| 摘要 |
<P>PROBLEM TO BE SOLVED: To correctly predict whether or not inclusions and bubbles forming a surface defect are present in a slab, and to predict the quality of a surface layer of a cast slab taking into consideration generation of defects caused by degradation of cleanliness of molten steel. <P>SOLUTION: A method for predicting the quality of a cast slab surface layer includes: a flow rate calculating step of acquiring the temperatures at the measurement positions through a plurality of thermocouples 10 disposed on a casting mold 1, and calculating the flow rate of the molten steel on a solidifying shell interface from the acquired temperatures; an adhesion determining step of comparing the preset washout critical flow rate of inclusions and bubbles with the flow rate of the molten steel calculated in the flow rate calculating step, and determining presence of inclusions and bubbles possibly forming any surface defect on a solidifying shell corresponding to the measurement position under the condition that the calculated flow rate of the molten steel is below the wash-out critical flow rate; and a drift detection step of calculating the degree of the drift from the flow rate of the molten steel calculated in the flow rate calculating step, and determining presence/absence of generation of any slab defect associated with the drift based on the degree of the drift. <P>COPYRIGHT: (C)2012,JPO&INPIT |
