CN112876264A - Application method of continuous casting machine immersion type water gap sealing material - Google Patents
Application method of continuous casting machine immersion type water gap sealing material Download PDFInfo
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- CN112876264A CN112876264A CN202110045130.7A CN202110045130A CN112876264A CN 112876264 A CN112876264 A CN 112876264A CN 202110045130 A CN202110045130 A CN 202110045130A CN 112876264 A CN112876264 A CN 112876264A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/502—Connection arrangements; Sealing means therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/425—Graphite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- Organic Chemistry (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The invention relates to a use method of a continuous casting machine immersion nozzle sealing material, which comprises the following raw materials in parts by weight: 60-80 parts of graphite and 8-16 parts of aluminum oxide; 3-9 parts of magnesium oxide; 2.5-4 parts of silicon dioxide; pulverizing graphite, aluminum oxide, magnesium oxide and silicon dioxide into powder; the using method comprises the following steps: adding water, mixing, smearing and baking. The sealing material has strong high temperature resistance and good sealing effect, can effectively prevent negative pressure suction at the parts of a stopper rod, an upper nozzle, a lower nozzle, and the like in the continuous casting process by using the sealing material for sealing, reduces the plate bubble defect formed by gas entering molten steel and being solidified and retained, prolongs the service life of a quick-change mechanism of a tundish body, increases the number of continuous casting furnaces of the tundish, improves the production operation rate, reduces the production cost, reduces the plate bubble defect waste from the original 2.1 percent to below 0.2 percent, obviously improves the rolling qualification rate of thick plates, and creates better economic benefit.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy continuous casting, in particular to a using method of a sealing material for an immersion type water gap of a continuous casting machine.
Background
Most of steel enterprise's conticaster middle package mouth of a river at present adopts the argon gas sealing mode, including middle package stopper stick blows the argon, mouth of a river argon seal about the middle package, its main function has inhibited the secondary oxidation that the air intake leads to between the mouth of a river slide plate face about the mouth of a river argon seal has blown through the mouth of a river about the middle package. However, the sealing technology has the defects that the flow of argon is not well controlled, negative pressure is formed, air is sucked, gas in molten steel moves to different parts of a certain depth of a crystallizer along with the molten steel, solidified dendritic crystals capture bubbles at a solid-liquid interface, and finally bubble defects exist on the surface of a casting blank.
The tundish nozzle is put into production for years, the tundish adopts a traditional argon control mode, and comprises a stopper rod for blowing argon and a tundish upper nozzle for blowing argon, wherein the tundish upper nozzle and the tundish lower nozzle are argon-sealed. In the technology, argon bubbles blown by the stopper rod escape from the molten steel surface of the crystallizer to activate the molten steel surface of the crystallizer, which is beneficial to improving the melting effect of the crystallizer casting powder; the argon blowing at the water feeding port is favorable for preventing the water feeding port from nodulation; the argon blowing sealing of the upper and lower water gaps inhibits the secondary oxidation caused by air suction between the surfaces of the slide plates of the upper and lower water gaps. However, the sealing mode is easy to have the problem that the control of argon flow is not good, negative pressure is formed, air is sucked, a large number of bubble defects exist on the surface of a casting blank, and the quantity of waste products judged to be waste by the bubble defects every month reaches thousands of tons. The bubble defect is generated because the gas in the molten steel moves to different parts of the crystallizer with a certain depth along with the molten steel, the solidified dendritic crystal captures the bubble at a solid-liquid interface, and the bubble is solidified along with the molten steel to form the bubble defect. Through experimental analysis, the argon blowing amount and the bubble defect have an obvious corresponding relation, and the larger the argon blowing amount is, the more serious the generated bubble defect is.
And then stopping argon blowing functions of the stopper rod and the upper water gap, namely adopting a non-porous stopper rod and a non-breathable upper water gap, causing no negative influence on production, reducing the bubble defect of the casting blank to one tenth of that before improvement, and reducing the bubble waste per month to about several hundred tons, but not further solving the problem of the bubble defect.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a sealing material for a submerged nozzle of a continuous casting machine. The sealing material has strong high temperature resistance and good sealing effect. The invention also aims to provide a method for using the submerged nozzle sealing material of the continuous casting machine. The method is convenient to operate, negative pressure air suction at the parts such as a stopper rod, an upper nozzle, a lower nozzle, quick change surfaces and the like in the continuous casting process can be effectively prevented by using the sealing material for sealing, the defect of plate bubbles formed by gas entering molten steel and being solidified and retained is reduced, the service life of a quick change mechanism of the tundish body is prolonged, the number of continuous casting furnaces of the tundish is increased, the production operation rate is improved, the production cost is reduced, the defect waste of the plate bubbles is reduced to below 0.2% from the original 2.1%, the rolling pass rate of the thick plate is obviously improved, and better economic benefit is created.
The technical purpose of the invention is realized by the following technical scheme: the use method of the submerged nozzle sealing material of the continuous casting machine comprises the following raw materials in parts by weight: 60-80 parts of graphite and 8-16 parts of aluminum oxide; 3-9 parts of magnesium oxide; 2.5-4 parts of silicon dioxide;
the graphite, the alumina, the magnesia and the silicon dioxide are all crushed into powder;
the use method of the sealing material comprises the following steps:
adding water and mixing: adding water to the sealing material and uniformly stirring to form paste;
smearing: coating the paste between the upper nozzle of the tundish and the slide plate surface of the submerged nozzle by using a coating tool;
baking: and baking the submerged nozzle after coating to ensure that the sealing material expands to form a compact layer after drying and temperature rise.
In one embodiment, the feed comprises the following raw materials in parts by weight: 70-80 parts of graphite and 12-16 parts of alumina; 5-9 parts of magnesium oxide and 2.5-4 parts of silicon dioxide.
In one embodiment, the feed comprises the following raw materials in parts by weight: 75 parts of graphite and 14 parts of alumina; 7.5 parts of magnesium oxide and 3.5 parts of silicon dioxide.
In one embodiment, in the step of adding water and mixing, the ratio of the sealing material to the water is 8: 2-9: 1.
In one embodiment, in the baking step, the baking temperature is 800 to 1000 ℃.
In one embodiment, in the baking step, the baking time is 60 to 90 minutes.
In one embodiment, in the step of applying, the paste is applied to a thickness of 1-3 mm.
In one embodiment, before the step of adding water and mixing, the method further comprises the step of transporting and storing the sealing material: weighing the raw materials according to the formula of the sealing material, and wrapping the silicon dioxide on the outer layer.
In one embodiment, the step of adding water and mixing is preceded by uniformly mixing the sealing material.
In one embodiment, in the step of coating, the coating tool is made of a high temperature and corrosion resistant material.
In conclusion, the invention has the following beneficial effects:
1. the sealing material has strong high temperature resistance and good sealing effect.
2. The method is convenient to operate, negative pressure air suction at the parts such as a stopper rod, an upper nozzle, a lower nozzle, quick change surfaces and the like in the continuous casting process can be effectively prevented by using the sealing material for sealing, the defect of plate bubbles formed by gas entering molten steel and being solidified and retained is reduced, the service life of a quick change mechanism of the tundish body is prolonged, the number of continuous casting furnaces of the tundish is increased, the production operation rate is improved, the production cost is reduced, the defect waste of the plate bubbles is reduced to below 0.2% from the original 2.1%, the rolling pass rate of the thick plate is obviously improved, and better economic benefit is created.
3. Graphite is the main component of coating for be the graphite of layering combines between immersion nozzle and the pouring basket mouth of a river, guarantee to dismantle fast. The graphite has three better performances, one is that the graphite has extremely strong high temperature resistance at high temperature; secondly, because the graphite has the layering effect, when the submerged nozzle needs to be replaced even if molten steel comes out from a gap in the production process due to the occurrence of abnormality in the continuous casting and pouring process, the submerged nozzle can be easily separated from the tundish lower nozzle due to the layering effect of the graphite, so that the convenience and the efficiency of replacing the submerged nozzle can be ensured; thirdly, the existence of graphite can also improve the thermal conductivity and reduce the fragmentation and the peeling of the coating.
4. Alumina is second only to graphite, has the ability to not easily form a liquid phase, and functions as a framework together with graphite.
5. The magnesium oxide has high melting point, and can play a role in protecting the water gap by utilizing the property that the magnesium oxide does not have chemical reaction with the refractory material of the water gap in the contact surface of the submerged water gap and the upper water gap of the tundish.
6. In order to prevent the sealing coating from being oxidized by the ingress of oxygen in the air during the transportation of the coating, the silica forms a protective film on the surface of the coating to prevent further oxidation of the coating. Meanwhile, as the thermal conductivity of the silicon dioxide is high, the thermal shock resistance is achieved in use, and the spalling resistance of the coating is improved.
Detailed Description
The present invention will be described in detail with reference to examples.
The submerged nozzle sealing material for the continuous casting machine comprises the following raw materials in parts by weight: 60-80 parts of graphite and 8-16 parts of aluminum oxide; 3-9 parts of magnesium oxide; 2.5-4 parts of silicon dioxide;
the graphite, the alumina, the magnesia and the silica are all crushed into powder.
The sealing material has strong high temperature resistance and good sealing effect, and has the following specific effects:
graphite is the main component of coating for be the graphite of layering combines between immersion nozzle and the pouring basket mouth of a river, guarantee to dismantle fast. The graphite has three better performances, one is that the graphite has extremely strong high temperature resistance at high temperature; secondly, because the graphite has the layering effect, when the submerged nozzle needs to be replaced even if molten steel comes out from a gap in the production process due to the occurrence of abnormality in the continuous casting and pouring process, the submerged nozzle can be easily separated from the tundish lower nozzle due to the layering effect of the graphite, so that the convenience and the efficiency of replacing the submerged nozzle can be ensured; thirdly, the existence of graphite can also improve the thermal conductivity and reduce the fragmentation and the peeling of the coating.
Alumina is second only to graphite, has the ability to not easily form a liquid phase, and functions as a framework together with graphite.
The magnesium oxide has high melting point, and can play a role in protecting the water gap by utilizing the property that the magnesium oxide does not have chemical reaction with the refractory material of the water gap in the contact surface of the submerged water gap and the upper water gap of the tundish.
In order to prevent the sealing coating from being oxidized by the ingress of oxygen in the air during the transportation of the coating, the silica forms a protective film on the surface of the coating to prevent further oxidation of the coating. Meanwhile, as the thermal conductivity of the silicon dioxide is high, the thermal shock resistance is achieved in use, and the spalling resistance of the coating is improved.
A use method of a sealing material for an immersion nozzle of a continuous casting machine comprises the following specific use methods:
adding water and mixing: adding water into the sealing material and uniformly stirring to form paste;
smearing: coating the paste between the upper nozzle of the tundish and the slide plate surface of the submerged nozzle by using a coating tool; the smearing tool is made of high-temperature-resistant and corrosion-resistant materials, so that the phenomenon that the smearing tool is damaged by the residual heat of a used tundish water feeding port and the possible corrosivity of the sealing material is avoided, and the phenomenon that the performance of the sealing material is influenced by the mixing of the materials on the smearing tool is avoided;
baking: after coating, the submerged nozzle is baked to make the sealing material expand after drying and raising temperature to form a compact layer. The sealing material expands after drying and temperature rise to make the space between the upper water gap and the lower water gap more compact, and can prevent the surface of the slide plate from air suction oxidation.
The method is convenient to operate, negative pressure air suction at the parts such as a stopper rod, an upper nozzle, a lower nozzle, quick change surfaces and the like in the continuous casting process can be effectively prevented by using the sealing material for sealing, the defect of plate bubbles formed by gas entering molten steel and being solidified and retained is reduced, the service life of a quick change mechanism of the tundish body is prolonged, the number of continuous casting furnaces of the tundish is increased, the production operation rate is improved, the production cost is reduced, the defect waste of the plate bubbles is reduced to below 0.2% from the original 2.1%, the rolling pass rate of the thick plate is obviously improved, and better economic benefit is created.
In one embodiment, in the step of adding water for mixing, the ratio of the sealing material to the water is 8: 2-9: 1. The proper amount of water is added to enable the sealing material to be pasty and have certain viscosity, when the sealing material is coated on the slide plate surfaces of the tundish feeding port and the submerged nozzle, the sealing material can stay at the coating position relatively, so that a compact layer is formed after baking and expansion, water is easy to evaporate during baking, and the sealing between the sealing material and the slide plate surfaces of the tundish feeding port and the submerged nozzle cannot be influenced. In the baking step, the baking temperature is 800-1000 ℃ until the coated sealing material is observed to form a compact layer. Or the baking time is set to be 60-90 minutes, if the observation in a high-temperature environment is inconvenient, a fixed time period can be set for baking, after a plurality of tests, a dense layer with good quality can be formed after the baking time is 60-90 minutes, fine adjustment in the time range can be determined according to the amount of water added during water adding and mixing and the actual baking temperature, for example, the proportion of the sealing material to the water is 8:2, and the baking time is 90 minutes at 800 ℃; the proportion of the sealing material to the water is 9:1, and the sealing material is baked for 60 minutes at the baking temperature of 1000 ℃; and so on. The baking time is proper, an expanded compact layer is formed, and meanwhile, the compact layer is prevented from generating cracks due to too long time. In the step of smearing, the smearing thickness of the paste is 1-3 mm, a layer of paste is guaranteed to be evenly smeared, and then the gap between the tundish water feeding port and the slide plate surface of the submerged nozzle is filled and sealed through expansion of the sealing material.
In one embodiment, before the step of adding water and mixing, the method further comprises the step of transporting and storing the sealing material: weighing the raw materials according to the formula of the sealing material, and wrapping the outer layer with silicon dioxide. The silica forms a protective film on the surface of the coating to prevent further oxidation of the coating and to prevent oxidation of the sealing coating due to the ingress of oxygen in the air. Before the step of adding water for mixing, the sealing material is uniformly mixed. In order to avoid adding water, the sealing material has certain viscosity, so that part of substances are easy to agglomerate in advance, and subsequent uniform mixing is influenced, therefore, the sealing material needs to be fully and uniformly mixed after being conveyed before adding water, and particularly, the silicon dioxide on the surface layer can be fully mixed into the interior.
Example 1
The submerged nozzle sealing material for the continuous casting machine comprises the following raw materials in parts by weight: 75 parts of graphite and 14 parts of alumina; 7.5 parts of magnesium oxide; 3.5 parts of silicon dioxide; the graphite, the alumina, the magnesia and the silica are all crushed into powder.
Taking the production section thickness of 220mm as an example, the application method of the submerged nozzle sealing material of the continuous casting machine comprises the following specific application methods:
preparing and installing a 220mm section tundish submerged nozzle according to a tundish baking plan of a continuous casting machine;
preparing a sealing material according to the formula, and uniformly mixing the sealing material;
adding water and mixing: adding water into the sealing material and uniformly stirring, wherein the ratio of the sealing material to the water is 9:1, and forming a paste;
smearing: coating the paste between the upper nozzle of the tundish and the slide plate surface of the submerged nozzle by using a coating tool, wherein the coating thickness is 2 mm;
baking: and baking the submerged nozzle after coating, wherein the baking temperature is 900 ℃, and the baking time is 70 minutes, so that the sealing material expands after drying and temperature rise to form a compact layer.
Example 2
The submerged nozzle sealing material for the continuous casting machine comprises the following raw materials in parts by weight: 70 parts of graphite and 12 parts of alumina; 5 parts of magnesium oxide; 2.5 parts of silicon dioxide; the graphite, the alumina, the magnesia and the silica are all crushed into powder.
Taking the production section thickness of 220mm as an example, the application method of the submerged nozzle sealing material of the continuous casting machine comprises the following specific application methods:
preparing and installing a 220mm section tundish submerged nozzle according to a tundish baking plan of a continuous casting machine;
preparing a sealing material according to the formula, and uniformly mixing the sealing material;
adding water and mixing: adding water into the sealing material and uniformly stirring, wherein the ratio of the sealing material to the water is 9:1, and forming a paste;
smearing: coating the paste between the upper nozzle of the tundish and the slide plate surface of the submerged nozzle by using a coating tool, wherein the coating thickness is 2 mm;
baking: and baking the submerged nozzle after coating, wherein the baking temperature is 900 ℃, and the baking time is 70 minutes, so that the sealing material expands after drying and temperature rise to form a compact layer.
Example 3
The submerged nozzle sealing material for the continuous casting machine comprises the following raw materials in parts by weight: 80 parts of graphite and 16 parts of alumina; 9 parts of magnesium oxide; 4 parts of silicon dioxide; the graphite, the alumina, the magnesia and the silica are all crushed into powder.
Taking the production section thickness of 220mm as an example, the application method of the submerged nozzle sealing material of the continuous casting machine comprises the following specific application methods:
preparing and installing a 220mm section tundish submerged nozzle according to a tundish baking plan of a continuous casting machine;
preparing a sealing material according to the formula, and uniformly mixing the sealing material;
adding water and mixing: adding water into the sealing material and uniformly stirring, wherein the ratio of the sealing material to the water is 9:1, and forming a paste;
smearing: coating the paste between the upper nozzle of the tundish and the slide plate surface of the submerged nozzle by using a coating tool, wherein the coating thickness is 2 mm;
baking: and baking the submerged nozzle after coating, wherein the baking temperature is 900 ℃, and the baking time is 70 minutes, so that the sealing material expands after drying and temperature rise to form a compact layer.
Example 4
The submerged nozzle sealing material for the continuous casting machine comprises the following raw materials in parts by weight: 60 parts of graphite and 8 parts of aluminum oxide; 3 parts of magnesium oxide; 3.5 parts of silicon dioxide; the graphite, the alumina, the magnesia and the silica are all crushed into powder.
Taking the production section thickness of 220mm as an example, the application method of the submerged nozzle sealing material of the continuous casting machine comprises the following specific application methods:
preparing and installing a 220mm section tundish submerged nozzle according to a tundish baking plan of a continuous casting machine;
preparing a sealing material according to the formula, and uniformly mixing the sealing material;
adding water and mixing: adding water into the sealing material and uniformly stirring, wherein the ratio of the sealing material to the water is 9:1, and forming a paste;
smearing: coating the paste between the upper nozzle of the tundish and the slide plate surface of the submerged nozzle by using a coating tool, wherein the coating thickness is 2 mm;
baking: and baking the submerged nozzle after coating, wherein the baking temperature is 900 ℃, and the baking time is 70 minutes, so that the sealing material expands after drying and temperature rise to form a compact layer.
According to the contents of the above examples 1-4, and in combination with comparative examples, the comparative examples are that the production section thickness is 220mm, the tundish nozzle is sealed by argon blowing sealing technology, and the production effects of the five embodiments are compared in a table form:
table 1 shows the formulation comparisons (in parts by weight) of the sealants used in examples 1-4
Table 2 is a comparison of the use effects of the examples and comparative examples
Therefore, the sealing material disclosed by the invention is used for sealing the slide plate surfaces of the upper nozzle and the submerged nozzle of the tundish, so that negative pressure air suction at the positions of a stopper rod, the upper nozzle, the lower nozzle quick change surface and the like in the continuous casting process can be effectively prevented, the defect of plate bubbles formed by gas entering molten steel and being solidified and retained is reduced, the service life of a quick change mechanism of the tundish body is prolonged, the number of continuous casting furnaces of the tundish is increased, the production operation rate is increased, the production cost is reduced, the standardization of submerged nozzle sealing is realized, the labor intensity of workers is reduced, the quality of a casting blank is further improved, and the defect of the casting blank bubbles caused by air suction at the nozzle is reduced.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures, and it is to be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. The use method of the submerged nozzle sealing material of the continuous casting machine is characterized in that the sealing material comprises the following raw materials in parts by weight: 60-80 parts of graphite and 8-16 parts of aluminum oxide; 3-9 parts of magnesium oxide; 2.5-4 parts of silicon dioxide;
the graphite, the alumina, the magnesia and the silicon dioxide are all crushed into powder;
the use method of the sealing material comprises the following steps:
adding water and mixing: adding water to the sealing material and uniformly stirring to form paste;
smearing: coating the paste between the upper nozzle of the tundish and the slide plate surface of the submerged nozzle by using a coating tool;
baking: and baking the submerged nozzle after coating to ensure that the sealing material expands to form a compact layer after drying and temperature rise.
2. The method for using the submerged nozzle sealing material of the continuous casting machine according to claim 1, wherein the sealing material comprises the following raw materials in parts by weight: 70-80 parts of graphite and 12-16 parts of alumina; 5-9 parts of magnesium oxide and 2.5-4 parts of silicon dioxide.
3. The method for using the submerged nozzle sealing material of the continuous casting machine according to claim 2, wherein the sealing material comprises the following raw materials in parts by weight: 75 parts of graphite and 14 parts of alumina; 7.5 parts of magnesium oxide and 3.5 parts of silicon dioxide.
4. The method for using the submerged nozzle sealing material of the continuous casting machine according to any one of claims 1 to 3, wherein in the step of adding water and mixing, the ratio of the sealing material to the water is 8:2 to 9: 1.
5. The method for using the submerged nozzle sealing material of the continuous casting machine according to claim 4, wherein in the baking step, the baking temperature is 800-1000 ℃.
6. The method for using the submerged nozzle sealing material of the continuous casting machine according to claim 5, wherein in the baking step, the baking time is 60 to 90 minutes.
7. The method for using the sealing material for the submerged nozzle of the continuous casting machine according to claim 6, wherein in the step of coating, the coating thickness of the paste is 1 to 3 mm.
8. The method for using the sealing material for the submerged nozzle of the continuous casting machine according to claim 1, further comprising the step of transporting and storing the sealing material before the step of adding water and mixing: weighing the raw materials according to the formula of the sealing material, and wrapping the silicon dioxide on the outer layer.
9. The method of using a sealing material for a submerged nozzle of a continuous casting machine according to claim 8, wherein the sealing material is uniformly mixed before the step of adding water.
10. The method for using a sealing material for a submerged nozzle of a continuous casting machine according to claim 1, wherein in the step of coating, the coating tool is made of a high temperature and corrosion resistant material.
Priority Applications (1)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1086504A (en) * | 1992-11-02 | 1994-05-11 | 重庆大学 | Sealing material for continuous casting gate and manufacturing process thereof |
| CN105016742A (en) * | 2014-04-24 | 2015-11-04 | 宝山钢铁股份有限公司 | Coating for sealing continuous casting nozzle, as well as preparation method and application of coating |
| CN108672693A (en) * | 2018-07-24 | 2018-10-19 | 鞍山市和丰耐火材料有限公司 | A kind of sealing structure and method using the submersed nozzle containing expanded graphite meterial |
| CN110922214A (en) * | 2019-12-06 | 2020-03-27 | 马鞍山钢铁股份有限公司 | Coating material for preventing submerged nozzle from nodulation and preparation method thereof |
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2021
- 2021-01-13 CN CN202110045130.7A patent/CN112876264A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1086504A (en) * | 1992-11-02 | 1994-05-11 | 重庆大学 | Sealing material for continuous casting gate and manufacturing process thereof |
| CN105016742A (en) * | 2014-04-24 | 2015-11-04 | 宝山钢铁股份有限公司 | Coating for sealing continuous casting nozzle, as well as preparation method and application of coating |
| CN108672693A (en) * | 2018-07-24 | 2018-10-19 | 鞍山市和丰耐火材料有限公司 | A kind of sealing structure and method using the submersed nozzle containing expanded graphite meterial |
| CN110922214A (en) * | 2019-12-06 | 2020-03-27 | 马鞍山钢铁股份有限公司 | Coating material for preventing submerged nozzle from nodulation and preparation method thereof |
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