Abstract: Based on the theoretical analysis of thermodynamics and kinetics of adding nitrogen by blowing nitrogen,application study of F92 blowing nitrogen alloying technology had been carried out by using titanium slag furnace as a byproduct of liquid semisteel smelting,and then blowing nitrogen alloying process control conditions for LF refining,VD treatment,and supplementary blowing nitrogen had been proposed.The purification effect was significant after nitrogen adding by blowing nitrogen during LF refining process,VD continued blowing nitrogen and decompression nitrogen release treatment.The nitrogen content in the F92 steel can be stabilized in the target composition of 380×10^-6~450×10^-6,with high cleanliness and no defect in bloom,which fully meets the requirements of ASME SA-182/SA-182 M-2010.