size of bubbles was in the range of 100-1000 um,with an average of about 500 um.The bubbles were more dispersive at the exit of ladle shroud and its lower position,with a density of 15.2 per square centimeter.Moreover, it was observed that,for part of bubbles,a bubble could adhere to an inclusion,even multiple inclusions.The adhesion of bubbles to Al2O3 inclusions was higher than that to CaO(-MgO)-Al2O3-SiO2 complex inclusions. KEY WORDS bubble;inclusion;tundish;ladle shroud;argon injection 非最终出版稿 录用稿件 收稿日期 项目基金：国家自然科学基金(51874028size of bubbles was in the range of 100-1000 μm, with an average of about 500 μm. The bubbles were more dispersive at the exit of ladle shroud and its lower position, with a density of 15.2 per square centimeter. Moreover, it was observed that, for part of bubbles, a bubble could adhere to an inclusion, even multiple inclusions.The adhesion of bubbles to Al2O3 inclusions was higher than that to CaO(-MgO)-Al2O3-SiO2 complex inclusions. KEY WORDS bubble ; inclusion ; tundish ; ladle shroud ; argon injection 收稿日期： 项目基金：国家自然科学基金(51874028) 录用稿件，非最终出版稿