CN216989850U - Water gap with low heat conduction and thermal shock resistance functions - Google Patents

Abstract

The utility model discloses a water gap with low heat conductivity and thermal shock resistance functions, which comprises an upper bowl mouth section, and a first connecting section, a slag line section and a second connecting section which are sequentially connected below the upper bowl mouth section, wherein the outer wall of the upper bowl mouth section is provided with an air blowing assembly, the outer wall of the upper bowl mouth section is coated with an iron shell assembly, the centers of the upper bowl mouth section, the first connecting section, the slag line section and the water gap section are provided with water outlet channels, and the inner walls of the upper bowl mouth section, the first connecting section, the slag line section and the second connecting section are provided with high-temperature anti-bonding coating layers.

Description

Water gap with low heat conduction and thermal shock resistance functions

Technical Field

The utility model relates to the field of inorganic non-metallic material refractory bricks, in particular to a water gap with low heat conductivity and thermal shock resistance.

Background

As the demand for steel quality is increasing, improvements in steel making technology and technology are needed. The external refining technology is an important refining process part in the steelmaking process, and can adjust the steel components and the temperature of molten steel. With the continuous technical innovation of the ferrous metallurgy industry, the requirements of steel enterprises on the functional nozzle are higher and higher, and the requirements of the steel enterprises on higher quality are shifted from the traditional service life to the continuous casting functional nozzle with low thermal conductivity and thermal shock resistance, including melting loss resistance, thermal shock resistance, heat insulation, low carbonization, blockage prevention and the like. This requires good thermal, erosion and mechanical properties, which are higher than those of the conventional continuous casting functional nozzle. Therefore, the technology research and development of the water gap with low thermal conductivity and thermal shock resistance continuous casting functions are very important in historical significance and practical significance.

The continuously casting functional nozzle is a key refractory product for connecting a ladle, a tundish and a crystallizer, plays a vital and irreplaceable role in a channel of molten steel in a continuous casting process, and has the following functions: secondary oxidation of molten steel is prevented; controlling the flowing state and the injection speed of the molten steel; promoting the floating of the inclusion and preventing the non-metallic inclusion of the casting powder from being involved in the molten steel. The traditional continuous casting functional water gap is not only a body but also a slag line, because the graphite content is 12% -30%, the heat conductivity is higher, when molten steel flows in the water gap, cold steel is generated or heat loss is caused, even though the developed carbon-free lining material does not contain scale graphite, the ideal heat preservation effect cannot be achieved. The carbon content of the traditional continuous casting functional nozzle body material is 18-30%, the Al2O3 content is 40-60%, and the carbon content of the slag line material is 12-25%, so that the melting loss can be generated no matter the slag line material is oxidized or corroded by molten steel.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model aims to provide the nozzle with the functions of low heat conductivity and thermal shock resistance, which has the advantages of heat conductivity reduction, good heat preservation effect, good thermal shock resistance, effective prevention of nozzle blockage and carburetion of a nozzle in a billet and long service life.

According to one aspect of the utility model, the water gap with the low-heat-conductivity and thermal shock resistance functions comprises an upper bowl opening section, and a first connecting section, a slag line section and a second connecting section which are sequentially connected below the upper bowl opening section, wherein the upper bowl opening section is provided with an outer wall provided with a blowing assembly, the outer wall of the upper bowl opening section is coated with an iron shell assembly, a water outlet channel is arranged in the centers of the upper bowl opening section, the first connecting section, the slag line section and the water gap section, and the inner walls of the upper bowl opening section, the first connecting section, the slag line section and the second connecting section are provided with high-temperature anti-bonding coating layers.

In some embodiments, the high-temperature anti-bonding coating layer is made of an alumina hollow sphere material.

In some embodiments, the high temperature anti-stick coating layer has a thickness of 1mm to 4 mm.

In some embodiments, the blowing assembly comprises a connector, a first channel, a second channel and a blowing port, the connector is communicated with the air source and the first channel, the blowing port is arranged on the inner wall of the water outlet channel, and the second channel is connected with the first channel and the blowing port.

In some embodiments, the second channels are provided with a plurality of air blowing openings, the number of the air blowing openings is consistent with that of the second channels, and the second channels are distributed in an annular array by taking the center of the water outlet channel as the center.

In some embodiments, the iron shell assembly comprises a first iron shell and a second iron shell, the first iron shell is fixed at the bottom of the upper bowl mouth section through fire clay, the second iron shell and the outer wall of the upper bowl mouth section have a gap to form a first channel, the connector is fixedly connected to the second iron shell and communicated with the first channel, the top of the upper bowl mouth section is connected with the second iron shell through the fire clay, and the top of the second iron shell is connected with the top of the first iron shell in a sealing manner.

Compared with the prior art, the utility model has the advantages of reduced thermal conductivity, good heat preservation effect, good thermal shock resistance, effective prevention of water gap blockage and water gap carburetion in steel billets and long service life; the high-temperature anti-sticking coating layer is arranged, the alumina hollow sphere is adopted, and the addition of the scale graphite is eliminated, 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 iron shell component is utilized to prolong the service life conveniently; the blowing assembly is used for blowing argon gas into molten steel more uniformly so as to melt the molten steel into slag.

Drawings

FIG. 1 is a first cross-sectional view of a nozzle of the present invention having low thermal conductivity and thermal shock resistance;

fig. 2 is a schematic structural view of the gas blowing assembly of the nozzle having low thermal conductivity and thermal shock resistance 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 those skilled in the art should understand that equivalent changes or substitutions in function, method or structure according to the embodiments are included in the scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, or interconnected between two elements, directly or indirectly through intervening media, and the specific meaning of the terms may be understood by those skilled in the art according to their specific situation.

As shown in fig. 1, the nozzle with low thermal conductivity and thermal shock resistance comprises an upper nozzle section 1, and a first connecting section 2, a slag line section 3 and a second connecting section 4 which are sequentially connected below the upper nozzle section 1, wherein the upper nozzle section 1 is provided with an outer wall provided with an air blowing assembly 5, the outer wall of the upper nozzle section 1 is coated with an iron shell assembly 6, the centers of the upper nozzle section 1, the first connecting section 2, the slag line section 3 and the nozzle section are provided with a water outlet channel 7, and the inner walls of the upper nozzle section 1, the first connecting section 2, the slag line section 3 and the second connecting section 4 are provided with a high-temperature anti-bonding coating layer 8. The high-temperature anti-bonding coating layer 8 is arranged, the alumina hollow sphere is adopted, and the addition of the scale graphite is eliminated, 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 iron shell assembly 6 is utilized to prolong the service life conveniently; the blowing assembly 5 is used for facilitating argon to be blown into the molten steel more uniformly so as to melt the molten steel into slag.

The high-temperature anti-sticking coating layer 8 is made of alumina hollow sphere materials. The aluminum oxide hollow sphere material is adopted, and the addition of flake graphite is eliminated, 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 thickness of the high-temperature anti-sticking coating layer 8 is 1 mm-4 mm. The optimal thickness of the high-temperature anti-sticking coating layer 8 is 2mm in specific implementation, and the thickness setting can ensure the effect and save raw materials.

As shown in FIG. 2, the air blowing assembly 5 comprises a connector 51, a first passage 52, a second passage 53 and an air blowing opening 54, wherein the connector 51 is communicated with an air source and the first passage 52, the air blowing opening 54 is arranged on the inner wall of the water outlet passage 7, and the second passage 53 is connected with the first passage 52 and the air blowing opening 54. 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 (austenite, ferrite, etc.) of molten steel to be treated at normal temperature and different treatment purposes, 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 first and then argon is blown into the molten steel. The connector 51 is connected with a gas source, and gas is uniformly blown into molten steel through the first channel 52, the second channel 53 and the blowing port 54.

The second channels 53 are provided with a plurality of air blowing openings 54, the number of the air blowing openings is consistent with that of the second channels 53, and the second channels 53 are distributed in an annular array by taking the center of the water outlet channel 7 as the center. The number of the second channels 53 is 8-16, and when the diameter of the water outlet channel 7 is 80-100 mm, 12 second channels 53 and air blowing ports 54 are optimally arranged, so that the air blowing is more uniform while the integral thickness is ensured.

Iron shell subassembly 6 includes first iron shell 61 and second iron shell 62, and first iron shell 61 is fixed in the bottom of last bowl mouthful section 1 through the fire clay, and second iron shell 62 has clearance formation first passageway 52 with the outer wall of last bowl mouthful section 1, connector 51 fixed connection on second iron shell 62 and with the first and passageway intercommunication, the top of going up bowl mouthful section 1 is passed through the fire clay and is connected with second iron shell 62, the top of second iron shell 62 and the top sealing connection of first iron shell 61. Since the upper bowl mouth section 1 has a step and a diagonal section, the iron shell assembly 6 needs to be installed from the upper and lower directions, respectively. When the concrete implementation is carried out, the first iron shell 61 needs to be sleeved at the bottom of the upper bowl opening section 1 from the direction of the second connecting section 4 and fixed by using fire clay for filling joints, and then the second iron shell 62 is installed from the top of the upper bowl opening section 1, so that the gap between the second iron shell 62 and the upper bowl opening section 1 should be uniform, and meanwhile, the first channel 52 should be sealed, so that the top of the first iron shell 61 and the bottom of the second iron shell 62 should be welded and fixed and the internal sealing is ensured.

The utility model adopts capacitance corundum, corundum hollow spheres, fused quartz, micro powder and a bonding agent during processing and production, wherein the weight percentage of each component is as follows: 35-45% of fused corundum, 30-40% of corundum core-containing ball, 5-15% of fused quartz, 3-15% of micro powder and 5-10% of bonding agent in total weight of the components, and granulating; drying until the volatilization in the pug is 1.0-1.5%; compounding pug in an inner cavity with a continuous casting function, and molding by using an isostatic press to obtain a wet blank, wherein the molding pressure is preferably 100-120 MPa; curing the wet blank at 175-185 ℃ for 34-38 hours, wherein the curing temperature in the research of the project is preferably 180 ℃, and the curing time is preferably 36 hours; and (3) firing the raw product at 1050-1150 ℃ for 22-26 hours, wherein the firing temperature in the project is preferably 1100 ℃, and the firing time is preferably 24 hours, so as to obtain a finished product.

The main technical indexes are as follows:

1.AL2O3(％)：≥45；

2.F·C(％)：≥20；

3.ZrO2(％)：≥70；

4. bulk density g/cm 3: not less than 12.28;

5. apparent porosity (%): less than or equal to 19;

6. normal temperature compressive strength MPa: not less than 19;

7. normal temperature rupture strength MPa: not less than 5.5.

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 (6)

1. A water gap with low thermal conductivity and thermal shock resistance functions is characterized by comprising an upper bowl opening section and a first connecting section, a slag line section and a second connecting section which are sequentially connected below the upper bowl opening section, wherein the upper bowl opening section is provided with an outer wall and a blowing assembly, the outer wall of the upper bowl opening section is coated with an iron shell assembly, a water outlet channel is arranged at the center of the upper bowl opening section, the first connecting section, the slag line section and the water gap section, and a high-temperature anti-bonding coating layer is arranged on the inner wall of the upper bowl opening section, the first connecting section, the slag line section and the second connecting section.

2. The nozzle with low thermal conductivity and thermal shock resistance as claimed in claim 1, wherein the high temperature anti-sticking coating layer is made of alumina hollow ball material.

3. The nozzle with low thermal conductivity and thermal shock resistance of claim 2, wherein the thickness of the high temperature anti-sticking coating layer is 1mm to 4 mm.

4. The nozzle with low heat conductivity and thermal shock resistance as claimed in claim 1, 2 or 3, wherein the blowing assembly comprises a connector, a first channel, a second channel and a blowing port, the connector is communicated with the air source and the first channel, the blowing port is arranged on the inner wall of the water outlet channel, and the second channel is connected with the first channel and the blowing port.

5. The nozzle with low thermal conductivity and thermal shock resistance as claimed in claim 4, wherein the number of the second channels is equal to the number of the air blowing openings, and the second channels are distributed in an annular array with the center of the water outlet channel as the center.

6. The nozzle of claim 5, wherein the iron shell assembly comprises a first iron shell and a second iron shell, the first iron shell is fixed at the bottom of the upper bowl mouth section through fire clay, the second iron shell and the outer wall of the upper bowl mouth section form a first channel with a gap, the connector is fixedly connected to the second iron shell and communicated with the first channel, the top of the upper bowl mouth section is connected with the second iron shell through fire clay, and the top of the second iron shell is hermetically connected with the top of the first iron shell.

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