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A method for rh deep decarburization of molten steel

A deep decarburization and molten steel technology, applied in the field of metallurgy, can solve the problems of increasing metal Al/Si consumption, unfavorable conditions, and reducing production costs, and achieve the effect of shortening smelting time and reducing costs

Active Publication Date: 2021-06-22
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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  • A method for rh deep decarburization of molten steel
  • A method for rh deep decarburization of molten steel
  • A method for rh deep decarburization of molten steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The molten steel to be treated meets the following requirements: carbon content 0.035wt%-0.045wt%, oxygen content 0.025wt%-0.040wt%, temperature 1650-1710°C.

[0039] When the ladle is placed in the RH treatment station, insert the dipping tube 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 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. When the pressure in the vacuum degassing tank is less than 300Pa, switch to Ar gas drive, and the...

Embodiment 2

[0041] The molten steel to be treated meets the following requirements: carbon content 0.035wt%-0.045wt%, oxygen content 0.025wt%-0.040wt%, temperature 1650-1710°C.

[0042] When the ladle is placed in the RH treatment station, insert the dipping tube 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 50wt%, and the gas supply strength is 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. When the pressure in the vacuum degassing tank is less than 300Pa, switch to Ar ...

Embodiment 3

[0044]The molten steel to be treated meets the following requirements: carbon content 0.035wt%-0.045wt%, oxygen content 0.025wt%-0.040wt%, temperature 1650-1710°C.

[0045] When the ladle is placed in the RH treatment station, insert the dipping tube 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 50wt%, and the gas supply strength is 1.2Nm 3 / h·t, using CO at high temperature 2 The gas is weakly oxidizing and reacts: [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. When the pressure in the vacuum degassing tank is less than 300Pa, switc...

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Abstract

The invention discloses a method for RH deep decarburization of molten steel, comprising the following steps: a1) setting and supplying CO on the RH vacuum treatment equipment 2 ‑Argon blowing tube of Ar mixed gas; a2) Insert the RH vacuum treatment equipment into the ladle containing molten steel, turn on the vacuum pump to make the vacuum of the RH vacuum treatment equipment less than the first pressure, and start blowing CO 2 ‑Ar mixed gas makes the molten steel circulate; a3) When the vacuum pump makes the vacuum of the RH vacuum treatment equipment to be less than the second pressure, start to stop supplying CO 2 -Ar mixed gas and the argon blowing pipe starts to supply the first gas to circulate the molten steel; a4) When the vacuum pump makes the vacuum of the RH vacuum treatment equipment less than the third pressure, continue to supply the first gas for 4-6min. The RH deep decarburization method of molten steel of the present invention can realize the end point carbon content of 13-17ppm or 12-14ppm when the gas is injected into the anaerobic lance, and the smelting time is shortened by 2-3min.

Description

technical field [0001] The invention relates to the field of metallurgy, and more specifically, relates to a method for RH deep decarburization of molten steel. 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 clean...

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 李龙王建
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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