Aiming at the poor smelting slag and serious problem of oxygen lance stick slag and steel in the low silicon content hot metal,according to the theory of compressible fluid and the interaction prin-ciple of jet and molten pool,a 5-hole oxygen nozzle was designed and developed.The main techno-logical parameters are as follows:the angle of the hole is 13°,the Ma is 2.0,the throat diameter is 36.8mm,the outlet diameter is 47.8mm,the design oxygen pressure is 0.80MPa,the design oxygen supply strength is 3.8m3/(min·t).The gun position is 1.3～1.9 m,and the impact depth,im-pact area and mixing time of molten pool are in the reasonable range.Production practice shows that u-sing 5 hole nozzle the blowing time decreases by 0.5 min,the oxygen consumption decreases by 1.1 m3/t,dephosphorization rate increases by 4.1 percentage points,the content of FeO in the final slag decreases by 1.2 percentage points,the percent of tapping steel for once turning converter increases by 1.7 percentage points,and the problems existing in the converter smelting for the low silicon hot metal are solved basically,the technique indexes of converter improve obviously.
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