Caracterização de inclusões não metálicas em um aço ultra baixo carbono estabilizado ao Ti e desoxidado ao Al

• Autor(a) principal: Leão, Pablo Bruno Paiva
• Data de Publicação: 2017
• Outros Autores: Rodrigues Filho, Raimundo Nonato, Ferreira, Hilder Caldas, Carneiro, Carlos André Ruy, Silva, Soraia Karolinne Castro, Bielefeldt, Wagner Viana, Klug, Jeferson Leandro
• Tipo de documento: Artigo de conferência
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/58047
• topic: Nonmetallic inclusions; Cloggingof submersed valves; Manual analysis of inclusions

The present work is based on the characterization of nonmetallic inclusions in Tistabilized ultra-low carbon steel, produced in a large steel mill. Due to a large incidence of submersed valve cloggingin a continuous casting, the study is important in order to know the characteristics of the inclusions which are causing the problem. Total of24heats were sampledin the tundishand manually analyzed with a scanning electron microscope.The results revealed that 98.65% of the 3183 inclusions analyzed were solid in steelmakingtemperature and 66.54% were alumina. The solid inclusions ofalumina have low wettability for the iron bath, showinga high tendency of agglomeration in the submersed valves, affecting the castability. It has been concluded from the results and literature that some alternative measures such as the application of the treatment with calcium, precautions to avoid steel re-oxidation and the total or partial replacement of the pre-deoxidized element; would reduce the obstruction problem.