METHOD FOR PREDICTING QUALITY OF SLAB

摘要

The present invention relates to a slab quality prediction method, and provides a step for periodically collecting the level values of the short side and center parts of molten steel according to the flow of the molten steel in a mold; a step for calculating the fluctuation rate of the molten steel level ( ) by using the abnormal number passing the reference range of the values of the molten levels of the center part and the total number of measurements that are collected during a unit cycle after a the predetermined unit cycle passes; a step for obtaining the fluctuation ratio of the molten steel level by using the ratio of the value of the molten steel level on the side part of a tundish and the value of the molten steel level of the center part depending on casting conditions, and for measuring the depth ( ) of the powder pool of the short side part of the tundish; a step for a reference carbon pick-up index of the slab by using the fluctuation rate of the molten steel, the fluctuation ratio of the molten steel level, and the depth of the powder pool of the short side part; and a step for predicting quality by determining whether the predicted carbon pick-up index compared with a reference carbon pick-up index is less than the reference carbon pick-up index or not. [Reference numerals] (AA) Start;(BB) End;(S10) Periodically collect the level values of the short side and center parts of molten steel;(S20) Calculate the fluctuation rate [MLn] of the molten steel based on the collected level values of the short side and center parts of molten steel;(S30) Obtain the fluctuation ratio [a_i] of the molten steel level by using the ratio of the value of the molten steel level on the short side part and the value of the molten steel level of the center part;(S40) Obtain the depth (H_i) of the powder pool of the short side part of the tundish;(S50) Estimate a carbon pick-up index of the slab by using the fluctuation rate of the molten steel, the fluctuation ratio of the molten steel level, and the depth of the powder pool of the short side part;(S60) Estimated carbon pick-up index > Reference carbon pick-up index ?;(S70) Stay until a re-analysis process is performed for analyzing the slab's components;(S71) Input the slab to the next process [rolling]