Abstract: In this study, the distribution of inclusions at different depths beneath the shell surface was analyzed by auto-SEM. Water simulations and numerical simulation measurements were conducted to reveal the mechanism of inclusions captured by hooks. The results show that the inclusions are maximizing at 1－3 mm depths from the slab surface. Three kinds of inclusion movements in hook region were found: captured by the meniscus, captured below the meniscus and some of captured inclusions return to liquid steel. Most of the inclusions were captured near the meniscus which may lead to the highest inclusions amount near the surface of slab. Additionally, the number of inclusions captured by hooks will reduce with increasing the casting speed and casting temperature.

Key words: IF steel；hook, inclusion;initial solidification