Characteristic of Nozzle with Step for Prevention of Uneven Flow

Abstract

The flow pattern of the molten steel in the immersion nozzle have a important effect on the quality of the slabs, 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 contraction and a step. Numerical and water model studies revealed that rectification was accelerated significantly using the new type nozzle, which would lead to the suppression of the vortex generation and turbulence on the meniscus in the mold.