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Steel cleanliness is a major issue in the production of high performance steel grades. To improve steel cleanliness, the content of impurity elements, such as phosphorus, sulfur, total oxygen, nitrogen and hydrogen, should be controlled.1) Also the number, size, size distribution, morphology and spatial distribution of non-metallic inclusions are important.2) As non-metallic inclusions can deteriorate steel mechanical properties,3,4) their maximum size is restricted in many steel grades.5) After nucleation, non-metallic inclusions grow through diffusion, Ostwald ripening and collision.6,7) Nucleation and growth by turbulent collision are important from the viewpoint of trying to control inclusion size. Some studies show that a low interfacial energy between inclusions and liquid steel favors a high nucleation rate, which could lead to small inclusions and a narrow size distribution.6,8,9) Growth by turbulent collision could strongly increase inclusion size due to collision and agglomeration of inclusions, i.e., clustering.10) Due to their large size, clusters can float up more easily to the top slag phase. They are, however, very detrimental to steel properties if they remain in solidified steel. Clustering of non-metallic inclusions in liquid steel, especially of alumina inclusions, has long been known.10) Experiments were carried out, focusing on influencing factors, such as inclusion type, temperature, holding time, stirring and initial oxygen content.10–15) Clustering was found to occur mainly among inclusions that can not be wetted by Effect of Interfacial Properties on the Characteristics and Clustering of Alumina Inclusions in Molten Iron