Based on classical theory for oxygen lance design it is obtained of oxygen lance nozzle with 5 holes for 180 t converter the diameter of inlet 55 mm
the diameter of throat 37. 2 mm
the diameter of outlet 50. 8 mm
the length of contracting section 44. 6 mm
the length of expanding section 97. 2 mm and the length of throat 5 mm ; with using CFD fluid imitation software to simulate the injecting fluid field of oxygen lance with 13°- 17° nozzle at same environmental temperature
it is obtained for 180 t converter the optimum nozzle angle is 15°its injecting fluid has stronger immersion ability and larger effective impact area.