Method for promoting RH decarburization

A decarburization and carbon monoxide technology, applied in the field of metallurgy, can solve the problems of influence, equipment modification, treatment process, and difficult operation, and achieve the effect of promoting aggregation and growth, improving RH decarburization rate, and good removal effect.

Active Publication Date: 2020-04-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the experimental and actual production results, reducing the vacuum degree and vacuuming speed, increasing the gas flow rate, increasing the oxygen content of the molten steel before RH treatment, and selecting the appropriate diameter of the dipping tube can increase the decarburization rate and reduce the carbon content at the end point. However, these methods require major changes to process parameters and equipment or have an impact on subsequent processing procedures, and the operation is difficult

Method used

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  • Method for promoting RH decarburization

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Experimental program
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Effect test

Embodiment 1

[0034] The BOF-LF-RH-CC process is adopted to produce IF steel with a converter capacity of 300t. The final oxygen content of the converter is 612×10 -6 , Then the ladle is moved to the RH station, and the carbon concentration in the steel is determined to be 300×10 -6 . When this patented technology is not used, after RH vacuum decarburization for 15 minutes, the mass concentration of carbon in the steel is determined to be 16×10 -6 .

[0035] When using this patented technology, the dissolved oxygen content in the steel before adding aluminum particles is 612×10 -6 . During the tapping process, aluminum particles are added to the steel, the addition amount is 210kg, the ladle is moved to the RH station, and the oxygen mass concentration in the steel before the RH vacuum treatment is determined to be 300×10 -6 , The carbon mass concentration is 300×10 -6 . RH refining starts, after vacuuming for 2 minutes, the pressure in the vacuum tank drops to 8000Pa, and the top gun is used...

Embodiment 2

[0037] The BOF-LF-RH-CC process is used to produce IF steel with a converter capacity of 120t. After the converter is tapped, the ladle is moved to the RH station, and the dissolved oxygen content in the steel is determined to be 485×10 -6 , The carbon mass concentration is 250×10 -6 . When this patented technology is not used, after RH vacuum decarburization for 10 minutes, the mass concentration of carbon in the steel is determined to be 15×10 -6 .

[0038] When this patented technology is used, aluminum particles are added to the steel before the RH treatment, the added amount is 44kg, and the dissolved oxygen content in the steel before the aluminum particles is 485×10 -6 . The mass concentration of oxygen in steel measured before RH vacuum treatment is 321×10 -6 , The carbon mass concentration is 250×10 -6 . RH refining starts, after vacuuming for 2 minutes, the pressure in the vacuum tank drops to 7500Pa, and the top gun is used to blow oxygen into the molten steel with a ...

Embodiment 3

[0040] The BOF-LF-RH-CC process is used to produce DX56D+Z steel with a converter capacity of 150t. After tapping, the ladle is moved to the RH station, and the dissolved oxygen content in the steel is determined to be 680×10 -6 , The carbon mass concentration is 400×10 -6 . When this patented technology is not used, after RH vacuum decarburization for 14 minutes, the mass concentration of carbon in the steel is determined to be 12×10 -6 .

[0041] When using this patented technology, aluminum particles are added to the steel in the early stage of the RH vacuum treatment, the addition amount is 54kg, and the dissolved oxygen content in the steel before the aluminum particles is 680×10 -6 . After adding aluminum particles, the oxygen mass concentration in steel is determined to be 520×10 -6 , The carbon mass concentration is 400×10 -6 . RH refining starts, after vacuuming for 2 minutes, the pressure in the vacuum tank drops to 8600Pa. A top gun is used to blow a large flow of oxy...

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Abstract

The invention discloses a method for promoting RH decarburization. Before or during RH decarburization of ultra-low carbon steel, aluminum or aluminum alloy is added into molten steel, an aluminum oxide reaction is used for forming dispersed Al2O3 inclusions in the molten steel, wettability of the generated Al2O3 inclusions and the molten steel is poor, the wetting angle is large, the Al2O3 inclusions become a heterogeneous nucleation core of carbon monoxide bubbles generated by an RH decarburization reaction, nucleation of the carbon monoxide bubbles is promoted, the nucleation depth of the carbon monoxide bubbles in the molten steel is increased, the thickness of a reaction layer of a carbon-oxygen reaction in an RH vacuum tank is increased, and the ability of RH deep decarburization isimproved. According to the method, the RH decarbonization rate can be effectively increased, the end point carbon content is reduced by (1-10)*10<-6>. The generated carbon monoxide bubbles have smallsizes and a strong ability to catch the inclusions, the removal of the previously generated Al2O3 inclusions can be promoted without polluting the molten steel.

Description

Technical field [0001] The invention belongs to the technical field of metallurgy, and specifically relates to a method for promoting RH decarburization. Background technique [0002] In recent years, ultra-low carbon steel has been widely used in electrical appliances, electronic equipment, automobiles, machinery and other manufacturing industries due to its excellent toughness, processing properties and electromagnetic properties. With the rapid growth of the demand for ultra-low carbon steel and the strict control requirements for the carbon content of the RH end point, it is of great significance to study the rapid and deep decarburization of RH. [0003] Many studies have shown that the diffusion rate of carbon and oxygen in molten steel and the nucleation of carbon monoxide bubbles have a greater impact on the decarburization rate, especially under low-carbon conditions. According to the experimental and actual production results, reducing the vacuum degree and vacuuming spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/068
CPCC21C7/068C21C7/10
Inventor 刘建华张杰何杨袁保辉雷铭宇闫柏军
Owner UNIV OF SCI & TECH BEIJING
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