Influence of refining slag composition on nonmetallic inclusions in 38CrMoAl steel
To achieve economic transfer of calcium and accurate inclusion modification by utilizing the high basicity of slag instead of calcium treatment, the refining slag of 38CrMoAl steel was optimized through thermodynamic calculations in view of the large size and high melting point of nonmetallic inclus...
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Elsevier
2025-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424028631 |
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| author | Guofang Xu Shiheng Liang Bo Song Wei Liu Shufeng Yang Li Zhao Yabing Zhang |
| author_facet | Guofang Xu Shiheng Liang Bo Song Wei Liu Shufeng Yang Li Zhao Yabing Zhang |
| author_sort | Guofang Xu |
| collection | DOAJ |
| description | To achieve economic transfer of calcium and accurate inclusion modification by utilizing the high basicity of slag instead of calcium treatment, the refining slag of 38CrMoAl steel was optimized through thermodynamic calculations in view of the large size and high melting point of nonmetallic inclusions that occur during the production of the steel grade in the refining process of a domestic plant. The inclusions lead to severe nozzle clogging and affect the quality of the molten steel. An industrial experiment was subsequently conducted to verify the results. The optimized refining slag (57.5% CaO, 23% Al2O3, 3% MgO and 5% SiO2) was beneficial for inclusion removal at 1600 °C, and the actual refining slag (58.5% CaO, 27.5% Al2O3, 3% MgO and 1.41% SiO2) was very close to the optimized slag. The morphology and composition of nonmetallic inclusions in different processes were analysed via SEM, and the number and size of nonmetallic inclusions in different processes of LF were also analysed. The results indicate that the size of nonmetallic inclusions after the refining slag is optimized is smaller than before, especially after aluminium is fed into the LF. The type of nonmetallic inclusions changed, and the diameter and number density of the nonmetallic inclusions decreased. The highest proportion of inclusions in the nozzle clog also changed. The number of heats for the continuous pouring of the tundish increased from 6 to 12. |
| format | Article |
| id | doaj-art-051508f8184e44e7abfad1957ecd1303 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-051508f8184e44e7abfad1957ecd13032025-01-19T06:25:14ZengElsevierJournal of Materials Research and Technology2238-78542025-01-0134209219Influence of refining slag composition on nonmetallic inclusions in 38CrMoAl steelGuofang Xu0Shiheng Liang1Bo Song2Wei Liu3Shufeng Yang4Li Zhao5Yabing Zhang6School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, PR ChinaSchool of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, PR ChinaSchool of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, PR China; Corresponding author.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, PR China; Corresponding author.School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, PR ChinaWuhu Xinxing Ductile Pipe Co., Ltd., Wuhu, 241002, Anhui, PR ChinaWuhu Xinxing Ductile Pipe Co., Ltd., Wuhu, 241002, Anhui, PR ChinaTo achieve economic transfer of calcium and accurate inclusion modification by utilizing the high basicity of slag instead of calcium treatment, the refining slag of 38CrMoAl steel was optimized through thermodynamic calculations in view of the large size and high melting point of nonmetallic inclusions that occur during the production of the steel grade in the refining process of a domestic plant. The inclusions lead to severe nozzle clogging and affect the quality of the molten steel. An industrial experiment was subsequently conducted to verify the results. The optimized refining slag (57.5% CaO, 23% Al2O3, 3% MgO and 5% SiO2) was beneficial for inclusion removal at 1600 °C, and the actual refining slag (58.5% CaO, 27.5% Al2O3, 3% MgO and 1.41% SiO2) was very close to the optimized slag. The morphology and composition of nonmetallic inclusions in different processes were analysed via SEM, and the number and size of nonmetallic inclusions in different processes of LF were also analysed. The results indicate that the size of nonmetallic inclusions after the refining slag is optimized is smaller than before, especially after aluminium is fed into the LF. The type of nonmetallic inclusions changed, and the diameter and number density of the nonmetallic inclusions decreased. The highest proportion of inclusions in the nozzle clog also changed. The number of heats for the continuous pouring of the tundish increased from 6 to 12.http://www.sciencedirect.com/science/article/pii/S223878542402863138CrMoAl steelNonmetallic inclusionsRefining slagNozzle clogging |
| spellingShingle | Guofang Xu Shiheng Liang Bo Song Wei Liu Shufeng Yang Li Zhao Yabing Zhang Influence of refining slag composition on nonmetallic inclusions in 38CrMoAl steel Journal of Materials Research and Technology 38CrMoAl steel Nonmetallic inclusions Refining slag Nozzle clogging |
| title | Influence of refining slag composition on nonmetallic inclusions in 38CrMoAl steel |
| title_full | Influence of refining slag composition on nonmetallic inclusions in 38CrMoAl steel |
| title_fullStr | Influence of refining slag composition on nonmetallic inclusions in 38CrMoAl steel |
| title_full_unstemmed | Influence of refining slag composition on nonmetallic inclusions in 38CrMoAl steel |
| title_short | Influence of refining slag composition on nonmetallic inclusions in 38CrMoAl steel |
| title_sort | influence of refining slag composition on nonmetallic inclusions in 38crmoal steel |
| topic | 38CrMoAl steel Nonmetallic inclusions Refining slag Nozzle clogging |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424028631 |
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