A method to reduce high oxygen content in rh vacuum chamber

Abstract

The invention discloses a method for reducing RH vacuum chamber high oxygen content. The method specifically includes the following steps that molten steel after deoxygenation and temperature rise is hoisted to an RH vacuum refining furnace; a buggy ladle conveys a steel ladle and the molten steel to a vacuum treatment position so that the steel ladle and the buggy ladle can be jacked; a vacuum pump system is started for vacuum treatment; the vacuumized molten steel begins to cycle, light treatment is carried out at the early treatment stage, and the vacuum degree is maintained between 10 KPa and 20 KPa; shaking of a vacuum chamber tends to be normal at the rear circulation stage, the liquid level of the steel ladle is stable and steady, and the concentration of CO of tail gas is normal; after cleaning is conducted, vacuum refining is conducted on special types of steel. According to the method, the problems that oxygen content rises and steel is mingled with increasing oxide caused by the fact that oxygen content of the vacuum chamber is high are solved, purity of molten steel is promoted, and the phenomena of abnormal casting and scrapping of casting blanks due to poor purity of molten steel are reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a method for reducing high oxygen content in an RH vacuum chamber. Background technique [0002] In the field of metallurgy, due to RH vacuum treatment of aluminum-killed steel for a certain number of heats, it is inevitable that cold steel will accumulate in the vacuum chamber. When using it, it is necessary to blow oxygen in the vacuum chamber to melt the cold steel for discharge operation. After the discharge is completed, there will be some oxidized steel slag remaining in the vacuum chamber. When the molten steel is vacuum treated again, the discharge of the RH furnace and the oxidizing substances in the new vacuum chamber will affect the molten steel, which is mainly reflected in the large changes in the composition of the molten steel during the RH vacuum treatment, such as elements C, Si, Al and oxygen Elevation leads to phenomena such as foaming and blackening of refining slag, s...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems existing in the prior art, the object of the present invention is to provide a method for reducing the high oxygen content in the RH vacuum chamber, which can solve the problem of rising oxygen content and increased oxide inclusions in steel due to the high oxygen content in the vacuum chamber of RH vacuum refining Problems, improve the purity of molten steel for special steel, especially aluminum-killed steel, reduce aluminum loss during the treatment process, and reduce the phenomenon of casting abnormal billets scrapped due to poor purity of molten steel

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