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Non-metallic particles in liquid steel are generated during deoxidization. Complete removal of these particles is difficult and expensive in practice. Mostly, non-metallic particles are considered to be detrimental to the mechanical properties of steel due to their different properties than the steel matrix, such as plasticity. Compared with spherical particles, hard non-deformable particles of irregular shape are more prone to initiate cracks due to local concentration of internal stresses, which can considerably decrease steel mechanical properties, such as ductility, toughness and fatigue strength.1–4) Moreover, soft particles of irregular shape, such as sheet-like and rod-like MnS particles, are more deformable during hot rolling, which can result in reduced mechanical properties especially in the transverse direction.4–6) Therefore, the morphology of non-metallic particles in steel products should be controlled. The morphology of a crystal is intrinsically determined by its internal crystal structure.7) However, external factors, such as supersaturation degree, holding time, temperature, stirring, impurities and solvent, can change the growth rates of individual faces and hence modify the morphology.7) In Al-killed steel, alumina particles exhibit various morphologies, such as dendritic, spherical, faceted, plate-like, and clustered.8) Moreover, faceted alumina particles show irregular, octahedral and truncated octahedral morphologies, largely deviating from the rhombohedral morphology expected from the crystal structure. This suggests that the morphology of alumina particles is affected by external factors during deoxidation. Studies of factors influencing Effect of Impurity Te on the Morphology of Alumina Particles in Molten Iron