Abstract
In order to improve the surface quality of continuously cast slabs, especially ULC (Ultra Low Carbon) steel and TWIP (TWin Induced Plasticity) steel, the molten mold flux has been tested using the pilot continuous caster of POSCO. A furnace combined with a delivery system was fabricated for melting and feeding the mold flux into the casting mold. Various casting tests have been carried out to verify the performance of the molten mold flux technology. Heat flux from the molten steel to the cupper plate of the casting mold was measured and analyzed to compare with that of conventional solid mold flux. In addition, oscillation marks with meniscus hooks, which influence the surface quality of cast slabs, were investigated. This paper summarized the concept of the molten mold flux technology and discussed the test results using the pilot caster for ULC steel and TWIP steel.
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