Source and Transformation of MgO-Based Inclusions in Si-Mn-Killed Steel with Lime-Silicate Slag
The origin, evolution, and formation mechanism of MgO-based inclusions in Si-Mn-killed steel were studied in industrial trials with systematical samplings of the refining ladle, casting tundish, and as-cast bloom. In the present study, there were large numbers of MgO-based non-metallic inclusions, w...
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MDPI AG
2022-08-01
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| Online Access: | https://www.mdpi.com/2075-4701/12/8/1323 |
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| author | Jiaqi Zhao Jianhua Chu Xin Liu Min Wang Xiaofeng Cai Han Ma Yanping Bao |
| author_facet | Jiaqi Zhao Jianhua Chu Xin Liu Min Wang Xiaofeng Cai Han Ma Yanping Bao |
| author_sort | Jiaqi Zhao |
| collection | DOAJ |
| description | The origin, evolution, and formation mechanism of MgO-based inclusions in Si-Mn-killed steel were studied in industrial trials with systematical samplings of the refining ladle, casting tundish, and as-cast bloom. In the present study, there were large numbers of MgO-based non-metallic inclusions, which started to form in the LF final process, and the MgO content in the lime-silicate slag increases from LF to VD process. The reason for the formation of MgO-based inclusions in refining process was analyzed using FactSage8.1 software. It was found that MgO-based inclusions were caused by the violent reaction between the slag and steel and the serious erosion of MgO-C refractory. The MgO solubility decreased in the lime-silicate slag and precipitated the periclase phase with basicity increasing. The solubility of MgO increased with an increase in the temperature. Measures were taken to optimize the refining process based on the above result. By increasing the slag basicity and increasing the content of MgO in the slag, erosion of the MgO-C refractory was reduced and the number of MgO-based non-metallic inclusions decreased from 0.2 to 0.04 per square millimeter. |
| first_indexed | 2024-03-09T09:52:50Z |
| format | Article |
| id | doaj.art-5f1b53f697da49ee94df1e009d9724ba |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T09:52:50Z |
| publishDate | 2022-08-01 |
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| record_format | Article |
| series | Metals |
| spelling | doaj.art-5f1b53f697da49ee94df1e009d9724ba2023-12-01T23:59:40ZengMDPI AGMetals2075-47012022-08-01128132310.3390/met12081323Source and Transformation of MgO-Based Inclusions in Si-Mn-Killed Steel with Lime-Silicate SlagJiaqi Zhao0Jianhua Chu1Xin Liu2Min Wang3Xiaofeng Cai4Han Ma5Yanping Bao6State Key Lab of Advanced Metallurgy, University of Science & Technology Beijing, Beijing 100083, ChinaSchool of Metallurgical Engineering, Anhui University of Technology, Maanshan 243002, ChinaState Key Lab of Advanced Metallurgy, University of Science & Technology Beijing, Beijing 100083, ChinaState Key Lab of Advanced Metallurgy, University of Science & Technology Beijing, Beijing 100083, ChinaInstitute of Research of Iron & Steel, Zhangjiagang 215600, ChinaInstitute of Research of Iron & Steel, Zhangjiagang 215600, ChinaState Key Lab of Advanced Metallurgy, University of Science & Technology Beijing, Beijing 100083, ChinaThe origin, evolution, and formation mechanism of MgO-based inclusions in Si-Mn-killed steel were studied in industrial trials with systematical samplings of the refining ladle, casting tundish, and as-cast bloom. In the present study, there were large numbers of MgO-based non-metallic inclusions, which started to form in the LF final process, and the MgO content in the lime-silicate slag increases from LF to VD process. The reason for the formation of MgO-based inclusions in refining process was analyzed using FactSage8.1 software. It was found that MgO-based inclusions were caused by the violent reaction between the slag and steel and the serious erosion of MgO-C refractory. The MgO solubility decreased in the lime-silicate slag and precipitated the periclase phase with basicity increasing. The solubility of MgO increased with an increase in the temperature. Measures were taken to optimize the refining process based on the above result. By increasing the slag basicity and increasing the content of MgO in the slag, erosion of the MgO-C refractory was reduced and the number of MgO-based non-metallic inclusions decreased from 0.2 to 0.04 per square millimeter.https://www.mdpi.com/2075-4701/12/8/1323MgO saturationindustrial trialnon-metallic inclusionsthermodynamic calculation |
| spellingShingle | Jiaqi Zhao Jianhua Chu Xin Liu Min Wang Xiaofeng Cai Han Ma Yanping Bao Source and Transformation of MgO-Based Inclusions in Si-Mn-Killed Steel with Lime-Silicate Slag Metals MgO saturation industrial trial non-metallic inclusions thermodynamic calculation |
| title | Source and Transformation of MgO-Based Inclusions in Si-Mn-Killed Steel with Lime-Silicate Slag |
| title_full | Source and Transformation of MgO-Based Inclusions in Si-Mn-Killed Steel with Lime-Silicate Slag |
| title_fullStr | Source and Transformation of MgO-Based Inclusions in Si-Mn-Killed Steel with Lime-Silicate Slag |
| title_full_unstemmed | Source and Transformation of MgO-Based Inclusions in Si-Mn-Killed Steel with Lime-Silicate Slag |
| title_short | Source and Transformation of MgO-Based Inclusions in Si-Mn-Killed Steel with Lime-Silicate Slag |
| title_sort | source and transformation of mgo based inclusions in si mn killed steel with lime silicate slag |
| topic | MgO saturation industrial trial non-metallic inclusions thermodynamic calculation |
| url | https://www.mdpi.com/2075-4701/12/8/1323 |
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