Authors: Ho Y.-H.¹; Chen C.-H.²; Hwang W.-S.³

Source: Ironmaking & Steelmaking, Volume 28, Number 3, June 2001 , pp. 258-265(8)

Publisher: Maney Publishing

Abstract:

The purpose of this study is to develop a three-dimensional (3D) analysis system capable of analysing the flow field of molten steel in the slab continuous casting mould with rotated ports in the submerged entry nozzle. The ultimate goal is to obtain the optimal design for the entry ports of the submerged nozzle, which can introduce favourable flow patterns to remove non-metallic inclusions and avoid entrapment of molten slag and casting powder to produce steel slab of high cleanliness. In this study, a computational fluid dynamics technique, Sola-Surf, is employed to conduct the 3D fluid flow analysis. The technique has the capability of treating fluid flow problems with a free surface that slightly vibrates. The slightly vibrating free surface presents fairly accurately the behaviour of the molten slag–casting powder layer in the continuous casting mould. The developed simulation system is then tested on a slab continuous casting mould to analyse the fluid flow behaviour of molten steel under various nozzle designs. The design conditions include submerged depth of the nozzle, tilted angle of the nozzle port, and rotated angle of the nozzle port. The results of the simulations show that of the various design factors rotation of the nozzle entry ports has the greatest effect on the flow pattern. It can prolong the residence time of the molten steel and stabilise the molten slag–casting powder layer, which is very favourable for obtaining continuous casting slag of high cleanliness.

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1179/030192301678127

Affiliations: 1: The Department of Information Management, DiWan College of Management, Tainan, Taiwan 2: The Steelmaking Department, China Steel Corp, Kaohsiung, Taiwan 3: The Department of Materials Science and Engineering, National Cheng Kung University, Tainan, Taiwan 70101

Publication date: 2001-06-01

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