RH efficient deep decarburization control method based on plasma jet

A technology of plasma and control method, which is applied in the field of RH high-efficiency deep decarburization control of plasma spraying, which can solve the problems of deoxidized alloy consumption, easy peroxidation of molten steel, and low utilization rate, so as to shorten the refining rhythm and reduce inclusions , the effect of improving the utilization rate

Active Publication Date: 2020-07-10
UNIV OF SCI & TECH BEIJING
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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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  • RH efficient deep decarburization control method based on plasma jet

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Embodiment 1

[0027] Embodiment 1: The present invention is applied in the 210tRH refining process, the lifting gas is Ar, and the deoxidation alloy adopts aluminum particles. Specific steps are as follows:

[0028] 1) When the RH ladle enters the station, the composition and temperature of the molten steel are measured and the conditions of the molten steel are uploaded to the control system, and the lifting gas of 120Nm is turned on at the same time 3 / h, turn on the mechanical pump to vacuum; initial carbon content [%C] 0 =300×10 -6 .

[0029] 2) Efficient decarburization period: the control system is based on the initial carbon content of molten steel [%C] 0 , efficient decarburization time t 1 , O 2 Utilization μ 1 and other data information to calculate and use the top blowing gas control valve group to online control the top blowing O 2 The flow is Q 1 , spray O to the molten steel surface in the vacuum chamber through the top-blown gas plasma spray gun 2 Plasma, while turni...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/068C21C7/06
CPCC21C7/06C21C7/068C21C7/10
Inventor 魏光升韩宝臣朱荣董建锋董凯冯超武文合姜娟娟
Owner UNIV OF SCI & TECH BEIJING
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