How to Improve the Use Efficiency of Ladle Blowing Argon

1. Improve the masonry process. Check the ventilation bricks before repairing the tank, and make sure that the working surface of the ventilation bricks is not lower than 30mm at the bottom of the tank to avoid cold steel; check whether the metal hose is burnt out and whether the 2-head screws are loose. In order to ensure the strength of argon blowing and reduce the infiltration and blockage of molten steel, use a feeler gauge to check the air passage of the breathable brick slit before masonry, and select a breathable brick with an air passage width suitable for the working conditions; check the tail pipe of the breathable brick before masonry Whether the thread is damaged. Make sure that the tail pipe does not enter the dust and debris during the process of building the breathable brick. After the ladle is repaired, the waste at the head of the breathable brick should be cleaned up.

2. Careful use. During the use of the breathable brick, the flow of argon gas is strictly controlled at different processing stages to avoid the corrosion of the bottom-blown breathable brick accelerated by the large flow of bottom blowing. During the use process, the connection of the gas pipeline is often checked and found Leakage of the joint is dealt with immediately to avoid gas leakage, which will cause the pressure in the pipeline to drop, resulting in the failure of bottom blowing.

3. Strengthen the protection of air-permeable bricks. Because the bottom-blown air-permeable bricks are corroded, the concave parts are easy to accumulate steel and condense. After the steel is poured, the gas source (argon or compressed air) is immediately connected to the large ladle turntable, and there is no gas in the blowing air passage. Condensed infiltrated steel and accumulated steel in the depression of bottom-blown breathable bricks. After the ladle is turned over and the slag is poured, lift it to the hot repair area and put it down, and then connect the quick connector to test the flow of breathable bricks with compressed air or argon. When the flow rate requirement is reached, the quick connector can be pulled out without treatment or slender treatment; if the flow rate cannot meet the requirements, the oxygen-burning back-flushing method is adopted. Or the coal-oxygen gun to remove the cold steel cold slag remaining on the working surface of the permeable brick until the flow rate of the permeable brick reaches the requirements. On the premise of ensuring that the flow rate and blowing rate of the permeable brick meet the requirements, oxygen burning for a long time should be avoided as much as possible. The distance between the front end of the gun and the working surface of the breathable brick is kept at about 50mm. The closer the distance, the longer the oxygen burning time, which will accelerate the melting loss of the working face of the breathable brick, and then artificially reduce the service life of the breathable brick.