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Flexible pre-oxidizing device and method for continuous hot galvanizing line

A pre-oxidation and hot-dip galvanizing technology, which is applied in hot-dip coating process, heat treatment furnace, heat treatment equipment, etc., can solve the problems of poor pre-oxidation precision, affecting the atmosphere composition in the furnace, and inaccurate oxidation control, so as to improve production flexibility , The oxidation process of the steel strip is uniform, and the effect of realizing the opening and closing function of pre-oxidation

Active Publication Date: 2014-06-11
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the actual galvanizing line is heated, the soaking section is connected, and the range of the furnace area involved in the dew point adjustment is too large, resulting in inaccurate oxidation control, and the reduction can only be achieved by the slow cooling section
Some use the method of injecting nitrogen and air mixture to realize pre-oxidation, but this method causes gas diffusion and affects the composition of the atmosphere in the furnace, and its actual control accuracy of pre-oxidation is poor

Method used

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  • Flexible pre-oxidizing device and method for continuous hot galvanizing line

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Experimental program
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Effect test

Embodiment 1

[0046] No pre-oxidation mode: the steel strip to be treated is sent to the continuous annealing furnace 1, the pre-oxidation chamber 7 is connected to the external furnace area through the gas communication device 8, and the gas in the oxidizing atmosphere is not introduced, the steel strip is preheated, and the first heating section 3 After heating, it enters the pre-oxidation cabin 7 without going through the pre-oxidation process, then enters the second heating section 4 for heating, and then performs soaking. For mild steel with low alloy content, this mode is consistent with the traditional continuous annealing furnace without pre-oxidation chamber 7.

Embodiment 2

[0048] Weak oxidation mode: the gas communication device 8 between the pre-oxidation cabin 7 and the external furnace area is closed, and a nitrogen-oxygen mixture with a certain oxygen content or humidified medium dew point nitrogen is introduced into the pre-oxidation cabin 7 to control the weak oxidation in the pre-oxidation cabin 7 environment of. The steel strip to be treated is sent into the continuous annealing furnace 1, the steel strip is preheated and heated in the first heating section 3, then enters the pre-oxidation chamber 7 for pre-oxidation process, then enters the second heating section 4 for heating, and then performs soaking. For high-strength steel with medium Si and Mn content, because the partial pressure of oxygen in the furnace increases, the speed of oxygen diffusion into the strip steel increases, which is greater than the speed of diffusion of Si and Mn to the surface of the strip steel, so the formed Si , Mn oxides are not gathered on the strip surf...

Embodiment 3

[0050]Strong oxidation mode: the gas communication device 8 between the pre-oxidation chamber 7 and the external furnace area is closed, and the nitrogen-oxygen mixed gas with high oxygen content or humidified high dew point nitrogen is introduced into the pre-oxidation chamber 7 . The steel strip to be treated is sent into the continuous annealing furnace 1, the steel strip is preheated and heated in the first heating section 3, then enters the pre-oxidation chamber 7 for pre-oxidation process, then enters the second heating section 4 for heating, and then performs soaking. In the case of a strong oxidizing atmosphere, Si and Mn in the strip form oxides, and iron on the surface of the strip also forms an oxide film. After exiting the pre-oxidation cabin 7, the reduction of iron is realized in the nitrogen-hydrogen reducing atmosphere of the second heating section 4 and the soaking section 5. During the galvanizing process, the zinc and the reduced iron film are combined to for...

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Abstract

The invention relates to a flexible pre-oxidizing device and method for a continuous hot galvanizing line. The device comprises a continuous annealing furnace, a pre-oxidizing cabin, a gas connector and a sealing roller. By adopting the device, pre-oxidization opening and closing functions can be realized, internal and external oxidation of the surface of band steel can be controlled accurately, and uniform oxidation of the surface of the band steel can be ensured. The flexible pre-oxidizing method for the continuous hot galvanizing line is implemented through the device. By adjusting the gas composition in the pre-oxidizing cabin, collinear production of high-strength steel and soft steel can be met, and the flexibility of the continuous hot galvanizing line is improved.

Description

technical field [0001] The invention relates to the technical field of continuous hot-dip galvanizing for strip steel, in particular to a flexible pre-oxidation device and method for a continuous hot-dip galvanizing line. Background technique [0002] Because high-strength steel contains more alloying elements, such as Si, Mn, etc., it is easy to form outer oxides during the annealing process, so that the zinc liquid cannot infiltrate the steel plate, and eventually lead to missing plating defects. At present, the widely used method is to increase the oxygen partial pressure of the annealing furnace so that oxygen diffuses into the steel plate to form internal oxidation of Si, Mn, etc. to improve the surface quality of hot-dip galvanized high-strength steel. [0003] For specific implementation, some use the direct combustion method in the heating section to improve the surface quality of the strip steel. However, it is difficult to accurately control the oxidation degree an...

Claims

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Application Information

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IPC IPC(8): C23C2/02C21D1/76C21D9/56
Inventor 邝霜韩赟姜英花刘华赛齐秀美朱国森王勇围王海全尉冬刘广会滕华湘
Owner SHOUGANG CORPORATION