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RH vacuum treatment device

A vacuum treatment and equipment technology, applied in the field of iron and steel metallurgy, can solve the problems of reducing production costs, increasing metal Al/Si consumption, unfavorable problems, etc., and achieves the effects of strong disturbance, longer action path, and longer contact time

Active Publication Date: 2020-03-17
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method increases the consumption of metal Al / Si, which is not conducive to reducing production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The molten steel to be treated meets the following requirements: carbon content 0.07wt%-0.09wt%, oxygen content 0.04wt%-0.050wt%, temperature 1650-1700°C.

[0044] When the ladle is placed in the RH processing station, insert the downcomer and the ascender into the molten steel in the ladle, and start the vacuum pump to pump air. When the pressure in the vacuum degassing tank is less than 17kPa, supply CO through the argon blowing tube 2 -Ar mixed gas is used as cycle gas and reaction medium, CO in the mixed gas 2 The content is 50%, the gas supply strength is 0.7Nm 3 / h·t, using CO at high temperature 2 Weak oxidation of gas, reaction: C+CO 2 = 2CO. On the one hand, direct decarbonization, CO 2 -Ar mixed gas reduces the partial pressure of CO to promote the reaction. On the other hand, twice as much CO is generated, and the circulation flow rate is increased to accelerate decarbonization. At the same time, the oxygen lance injects O 2 Gas, the gas supply streng...

Embodiment 2

[0046] The molten steel to be treated meets the following requirements: carbon content 0.07wt%-0.09wt%, oxygen content 0.04wt%-0.050wt%, temperature 1650-1700°C.

[0047] When the ladle is placed in the RH processing station, insert the downcomer and the ascender into the molten steel in the ladle, and start the vacuum pump to pump air. When the pressure in the vacuum degassing tank is less than 17kPa, supply CO through the argon blowing tube 2 -Ar mixed gas is used as cycle gas and reaction medium, CO in the mixed gas 2 Content 65wt%, air supply strength 1.2Nm 3 / h·t; using CO at high temperature 2 Weak oxidation of gas, reaction: C+CO 2 = 2CO. On the one hand, direct decarbonization, CO 2 -Ar mixed gas reduces the partial pressure of CO to promote the reaction. On the other hand, twice as much CO is generated, and the circulation flow rate is increased to accelerate decarbonization. At the same time, the oxygen lance injects O2 Gas, the gas supply strength is 12Nm 3 ...

Embodiment 3

[0049] The molten steel to be treated meets the following requirements: carbon content 0.07wt%-0.09wt%, oxygen content 0.04wt%-0.050wt%, temperature 1650-1700°C.

[0050] When the ladle is placed in the RH processing station, insert the downcomer and the ascender into the molten steel in the ladle, and start the vacuum pump to pump air. When the pressure in the vacuum degassing tank is less than 17kPa, supply CO through the argon blowing tube 2 -Ar mixed gas is used as cycle gas and reaction medium, CO in the mixed gas 2 Content 55wt%, air supply strength 1.0Nm 3 / h·t; using CO at high temperature 2 Weak oxidation of gas, reaction: C+CO 2 = 2CO. On the one hand, direct decarbonization, CO 2 -Ar mixed gas reduces the partial pressure of CO to promote the reaction. On the other hand, twice as much CO is generated, and the circulation flow rate is increased to accelerate decarbonization. At the same time, the oxygen lance injects O 2 Gas, the gas supply strength is 10Nm ...

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Abstract

The invention discloses an RH vacuum treatment device. The device comprises a steel ladle, a vacuum degassing tank, a bottom blowing pipe, an oxygen gun and an argon blowing pipe; the vacuum degassingtank comprises a tank body, a descending pipe and an ascending pipe, wherein the descending pipe and the ascending pipe communicate with the tank body; the bottom blowing pipe communicates with the bottom of the vacuum degassing tank; the oxygen gun is arranged at the top of the vacuum degassing tank; and the argon blowing pipe is arranged at the ascending pipe and communicates with the ascendingpipe, and the argon blowing pipe comprises a main pipe and a first branch pipe and a second branch pipe, wherein the first branch pipe and the second branch pipe form two paths at the tail end of themain pipe, and the first branch pipe and the second branch pipe communicate with the ascending pipe. According to the device, low-cost, fast and good-effect decarbonizing can be realized.

Description

technical field [0001] The present invention relates to the field of iron and steel metallurgy, and more specifically, relates to a RH vacuum treatment equipment. Background technique [0002] In recent years, the function of RH vacuum degassing equipment and RH and the range of refined steel types have been continuously expanded, and it has developed into a multi-functional vacuum refining technology, which plays a leading role in out-of-furnace refining. Most steel mills are equipped with RH refining equipment to realize high-efficiency and low-cost production of high-quality steel. [0003] As the market has lower and lower requirements for carbon content in steel, especially the carbon content of finished products is within 15ppm or even 10ppm. In order to meet this requirement, RH uses oxygen blowing to force decarburization, and it is necessary to extend the oxygen supply time to cause the oxygen activity of molten steel. On the high side, it is unfavorable to the cle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/072
CPCC21C7/072C21C7/10
Inventor 李龙王建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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