Advances in lining of secondary steel ladles in India and microstructural studies of slag line refractories

摘要

The clean steelmaking demands adoption of secondary steelmaking processes coupled with continuous casting of steels in the operating plants. The processing steel ladles are, therefore, subjected to longer residence time, higher tapping temperature of steels from BOF, besides severity in operating conditions of ladle for inert gas purging from bottom and alloying of steel for adherence to quality of end products. In fact; in the steel works' of India, about 2-3 kg/tcs of refractories are consumed only in secondary steel ladles, out of total consumption of 8-9 kg/tcs of refractories consumed for maintenance / operation of metallurgical process units in modern plants. The paper highlights the zoned lining design as practiced in 30QT ladle of SMS II, Bokaro Steel Plant (Bokaro), Steel Authority of India, 160T ladle of LD Shop No. 2, Tata Iron & Steel Co. Ltd. and 130T ladle of BOF/CCS of Jindal South West Steel Ltd. (Toranagalu), pyro-physical properties and micro-structural characteristics of MgO-C bricks used in slag lines.