RH refining device and method for promoting deep decarburization of molten steel

Abstract

The invention relates to an RH refining device and method for promoting deep decarburization of molten steel, and relates to the technical field of refining outside a molten steel furnace. The devicecomprises a vacuum chamber, an ascending dip tube, a descending dip tube, a ladle, a weir wall, an argon blowing tube and a top blowing oxygen gun. The top of the vacuum chamber is equipped with the top blowing oxygen gun, the bottom of the vacuum chamber is connected to the ascending dip tube and the descending dip tube, and the weir wall is installed at an outlet of the ascending dip tube at thebottom of the vacuum chamber. The ascending dip tube is provided with an argon blowing tube and communicates with gas. The ascending dip tube and the descending dip tube are inserted into the moltensteel in the ladle, and the molten steel is circulated between the vacuum chamber and the ladle through the ascending dip tube and the descending dip tube. The RH refining device and method have the advantages that implementation is facilitated, the weir wall is conveniently maintained, the RH refining device and method can be used and promoted in a factory, and has good practical significance.

Description

technical field [0001] The invention relates to the technical field of molten steel refining outside the furnace, in particular to an RH refining device and method for promoting deep decarburization of molten steel. Background technique [0002] The RH refining technology was jointly developed by Rheinstahl and Hutlenwerke in Germany, because it effectively combines the vacuum refining technology with the circulating flow technology of molten steel. RH also has a series of advantages such as short refining treatment period, good decarburization effect, and high purity of molten steel. Therefore, it is widely used in converter steelmaking plants with fast smelting rhythm and large production capacity, and has become an important out-of-furnace refining facility. With the development of technology, RH can be used for various refining purposes such as degassing, decarburization, desulfurization, removal of inclusions, uniform temperature and composition. At present, many domes...

AI Technical Summary

Problems solved by technology

[0004] In order to achieve ultra-low carbon qualified components, many manufacturers adopt the method of prolonging the treatment time to increase the degree of reaction, or increasing the oxygen content to increase the depth of the reaction layer, but this will bring problems of low efficiency and excessive oxygen content in molten steel

Some researchers have achieved certain decarburization effects by blowing hydrogen into the RH furnace immersion tube to increase the decarburization rate, or blowing iron ore powder on the surface of molten steel to increase the decarburization reaction interface. Larger transformation, difficult to implement and maintain [1][2]

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