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Process for hydrogen blowing deoxidation of molten steel

A technology of liquid steel and process, which is applied in the process field of hydrogen blowing and deoxidation of molten steel, which can solve the problems of molten steel pollution and achieve the effect of avoiding pollution

Inactive Publication Date: 2022-02-18
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This application provides a process for deoxidizing molten steel by blowing hydrogen to solve the technical problem of contamination of molten steel by inclusions caused by traditional deoxidizers

Method used

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  • Process for hydrogen blowing deoxidation of molten steel

Examples

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Effect test

Embodiment 1

[0049]200 tons of converter smelting Q345B steel, the mass fraction of carbon in molten steel at the end of smelting is 0.09%, after the converter is tapped to the ladle, hydrogen gas is blown into the bottom blower for a total of 20 minutes, and the hydrogen gas intensity is 226NL / min / T . After the deoxidation is completed, the dissolved oxygen content of molten steel is 15ppm.

Embodiment 2

[0051] P20 steel is smelted in a 200-ton converter, and the mass fraction of carbon at the end of the smelting process is 0.2%. After the converter is tapped to the ladle, hydrogen is blown into the bottom blower for a total of 15 minutes, and the hydrogen blowing intensity is 78.6NL / min / T. After the deoxidation is completed, the dissolved oxygen content of molten steel is 13ppm.

Embodiment 3

[0053] A 200-ton converter smelts M3A31 steel. The mass fraction of carbon at the smelting end point is 0.02%. After the converter is tapped to the ladle, hydrogen is blown into the bottom blower for a total of 30 minutes. The hydrogen blowing intensity is 783NL / min / T. After the deoxidation is completed, the dissolved oxygen content of molten steel is 19ppm.

[0054] In this application, the molten steel that has been deoxidized by bottom blowing hydrogen is subjected to subsequent processes, which avoids the contamination of the molten steel by inclusions in the traditional deoxidizer, achieves the purpose of deoxidation, and makes the molten steel ultra-purified.

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Abstract

The invention relates to the technical field of steelmaking, in particular to a process for hydrogen blowing deoxidation of molten steel. Molten steel obtained after converter steelmaking is finished is transferred to a steel ladle; the molten steel in the steel ladle is subjected to bottom blowing through hydrogen so that the oxygen content of the molten steel can be reduced, and according to the technological parameters of bottom blowing, if the carbon content of the molten steel ranges from 0.01% to 0.04% by mass, the strength of the hydrogen ranges from 500 NL / min / T to 1000 NL / min / T, and the bottom blowing time ranges from 10 min to 50 min; if the carbon content of the molten steel is 0.041%-0.1% by mass, the strength of the hydrogen ranges from 200 NL / min / T to 499 NL / min / T, and the bottom blowing time ranges from 10 min to 50 min; if the carbon content of the molten steel is larger than 0.1% by mass, the strength of the hydrogen ranges from 30 NL / min / T to 199 NL / min / T, and the bottom blowing time ranges from 10 min to 50 min. According to the process, the content of dissolved oxygen in the steel is reduced to 20 ppm or below, and the molten steel subjected to deoxidization treatment is subjected to a subsequent process, so that pollution of inclusions to the molten steel can be effectively avoided, the purpose of deoxidization is achieved, and meanwhile, the molten steel is subjected to ultra-purification.

Description

technical field [0001] The present application relates to the technical field of steelmaking, in particular to a process for blowing hydrogen and deoxidizing molten steel. Background technique [0002] In the process of steelmaking, deoxidizers such as Al and Si are usually used to deoxidize the molten steel. The biggest disadvantage of this method is that both the deoxidizer and the deoxidized products are mixed in the molten steel, thus causing pollution to the molten steel; the molten steel cannot Complete removal of non-metallic inclusions produced, negatively impacting final steel quality. In the refining process, various measures are taken to reduce the content of oxygen and oxidation products in steel, and the pollution of molten steel by inclusions cannot be completely avoided. [0003] Hydrogen is a colorless gas with a lower density than air, with a melting point of -259.14°C and a boiling point of -252.8°C. Hydrogen can react with many non-metal elements or meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
CPCC21C7/06
Inventor 刘洋吕延春王海宝朱志远赵晶王臻明马长文李海波王玉龙刘柏松郝宁胡显堂蒯多圣谢翠红刘国梁
Owner SHOUGANG CORPORATION
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