Continuous casting tundish with micropore ventilation structure

Abstract

The utility model discloses a continuous casting tundish with a micropore ventilation structure, which comprises a steel shell (1), a safety lining (3) is connected in the steel shell (1), the inner surface of the safety lining (3) comprises a bottom surface (4) and a side vertical inclined surface (5) which are connected, the side vertical inclined surface (5) is connected with a working lining (6), and a ventilation interlayer lining (7) is arranged between the working lining (6) and the safety lining (3); the ladle base brick (2) is embedded on the bottom surface (4), the bottom surface (4) is connected with a ladle bottom working lining (8), and the ladle bottom working lining (8) is tightly connected with the working lining (6); and the steel shell (1), the safety lining (3), the working lining (6), the breathable interlayer lining (7), the tundish bottom working lining (8) and the tundish base brick (2) are linked with one another to form a tundish lining body structure with a multi-layer micropore structure. The utility model has the advantages that the heat dissipation of the working lining is facilitated, molten steel inclusions are adsorbed, the service life is prolonged, and the structural strength is improved, so that the cleanliness of molten steel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of refractory materials for continuous casting, in particular to a continuous casting tundish with a microporous air-permeable structure. Background Art

[0002] At present, the tundishes in operation on the market are mostly insulation layers, safety linings also called permanent linings, and working linings. Most of the safety linings are cast with relatively dense castables, while the working linings are mainly divided into three categories: coating linings, dry linings, and spray linings. Each has its own advantages and disadvantages, but none of them can achieve the function of absorbing inclusions. In addition, the materials used are accompanied by more impurity elements and are not strong enough, so there is a risk of being washed into the molten steel, thereby affecting the quality of the molten steel.

[0003] In addition, for the working lining, because the temperature of the steel surface in contact with the molten steel is relatively high, the steel slag causes deep erosion of the working lining, and it is relatively difficult to extend the service life of the working lining again. Utility Model Content

[0004] The utility model aims to solve the problems of the existing tundish with many impurities, low strength, easy erosion and short life, and provides a continuous casting tundish with a microporous breathable structure, which is not only conducive to the heat dissipation of the working lining, but also can absorb molten steel inclusions, prolong the service life, improve the strength of the structure, and thus improve the cleanliness of the molten steel.

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

[0006] A continuous casting tundish with a microporous air-permeable structure, comprising a steel shell and a tundish base brick that cooperate with each other, a safety lining connected inside the steel shell, an inner surface of the safety lining comprising a connected bottom surface and a side inclined surface, a working lining connected to the side inclined surface, and an air-permeable interlayer lining provided between the working lining and the safety lining;

[0007] The base bricks are embedded in the bottom surface, and the bottom surface of the safety lining is connected with the base working lining, and the base working lining is closely connected with the working lining;

[0008] The steel shell, safety lining, working lining, breathable interlayer lining, ladle bottom working lining and ladle base bricks are interlocked to form an intermediate ladle lining structure with a multi-layer microporous structure.

[0009] Furthermore, the safety lining is a porous lightweight heat-insulating structure, and stainless steel steel anchor nails are fixed to the inner side of the steel shell, and the steel shell is connected to the safety lining as a whole through the steel anchor nails.

[0010] Furthermore, the main material of the safety lining is silica sol combined with mullite castable, with a thickness of 130-180 mm and a compressive strength of >50 MPa, so as to improve the medium-temperature structural strength and thermal shock resistance after heating.

[0011] Furthermore, the working lining is a flat prefabricated brick with a diffuse microporous structure throughout the whole body, which is formed into a circle on the side inclined surface through a splicing combination mode to form a side-enclosed working lining.

[0012] Furthermore, the open porosity of the working lining is 20% to 30%, and the pores are relatively continuous. Its compressive strength is ≥45MPa and its thickness is 40 to 80mm to ensure its safety in use.

[0013] Furthermore, the bottom working lining is a magnesium coating material, a spray coating material or a dry ramming material, and its thickness is 60 mm to 120 mm.

[0014] Furthermore, a groove is provided on the lower outer side of the flat precast bricks of the working lining, and the refractory material used for the bottom-wrapped working lining is embedded in the groove and combined with the flat precast bricks of the working lining to form a completely closed upper open structure.

[0015] Furthermore, the breathable interlayer lining is a non-dense structural layer filled with coarse particles, with a thickness of 20 to 60 mm, so as to take into account both high breathability and heat dissipation functions and safety support functions.

[0016] Furthermore, the air-permeable interlayer lining is a refractory raw material granular material with relatively high refractoriness, and its particle size is 0.5-5 mm.

[0017] Compared with the prior art, the advantages of the technical solution of the utility model are specifically:

[0018] (1) The utility model eliminates the use of the traditional insulation layer in the tundish, which to a certain extent makes up for the instability of the powdered vacancies formed by the repeated use of the insulation refractory wool in the later stage of the tundish, and to a certain extent improves the structural stability and safety;

[0019] (2) The main material of the tundish safety lining of the utility model is lightweight mullite, which has high porosity, low thermal conductivity and excellent high-temperature performance, so that the lining has good thermal shock resistance and thermal insulation performance; secondly, the use of silica sol bonding makes its overall strength better, further improving the structural stability and firmness;

[0020] (3) The utility model tundish is designed with a breathable interlayer between the safety lining and the working lining, which plays a role in supporting the working lining to a certain extent. More importantly, the interlayer is a microporous porous structure, which increases the heat dissipation function of the back of the working lining, thereby reducing the overall working temperature environment of the working lining and is more conducive to the service life of the working lining;

[0021] (4) The working lining of the tundish of the utility model is a prefabricated flat brick with a microporous structure. In addition to having good anti-scouring performance, it also has a certain function of absorbing inclusions in molten steel, thus playing a role in purifying molten steel in the tundish. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the lining structure of the continuous casting tundish with a microporous air-permeable structure of the utility model;

[0023] Figure 2 It is a top view of the continuous casting tundish with a microporous air-permeable structure of the utility model;

[0024] Figure 3 It is a partial cross-sectional view of the continuous casting tundish with a microporous breathable structure of the utility model. DETAILED DESCRIPTION Example 1

[0025] In order to make the utility model more clear, a continuous casting tundish with a microporous breathable structure of the utility model is further described below in conjunction with the accompanying drawings. The specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] See also Figure 1 and Figure 2 , a continuous casting tundish with a microporous air-permeable structure, comprising a steel shell 1 and a tundish base brick 2 that cooperate with each other, characterized in that:

[0027] See also Figure 1 and Figure 3 The steel shell 1 is connected with a safety lining 3, the inner surface of the safety lining 3 includes a bottom surface 4 and a side inclined surface 5 connected to each other, a working lining 6 is connected to the side inclined surface 5, and a breathable interlayer lining 7 is provided between the working lining 6 and the safety lining 3;

[0028] The base brick 2 is embedded in the bottom surface 4, and the bottom surface 4 of the safety lining 3 is connected with the base working lining 8, and the base working lining 8 is closely connected with the working lining 6;

[0029] A groove 9 is provided on the lower outer side of the working lining 6, and the refractory material used for the bottom working lining 8 is embedded in the groove 9 and combined with the flat precast bricks of the working lining 6 to form a completely closed upper open structure;

[0030] The steel shell 1, the safety lining 3, the working lining 6, the breathable interlayer lining 7, the ladle bottom working lining 8 and the ladle base bricks 2 are interlocked to form an intermediate ladle lining structure with a multi-layer microporous structure.

[0031] The steel shell 1 of the utility model is provided for a steelmaking plant, and the base bricks 2 of the base are mainly used to provide a fixed platform for the steel tapping of the bottom water outlet of the tundish, so that the molten steel can accurately enter the continuous casting crystallizer.

[0032] In this embodiment, the safety lining 3 is cast by mullite silica sol combined with castable material, with a thickness of 160 mm. After baking and heating, the medium temperature structure has good strength, the compressive strength reaches 85.60 MPa, and the volume density is 2.35 g / cm 3 , the apparent porosity is 19.7%.

[0033] In this embodiment, the bottom working lining 8 has a thickness of 80 mm and is a magnesium-calcium ramming material.

[0034] In this embodiment, the working lining 6 facing the steel surface is 55 mm thick and is a magnesium spinel dispersion sintered pre-treated flat plate. The groove 9 at the bottom is 15 mm deep, 25 mm in height, 22.7% in porosity, and has a compressive strength of 60.63 MPa after heat treatment at 1450°C*3h.

[0035] In this embodiment, the thickness of the air-permeable interlayer lining 7 is 55 mm, and the refractory material filled inside is 1-5 mm raw olive sand particles. Example 2

[0036] This embodiment is different from Embodiment 1 in the following two aspects, specifically:

[0037] The thickness of the bottom working lining 8 is 60 mm and is a magnesium spray coating.

[0038] The thickness of the air-permeable interlayer lining 7 is 60 mm, and the refractory material filled inside is sintered spinel particles with a diameter of 1 to 3 mm.

[0039] The microporous structure lining of the utility model can conduct heat to the back side of the working lining, which is beneficial to the transmission and dissipation of heat, reduces the overall bearing temperature of the working lining, and provides greater support for the improvement of the service life of the working lining; secondly, the diffuse microporous structure and high strength performance of the working lining can also absorb inclusions in the molten steel to a certain extent, reduce adverse inclusions in the molten steel, play a role in purifying the molten steel, improve the quality of the molten steel, and extend the working life of the tundish working lining.

[0040] 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. A continuous casting tundish with a microporous air-permeable structure, comprising a steel shell (1) and a tundish base brick (2) that cooperate with each other, characterized in that: A safety lining (3) is connected to the steel shell (1), the inner surface of the safety lining (3) includes a bottom surface (4) and a side inclined surface (5) connected to each other, a working lining (6) is connected to the side inclined surface (5), and a breathable interlayer lining (7) is provided between the working lining (6) and the safety lining (3); The base brick (2) is embedded in the bottom surface (4), and the bottom surface (4) is connected with a base working lining (8), and the base working lining (8) is tightly connected to the working lining (6); The steel shell (1), the safety lining (3), the working lining (6), the breathable interlayer lining (7), the ladle bottom working lining (8) and the ladle base bricks (2) are interlocked to form an intermediate ladle lining structure with a multi-layer microporous structure.

2. The continuous casting tundish with a microporous breathable structure according to claim 1, characterized in that: The safety lining (3) is a porous lightweight heat-insulating structure. Stainless steel steel anchor nails are fixed to the inner side of the steel shell (1). The steel shell (1) is connected to the safety lining (3) as a whole via the steel anchor nails.

3. The continuous casting tundish with a microporous breathable structure according to claim 2, characterized in that: The main material of the safety lining (3) is silica sol combined with mullite castable material, with a thickness of 130-180 mm and a compressive strength of >50 MPa.

4. The continuous casting tundish with a microporous breathable structure according to any one of claims 1 to 3, characterized in that: The working lining (6) is a flat prefabricated brick with a diffuse microporous structure throughout the whole body, which is formed into a circle on the side inclined surface (5) through a splicing combination mode to form a side-enclosed working lining.

5. The continuous casting tundish with a microporous breathable structure according to claim 4, characterized in that: The open porosity of the working lining (6) is 20% to 30%, and the pores are relatively continuous. Its compressive strength is ≥45 MPa, and its thickness is 40 to 80 mm.

6. The continuous casting tundish with a microporous breathable structure according to claim 5, characterized in that: The bottom ladle working lining (8) is a magnesium coating material, a spray coating material or a dry ramming material, and has a thickness of 60 mm to 120 mm.

7. The continuous casting tundish with a microporous breathable structure according to claim 6, characterized in that: A groove (9) is provided on the outer side below the flat precast brick of the working lining (6), and the refractory material used for the bottom-wrapped working lining (8) is embedded in the groove (9) and combined with the flat precast brick of the working lining (6) to form a completely closed upper open structure.

8. The continuous casting tundish with a microporous breathable structure according to any one of claims 1 to 3, characterized in that: The air-permeable interlayer lining (7) is a non-dense structural layer filled with coarse granular material, and has a thickness of 20 to 60 mm.

9. The continuous casting tundish with a microporous breathable structure according to claim 8, characterized in that: The air-permeable interlayer lining (7) is a refractory raw material granular material with relatively high refractoriness, and its particle size is between 0.5 and 5 mm.

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