CN216989847U

CN216989847U - Continuous casting three-piece for high-oxygen enamel steel

Info

Publication number: CN216989847U
Application number: CN202220618868.8U
Authority: CN
Inventors: 杭文明; 王远林
Original assignee: Wuxi Nanfang Refractories Co ltd
Current assignee: Wuxi Nanfang Refractories Co ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-07-19
Anticipated expiration: 2032-03-21

Abstract

The utility model discloses three continuous casting parts for high-oxygen enameled steel, which comprise a stopper rod, a tundish upper nozzle and an immersion long nozzle, wherein the tundish upper nozzle is connected with the stopper rod and the immersion long nozzle, the immersion long nozzle comprises an upper bowl opening section, a connecting section, a slag line section and a nozzle section, the bottom of the upper bowl opening section is sequentially provided with the connecting section, the slag line section and the nozzle section, the upper bowl opening section is provided with a blowing assembly, the centers of the upper bowl opening section and the connecting section are provided with a first channel, the centers of the slag line section and the nozzle section are provided with a second channel, the first channel is communicated with the second channel, and the diameter of the second channel is larger than that of the first channel.

Description

Continuous casting three-piece for high-oxygen enamel steel

Technical Field

The utility model relates to the field of inorganic non-metallic material refractory bricks, in particular to three continuous casting pieces for high-oxygen enamel steel.

Background

The application of continuous casting three major products for certain domestic large-scale steel plants is promoted. Because the oxygen content of the high-oxygen enamel steel reaches 300PPM, the high-oxygen enamel steel can be oxidized very severely to common refractory materials, the conventional refractory materials can be used for about 60 minutes, the material erosion is serious, and the pollution to molten steel is serious, three continuous casting refractory materials suitable for the high-oxygen enamel steel are required to be developed. The technical key of the project is how to solve the problem of oxidation resistance of the continuous casting refractory, and the problem of oxidation is solved, so that the use requirement of the high-oxygen steel can be met, the application direction of oxidation resistance and corrosion resistance of the related conventional refractory is provided, the service life of the continuous casting refractory can be prolonged, and secondary pollution of molten steel, such as high-oxygen sulfur fast-cutting steel, unrefined steel and the like, caused by oxidation of graphite in the refractory can be reduced.

With the increasing improvement of living standard and the continuous improvement of science and technology of people, the application field of the high-oxygen enamel steel is continuously expanded, and the requirements of users on the quality of high-oxygen enamel steel products and the enamel characteristics of steel plates are also higher and higher. Specifically, the requirements on the properties of enamel steel such as high scale explosion resistance, easy adherence, low pinhole defect and the like, and the mechanical forming properties such as ultra-deep drawing, high strength, large breadth, low sintering deformation and the like are continuously improved. However, there are often complex conflicts between these product characteristics. For example, increased strength increases the risk of pin holes; the increase of the breadth of the product is easy to generate enamel steel burning deformation.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model aims to provide three continuous casting pieces for high-oxygen enamel steel, which have the advantages of good thermal stability, good erosion resistance and improved erosion resistance and oxidation resistance.

According to one aspect of the utility model, three continuous casting parts for high-oxygen enamel steel are provided, which comprise a stopper rod, a tundish upper nozzle and an immersed long nozzle, wherein the tundish upper nozzle is connected with the stopper rod and the immersed long nozzle, the immersed long nozzle comprises an upper bowl opening section, a connecting section, a slag line section and a nozzle section, the connecting section, the slag line section and the nozzle section are sequentially arranged at the bottom of the upper bowl opening section, a blowing assembly is arranged on the upper bowl opening section, a first channel is arranged at the center of the upper bowl opening section and the connecting section, a second channel is arranged at the center of the slag line section and the nozzle section, the first channel is communicated with the second channel, and the diameter of the second channel is larger than that of the first channel.

In some embodiments, the inner walls of the first channel and the second channel are coated with a high-temperature anti-sticking coating layer, the high-temperature anti-sticking coating layer is made of alumina hollow spheres, and the thickness of the high-temperature anti-sticking coating layer is 1 mm-4 mm.

In some embodiments, the upper bowl section and the outer wall of the blow assembly are clad with an iron shell.

In some embodiments, the outer wall of the connecting section is coated with a high-temperature resistant fiber cotton layer, the high-temperature resistant fiber cotton layer is made of ceramic fiber cotton, and the thickness of the high-temperature resistant fiber cotton layer is 2 mm-5 mm.

In some embodiments, the two ends of the slag line segment are connected to the connection end and the water port segment by zirconium rings.

In some embodiments, the slag line section is made of a magnesium aluminate spinel composite material.

In some embodiments, the stopper rod includes a body and a tip portion, the tip portion being made of a low carbon material.

In some embodiments, the outer walls of the stopper rod, the tundish upper nozzle and the submerged long nozzle are all provided with high-temperature glaze layers.

Compared with the prior art, the utility model has the advantages of good thermal stability, good erosion resistance and improved erosion resistance and oxidation resistance; the high-temperature anti-sticking coating layer is arranged and the alumina hollow ball material is adopted, so that the thermal conductivity can be effectively reduced, and the thermal stability of the product is improved; the iron shell component is utilized to prolong the service life conveniently; the magnesium aluminate spinel composite material has thermal stability and erosion resistance, and is compounded into three major products, so that the erosion resistance and the oxidation resistance are improved; the oxidation resistance of the refractory material is improved by utilizing the high-temperature glaze layer which is compounded with SiO2 as the main component in the traditional low-temperature glaze layer.

Drawings

FIG. 1 is a schematic structural view of three continuous casting parts for high oxygen enamel steel according to the present invention;

FIG. 2 is a schematic structural view of a submerged long nozzle for continuous casting of three large parts for high oxygen enamel steel according to the present invention;

FIG. 3 is a schematic structural diagram of a stopper rod for continuous casting of high oxygen enamel steel according to the present invention.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and one skilled in the art can make equivalent changes or substitutions in function, method or structure based on these embodiments, and all such changes or substitutions are included in the scope of the present invention.

In describing the present invention, it is noted that unless otherwise specified and limited, terms used herein

"mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, and communications between two elements, either directly or indirectly through intervening media, as the term is defined in more detail by those skilled in the art.

As shown in fig. 1 and fig. 2, the three continuous casting components for high-oxygen enamel steel according to the present invention comprise a stopper rod 1, a tundish upper nozzle 2 and an immersion long nozzle 3, wherein the tundish upper nozzle 2 is connected with the stopper rod 1 and the immersion long nozzle 3, the immersion long nozzle 3 comprises an upper bowl mouth section 31, a connecting section 32, a slag line section 33 and a nozzle section 34, the bottom of the upper bowl mouth section 31 is sequentially provided with the connecting section 32, the slag line section 33 and the nozzle section 34, the upper bowl mouth section 31 is provided with a blowing assembly 35, the centers of the upper bowl mouth section 31 and the connecting section 32 are provided with a first channel 36, the centers of the slag line section 33 and the nozzle section 34 are provided with a second channel 37, the first channel 36 is communicated with the second channel 37, and the diameter of the second channel 37 is greater than the diameter of the first channel 36. By arranging the high-temperature anti-sticking coating layer 38 and adopting the alumina hollow ball material, the thermal conductivity can be effectively reduced, and the thermal stability of the product is improved; the use of the iron shell 39 assembly facilitates extended service life; the magnesium aluminate spinel composite material has thermal stability and erosion resistance, and is compounded into three major products, so that the erosion resistance and the oxidation resistance are improved; the oxidation resistance of the refractory material is improved by utilizing the high-temperature glaze layer 4 which is compounded with SiO2 as a main component in the traditional low-temperature glaze layer.

The inner walls of the first channel 36 and the second channel 37 are coated with a high-temperature anti-sticking coating layer 38, the high-temperature anti-sticking coating layer 38 is made of alumina hollow ball materials, and the thickness of the high-temperature anti-sticking coating layer 38 is 1 mm-4 mm. The aluminum oxide hollow ball material is adopted, so that the thermal conductivity can be effectively reduced, and the heat preservation effect and the thermal shock resistance of the product are improved. The diameter of the second passage 37 is larger than the diameter of the first passage 36 to facilitate the flow of molten steel from the nozzle section 34.

The outer walls of the upper bowl mouth section 31 and the air blowing assembly 35 are coated with an iron shell 39. The use of the iron shell 39 facilitates an extended service life, while the gap between the iron shell 39 and the upper bowl section 31 facilitates the blowing assembly 35 to blow air into the first channel 36. The argon blowing treatment of molten steel is a simple external refining method for degassing molten steel and removing non-metallic inclusion. The method has simple process, cheap equipment and obvious refining effect. The molten steel argon blowing treatment is also called molten steel inert gas blowing treatment. According to the structure (such as austenite, ferrite and the like) of the molten steel to be treated at normal temperature and the purpose of treatment, the gas to be blown into the molten steel can be argon, nitrogen, carbon monoxide, water vapor and air, or nitrogen, carbon monoxide, water vapor and air are blown into the molten steel, and then argon is blown into the molten steel.

The outer wall of the connecting section 32 is coated with a high-temperature resistant fiber cotton layer 310, the high-temperature resistant fiber cotton layer 310 is made of ceramic fiber cotton, and the thickness of the high-temperature resistant fiber cotton layer 310 is 2 mm-5 mm. The ceramic fiber cotton can work in the environment of 1500-3000 ℃, secondary oxidation of tundish injection flow is prevented through the high-temperature resistant fiber cotton layer 310, and the oxidation resistance is good. In normal processing, the thickness of the high temperature resistant fiber cotton layer 3108 is optimally 3mm, which can not only ensure the effect but also save raw materials

The two ends of the slag line segment 33 are connected with the connecting end and the nozzle segment 34 through zirconium rings 311. The connection is more stable with the zirconium ring 311.

The slag line segment 33 is made of magnesium aluminate spinel composite material. The anti-corrosion reaming is made of magnesium aluminate spinel composite material.

As shown in fig. 3, the stopper rod 1 includes a body 11 and a tip portion 12, and the tip portion 12 is made of a low carbon material to which an antioxidant inhibiting material such as Si, SiC, Al, or the like is added. The low-carbon material can effectively reduce the thermal conductivity, improve the heat preservation effect and the thermal shock resistance of the product, and the antioxidant inhibition material can prevent molten steel from being oxidized.

The outer walls of the stopper rod 1, the tundish upper nozzle 2 and the immersion long nozzle 3 are all provided with high-temperature glaze layers 4. The high-temperature glaze layer 4 is prepared by using the traditional low-temperature glaze composite SiO2 as a main component, and further has the effect of improving the oxidation resistance of the refractory material. The stopper rod 1, the tundish upper nozzle 2 and the immersed long nozzle 3 adopt large-scale graphite, so that the molten steel wetting resistance of graphite materials is effectively improved, the molten steel is difficult to enter refractory matrixes, and the oxidation damage of the molten steel is resisted.

In the specific processing, attention needs to be paid to: the length-diameter ratio of the integral stopper rod 1, the tundish upper nozzle 2 and the submerged nozzle required by continuous casting is too large, and the upper and lower density differences of products pressed by a common press are too large. When isostatic pressing is used for pressing, the pressure on a pressing surface is uniform, and the volume density of each part and the section is uniform and consistent; isostatic pressing can be carried out on pug which is difficult to press and has low bonding agent content and poor plasticity, and corundum material with high graphite content belongs to the pug; due to the lamellar structure of the graphite, the graphite is easy to delaminate and orient during double-sided pressing, so that the delamination is caused, and the delamination tendency is more obvious along with the increase of the content of the graphite, so that the delamination can be effectively avoided by adopting isostatic pressing, and the product quality is ensured.

The foregoing describes only some embodiments of the present invention and modifications and variations thereof will be apparent to those skilled in the art without departing from the spirit and scope of the utility model.

Claims

1. Three major items of continuous casting for hyperoxia enamel steel, including stopper stick, middle package mouth of a river and the long mouth of a river of immersion on, its characterized in that, stopper stick and the long mouth of a river of immersion are connected to the middle package mouth of a river, the long mouth of a river of immersion includes bowl mouth section, linkage segment, sediment line segment and mouth of a river section, the bottom of going up bowl mouth section sets gradually linkage segment, sediment line segment and mouth of a river section, it is equipped with the subassembly of blowing to go up bowl mouth section, the center of going up bowl mouth section and linkage segment is equipped with first passageway, the center of sediment line segment and mouth of a river section is equipped with the second passageway, the diameter of first passageway and second passageway intercommunication and second passageway is greater than the diameter of first passageway.

2. The continuous casting three large pieces for the high-oxygen enameled steel according to claim 1, wherein the inner walls of the first channel and the second channel are coated with high-temperature anti-bonding coating layers, the high-temperature anti-bonding coating layers are made of alumina hollow spheres, and the thickness of the high-temperature anti-bonding coating layers is 1 mm-4 mm.

3. The continuous casting three-piece for high-oxygen enameled steel according to claim 2, wherein the upper bowl section and the outer wall of the air blowing assembly are coated with an iron shell.

4. The continuous casting three major components for the high oxygen enameled steel according to claim 1, 2 or 3, wherein the outer wall of the connecting section is coated with a high temperature resistant fiber cotton layer, the high temperature resistant fiber cotton layer is made of ceramic fiber cotton, and the thickness of the high temperature resistant fiber cotton layer is 2 mm-5 mm.

5. The continuous casting three-piece for high-oxygen enameled steel according to claim 4, wherein the two ends of the slag line section are connected with the connecting end and the water gap section through zirconium rings.

6. The continuous casting three main parts for the high-oxygen enamel steel as claimed in claim 5, wherein the slag line section is made of magnesium aluminate spinel composite material.

7. The continuous casting three large pieces for the high oxygen enamel steel according to claim 1, wherein the stopper rod comprises a body and a tip part, and the tip part is made of a low carbon material.

8. The continuous casting three large pieces for the high oxygen enamel steel according to claim 7, wherein the outer walls of the stopper rod, the tundish upper nozzle and the submerged long nozzle are all provided with high temperature glaze layers.