Oxygen lance nozzle and method for shortening smelting period of converter

The invention relates to the technical field of converter steelmaking, in particular to an oxygen lance nozzle and a method for shortening the converter smelting period. The oxygen lance nozzle is provided with a central hole and five circumferential holes, and the included angle between the throat of the central hole and the throat of each circumferential hole is 14-17 degrees; the method for shortening the smelting period of the converter comprises the step of blowing by using an oxygen lance nozzle with a circumferential hole and a central hole. A whole set of optimized scheme is formed by designing the 5 + 1 hole oxygen lance nozzle, optimizing the structure of the oxygen lance nozzle holes, improving the working oxygen pressure and the oxygen flow of the oxygen lance, controlling the adding time and the adding amount of flux slag charge and adjusting the blowing lance position, so that the pure blowing time of a 210t converter is shortened to 12-14 minutes from 16-18 minutes, the blowing time of steel in