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Inclusion is a big problem during the production of high-performance steels, as they can greatly influence the micro structure and structural properties. They’re often considered as harmful to the final roll product, so that many industrial efforts are contributed to remove inclusions in steel. Another, more positive approach is to use nonmetallic inclusions to produce steels with enhanced or tailored properties. In both cases, the main problem is to control the characteristics of the inclusion population in steel, such as number, composition, morphology, size and spatial distribution.1) Whether the researcher focuses on theoretical analysis or engineering, modern techniques are essential for the study of this issue. Using metallographic microscope, Warzecha2) investigated the inclusion size and amounts through different tundish configurations; Using SEM coupled with EMPA, Sengupta3) showed a high resolution picture of the shapes of bubbles and inclusions near the hook. Recently, based on ASPEX, Ren4) studied the inclusion morphology changes during different stages of deoxidation. All these works are beneficial for understanding the inclusion distribution in slab, however, due to technical limit, they can only reveal the inclusion distribution in a partial area. Ultrasonic inspection5–7) and X-ray detection8) are more efficient than In-situ Analysis and Numerical Study of Inclusion Distribution in a Vertical-bending Caster

<i>In-situ</i> Analysis and Numerical Study of Inclusion Distribution in a Vertical-bending Caster