CN115213364A - Method for improving nodulation of continuous casting functional refractory material by using vacuum technology - Google Patents
Method for improving nodulation of continuous casting functional refractory material by using vacuum technology Download PDFInfo
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- CN115213364A CN115213364A CN202210876372.5A CN202210876372A CN115213364A CN 115213364 A CN115213364 A CN 115213364A CN 202210876372 A CN202210876372 A CN 202210876372A CN 115213364 A CN115213364 A CN 115213364A
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- stopper rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/113—Treating the molten metal by vacuum treating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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Abstract
The invention belongs to the technical field of refractory materials for continuous casting, and relates to a method for improving nodulation of a continuous casting functional refractory material by using a vacuum technology, in particular to a method for improving nodulation of an integral stopper rod and a submerged nozzle. The method for improving the nodulation of the continuous casting functional refractory material by using the vacuum technology is characterized in that air chambers are arranged in an inner hole of an integral stopper rod and an immersion type water gap; the method is characterized in that: the method comprises the steps of firstly, calculating the pressure of a flow control area between an integral stopper rod head and a wrist part of an immersion nozzle and the pressure of an inner hole area of the immersion nozzle, and taking the minimum pressure as Pmin; then communicating the air chamber with a vacuum pump through a corresponding air connecting hole; when the molten steel is continuously cast, the vacuum pump is started, a certain vacuum is formed in the air chamber and is lower than the minimum pressure Pmin, the suction force formed by the vacuum is utilized to counteract the negative pressure of the flow control area and the inner hole, the diffusion of CO and SiO gas into the molten steel is reduced, and the generation of alumina is reduced so as to achieve the purpose of avoiding alumina blockage.
Description
Technical Field
The invention belongs to the technical field of refractory materials for continuous casting, and relates to a method for improving nodulation of a refractory material with a continuous casting function by using a vacuum technology, in particular to a method for improving nodulation of an integral stopper rod and a submerged nozzle.
Background
The high-efficiency continuous casting is one of key technologies for realizing high-quality steel production, the integral stopper rod and the submerged nozzle are important functional refractory materials for realizing the high-efficiency continuous casting, play important roles in controlling molten steel flow rate, flow field and the like, and the safety, stability, service life and synchronism of the continuous casting and the submerged nozzle play a decisive role in improving the continuous casting efficiency, the billet quality and the continuous cooperation of steel flow. The integral stopper is one of the most important control elements in the continuous casting production process, is arranged in a tundish and is matched with an internally-installed submerged nozzle or a tundish upper nozzle, and controls the flow of molten steel from the tundish to a crystallizer in the continuous casting process so as to ensure the stability of the liquid level of the molten steel in the crystallizer and the stability of the continuous casting process; due to the non-replaceability of the stopper rod in the using process, once the stopper rod has a problem, the steel loss is controlled and even the pouring is stopped, so that the continuous casting is interrupted, and serious safety accidents or huge economic losses are caused; the submerged nozzle is one of the most key refractory functional components in the continuous casting process, is an important component for connecting a tundish and a crystallizer in the molten steel pouring process, and has important functions of preventing the molten steel from being secondarily oxidized, avoiding slag entrapment of the crystallizer, improving the flow field distribution of the crystallizer and the like; therefore, a nozzle with high service reliability and long service life is an important guarantee for realizing efficient continuous casting.
However, in the continuous casting process of high-quality steel such as low-carbon aluminum killed steel, ti-containing steel, rare earth steel and other alloy steel, the nodulation of the stopper rod and the nozzle has become relative to the thermal shock resistance and the erosion resistance of the materialThe common failure problem in the service process is solved; the nodulation of the integral stopper rod and the submersed nozzle easily causes the reduction of the pulling speed or the non-uniform flow field, so that the continuous casting operation is unstable, the nodulation falling, the slag entrapment and the like seriously affect the quality of a casting blank, and even cause the continuous casting process to have no flow suddenly and the nozzle to be completely blocked to cause continuous casting interruption accidents; the nodulation of the whole stopper rod mainly occurs at the rod head position; the submerged nozzle nodulation mainly occurs in the wrist, the inner hole and the steel outlet. The nodules are mainly deoxidized products, solidified steel, complex oxide agglomerates and the like, wherein Al is a typical inclusion 2 O 3 . Based on the influence rule of factors such as hydrodynamics and chemistry on the material and structure of the refractory material and the transmission and adhesion of foreign particles, various technical means are developed from different viewpoints, angles and methods by optimizing process conditions, compounding an anti-blocking material on the inner wall, innovating a submerged nozzle structure, applying a physical field and the like, and although the problem of the nodulation of the nozzle is solved to a certain extent, the problem of poor applicability and the like is also very outstanding.
Research shows that complex chemical reaction (carbothermic reduction reaction) can occur between the integral stopper rod and the refractory material of the submerged nozzle and molten steel during high-temperature service to generate gases such as CO, siO and the like. However, in the continuous casting process, the positions of the stopper rod head and the wrist of the submerged nozzle and the inner hole of the nozzle are all negative pressure, and the gas can diffuse towards the stopper rod head and the inner wall of the nozzle under the action of the negative pressure. When these gases meet Al in the molten steel, al is formed 2 O 3 Inclusion, ultimately leading to the generation of nodules. For example, siO in stopper and nozzle for casting aluminum killed steel 2 And basic oxides (e.g. Na) 2 O) and other impurities can generate carbothermic reduction reaction with graphite at the casting temperature (approximately equal to 1550 ℃), thereby releasing CO and SiO gas, oxidizing Al dissolved in molten steel after the gas diffuses to a refractory-molten steel interface to generate A1 2 O 3 And (4) inclusion. The reaction is as follows:
aiming at the problem of nodulation induced by carbothermic reduction reaction, the invention provides a method for improving the nodulation of an integral stopper rod and a submerged nozzle in continuous casting by using a vacuum technology.
Disclosure of Invention
The invention aims to provide a method for improving the nodulation of a continuous casting functional refractory material by using a vacuum technology, so that the nodulation problem of an integral stopper and a submerged nozzle can be solved, and the continuous casting efficiency is further improved.
The purpose of the invention can be realized by adopting the following technical scheme:
a method for improving the nodulation of the refractory material with continuous casting function by using the vacuum technology is characterized in that an air chamber is arranged in an inner hole of an integral stopper rod and an immersion type water gap; the method is characterized in that: the method comprises the steps of firstly, calculating the pressure of a flow control area between an integral stopper rod head and a wrist part of an immersion nozzle and the pressure of an inner hole area of the immersion nozzle, and taking the minimum pressure as Pmin; then communicating the air chamber with a vacuum pump through a corresponding air connecting hole; when the molten steel is continuously cast, the vacuum pump is started, a certain vacuum is formed in the air chamber and is lower than the minimum pressure Pmin, the suction force formed by the vacuum is utilized to offset the negative pressure of the flow control area and the inner hole, the diffusion of CO and SiO gases into the molten steel is reduced, and the generation of alumina is reduced so as to achieve the purpose of avoiding alumina blockage.
The vacuum pressure of the chamber is 1-5Kpa less than the minimum pressure Pmin.
The pressure of the flow control area between the integral stopper rod head and the wrist part of the submerged nozzle and the pressure of the inner hole area of the submerged nozzle are calculated by using fluid simulation software based on the parameters of the pulling speed, the height of the liquid level of the tundish and the inner diameter of the submerged nozzle.
Compared with the prior art, the method for improving the nodulation of the continuous casting functional refractory material by using the vacuum technology has the characteristic of stronger universality and has the advantage of further prolonging the service life on the basis of the prior art.
Drawings
FIG. 1 is a schematic view of an integral stopper rod gas cell.
FIG. 2 is a schematic view of a submerged entry nozzle plenum.
In the figure: 1. air inlet hole 2 and air chamber.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings.
And calculating the minimum pressure Pmin of the flow control area between the integral stopper rod head and the wrist part of the submerged nozzle, the inner hole of the submerged nozzle and other areas by utilizing fluid simulation software. According to the attached figure 1, an air chamber is arranged in an inner hole of a stopper rod or an immersion nozzle, an air receiving hole is arranged on the integral stopper rod or the immersion nozzle, the air receiving hole is connected with a vacuum pump through a pipeline, when molten steel is continuously cast, the vacuum pump is started, a certain vacuum is formed in the air chamber, and the pressure is 1-5Kpa smaller than the minimum pressure Pmin.
Example 1: numerical analysis shows that the minimum flow area pressure during continuous casting of a small square billet is 60.2KPa, an air chamber is arranged in an inner hole of a stopper rod, an air receiving hole is arranged on the whole stopper rod, the air receiving hole is connected with a vacuum pump through a pipeline, the vacuum pump is started during continuous casting of molten steel, a certain vacuum is formed in the air chamber, and the pressure is 59.2KPa.
Example 2: the minimum inner hole pressure of an immersion nozzle during the continuous casting of a certain small square billet is 62.3KPa by numerical analysis, an air chamber is arranged in the immersion nozzle, an air receiving hole is arranged on the immersion nozzle, the air receiving hole is connected with a vacuum pump through a pipeline, the vacuum pump is started during the continuous casting of molten steel, a certain vacuum is formed in the air chamber, and the pressure is 57.3KPa.
Example 3: the minimum pressure of a flow control area is 40.8Kpa and the minimum pressure of an inner hole of an immersion nozzle is 51.3Kpa when a certain slab is continuously cast through numerical analysis, air chambers are arranged in the immersion nozzle and the integral stopper, air receiving holes are arranged on the immersion nozzle and the integral stopper, the air receiving holes are connected with a vacuum pump through pipelines, the vacuum pump is started when molten steel is continuously cast, a certain vacuum is formed in the air chambers, the pressure in the air chambers of the stopper is 39.8Kpa, and the pressure in the air chambers of the immersion nozzle is 46.3Kpa.
Claims (2)
1. A method for improving the nodulation of the refractory material with continuous casting function by using the vacuum technology is characterized in that an air chamber is arranged in an inner hole of an integral stopper rod and an immersion type water gap; the method is characterized in that: the method comprises the steps of firstly, calculating the pressure of a flow control area between an integral stopper rod head and a wrist part of an immersion nozzle and the pressure of an inner hole area of the immersion nozzle, and taking the minimum pressure as Pmin; then communicating the air chamber with a vacuum pump through a corresponding air connecting hole; when the molten steel is continuously cast, the vacuum pump is started, a certain vacuum is formed in the air chamber and is lower than the minimum pressure Pmin, the suction force formed by the vacuum is utilized to counteract the negative pressure of the flow control area and the inner hole, the diffusion of CO and SiO gas into the molten steel is reduced, and the generation of alumina is reduced so as to achieve the purpose of avoiding alumina blockage.
2. The method for improving the nodulation of the continuous casting functional refractory material by using the vacuum technique as claimed in claim 1, wherein: the vacuum pressure of the air chamber is 1-5Kpa less than the minimum pressure Pmin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210876372.5A CN115213364A (en) | 2022-07-25 | 2022-07-25 | Method for improving nodulation of continuous casting functional refractory material by using vacuum technology |
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| CN202210876372.5A CN115213364A (en) | 2022-07-25 | 2022-07-25 | Method for improving nodulation of continuous casting functional refractory material by using vacuum technology |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10296406A (en) * | 1997-04-28 | 1998-11-10 | Nippon Steel Corp | Stopper rod for continuous casting |
| KR20060012181A (en) * | 2004-08-02 | 2006-02-07 | 주식회사 포스코 | Submerged nozzle |
| CN112430707A (en) * | 2020-11-05 | 2021-03-02 | 马鞍山钢铁股份有限公司 | Method for improving castability of molten low-carbon aluminum killed steel |
| CN114082910A (en) * | 2021-11-25 | 2022-02-25 | 山东钢铁股份有限公司 | Method for inhibiting water gap from being blocked |
| CN114713781A (en) * | 2022-04-18 | 2022-07-08 | 山东莱钢永锋钢铁有限公司 | Operation method for preventing immersion type water port from absorbing vacuum |
-
2022
- 2022-07-25 CN CN202210876372.5A patent/CN115213364A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10296406A (en) * | 1997-04-28 | 1998-11-10 | Nippon Steel Corp | Stopper rod for continuous casting |
| KR20060012181A (en) * | 2004-08-02 | 2006-02-07 | 주식회사 포스코 | Submerged nozzle |
| CN112430707A (en) * | 2020-11-05 | 2021-03-02 | 马鞍山钢铁股份有限公司 | Method for improving castability of molten low-carbon aluminum killed steel |
| CN114082910A (en) * | 2021-11-25 | 2022-02-25 | 山东钢铁股份有限公司 | Method for inhibiting water gap from being blocked |
| CN114713781A (en) * | 2022-04-18 | 2022-07-08 | 山东莱钢永锋钢铁有限公司 | Operation method for preventing immersion type water port from absorbing vacuum |
Non-Patent Citations (1)
| Title |
|---|
| SKCHOUDHARY , 潘秀兰: "印度塔塔钢铁公司板坯连铸机水口堵塞的成因及预防措施", 鞍钢技术, no. 06, pages 55 - 59 * |
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