2012 July Issue
Full Table of Contents

Ladle Metallurgy & Continuous Casting

This work provides a review of the process and product parameters of the commissioning and start-up of a new jumbo bloom continuous caster for specialty steels. Included are casting features, metallurgical analysis and a discussion on the potential of the continuous casting products to replace ingots for large sizes.

High-speed thin-slab casters continue to increase cast steel quality and production rates and thus place increased demands on primary cooling systems. A new approach has been developed that maximizes mold cold face cleanliness and reduces potential for casting defects.

Nozzle clogging induces asymmetric surface flow, causing vortex formation and inclusion defects. This work applies computational and experimental approaches. The resulting increase in the asymmetries of the surface flow velocities, velocity time variations and vortex occurrence frequency on opposite sides of the mold are quantified.

Romchat Chairaksa (middle left), Kazuyo Matsubae (middle center), Takahiro Miki (middle right) and Tetsuya Nagasaka (bottom left), Graduate School of Engineering, Tohoku University, Sendai, Japan In this study, the dust generated during normal EAF operations was returned to the EAF by injection, and the regenerated dust was collected by using a bag filter. The dust injection technology was determined to be very effective in reducing the dust treatment burden by decreasing the quantity and enhancing the quality of the regenerated dust.