Influence of Inclusions Modification on Nozzle Clogging

Lamut, Jakob; Falkus, J.; Jurjevec, B.; Knap, M.

doi:10.2478/v10172-012-0029-0

Cited by 17 publications

(12 citation statements)

References 6 publications

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“…However, Mg treatment can easily cause liquid steel spatter. Ca treatment is commonly used to modify high melting point Al 2 O 3 inclusions into fully or partially liquid calcium aluminates to diminish the clogging of the submerged entry nozzle during the continuous casting process [21]. However, either insufficient or excessive addition of calcium alloys is detrimental because incomplete or superfluous calcium can lead to the formation of solid CaO, CaS, calcium alumina, and other unfavorable inclusions deteriorating the quality of the steel [22,23].…”

Section: Introductionmentioning

confidence: 99%

Effect of adding yttrium on precipitation behaviors of inclusions in E690 ultra high strength offshore platform steel

Yang

et al. 2020

High Temperature Materials and Processes

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The mechanism of inclusions precipitation of the E690 offshore platform steel, with and without addition of yttrium, was studied using the thermodynamic calculation method. The results show that in the E690 steel in the absence of yttrium, the MnS inclusions were precipitated in the liquid phase at the solidification front. By adding the yttrium, MnS inclusions were replaced by spindle and spherical yttrium-containing oxide and sulfide complex inclusions, and the precipitation sequence of yttrium-containing inclusions in the liquid steel was Y2O3, Y2O2S, and YS. However, Y2S3 inclusions cannot be precipitated in the liquid steel under the experimental conditions. It was also found that Al2O3 inclusions can be formed in the liquid steel with and without addition of yttrium. The thermodynamic calculation results are in accordance with the experimental results.

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Section: Introductionmentioning

confidence: 99%

Effect of adding yttrium on precipitation behaviors of inclusions in E690 ultra high strength offshore platform steel

Yang

et al. 2020

High Temperature Materials and Processes

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“…• Slag entrapment, • SEN erosion [4]. The measurement of mould flux viscosity is usually conducted for an average temperature of 1300°C.…”

Section: Mould Flux Propertiesmentioning

confidence: 99%

“…In the casting process, a change in the mould flux viscosity is usually caused by a change in the Al 2 O 3 content. Changes in the Al 2 O 3 content are caused by various effects, but the most important are oxygen inclusions floating to the slag from the steel [4,5] and the reaction of Al dissolved in the steel with SiO 2 , as follows:…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of the Stability of Mould Flux Properties in the Process of Continuous Steel Casting

Falkus

2017

Archives of Metallurgy and Materials

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This paper presents research on the mould slag formed on the basis of two mould fluxes. In the conducted industrial experiments, slag was sampled in equal time intervals between adding subsequent portions of mould flux. The research focused on the an evaluation of the stability of slag parameters by assessing the change in its liquidus temperature. It was shown that a mould flux needs to be assessed individually taking into account the casting process parameters and the steel cast grade.

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“…However, the efficiency of inclusion removal by simple flotation in the tundish is generally limited by the residence time of liquid metal as it flows through a tundish and the rise velocity of the buoyant particles. The rise velocity of a particle is a function of its size, smaller particles are harder to remove [6][7][8]. The flow pattern is also affected by the steel flow rate and its temperature distribution.…”

Section: Introductionmentioning

confidence: 99%

“…Flow in the tundish is greatly affected by the ladle-tundish nozzle geometry and gas in the ladle stream. Problems related to surface turbulence can be reduced by avoiding excessive argon levels in the ladle stream and by using fully-shrouded and immersed nozzles [5][6][7]. Empirical studies of the liquid metal flow in the tundish, due to the high temperatures and a lack of optical access, are almost impossible.…”

Section: Introductionmentioning

confidence: 99%

Effect Of Steel Flow Control Devices On Flow And Temperature Field In The Tundish Of Continuous Casting Machine

Sowa¹

2015

Archives of Metallurgy and Materials

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The mathematical model and numerical simulations of the liquid steel flow in a tundish are presented in this paper. The problem was treated as a complex and solved by the finite element method. One takes into consideration in the mathematical model the changes of thermophysical parameters depending on the temperature. The single-strand tundish is used to casting slabs. The internal work space of the tundish was modified by flow control devices. The first device was a pour pad situated in the pouring tundish zone. The second device was a dam. The third device was a baffle with three holes. The dam and baffle were placed in the tundish at different positions depending on the variant. The main purpose of using these was to put barriers in the steel flow path as well as give directional metal flow upwards which facilitated inclusion floatation. The interaction of flow control devices on hydrodynamic conditions was received from numerical simulations. As a result of the computations carried out, the liquid steel flow and steel temperature fields were obtained. The influences of the tundish modifications on the velocity fields in liquid phase of the steel were estimated, because these have essential an influence on high-quality of a continuous steel cast slab.Keywords: Numerical simulation, molten metal flow, continuous casting, tundish W pracy przedstawiono model matematyczny i wyniki symulacji numerycznych przepływu ciekłej stali w kadzi pośredniej urządzenia ciągłego odlewania. Zadanie potraktowano kompleksowo rozwiązując go metodą elementów skończonych. Uwzględniono zmianę parametrów termofizycznych od temperatury. Do rozważań wybrano jednowylewową kadź pośrednią przeznaczoną do odlewania wlewków płaskich. Przestrzeń robocza kadzi pośredniej była modyfikowana i zabudowywana urzą-dzeniami sterującymi przepływem ciekłej stali. Pierwszym urządzeniem była kształtka podwylewowa umieszczona w strefie zasilania kadzi pośredniej. Drugim urządzeniem była tama a trzecim przegroda z trzema oknami przelewowymi. Tama i przegroda były umiejscawiane zamiennie w różnych położeniach zależnie od wariantu. Głównym celem zastosowania tych modyfikacji było wymuszenie spokojnego mieszania cieczy metalicznej oraz ukierunkowanie płynięcia metalu w górę, które wspomaga flotacyjne unoszenie wtrąceń do warstwy żużla. Wpływ zastosowanych w kadzi pośredniej urządzeń sterujących na warunki hydrodynamiczne przepływu ciekłej stali oceniano na podstawie symulacji komputerowych. W wyniku obliczeń numerycznych otrzymano pola prędkości i temperatury ciekłej stali. Analizowano wpływ modyfikacji wnętrza kadzi na rozkłady prędkości w fazie ciekłej stali, które mają istotny wpływ na jakość wlewka ciągłego odlewania.

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Influence of Inclusions Modification on Nozzle Clogging

Cited by 17 publications

References 6 publications

Effect of adding yttrium on precipitation behaviors of inclusions in E690 ultra high strength offshore platform steel

Effect of adding yttrium on precipitation behaviors of inclusions in E690 ultra high strength offshore platform steel

An Evaluation of the Stability of Mould Flux Properties in the Process of Continuous Steel Casting

Effect Of Steel Flow Control Devices On Flow And Temperature Field In The Tundish Of Continuous Casting Machine

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