Long nozzle for pouring high-performance steel grade

Abstract

The utility model discloses a long nozzle for pouring high-performance steel, which comprises a nozzle body (1) and a bowl part (2), a bowl part lining (3) is embedded on the inner wall of the bowl part (2), and the bowl part lining (3) is positioned on the lower part of the inner wall of the bowl part (2) and extends towards the inner cavity of the nozzle body (1). According to the long nozzle, the bowl lining is embedded in the specific position of the bowl of the long nozzle, so that erosion and stripping of the bowl lining part, in contact with molten steel, of the long nozzle can be reduced to the greatest extent, and the long nozzle has excellent performances such as better thermal shock resistance, better anti-scouring performance and higher anti-stripping performance, is suitable for long-furnace-life pouring of continuous casting, and has a good application prospect. Meanwhile, a key effect is achieved on the cleanliness of the molten steel; in actual production, the long nozzle with the bowl lining is inspected after steel casting is finished for 360 minutes, cracks are not found, the surface is not obviously eroded and scoured, and the size is not obviously changed; the method is suitable for pouring ultra-low carbon steel, stainless steel and special alloy steel.

Description

Technical Field

[0001] The utility model relates to the technical field of high-performance steel casting, in particular to a long water nozzle used for casting high-performance steel. Background Art

[0002] At present, the proportion of continuous casting of steel in my country is as high as over 98%. Except for very few steel grades, most steel grades are converted into billets through continuous casting. However, for some high-performance steel grades, the selection of continuous casting functional materials in the continuous casting process has higher standards. This problem exists in the casting of ultra-low carbon steel, bearing steel, cord steel, etc. In addition to a lot of work in steelmaking and refining outside the furnace, the production process of these steels requires all refractory materials in contact with molten steel to develop towards low carbon and carbon-free, and at the same time be resistant to erosion and corrosion.

[0003] When molten steel is poured from the ladle into the tundish through the shroud, the molten steel first impacts the inner wall of the shroud bowl. The refractory material in this area must have properties such as resistance to thermal vibration and erosion. The shrouds currently produced are still some distance away from the requirements for casting this high-performance steel grade. Utility Model Content

[0004] The utility model aims to provide a long shroud for pouring high-performance steel in view of the problems existing in the existing long shroud for pouring high-performance steel.

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

[0006] A long nozzle for casting high-performance steel comprises a nozzle body and a bowl, characterized in that a bowl liner is embedded on the inner wall of the bowl, the bowl liner is located at the lower part of the inner wall of the bowl and extends to the inner cavity of the nozzle body.

[0007] The bowl lining comprises a hollow frustum portion and a cylinder portion, wherein the frustum portion is located at the lower portion of the inclined inner portion of the bowl portion and the lower edge of the frustum portion is integrally connected with the upper edge of the cylinder portion.

[0008] The inner wall of the frustum portion and the inner wall of the bowl portion are located on the same inclined plane.

[0009] The inner wall of the cylindrical portion is flush with the inner wall of the nozzle body.

[0010] The axial height of the cylindrical portion is greater than the axial height of the frustum portion.

[0011] The bowl lining is integrally formed.

[0012] The overall wall thickness of the bowl liner is consistent.

[0013] The wall thickness of the nozzle body is 4 to 6 times the wall thickness of the bowl lining.

[0014] The bowl lining is made of corundum with a purity exceeding 99%.

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

[0016] The utility model embeds a bowl lining at a specific position of the bowl of the long shroud, so that the bowl lining portion of the long shroud in contact with the molten steel can reduce erosion and spalling to the greatest extent, has excellent properties such as good thermal vibration resistance, good scouring resistance, and high spalling resistance, is suitable for long furnace life pouring of continuous casting, and plays a key role in the cleanliness of molten steel; in actual production, the long shroud with the bowl lining was inspected after 360 minutes of steel pouring, and no cracks were found, no obvious erosion and scouring on the surface, and no obvious change in size; it is suitable for pouring of ultra-low carbon steel, stainless steel, and special alloy steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 A schematic diagram of the structure of a long nozzle for pouring high-performance steel provided by the utility model;

[0018] Attached Figure 2 This is a schematic structural diagram of the bowl lining provided by the utility model.

[0019] Among them: 1 - nozzle body; 2 - bowl; 3 - bowl lining; 31 - cone; 32 - cylinder. 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 1-2 As shown: A long shroud for casting high-performance steel, comprising a shroud body 1 and a bowl 2, a bowl lining 3 is embedded on the inner wall of the bowl 2, the bowl lining 3 is located at the lower part of the inner wall of the bowl 2 and extends to the inner cavity of the shroud body 1; the bowl lining 3 is made of corundum with a purity exceeding 99% and is integrally formed, and the overall wall thickness of the bowl lining 3 is consistent, and the wall thickness of the shroud body 1 is 4 to 6 times the wall thickness of the bowl lining 3.

[0026] In the above structure, the bowl lining 3 includes a hollow conical portion 31 and a cylindrical portion 32, the conical portion 31 is located at the lower part of the inclined inner part of the bowl 2 and the lower edge of the conical portion 31 is integrally connected with the upper edge of the cylindrical portion 32, the inner wall of the conical portion 31 and the inner wall of the bowl 2 are located on the same inclined plane, and the inner wall of the cylindrical portion 32 is flush with the inner wall of the nozzle body 1; in addition, since the molten steel impacts the conical portion 31 and the cylindrical portion 32 when pouring steel, and the molten steel impacting the conical portion 31 will also pass downward through the cylindrical portion 32, in order to improve performance, the axial height of the cylindrical portion 32 is greater than the axial height of the conical portion 31.

[0027] When the long shroud for casting high-performance steel provided by the utility model is used in actual production, the long shroud 1 with the bowl lining 3 is inspected after 360 minutes of steel casting, and no cracks are found, no obvious erosion and scouring on the surface, and no obvious change in size.

[0028] The utility model embeds a bowl lining 3 at a specific position of the bowl 2 of the long shroud, so that the portion of the bowl lining 3 of the long shroud in contact with the molten steel can reduce erosion and peeling to the greatest extent, has excellent properties such as good thermal vibration resistance, good erosion resistance, and high peeling resistance, is suitable for long furnace life pouring of continuous casting, and plays a key role in the cleanliness of molten steel; and is suitable for pouring of ultra-low carbon steel, stainless steel, and special alloy steel.

[0029] 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 long nozzle for casting high-performance steel, comprising a nozzle body (1) and a bowl (2), characterized in that: A bowl lining (3) is embedded on the inner wall of the bowl (2), and the bowl lining (3) is located at the lower part of the inner wall of the bowl (2) and extends towards the inner cavity of the nozzle body (1).

2. The long shroud for pouring high-performance steel according to claim 1, characterized in that: The bowl lining (3) comprises a hollow conical portion (31) and a cylindrical portion (32); the conical portion (31) is located at the lower portion of the inclined interior of the bowl (2), and the lower edge of the conical portion (31) is integrally connected to the upper edge of the cylindrical portion (32).

3. The long shroud for pouring high-performance steel according to claim 2, characterized in that: The inner wall of the frustum portion (31) and the inner wall of the bowl portion (2) are located on the same inclined plane.

4. The long shroud for pouring high-performance steel according to claim 2, characterized in that: The inner wall of the cylindrical portion (32) is flush with the inner wall of the nozzle body (1).

5. The long shroud for pouring high-performance steel according to claim 2, characterized in that: The axial height of the cylindrical portion (32) is greater than the axial height of the frustum portion (31).

6. The long shroud for pouring high-performance steel according to claim 1, characterized in that: The bowl lining (3) is integrally formed.

7. The long shroud for pouring high-performance steel according to claim 1, characterized in that: The overall wall thickness of the bowl lining (3) is consistent.

8. The long shroud for pouring high-performance steel according to claim 1 or 7, characterized in that: The wall thickness of the nozzle body (1) is 4 to 6 times the wall thickness of the bowl lining (3).

9. The long shroud for pouring high-performance steel according to any one of claims 1 to 7, characterized in that: The bowl lining (3) is made of corundum with a purity exceeding 99%.

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