Three-dimensional FEM study of fluid flow in mould for beam blank continuous casting: influence of nozzle structure and parameters on fluid flow

Chen, W; Yz, Zhang; Zhu, L-G; Zhang, C J; Chen, Yunqian; Bx, Wang; Wang, C

doi:10.1179/1743281211y.0000000052

Cited by 15 publications

(17 citation statements)

References 4 publications

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“…A profundidade do jato foi analisada através da observação do comportamento do jato de tinta ao longo do molde, método semelhante ao aplicado por Chen et al [5]. Lee et al [6], Yang et al [3] e CHEN et al [4,5], destacam que os fluxos recirculatórios de aço na região da alma e da ponta da flange afetam o perfil de crescimento da pele sólida do beam blank, e assim, o crescimento da pele sólida nas regiões do filete é mais lento nos estágios iniciais da solidificação.…”

Section: Profundidade Do Jatounclassified

“…Lee et al [6], Yang et al [3] e CHEN et al [4,5], destacam que os fluxos recirculatórios de aço na região da alma e da ponta da flange afetam o perfil de crescimento da pele sólida do beam blank, e assim, o crescimento da pele sólida nas regiões do filete é mais lento nos estágios iniciais da solidificação. Da mesma forma, o crescimento da pele sólida nas regiões do filete e do centro da flange é retardado devido ao impingimento do fluxo de aço da válvula submersa sobre a pele sólida.…”

Section: Profundidade Do Jatounclassified

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Análise Do Fluxo Em Molde De Lingotamento Contínuo De Beam Blank: Simulação Computacional E Física

Peixoto¹,

Gabriel²,

Ribeiro³

et al. 2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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ResumoO movimento do fluido no interior do molde durante o processo de lingotamento contínuo possui grande impacto na qualidade do produto fabricado, pois influencia os mecanismos de formação da casca solidificada, flotação de inclusões e lubrificação da pele. A geometria complexa dos moldes de Beam Blank dificulta a garantia de fluxos térmicos simétricos, o que resulta em variação na espessura da pele; daí a importância de se estudar os parâmetros que interferem no fluxo do fluido no interior do molde. Neste trabalho verificou-se a influência da velocidade de lingotamento e do diâmetro de válvulas submersas do tipo tubulares sobre o fluxo no interior do molde. A análise do campo vetorial de velocidades revelou a existência de seis vórtices, dois na região da alma e dois em cada flange do molde. Além disso, foi encontrado que o aumento de 100L/min a 150L/min a profundidade do jato sobe de 0,74m para 0,84m, enquanto que um aumento de 67% na área de seção transversal das válvulas tubulares não promove diminuição significativa desta profundidade. Palavras-chave: Beam blank; Fluxo; Lingotamento contínuo; Near net shapes. FLUID FLOW ANALYSIS IN MOULD FOR BEAM BLANK CONTINUOUS CASTING: COMPUTATIONAL AND PHYSICAL SIMULATION AbstractThe fluid flow inside the mould during Continuous Casting has a great effect on product quality affecting the formation of solid shell, inclusions flotation as well as skin lubrication. The complex geometry of Beam Blank moulds can make difficult to guarantee the thermal flow symmetry resulting in thickness variation of the solidified skin. Therefore, it is important to study the influence of parameters on fluid flow inside the mould. This paper aimed to verify the influence of casting velocity likewise the diameter of the Straight Through Conduit type SEN. Six vortices were observed in the mold, two vortices near the web and two in each flange. Furthermore, increase the fluid flow of 100L/min to 150L/min promotes variation from 0,74m to 0,84m at the depth jet, but increase of 67% area of the cross section of the Straight Through Conduit type SEN didn't cause significant variation in this parameter.

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Section: Profundidade Do Jatounclassified

Análise Do Fluxo Em Molde De Lingotamento Contínuo De Beam Blank: Simulação Computacional E Física

Peixoto¹,

Gabriel²,

Ribeiro³

et al. 2017

Anais Do Seminário De Aciaria, Fundição E Metalurgia De Não-Ferrosos

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“…One of them also accounts for the use of a multi-port nozzle, up to three ports, one pointing towards the mould center and two at 120° from each other, pointing towards the mould narrow faces. 8) Nevertheless, also with this particular geometrical feature two symmetric nozzles are foreseen. Of course, the use of two nozzles, placed at centre section half-way between flange tips ('triple point'), brings about a particular lay-out arrangement to couple tundish and mould feeding, different from casters of other as-cast shapes.…”

Section: Technical Approach and Modelling Descriptionmentioning

confidence: 99%

Modelling-based Innovative Feeding Strategy for Beam Blanks Mould Casting Aimed at As-cast Surface Quality Improvement

et al. 2014

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Within an investigation focused on effect of casting conditions on steel quality in an industrial beam blanks mould, different nozzle geometries were tested with Computational Fluid Dynamics modelling. The innovative nature of the work consisted in feeding with only one nozzle, whereas two nozzles in the flange-tip zone are commonly used. This configuration has the advantage of a simplified mono-slide gate casting layout, but single nozzle feeding can bring about risks of too high steel velocity in the mould, harmful for shell integrity and meniscus stability.Having in mind the mentioned constraints, different geometry solutions were checked and, to assess the solutions found, suitable indices were defined, related to flow conditions able to prevent slag entrapment at the meniscus, and hot-spotting at walls, harmful for the solid shell integrity.The modelling work gave general indications on undesired flow features and guidelines to improve reference conditions, involving number of holes and holes angle, size and shape. For the caster mould and the operating conditions under concern, a solution was found satisfying the indices, and expected to fulfil the quality requests. It consisted of a nozzle with a 50 mm diameter throat, a 50 mm× 60 mm elliptical lateral port inclined 25° downwards and a 20 mm-diameter bottom hole. A water model check with such a nozzle prototype validated the model supporting the solution identified to be used on plant.KEY WORDS: beam blanks; flow field; nozzle; cracks; shell remelting; slag entrapment. ForewordIn continuous casting of beam blanks, the occurrence of longitudinal surface cracks plays a relevant role in affecting as-cast quality. Not so many studies on surface crack occurrence in beam blanks are shown in literature. Lee and others, 1) within the as-cast beam blank shape (Fig. 1) identified the web and fillet region as mostly prone to crack formation, also noticing that shell formation is somewhat retarded at the flange-center region, due to the steel stream impingement from the feeding nozzle. The conclusions were gained based on a suitably defined crack susceptibility coefficient. Furthermore, Seok and Yoon 2) investigated the effect of steel composition on longitudinal crack formation. The most relevant results were the identification of: a) a mostly sensitive crack susceptibility range of carbon contents (0.12-0.13 wt.%); b) the effect of casting speed on crack formation (a linear relationship). Then, Hibbeler et al., 3) performed a thorough 3D thermo-mechanical analysis of beam blank steel solidification without accounting for liquid metal flow. A coupled thermal-mechanical model of steel casting was applied to accurately simulate casting of steel beam blanks, validated with plant measurements. An efficient local-global numerical procedure is given to integrate a realistic elasticvisco-plastic phase-dependent constitutive model implemented into the commercial package ABAQUS, and insights are provided into the mechanisms of shell failure triggered first by a thinner she...

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“…Shen found that the formation of longitudinal surface cracks in the slab is related to the heat transfer and mold taper [5]. In previous studies, Chen et al developed a three-dimensional FEM to compute the flow field of molten steel in the beam blank mold and found that the most rational rake angle for the three lateral hole SEN is 9°and the SEN immersion depth is 200-250 mm when casting speed is 0.9-1.1 m·min À1 [6]. Chen et al conducted a transient thermo-mechanical FEM, analyzed the two-dimensional temperature and stress-strain fields of the solidification process in detail and search out the optimum cooling parameters [7].…”

Section: Introductionmentioning

confidence: 99%

Mold taper optimization for continuous casting of H-beam blanks

Chen

Yang

Zhu

et al. 2019

Metall. Res. Technol.

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The objective of this study is to optimize the mold taper for continuous casting of H-beam blanks. A thermo-mechanical coupled mathematical model was established to analyze the heat transfer, solidification, and shrinkage of the strand in the mold based on the multiple load step method. Based on the simulation results of the air gap distribution in the mold, the mold taper was optimized at selected points on the surface of H-beam blank mold by minimizing the air gap thickness and the best taper scheme was proposed. The results show that the original mold tapers are relatively larger and the optimum mold tapers are as follows: (1) taper at the flange surface: 0.81%/m; (2) taper at the narrow face: 0.68%/m; (3) taper at the fillet: À1.44%/m. The optimum mold size obtained from taper optimization was used in the actual continuous casting process and based on the results, it can be concluded that the optimum mold taper scheme proposed in this study reduced the formation of surface cracks in H-beam blanks.

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Three-dimensional FEM study of fluid flow in mould for beam blank continuous casting: influence of nozzle structure and parameters on fluid flow

Cited by 15 publications

References 4 publications

Análise Do Fluxo Em Molde De Lingotamento Contínuo De Beam Blank: Simulação Computacional E Física

Análise Do Fluxo Em Molde De Lingotamento Contínuo De Beam Blank: Simulação Computacional E Física

Modelling-based Innovative Feeding Strategy for Beam Blanks Mould Casting Aimed at As-cast Surface Quality Improvement

Mold taper optimization for continuous casting of H-beam blanks

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