Device and method for preventing secondary oxidation of molten steel

Abstract

The invention discloses a device and method for preventing secondary oxidation of molten steel, and belongs to the technical field of molten steel pouring equipment and methods. The device and methodare used for preventing the molten steel from being subjected to secondary oxidation in the pouring process. According to the technical scheme, two layers of argon shield pipelines are arranged in a steel ladle long nozzle, and the number of upper-layer gas inlet pipelines and the number of lower-layer gas inlet pipelines are 6-10; the upper-layer gas inlet pipelines are tilted upwards by 30-40 degrees in the vertical direction, and the lower-layer gas inlet pipelines are tilted by 30-40 degrees in the horizontal direction and the vertical direction; and upper-layer gas inlets and lower-layergas inlets are installed in the outer wall of a steel shell. By adoption of the device and method, the probability of secondary oxidation happening in the molten steel pouring process is eliminated through the ingenious design of dual-argon sealing and tilted direction blowing-in, the unexpected good effect is achieved, the problems which cannot be solved for a long time are solved, and molten steel pouring quality is guaranteed. According to the device and method, the structure is simple, operation is easy and convenient, occluded foreign substances generated in secondary oxidation can be reduced, the water gap blocking probability is obviously lowered, and the effect that production can be conducted smoothly is guaranteed.

Description

technical field [0001] The invention relates to a device and a method for preventing secondary oxidation of molten steel during pouring, and belongs to the technical field of molten steel pouring equipment and methods. Background technique [0002] With the development of production technology, the requirements for the quality of steel products in various industries are getting higher and higher, so the requirements for the cleanliness of molten steel for casting billets are also increasing. In the production process, the secondary oxidation of molten steel is an important factor affecting the cleanliness of molten steel. The secondary oxidation of molten steel is during the pouring process of molten steel. The molten steel in the ladle enters the tundish through the ladle shroud. At the connection between the ladle shroud and the ladle lower nozzle, air is easily brought into the molten steel to cause secondary oxidation, reducing the steel cleanliness. In addition, secon...

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Problems solved by technology

Some enterprises also adopt the cover method, that is, a box filled with argon gas is used to cover the gap between the steel flow and the tundish, but this kind of device is more complicated, the operation is difficult, and the abnormal situation in the production process is difficult to deal with

There are also some enterprises that adopt sealing bowl and argon gas sealing measures, use a sealing bowl to seal between the ladle nozzle and the ladle long nozzle, and then flush argon gas for argon sealing. This method is simpler and easier than the cover method. However, in this method, the direction of the argon gas inlet is perpendicular to the direction of the long nozzle of the ladle. When the argon is blown to seal, the argon is easy to move downward, so that the upper air is brought into the molten steel, causing secondary oxidation.

Therefore, the current measures to prevent secondary oxidation at the connection between the ladle nozzle and the ladle shroud have not achieved the desired effect, which has become a problem that restricts the improvement of molten steel quality and needs to be resolved urgently

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