Relaxation of Uneven Velocity through Swirl Blade in Immersion Nozzle

Abstract

The flow pattern of the molten flow in the immersion nozzle have a important effect on the quality of the slab, billets, or blooms produced. Uneven flow in the nozzle developed after passing through a sliding gate, sometimes result in formation of vortex near the nozzle and entrapment of CC powder in the molten steel. The purpose is to suppress those uneven flow as soon as possible after passing through the sliding gate. We proposed a new type nozzle with the swirling blade. Numerical and water model studies revealed that rectification was accelerated significantly using the nozzle with the swirl blade, which would lead to the suppression of the vortex generation and turbulence on the meniscus.