CN211640344U - Novel special-shaped blank tundish turbulence controller - Google Patents
Novel special-shaped blank tundish turbulence controller Download PDFInfo
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- CN211640344U CN211640344U CN202020131251.4U CN202020131251U CN211640344U CN 211640344 U CN211640344 U CN 211640344U CN 202020131251 U CN202020131251 U CN 202020131251U CN 211640344 U CN211640344 U CN 211640344U
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Abstract
The utility model relates to the technical field of continuous casting refractory material process, in particular to a novel special-shaped blank tundish turbulence controller, which comprises a shell and a sleeve core, wherein the sleeve core is arranged in an inner cavity of the shell, the longitudinal central line of the sleeve core is coincided with the longitudinal central line of the inner cavity of the shell, a joint seam is arranged between the shell and the sleeve core, the outer part of the sleeve core is a truncated cone-shaped magnesium prefabricated part, the inner part of the sleeve core is a paraboloid-shaped inner cavity, the inner cavity is divided into the upper part of the inner cavity of the sleeve core, the lower part of the inner cavity of the sleeve core and the bottom of the inner cavity of the sleeve core, the upper part of the inner cavity of the sleeve core is a cylindrical surface, the lower part of the inner cavity of the sleeve core is an inwards concave paraboloid of revolution, the bottom of the inner cavity of the sleeve core is a circular plane, the bottom surface of the inner cavity is contacted, the service life is long.
Description
Technical Field
The utility model relates to a continuous casting refractory material technology technical field especially relates to a novel special-shaped blank tundish turbulence controller and preparation method thereof.
Background
The turbulence controller is arranged in the tundish of the continuous casting machine, so that the running route of molten steel in the tundish can be changed, the retention time is prolonged, floating removal of impurities is promoted, the important effect on improving the quality of a casting blank is achieved, meanwhile, the scouring of a ladle pouring stream on a tundish working lining impact area can be slowed down, and the continuous casting time of the tundish is prolonged. In recent years, the production technology of the turbulence controller is developed to the metallurgy functionalization, the longevity and the cost reduction, but the tundish turbulence controller produced by the prior art cannot meet the performance requirements of the metallurgy functionalization, the longevity and the cost reduction at the same time.
CN103658577B discloses a method for preparing a continuous casting tundish composite turbulence controller, the composite turbulence controller comprises a shell, a bottom plate, a sleeve core, an expansion joint and an antioxidant coating, the shell is cast by magnesium casting material, the bottom plate is built by magnesium carbon bricks which are formed by machine pressing, the sleeve core is built by fan-shaped magnesium carbon bricks which are formed by machine pressing, the expansion joint is arranged between the shell and the bottom plate and between the shell and the sleeve core, and the antioxidant coating is coated on the outer surface of the sleeve core. However, the utility model discloses an inner chamber shape is "cylinder", and it is poor to restrain the effect of ladle injection torrent turbulent energy, is unfavorable for improving the flow characteristic of interior molten steel of tundish, and the cover core adopts "fan-shaped" magnesia carbon brick to build by laying bricks or stones simultaneously, and the wholeness can be poor, easily appears taking off the brick, and the stability of quality is short of.
CN109591158A discloses a tundish current stabilizer, which is formed by integrally embedding a casing and a hollow inner cavity, wherein the shape and size of the casing are designed to be adapted to an impact area of a tundish, the center of the casing is recessed, so that the casing is in a concave shape, the casing is formed by a steel fiber aluminum-magnesium castable prefabricated member, and the steel fiber aluminum-magnesium castable prefabricated member is integrally cast and molded; the hollow inner cavity is cylindrical and is suitable for being embedded into the center of the shell, the hollow inner cavity is flush with the top of the shell, the hollow inner cavity is built by a magnesium-carbon prefabricated part, and the carbon prefabricated part is formed by isostatic pressing integral pressing; the method for manufacturing the tundish current stabilizer is characterized in that the inner cavity of the current stabilizer is improved into an integral pressing forming mode by a traditional multiple magnesia carbon brick masonry forming method, so that inner cavity brick joints which are easy to erode in the traditional current stabilizer are eliminated, the problems of steel infiltration and steel penetration of the brick joints of the inner cavity of the traditional current stabilizer are thoroughly solved, and the service life of the tundish current stabilizer is greatly prolonged. However, the preparation cost is high, and the popularization and the application are limited.
The isostatic pressing forming method is a forming method in which the pug is subjected to equal hydrostatic pressure in all directions, liquid is used as a pressure transmission medium, the pug is loaded into an elastic die, and pressure is applied in a high-pressure cylinder for forming. The isostatic pressing machine consists of a high-pressure container and a high-pressure oil pump. The high pressure vessel is made of high-grade alloy steel and has a certain thickness to withstand a great pressure. The size of the container is selected according to the size of the molded article. The liquid medium in the high-pressure container can be oil, water or glycerin, generally brake oil or anhydrous glycerin, and the compressibility of the two liquids is extremely small, so that almost all pressure can be transmitted to the elastic die.
Disclosure of Invention
An object of the utility model is to overcome prior art's not enough, provide a novel preparation method of special-shaped base continuous casting tundish turbulence controller, adopt body shell and cover core composite construction design, the cover core is based on the round platform shape prefab that has special inner chamber shape of water mould experimental study design, adopts magnesium carbon material, isostatic compaction preparation, satisfies the technical performance requirement of metallurgical functionalization and longevity simultaneously.
In order to achieve the above object, the utility model provides a following technical scheme: a novel special-shaped blank tundish turbulence controller comprises a shell and a sleeve core, wherein the sleeve core is arranged in an inner cavity of the shell, the longitudinal center line of the sleeve core is coincident with the longitudinal center line of the inner cavity of the shell, a joint seam is arranged between the shell and the sleeve core, a truncated cone-shaped magnesium prefabricated part is arranged outside the sleeve core, so that the thickness of the side wall of the upper part of the sleeve core is larger than that of the lower part of the sleeve core, the side wall scouring and erosion rate of the upper part of the sleeve core is higher than that of the lower part of the sleeve core, the service life of each part of the side wall of the sleeve core is synchronous, the whole inner wall and the outer wall of the sleeve core adopt a rotating surface design, the problem of cracks caused by heat stress concentration of the side wall of the sleeve core is solved, the inner part of the sleeve core is a paraboloid-shaped inner cavity which is divided into the upper part of the sleeve core inner cavity, the lower part of the, the bottom of the inner cavity of the sleeve core is a circular plane, the bottom surface of the bottom of the inner cavity of the sleeve core is in contact with the upper surface of the bottom of the inner cavity of the shell, and the sleeve core is directly prepared by isostatic pressing and sleeved with the shell to form the tundish turbulence controller, so that the overall performance is good, the shape of the inner cavity is favorably ensured, and the service life is long.
Preferably, the sleeve core is a round-table-shaped magnesium prefabricated part made of a magnesium carbon material by an isostatic pressing method, so that the compressive strength of the turbulence controller group is not less than 40Mpa, the forming quality is high, the overall performance is good, and the turbulence controller group is erosion-resistant and scour-resistant.
Preferably, the outer part of the sleeve core is in a circular truncated cone shape with a large upper bottom surface and a small lower bottom surface, the diameter D1 of the upper bottom surface of the circular truncated cone is 650-700 mm, and the diameter D2 of the lower bottom surface of the circular truncated cone is 570-620 mm;
preferably, the upper part of the inner cavity of the sleeve core is a cylindrical surface, the height a of the cylinder is 70-90 mm, the shape of the upper part of the inner cavity of the sleeve core is favorably kept, the service life is favorably prolonged, and the requirement of the special blank tundish on the service life of 36-40 hours is met.
Preferably, the lower part of the inner cavity of the sleeve core is small in upper opening and large in lower opening, the diameter d1 of the upper opening is 380-400 mm, the diameter d2 of the lower opening is 420-450 mm, the height h of the lower part of the inner cavity of the sleeve core is 280-320 mm, the thickness b of the bottom of the inner cavity of the sleeve core is 70-90 mm, and due to the design of the shape of the lower part of the inner cavity of the special sleeve core, the running track of steel flow is changed, the flow path is prolonged, and the average residence time of the steel flow in a tundish is prolonged.
Preferably, the width of the joint seam is large at the upper part and small at the lower part, the width m of the upper part is 10-15 mm, the width n of the lower part is 5-10 mm, the joint seam has the function of an expansion seam, the quality problem caused by thermal expansion of the magnesium-carbon sleeve core is avoided, the density of the filler at the lower part of the joint seam can be naturally increased, and the problem of steel infiltration of the joint seam penetrating from top to bottom is effectively solved.
A preparation method of a novel special-shaped blank tundish turbulence controller comprises the following steps:
firstly, a shell is cast and molded by adopting a magnesium spinel castable, the shape and the size of the shell are designed according to the shape and the size of a continuous casting tundish working lining impact area, the magnesium spinel castable produced by the prior art is cast and molded, and the magnesium spinel castable is prepared by natural curing and baking in a heating furnace; the magnesium spinel castable is produced by the prior art, the MgO content is more than or equal to 71 wt%, and the volume density is more than or equal to 3.03g/cm3The breaking strength (1500 ℃) is more than or equal to 9 Mpa;
secondly, the sleeve core is prepared by an isostatic pressing forming method and is prepared from the following raw materials in percentage by weight:
main materials: 76-84 wt% of sintered magnesia which is mixed by the particle size of less than or equal to 1mm and less than or equal to 3mm, the particle size of less than or equal to 0.074mm and the particle size of less than or equal to 0.074mm
Auxiliary materials: 11.5-16 wt% of flake graphite
Antioxidant: 2-5 wt% of a bonding agent which is one or a mixture of more of aluminum powder, silicon powder, aluminum-magnesium alloy powder and silicon carbide powder: 3.5-4.0 wt% of phenolic resin.
The sintered magnesia is produced by using light-burned magnesia with the MgO content of 95 wt% as a raw material through the processes of ball pressing, high-temperature shaft kiln calcination and the like, and the MgO content is 94-95 wt%.
The purity C content of the flake graphite is more than or equal to 98 wt%, and the granularity is 100 meshes.
The Al powder has a purity AI content of more than or equal to 99 wt% and a particle size of 100 meshes.
The silicon powder has the purity Si content of more than or equal to 97 wt% and the granularity of 100 meshes.
The Al-Mg alloy powder has an AI content of 50 +/-3 wt%, an AI + Mg content of more than or equal to 97 wt% and a particle size of 100 meshes.
The purity SiC content of the silicon carbide is more than or equal to 94 wt%, and the granularity of the silicon carbide is 100 meshes.
The solid content of the phenolic resin is more than or equal to 72 wt%, the residual carbon content is more than or equal to 42 wt%, and the water content is less than or equal to 5 wt%;
the sleeve core is prepared by an isostatic pressing forming method and comprises the following steps:
1) preparing materials: weighing the raw materials according to the proportion;
2) mixing: preheating a mixing roll to 40-50 ℃, adding sintered magnesia with the particle size being less than or equal to 1mm and less than or equal to 3mm and the particle size being less than 0.074mm and less than 1mm at low speed, → dry mixing for 1-2 minutes, adding phenolic resin → wet mixing for 2-3 minutes, adding flake graphite → wet mixing for 2-3 minutes, adding sintered magnesia with the particle size being less than or equal to 0.074mm and antioxidant → wet mixing for 2-3 minutes → high-speed mixing for 10-15 minutes → discharging, wherein the temperature of the pug in the mixing process is less than 70 ℃;
3) green body forming: filling the mud into a mold, then removing air in the mold, pressing and molding under the pressure of 200-250 MPa by equal static pressure, and then discharging the mold, thus completing green body molding;
4) naturally drying and baking: and (3) after the green body is molded and naturally dried for 8-16 hours, putting the green body into a kiln for baking: firstly, heating to 140-160 ℃ from room temperature at a heating rate of 10 ℃/h, and preserving heat for 4-8 hours; secondly, heating to 200-220 ℃ at a heating rate of 10 ℃/h, and preserving heat for 16-24 hours; and thirdly, stopping fire, naturally cooling to room temperature, taking out of the kiln, and finishing the preparation of the lower part (3) of the sleeve core, wherein the compressive strength of the sleeve core is more than or equal to 40 MPa.
Thirdly, coating a layer of magnesia coating material with the thickness of 25-35 mm on the outer surface of the sintered magnesia, wherein the magnesia carbon coating material is a coating material prepared by mixing regenerated magnesia carbon clay with the granularity of 1mm less than or equal to 3mm and 0.074mm less than or equal to 1mm and sintered magnesia fine powder, soft silica powder, silicon micropowder, sodium tripolyphosphate and the like according to a certain proportion in the prior art, and the weight percentage of the regenerated magnesia carbon particle material is 60-70%;
fourthly, the sleeve core is sleeved in a shell of the turbulence controller, the coincidence of the longitudinal center line of the sleeve core and the longitudinal center line of the inner cavity of the shell is ensured, a joint seam between the shell and the sleeve core is filled with sintered magnesia with the granularity of less than or equal to 1mm, natural maintenance is carried out for 1-2 days, and the preparation of the novel special-shaped blank continuous casting tundish turbulence controller is completed.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the tundish turbulence controller is formed by directly sleeving the sleeve core and the shell in an isostatic pressing manner, has good overall performance, is beneficial to ensuring the shape of the inner cavity, and has long service life.
(2) The utility model discloses a package turbulence controller's cover core in middle of dysmorphism base continuous casting is based on water mould experimental study and application test verify and the round platform shape container that designs that has special inner chamber shape, has effectively reduced the turbulent energy that the flow was annotated to the ladle to molten steel flow field in the middle of having improved betterly, the result of water mould experimental study shows, the utility model relates to a middle package turbulence controller than CN104707956B package turbulence controller in the middle of the special-shaped base continuous casting: the average dwell time of molten steel in the middle package improves more than 8.9% on the same scale, and the dead zone proportion reduces more than 7.4% on the same scale, uses the utility model discloses, the content of total oxygen reduces more than 13% on the same scale in the molten steel in the crystallizer.
(3) The utility model discloses be equipped with the joint line between special-shaped base continuous casting tundish turbulence controller's shell and the cover core, have the effect of expansion joint concurrently, the quality problems of having avoided causing because of magnesium carbon cover core thermal energy, and the width upper portion of joint line is big, the lower part is little, the steel problem that oozes that has effectively prevented joint line top-down to link up, joint line adopts the granularity to be less than or equal to 1 mm's sintering magnesia to pack the back simultaneously, paint the magnesium material of smearing that one deck thickness is 25 ~ 35mm on its surface, prevented that the stopping from falling the material problem, the quality reliability has been improved.
(4) The utility model discloses package turbulence controller's cover core in middle of the dysmorphism base continuous casting adopts magnesium carbon material, isostatic compaction preparation, has gained beneficial effect: the compression strength is not less than 40Mpa, the forming quality is high, the integral performance is good, the erosion resistance and the scouring resistance are realized, the problems that the sleeve core of the flow stabilizer of the beam blank continuous casting tundish, which is CN104707956B, is built by adopting arc-shaped magnesia carbon bricks in an annular mode, the integral performance is poor, the quality stability is poor, the service life is asynchronous with that of a tundish working lining are effectively solved, and the service life is prolonged to 36-40 hours from 31-35 hours at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a front view of the turbulence controller structure of the special-shaped blank continuous casting tundish of the utility model;
fig. 2 is a top view of the core structure of the special-shaped blank continuous casting tundish turbulence controller of the utility model.
In the figure, 1. a housing; 2. sleeving a core; 3. a joint seam; 4. the upper part of the inner cavity of the sleeve core; 5. the lower part of the inner cavity of the sleeve core, 6, the bottom of the inner cavity of the sleeve core.
Detailed Description
The following examples are further illustrative of the present invention, but the present invention is not limited thereto. The magnesium castable and the magnesium coating used in the examples are produced by adopting the prior art. Other raw materials are all commercial products:
the sintered magnesia is produced by using light-burned magnesia with the MgO content of 95 wt% as a raw material and through ball pressing, high-temperature shaft kiln calcination and other processes, wherein the MgO content is 94-95 wt%, and the sintered magnesia is prepared by mixing particles with the particle size of less than or equal to 1mm and less than or equal to 3mm, the particle size of less than or equal to 0.074mm and less than or equal to 1mm, and the particle size of less than or equal to 0.074 mm.
The purity C content of the flake graphite is more than or equal to 98 wt%, and the granularity of the flake graphite is 100 meshes.
The Al powder has a purity AI content of more than or equal to 99 wt% and a particle size of 100 meshes.
The silicon powder has a purity Si content of more than or equal to 97 wt% and a particle size of 100 meshes.
The Al-Mg alloy powder has Al content of 50 +/-3 wt%, Al + Mg content not less than 97 wt% and granularity of 100 mesh.
The SiC has purity more than or equal to 94 wt% and granularity of 100 meshes.
The solid content of the phenolic resin is more than or equal to 72 wt%, the residual carbon content is more than or equal to 42 wt%, and the water content is less than or equal to 5 wt%.
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments, and the magnesium castable and the magnesium dauber used in the embodiments are all produced by using the prior art.
Referring to figures 1-2 of the drawings,
example 1:
as shown in fig. 1 and 2, a novel special-shaped blank tundish turbulence controller comprises a shell 1 and a sleeve core 2, wherein the sleeve core 2 is arranged in an inner cavity of the shell 1, a longitudinal central line of the sleeve core 2 coincides with a longitudinal central line of the inner cavity of the shell 1, a joint seam 3 is arranged between the shell 1 and the sleeve core 2, the sleeve core 2 is a truncated cone-shaped magnesium prefabricated part, the sleeve core 2 is internally provided with a paraboloid-shaped inner cavity which is divided into a sleeve core inner cavity upper part 4, a sleeve core inner cavity lower part 5 and a sleeve core inner cavity bottom 6, the sleeve core inner cavity upper part 4 is a cylindrical surface, the sleeve core inner cavity lower part 5 is an inwards concave paraboloid of revolution, and the sleeve core inner cavity bottom 6 is a circular plane.
Preferably, the sleeve core 2 is a truncated cone-shaped magnesium preform made of a magnesium carbon material by an isostatic pressing method.
The sleeve core 2 of the turbulence controller is in a circular truncated cone shape with a large upper bottom surface and a small lower bottom surface, the diameter D1 of the upper bottom surface of the circular truncated cone is 700mm, and the diameter D2 of the lower bottom surface of the circular truncated cone is 620 mm; the upper part 4 of the inner cavity of the sleeve core is a cylindrical surface, the height a of the cylinder is 80mm, the lower part 5 of the inner cavity of the sleeve core is in a round drum shape with a small upper opening and a large lower opening, the diameter d1 of the upper opening is 400mm, the diameter d2 of the lower opening is 450mm, the height h of the lower part 5 of the inner cavity of the sleeve core is 300mm, and the thickness b of the bottom 6 of the inner cavity of the sleeve core is 80 mm.
The upper part of the width of the joint seam 3 is large, the lower part of the width of the joint seam is small, the width m of the upper part is 15mm, and the width n of the lower part is 10 mm.
The shape and the size of the shell 1 are designed according to the shape and the size of a continuous casting tundish working lining impact area, and the shell is prepared by casting and molding a magnesium castable produced by the prior art, natural curing and baking in a heating furnace.
The sleeve core 2 is prepared by an isostatic pressing forming method and is prepared from the following raw materials in percentage by weight:
main materials: 84 wt% of sintered magnesia which is mixed by the particle size of less than or equal to 1mm and less than or equal to 3mm, the particle size of less than or equal to 0.074mm and the particle size of less than or equal to 0.074mm
Auxiliary materials: flake graphite 10.5 wt%
Antioxidant: 2.0 wt% of aluminum powder
Binding agent: 3.5 wt% of phenolic resin.
The sleeve core 2 is prepared by an isostatic pressing forming method, and comprises the following steps:
1) preparing materials: weighing the raw materials according to the proportion;
2) mixing: preheating a mixing roll to 40 ℃, adding sintered magnesia with the granularity being less than or equal to 1mm and less than or equal to 3mm and the granularity being less than or equal to 1mm and 0.075mm at low speed → dry mixing for 1 minute, adding phenolic resin → wet mixing for 3 minutes, adding flake graphite → wet mixing for 2 minutes, adding sintered magnesia with the granularity being less than or equal to 0.075mm and antioxidant → wet mixing for 3 minutes → high-speed mixing for 10 minutes → discharging, wherein the temperature of the pug is less than 70 ℃ in the mixing process;
3) green body forming: filling the mud into a mold, then removing air in the mold, pressing and molding under the pressure of 200MPa by equal static pressure, and then discharging the mold, thus completing green body molding;
4) naturally drying and baking: and (3) after the green body is formed and naturally dried for 8 hours, putting the green body into a kiln for baking: uniformly and continuously heating to 140 ℃ from normal temperature, and preserving heat for 8 hours; uniformly and continuously heating the temperature to 200 ℃ from 140 ℃, preserving the heat for 16 hours, naturally cooling, then taking out of the kiln, and finishing the preparation of the sleeve core 2, wherein the compressive strength of the sleeve core is more than or equal to 40 MPa.
The preparation method of the novel special-shaped blank continuous casting tundish turbulence controller comprises the following steps: the method comprises the following steps of sleeving a sleeve core 2 in a shell 1 of the turbulence controller, ensuring that the longitudinal center line of the sleeve core 2 is coincident with the longitudinal center line of an inner cavity of the shell 1, filling a joint seam 3 between the shell 1 and the sleeve core 2 by using sintered magnesia with the granularity of less than or equal to 1mm, smearing a layer of magnesia coating material with the thickness of 25mm on the outer surface of the sintered magnesia coating material, and naturally maintaining for 1 day to complete the preparation of the novel special-shaped blank continuous casting tundish turbulence controller.
Example 2
As described in example 1, except that:
in the sleeve core 2 of the turbulence controller, the diameter D1 of the upper bottom surface of the circular truncated cone is 650mm, and the diameter D2 of the lower bottom surface of the circular truncated cone is 570 mm; the cylinder height a of the upper part 4 of the inner cavity of the sleeve core is 65mm, the upper opening diameter d1 of the lower part of the inner cavity of the sleeve core is 380mm, the lower opening diameter d2 is 420mm, the height h of the lower part 5 of the inner cavity of the sleeve core is 280mm, and the thickness b of the bottom 6 of the inner cavity of the sleeve core is 70 mm.
The upper part of the width of the joint seam 3 is large, the lower part is small, the width m of the upper part is 10mm, and the width n of the lower part is 5 mm.
The sleeve core 2 is prepared by an isostatic pressing forming method and is prepared from the following raw materials in percentage by weight:
main materials: 76 wt% of sintered magnesia which is mixed by the particle size of less than or equal to 1mm and less than or equal to 3mm, the particle size of less than or equal to 0.074mm and the particle size of less than or equal to 0.074mm
Auxiliary materials: 16 wt% of flake graphite
Antioxidant: 2 wt% of silicon powder and 2 wt% of silicon carbide powder
Binding agent: 4.0 wt% of phenolic resin.
The sleeve core 2 is prepared by an isostatic pressing forming method, and comprises the following steps:
1) preparing materials: weighing the raw materials according to the proportion;
2) mixing: preheating a mixing roll to 50 ℃, adding sintered magnesia with the granularity being less than or equal to 1mm and less than or equal to 3mm and the granularity being less than or equal to 0.074mm and less than 1mm at low speed → dry mixing for 2 minutes, adding phenolic resin → wet mixing for 2 minutes, adding flake graphite → wet mixing for 3 minutes, adding sintered magnesia with the granularity being less than or equal to 0.074mm and antioxidant → wet mixing for 2 minutes → high-speed mixing for 15 minutes → discharging, wherein the temperature of the pug is less than 70 ℃ in the mixing process;
3) green body forming: filling the mud into a mold, then removing air in the mold, pressing and molding under 250MPa by isostatic pressure, and then discharging the mold, thus completing green body molding;
4) naturally drying and baking: and (3) forming a green body, naturally drying for 16 hours, and then baking in a kiln: uniformly and continuously heating to 160 ℃ from normal temperature, and preserving heat for 8 hours; uniformly and continuously heating to 220 ℃ from 160 ℃, preserving heat for 24 hours, naturally cooling, and taking out of the kiln to finish the preparation of the sleeve core 2, wherein the compressive strength of the sleeve core is more than or equal to 40 MPa.
The preparation method of the novel special-shaped blank continuous casting tundish turbulence controller comprises the following steps: the method comprises the following steps of sleeving a sleeve core 2 in a shell 1 of the turbulence controller, ensuring that the longitudinal center line of the sleeve core 2 is coincident with the longitudinal center line of an inner cavity of the shell 1, filling a joint seam 3 between the shell 1 and the sleeve core 2 by using sintered magnesia with the granularity of less than or equal to 1mm, smearing a layer of magnesia coating material with the thickness of 35mm on the outer surface of the sintered magnesia coating material, and naturally maintaining for 1 day to complete the preparation of the novel special-shaped blank continuous casting tundish turbulence controller.
Example 3
As described in example 1, except that:
in the sleeve core 2 of the turbulence controller, the diameter D1 of the upper bottom surface of the circular truncated cone is 670mm, and the diameter D2 of the lower bottom surface of the circular truncated cone is 600 mm; the cylinder height a of the upper part 4 of the inner cavity of the sleeve core is 95mm, the upper opening diameter d1 of the lower part of the inner cavity of the sleeve core is 390mm, the lower opening diameter d2 is 440mm, the height h of the lower part 5 of the inner cavity of the sleeve core is 290mm, and the thickness b of the bottom 6 of the inner cavity of the sleeve core is 90 mm.
The upper part of the width of the joint seam 3 is large, the lower part is small, the width m of the upper part is 12mm, and the width n of the lower part is 7 mm.
The sleeve core 2 is prepared by an isostatic pressing forming method and is prepared from the following raw materials in percentage by weight:
main materials: 79 wt% of sintered magnesia which is mixed by the particle size of less than or equal to 1mm and less than or equal to 3mm, the particle size of less than or equal to 0.074mm and the particle size of less than or equal to 0.074mm
Auxiliary materials: flake graphite 14 wt%
Antioxidant: 3.3 wt% of aluminum-magnesium alloy powder
Binding agent: 3.7 wt% of phenolic resin.
The sleeve core 2 is prepared by an isostatic pressing forming method, and comprises the following steps:
1) preparing materials: weighing the raw materials according to the proportion;
2) mixing: preheating a mixing roll to 45 ℃, adding sintered magnesia with the granularity being less than or equal to 1mm and less than or equal to 3mm and the granularity being less than or equal to 1mm and 0.074mm at a low speed, → dry mixing for 1 minute, adding phenolic resin → wet mixing for 3 minutes, adding flake graphite → wet mixing for 3 minutes, adding sintered magnesia with the granularity being less than or equal to 0.074mm and an antioxidant → wet mixing for 2 minutes → high-speed mixing for 10 minutes → discharging, wherein the temperature of the pug is less than 70 ℃ in the mixing process;
3) green body forming: filling the mud into a mold, then removing air in the mold, pressing and molding under 220MPa by isostatic pressure, and then discharging the mold, thus completing green body molding;
4) naturally drying and baking: and (3) after the green body is formed and naturally dried for 12 hours, putting the green body into a kiln for baking: uniformly and continuously heating to 150 ℃ from normal temperature, and preserving heat for 6 hours; uniformly and continuously heating the temperature to 210 ℃ from 150 ℃, preserving the heat for 20 hours, naturally cooling, then taking out of the kiln, and finishing the preparation of the sleeve core 2, wherein the compressive strength of the sleeve core is more than or equal to 40 MPa.
The preparation method of the novel special-shaped blank continuous casting tundish turbulence controller comprises the following steps: the method comprises the following steps of sleeving a sleeve core 2 in a shell 1 of the turbulence controller, ensuring that the longitudinal center line of the sleeve core 2 is coincident with the longitudinal center line of an inner cavity of the shell 1, filling a joint seam 3 between the shell 1 and the sleeve core 2 by using sintered magnesia with the granularity of less than or equal to 1mm, smearing a layer of magnesia coating material with the thickness of 30mm on the outer surface of the sintered magnesia coating material, naturally maintaining for 1 day, and completing the preparation of the novel long-life continuous casting tundish turbulence controller.
Comparative example: CN104707956B discloses a special-shaped blank continuous casting tundish turbulence controller and a mounting method thereof, the controller comprises a shell, a bottom plate, a sleeve core and a pressure ring, wherein the shell is of a cavity structure with an opening at the upper end, the bottom plate is positioned on the bottom of a cavity of the shell, the bottom end of the sleeve core is positioned on the bottom plate, the pressure ring is arranged at the upper end of the sleeve core and positioned in the cavity of the shell, expansion joints are arranged between the bottom of the cavity of the shell and the bottom plate as well as between the inner wall of the shell and the sleeve core, and the pressure ring is arranged above the sleeve core, so that the problem that magnesia carbon bricks; when the turbulence controller is installed, a plurality of pressing bricks are arranged on the same circumference in the same plane above the pressing ring, so that the problem of overall floating of the turbulence controller is solved.
The embodiment 1-3 of the utility model and the reference CN104707956B disclose a special-shaped blank continuous casting tundish turbulence controller all establish the water model according to the similarity ratio 1:2, the comparative analysis of the water model experimental result, as shown in the following table 1:
TABLE 1
Through the data contrast in the last table 1, the utility model discloses a tundish torrent controller compares ratio CN104707956B tundish current stabilizer in the middle of the beam blank continuous casting: the average residence time of the molten steel in the tundish is improved by more than 8.9 percent on the same scale, and the dead zone proportion is reduced by more than 7.4 percent on the same scale.
The embodiments 1-3 and the reference CN104707956B of the present invention disclose a structural material of a beam blank continuous casting tundish turbulence controller, a service life and a total oxygen content in molten steel in a crystallizer (a comparative test steel Q355B, a gas sample is taken from the crystallizer, and an oxygen content is detected. the oxygen content in steel is the sum of dissolved oxygen and non-metallic oxide inclusion combined oxygen, because the dissolved oxygen content is not too much, the oxygen content of non-metallic oxide inclusion in steel is generally considered to be total oxygen content, that is, the height of the total oxygen content in steel represents the oxide inclusion control level in steel) in beam blank continuous casting tundish application condition comparison of a beam blank continuous casting of a ledwi steel group silver mountain shaped steel Limited company, as shown in the following Table 2:
comparison of the application of the shaped billet continuous casting tundish of the Laiwu iron group Yinshan type Steel Co Ltd, as shown in Table 2 below
TABLE 2
Through the data contrast in last table 2, the utility model discloses the novel special-shaped blank continuous casting tundish turbulence controller's of preparation life compares with current patent technology CN104707956B the special-shaped blank continuous casting tundish turbulence controller improves more than 5 hours on year, and the content of total oxygen reduces more than 13% on year in the molten steel in the crystallizer
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. The utility model provides a novel special-shaped blank tundish turbulence controller, includes shell (1) and cover core (2), cover core (2) set up in the inner chamber of shell (1), and the longitudinal center line of cover core (2) and the longitudinal center line coincidence of shell (1) inner chamber are equipped with joint line (3) between shell (1) and cover core (2), its characterized in that: the sleeve core (2) is a round-table-shaped magnesium prefabricated part which is made of a magnesium carbon material by an isostatic pressing forming method, the inner part of the sleeve core (2) is a paraboloid-shaped inner cavity which is divided into an upper part (4) of the sleeve core inner cavity, a lower part (5) of the sleeve core inner cavity and a bottom (6) of the sleeve core inner cavity, the upper part (4) of the sleeve core inner cavity is a cylindrical surface, the lower part (5) of the sleeve core inner cavity is an inwards concave paraboloid of revolution, and the bottom (6) of the sleeve core inner cavity is a circular plane.
2. The novel special-shaped blank tundish turbulence controller according to claim 1, characterized in that: the outer part of the sleeve core (2) is in a circular truncated cone shape with a large upper bottom surface and a small lower bottom surface, the diameter D1 of the upper bottom surface of the circular truncated cone is 650-700 mm, and the diameter D2 of the lower bottom surface of the circular truncated cone is 570-620 mm.
3. The novel special-shaped blank tundish turbulence controller according to claim 2, characterized in that: the upper part (4) of the inner cavity of the sleeve core (2) is a cylindrical surface, and the height a of the cylinder is 70-90 mm.
4. The novel special-shaped blank tundish turbulence controller according to claim 3, characterized in that: the upper opening of the lower part (5) of the inner cavity of the sleeve core is small, the lower opening of the inner cavity of the sleeve core is large, the diameter d1 of the upper opening is 380-400 mm, the diameter d2 of the lower opening is 420-450 mm, the height h of the lower part (5) of the inner cavity of the sleeve core is 280-320 mm, and the thickness b of the bottom (6) of the inner cavity of the sleeve core is 70-90 mm.
5. The novel special-shaped blank tundish turbulence controller according to any one of claims 1-4, characterized in that: the width of the joint seam (3) is large at the upper part and small at the lower part, the width m of the upper part is 10-15 mm, and the width n of the lower part is 5-10 mm.
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| CN111113633A (en) * | 2020-01-20 | 2020-05-08 | 莱芜钢铁集团银山型钢有限公司 | Novel special-shaped blank tundish turbulence controller and preparation method thereof |
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| CN111113633A (en) * | 2020-01-20 | 2020-05-08 | 莱芜钢铁集团银山型钢有限公司 | Novel special-shaped blank tundish turbulence controller and preparation method thereof |
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