CN213257089U

CN213257089U - Multifunctional continuous casting tundish upper nozzle

Info

Publication number: CN213257089U
Application number: CN202021683920.5U
Authority: CN
Inventors: 汪洪峰; 平玉; 李哲
Original assignee: Hegang Leting Steel Co Ltd
Current assignee: Hegang Leting Steel Co Ltd
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-05-25
Anticipated expiration: 2030-08-13

Abstract

The utility model relates to a multi-functional continuous casting tundish upper nozzle, which belongs to the technical field of continuous casting equipment in metallurgical industry. The technical scheme is as follows: the tundish upper nozzle is formed by pouring refractory materials with poor air permeability, a pouring hole (6) of the tundish upper nozzle comprises three sections from top to bottom, namely an A section, a B section and a C section, wherein the A section is in a conical shape with a large top and a small bottom, the B section is in a conical shape with a small top and a large bottom, the C section is in a cylindrical shape, an arc transition is adopted between the A section and the B section, and the inner wall of the B section is in a step shape from top to bottom; the upper part of the section C is embedded with a refractory material with better air permeability, and the outer surface of the refractory material with poorer air permeability corresponding to the section C is provided with a steel wire mesh (3); a circle of argon gas circulation groove (5) is arranged at the bottom of the tundish water feeding port around the pouring hole (6). The utility model has the advantages that: the method can slow down the bias flow of the steel flow and the water gap blockage, prevent the secondary oxidation of the molten steel and realize long-time continuous casting.

Description

Multifunctional continuous casting tundish upper nozzle

Technical Field

The utility model relates to a multi-functional continuous casting tundish upper nozzle, which belongs to the technical field of continuous casting equipment in metallurgical industry.

Background

Continuous casting is essentially a continuous process in which molten metal is poured into a mold to form a solidified shell of a given strength and the cast strand is drawn off. Firstly, the nozzle blockage increases the operation frequency of replacing the nozzle or the tundish, even stops casting, so that the productivity is reduced and the production cost is increased; secondly, the nozzle blockage can directly cause various quality problems, such as the nozzle blockage changes the flow mode of molten steel in a nozzle and the injection characteristic of an outlet, which can destroy the normal flow field in the crystallizer or cause the liquid level fluctuation of the crystallizer; various inclusions and gases are entrained in the molten steel, resulting in quality defects of steel products.

To solve the above problems, the nozzle clogging is reduced and prevented by blowing an inert gas-argon gas into a tundish nozzle, a tundish stopper or a tundish submerged nozzle. The flow and back pressure of the blown argon must be stable to achieve better effect, otherwise Al2O3 in the molten steel is deposited to block a water gap, even negative pressure is formed to suck air to cause secondary oxidation of the molten steel, and the advanced final pouring or the product quality is deteriorated.

The existing tundish water feeding port is made of a breathable refractory material, the upper refractory material is fast eroded, so that the argon flow and the back pressure are unstable, the service life is short, the water feeding port is fast blocked, the molten steel is turbulent and deflected, and the product quality and the production stability are seriously influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a multi-functional continuous casting tundish water feeding inlet can slow down the bias flow and the mouth of a river jam of steel stream, prevents molten steel secondary oxidation, can realize long-time continuous casting, solves the problem that exists among the background art.

The technical scheme of the utility model is that:

a multifunctional continuous casting tundish water feeding port is formed by pouring refractory materials with poor air permeability, a pouring hole of the tundish water feeding port comprises three sections from top to bottom, namely an A section, a B section and a C section, wherein the A section is in a conical shape with a large top and a small bottom, the B section is in a conical shape with a small top and a large bottom, the C section is in a cylindrical shape, arc transition is adopted between the A section and the B section, and the inner wall of the B section is in a step shape from top to bottom; the upper part of the section C is embedded with a refractory material with better air permeability, and the outer surface of the refractory material with poorer air permeability corresponding to the section C is provided with a steel wire mesh; a circle of argon gas flow through grooves 5 are arranged at the bottom of the tundish water feeding port around the pouring hole.

The step width of the upper part of the inner wall of the section B is smaller than that of the lower part.

The steel wire mesh is formed by weaving steel wires in a cross shape.

The steel wire mesh is coated with a heat insulation layer.

The utility model has the advantages that:

(1) the refractory material with poor air permeability has high density, high strength and melting loss resistance, so that the refractory material with good air permeability can be well protected, the continuous casting pouring time is prolonged, and the stability of steel flow is ensured;

(2) the steel wire mesh is wrapped outside the refractory material of the tundish water feeding port, so that the strength of the water feeding port can be improved, and the service life of the water feeding port is prolonged;

(3) the inner wall of the section B of the pouring hole of the upper nozzle is made into a step shape, so that the influence of the plug of the upper nozzle on the flow control of the stopper rod is reduced, the stability of the steel flow is ensured, and the bias flow of the steel water is controlled; reducing the sharp change of the shape of the molten steel flow and controlling the turbulent flow of the molten steel;

(4) an argon flow through groove is additionally formed in the lower surface of the bottom of the tundish upper nozzle, so that air is prevented from being sucked into steel flow, secondary oxidation of the steel is prevented, and nozzle blockage is prevented.

Drawings

FIG. 1 is a cross-sectional view of a top nozzle;

FIG. 2 is a top view of the water supply port;

FIG. 3 is a schematic view of an argon gas flow through groove in the lower surface of the bottom of the upper nozzle;

in the figure: 1-refractory material with poor air permeability, 2-refractory material with good air permeability, 3-steel wire mesh, 4-steps, 5-argon gas circulation groove and 6-pouring hole.

Detailed Description

The invention will be further explained by way of example with reference to the accompanying drawings.

Referring to the attached drawings 1-3, a multifunctional continuous casting tundish water feeding port is formed by pouring refractory materials with poor air permeability, a pouring hole 6 of the tundish water feeding port comprises three sections from top to bottom, namely an A section, a B section and a C section, wherein the A section is in a conical shape with a large top and a small bottom, the B section is in a conical shape with a small top and a large bottom, the C section is in a cylindrical shape, an arc transition is adopted between the A section and the B section, and the inner wall of the B section is in a step shape from top to bottom; the upper part of the section C is embedded with a refractory material with better air permeability, and the outer surface of the refractory material with poorer air permeability corresponding to the section C is provided with a steel wire mesh 3; a circle of argon gas flow through grooves 5 are arranged at the bottom of the tundish water feeding port around the pouring hole 6.

In this example, with reference to figures 1-3, the gas permeable refractory material 2: the air permeable dispersive material with relatively large air permeable dispersibility is selected, the apparent porosity is less than 20 percent, the average pore diameter of pores is less than or equal to 20 mu m, and the pore diameter distribution is uniform.

The less permeable refractory material 1 has a relatively low permeability dispersion relative to the gas permeable refractory material 2.

The position of embedding the refractory material 2 with better air permeability is arranged at the upper end of the section C, and the distance from the top of the water feeding port is more than or equal to 30 mm. The purpose of embedding the refractory material 2 with better air permeability is to ensure that argon blown into the upper nozzle is easier to escape into the nozzle from the part of the air permeable material and form a uniform and stable air curtain along the inner wall of the nozzle, thereby playing the role of effectively slowing down the nozzle blockage and the bias flow of molten steel.

The steel wire mesh 3 is formed by weaving steel wires in a cross shape, the steel wire mesh 3 only wraps the refractory material 2 with better air permeability of the water feeding port and the corresponding outer surface of the lower part of the refractory material instead of wrapping the whole water feeding port, and as shown in the attached drawing 1, a heat insulation layer of 1-2 mm is coated on the outer layer of the steel wire mesh 3. The purpose of setting up wire net 3 is to protect tundish upper nozzle refractory material better, the extension mouth of a river life-span, and the purpose of adopting the wire net rather than adopting the box hat is also when guaranteeing intensity, is favorable to the heat dissipation.

The section A of the pouring hole 6 is in a bowl mouth shape with a large upper part and a small lower part, the section B is in a cone shape with a small upper part and a large lower part, and arc transition is adopted between the section A and the section B.

The step thickness of the step 4 on the inner wall of the section B is 2mm, the step comprises a small step and a large step, wherein the width of the small step is 1mm, the width of the large step is 3mm, the small step is positioned below the wrist opening of the water feeding port, and the large step is close to the joint of the section B and the section C. The step 4 is arranged on the inner wall of the section B, and aims to reduce the influence of a plug accumulated at the upper nozzle on the flow control of the stopper, ensure the stability of the molten steel flow, control the bias flow of the molten steel, reduce the rapid change of the shape of the molten steel flow and control the turbulent flow of the molten steel.

Referring to the attached figure 3, a circle of argon flow through grooves 5 are formed in the bottom of a tundish upper nozzle surrounding a pouring hole 6 to form an argon sealing ring, argon enters the argon sealing ring to form annular positive pressure around a steel flow, so that air is prevented from being sucked into the steel flow, secondary oxidation of molten steel is prevented, and the nozzle is prevented from being blocked.

Claims

1. The utility model provides a mouth of a river on multi-functional continuous casting pouring basket which characterized in that: the tundish upper nozzle is formed by pouring refractory materials with poor air permeability, a pouring hole (6) of the tundish upper nozzle comprises three sections from top to bottom, namely an A section, a B section and a C section, wherein the A section is in a conical shape with a large top and a small bottom, the B section is in a conical shape with a small top and a large bottom, the C section is in a cylindrical shape, an arc transition is adopted between the A section and the B section, and the inner wall of the B section is in a step shape from top to bottom; the upper part of the section C is embedded with a refractory material with better air permeability, and the outer surface of the refractory material with poorer air permeability corresponding to the section C is provided with a steel wire mesh (3); a circle of argon gas circulation groove (5) is arranged at the bottom of the tundish water feeding port around the pouring hole (6).

2. The multifunctional continuous casting tundish upper nozzle according to claim 1, wherein: the step width of the upper part of the inner wall of the section B is smaller than that of the lower part.

3. The multifunctional continuous casting tundish upper nozzle according to claim 1, wherein: the steel wire mesh (3) is formed by weaving steel wires in a cross shape.

4. A multifunctional continuous casting tundish upper nozzle according to claim 1 or 3, wherein: the steel wire mesh (3) is coated with a heat insulation layer.