Analysis of secondary refining slag parameters with focus on inclusion cleanliness

Detalhes bibliográficos
Autor(a) principal: Pereira, Julio Anibal Morales
Data de Publicação: 2018
Outros Autores: Rocha, Vinicius Cardoso da, Yoshioka, Ayumi, Bielefeldt, Wagner Viana, Vilela, Antonio Cezar Faria
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/185203
Resumo: Secondary refining slag samples with different chemical compositions (45-54 % CaO, 7-13 % Al2O3, 20-29 % SiO2, 9-16 % MgO, 0-5 % CaF2) were investigated to verify the influence of their effective viscosity on inclusion cleanliness of DIN 38MnS6 in a steelmaking plant. The steel samples were collected during the production process for analysis of inclusions. Using the commercial software FactSage 6.4, thermodynamic calculations were performed to determine the effective viscosity, solid fraction, liquid fraction and MgO saturation point of these slags at 1560ºC. The results showed that all the slags were saturated in MgO, revealing a better protection of the ladle refractory. The addition of 2 to 5 % of CaF2 reduced the effective viscosity values for the analyzed slags from 0.45 Pa∙s to 0.10 Pa∙s , in comparison to the slags without the addition of CaF2, with an effective viscosity of 0.40 Pa∙s, 0.27 Pa∙s and 0.22 Pa∙s, decreasing the level of non-metallic inclusions for some of the analysed heats. However, it was detected during the manufacturing process that high slag fluidity and re-oxidation events continue to be a challenge associated with reducing the level of non-metallic inclusions.
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spelling Pereira, Julio Anibal MoralesRocha, Vinicius Cardoso daYoshioka, AyumiBielefeldt, Wagner VianaVilela, Antonio Cezar Faria2018-11-28T02:45:54Z20181516-1439http://hdl.handle.net/10183/185203001081555Secondary refining slag samples with different chemical compositions (45-54 % CaO, 7-13 % Al2O3, 20-29 % SiO2, 9-16 % MgO, 0-5 % CaF2) were investigated to verify the influence of their effective viscosity on inclusion cleanliness of DIN 38MnS6 in a steelmaking plant. The steel samples were collected during the production process for analysis of inclusions. Using the commercial software FactSage 6.4, thermodynamic calculations were performed to determine the effective viscosity, solid fraction, liquid fraction and MgO saturation point of these slags at 1560ºC. The results showed that all the slags were saturated in MgO, revealing a better protection of the ladle refractory. The addition of 2 to 5 % of CaF2 reduced the effective viscosity values for the analyzed slags from 0.45 Pa∙s to 0.10 Pa∙s , in comparison to the slags without the addition of CaF2, with an effective viscosity of 0.40 Pa∙s, 0.27 Pa∙s and 0.22 Pa∙s, decreasing the level of non-metallic inclusions for some of the analysed heats. However, it was detected during the manufacturing process that high slag fluidity and re-oxidation events continue to be a challenge associated with reducing the level of non-metallic inclusions.application/pdfengMaterials research : ibero-american journal of materials. São Carlos, SP. Vol. 21, no. 5 (2018), e20180296, p. 1-11EscóriaViscosidadeAçoInclusão não metálicaRefining slagsViscosityInclusionsClean steelsSecondary metallurgyAnalysis of secondary refining slag parameters with focus on inclusion cleanlinessinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001081555.pdf.txt001081555.pdf.txtExtracted Texttext/plain49187http://www.lume.ufrgs.br/bitstream/10183/185203/2/001081555.pdf.txtabf92aaa1f744adf7a48e6d404593f48MD52ORIGINAL001081555.pdfTexto completo (inglês)application/pdf1459002http://www.lume.ufrgs.br/bitstream/10183/185203/1/001081555.pdfa0ce15e116acab4bcf2342fa3aeec641MD5110183/1852032024-10-17 06:55:22.347557oai:www.lume.ufrgs.br:10183/185203Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2024-10-17T09:55:22Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Analysis of secondary refining slag parameters with focus on inclusion cleanliness
title Analysis of secondary refining slag parameters with focus on inclusion cleanliness
spellingShingle Analysis of secondary refining slag parameters with focus on inclusion cleanliness
Pereira, Julio Anibal Morales
Escória
Viscosidade
Aço
Inclusão não metálica
Refining slags
Viscosity
Inclusions
Clean steels
Secondary metallurgy
title_short Analysis of secondary refining slag parameters with focus on inclusion cleanliness
title_full Analysis of secondary refining slag parameters with focus on inclusion cleanliness
title_fullStr Analysis of secondary refining slag parameters with focus on inclusion cleanliness
title_full_unstemmed Analysis of secondary refining slag parameters with focus on inclusion cleanliness
title_sort Analysis of secondary refining slag parameters with focus on inclusion cleanliness
author Pereira, Julio Anibal Morales
author_facet Pereira, Julio Anibal Morales
Rocha, Vinicius Cardoso da
Yoshioka, Ayumi
Bielefeldt, Wagner Viana
Vilela, Antonio Cezar Faria
author_role author
author2 Rocha, Vinicius Cardoso da
Yoshioka, Ayumi
Bielefeldt, Wagner Viana
Vilela, Antonio Cezar Faria
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Pereira, Julio Anibal Morales
Rocha, Vinicius Cardoso da
Yoshioka, Ayumi
Bielefeldt, Wagner Viana
Vilela, Antonio Cezar Faria
dc.subject.por.fl_str_mv Escória
Viscosidade
Aço
Inclusão não metálica
topic Escória
Viscosidade
Aço
Inclusão não metálica
Refining slags
Viscosity
Inclusions
Clean steels
Secondary metallurgy
dc.subject.eng.fl_str_mv Refining slags
Viscosity
Inclusions
Clean steels
Secondary metallurgy
description Secondary refining slag samples with different chemical compositions (45-54 % CaO, 7-13 % Al2O3, 20-29 % SiO2, 9-16 % MgO, 0-5 % CaF2) were investigated to verify the influence of their effective viscosity on inclusion cleanliness of DIN 38MnS6 in a steelmaking plant. The steel samples were collected during the production process for analysis of inclusions. Using the commercial software FactSage 6.4, thermodynamic calculations were performed to determine the effective viscosity, solid fraction, liquid fraction and MgO saturation point of these slags at 1560ºC. The results showed that all the slags were saturated in MgO, revealing a better protection of the ladle refractory. The addition of 2 to 5 % of CaF2 reduced the effective viscosity values for the analyzed slags from 0.45 Pa∙s to 0.10 Pa∙s , in comparison to the slags without the addition of CaF2, with an effective viscosity of 0.40 Pa∙s, 0.27 Pa∙s and 0.22 Pa∙s, decreasing the level of non-metallic inclusions for some of the analysed heats. However, it was detected during the manufacturing process that high slag fluidity and re-oxidation events continue to be a challenge associated with reducing the level of non-metallic inclusions.
publishDate 2018
dc.date.accessioned.fl_str_mv 2018-11-28T02:45:54Z
dc.date.issued.fl_str_mv 2018
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/185203
dc.identifier.issn.pt_BR.fl_str_mv 1516-1439
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dc.relation.ispartof.pt_BR.fl_str_mv Materials research : ibero-american journal of materials. São Carlos, SP. Vol. 21, no. 5 (2018), e20180296, p. 1-11
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