ADDITIVE FOR PREPARING STEEL CONTAINNING SUPER-FINELY DISPERSED OXIDE, PRODUCING METHOD AND APPLICATION OF THE SAME

摘要

This invention provides a secondary refining technique for steelmaking, particular an additive for preparing steel containing super-finely dispersed oxide, producing method and application of the same, which belongs to metallurgy technical field. The said additive is a composite sphere composed of core and shell. The said shell is composed mainly of calcium oxide and/or magnesium oxide. One kind of core contains mainly beneficial oxides and expanding agents, or the other kind is composed of pre-melt dreg powder agent(s) having low melting point and expanding agent(s). It can allow oxides type impurities more finely and dispersing diffusively in steel, moreover there is many formulations and of great advantage to application, through charging in LF, RH, VD or CAS-OB by applying wire-feeding, powder spraying, pellet jetting and even feed directly means. The steel containing super-finely dispersed oxide whose diameter less than 1 µm can be produced stably and rapidly, so as to greatly improve the quality of steel and lower the cost of refining.