Effect of Slag Basicity on Non-Metallic Inclusions and Cleanliness of 15-5PH Stainless Steel
Few reports exist on the effect of the basicity of refining slag on inclusions in 15-5PH stainless steel and its removal efficiency. In this study, the effects of various basicities on the formation and removal efficiency of inclusions in molten steel were investigated. To investigate the effect of...
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MDPI AG
2023-04-01
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| author | Zhonghua Zhan Yanling Zhang Ruxing Shi Tong Qiao Guanbo Wang Guoguang Cheng |
| author_facet | Zhonghua Zhan Yanling Zhang Ruxing Shi Tong Qiao Guanbo Wang Guoguang Cheng |
| author_sort | Zhonghua Zhan |
| collection | DOAJ |
| description | Few reports exist on the effect of the basicity of refining slag on inclusions in 15-5PH stainless steel and its removal efficiency. In this study, the effects of various basicities on the formation and removal efficiency of inclusions in molten steel were investigated. To investigate the effect of the chemical makeup of slag on the non-metallic inclusions in liquid steel, laboratory experiments and thermodynamic calculations were conducted on CaO-MgO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-CaF<sub>2</sub> slag with various slag basicities and 15-5PH stainless steel. In the steel samples that had reacted with high-basicity slag samples, the magnesium content and aluminum yield were higher. Thermodynamic findings according to the ion and molecule coexistence theory showed that log (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mi>a</mi><mrow><msub><mrow><mi>SiO</mi></mrow><mn>2</mn></msub></mrow><mn>3</mn></msubsup><mo>/</mo><msubsup><mi>a</mi><mrow><msub><mrow><mi>Al</mi></mrow><mn>2</mn></msub><msub><mi mathvariant="normal">O</mi><mn>3</mn></msub></mrow><mn>2</mn></msubsup></mrow></semantics></math></inline-formula>) decreases as slag basicity increases. This increases the Al concentration in liquid steel while decreasing the Si content. Log (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mi>a</mi><mrow><mi>MgO</mi></mrow><mn>3</mn></msubsup><mo>/</mo><msub><mi>a</mi><mrow><msub><mrow><mi>Al</mi></mrow><mn>2</mn></msub><msub><mi mathvariant="normal">O</mi><mn>3</mn></msub></mrow></msub></mrow></semantics></math></inline-formula>) also increases, increasing the Mg content of the molten steel. With this, the transformation order of oxide inclusions is Al<sub>2</sub>O<sub>3</sub> → MgAl<sub>2</sub>O<sub>4</sub> → MgO. High-basicity slag increases the attachment of slag to inclusions and generates MgAl<sub>2</sub>O<sub>4</sub> inclusions that are more easily adsorbed by inclusions in molten steel, thereby improving the cleanliness of molten steel. |
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| spelling | doaj.art-519ee716e2ad424481937eb3bd397b142023-11-17T20:27:11ZengMDPI AGMetals2075-47012023-04-0113475010.3390/met13040750Effect of Slag Basicity on Non-Metallic Inclusions and Cleanliness of 15-5PH Stainless SteelZhonghua Zhan0Yanling Zhang1Ruxing Shi2Tong Qiao3Guanbo Wang4Guoguang Cheng5State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaCITIC Heavy Machinery Co., Ltd., Luoyang 471039, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, ChinaFew reports exist on the effect of the basicity of refining slag on inclusions in 15-5PH stainless steel and its removal efficiency. In this study, the effects of various basicities on the formation and removal efficiency of inclusions in molten steel were investigated. To investigate the effect of the chemical makeup of slag on the non-metallic inclusions in liquid steel, laboratory experiments and thermodynamic calculations were conducted on CaO-MgO-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-CaF<sub>2</sub> slag with various slag basicities and 15-5PH stainless steel. In the steel samples that had reacted with high-basicity slag samples, the magnesium content and aluminum yield were higher. Thermodynamic findings according to the ion and molecule coexistence theory showed that log (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mi>a</mi><mrow><msub><mrow><mi>SiO</mi></mrow><mn>2</mn></msub></mrow><mn>3</mn></msubsup><mo>/</mo><msubsup><mi>a</mi><mrow><msub><mrow><mi>Al</mi></mrow><mn>2</mn></msub><msub><mi mathvariant="normal">O</mi><mn>3</mn></msub></mrow><mn>2</mn></msubsup></mrow></semantics></math></inline-formula>) decreases as slag basicity increases. This increases the Al concentration in liquid steel while decreasing the Si content. Log (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mi>a</mi><mrow><mi>MgO</mi></mrow><mn>3</mn></msubsup><mo>/</mo><msub><mi>a</mi><mrow><msub><mrow><mi>Al</mi></mrow><mn>2</mn></msub><msub><mi mathvariant="normal">O</mi><mn>3</mn></msub></mrow></msub></mrow></semantics></math></inline-formula>) also increases, increasing the Mg content of the molten steel. With this, the transformation order of oxide inclusions is Al<sub>2</sub>O<sub>3</sub> → MgAl<sub>2</sub>O<sub>4</sub> → MgO. High-basicity slag increases the attachment of slag to inclusions and generates MgAl<sub>2</sub>O<sub>4</sub> inclusions that are more easily adsorbed by inclusions in molten steel, thereby improving the cleanliness of molten steel.https://www.mdpi.com/2075-4701/13/4/750slag basicity15-5PH stainless steelnon-metallic inclusionscleanlinesswork of adhesion |
| spellingShingle | Zhonghua Zhan Yanling Zhang Ruxing Shi Tong Qiao Guanbo Wang Guoguang Cheng Effect of Slag Basicity on Non-Metallic Inclusions and Cleanliness of 15-5PH Stainless Steel Metals slag basicity 15-5PH stainless steel non-metallic inclusions cleanliness work of adhesion |
| title | Effect of Slag Basicity on Non-Metallic Inclusions and Cleanliness of 15-5PH Stainless Steel |
| title_full | Effect of Slag Basicity on Non-Metallic Inclusions and Cleanliness of 15-5PH Stainless Steel |
| title_fullStr | Effect of Slag Basicity on Non-Metallic Inclusions and Cleanliness of 15-5PH Stainless Steel |
| title_full_unstemmed | Effect of Slag Basicity on Non-Metallic Inclusions and Cleanliness of 15-5PH Stainless Steel |
| title_short | Effect of Slag Basicity on Non-Metallic Inclusions and Cleanliness of 15-5PH Stainless Steel |
| title_sort | effect of slag basicity on non metallic inclusions and cleanliness of 15 5ph stainless steel |
| topic | slag basicity 15-5PH stainless steel non-metallic inclusions cleanliness work of adhesion |
| url | https://www.mdpi.com/2075-4701/13/4/750 |
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