RH efficient deep decarburization control method based on plasma jet

Abstract

The invention belongs to the technical field of steelmaking, and particularly relates to an RH efficient deep decarburization control method based on plasma jet. The RH efficient deep decarburizationcontrol method is suitable for a 30-300 t RH steel ladle refining process. In the RH refining process, O2 and Ar plasmas are adopted to act on molten steel, and a traditional gas lifting and vacuum operation system is matched; a control system is combined with RH pull-in molten steel component data and a refining process monitoring system, a top-blown gas control valve set, a plasma spray gun anda vacuum chamber axial electrode are used for adjusting gas plasma arcs, and while rapid decarburization is achieved, the molten steel is ensured to be heated rapidly, molten steel peroxidation is avoided, the oxygen utilization rate is increased, deoxidation alloy consumption is reduced, the refining rhythm is accelerated, and the molten steel quality is improved. The O2 utilization rate is increased by 10-20%, the deoxidation alloy consumption is reduced by 3-10%, the RH refining period is shortened by 3-10 min, inclusions in steel are greatly reduced, and the molten steel quality is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking technology, in particular to a method for controlling RH high-efficiency deep decarburization based on plasma injection. Background technique [0002] With a plasma generator, a gas is heated to extremely high temperatures where it is transformed into a plasma by electricity. The gas plasma carries extremely high energy, and the energy loss of the plasma generator is very small. Both oxidizing and reducing gases can be heated efficiently without changing the gas composition. At present, plasma technology has been maturely applied in many fields, and in the field of metallurgy, low-temperature plasma technology can generally be used. [0003] The RH vacuum degassing method has developed from dehydrogenation treatment in the 1950s to a refining method with multiple metallurgical functions such as dehydrogenation, deoxidation, decarburization, desulfurization, and dephosphorization. At present,...

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Problems solved by technology

[0007] In view of the above problems, the present invention proposes a high-efficiency deep decarburization control method for RH based on plasma injection, which combines the advantages of plasma technology and RH refining to solve the problem of the existing RH refining process. 2 Technical problems such as low utilization rate, easy peroxidation of molten steel, and large consumption of deoxidized alloys

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