Tundish flow stabilizer for improving casting blank quality

Abstract

According to the tundish flow stabilizer for improving the quality of the casting blank, a molten steel cavity is formed in the top of the tundish flow stabilizer, and an upper flow blocking edge and a lower flow blocking edge are arranged on the inner wall of the molten steel cavity; the space between the bottom surface of the molten steel cavity and the bottom surface of the lower flow blocking edge forms a lower molten steel cavity, the bottom surface of the lower molten steel cavity forms a molten steel impact surface which is firstly in contact with molten steel, and a molten steel impact mesh is fixedly arranged on the molten steel impact surface; a middle molten steel cavity is formed in a space between the top surface of the lower flow blocking edge and the bottom surface of the upper flow blocking edge; an upper molten steel cavity is formed in a space between the top surface of the upper flow blocking edge and the top of the molten steel cavity; the tundish flow stabilizer is of a double-inner-cavity structure and is composed of a middle molten steel cavity and a lower molten steel cavity, the middle molten steel cavity and the lower molten steel cavity are arranged up and down, so that the tundish flow stabilizer always has a molten steel level of about 500 mm, the effect of buffering steel ladle flow to a great extent is achieved, and the impact force of the steel flow on the tundish flow stabilizer is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of continuous casting tundish, in particular to a tundish flow stabilizer for improving the quality of casting billets. Background Art

[0002] The tundish is an essential equipment in steelmaking and continuous casting production. Its main function is to receive the molten steel poured by the ladle, and evenly and orderly distribute the molten steel to each stream of the tundish, playing the role of transition, buffering, diversion, uniform temperature and composition of molten steel, and promoting the floating of inclusions in the molten steel. The tundish flow stabilizer is installed at the bottom of the tundish impact zone. On the one hand, it is a functional refractory material used to stabilize the flow of molten steel in the tundish water inlet area, prevent slag from being drawn into the molten steel to cause internal quality defects of the continuous casting billet, promote the floating of inclusions and reduce the splashing of molten steel. On the other hand, it is a reasonable design of the inner cavity size of the flow stabilizer to buffer the direct scouring of the ladle steel flow on the bottom of the tundish to achieve the purpose of prolonging the life of the tundish impact zone.

[0003] There are two main types of tundish flow stabilizers currently used. One type is the "reinforced impact zone". This type of flow stabilizer can meet the requirements of a higher life to a certain extent due to its "thickness". However, after the tundish is damaged by the erosion of molten steel in the later stage of pouring, the floating condition of inclusions in the molten steel is further deteriorated. The other type is a container-shaped flow stabilizer with an open upper part of the inner cavity. The floating of inclusions in the molten steel is better than the former, but the effective life is about 20 hours, and the role of facilitating the floating of inclusions in the later stage of pouring is basically lost.

[0004] Therefore, the current flow stabilizer has a short service life or problems with the quality of use. In order to meet production needs, it is necessary to improve the current middle package flow stabilizer so as to extend the service life of the flow stabilizer. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a tundish flow stabilizer with a reasonable structural design and a double inner cavity structure, which, on the one hand, improves the function of the flow stabilizer in stabilizing the liquid level of molten steel, and on the other hand, prolongs the service life of the flow stabilizer to meet the casting cycle of the tundish of 60 hours or more, and during which the function of the flow stabilizer is not attenuated or weakened, thereby improving the quality of the casting.

[0006] The technical problem to be solved by the utility model is achieved through the following technical scheme: a tundish flow stabilizer for improving the quality of the ingot, the top of the tundish flow stabilizer has a molten steel cavity, an upper flow blocking edge and a lower flow blocking edge are arranged on the inner wall of the molten steel cavity, and the upper flow blocking edge and the lower flow blocking edge are fixed up and down in the molten steel cavity of the tundish flow stabilizer;

[0007] The space between the bottom surface of the molten steel cavity and the bottom surface of the lower flow-blocking edge forms a lower molten steel cavity, and the bottom surface of the lower molten steel cavity forms a molten steel impact surface that first contacts the molten steel, and a molten steel impact grid is fixedly provided on the molten steel impact surface;

[0008] The space between the top surface of the lower baffle edge and the bottom surface of the upper baffle edge forms a middle molten steel cavity;

[0009] The space between the top surface of the upper baffle edge and the top of the molten steel cavity forms an upper molten steel cavity, and a molten steel outlet for molten steel to flow into the tundish is provided on the top side wall of the tundish flow stabilizer near the upper molten steel cavity.

[0010] Preferably, both the outer wall and the inner wall of the middle package flow stabilizer have a certain slope, and the slope of the outer wall of the middle package flow stabilizer is different from the slope of the inner wall of the middle package flow stabilizer.

[0011] Preferably, the wall thickness of the lower molten steel cavity is 80 mm and the depth is 200 mm.

[0012] Preferably, the wall thickness of the middle molten steel cavity is 120 mm and the depth is 100 mm.

[0013] Preferably, the wall thickness of the upper molten steel cavity is 160 mm and the depth is 320 mm.

[0014] Preferably, the material of the molten steel impact grid is magnesium or high-aluminum material, and the thickness of the molten steel impact grid is 25mm~35mm.

[0015] Preferably, the molten steel impact grid has a plurality of regular polygonal meshes, and the mesh size is 8 mm to 16 mm.

[0016] Preferably, the molten steel impact grid is located in the middle of the molten steel impact surface, and the width of the molten steel impact grid is greater than the width of the middle molten steel cavity.

[0017] Compared with the prior art, the beneficial technical effects of the utility model are:

[0018] (1) The tundish flow stabilizer has a double inner cavity structure, which consists of a middle molten steel cavity and a lower molten steel cavity. In the early stage of tundish pouring, the middle molten steel cavity mainly promotes the floating of debris and buffers the steel flow of the ladle pouring downward. The middle molten steel cavity and the lower molten steel cavity are arranged up and down, so that the tundish flow stabilizer always maintains a steel liquid level of about 500mm, which greatly buffers the steel flow of the ladle and reduces the impact of the steel flow on the tundish flow stabilizer;

[0019] (2) The upper and lower baffle edges arranged on the inner wall of the molten steel cavity of the tundish flow stabilizer can buffer the impact of the steel flow to the greatest extent, and the molten steel impact grid located on the bottom wall of the molten steel cavity can further improve the structural strength of the bottom wall of the tundish flow stabilizer, and buffer the impact force on the bottom wall of the tundish flow stabilizer in the early stage of tundish pouring, thereby maximizing the service life of the tundish flow stabilizer;

[0020] (3) The thickness of the upper part of the middle ladle flow stabilizer is greater than that of the lower part, which makes the structural strength of the upper part of the middle ladle flow stabilizer, which is the impact zone of the molten steel, higher. The overall consumables are much lower than those of the existing all-round thickened flow stabilizer, saving more than 1 / 3 of the refractory materials. It is economical and practical, and has a low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the main cross-section structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the top view of the structure of the molten steel impact grid of the utility model.

[0023] In the figure: 1. upper flow-blocking edge; 2. lower flow-blocking edge; 3. lower molten steel cavity; 4. molten steel impact grid; 5. middle molten steel cavity; 6. upper molten steel cavity; 7. molten steel outlet. DETAILED DESCRIPTION

[0024] The specific technical solutions of the present invention are further described below with reference to the accompanying drawings, so as to facilitate further understanding of the present invention by those skilled in the art, and do not constitute any limitation to the rights thereof.

[0025] Example 1, reference Figure 1-2 A middle bag flow stabilizer for improving the quality of the casting, the material of which is selected from corundum or magnesium aluminum spinel, and is integrally cast or assembled in two halves, and the height can be 900mm. The outer wall and the inner wall of the middle bag flow stabilizer have a certain slope, and the slope size can be selected according to the use requirements. The slope of the outer wall of the middle bag flow stabilizer is different from the slope of the inner wall of the middle bag flow stabilizer, that is, the upper thickness of the middle bag flow stabilizer is greater than the lower thickness, which makes the upper part of the middle bag flow stabilizer as the steel liquid impact zone higher in structural strength, and the overall consumables are much lower than the existing all-round thickened flow stabilizer, saving more than 1 / 3 of refractory materials, strong economic practicality, and low production cost;

[0026] The top of the tundish flow stabilizer is provided with a molten steel cavity, and an upper flow blocking edge 1 and a lower flow blocking edge 2 are arranged on the inner wall of the molten steel cavity. The upper flow blocking edge 1 and the lower flow blocking edge 2 arranged on the inner wall of the molten steel cavity of the tundish flow stabilizer can buffer the impact of the steel flow to the greatest extent. The upper flow blocking edge 1 and the lower flow blocking edge 2 are formed into a roughly square block structure. The upper flow blocking edge 1 and the lower flow blocking edge 2 are fixed up and down in the molten steel cavity of the tundish flow stabilizer, and the molten steel cavity is used for the steel flow to flow in;

[0027] The space between the bottom surface of the molten steel cavity and the bottom surface of the lower flow-blocking edge 2 forms a lower molten steel cavity 3, wherein the wall thickness of the lower molten steel cavity 3 is 80 mm and the depth is 200 mm;

[0028] The bottom surface of the lower molten steel cavity 3 forms a molten steel impact surface that first contacts the molten steel. A molten steel impact grid 4 is fixedly provided on the molten steel impact surface. The molten steel impact grid 4 is formed into a roughly square grid structure. The molten steel impact grid 4 is made of magnesium or high aluminum material. The thickness of the molten steel impact grid 4 is 25 mm to 35 mm. The molten steel impact grid 4 has a plurality of regular polygonal meshes, and the mesh size is 8 mm to 16 mm. The molten steel impact grid 4 is located in the middle of the molten steel impact surface. The molten steel impact grid 4 located on the bottom wall of the molten steel cavity can also further improve the bottom wall structural strength of the middle ladle flow stabilizer, and buffer the impact force on the bottom wall of the middle ladle flow stabilizer in the early stage of the tundish pouring, thereby maximizing the service life of the middle ladle flow stabilizer.

[0029] The width of the molten steel impact grid 4 is greater than the width of the middle molten steel cavity, so that the molten steel impact grid 4 bears the impact force of all steel flows falling into the lower flow-blocking edge 2 and the lower molten steel cavity 3, and to a certain extent buffers the impact force on the bottom wall of the middle ladle flow stabilizer in the early stage of tundish pouring, thereby maximizing the service life of the middle ladle flow stabilizer;

[0030] The space between the top surface of the lower baffle edge 2 and the bottom surface of the upper baffle edge 1 forms a middle molten steel cavity 5, and the wall thickness of the middle molten steel cavity 5 is 120 mm and the depth is 100 mm;

[0031] The space between the top surface of the upper flow-blocking edge 1 and the top of the molten steel cavity forms an upper molten steel cavity 6, the wall thickness of the upper molten steel cavity 6 is 160 mm and the depth is 320 mm. A molten steel outlet 7 is provided on the top side wall of the tundish flow stabilizer near the upper molten steel cavity 6 for the molten steel to flow into the tundish.

[0032] The service life of the tundish flow stabilizer for improving the quality of the ingot is 1.5 to 3 times that of the traditional flow stabilizer when in use, and can be fully synchronized with the life of the existing tundish. During the entire tundish pouring cycle, the inclusions in the molten steel can fully float up, and the upper thickness of the tundish flow stabilizer is greater than the lower thickness, which makes the structural strength of the upper part of the tundish flow stabilizer as the molten steel impact zone higher. The overall consumables are much lower than those of the existing all-round thickened flow stabilizer, saving more than 1 / 3 of refractory materials, with strong economical practicality and low manufacturing cost.

Claims

1. A tundish flow stabilizer for improving the quality of ingot casting, wherein the top of the tundish flow stabilizer has a molten steel cavity, and is characterized in that: An upper flow-blocking edge and a lower flow-blocking edge are arranged on the inner wall of the molten steel cavity, and the upper flow-blocking edge and the lower flow-blocking edge are fixed vertically in the molten steel cavity of the tundish flow stabilizer; The space between the bottom surface of the molten steel cavity and the bottom surface of the lower flow-blocking edge forms a lower molten steel cavity, and the bottom surface of the lower molten steel cavity forms a molten steel impact surface that first contacts the molten steel, and a molten steel impact grid is fixedly provided on the molten steel impact surface; The space between the top surface of the lower baffle edge and the bottom surface of the upper baffle edge forms a middle molten steel cavity; The space between the top surface of the upper baffle edge and the top of the molten steel cavity forms an upper molten steel cavity, and a molten steel outlet for molten steel to flow into the tundish is provided on the top side wall of the tundish flow stabilizer near the upper molten steel cavity.

2. A tundish flow stabilizer for improving the quality of the casting according to claim 1, characterized in that: The outer wall and the inner wall of the middle package flow stabilizer both have a certain slope, and the slope of the outer wall of the middle package flow stabilizer is different from the slope of the inner wall of the middle package flow stabilizer.

3. The tundish flow stabilizer for improving the quality of the casting according to claim 1, characterized in that: The wall thickness of the lower molten steel cavity is 80 mm and the depth is 200 mm.

4. The tundish flow stabilizer for improving the quality of the casting according to claim 1, characterized in that: The wall thickness of the middle molten steel cavity is 120 mm and the depth is 100 mm.

5. The tundish flow stabilizer for improving the quality of the casting according to claim 1, characterized in that: The wall thickness of the upper molten steel cavity is 160 mm and the depth is 320 mm.

6. A tundish flow stabilizer for improving the quality of the casting according to any one of claims 1 to 5, characterized in that: The material of the molten steel impact grid is magnesium or high-aluminum material, and the thickness of the molten steel impact grid is 25mm~35mm.

7. A tundish flow stabilizer for improving the quality of the casting according to claim 6, characterized in that: The molten steel impact grid is provided with a plurality of regular polygonal meshes, and the mesh size is 8mm-16mm.

8. The tundish flow stabilizer for improving the quality of the casting according to claim 6, characterized in that: The molten steel impact grid is located in the middle of the molten steel impact surface, and the width of the molten steel impact grid is greater than the width of the middle molten steel cavity.

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