Improvement of Surface Quality and Castability of Al-TRIP Steel

by Yuichi Oka, Takashi Miyake

Publisher - Kobe Steel, Ltd

Category - General Novel

High aluminum steel changes mold flux composition significantly more than conventional steel grades because of the reaction between the aluminum in the molten steel and SiO2 in mold flux during continuous casting. This composition change increases the viscosity and solidification temperature of the mold flux, so that lubrication between the shell and the mold worsens. This may result in operational troubles such as the shell sticking to the mold. Moreover, this composition change in the mold flux causes a fluctuation in the heat exacted from the mold and may result in low surface quality of slab. Particularly, in the case of Aluminum-TRIP (Al-TRIP) steel which is in peritectic grade, the deterioration of the surface quality becomes more remarkable. New mold flux was developed which can maintain lubrication and heat removal characteristics even if the chemical composition changes during casting. By using this mold flux and by changing casting conditions, a stable operation and the improvement of the surface quality of slab were achieved.

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