A rh refining method for reducing the temperature drop of molten steel and cooling steel in a vacuum chamber

A vacuum chamber and cold steel technology, applied in the field of iron and steel metallurgy, can solve the problems of large temperature drop of molten steel, carburization of molten steel, large volume, etc., to reduce the temperature drop of molten steel, increase the temperature of refractory materials, and increase the decarburization rate Effect

Active Publication Date: 2021-10-26
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The RH vacuum refining process equipment has also made great progress. In order to realize the high efficiency of RH refining and reduce the RH vacuum refining cycle, measures such as forced decarburization, increased pumping capacity, increased circulation flow rate, and increased dip tube diameter were adopted. , but with the acceleration of the decarburization rate, the splashing of molten steel in the vacuum chamber is becoming more and more serious, and the molten steel droplets splash onto the inner wall of the vacuum chamber. Due to the lower temperature of the inner wall of the vacuum chamber, the molten steel droplets are easily condensed on On the inner wall of the vacuum chamber, the cold steel is easily oxidized, and falls off into the molten steel, causing the molten steel to increase carbon and oxygen
At the same time, due to the large volume of the vacuum chamber and fast heat dissipation, the temperature drop of the molten steel is large

Method used

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  • A rh refining method for reducing the temperature drop of molten steel and cooling steel in a vacuum chamber
  • A rh refining method for reducing the temperature drop of molten steel and cooling steel in a vacuum chamber
  • A rh refining method for reducing the temperature drop of molten steel and cooling steel in a vacuum chamber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The carbon content of the steel product smelted in this embodiment is ≤0.003%, the converter adopts a low-temperature tapping process, the tapping temperature is 1649°C, and the tapping amount is 218t;

[0070] After the ladle enters the station, the temperature at the station is 1602°C, the carbon at the station is 0.03%, the oxygen at the station is 376ppm, and the carbon content at the end of RH is 0.0015%. Forced decarburization is used for decarburization by blowing oxygen. According to the formula, the amount of oxygen blowing is 68m 3 During the forced decarburization period, the position of the top gun is dynamically controlled from 7.5-6.5-5.5-4.5m from high to low. The oxygen blowing volume of each gun position is 17m 3 , the circulating argon flow control is less than 2200NL / min;

[0071] After the forced decarburization and oxygen blowing, the lowest gun position of 4.5m remains unchanged, and oxygen and gas are injected for combustion. The gas medium is cok...

Embodiment 2

[0075] The carbon content of the steel product smelted in this embodiment is ≤0.003%, the converter adopts a low-temperature tapping process, the tapping temperature is 1641°C, and the tapping amount is 221t;

[0076] After the ladle enters the station, the temperature at the station is 1594°C, the carbon at the station is 0.033%, the oxygen at the station is 289ppm, and the carbon content at the end of RH is 0.0015%. Forced decarburization and oxygen blowing are used for decarburization. According to the formula, the amount of oxygen blowing is 76m 3 During the forced decarburization period, the position of the top gun is dynamically controlled from 7.5-6.5-5.5-4.5m from high to low, and the oxygen blowing volume of each gun position is 19m 3 , the circulating argon flow control is less than 2200NL / min;

[0077] After the forced decarburization and oxygen blowing, the lowest gun position of 4.5m remains unchanged, and oxygen and gas are injected for combustion. The gas medium...

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Abstract

The invention discloses an RH refining method for reducing the temperature drop of molten steel and cooling steel in a vacuum chamber, belonging to the technical field of steelmaking. The method includes: obtaining decarburized molten steel; according to the arrival temperature and oxygen content of the obtained decarburized molten steel, it is determined to use a complete combustion process or a peroxygen combustion process to deoxidize the decarburized molten steel: if the decarburized molten steel is used In the oxy-combustion process, the relationship between the amount of additional oxygen blowing required in the peroxy-combustion process and the compensation temperature is shown in formula (1) in the present invention. Using the above method, the temperature drop of molten steel from RH entering the station to exiting the station can be controlled to 10-0°C, and the amount of cold steel in the vacuum chamber can be reduced by 30-60%.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an RH refining method for reducing the temperature drop of molten steel and cooling steel in a vacuum chamber. Background technique [0002] With the development of steel refining technology, the RH vacuum refining process has become the most important means of smelting ultra-low carbon automotive steel. The RH vacuum refining process equipment has also made great progress. In order to realize the high efficiency of RH refining and reduce the RH vacuum refining cycle, measures such as forced decarburization, increased pumping capacity, increased circulation flow rate, and increased dip tube diameter were adopted. , but with the acceleration of the decarburization rate, the splashing of molten steel in the vacuum chamber is becoming more and more serious, and the molten steel droplets splash onto the inner wall of the vacuum chamber. Due to the lower temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/10C21C7/068C21C7/06
CPCC21C7/06C21C7/068C21C7/10
Inventor 马文俊刘道正陈斌龚坚黄福祥李海波高攀陈建光赵彦伟刘国梁
Owner SHOUGANG CORPORATION
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