A method for controlling the drainage sand into the tundish in the continuous casting process

Abstract

A method for controlling drainage sand into the tundish during the continuous casting process, belonging to the field of steel continuous casting; method: 1) before the completion of the previous furnace ladle pouring, pour the unpoured ladle with drainage sand on the standby position of the ladle rotary table , blow inert gas into the molten steel through the breathable nozzle seat brick at the bottom of the ladle; when the ladle rotates on the ladle turntable to an angle of 20° to 50° with the ladle pouring position, stop rotating; 2): Place scrap steel under the ladle nozzle Tank, continuous air blowing from the beginning of blowing in inert gas to the first stop of rotation, so that the temperature of the molten steel directly above the breathable nozzle seat brick increases by 2 to 5°C, the sliding nozzle is opened for the first time, and the drainage sand and a very small amount are discharged Molten steel; when all the diversion sand is discharged, close the sliding nozzle; 3) Keep blowing in inert gas, quickly rotate the ladle to the pouring position, connect the long nozzle of the large ladle, open the sliding nozzle a second time, and start pouring normally; the ladle starts to open normally. After pouring, stop blowing inert gas.

Description

technical field

[0001] The invention belongs to the field of continuous casting of iron and steel, and in particular relates to a method for controlling drainage sand to enter a tundish in a continuous casting process. Background technique

[0002] In the continuous casting production process, it is usually necessary to use ladle drainage sand for drainage, that is, add drainage sand to the upper nozzle of the ladle. When the sliding nozzle slide plate is opened, the drainage sand will fall due to the pressure of the molten steel, and the molten steel will automatically flow out with the drainage sand. flow out. After the molten steel is automatically poured, the drainage sand will also enter the tundish. Due to the large size of the drainage sand, if it cannot be removed in time, it will react with the molten steel to form large inclusions in the steel, which will seriously pollute the molten steel and significantly deteriorate the casting. Blank and product quality. [0...

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