阅读说明：本技术 一种通过氧枪进行多气体喷吹的脱碳方法 (Decarburization method for carrying out multi-gas injection through oxygen lance ) 是由 李龙 王建 于 2019-10-30 设计创作，主要内容包括：本发明公开了一种通过氧枪进行多气体喷吹的脱碳方法,包括步骤：1)在RH真空处理设备上设置供应CO<Sub>2</Sub>-Ar混合气的吹氩管和氧枪；2)将RH真空处理设备插入装有钢水的钢水包,开启真空泵使得RH真空处理设备的真空抽至小于第一压力时,开始吹CO<Sub>2</Sub>-Ar混合气使得钢水循环；3)在吹CO<Sub>2</Sub>-Ar混合气的同时,使用氧枪喷吹第一气体至钢水中；4)真空泵使得RH真空处理设备的真空抽至小于第二压力时,开始停止供应CO<Sub>2</Sub>-Ar混合气且所述吹氩管开始供应第二气体使得钢水循环；5)真空泵使得RH真空处理设备的真空抽至小于第三压力时,继续供应第一气体和第二气体5-8min。本发明的通过氧枪进行多气体喷吹的脱碳方法在使用氧枪喷入气体时可以实现终点碳含量小于10ppm,冶炼时间缩短3-4min。(The invention discloses a decarburization method for carrying out multi-gas injection through an oxygen lance, which comprises the following steps: 1) CO supply is arranged on RH vacuum treatment equipment 2 -an argon blowing pipe and an oxygen lance for an Ar gas mixture; 2) inserting RH vacuum treatment equipment into a ladle filled with molten steel, starting a vacuum pump to ensure that the vacuum of the RH vacuum treatment equipment is pumped to be less than a first pressure, and starting blowing CO 2 -Ar gas mixture circulating molten steel; 3) blowing CO 2 Blowing a first gas into the molten steel by using an oxygen lance while using the Ar mixed gas; 4) the vacuum pump makes the RH vacuum processing equipment vacuumized to be less than the second pressure, and then the CO supply is stopped 2 -Ar mixed gas and the argon blowing tube starts supplying a second gas so that molten steel circulates; 5) and when the vacuum of the RH vacuum processing equipment is pumped to be lower than the third pressure by the vacuum pump, continuously supplying the first gas and the second gas for 5-8 min. The decarburization method using an oxygen lance for multiple gas injection of the present invention is carried out using an oxygen lanceWhen gas is sprayed, the end point carbon content is less than 10ppm, and the smelting time is shortened by 3-4 min.)

1. A decarburization method using an oxygen lance for multiple gas injection, which is characterized by comprising the following steps:

1) CO supply is arranged on RH vacuum treatment equipment₂-an argon blowing pipe and an oxygen lance for an Ar gas mixture;

2) inserting RH vacuum treatment equipment into a ladle filled with molten steel, starting a vacuum pump to ensure that the vacuum of the RH vacuum treatment equipment is pumped to be less than a first pressure, and starting blowing CO₂-Ar gas mixture circulating molten steel;

3) blowing CO₂Blowing a first gas into the molten steel by using an oxygen lance while using the Ar mixed gas;

4) the vacuum pump makes the RH vacuum processing equipment vacuumized to be less than the second pressure, and then the CO supply is stopped₂-Ar mixed gas and the argon blowing tube starts supplying a second gas so that molten steel circulates;

5) and when the vacuum of the RH vacuum processing equipment is pumped to be lower than the third pressure by the vacuum pump, continuously supplying the first gas and the second gas for 5-8 min.

2. The decarburization method using multiple gas injection through an oxygen lance as claimed in claim 1, wherein the molten steel to be treated has a carbon content of 0.06 wt.% to 0.08 wt.%, an oxygen content of 0.04 wt.% to 0.050 wt.%, and a temperature of 1650-1700 ℃.

3. The decarburization method using multiple gas injection via an oxygen lance as recited in claim 1, wherein CO is introduced into the furnace through the oxygen lance₂CO in-Ar gas mixture₂50-65 wt% of CO₂The flow rate of the-Ar mixture is 0.7-1.2Nm³/h·t。

4. The method of decarbonization by multi-gas injection through an oxygen lance of claim 1 wherein the first gas is CO₂-O₂And (4) mixing the gases.

5. The decarburization method using multiple gas injection through an oxygen lance as recited in claim 4, wherein CO is introduced into the oxygen lance₂-O₂CO in mixed gas₂15 to 25 weight percent of CO₂-O₂The air supply intensity of the mixed gas is 8-12 Nm³/h·t。

6. The decarburization method using multiple gas injection via an oxygen lance as claimed in claim 1, wherein the first gas is O₂。

7. The decarburization method using multiple gas injection via an oxygen lance as recited in claim 6, wherein O is introduced into the oxygen lance₂The air supply intensity of (1) is 8-12 Nm³/h·t。

8. The decarburization method using multiple gas injection via an oxygen lance as claimed in claim 1, wherein the second gas is Ar-H₂And (4) mixing the gases.

9. The process of claim 8A decarburization method using an oxygen lance with multiple gas blasts, characterized in that Ar-H₂H in the mixed gas₂55 to 70 weight percent of Ar-H₂The flow rate of the mixed gas is 0.7-1.2Nm³/h·t。

10. The decarburization method using multiple gas injection via an oxygen lance as claimed in claim 1, wherein the second gas is Ar gas.

Technical Field

The present invention relates to the field of metallurgy, and more particularly, to a decarburization method with multiple gas injection through an oxygen lance.

Background

In recent years, RH vacuum degassing equipment, and RH functions and steel types for refining have been expanded, and a multifunctional vacuum refining technology has been developed, and has been dominant in external refining. Most steel mills are provided with RH refining equipment, so that the high-efficiency and low-cost production of high-quality steel is realized.

Along with the requirement of the market on the carbon content of various steels, particularly the carbon content of finished products is within 15ppm or even 10ppm, in order to meet the requirement, RH adopts oxygen blowing to perform forced decarburization, the oxygen supply time needs to be prolonged, so that the oxygen activity of molten steel is higher, and the cleanliness of the molten steel is not favorable.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a decarburization method for carrying out multi-gas injection through an oxygen lance.

Based on the purpose, the following technical scheme is adopted:

according to the present invention, there is provided a decarburization method using an oxygen lance for multiple gas injection, comprising the steps of:

1) CO supply is arranged on RH vacuum treatment equipment₂-an argon blowing pipe and an oxygen lance for an Ar gas mixture;

2) inserting RH vacuum treatment equipment into a ladle filled with molten steel, starting a vacuum pump to ensure that the vacuum of the RH vacuum treatment equipment is pumped to be less than a first pressure, and starting blowing CO₂-Ar gas mixture circulating molten steel;

3) blowing CO₂Blowing a first gas into the molten steel by using an oxygen lance while using the Ar mixed gas;

4) the vacuum pump makes the RH vacuum processing equipment vacuumized to be less than the second pressure, and then the CO supply is stopped₂Ar mixed gas and the argon blowing pipe starts to supply second gas to circulate the molten steel, and the oxygen lance still supplies the first gas;

5) and when the vacuum of the RH vacuum processing equipment is pumped to be lower than the third pressure by the vacuum pump, continuously supplying the second gas and the first gas for 5-8 min.

Further, the carbon content of the molten steel to be treated is 0.06-0.08 wt%, the oxygen content is 0.04-0.050 wt%, and the temperature is 1650-1700 ℃.

Further, CO₂CO in-Ar gas mixture₂50-65 wt% of CO₂The flow rate of the-Ar mixture is 0.7-1.2Nm³/h·t。

Further, the first gas is CO₂-O₂And (4) mixing the gases.

Further, CO₂-O₂CO in mixed gas₂15 to 25 weight percent of CO₂-O₂The air supply intensity of the mixed gas is 8-12 Nm³/h·t。

Further, the first gas is O₂。

Further, O₂The air supply intensity of (1) is 8-12 Nm³/h·t。

Further, the second gas is Ar-H₂And (4) mixing the gases.

Further, Ar-H₂H in the mixed gas₂55 to 70 weight percent of Ar-H₂The flow rate of the mixed gas is 0.7-1.2Nm³/h·t。

Further, the second gas is Ar gas.

Further, the first pressure was 17 kPa.

Further, the second pressure is 300 Pa.

Further, the second pressure is 100 Pa.

The invention has the beneficial effects that:

the decarburization method for multi-gas injection through the oxygen lance can realize that the end point carbon content is less than 10ppm and the smelting time is shortened by 3-4min when the oxygen lance is used for injecting gas.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some implementation examples of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a schematic view of an RH vacuum processing apparatus according to embodiments 1 to 4 of the present invention;

FIG. 2 is a schematic view of an argon blowing tube according to an embodiment of the present invention;

FIG. 3 is a schematic view of the projection of the argon blowing tube and the rising pipe to the horizontal plane according to the embodiment of the present invention.

List of reference numerals

1-steel ladle 2-vacuum degassing tank 3-tank body 4-downcomer 5-riser 7-oxygen lance 8-argon blowing pipe 81-main pipe 82-first branch pipe 83-second branch pipe

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.