The 260 ton top blown converter in Anshan Iron and Steel Group Corporation is taken as the research object to carry out new double-structure oxygen lance melting commercial test. The key metallurgical parameters of six typical continuous heats are analyzed and discussed

and the results are compared with those of traditional oxygen lance nozzle. Results show that the inclination angles of the big and small nozzles for the new double-parameter oxygen lance are designed as 12° and 17° respectively

and the flow rate of the big nozzles accounts for 60%

the average oxygen blowing time of the new oxygen lance is approximately 1 min shorter than that of the current oxygen lance when the composition of molten iron

tapping composition and smelting steel are the same. The iron and steel charge consumption per ton of steel decrease by 20. 3 kg

and the average oxygen supply intensity increases by 0.23 m

3

/( t • min).