Purification of IF Molten Steel With Dispersed In-Situ Phase Induced by Composite Ball Explosive Reaction

The production of high purity steel is a major task for the iron and steel enterprises in the 21(st) century. Decreasing the total oxygen content and the inclusion removal is the key technique to produce the high purity IF steel. In the present investigation, a novel fine inclusion removal technology due to the dispersed in-situ phase induced by the composite ball explosive reaction was put forward. A composite ball with this function has been designed and prepared using a laboratory model batch type balling disc (at 12 rpm) and the composite ball has been fed at the end of RH refining. The results indicate that feeding composite ball in RH furnace is a novel technology and the inclusion in the molten steel can be removed effectively. The treatment time is less than 10 minutes. Compared with conventional inclusion removal technology, the number of the oxide inclusion can be decreased to a lower level and the inclusion size becomes finer. Using this novel technology, the total oxygen in the as-cast slab can approach to 6ppm and the steel production cost for per ton can be reduced by 5-10 yuan.