Pismaryov K. Development of argon mixing theory and implementation of secondary steelmaking and casting of ultra-low carbon steels technology.- Manuscript

Object - processes of metal refining at his blowing out by an argon, and also metal and slag mixing in a ladle, tundish and mold of CCM. Purpose - development of theory of blowing out of metal by an argon and perfection of technology of laddle treatment and casting of lowcarbon steels, followed on the receiving of metal with low maintenance of injurious allow and nonmetallics inclusions by prevention of hit them in a metal in ladle and tundish, and also during the technological flowings. Research methods and equipment - lthe theoretical and experimental methods of researches, which are based on the substantive provisions of theories of metallurgical processes, mass transfer processes and similarity; laboratory researches of character and efficiency of the forced mixing of liquid are executed in a laddle, tundish and mold of CCM on physical models; for research of processes of motion of flows in a ladle and mold a mathematical modelling was used; at the mathematical model of processes of motion of flows in a ladle and mold and statistical processing of data used PEVM; industrial researches of efficiency of pinch-off of slag and refining are executed became in a ladle and industrial verification of results of theoretical analysis, mathematical and physical model. Theoretical and practical results - actual scientific and technical task is decided on development of theory of blowing out of metal by an argon and it was become perfection of technology of ladle treatment and casting, directed on the receiving of metal with low maintenance of injurious allows and nonmetallics inclusions by prevention of hit them in a metal in ladle and tundish, and also during the technological flowings. Developed and mastered technology of production of lowcarbon steels, maintenance of carbon is attained 0,006-0,020%. Novelty: scientific knowledges got further development of dynamics of blowing out of metal by an argon through jets, located in the bottom of ladle; it is set that in the conditions of blowing out of metal in a ladle a capture and involving deep into of liquid bath of large inclusions takes a place an argon by the formed flows; the industrial estimation of influence of flowing speed is first executed became from a ladle in a tundish (capacity of ladle of 300 т) on efficiency of pinch-off of slag; got further development of picture of efficiency of delete of large nonmetallicss at blowing out became an argon through blowing beams, set in the bottom of CCM tundish; scientific pictures got further development of distribution of flows of metal in mold of slab CCM. The degree of implementation - implemented the recommendations in the conditions of converter workshop of JSK "Alchevskiy metallurgical works". Area of use - metallurgy.