Tundish upper nozzle with inter-plate structure

Abstract

The utility model discloses a tundish upper nozzle with an inter-plate structure, which comprises a nozzle body (1) and an inter-plate (2) which are both made of aluminum carbon, and is characterized in that a transition layer (3) is arranged between the nozzle body (1) and the inter-plate (2), and the thermal expansion coefficient of the transition layer (3) is 3.35 * 10 <-6 > / DEG C to 6.58 * 10 <-6 > / DEG C. According to the tundish upper nozzle, the transition layer is arranged between the nozzle body and the plate, cracks generated at the joint due to the fact that the difference of thermal expansion coefficients at the joint of the nozzle body and the plate is large are avoided, it is guaranteed that cracking and steel penetration and seepage are avoided in the using process, and the reliability and the service life of the tundish upper nozzle are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel continuous casting, in particular to a tundish upper water inlet with an inter-plate structure. Background Art

[0002] The structure of the water inlet of the tundish is as follows: Figure 1 As shown, it includes a nozzle body 1 and a plate space 2. The nozzle body 1 is made of an aluminum carbon material composed of brown corundum and graphite. Compared with magnesium carbon materials and zirconium carbon materials, the aluminum carbon material composed of brown corundum and graphite has low cost and high strength; the plate space 2 is made of an aluminum carbon material composed of plate-shaped corundum and graphite. The plate-shaped corundum used in the plate space 2 is to enhance the thermal shock stability and wear resistance of the material in the plate space. Sintered plate-shaped corundum has a unique plate-shaped crystal structure, α-Al 2 O 3 The crystals are well developed and coarse. Compared with brown corundum, it has a lower thermal expansion coefficient and better thermal shock resistance.

[0003] However, in practical applications, the thermal expansion coefficient of the nozzle body 1 is in the range of 7.12*10 -6 / ℃~7.85*10 -6 / ℃, the thermal expansion coefficient range of the board 2 is 1.37*10 -6 / ℃~2.42*10 -6 / ℃, the difference in thermal expansion coefficients between the two is quite large. During use, cracks are generated at the joint of the nozzle body 1 and the plate 2 due to rapid heating and cooling, and even cracking and falling off occurs, resulting in the product penetrating the steel. Utility Model Content

[0004] The utility model aims to solve the problems existing in the prior art and provide a tundish upper water inlet with an inter-plate structure. The tundish upper water inlet is arranged through a transition layer, which can significantly improve the stability in use.

[0005] The purpose of the utility model is solved by the following technical solutions:

[0006] A tundish upper nozzle with a plate-interlayer structure, comprising a nozzle body and a plate-interlayer both made of aluminum and carbon, characterized in that a transition layer is provided between the nozzle body and the plate-interlayer, and the thermal expansion coefficient of the transition layer is 3.35*10 -6 / ℃~6.58*10 -6 / ℃.

[0007] The thickness of the transition layer is 12 mm to 20 mm.

[0008] The thickness of the transition layer is 15 mm to 18 mm.

[0009] The material of the transition layer includes the material of the nozzle body and the material between the plates.

[0010] The thickness of the transition layer is 55% to 73% of the thickness between the plates.

[0011] The transition layer is a single-layer structure or a multi-layer structure.

[0012] When the transition layer is a single-layer structure, the thermal expansion coefficient of the transition layer is 4.35*10 -6 / ℃~5.24*10 -6 / ℃.

[0013] The thermal expansion coefficient of the transition layer is 4.57*10 -6 / ℃~4.98*10 -6 / ℃.

[0014] When the transition layer is a multi-layer structure, the thermal expansion coefficient of the transition layer close to the inter-plate portion is 3.35*10 -6 / ℃~4.42*10 -6 / ℃, the thermal expansion coefficient of the transition layer close to the nozzle body is 4.98*10 -6 / ℃~6.58*10 -6 / ℃.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The utility model arranges a transition layer between the nozzle body and the plate, thereby avoiding cracks at the joint due to a large difference in thermal expansion coefficients between the two, ensuring no cracking and no steel penetration during use, and effectively improving the reliability and life of the tundish nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic diagram of the structure of the tundish upper water inlet in the prior art;

[0018] Attached Figure 2 The utility model is a schematic structural diagram of a tundish upper water inlet with an inter-plate structure.

[0019] Among them: 1—the nozzle body; 2—between the plates; 3—the transition layer. Implementation

[0020] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0021] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0022] Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the utility model.

[0023] In the description of the utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figure 2 As shown: a tundish upper nozzle with a plate-interlayer structure, comprising a nozzle body 1 and a plate-interlayer 2 both made of aluminum and carbon, a transition layer 3 with a thickness of 12 mm to 20 mm is arranged between the nozzle body 1 and the plate-interlayer 2, and the thermal expansion coefficient of the transition layer 3 is 3.35*10 -6 / ℃~6.58*10 -6 / ℃ and the thickness of the transition layer 3 is 55% to 73% of the thickness of the plate 2. Since the material of the nozzle body 1 is an aluminum-carbon material composed of brown corundum and graphite, and the material of the plate 2 is an aluminum-carbon material composed of plate-shaped corundum and graphite, in order to have similar properties, the material of the transition layer 3 is brown corundum, plate-shaped corundum and graphite, that is, the material of the transition layer 3 includes the material of the nozzle body 1 and the material of the plate 2.

[0026] In the above structure, the transition layer 3 is a single-layer structure or a multi-layer structure. When the transition layer 3 is a single-layer structure, the thermal expansion coefficient of the transition layer 3 is 4.35*10-6 / ℃~5.24*10 -6 / ℃, the thermal expansion coefficient of the transition layer 3 is preferably 4.57*10 -6 / ℃~4.98*10 -6 / ℃; when the transition layer 3 is a multi-layer structure, the thermal expansion coefficient of the transition layer 3 close to the plate 2 is 3.35*10 -6 / ℃~4.42*10 -6 / ℃, the thermal expansion coefficient of the transition layer 3 close to the nozzle body 1 is 4.98*10 -6 / ℃~6.58*10 -6 / ℃. Example

[0027] like Figure 2 The tundish upper nozzle with a plate-interlayer structure provided in the figure comprises a nozzle body 1 and a plate-interlayer 2 both made of aluminum carbon. The thermal expansion coefficient of the nozzle body 1 is about 7.49*10 -6 / ℃, the thermal expansion coefficient of the plate 2 is about 1.92*10 -6 / ℃, the difference in thermal expansion coefficients between the two is large. A single-layer transition layer 3 with a thickness of 15 mm is arranged between the nozzle body 1 and the plate space 2. The thermal expansion coefficient of the transition layer 3 is 4.72*10 -6 / ℃ and the thickness of the transition layer 3 is 60% of the thickness of the plate 2. Since the material of the nozzle body 1 is an aluminum-carbon material composed of brown corundum and graphite, and the material of the plate 2 is an aluminum-carbon material composed of plate-shaped corundum and graphite, in order to have similar properties, the material of the transition layer 3 is brown corundum, plate-shaped corundum and graphite, that is, the material of the transition layer 3 includes the material of the nozzle body 1 and the material of the plate 2.

[0028] The transition layer 3 can effectively avoid the large difference in thermal expansion coefficients between the nozzle body 1 and the plate space 2, and the cracking and falling off caused by rapid heating and cooling during use, ensuring that the plate space 2 of the upper nozzle of the tundish will not crack and fall off during use, causing the product to penetrate the steel, thereby significantly improving the reliability of the upper nozzle of the tundish.

[0029] The utility model arranges a transition layer 3 between the nozzle body 1 and the plate 2, thereby avoiding cracks at the joint due to a large difference in thermal expansion coefficients between the two, ensuring that there is no cracking and no steel penetration during use, and effectively improving the reliability and life of the tundish nozzle.

[0030] The above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them; although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the utility model. The technologies not involved in the utility model can be implemented by existing technologies.

Claims

1. A tundish upper nozzle with a plate-interlayer structure, comprising a nozzle body (1) and a plate-interlayer (2) both made of aluminum and carbon, characterized in that: A transition layer (3) is provided between the nozzle body (1) and the plate space (2), and the thermal expansion coefficient of the transition layer (3) is 3.35*10 -6 / ℃~6.58*10 -6 / ℃.

2. The tundish upper water inlet with an inter-plate structure according to claim 1, characterized in that: The thickness of the transition layer (3) is 12 mm to 20 mm.

3. The tundish upper water inlet with an inter-plate structure according to claim 2, characterized in that: The thickness of the transition layer (3) is 15 mm to 18 mm.

4. The tundish upper water inlet with an inter-plate structure according to claim 1, characterized in that: The material of the transition layer (3) includes the material of the nozzle body (1) and the material of the plate space (2).

5. The tundish upper water inlet with an inter-plate structure according to claim 1, characterized in that: The thickness of the transition layer (3) is 55% to 73% of the thickness of the inter-plate (2).

6. The tundish upper nozzle with an inter-plate structure according to any one of claims 1 to 5, characterized in that: The transition layer (3) is a single-layer structure or a multi-layer structure.

7. The tundish upper water inlet with an inter-plate structure according to claim 6, characterized in that: When the transition layer (3) is a single-layer structure, the thermal expansion coefficient of the transition layer (3) is 4.35*10 -6 / ℃~5.24*10 -6 / ℃.

8. The tundish upper water inlet with an inter-plate structure according to claim 7, characterized in that: The thermal expansion coefficient of the transition layer (3) is 4.57*10 -6 / ℃~4.98*10 -6 / ℃.

9. The tundish upper water inlet with an inter-plate structure according to claim 6, characterized in that: When the transition layer (3) is a multi-layer structure, the thermal expansion coefficient of the transition layer (3) close to the plate space (2) is 3.35*10 -6 / ℃~4.42*10 -6 / ℃, the thermal expansion coefficient of the transition layer (3) close to the nozzle body (1) is 4.98*10 -6 / ℃~6.58*10 -6 / ℃.

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