DENITROGENATION OF STEEL MELTS WITH OXYGEN AND SULFUR BY INJECTION OFARGON UNDER REDUCED PRESSURE

Denitrogenation of steel melts with oxygen and sulphur was studied und er reduced pressure by injection of argon. The rate of nitrogen desorp tion was found to obey a reaction of second order. The macrokinetic ra te increases with increasing Ar flowrate until bubble coalescence occu rs in the melts. The effects of sulphur and oxygen on nitrogen desorpt ion were evaluated from the experimental data. The dimensionless rate constant far nitrogen is described by k(N)(F) = 1.11 (1 + 160aO(0) + 1 40aS)(-1/2) - 0.11. A reasonable agreement was obtained in comparison with the results of other investigators.