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Process for applying hydrogen to deoxygenation of liquid steel

A liquid steel and process technology, applied in the field of molten steel deoxidation process, can solve the problem that the pollution of deoxidation products cannot be completely avoided, so as to improve the cleanliness of molten steel and the quality of steel, reduce the pollution of molten steel, and reduce the effect of obstruction

Inactive Publication Date: 2009-12-16
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a variety of technological measures have been taken to remove inclusions, the pollution of molten steel by deoxidation products cannot be completely avoided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A process in which hydrogen is used to deoxidize molten steel. Low-carbon steel is produced in a 200t converter, and H 2 Blowing into molten steel for deoxidation, blowing into molten steel for deoxidation is to blow H 2 Deoxidation is carried out by blowing air bricks into molten steel from the bottom of the top-bottom combined blowing converter. h 2 The flow rate is 300~1800m 3 / h, the pressure is 0.5~1.5MPa, and the time for blowing into molten steel is 10~30min.

[0014] At the end of hydrogen blowing and deoxygenation in the converter, the hydrogen dissolved in the steel is removed by blowing argon and vacuum treatment.

Embodiment 2

[0016] A process in which hydrogen is used to deoxidize molten steel. Low-carbon steel is produced in a 300t converter, and Ar-H 2 The mixed gas is blown into molten steel for deoxidation, Ar-H 2 The mixed gas flow rate is 800~3000m 3 / h, the pressure is 0.5~1.0MPa, and the time for blowing the mixed gas into the molten steel is 5~20min.

[0017] At the end of hydrogen blowing and deoxygenation in the converter, the hydrogen dissolved in the steel is removed by blowing argon and vacuum treatment.

[0018] In this embodiment: blowing into the molten steel for deoxidation is to use Ar-H 2 The mixed gas is blown into the molten steel from the bottom of the top-bottom combined blowing converter through the breathable brick for deoxidation; in the Ar-H 2 In the mixed gas, the volume content of Ar is 10-50%, H 2 The volume content is 50-90%.

Embodiment 3

[0020] A process in which hydrogen is used to deoxidize molten steel. In the production of aluminum killed steel, H 2 Blowing into unalloyed molten steel for deoxidation, blowing into molten steel for deoxidation is to blow H 2 Blow into molten steel through the breathable brick at the bottom for deoxidation. h 2 The flow rate is 40~200m 3 / h, the pressure is 0.5~1.5MPa, H 2 The time for blowing into molten steel is 10-30 minutes. At the end of hydrogen blowing and deoxidation of the ladle, the hydrogen dissolved in the steel is removed by argon blowing and vacuum treatment.

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PUM

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Abstract

The invention relates to a process for applying hydrogen to deoxygenation of liquid steel. The invention adopts the technical scheme that: when the oxygen blowing decarbonization in a converter comes to an end, or when steel ladle is refined or when the oxygen blowing decarbonization for RH ultra-low-carbon steel production comes to an end, the mixed gas of H2 or Ar-H2 is blown into liquid steel for deoxygenation, the flowrate of the mixed gas ranges from 40 to 3000m3 / h, the pressure ranges from 0.5 to 2.0 MPa, and the time of blowing the mixed gas into the liquid steel ranges from 5 to 30min. When converter or steel ladle or RH hydrogen blowing deoxygenation comes to an end, hydrogen which is dissolved in the steel is removed by argon blowing and vacuum treatment, wherein the step of blowing the gas into the liquid steel for deoxygenation is that the gas is blown into the liquid steel for deoxygenation by a gas permeable brick from the bottom of a top-bottom combined blown converter or from the bottom of the steel ladle or from an RH ascending tube; and in the mixed gas of Ar-H2, the volume content of Ar ranges from 10 to 80 percent, and the volume content of H2 ranges from 20 to 90 percent. The invention has the advantages that the process is simple, and the pollution of the liquid steel caused by deoxygenation can be reduced. The process used for removing oxygen in the steel can effectively increase the cleaness of the liquid steel and the quality of steel products.

Description

technical field [0001] The invention belongs to the technical field of molten steel deoxidation. In particular, it relates to a process of using hydrogen for deoxidizing molten steel. Background technique [0002] In steelmaking production, oxygen and its existing forms in steel have a great influence on the properties of steel. With the progress of society and the development of science and technology, the performance requirements of steel are increasing day by day. How to reduce the oxygen content in molten steel and improve the cleanliness of steel is more and more concerned by metallurgists. [0003] The traditional deoxidation method mainly uses a deoxidizer to directly deoxidize. The disadvantage of this deoxidation method is that the deoxidation product remains in the molten steel and causes pollution to the molten steel. The inclusions in the molten steel, especially the oxide inclusions generated by deoxidation, directly affect the quality of the steel. Althoug...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
Inventor 倪红卫幸伟张华何环宇
Owner WUHAN UNIV OF SCI & TECH
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