Estudo Termodinâmico De Inclusões Não-Metálicas Em Aço Acalmado Ao Alumínio E Tratado Com Cálcio

Bielefeldt, Wagner Viana; Vilela, Antônio Cézar Faria

doi:10.4322/tmm.2011.017

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…This data is important because the slags in question show saturation in solids and have therefore not merged completely, unlike those reported in the available literature. [3][4][5]7,9,12,13,15,17) Table 7 show the results obtained by the SVP with FactSage 6.2. The same results are presented in graph form in Fig.…”

Section: -mentioning

confidence: 99%

Efficiency of Inclusion Absorption by Slags during Secondary Refining of Steel

2014

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One of the functions of secondary refining in steelmaking is to remove non-metallic inclusions produced through deoxidation of the steel bath during the process. Removal of these inclusions occurs in three fundamental stages: flotation, separation and dissolution of the inclusions in supernatant slag. Given that dissolution is subject to the action of slag, this study aims to clarify the inclusion absorption capacity of industrial slags and factors that influence slag properties in absorbing inclusions, as well as the impact of each factor on the cleanliness of the steels analyzed. To that end, the results of industrial steel and slag samples collected during the different stages of secondary refining were analyzed. The amount and chemical composition of the inclusions was determined by SEM/EDS (scanning electron microscopy coupled with energy-dispersive spectroscopy). The chemical composition of slag samples was measured by XRF (X-ray fluorescence) and subsequently submitted to thermodynamic simulations using FactSage 6.4 software. Calculations were made with the SlagViscosityPredictor, which uses FactSage 6.2 software. This made it possible to establish the chemical composition and proportion of the solid phase in the slags and inclusions, as well as the effective viscosity of the slags. The efficiency of absorption inclusion by the industrial slags was found to be greater in the presence of high thermodynamic driving force between slags and inclusions, low slag effective viscosity and when inclusions were not liquid.

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confidence: 99%

Efficiency of Inclusion Absorption by Slags during Secondary Refining of Steel

2014

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Cálculo De Adição Dinâmica De Cálcio Silício Para Aço Microligado Ao Cromo E Molibdênio

Mercier¹,

Neto²,

Tavares³

et al. 2014

ABM Proceedings

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Resumo A presença de inclusões nos aços está diretamente associada à sua limpidez, sendo que os diferentes tipos de inclusões não-metálicas podem prejudicar desde o processo de fabricação e conformação até as propriedades finais do aço exigidas para a sua aplicação. As inclusões se formam e se modificam ao longo do processo produtivo, e estão relacionadas principalmente às técnicas de refino secundário e lingotamento contínuo. Neste trabalho será desenvolvido um método de cálculo para a adição de CaSi em função do seu rendimento, nível de oxidação, composição química e temperatura do banho, objetivando atingir a "janela líquida" do aço. Espera-se que o cálculo da quantidade de CaSi a ser adicionada (atualmente utilizase uma taxa fixa) nos aços durante o processo de rinsagem, conduza, com mais segurança, a obtenção de inclusões líquidas e consequentemente uma melhor limpidez do produto. Palavras-chave: Inclusões não-metálicas; Oxigênio total; Adição de cálcio. DYNAMIC CALCULATION OF CaSi ADDITION FOR Cr AND Mo MICROALLOYED STEEL Abstract The presence of inclusions in the steel is directly associated to its cleanliness. Different types of non-metallic inclusions can harm the manufacturing and forming processes as well as the final steel properties demanded for its application. Inclusions are formed and modified throughout the steel manufacturing process, and their characteristics are mainly related to the techniques of secondary refining and continuous casting employed. In the present work, the relationship between the steel deoxidation (total oxygen content) and the amount of calcium added will be studied and evaluated aiming at appropriate castability and improved steel cleanliness. With this focus, a methodology to evaluate the CaSi additions depending on the calcium yield, oxidation level, chemical composition and temperature of the molten steel, aiming to target the "liquid window". It is expected that this technique of CaSi addition (currently uses a fixed rate) to the steel, during the argon bubbling process, will result in liquid inclusions and consequently a better cleanliness on the product.

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Estudo Termodinâmico De Inclusões Não-Metálicas Em Aço Acalmado Ao Alumínio E Tratado Com Cálcio

Cited by 2 publications

References 5 publications

Efficiency of Inclusion Absorption by Slags during Secondary Refining of Steel

Efficiency of Inclusion Absorption by Slags during Secondary Refining of Steel

Cálculo De Adição Dinâmica De Cálcio Silício Para Aço Microligado Ao Cromo E Molibdênio

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