A continuous casting tundish argon purging control device

Abstract

The utility model discloses a kind of argon purging control device of continuous casting tundish, belong to flat bloom continuous casting machine technical field, comprising: M tundish baking holes being opened on tundish;M is natural number greater than 0;M spray pipe of argon is released into the tundish;One end of the spray pipe is inserted into tundish through tundish baking hole, the other end of the spray pipe is connected with three-way through hose, and the three-way is connected with argon main pipe;Control valve is installed on the hose;Argon main pipe and argon source flow;Three tundish baking holes are opened in the top of the tundish.The utility model realizes the accurate regulation and control to gas environment in tundish by improving argon control system under the premise of completely retaining original tundish production process and production rhythm.

Description

Technical Field

[0001] This utility model belongs to the technical field of flat billet continuous casting machine, and specifically relates to an argon gas purging control device for continuous casting tundish. Background Technology

[0002] In continuous steel casting, the tundish, as a crucial metallurgical vessel connecting the ladle and the crystallizer, has a decisive influence on steel quality through its design parameters and internal structure. Modern continuous casting processes typically design tundishes with large volumes (usually in the range of 30-60 tons) and configure them with a rational flow field control system, including carefully arranged slag retaining walls, guide dams, and other internal components. The main purpose of this design is to extend the residence time of molten steel in the tundish (usually controlled at 5-8 minutes), allowing sufficient time for non-metallic inclusions in the molten steel to float to the surface and be absorbed and removed by the covering agent, thereby significantly improving the purity of the molten steel. Simultaneously, a well-designed tundish volume can effectively buffer fluctuations in molten steel flow, preventing large fluctuations in the crystallizer level and ensuring the stability of the continuous casting process.

[0003] However, a long-standing technical challenge for metallurgists exists in actual production: during the period from the end of tundish baking to the start of casting in the ladle, the tundish is filled with ambient air. Only when molten steel flows into the tundish and the liquid level gradually rises to the working level (usually controlled at around 1100 mm) can the air inside the ladle be slowly expelled. During this transition phase (usually lasting 3-4 minutes), the air filling the tundish comes into violent contact with the high-temperature molten steel, inevitably leading to a secondary oxidation reaction. This process not only significantly increases the formation of oxide inclusions in the steel but also causes a significant increase in the content of gaseous elements such as nitrogen (N) and hydrogen (H) in the molten steel. These harmful effects directly lead to internal defects such as porosity and hydrogen-induced cracks in the cast billet, while also increasing the incidence of surface quality problems such as slag inclusions, subcutaneous bubbles, and scale on the billet surface, thus greatly increasing the risk of surface cracks during subsequent rolling. It is worth noting that this phenomenon has a particularly severe impact on the quality of high-quality special steels (such as automotive steel, electrical steel, and bearing steel).

[0004] To solve this major technical problem that restricts the development of continuous casting technology, it is of great significance to design and develop an argon purging control device for continuous casting tundish. Utility Model Content

[0005] This invention provides an argon purging control device for continuous casting tundishes, which can conveniently and quickly perform argon replacement purging on the tundish without changing the original tundish production performance and rhythm, thus ensuring an inert gas environment inside the tundish.

[0006] The purpose of this utility model is to provide an argon purging control device for continuous casting tundishes, comprising: M baking holes are made in the intermediate bread; M is a natural number greater than 0. M discharge pipes are used to release argon gas into the intermediate package; one end of each discharge pipe is inserted into the intermediate package through a baking hole, and the other end of each discharge pipe is connected to a tee through a flexible hose, which is connected to the main argon gas pipe; a control valve is installed on the flexible hose; the main argon gas pipe is connected to the argon gas source.

[0007] Preferably, three baking holes are provided on the top of the intermediate package.

[0008] Preferably, the other end of each of the three discharge pipes is connected to a straight pipe.

[0009] Preferably, the straight pipe is connected to the flexible hose via a No. 2 threaded connector.

[0010] Preferably, the hose is a metal hose.

[0011] Preferably, the control valve is connected to a tee via a No. 1 threaded connector.

[0012] Preferably, the discharge pipe includes a second argon discharge pipe, a first argon discharge pipe, and a third argon discharge pipe arranged at equal intervals.

[0013] Preferably, the straight pipe is a 5-meter long straight pipe with a diameter of 4 points.

[0014] Preferably, the straight pipe is welded to the beginning of the discharge pipe.

[0015] Preferably, the length of the discharge pipe is 1200 mm.

[0016] Advantages of the solution and improvements in actual results: This invention, while fully preserving the original tundish production process and rhythm, achieves precise control of the gas environment within the tundish by improving the argon control system. The specific implementation scheme is as follows: a tee connector is added to the main argon pipeline of the argon control cabinet, from which a branch pipeline is led out. A threaded connector and a control valve are sequentially installed on this branch pipeline and connected via a flexible metal hose. Simultaneously, a 5-meter-long 4-point pipe is specially designed as the main delivery pipe. A threaded connector is welded to this pipe, connecting it to the flexible metal hose. Three 3-point diameter purging branch pipes are evenly distributed and welded onto the main delivery pipe. The entire system's piping layout is simple and efficient, and the operation is convenient and easy to implement. This novel control device is particularly suitable for the special working conditions of continuous casting tundishes, especially when casting high-quality steel. In practical applications, simply inserting the purging pipes into the tundish before casting and opening the control valve allows for a continuous 10-minute argon replacement and purging operation, ensuring a stable inert gas protective environment inside the tundish. This control system has significant advantages such as simple and reasonable pipeline layout and convenient and efficient operation process. It is an innovative device with great practical value, which can effectively solve the problem of gas environment control in on-site production and provide a reliable guarantee for the stable production of high-quality steel. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a top view of a preferred embodiment of the present invention; Figure 2 This is a front view of a preferred embodiment of the present invention.

[0018] The components are: 1. Tee; 2. No. 1 threaded connector; 3. Control valve; 4. Metal hose; 5. No. 2 threaded connector; 6. Straight pipe; 7. No. 2 argon gas release pipe; 8. No. 1 argon gas release pipe; 9. No. 3 argon gas release pipe; 10. Argon main pipe; 11. Tundish; 12. Tundish baking hole. Detailed Implementation

[0019] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] It should be noted that, unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] Please see Figure 1 and Figure 2 A continuous casting tundish argon purging control device, comprising: M intermediate baking holes 12 are formed on the intermediate bun 11; M is a natural number greater than 0; The number of M depends on the actual needs. In this embodiment, three M are selected. M venting pipes release argon gas into the intermediate package 11; the diameter of the intermediate package baking hole 12 is larger than the outer diameter of the venting pipe, so that the air inside the intermediate package is squeezed out; one end of the venting pipe is inserted into the intermediate package 11 through the intermediate package baking hole 12, and the other end of the venting pipe is connected to a tee 1 through a hose, and the tee 1 is connected to the argon gas main pipe 10; a control valve 3 is installed on the hose; the argon gas main pipe 10 is connected to the argon gas source.

[0022] Three intermediate baking holes 12 are provided on the top of the intermediate package 11.

[0023] The other end of each of the three discharge pipes is connected to the straight pipe 6.

[0024] Working principle: Before pouring, first insert the free end of the vent pipe into the intermediate bath, and then open the control valve 3. At this time, argon gas enters the intermediate bath in sequence from the argon gas source, argon gas main pipe 10, tee 1, control valve 3, hose, and vent pipe. After the argon gas enters the intermediate bath, the air in the intermediate bath is squeezed out from the intermediate bath baking hole 12, and finally a stable inert gas protective environment is formed in the intermediate bath.

[0025] To further optimize the above technical solution, the following is a non-limiting explanation: To achieve a stable connection, the straight pipe 6 is connected to the flexible hose via a second threaded connector 5.

[0026] For ease of operation, the hose is a metal hose 4.

[0027] To achieve a stable connection, the control valve 3 is connected to the tee 1 via the first threaded connector 2.

[0028] The discharge pipes include argon discharge pipe No. 2 7, argon discharge pipe No. 1 8, and argon discharge pipe No. 3 9, which are arranged at equal intervals.

[0029] The straight pipe 6 is a 5-meter long, 4-point diameter straight pipe.

[0030] The straight pipe 6 is welded to the beginning of the discharge pipe.

[0031] The length of the discharge pipe is 1200 mm.

[0032] This utility model designs and installs a DN15 stainless steel tee on the main argon pipe of the argon control cabinet next to the tundish engine. The branch end of the stainless steel tee is threaded, and a DN15 threaded connector is installed on the tee. The tee is connected to a DN15 control valve through the threaded connector. The control valve is normally closed. The control valve is connected to a 4-meter long metal hose. A 5-meter long 4-point straight pipe is drilled and welded with a threaded connector to connect to the metal hose. A 3-point argon gas release pipe is drilled and welded to the 5-meter long 4-point straight pipe. The three argon gas release pipes are 1200 mm long and can be directly inserted into the bottom of the tundish. The above technical solution is specifically designed for the special space of the tundish in continuous casting, especially for casting special steels. Before casting, the purging pipe is inserted into the tundish, the control valve is opened, and the tundish is purged with argon gas for 10 minutes to ensure an inert gas environment inside the tundish. This control method is simple, quick, and easy to operate. It is a new type of control device that effectively avoids contact between molten steel and air, reduces the chance of forming oxide inclusions (such as FeO, MnO, Al2O3, etc.), and reduces gas content: it reduces the nitrogen (N) and hydrogen (H) content in the steel, reduces porosity and hydrogen-induced cracks, ensures that the quality of the continuously cast billet meets production requirements, ensures the smooth operation of the continuous casting machine, and reduces the workload of workers.

[0033] Because the tundish is filled with air from the end of the baking process to the start of casting, a 5-meter-long straight pipe is flipped over to insert three argon gas injection pipes into the tundish through the baking hole on the tundish cover. The control valve is opened, and argon gas is injected into the tundish through the delivery pipeline. Argon gas is purged for 10 minutes. Since argon gas is denser than air, it is used to expel the air from the tundish, eventually filling it with argon gas. This creates an inert gas environment before the molten steel enters the tundish, protecting the casting process and preventing secondary oxidation of the molten steel. This reduces the chance of forming oxide inclusions, lowers the nitrogen (N) and hydrogen (H) content in the molten steel, and reduces the porosity and hydrogen-induced cracking of the billet.

[0034] This utility model relates to an argon purging control device for continuous casting tundishes. It alters the gas properties within the tundish. Previously, before casting began in the ladle, the tundish was filled with air. If molten steel flowed into the tundish from the ladle, the liquid level reached 1100 mm above the working level, slowly expelling the air. During this process, the air in the tundish came into full contact with the molten steel, inevitably causing secondary oxidation and increasing the chance of oxide inclusions. This increased nitrogen (N) and hydrogen (H) content in the molten steel led to increased porosity and hydrogen-induced cracking in the cast billet, resulting in defects such as slag inclusions, subcutaneous bubbles, and scale on the billet surface. This utility model addresses this issue by opening control valve 3 and injecting argon gas into the tundish through the delivery pipeline, using argon gas to purge the tundish. After 10 minutes of sweeping, argon gas is used to expel the air from the tundish, eventually filling it with argon gas. This creates an inert gas environment before the molten steel enters the tundish, providing protective casting. This control method is simple, quick, and easy to operate. It is a novel control device that effectively prevents molten steel from contacting air, reducing the chance of forming oxide inclusions (such as FeO, MnO, Al2O3, etc.), and reducing gas content: lowering the nitrogen (N) and hydrogen (H) content in the steel, reducing porosity and hydrogen-induced cracks, ensuring that the quality of the continuously cast billet meets production requirements, guaranteeing the smooth operation of the continuous casting machine, and mitigating the risk of surface cracks during subsequent rolling. It is particularly effective in improving the quality of specialty steels, solving billet quality problems, and reducing the workload of workers in finishing the billets, which is of great significance.

[0035] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A continuous casting tundish argon purging control device, characterized in that, include: M baking holes (12) are formed on the intermediate bread (11); M is a natural number greater than 0; M discharge pipes are used to release argon gas into the intermediate package (11); one end of the discharge pipe is inserted into the intermediate package (11) through the intermediate package baking hole (12), and the other end of the discharge pipe is connected to the tee (1) through a hose, and the tee (1) is connected to the argon gas main pipe (10); a control valve (3) is installed on the hose; the argon gas main pipe (10) is connected to the argon gas source.

2. The argon purging control device for continuous casting tundish according to claim 1, characterized in that, Three intermediate baking holes (12) are provided on the top of the intermediate package (11).

3. The argon purging control device for continuous casting tundish according to claim 2, characterized in that, The other ends of the three discharge pipes are all connected to the straight pipe (6).

4. The argon purging control device for continuous casting tundish according to claim 3, characterized in that, The straight pipe (6) is connected to the hose through the No. 2 threaded connector (5).

5. The argon purging control device for continuous casting tundish according to claim 4, characterized in that, The hose is a metal hose (4).

6. The argon purging control device for continuous casting tundish according to claim 1, characterized in that, The control valve (3) is connected to the tee (1) via a No. 1 threaded connector (2).

7. The argon purging control device for continuous casting tundish according to claim 1, characterized in that, The discharge pipes include a second argon discharge pipe (7), a first argon discharge pipe (8), and a third argon discharge pipe (9) arranged at equal intervals.

8. The argon purging control device for continuous casting tundish according to claim 3, characterized in that, The straight pipe (6) is a 5-meter long, 4-point diameter straight pipe.

9. The argon purging control device for continuous casting tundish according to claim 8, characterized in that, The straight pipe (6) is welded to the beginning of the discharge pipe.

10. The argon purging control device for continuous casting tundish according to claim 1, characterized in that, The length of the discharge pipe is 1200 mm.

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