| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and a device for predicting and detecting defect in a cast slab, capable of predicting and detecting any alumina-like defect in the cast slab to be continuously cast, a method for manufacturing the continuously cast slab using the device, and a continuous casting apparatus having the device. <P>SOLUTION: In the method for predicting and detecting any defect in a cast slab, the level of molten steel in a mold is detected to change the charging rate of the molten steel; and production of any alumina-like defect in the cast slab to be continuously cast while blowing in inert gas such as argon gas in the molten steel from an upper nozzle 5 provided to the bottom of a tundish 3, is predicted and detected. Any vertical change of the back pressure of the inert gas is detected, and production of any defect is predicted and detected by determining whether or not the change of the back pressure follows the change of the molten steel charging rate depending on the fact whether or not the cases of the predetermined number or more that the change is equal to or more than the predetermined range are present within the predetermined time. A method for manufacturing the continuously cast slab using the device and the method, and a continuous casting apparatus having the device are also disclosed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
