Continuous casting tundish with argon blowing micropore structure

Abstract

The utility model discloses an argon blowing micropore structure continuous casting tundish which comprises an annular working lining (2) arranged in a safety lining (1), a tundish bottom working lining (3) and a breathable interlayer lining (4), an argon blowing pipe network (5) is arranged at the connecting corner of a side vertical inclined face (1a) and a horizontal bottom face (1b) of the safety lining (1), and the argon blowing pipe network (5) surrounds the bottom of the tundish to form a circle of closed pipe network loop (5a). A group of uniformly spaced air outlet holes are formed in the side top surface of the pipe network loop (5a), the air outlet holes are formed right opposite to the back of the ring working lining (2), the two ends of the argon blowing pipe network (5) are respectively connected with an air inlet pipeline (6), and the air inlet pipelines (6) extend upwards along the side vertical inclined surface (1a). The utility model has the advantages that not only can the self heat dissipation of the working lining and the auxiliary heat dissipation of inert gas be realized, but also the inclusion of molten steel can be adsorbed to play a role in purifying the molten steel.

Description

Technical Field

[0001] The utility model relates to the technical field of continuous casting tundishes for steelmaking, in particular to an argon-blown microporous structure continuous casting tundish. Background Art

[0002] Continuous casting steelmaking is the last link in steelmaking and is the key guarantee link for the stable control of molten steel quality. With the integration of industry structure and the centralization and marketization of demand for high-quality and special steel, the demand trend of tundishes that "do not increase molten steel pollution" and "purify molten steel" has become more and more prominent.

[0003] At present, the tundishes in operation on the market are mostly insulation layers, safety linings and working linings, forming a simple tundish container. The functions of purifying molten steel and refining are mostly arranged in slag retaining walls, flow stabilizers and induction heating solutions and measures, but they have basically reached a relative bottleneck, which makes it difficult to improve the quality of steelmaking. There are many inclusions in the molten steel, which affect the quality of the molten steel. The tundish cannot assist in removing them. At the same time, the temperature of the molten steel is high. The tundish directly contacts the molten steel, resulting in a large temperature rise, which cannot dissipate heat in time, causing adverse effects on the service life of the tundish. Utility Model Content

[0004] The utility model aims to solve the problems of short service life and poor quality of molten steel in the existing tundish, and provides an argon-blown microporous structure continuous casting tundish, which can not only realize self-heating of the working lining and auxiliary heat dissipation of inert gas, but also absorb molten steel inclusions to purify the molten steel.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An argon-blown microporous structure continuous casting tundish comprises an annular working lining, a ladle bottom working lining, an argon-blown pipe network and a breathable interlayer lining arranged in a safety lining, wherein the inner surface of the safety lining comprises a side inclined surface and a horizontal bottom surface, the annular working lining is connected to the side inclined surface, the ladle bottom working lining is connected to the horizontal bottom surface, and a breathable interlayer lining is arranged between the side inclined surface of the safety lining and the annular working lining;

[0007] An argon blowing pipe network is provided at the connecting corner of the side inclined surface and the horizontal bottom surface of the safety lining. The argon blowing pipe network forms a closed pipe network loop around the bottom of the tundish. A group of evenly spaced air outlet holes are provided on the side top surface of the pipe network loop. The air outlet holes are arranged facing the back of the annular working lining. The two ends of the argon blowing pipe network are respectively connected with air intake pipes, which extend upward along the side inclined surface to realize a two-way ventilation function.

[0008] Furthermore, the annular working lining is a flat prefabricated brick with a diffuse microporous structure throughout the whole body, which is connected around the side inclined surface on the inner side of the safety lining through a male and female buckle splicing combination mode to form a closed side surface.

[0009] Furthermore, the main material of the ring working lining is a corundum spinel dispersed plate with a thickness of 40-100 mm and an apparent porosity of 24.5%. After heat treatment, the structure has good strength and excellent resistance to thermal shock. At the same time, the microporous structure is not sufficient for molten steel to penetrate.

[0010] Furthermore, a curved groove is provided at the bottom of the ring working lining, with a groove depth of 5 to 20 mm and a vertical span of 20 to 40 mm.

[0011] Furthermore, the ladle bottom working lining is a magnesium coating, spray coating or dry ramming material with a thickness of 50-100 mm. The material of the ladle bottom working lining is embedded in the ring working lining through a groove to form a completely closed upper open continuous casting tundish working lining.

[0012] Furthermore, the air-permeable interlayer lining is a porous channel structure with a loose interior, which is made of a single refractory material granular material or a mixture of multiple granular materials, without fine powder filling, and has a thickness of 30 to 100 mm.

[0013] Furthermore, the refractory material filled inside the air-permeable interlayer lining is 0.5-3 mm quartz sand and sintered magnesia sand particles.

[0014] Furthermore, the argon blowing pipe network is arranged at the inner corner of the bottom of the safety substrate and in the breathable interlayer lining. The argon blowing pipe network is a steel pipe with an inner diameter of φ8~20mm, and air outlet holes of φ1~φ10mm are opened at intervals of 60~250mm in the pipe network loop.

[0015] Compared with the prior art, the advantages of the technical solution of the utility model are specifically:

[0016] (1) The tundish of the utility model can realize the function of removing impurities from the molten steel of the working lining and purifying the molten steel. Firstly, the microporous structure of the ring working lining can absorb certain inclusions. Secondly, the argon gas pipeline is set up. The inert argon gas injected with high pressure can penetrate the microporous structure of the ring working lining into the high-temperature molten steel in the tundish, and absorb the inclusions in the molten steel during the floating process, thereby reducing the adverse inclusions in the molten steel and improving the quality of the molten steel.

[0017] (2) The microporous structure of the ring working lining of the utility model can achieve heat dissipation from the back of the working lining to a certain extent. Secondly, the porous channels of the breathable interlayer lining can also accelerate the dissipation of heat. Thirdly, by blowing inert gas argon, the temperature of the back of the working lining is further reduced, which plays a good role in improving the working life of the working lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the lining of the continuous casting tundish with argon blowing microporous structure of the utility model;

[0019] Figure 2 It is a top view of the continuous casting tundish with argon blowing microporous structure of the utility model;

[0020] Figure 3 This is a partial enlarged view of the argon-blown microporous structure continuous casting tundish of the utility model. DETAILED DESCRIPTION Example

[0021] In order to make the present invention more clearly understood, an argon-blown microporous structure continuous casting tundish of the present invention is further described below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0022] See also Figure 1 , an argon blowing microporous structure continuous casting tundish, comprising a ring working lining 2 arranged in a safety lining 1, a bottom working lining 3, an argon blowing pipe network 5 and a breathable interlayer lining 4, which are interlocked to achieve the functions of argon blowing and purifying molten steel, and are characterized by:

[0023] See also Figure 1 and Figure 3 The inner surface of the safety lining 1 includes a side inclined surface 1a and a horizontal bottom surface 1b, the ring working lining 2 is connected to the side inclined surface 1a, the bottom working lining 3 is connected to the horizontal bottom surface 1b, and a breathable interlayer lining 4 is provided between the side inclined surface 1a of the safety lining 1 and the ring working lining 2;

[0024] See also Figure 2 and Figure 3 An argon blowing pipe network 5 is provided at the junction of the side inclined surface 1a and the horizontal bottom surface 1b of the safety liner 1. The argon blowing pipe network 5 forms a closed pipe network loop 5a around the bottom of the tundish. A group of evenly spaced gas outlet holes are provided on the side top surface of the pipe network loop 5a. The gas outlet holes are arranged facing the back of the annular working liner 2. The two ends of the argon blowing pipe network 5 are respectively connected with air intake pipes 6, which extend upward along the side inclined surface 1a.

[0025] See also Figure 3 The bottom working lining 3 and the ring working lining 2 are closely connected. An arc-shaped groove 2a is provided on the lower outer side of the ring working lining 2. The refractory material used for the bottom working lining 3 is embedded in the groove 2a and combined with the prefabricated flat plate with a dispersed microporous structure of the ring working lining 2 to form a completely closed upper open structure.

[0026] See also Figure 1 and Figure 2 An argon blowing pipe network 5 is provided around and in the middle of the inner side of the safety liner 1 , and the argon blowing pipe network 5 is connected to an air inlet pipe 6 at both ends of the tundish to realize a two-way ventilation function.

[0027] In this embodiment, the main material of the ring working lining 2 is a corundum spinel dispersed flat plate with a designed thickness of 60 mm. It is cast and has a compressive strength of 62.5 MPa after heat treatment at 1500°C*3h, and an apparent porosity of 24.5%.

[0028] In this embodiment, the bottom working lining 3 has a thickness of 70 mm and is a magnesium spray coating with a magnesium oxide content of more than 83%.

[0029] In this embodiment, the thickness of the air-permeable interlayer lining 4 is 50 mm, and the refractory material filled inside is 0.5-3 mm quartz sand and sintered magnesia sand particles.

[0030] In this embodiment, the main network at the bottom of the argon blowing network 5 is made of heat-resistant stainless steel, with an inner diameter of 14 mm and a wall thickness of 2 mm. The air inlet pipe 6 is an externally threaded seamless steel pipe with an outer diameter of 25 mm. The top surface of the bottom network loop 5a is provided with φ6 mm air outlet holes at intervals of 180 mm.

[0031] The microporous structure of the lining of the utility model is conducive to the transmission and dissipation of heat and the circulation of gas. After the introduction of argon gas, it can adsorb the contacted inclusions to a certain extent, reduce the adverse inclusions in the molten steel, improve the quality of the molten steel, and at the same time extend the service life of the working lining.

[0032] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. An argon-blown microporous structure continuous casting tundish, comprising an annular working lining (2), a bottom working lining (3) and a breathable interlayer lining (4) arranged in a safety lining (1), the inner surface of the safety lining (1) comprising a side inclined surface (1a) and a horizontal bottom surface (1b), the annular working lining (2) being connected to the side inclined surface (1a), the bottom working lining (3) being connected to the horizontal bottom surface (1b), and a breathable interlayer lining (4) being arranged between the side inclined surface (1a) of the safety lining (1) and the annular working lining (2), characterized in that: An argon blowing pipe network (5) is provided at the connecting corner between the side inclined surface (1a) and the horizontal bottom surface (1b) of the safety lining (1). The argon blowing pipe network (5) surrounds the bottom of the tundish to form a closed pipe network loop (5a). A group of evenly spaced gas outlet holes are provided on the side top surface of the pipe network loop (5a). The gas outlet holes are arranged facing the back of the annular working lining (2). Both ends of the argon blowing pipe network (5) are respectively connected to air inlet pipes (6), and the air inlet pipes (6) extend upward along the side inclined surface (1a).

2. The argon blowing microporous structure continuous casting tundish according to claim 1, characterized in that: The annular working lining (2) is a flat prefabricated brick with a diffuse microporous structure throughout the whole body, and is connected around the side inclined surface (1a) on the inner side of the safety lining (1) through a snap-on joint combination mode to form a closed side surface.

3. The argon blowing microporous structure continuous casting tundish according to claim 2, characterized in that: The main material of the annular working lining (2) is a corundum spinel dispersed flat plate, the thickness of which is 40-100 mm and the apparent porosity is 24.5%.

4. The argon blowing microporous structure continuous casting tundish according to any one of claims 1 to 3, characterized in that: The bottom of the annular working lining (2) is provided with a curved groove (2a), the groove has a depth of 5 to 20 mm and a vertical span of 20 to 40 mm.

5. The argon blowing microporous structure continuous casting tundish according to claim 4, characterized in that: The ladle bottom working lining (3) is a magnesium coating material, a spray coating material or a dry ramming material, and has a thickness of 50 to 100 mm. The material of the ladle bottom working lining (3) is embedded in the ring working lining (2) through the groove (2a), forming a completely closed upper open type continuous casting tundish working lining.

6. The argon blowing microporous structure continuous casting tundish according to any one of claims 1 to 3, characterized in that: The air-permeable interlayer lining (4) is a porous channel structure with a loose interior, which is made of a single refractory material granular material or a mixture of multiple granular materials, without fine powder filling, and has a thickness of 30 to 100 mm.

7. The argon blowing microporous structure continuous casting tundish according to claim 6, characterized in that: The refractory material filled inside the air-permeable interlayer lining (4) is 0.5-3 mm quartz sand and sintered magnesia sand particles.

8. The argon blowing microporous structure continuous casting tundish according to claim 6, characterized in that: The argon blowing pipe network (5) is arranged at the inner corner of the bottom of the safety liner (1) and in the breathable interlayer liner (4). The argon blowing pipe network (5) is a steel pipe with an inner diameter of φ8-20 mm. In the pipe network loop (5a), air outlet holes with a diameter of φ1-φ10 mm are provided at intervals of 60-250 mm.

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