《工程科学学报》录用稿，htps:/doi.org/10.13374/i,issn2095-9389.2021.09.15.009©北京科技大学2020 长水口吹氩生成微小气泡工业实验研究 刘建华”，李巍”，何杨☒，苏晓峰”，张杰，常芙蓉) 北京科技大学高效轧制与智能制造国家工程研究中心，北京100083 2) 北京科技大学治金与生态工程学院，北京100083 ☒通信作者，E-mail:heyang2020@ustb.edu.cn 鮰蛔鮰蛔本研究在连铸生产中采用大流量长水口吹氩，并采用“冷钢片沾钢法”沾取中间包钢液试样， 成功沾取了中间包钢液中微小氩气泡。冷钢片沾样表面气泡为中间包上部钢/渣界面和炉渣中氩气泡，尺 寸主要位于1.0-3.0mm,但该尺寸不能反映中间包钢液内部长水口吹氩生成气泡，冷钢片沿样内部气泡为 钢液内部长水口吹氩生成的气泡。结合扫描电镜和共聚焦显微镜对沾取试样内部气泡彩织？寸和数量进 行了分析，结果表明大部分气泡为独立圆形气泡，偶见少量粘连和聚合气泡：钢液内部金气泡尺寸主要位 于100-1000m,平均尺寸为500m左右：气泡在长水口出口及其下方较为弥散，气泡密度可达15.2 个m。采用扫描电镜结合能谱分析，发现部分气泡内粘附有夹杂物，有些气泡粘附多个夹杂物：气泡粘 附AlO,夹杂物的几率高于粘附CaO(-MgO)AlOg-SiO2复合夹杂物的几帝 鮰蛔鮰气泡：夹杂物：中间包：长水口：吹氩 鮰蛔蛔TF769.4 Industrial experimental study onthmation of mcro bubbles by argon injetion ino lalle hro LIUJian-hua,lWer.HE Yang)☒， SU Xiao-feng ZHANG Jie)CHANG Fu-rong) 1)National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing,University of Science and Technology Beijing,Beijing 100083,China 2) School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China 3) Corresponding author,F heyang2020@ustb.edu.cn ABSTRACT Using bubbles to remove inclusions in steel is now becoming one of the important means of refining.It has become a consensus that fine bubbles have better effect on inclusion removal than the big bubbles. The fine bubble ean be formed in molten steel by the argon injection into ladle shroud technology.There are two stages during the formation process of fine bubbles in ladle shroud:bubble detachment in wall orifice and detached bubbles being split into smaller ones in turbulent steel.There exist many reports on water model of the argon injection into ladle shroud technology,but the industrial experimental research is just beginning.In this study,the injection of large argon flow into ladle shroud was adopted in continuous casting production in order to produce fine argon bubbles in tundish,and the bubbles were captured by dipping a cold steel sheet into molten steel.The captured bubbles at the surface of hot-dipped steel sheet,with a size of 1.0-3.0 mm,characterized the argon bubbles at steel/slag interface and slag phase in the upper part of tundish instead of those inside molten steel in tundish.The latter could be characterized by the captured bubbles in the interior of hot-dipped steel sheet,and their morphology,size,and number were analyzed by scanning electron microscopy and confocal microscopy.The bubbles inside molten steel in tundish generally had a spherical shape and occasionally adhered to each other.The 收稿日期： 项目基金：国家自然科学基金(51874028)长水口吹氩生成微小气泡工业实验研究 刘建华 1) , 李 巍 1) , 何 杨 1), 苏晓峰 1) , 张 杰 2) , 常芙蓉 1) 1) 北京科技大学高效轧制与智能制造国家工程研究中心, 北京 100083 2) 北京科技大学冶金与生态工程学院, 北京 100083  通信作者, E-mail: heyang2020@ustb.edu.cn 摘 摘 本研究在连铸生产中采用大流量长水口吹氩，并采用“冷钢片沾钢法”沾取中间包钢液试样， 成功沾取了中间包钢液中微小氩气泡。冷钢片沾样表面气泡为中间包上部钢/渣界面和炉渣中氩气泡，尺 寸主要位于 1.0-3.0 mm，但该尺寸不能反映中间包钢液内部长水口吹氩生成气泡，冷钢片沾样内部气泡为 钢液内部长水口吹氩生成的气泡。结合扫描电镜和共聚焦显微镜对沾取试样内部气泡形貌、尺寸和数量进 行了分析，结果表明大部分气泡为独立圆形气泡，偶见少量粘连和聚合气泡；钢液内部氩气泡尺寸主要位 于 100-1000 μm，平均尺寸为 500 μm 左右；气泡在长水口出口及其下方较为弥散，气泡密度可达 15.2 个/cm2。采用扫描电镜结合能谱分析，发现部分气泡内粘附有夹杂物，有些气泡粘附多个夹杂物；气泡粘 附 Al2O3夹杂物的几率高于粘附 CaO(-MgO)-Al2O3-SiO2复合夹杂物的几率。 摘摘摘 气泡；夹杂物；中间包；长水口；吹氩 摘摘摘 TF769.4 Industrial experimental study on the formation of micro bubbles by argon injection into ladle shroud LIU Jian-hua1), LI Wei1), HE Yang1) , SU Xiao-feng1), ZHANG Jie2), CHANG Fu-rong1) 1） National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, University of Science and Technology Beijing, Beijing 100083, China 2） School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 3）  Corresponding author, E-mail: heyang2020@ustb.edu.cn ABSTRACT Using bubbles to remove inclusions in steel is now becoming one of the important means of refining. It has become a consensus that fine bubbles have better effect on inclusion removal than the big bubbles. The fine bubbles can be formed in molten steel by the argon injection into ladle shroud technology. There are two stages during the formation process of fine bubbles in ladle shroud: bubble detachment in wall orifice and detached bubbles being split into smaller ones in turbulent steel. There exist many reports on water model of the argon injection into ladle shroud technology, but the industrial experimental research is just beginning. In this study, the injection of large argon flow into ladle shroud was adopted in continuous casting production in order to produce fine argon bubbles in tundish, and the bubbles were captured by dipping a cold steel sheet into molten steel. The captured bubbles at the surface of hot-dipped steel sheet, with a size of 1.0-3.0 mm, characterized the argon bubbles at steel/slag interface and slag phase in the upper part of tundish instead of those inside molten steel in tundish. The latter could be characterized by the captured bubbles in the interior of hot-dipped steel sheet, and their morphology, size, and number were analyzed by scanning electron microscopy and confocal microscopy. The bubbles inside molten steel in tundish generally had a spherical shape and occasionally adhered to each other. The 收稿日期： 项目基金：国家自然科学基金(51874028) 《工程科学学报》录用稿，https://doi.org/10.13374/j.issn2095-9389.2021.09.15.009 ©北京科技大学 2020 录用稿件，非最终出版稿