EFFECT OF DEW POINT OF ATMOSPHERE OF CGL’S ANNEALING FURNACES ON THE QUALITY OF GA COATING ON BAKE HARDENABLE STEEL
The strip steel surface condition after continuous annealing of strip is extremely important to the quality of galvannealed coating (GA). The presence of oxides or precipitated can affect the reactions at the coating/substrate interface and decrease the zinc wettability on the steel surface, leadi...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia, Materiais e Mineração
2013-10-01
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| Series: | Tecnologia em Metalurgia, Materiais e Mineração |
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| Online Access: | http://www.tecnologiammm.com.br/files/v10n3/v10n3a11.pdf |
| _version_ | 1797711541778251776 |
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| author | Juliana Porto Guimarães Aldo Henrique de Almeida Barbosa Berenice Mendonça Gonzalez Deyselane de Fátima Anício José Januário Zacarias |
| author_facet | Juliana Porto Guimarães Aldo Henrique de Almeida Barbosa Berenice Mendonça Gonzalez Deyselane de Fátima Anício José Januário Zacarias |
| author_sort | Juliana Porto Guimarães |
| collection | DOAJ |
| description | The strip steel surface condition after continuous annealing of strip is extremely important to the quality of
galvannealed coating (GA). The presence of oxides or precipitated can affect the reactions at the coating/substrate
interface and decrease the zinc wettability on the steel surface, leading to various defects in the final product. To avoid
oxidation of the material during continuous annealing, a protective atmosphere is used in the furnaces. Despite this
atmosphere, it is possible the selective oxidation or precipitation of second phase particles, being the dew point of
atmosphere one of the leading factors to reduce this occurrence. This study aims to evaluate the effect of the dew point
on the quality of GA coatings applied to a bake hardenable steel. The continuous annealing under dew points of –60°C,
30°C and 0°C, as well as hot dip galvanizing, were performed in a Hot Dip Process Simulator. It is found that the dew
point has a decisive influence on the amount, distribution and type of oxides formed, and the condition of –30°C provided
the coating with less failures and better adhesion. |
| first_indexed | 2024-03-12T07:08:29Z |
| format | Article |
| id | doaj.art-cabb93705f8449d58f0ba7591f2e0dc7 |
| institution | Directory Open Access Journal |
| issn | 2176-1515 2176-1523 |
| language | English |
| last_indexed | 2024-03-12T07:08:29Z |
| publishDate | 2013-10-01 |
| publisher | Associação Brasileira de Metalurgia, Materiais e Mineração |
| record_format | Article |
| series | Tecnologia em Metalurgia, Materiais e Mineração |
| spelling | doaj.art-cabb93705f8449d58f0ba7591f2e0dc72023-09-02T23:16:39ZengAssociação Brasileira de Metalurgia, Materiais e MineraçãoTecnologia em Metalurgia, Materiais e Mineração2176-15152176-15232013-10-01103272279http://dx.doi.org/10.4322/tmm.2013.038EFFECT OF DEW POINT OF ATMOSPHERE OF CGL’S ANNEALING FURNACES ON THE QUALITY OF GA COATING ON BAKE HARDENABLE STEELJuliana Porto Guimarães0Aldo Henrique de Almeida Barbosa1Berenice Mendonça Gonzalez 2Deyselane de Fátima Anício3José Januário Zacarias4Engenheira Química, MSc. Pesquisador Sênior. Usiminas, Engenheiro Metalurgista, Dr. Pesquisador Especialista Pleno. UsiminasFísica, Dr. Professor Associado. Universidade Federal de Minas Gerais, Escola de Engenharia, Departamento de Engenharia Metalúrgica e de MateriaisTécnica Metalurgista. Técnico Pesquisa I. UsiminasTécnico Químico. Técnico Pesquisa III. UsiminasThe strip steel surface condition after continuous annealing of strip is extremely important to the quality of galvannealed coating (GA). The presence of oxides or precipitated can affect the reactions at the coating/substrate interface and decrease the zinc wettability on the steel surface, leading to various defects in the final product. To avoid oxidation of the material during continuous annealing, a protective atmosphere is used in the furnaces. Despite this atmosphere, it is possible the selective oxidation or precipitation of second phase particles, being the dew point of atmosphere one of the leading factors to reduce this occurrence. This study aims to evaluate the effect of the dew point on the quality of GA coatings applied to a bake hardenable steel. The continuous annealing under dew points of –60°C, 30°C and 0°C, as well as hot dip galvanizing, were performed in a Hot Dip Process Simulator. It is found that the dew point has a decisive influence on the amount, distribution and type of oxides formed, and the condition of –30°C provided the coating with less failures and better adhesion.http://www.tecnologiammm.com.br/files/v10n3/v10n3a11.pdfContinuous annealing; Dew point; Bake hardenable steel; Galvannealed coating. |
| spellingShingle | Juliana Porto Guimarães Aldo Henrique de Almeida Barbosa Berenice Mendonça Gonzalez Deyselane de Fátima Anício José Januário Zacarias EFFECT OF DEW POINT OF ATMOSPHERE OF CGL’S ANNEALING FURNACES ON THE QUALITY OF GA COATING ON BAKE HARDENABLE STEEL Tecnologia em Metalurgia, Materiais e Mineração Continuous annealing; Dew point; Bake hardenable steel; Galvannealed coating. |
| title | EFFECT OF DEW POINT OF ATMOSPHERE OF CGL’S ANNEALING FURNACES ON THE QUALITY OF GA COATING ON BAKE HARDENABLE STEEL |
| title_full | EFFECT OF DEW POINT OF ATMOSPHERE OF CGL’S ANNEALING FURNACES ON THE QUALITY OF GA COATING ON BAKE HARDENABLE STEEL |
| title_fullStr | EFFECT OF DEW POINT OF ATMOSPHERE OF CGL’S ANNEALING FURNACES ON THE QUALITY OF GA COATING ON BAKE HARDENABLE STEEL |
| title_full_unstemmed | EFFECT OF DEW POINT OF ATMOSPHERE OF CGL’S ANNEALING FURNACES ON THE QUALITY OF GA COATING ON BAKE HARDENABLE STEEL |
| title_short | EFFECT OF DEW POINT OF ATMOSPHERE OF CGL’S ANNEALING FURNACES ON THE QUALITY OF GA COATING ON BAKE HARDENABLE STEEL |
| title_sort | effect of dew point of atmosphere of cgl s annealing furnaces on the quality of ga coating on bake hardenable steel |
| topic | Continuous annealing; Dew point; Bake hardenable steel; Galvannealed coating. |
| url | http://www.tecnologiammm.com.br/files/v10n3/v10n3a11.pdf |
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