The constant flow variable gun position operation is to keep the oxygen supply flow constant during the blowing process of a furnace steel, and to control the blowing by changing the position of the gun to change the interaction between the oxygen flow and the molten pool. Most manufacturers in China use a staged constant flow variable gun position operation. Oxygen lance operation is not exactly the same due to differences in converter tonnage, nozzle structure, raw material conditions, and steel grades. There are currently two lance operation modes.

1 high-low-high-low gun position mode. The open blow gun position is higher, and the initial slag is formed early. When the second batch of rice is added, the gun is lowered at the appropriate time. When the medium-term slag is returned to the dry, the gun can be added or an appropriate amount of flux can be added to adjust the slag fluidity to shorten the blowing time and the end point. Pull carbon out of steel.

2 High-low-low gun position mode. The open blow gun position is higher, and the initial slag is formed as soon as possible; the gun position is gradually reduced during the blowing process, and an appropriate amount of flux is added in the middle of the blowing to adjust the slag fluidity, and the carbon steel is extracted at the end point.