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A method to promote rh decarburization

A decarburization and carbon monoxide technology, applied in the field of metallurgy, can solve the problems of impact, equipment modification process, and difficult operation, etc., and achieve the effects of promoting bubble nucleation, increasing RH decarburization rate, and increasing nucleation depth

Active Publication Date: 2021-06-01
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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  • A method to promote rh decarburization

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The BOF-LF-RH-CC process is used to produce IF steel, and the capacity of the converter is 300t. The oxygen content at the end of the converter is 612×10 -6 , and then the ladle runs to the RH station, and the carbon mass concentration in the steel is measured to be 300×10 -6 . When this patented technology is not used, after RH vacuum decarburization for 15 minutes, the carbon mass concentration in the steel is measured 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 . Add aluminum particles to the steel during the tapping process, the addition amount is 210kg, the ladle is operated to the RH station, and the oxygen mass concentration in the steel before the RH vacuum treatment is measured to be 300×10 -6 , the carbon mass concentration is 300×10 -6 . RH refining starts, after evacuating for 2 minutes, the pressure in the vacuum tank drops to 8000Pa, and oxygen...

Embodiment 2

[0037] The BOF-LF-RH-CC process is used to produce IF steel, and the capacity of the converter is 120t. After the converter is tapped, the ladle runs to the RH station, and the dissolved oxygen content in the steel is measured 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 measured carbon concentration in the steel is 15×10 -6 .

[0038] When using this patented technology, aluminum particles are added to the steel before RH treatment, the addition amount is 44kg, and the dissolved oxygen content in the steel before adding aluminum particles is 485×10 -6 . Before the RH vacuum treatment, the oxygen mass concentration in the steel was determined to be 321×10 -6 , the carbon mass concentration is 250×10 -6 . RH refining starts, after evacuating for 2 minutes, the pressure in the vacuum tank drops to 7500Pa, and the top gun is used to blow oxygen into the molten s...

Embodiment 3

[0040] The BOF-LF-RH-CC process is used to produce DX56D+Z steel, and the capacity of the converter is 150t. After the steel is tapped, the ladle is moved to the RH station, and the dissolved oxygen content in the steel is measured 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 carbon mass concentration in the steel is measured to be 12×10 -6 .

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

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Abstract

A method to promote RH decarburization. Before or during the decarburization of ultra-low carbon steel RH, aluminum or aluminum alloy is added to the molten steel, and the aluminum-oxygen reaction is used to form dispersed Al in the molten steel. 2 o 3 Inclusions, generated Al 2 o 3 The inclusions have poor wettability and large wetting angle with molten steel, and become the heterogeneous nucleation core of carbon monoxide bubbles generated by RH decarburization reaction, which promotes the nucleation of carbon monoxide bubbles, increases the nucleation depth of carbon monoxide bubbles in molten steel, and expands The thickness of the reaction layer for the carbon-oxygen reaction in the RH vacuum tank improves the deep decarburization ability of the RH. The method can effectively increase the RH decarburization rate, and the carbon content at the end point is reduced by 1 to 10×10 ‑6 . The generated carbon monoxide bubbles are small in size and have a strong ability to capture inclusions, which can promote the formation of Al in advance. 2 o 3 Inclusions are removed without polluting molten steel.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular 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, processability and electromagnetic properties. With the rapid increase in the demand for ultra-low carbon steel and the strict control requirements for the carbon content at the end point of RH, 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 great influence on the decarburization rate, especially under low carbon conditions. According to the experimental and actual production results, reducing the vacuum degree and vacuum...

Claims

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Application Information

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Patent Type & Authority Patents(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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