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Hunan University of Technology School of Metallurgical Engineering 102 Zhang Tianshan 10495200221 Refining process Introduction With the development of modern scientific technology and industrial and agricultural requirements of steel quality improvement, steel has been widely used in secondary refining process, it has become an essential part of modern steelmaking process. Because of this technology can improve the steel-making equipment production capacity, improve the quality of steel,reduce energy consumption, reduce refractories, energy and iron alloy consumption, therefore, refining technology has become one of the worldsiron and steel metallurgy development direction. It is necessary to study forrefining problems and development direction of technical problems. 1 Development course and the present situation of domestic and international 1refining technology With the development of steelmaking technology, refining outside the furnacehas occupied an important position in the modern iron and steel production,the traditional production process (blast furnace, steel furnace (EAF orfurnace), casting), has been a new process (blast furnace, molten iron pretreatment, steelmaking, refining, continuous casting) replaced. Has become the main process of large-scale iron and steel enterprise production at home and abroad, especially in the field of special steel, refining and continuous casting technology matures. The refining process plays a crucial role in the whole process, hand through this process can improve the purity of steel, removal of harmful impurities, micro alloying and inclusion modification;on the other hand, refining is a buffer unit, is conducive to the balance of the continuous casting production. Japan in the nineteen seventies in order to reduce the cost of steelmaking,improve the purity and quality of steel, will take the lead in refining technologyused in special steel production in Western Europe, then the iron and steel enterprises also added to