Gas protection method applied to pouring process of middle column pipe and device thereof

Abstract

The invention provides a gas protection method applied to a pouring process of a middle column pipe and a device thereof. The method comprises the following steps of step 1, when molten steel does notflow into a steel ladle, introducing inert gas into the steel ladle through a vent at the bottom of the steel ladle until the molten steel completely flows into the steel ladle, wherein the gas blowing direction of the inert gas is similar to the horizontal tangential direction of the rotational flow of the molten steel; step 2, stopping introducing the inert gas into the vent, and feeding the purified molten steel in the steel ladle into a molten steel tundish through the vent; and step 3, opening a water port at the bottom of the molten steel tundish so as to inject the molten steel in themolten steel tundish into a crystallizer for solidification forming. Compared with a conventional pouring process of the middle column pipe, the gas protection method has the advantages that the steelladle is arranged at the outer side; the molten steel realizes rotating flowing through gas driving, so that the collision enlarging of inclusions is promoted; the upward floating removal of the inclusions is facilitated; and the removal efficiency of the inclusions is greatly improved.

Description

technical field [0001] The invention belongs to the field of metallurgical technology and devices thereof, and in particular relates to a gas protection method and a device thereof applied in the pouring process of a central column tube. Background technique [0002] In the prior art, when pouring steelmaking, due to the direct contact between the poured molten steel and the air, it will cause secondary oxidation of the poured molten steel, resulting in a decline in the quality of steelmaking. Gas shield, which can prevent the quality decline caused by the secondary oxidation of molten steel to a certain extent, but the conditions in the cavity cannot be observed, resulting in reduced reliability; and due to the limited height of the pick-and-place opening, it cannot It further cooperates with the output port of the molten steel pouring device, so that the material is often ejected to the outside of the shell during pouring, which affects the reliability of use; and the posi...

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Problems solved by technology

[0002] In the prior art, when pouring steelmaking, due to the direct contact between the poured molten steel and the air, it will cause secondary oxidation of the poured molten steel, resulting in a decline in the quality of steelmaking. Gas shield, which can prevent the quality decline caused by the secondary oxidation of molten steel to a certain extent, but the conditions in the cavity cannot be observed, resulting in reduced reliability; and due to the limited height of the pick-and-place opening, it cannot It further cooperates with the output port of the molten steel pouring device, so that the material is often ejected to the outside of the shell during pouring, which affects the reliability of use; and the position of the connecting pipe is fixed, because it cannot be rotated and adjusted, causing it to be in contact with the argon gas. It is very troublesome to move the whole shell when manufacturing or matching the storage device

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