Hyundai Steel Company

Hyojoong Kwon

Jutae Choi

Kaeyoung Lee

Sukhyun Yoo

Wonjae Cho

Kyoungho So

Jinsoo Jang

Hongkil Moon

Jaehwan Ahn

Disclosed is a method of predicting surface quality of a thin slab hot rolled coil. The method includes calculating the Cu equivalent (Cu eq.) of molten steel, applying the calculated Cu equivalent of the molten steel into an equation: 120&#xd7;(Cu equivalent)&#x2212;6&#xd7;(Cu equivalent) to calculate a surface crack index, and predicting the generation of surface defect of the thin slab hot rolled coil by the surface crack index. A method of producing the thin slab hot rolled coil using the same is also provided. The surface crack defect of the thin slab hot rolled coil can be predicted by calculating the Cu equivalent of the molten steel, and thus a thin slab which meets the quality standard demanded by a consumer can be provided, and this results in increased productivity and product reliability.

Method for predicting surface quality of thin slab hot rolled coil and method for producing thin slab hot rolled coil using the same

The present invention relates to an apparatus for centering a submerged entry nozzle. The present invention includes: a plurality of laser beam generatorsthat is disposed above a moldfor continuous casting to radiate a laser beam toward the center of the mold; a tundish moving unitthat moves a tundishabove the mold; and a control unit that is linked with the laser beam generatorsand controls the tundish moving unitto center the installation position of the submerged entry nozzleprovided at the lower portion of the tundish, in response to signals transmitted from the laser beam generators. According to the present invention, in addition to accurately and quickly centering the submerged entry nozzle, it is possible to maintain the submerged entry nozzle that has been centered, such that it is possible to minimize a channeling phenomenon of molten steel. Accordingly, it can be expected to improve the quality of a slab.

Centering submerged entry nozzle for continuous casting of metal slab

Growing community of inventors

Gwangju-si, South Korea

Hyojoong Kwon