Method for controlling oxidation of water gap between continuous casting tundish plates

Abstract

The invention discloses a method for controlling oxidation of a nozzle between continuous casting tundish plates, which belongs to the technical field of continuous casting slabs, and comprises the following steps: extending a surface refractory material part of a submersed nozzle to the upper part of a steel shell; the pulling speed is adjusted to 0.55 m / min to 0.65 m / min when the water gap is replaced; the pressure of a hydraulic oil cylinder for replacing the water gap is controlled to be 10-15 bar; the replacement time of the water gap in the slide way is controlled to be 0.5-1.5 s; the argon pressure of the water gap between the plates is optimized and adjusted to 0.3 Mpa to 0.5 Mpa; and the argon flow between the plates is not less than 8L / min. By optimizing the size of the plate surface of the submersed nozzle and accurately controlling the pressure of the hydraulic oil cylinder, it is ensured that operation can be stably and rapidly completed in the process of replacing the submersed nozzle, the risk of the phenomenon that steel is clamped between plates when the nozzle is replaced is remarkably reduced, and by optimizing the argon pressure and flow between the plates, the replacement efficiency of the submersed nozzle is improved. And the argon sealing protection effect of the water gap between the plates is improved, and the pouring safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of continuous casting slab, and particularly relates to a method for controlling the oxidation of the submerged nozzle between the slabs in the tundish. Background Art

[0002] In the current continuous casting production process, the oxidation problem of the submerged nozzle between the slabs in the tundish has always been a difficult problem that has received much attention. This oxidation phenomenon will cause serious oxidation erosion on the surface of the nozzle plate, and may then lead to a steel penetration accident, which not only has a great negative impact on production efficiency, but also may increase the safety risks faced by the staff and production equipment. In view of this, finding effective solutions to address the oxidation problem between the slabs in the tundish has become a very important topic. To meet this challenge, researchers and engineers need to deeply analyze the causes of oxidation, explore various possible protective measures, and develop new materials or technologies to reduce the impact of oxidation on the submerged nozzle between the slabs in the tundish. Summary of the Invention

[0003] The present invention provides a method for controlling the oxidation of the submerged nozzle between the slabs in the tundish, aiming to solve this important problem that has long troubled continuous casting production and provide an effective solution for improving continuous casting production efficiency and optimizing the production process.

[0004] The object of the present invention is to provide a method for controlling the oxidation of the submerged nozzle between the slabs in the tundish, including:

[0005] Extend the refractory part of the surface of the submerged nozzle to the upper part of the steel shell;

[0006] Adjust the casting speed to 0.55 m / min to 0.65 m / min when changing the nozzle;

[0007] Control the pressure of the hydraulic cylinder for changing the nozzle at 10 bar to 15 bar;

[0008] Control the replacement time of the nozzle on the slide at 0.5 s to 1.5 s;

[0009] During the steel casting process, optimize and adjust the argon pressure of the submerged nozzle between the slabs to 0.3 Mpa to 0.5 Mpa;

[0010] The argon flow rate between the slabs is not less than 8 L / min.

[0011] Preferably, adjust the casting speed to 0.6 m / min when changing the nozzle.

[0012] Preferably, control the pressure of the hydraulic cylinder for changing the nozzle at 10 bar, or 12 bar, or 15 bar.

[0013] Preferably, control the replacement time of the nozzle on the slide at 0.5 s, or 0.8 s, or 1.5 s.

[0014] Preferably, the argon flow rate between the plates is adjusted to 8 L / min, or 9 L / min, or 10 L / min.

[0015] Preferably, the slab is a plain carbon steel slab; the size is 230 mm * 1500 mm.

[0016] The advantages and positive effects of the present invention are as follows:

[0017] The core of the present invention lies in optimizing the size of the immersed nozzle plate surface and precisely controlling the pressure applied by the hydraulic cylinder to ensure that the operation can be completed steadily and quickly during the replacement of the immersed nozzle. In this way, the risk of steel clamping between the plates during the replacement of the nozzle can be significantly reduced, thereby improving production efficiency. In addition, by optimizing the pressure and flow rate of argon between the nozzle plates, the safety of the entire steel casting process is further improved, ensuring the purity and quality of the molten steel.

[0018] At the same time, the present invention also relates to the precise control of the casting speed during the replacement of the nozzle, which can effectively reduce the risk of steel clamping between the plates during the replacement of the nozzle. Specifically, through these technical measures, the accident rate of steel penetration due to oxidation between the nozzle plates can be reduced to less than 0.01%, thereby greatly improving the continuity of continuous casting steel casting and meeting the higher standard industrial application requirements. This not only improves production efficiency but also ensures the stability and reliability of the production process, bringing a revolutionary progress to the steel manufacturing industry. Brief Description of the Drawings

[0019] Figure 1 It is a schematic diagram after the optimization of the immersed nozzle plate surface. Detailed Embodiments

[0020] To further understand the content, features and effects of the present invention, the following embodiments are exemplified and described in detail in conjunction with the drawings as follows:

[0021] As Figure 1 shown, a method for controlling the oxidation of the nozzle between the tundish plates of continuous casting includes:

[0022] Extend the refractory part of the immersed nozzle plate surface to the upper part of the steel shell;

[0023] Adjust the casting speed during the replacement of the nozzle to 0.55 m / min to 0.65 m / min; for example, adjust the casting speed during the replacement of the nozzle to 0.6 m / min;

[0024] Control the pressure of the hydraulic cylinder for replacing the nozzle at 10 bar to 15 bar; for example, control the pressure of the hydraulic cylinder for replacing the nozzle at 10 bar, or 12 bar, or 15 bar;

[0025] Control the submerged nozzle replacement time between 0.5 s and 1.5 s; for example, control the submerged nozzle replacement time to be 0.5 s, or 0.8 s, or 1.5 s;

[0026] During the steel casting process, optimize and adjust the argon pressure between the plates of the submerged nozzle to 0.3 Mpa - 0.5 Mpa; for example,

[0027] The argon flow rate between the plates is not less than 8 L / min; for example, adjust the argon flow rate between the plates to 8 L / min, or 9 L / min, or 10 L / min.

[0028] The slab can be a plain carbon steel slab; with dimensions of 230 mm * 1500 mm.

[0029] In order to improve the production efficiency of the continuous caster, the primary task of the present invention is to precisely adjust the size of the surface of the submerged nozzle and optimize the drawing speed during nozzle replacement. The specific implementation method includes extending the refractory part of the surface of the submerged nozzle upward to the steel shell. In this way, during the process of replacing the nozzle, the gap between two nozzles can be reduced by 3 mm, thus achieving a seamless connection effect; at the same time, reduce the drawing speed during nozzle replacement from 0.8 m / min to 0.6 m / min. Such operations can not only ensure reducing the risk of steel clamping between plates during the process of replacing the submerged nozzle, but also effectively improve the production efficiency.

[0030] In the subsequent production process, it is particularly important to carefully optimize the pressure applied to the hydraulic cylinder. Especially during the process of replacing the submerged nozzle, we must precisely control the pressure of the submerged nozzle hydraulic cylinder to stabilize it at an appropriate level of 12 bar. This precise pressure control is crucial for ensuring that the nozzle can smoothly slide to the predetermined replacement position, and the time of this process should be strictly controlled within 0.8 seconds. Through such precise operations, we can effectively avoid the bad phenomenon of steel clamping between plates during nozzle replacement, thereby reducing the caster stop events caused by nozzle replacement. In this way, not only can the continuity and stability of the entire production process be improved, but also the production efficiency can be significantly increased to ensure the smooth realization of production goals.

[0031] In addition, during the steel casting process, it is also necessary to carefully adjust the argon flow rate and pressure between the plates of the submerged nozzle. Specifically, adjust the argon flow rate between the plates to 9 liters per minute, and at the same time ensure that the pressure remains at 0.4 megapascals. Such operations can effectively seal and protect the area between the plates, thereby ensuring the smooth progress of the entire steel casting process.

[0032] In order to further improve and optimize all aspects of the production process, the present invention proposes a comprehensive control method. First, by establishing a detailed database and combining the drawing speed during the replacement of the submerged nozzle in actual production, a most suitable drawing speed for nozzle replacement is carefully selected. This step is crucial because it directly affects production efficiency and product quality. Secondly, by establishing another database, a suitable pressure value for the nozzle hydraulic cylinder is carefully selected to ensure that the replacement of the nozzle is completed quickly within 0.5 to 1.5 seconds, and at the same time, no steel clamping phenomenon occurs between the slabs, thus avoiding the unfavorable situation where the straightener has to stop during nozzle replacement. Finally, by establishing a third database, a suitable argon gas flow rate and pressure value for the nozzle between the slabs are selected to ensure the best argon gas protection effect between the slabs, thereby ensuring the smooth progress of the production process.

[0033] During the process of controlling the slab seam, taking a plain carbon steel slab with dimensions of 230 mm by 1500 mm as an example, first, it is necessary to optimize the surface size of the submerged nozzle to achieve seamless connection, which is crucial for ensuring product quality. At the same time, when replacing the nozzle, the drawing speed is optimized to 0.6 m / min, which is obtained through precise calculation and aims to improve production efficiency without sacrificing product quality. Then, the pressure of the nozzle replacement hydraulic cylinder is controlled at 12 bar to ensure that the time for the nozzle to slide to the replacement position is 0.8 seconds. This time window is obtained through repeated tests and adjustments, aiming to shorten the replacement time as much as possible while ensuring safety. Finally, the argon gas flow rate between the slabs is adjusted to 9 L / min, and the pressure is maintained at 0.4 Mpa. Such parameter settings are to ensure good argon gas protection effect between the slabs, thereby effectively reducing the occurrence of oxidation and steel penetration accidents between the slabs and improving the production efficiency of the continuous casting machine. By implementing these comprehensive measures, the stability of the production process and the production efficiency of the continuous casting machine can be significantly improved, while reducing production costs and enhancing the market competitiveness of products.

[0034] The above description is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are all within the scope of the technical solution of the present invention.

Claims

1. A method for controlling the oxidation of the submerged entry nozzle between the plates of a continuous casting tundish, characterized in that, Including: Extend the refractory part of the submerged nozzle plate surface to the upper part of the steel shell; Adjust the casting speed to 0.55 m / min to 0.65 m / min when replacing the nozzle; Control the pressure of the hydraulic cylinder for replacing the nozzle at 10 bar to 15 bar; Control the replacement time of the nozzle on the slide at 0.5 s to 1.5 s; During the steel casting process, optimize and adjust the argon pressure between the plates of the nozzle to 0.3 Mpa to 0.5 Mpa; The argon flow rate between the plates is not less than 8 L / min.

2. The method for controlling the oxidation of the submerged nozzle between the tundish plates according to claim 1, wherein Adjust the casting speed to 0.6 m / min when replacing the nozzle.

3. The method for controlling the oxidation of the submerged nozzle between the tundish plates according to claim 1, characterized in that, Control the pressure of the hydraulic cylinder for replacing the nozzle at 10 bar, or 12 bar, or 15 bar.

4. The method for controlling the oxidation of the submerged nozzle between the tundish plates according to claim 1, characterized in that, Control the replacement time of the nozzle on the slide at 0.5 s, or 0.8 s, or 1.5 s.

5. The method for controlling oxidation of the submerged nozzle between the tundish plates according to claim 1, characterized in that, Adjust the argon flow rate between the plates to 8 L / min, or 9 L / min, or 10 L / min.

6. The method for controlling oxidation of the submerged nozzle between the tundish plates according to any one of claims 1-5, characterized in that, The slab is a plain carbon steel slab; the size is 230 mm * 1500 mm.

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