Steel Reoxidation by Gunning Mass and Tundish Slag

Yan, Pengxun; Arnout, Sander; Ende, Marie‐Aline Van; Zinngrebe, Enno; Jones, Tom Peter; Blanpain, Bart; Guo, Muxing

doi:10.1007/s11663-014-0287-5

Cited by 20 publications

(18 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Regarding a good steel cleanliness the usage of Al 2 O 3 GM presented better results, however the formation of larger alumina inclusions was observed with this gunning mass . A common point in studies under industrial and laboratory conditions is that the instable oxides FeO, MnO, and SiO 2 are the principal sources of oxygen during the tundish steelmaking . These oxides should be the lowest possible to decrease the oxygen provided by the gunning mass.…”

Section: Introductionmentioning

confidence: 84%

“…The presence of gunning mass (GM) is important in order to increase the refractory life of the tundish. This product could present different chemical compositions, and MgO or Al 2 O 3 based gunning mass are the most frequently used . The influence of MgO based gunning mass have been studied under industrial conditions.…”

Section: Introductionmentioning

confidence: 99%

“…The base material of the GM would be responsible for the type of inclusion formed, and the instable oxides would control the reactivity and oxidation capability of the material. The type of inclusion that could be formed needs to be evaluated depending on the grade of steel …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Laboratorial Analysis of Inclusions Formed by Reoxidation in Tundish Steelmaking

Alves

Pereira

Rocha

et al. 2018

steel research int.

View full text Add to dashboard Cite

In order to investigate the formation of inclusions by reoxidation in the tundish, an MgO-CaO gunning mass (GM1), an MgO gunning mass (GM2), a calcium aluminate tundish slag (TS), and a rice husk ash (RHA) silica based are evaluated. The interaction between the steel and these materials is analyzed under laboratory conditions. The experimental results for the chemical composition of steel and the types of inclusions formed satisfactory reach the thermodynamic equilibrium calculated by FactSage. GM1 presents better results for inclusion density and average size of inclusions compared to GM2. The experiment with TS presents a good steel cleanliness despite the formation of numerous alumina inclusions, caused by the reaction between the slag and the alumina crucible. The addition of RHA increases the inclusion density and average size of inclusions, and also the formation of CaO-Al 2 O 3 -SiO 2 oxides inclusions is favored. RHA has harmful effects concerning reoxidation events, deteriorating the good cleanliness obtained with the TS. The experiments with GM1 and TS are less reoxidative and presents a better steel cleanliness. Thus, the usage of this gunning mass and a calcium aluminate slag without RHA is preferable in order to diminish reoxidation during the tundish steelmaking.

show abstract

Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laboratorial Analysis of Inclusions Formed by Reoxidation in Tundish Steelmaking

Alves

Pereira

Rocha

et al. 2018

steel research int.

View full text Add to dashboard Cite

show abstract

“…O gás inerte de alta pureza empregado será o argônio, seguindo o padrão de todos os experimentos revisados. A função do gás inerte será de proteger o interior do forno e diminuir a pressão parcial de O2, a fim de se evitar possíveis eventos de reoxidação [30]. A pressão parcial no interior do forno foi estimada supondo passagem de gás argônio com 99,999% de pureza e 1 ppm de O2 em um volume de 4,4 L. Pela equação PV=nRT [31], foi calculado a pressão parcial de O2 em 1,08x10 -6 atm.…”

Section: Momento Adiçãounclassified

“…A pressão parcial no interior do forno foi estimada supondo passagem de gás argônio com 99,999% de pureza e 1 ppm de O2 em um volume de 4,4 L. Pela equação PV=nRT [31], foi calculado a pressão parcial de O2 em 1,08x10 -6 atm. Este valor é próximo ao encontrado em outro trabalho que utilizou sensores para realizar essa medição [30]. A temperatura escolhida para os experimentos foi de 1600°C.…”

Section: Momento Adiçãounclassified

Revisão E Planejamento De Experimentos Com Aço E Escória Em Forno De Laboratório Para O Estudo De Inclusões

Alves¹,

Rocha²,

Pereira³

et al. 2017

ABM Proceedings

View full text Add to dashboard Cite

ResumoA cada ano a demanda por aços limpos aumenta, tornando o controle de inclusões cada vez mais importante. Durante o refino secundário de aços, ocorrem a eliminação de impurezas, ajuste da composição química e ajuste da temperatura do aço líquido. A remoção de inclusões não-metálicas geralmente ocorre nessa etapa, sendo realizada pela escória. Neste trabalho, foi definido um planejamento de experimentos para que numa segunda etapa, os conhecimentos obtidos possam ser comparados e transferidos para a prática industrial. Inicialmente, foi feita uma revisão da literatura sobre experimentos realizados em fornos de laboratório com amostras de aços e escórias focados na remoção de inclusões. Depois de analisados diferentes arranjos experimentais propostos, alguns trabalhos selecionados foram analisados com respeito às inclusões e às escórias presentes. Finalmente, no planejamento proposto, definiu-se que os experimentos serão realizados em forno resistivo com passagem de argônio. As amostras serão fundidas em cadinhos de MgO na temperatura de 1600ºC e, após 90 minutos nesta temperatura, as mesmas serão resfriadas em água. Alguns parâmetros que poderão ser estudados são a população de inclusões, viscosidade efetiva da escória, teor de oxigênio total e composição de inclusões ao longo do tempo. Palavras-chave: Refino secundário; Limpeza de aços; Forno resistivo; Inclusões. REVIEW AND PLANNING OF EXPERIMENTS WITH STEEL AND SLAG IN LABORATORY FURNACE TO THE STUDY OF INCLUSIONS AbstractEvery year the demand for clean steels increases, making inclusion control each time more important. During the steel secondary refining, occurs the elimination of impurities, adjustment of the chemical composition and adjustment of the temperature of the liquid steel. The removal of non-metallic inclusions usually occurs in this step, being performed by the slag. In this work, a planning of experiments was defined so that in a second stage, the obtained knowledge can be compared and transferred to the industrial practice. Initially, a review of the literature on experiments carried out in laboratory furnaces with samples with steel and slag was carried out in studies focused on the removal of inclusions. After analyzing different proposed experimental arrangements, some selected works were analyzed with respect to the inclusions and the present slag. Finally, in the proposed planning, the experiments will be carried out in a resistive furnace with argon passage. The samples will be melted in MgO crucibles at 1600°C and, after 90 minutes at this temperature, they will be cooled in water. Some parameters that could be study are the population of inclusions, effective viscosity of the slag, total oxygen content and composition of inclusions over time. AutorTodoroki [22] Park [20] Jiang [23] Jiang [24] Jiang [16] Wang [19] Jiang [17] Jiang [25] He [18] Yu [15] Kumar [26] Wang [5]Stephano [27] Li [28] 3.1.

show abstract

Investigation on the Effects of Ladle Change Operation and Tundish Cover Powder on Steel Cleanliness in a Continuous Casting Tundish

Ling

Wang

et al. 2021

steel research int.

View full text Add to dashboard Cite

The multiphase flows involving steel—slag—air phases in a two‐strand tundish during ladle change are investigated using mathematical modeling. Experimental results from water modeling are used to validate the simulated results. Tundish cover powder (TCP) and steel samples are taken from eight heats in one sequence to evaluate the effect of the multiphase flows during ladle change on the composition of the TCPs and steel cleanliness. Furthermore, the effect of the refilling time on the air entrainment and slag aperture during ladle change is analyzed and discussed. It is found that the strong turbulent flows in the tundish impact zone during ladle change promote the mix of the two‐layer cover powder, which consists of a basic TCP layer at the bottom and a top layer of rice hull balls. It results in a significant change in the composition of the TCPs and gradually deteriorates the steel cleanliness by the slag—steel reaction. Increasing the refilling time can effectively decrease the amount of entrained air and area of slag layer aperture in the tundish bath during ladle change. To reduce the steel reoxidation during ladle change, the refilling time should be larger than 184 s. Moreover, a new TCP is developed instead of the top layer of rice hull balls in industrial production. The use of the new TCP significantly improves the steel cleanliness in the tundish.

show abstract

Steel Reoxidation by Gunning Mass and Tundish Slag

Cited by 20 publications

References 19 publications

Laboratorial Analysis of Inclusions Formed by Reoxidation in Tundish Steelmaking

Laboratorial Analysis of Inclusions Formed by Reoxidation in Tundish Steelmaking

Revisão E Planejamento De Experimentos Com Aço E Escória Em Forno De Laboratório Para O Estudo De Inclusões

Investigation on the Effects of Ladle Change Operation and Tundish Cover Powder on Steel Cleanliness in a Continuous Casting Tundish

Contact Info

Product

Resources

About