring (EMS) on the asymmetrical flow due to the SEN clogging, a 1:5 scaled mercury model, with various SEN clogging rates and different electromagnetic stirring ...

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Clogging in Continuos Casting Nozzle | Sintering | Heat ...

Nozzle clogging is a serious productivity and qua lity problem in continuous casting. This work reviews the causes, effects, and solutions to cloggi ng in continuous casting nozzles. The results of a one-dimensional, steady state analysis of the heat loss from the molten steel stream through the nozzle wall are discussed. The analyses show that steel may freeze within the clog matrix for a ...

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1-clogging-in-continuous-casting-nozzles-k-g-rackers-and-b-g-

To determine the relative importance of various phenomena, a number of additional models were. developed, as discussed below: 2.2.1 Nozzle Flow Model - The only measure of clogging during the cast is the slide gate or. stopper rod position. A crude model of the tundish nozzle, slide gate, and submerged entry nozzle was developed to quantify the relationship between slide gate position and ...

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Effect of Si and Ce Contents on the Nozzle Clogging in a ...

important reason for fast nozzle clogging during casting. 1. Introduction The field of clogging studies is very large. Here, clogging is accretion of material in the various parts of the continuous casting machine restricting the metal melt flow. The ... clogging studies. For example, Rackers and Thomas[1]

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Role of Solidification in Submerged Entry Nozzle Clogging ...

Jul 16, 2020· A submerged entry nozzle (SEN), a tube‐shaped device composed of refractory, is used to conduct molten steel from the tundish to the mold during continuous casting of steel. During the process, the SEN serves to protect the melt from oxidation and to stabilize the casting process.

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Effects of clogging, argon injection, and continuous ...

Abstract. The inter-related effects of nozzle clogging, argon injection, tundish bath depth, slide-gate opening position, and nozzle-bore diameter on the steel flow rate and pressure in continuous-casting slide-gate nozzles are quantified using computational models of …

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Free-surface Fluctuations For Design of Submerged-Entry …

The role of argon is to avoid SEN clogging. Regarding SEN clogging Rackers and Thomas [3] have studied and concluded that Nozzle clogging is a serious problem in continuous casting and affects productivity and quality of the final product. They discussed the causes, effects and solutions to clogging in continuous casting mold.

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TUNDISH NOZZLE CLOGGING - APPLICATION OF …

Clogging of the tundish nozzle is a major castability problem in continuous casting of steel for several reasons. Firstly, clogging increases the frequency of operation disruptions to change nozzles or tundishes or even to stop casting. These extra transitions increase operating cost, decrease productivity, and lower quality. Secondly, clogging can lead directly to a variety of quality problems.

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DEVELOPMENT OF NOZZLE CLOGGING INDEX TO ASSESS …

nozzle clogging rate, which is nothing but the rate of deposition taking place during a particular heat, can be used to assess the steel castability during continuous casting of steel. It is reported that there are more than 30 factors influencing the formation and of Al 2 O 3 and its entrapment in the liquid steel [11].

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Ladle Nozzle Clogging during casting of Silicon-Steel in ...

Sep 17, 2019· Abstract. To figure out the reason causing ladle nozzle clogging during a continuous casting process (or CC for short) for the silicon steel and get away to solve it, this paper studied the theoretical calculation of flow rates during casting, inclusions around the slide gate where ladle nozzle clogging happened, and Ca-treatment on refining units for producing the silicon steel.

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Effect of Nozzle Clogging on Surface Flow and Vortex ...

Effect of Nozzle Clogging on Surface Flow and Vortex Formation in the Continuous Casting Mold Seong-Mook Cho, Seon-Hyo Kim ... Previous researchers have studied the causes and effects of nozzle clogging in continuous casting. Rackers and Thomas classified the types of clogs as: agglomeration of deoxidation products, solid steel build up ...

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Clogging in Continuous Casting Nozzles - Projects - CCC ...

Clogging in Continuous Casting Nozzles. Keith Rackers and Brian Thomas. Continuous Casting Consortium. Turbulent fluid flow of molten steel through the tundish well and upper submerged entry nozzle region is important to nozzle clogging, in addition to flow in the mold. Clogging limits productivity, in addition to causing serious quality problems.

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(PDF) Nozzle clogging prediction in continuous casting of ...

Rackers, K.G. and B.G. Thomas (1995). Clogging of continuous casting nozzles. Steelmaking Conference Proceedinfs, pp. 723-734. DEVELOPMENT OF ALUMINA-GRAPHITE IMMERSION NOZZLE FOR CONTINUOUS CASTING.

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Modeling of Clogging and Erosion of Nozzle Refractories in ...

09 MST Araromi Sean Pitts PA Nozzleclog v9 - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Nozzle

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Ladle Nozzle Clogging during casting of Silicon-Steel ...

AbstractTo figure out the reason causing ladle nozzle clogging during a continuous casting process (or CC for short) for the silicon steel and get away to solve it, this paper studied the theoretical calculation of flow rates during casting, inclusions around the slide gate where ladle nozzle clogging happened, and Ca-treatment on refining units for producing the silicon steel.

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Effects of Clogging, Argon Injection and Casting ...

depends on the casting speed, tundish level, and nozzle bore diameter and is quantified in this work for a typical nozzle and range of conditions. INTRODUCTION Nozzle clogging is one of the most disruptive phenomena in modern continuous casting operation. Argon injection into the nozzle is widely employed to reduce nozzle clogging.

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Effects of clogging, argon injection, and continuous ...

The inter-related effects of nozzle clogging, argon injection, tundish bath depth, slide-gate opening position, and nozzle-bore diameter on the steel flow rate and pressure in continuous-casting slide-gate nozzles are quantified using computational models of three-dimensional (3-D) multiphase turbulent flow. The results are validated with measurements on operating steel continuous slab-casting ...

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Impact of addition of Ca on clogging of SEN and magnetic ...

The submerged entry nozzle (SEN) clogging has been happening during continuous casting (or CC for short) for non-oriented silicon steel. To solve the problem, the paper studied a flow rate through SEN, a node attached to one of them, and the impact on the clogging. The results showed that when SEN is clogged seriously, the casting speed has to ...

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Material Evaluation to Prevent Nozzle Clogging during ...

The continuous casting process accounts for 90% of the world’s steel output and is considered to be a mature tech-nology.1) The submerged entry nozzle (SEN) plays a vital role in ensuring stable casting operations and slab quality. It is used to prevent oxygen and nitrogen pick-up and to achieve a desired steel flow in the mould. Clogging of

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A transient model for nozzle clogging - MAFIADOC.COM

a b s t r a c t This model has been developed for transient simulation of clogging (also called as fouling) in submerged entry nozzle (SEN) during continuous casting. Three major steps of the clogging have been taken into account: (a) transport of non-metallic inclusions (NMIs) by turbulent melt flow towards the SEN wall; (b) interactions ...

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Collision‐controlled growth of composites in casting nozzles

Zhou Shu-cai, Study of the Clogging of the Submersible Nozzle in the Continuous Casting of Stainless Steel RE-253MA, Metallurgist, 10.1007/s11015-013-9761-6, 57, 5-6, (510-515), (2013). Crossref N Kojola, S Ekerot, M Andersson, P G Jönsson, Pilot plant study of nozzle clogging mechanisms during casting of REM treated stainless steels ...

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Estimation of Non-Metallic Inclusions in Steelmaking Emre ...

metallic inclusions give rise to nozzle clogging in continuous casting process, surface defects in rolling process and adverse effects on mechanical properties in final product. In ... K. G. Rackers, B. G. Thomas, Clogging in Continuous Casting Nozzles, 78th Steelmaking Conference Proceedings, Vol. 78, pp. 723-734,Iron and Steel Society, 1995, USA.

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US20080210719A1 - Continuous Casting Tundish - Google Patents

A tundish assembly, including an element, for preventing or limiting steel reoxidization in the continuous casting of molten steel, is used in combination with a refractory nozzle. The element has an orifice engaging the outer surface of the nozzle, a main surface surrounding the main orifice and having a lowest level lower than the top outer edge of the nozzle inlet portion, and a periphery ...

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Role of Solidification in SEN Clogging During Continuous ...

fractory material can postpone the clogging, thereby extending its service life. 1. Introduction A submerged entry nozzle (SEN), a tube-shape device composed of refractory, is used to conduct molten steel from the tundish to the mold during continuous casting of …

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Multiphase Flow-Related Defects in Continuous Casting of ...

Rackers KG (1995) Mechanism and mitigation of clogging in continuous casting nozzles. M.S. Thesis, University of Illinois Google Scholar. 20. Rege RA, Szekeres ES, Forgeng WD (1970) Met Trans AIME 1:2652 Google Scholar. 21. Zhang L, Aoki J, Thomas BG (2006) Inclusion removal by bubble floatation in a continuous casting mold.

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Effects of Clogging, Argon Injection, and Continuous ...

EQUILIBRIUM MODEL OF PRECIPITATION IN MICROALLOYED STEELS.pdf - Free download as PDF File (.pdf), Text File (.txt) or read online for free.

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Oleksiy Smirnov, Artem Kravchenko, Kostyantin Pismaryov ...

Incorporating an additional opening at the SEN bottom is employed in this study as one of the means for ensuring optimal fluid flow patterns in the nozzle and the mold. REFERENCES. K.G.Rackers, B.G.Thomas, Clogging in Continuous Casting Nozzles, 78th Steelmaking Conf. Proc., Warrendale, PA, Vol. 78 (1995), p. 723-734

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[PDF] Clogging in Continuous Casting | Semantic Scholar

Materials Science Nozzle clogging is a serious productivity and quality problem in continuous casting. This work reviews the causes, effects, and solutions to clogging in continuous casting nozzles. The results of a one-dimensional, steady state analysis of the heat loss from the molten steel stream through the nozzle wall are discussed.

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Alumina coatings on carbon bonded alumina nozzles for ...

Apr 01, 2013· Clogging, an unrequested phenomenon in continuous casting nozzles, is the build-up of material in the flow passage between the tundish and the mold. ... K.G. Rackers, B.G. Thomas, Clogging in continuous casting, in: Proceedings of the 78th Steelmaking Conference, Nashville, Iron and Steel Society, vol. 78, 1995, pp. 723–734.

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