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You searched for +publisher:"UNIVERSIDADE FEDERAL DE OURO PRETO" +contributor:("Aparecido Tsutomu Nakamura"). One record found.

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UNIVERSIDADE FEDERAL DE OURO PRETO

1. Hadriel Gonçalves da Silva. Estudo sobre o pick-up de nitrogênio após a etapa de refino primário do aço.

Degree: 2010, UNIVERSIDADE FEDERAL DE OURO PRETO

With the growing need of high quality steel there is a great demand for the development and production of steels with ever stringent chemical composition restrictions. For instance the presence of carbon and nitrogen in Interstitial Free steels for automobile industry. These restrictions are defined by the final application to which the product is destined. In the case of steels for application in drawing which require a minimum deformability the nitrogen content becomes a critical point. This study seeks to analyze the factors that determine the variation of the nitrogen content until the moment the liquid steel is released to the secondary refining station. This was accomplished by analyzing a database from ArcelorMittal Tubarão Steelmaking Shop. The data has been analyzed under a more practical point of view and in consonance with mathematical models, in such a way to identify the degree of influence of some operational parameters. Some conclusions could be reached: 1) The results showed that with the presence of slag, the pick-up of nitrogen is negligible. The average nitrogen pick-up between the end of blow and release of steel to the secondary refining station, 1 N D , was close to 5.5 ppm; the average nitrogen pickup between releasing the steel to secondary refining and the first sample taken in the secondary refining station, 2 N D , was 3.5 ppm. API steel grades are a special case of comparatively high pickup( 1 N D was 13.9 ppm and 2 N D was 7.6 ppm). API grades require heavy addition of alloy material (up to 5,000 kg) and aluminum (around 650kg) and bubbling with inert gas up to 10 minutes. These alloy additions and gas bubbling in the ladle are performed after tapping steel from the converter before releasing it to secondary refining stations. 2) A statistical evaluation of variables affecting nitrogen pickup was performed for both 1 N D and 2 N D . The most influential independent variables have been found to be mass of nitrogen in the Aluminum addition and liquid steel weight for 1 N D , and time of ladle bubbling for 2 N D . The value of adjusted R2 was 0.21 in regard to 1 N D regression and 0.09 for 2 N D regression; 3)_ The estimate of possible nitrogen pick-up through the "eye of the plume, using AM Tubarão data do not suggest a very significant value exception made for API grades ; argon rinsing alone do not explain all nitrogen pickup 4)_ The average nitrogen pick-up as determined through this work can be deemed small as compared to nitrogen pickup from secondary refining to continuous casting, which is around 15 or 20 ppm. Regardless the low value it must be taken in consideration when evaluating the feasibility of producing a given steel grade; 5)_ It was found that nitrogen pick-up is connected to the aluminum addition. This may be due to the release of interfacial sites previously occupied by oxygen or sulfur.

Com a necessidade crescente de maior qualidade exigida pelo mercado consumidor de aço, há uma grande demanda para o desenvolvimento da produção de aços com restrições cada vez maiores…

Advisors/Committee Members: Itavahn Alves da Silva, Aparecido Tsutomu Nakamura, Varadarajan Seshadri, Carlos Antônio da Silva.

Subjects/Keywords: Aço - Refinação; Nitrogênio; Gás; ENGENHARIA DE MATERIAIS E METALURGICA

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APA (6th Edition):

Silva, H. G. d. (2010). Estudo sobre o pick-up de nitrogênio após a etapa de refino primário do aço. (Thesis). UNIVERSIDADE FEDERAL DE OURO PRETO. Retrieved from http://www.tede.ufop.br/tde_busca/arquivo.php?codArquivo=573

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Silva, Hadriel Gonçalves da. “Estudo sobre o pick-up de nitrogênio após a etapa de refino primário do aço.” 2010. Thesis, UNIVERSIDADE FEDERAL DE OURO PRETO. Accessed January 18, 2020. http://www.tede.ufop.br/tde_busca/arquivo.php?codArquivo=573.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Silva, Hadriel Gonçalves da. “Estudo sobre o pick-up de nitrogênio após a etapa de refino primário do aço.” 2010. Web. 18 Jan 2020.

Vancouver:

Silva HGd. Estudo sobre o pick-up de nitrogênio após a etapa de refino primário do aço. [Internet] [Thesis]. UNIVERSIDADE FEDERAL DE OURO PRETO; 2010. [cited 2020 Jan 18]. Available from: http://www.tede.ufop.br/tde_busca/arquivo.php?codArquivo=573.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Silva HGd. Estudo sobre o pick-up de nitrogênio após a etapa de refino primário do aço. [Thesis]. UNIVERSIDADE FEDERAL DE OURO PRETO; 2010. Available from: http://www.tede.ufop.br/tde_busca/arquivo.php?codArquivo=573

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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