{"title":"钢包渣中添加 TiO2 对含钛铝烧结钢中非金属夹杂物演变的影响","authors":"Guangyu Hao, Zhiyin Deng, Xiaofeng Liu, Miaoyong Zhu","doi":"10.1007/s11663-024-03181-4","DOIUrl":null,"url":null,"abstract":"<p>To investigate the effect of TiO<sub>2</sub> in refining slag on the nonmetallic inclusions in Ti-bearing Al-killed steel, industrial studies are conducted with and without TiO<sub>2</sub> addition in refining slags. It is found that a suitable addition of TiO<sub>2</sub> (around 5 pct) can improve the fluidity of the slag. When using TiO<sub>2</sub>-containing slag, the Ti content in steel increases to 72 ppm after LF refining due to [Ti]-[O] equilibrium, and the yield of Ti-Fe alloy also climbs from 86.5 to 96.3 pct in RH refining even with a lower addition amount. The inclusions generally transform from Al<sub>2</sub>O<sub>3</sub> into solid MgO-Al<sub>2</sub>O<sub>3</sub> and even liquid CaO-Al<sub>2</sub>O<sub>3</sub> inclusions. Although a small amount of TiO<sub><i>x</i></sub> is generated in inclusions at the middle stage of LF refining due to the effect of TiO<sub>2</sub>-containing slag, solid MgO-Al<sub>2</sub>O<sub>3</sub> inclusions are still the dominant inclusions in steel after RH refining. Therefore, the suitable addition of TiO<sub>2</sub> does not evidently influence the evolution of inclusions. As a result, it can hardly weaken the removal efficiency of inclusions, while the cleanliness of steel is in fact improved. Lower total oxygen and nitrogen contents are obtained, and the number density of inclusions decreases from 31.7 mm<sup>−2</sup> to 25.0 mm<sup>−2</sup>.</p>","PeriodicalId":18613,"journal":{"name":"Metallurgical and Materials Transactions B","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of TiO2 Addition in Ladle Slag on Evolution of Nonmetallic Inclusions in Ti-Bearing Al-Killed Steel\",\"authors\":\"Guangyu Hao, Zhiyin Deng, Xiaofeng Liu, Miaoyong Zhu\",\"doi\":\"10.1007/s11663-024-03181-4\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>To investigate the effect of TiO<sub>2</sub> in refining slag on the nonmetallic inclusions in Ti-bearing Al-killed steel, industrial studies are conducted with and without TiO<sub>2</sub> addition in refining slags. It is found that a suitable addition of TiO<sub>2</sub> (around 5 pct) can improve the fluidity of the slag. When using TiO<sub>2</sub>-containing slag, the Ti content in steel increases to 72 ppm after LF refining due to [Ti]-[O] equilibrium, and the yield of Ti-Fe alloy also climbs from 86.5 to 96.3 pct in RH refining even with a lower addition amount. The inclusions generally transform from Al<sub>2</sub>O<sub>3</sub> into solid MgO-Al<sub>2</sub>O<sub>3</sub> and even liquid CaO-Al<sub>2</sub>O<sub>3</sub> inclusions. Although a small amount of TiO<sub><i>x</i></sub> is generated in inclusions at the middle stage of LF refining due to the effect of TiO<sub>2</sub>-containing slag, solid MgO-Al<sub>2</sub>O<sub>3</sub> inclusions are still the dominant inclusions in steel after RH refining. Therefore, the suitable addition of TiO<sub>2</sub> does not evidently influence the evolution of inclusions. As a result, it can hardly weaken the removal efficiency of inclusions, while the cleanliness of steel is in fact improved. Lower total oxygen and nitrogen contents are obtained, and the number density of inclusions decreases from 31.7 mm<sup>−2</sup> to 25.0 mm<sup>−2</sup>.</p>\",\"PeriodicalId\":18613,\"journal\":{\"name\":\"Metallurgical and Materials Transactions B\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-06-27\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Metallurgical and Materials Transactions B\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1007/s11663-024-03181-4\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Metallurgical and Materials Transactions B","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1007/s11663-024-03181-4","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Effect of TiO2 Addition in Ladle Slag on Evolution of Nonmetallic Inclusions in Ti-Bearing Al-Killed Steel
To investigate the effect of TiO2 in refining slag on the nonmetallic inclusions in Ti-bearing Al-killed steel, industrial studies are conducted with and without TiO2 addition in refining slags. It is found that a suitable addition of TiO2 (around 5 pct) can improve the fluidity of the slag. When using TiO2-containing slag, the Ti content in steel increases to 72 ppm after LF refining due to [Ti]-[O] equilibrium, and the yield of Ti-Fe alloy also climbs from 86.5 to 96.3 pct in RH refining even with a lower addition amount. The inclusions generally transform from Al2O3 into solid MgO-Al2O3 and even liquid CaO-Al2O3 inclusions. Although a small amount of TiOx is generated in inclusions at the middle stage of LF refining due to the effect of TiO2-containing slag, solid MgO-Al2O3 inclusions are still the dominant inclusions in steel after RH refining. Therefore, the suitable addition of TiO2 does not evidently influence the evolution of inclusions. As a result, it can hardly weaken the removal efficiency of inclusions, while the cleanliness of steel is in fact improved. Lower total oxygen and nitrogen contents are obtained, and the number density of inclusions decreases from 31.7 mm−2 to 25.0 mm−2.
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