CN113385664A - Novel anti-seepage steel integral type nozzle and installation method thereof - Google Patents
Novel anti-seepage steel integral type nozzle and installation method thereof Download PDFInfo
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- CN113385664A CN113385664A CN202110528155.2A CN202110528155A CN113385664A CN 113385664 A CN113385664 A CN 113385664A CN 202110528155 A CN202110528155 A CN 202110528155A CN 113385664 A CN113385664 A CN 113385664A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000009434 installation Methods 0.000 title claims abstract description 19
- 239000011449 brick Substances 0.000 claims abstract description 107
- QQHSIRTYSFLSRM-UHFFFAOYSA-N alumanylidynechromium Chemical compound [Al].[Cr] QQHSIRTYSFLSRM-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 46
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000004927 clay Substances 0.000 claims abstract description 22
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 230000008595 infiltration Effects 0.000 abstract description 6
- 238000001764 infiltration Methods 0.000 abstract description 6
- 101100327917 Caenorhabditis elegans chup-1 gene Proteins 0.000 description 33
- 239000000463 material Substances 0.000 description 10
- 229910052593 corundum Inorganic materials 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 229910001845 yogo sapphire Inorganic materials 0.000 description 9
- 238000009749 continuous casting Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 210000003298 dental enamel Anatomy 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- QRRWWGNBSQSBAM-UHFFFAOYSA-N alumane;chromium Chemical compound [AlH3].[Cr] QRRWWGNBSQSBAM-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000003749 cleanliness Effects 0.000 description 1
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- 238000007667 floating Methods 0.000 description 1
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- 229910052749 magnesium Inorganic materials 0.000 description 1
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- 239000002893 slag Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a novel anti-seepage steel integral type nozzle and an installation method thereof. The invention provides a method for installing a novel impermeable steel integral nozzle, which comprises the following steps of S1: installing the brick cup in the tundish; s2, coating high-alumina fire clay on the bottom of the brick cup; s3: coating aluminum-chromium refractory mortar on the part of the outer wall of the upper end of the integral water gap, which is contacted with the brick cup; s4, placing the integral water gap into a brick cup; s5: a bowl part of the integral water gap is padded with a rubber gasket; s6: and heating and baking the integral nozzle and the brick cup together. A novel anti-seepage steel integral nozzle comprises a pocket brick, a nozzle body arranged in the pocket brick and a nozzle bowl part, wherein a high-alumina fire clay layer is coated on the part, contacting the pocket brick, of the lower end of the nozzle body; the part of the upper end of the nozzle body, which is contacted with the brick cup, is coated with an aluminum-chromium refractory mud layer. The integral water gap has simple structure and simple and convenient installation method operation, and can effectively prevent the occurrence of the phenomenon of steel infiltration in the gap between the ladle bottom and the brick cup matched with the ladle bottom.
Description
Technical Field
The invention relates to the technical field of water gaps, in particular to a novel anti-seepage steel integral type water gap and an installation method thereof.
Background
The tundish is an intermediate device for connecting the steel ladle and the crystallizers in the continuous casting process, molten steel in the steel ladle enters the tundish buffer memory through the long nozzle, flows through the nozzle arranged at the bottom of the tundish and is shunted to each crystallizer, and continuous casting is realized. Along with the rapid development of metallurgical technology, the requirements on the cleanliness of molten steel and the quality of casting blanks are higher and higher, the use of the integral water gap plays an important role in reducing the secondary oxidation of the molten steel, and the head part of the integral water gap is slightly higher than the bottom part of a tundish during installation, so that the flowing state of the molten steel in the tundish can be effectively improved, the slag entrapment is reduced, and the floating removal of inclusions is improved. Therefore, the application of the integral nozzle in the production of clean steel, particularly high-grade steel is more and more extensive.
The integral water gap is matched with a brick cup arranged in an opening at the bottom of the tundish body for use, and before installation, fire clay is coated manually for filling a gap between the integral water gap and the brick cup. However, in the using process, on one hand, because the gaps and the upper edges of the brick cups are directly contacted with the high-temperature molten steel in the tundish, the smeared fire mud is easy to generate a net-shaped structure in the heating process, so that the molten steel leaks downwards along the net-shaped channel; on the other hand, the middle package is at the in-process that bears high temperature molten steel for a long time, and there is deformation of certain degree at the bottom of the package, leads to the gap thickness between whole mouth of a river and the brick cup uneven, and the cooperation is strict, and the formation that leads to the type passageway that runs through has further increased the risk of molten steel seepage, influences the casting in good order when serious, leads to the production accident even, brings very big hidden danger to the safety in production. How to solve the molten steel leakage between the integral nozzle of the tundish and the brick cup becomes the key point of attention of metallurgy workers.
In order to prevent the occurrence of steel tragedy, some technicians propose a method of ramming layer by layer to tightly combine a ramming material layer around a nozzle so as to reduce steel leakage, but the method needs to adopt a special stepped brick cup to ensure that the ramming material layer is positioned in an annular cavity formed between the upper layer of the step of the brick cup and the nozzle, and the manufacturing and the construction are complex.
Some technical personnel reach the purpose that prevents the mouth of a river clearance and ooze the steel through sitting the separating ring of brick and mouth of a river inter-installation area surface recess, and this separating ring inner surface has the recess, has increased the effective area of contact of fireclay and mouth of a river, has improved the firm intensity at mouth of a river, has reduced and has oozed the steel risk, but the adoption of separating ring has increased the complexity of mechanism, has improved use cost.
Still another technical personnel adopt a brick cup with a circular platform, and the circular platform can be filled with filler, so that the inner surface of the filler is in close contact with the outer wall of the submerged nozzle, but because the upper edge of the filler is directly contacted with high-temperature molten steel, the risk of being corroded and penetrated by the molten steel is increased.
All the above methods have certain limitations, and therefore, there is a need to design a new impervious steel integral type nozzle and a mounting method thereof to improve the above defects and problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a novel anti-seepage steel integral type nozzle and an installation method thereof, which are applied to the pouring process of a continuous casting tundish.
The technical purpose of the invention is realized by the following technical scheme: a novel method for installing an impermeable steel integral nozzle comprises the following steps:
s1: installing the brick cup in the tundish;
s2: after the brick cup is installed, smearing high-alumina fire clay on the bottom of the brick cup;
s3: after high-alumina cement is coated, coating aluminum-chromium refractory mortar on the part of the outer wall of the upper end of the integral water gap, which is contacted with the brick cup;
an upper groove and a lower groove are formed in the outer wall of the upper end of the integral water gap;
the upper groove and the lower groove are arc-shaped grooves;
coating the aluminum-chromium refractory mortar to the lower groove;
s4: after the aluminum-chromium refractory mortar is coated, the integral nozzle is placed into a brick cup;
s5: after the integral water gap is placed, a bowl part of the integral water gap is padded with a rubber gasket;
s6: and (4) after the rubber gasket is filled, heating and baking the integral nozzle and the brick cup together to finish the installation of the integral nozzle.
In one embodiment, in step S3, Al is added to the applied Al-Cr refractory mortar composition2O3Is not less than 85 percent, and Cr2O3Is not less than 3%.
In one embodiment, in step S4, after the monolithic nozzle is placed in the brick cup, the bowl of the monolithic nozzle is between 15mm and 25mm higher than the bottom of the tundish.
In one embodiment, in step S2, the thickness of the high-alumina fire clay coated on the lower end of the one-piece nozzle is not more than 2 mm.
In one embodiment, in step S3, the grain size of the aluminum-chromium refractory mortar applied to the portion of the monolithic nozzle where the upper end contacts the brick cup is less than 200 mesh.
In one embodiment, in step S4, the center of the one-piece nozzle is offset from the center of the brick cup by no more than 1 mm.
A novel anti-seepage steel integral type nozzle, which comprises a nozzle body and a nozzle bowl part which are arranged in a brick cup,
the water gap bowl part is arranged above the water gap body and is integrally formed with the water gap body;
a high-alumina fire clay layer is coated on the part, which is in contact with the brick cup, of the lower end of the nozzle body;
and an aluminum-chromium refractory mud layer is coated on the upper end of the nozzle body, which is in contact with the brick cup.
In one embodiment, the outer wall of the upper end of the nozzle body is provided with at least two circles of grooves.
In one embodiment, the thickness of the high-alumina fire clay layer coated on the part of the lower end of the nozzle body, which is in contact with the brick cup, is not more than 2 mm.
In one embodiment, the grain diameter of the aluminum-chromium refractory mortar coated on the part of the upper end of the nozzle body, which is in contact with the brick cup, is less than 200 meshes.
In conclusion, the invention has the following beneficial effects:
firstly, sequentially comprises the following steps: s1: installing the brick cup in the tundish; s2: coating high-aluminum fire clay on the bottom of the brick cup; s3: coating aluminum-chromium refractory mortar on the part, in contact with the brick cup, of the outer wall at the upper end of the integral water gap, and coating the aluminum-chromium refractory mortar to the lower groove; (ii) a S4: putting the integral water gap into a brick cup; s5: a bowl part of the integral water gap is padded with a rubber gasket; s6: heating and baking the integral nozzle and the brick cup together to complete the installation of the integral nozzle; the installation method is simple and convenient to operate, and by using the method for installing the integral nozzle, no steel infiltration phenomenon occurs in the casting process of a continuous casting machine, so that the steel infiltration phenomenon of a gap between a ladle bottom and a brick cup matched with the ladle bottom can be effectively prevented, and the potential safety hazard in the production process is reduced.
Secondly, the integral water gap is formed by integrally forming a water gap bowl part and the water gap body; a high-alumina fire clay layer is coated on the part of the lower end of the nozzle body, which is contacted with the brick cup; the upper end of the nozzle body is coated with an aluminum-chromium refractory mud layer at the part contacted with the brick cup, and at least two circles of grooves are formed in the outer wall of the upper end of the nozzle body. This whole type mouth of a river simple structure uses this whole type mouth of a river, and the conticaster pouring process does not have the steel phenomenon of oozing and takes place, can effectively prevent to wrap the bottom of the package rather than the emergence that the steel phenomenon was oozed in the gap between the matched with brick cup, has reduced the potential safety hazard in the production process.
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 the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a unitary nozzle according to the present invention;
FIG. 2 is a schematic cross-sectional view of the nozzle body and nozzle bowl provided by the present invention after installation;
fig. 3 is a schematic sectional structure view of a brick cup provided by the invention.
In the figure: 1-brick setting; 2-the nozzle body; 21-a groove; 211-upper groove; 212-lower groove; 3-water gap bowl part; 4-high alumina fire clay layer; 5-an aluminum-chromium refractory mud layer; 6-tundish; 7-rubber gasket.
Detailed Description
The technical solutions 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 a part of the embodiments of the present invention, and not all of the embodiments.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
Example 1
See fig. 1-3
Example 1 shows a bloom caster for producing a 5-strand 5 stream having a strand cross-section of 320mm x 425 mm.
The installation method of the novel impermeable steel integral nozzle comprises the following steps:
s1: before the brick cup 1 is installed, sundries of a reference plate of the integral nozzle need to be cleaned. Then the brick cup 1 is arranged in the tundish 6; the brick cup 1 is arranged at the bottom of the tundish 6, the bottom working layer of the tundish 6 is made of magnesium refractory materials, the periphery of the brick cup 1, which is in contact with the working layer of the tundish 6, is tamped by a tamping material, and the brick cup 1 needs to be aligned to the center when arranged at the bottom of the tundish 6, and the deviation of the centers of the brick cup 1 and the brick cup is controlled within 1 mm.
S2: after the brick cup 1 is installed, smearing high-alumina fire clay 4 on the bottom of the brick cup; the thickness of the high-alumina fire clay 4 smeared at the bottom of the brick cup is not more than 2 mm.
S3: after the high-alumina cement 4 is coated, coating the part of the outer wall of the upper end of the integral nozzle, which is in contact with the brick cup 1, with aluminum-chromium refractory mortar 5, wherein the outer wall of the upper end of the integral nozzle is provided with an upper groove 211 and a lower groove 212; the upper groove 211 and the lower groove 212 are arc-shaped grooves, so that the contact area of the aluminum-chromium refractory mortar and the grooves is increased, and the integral nozzle is more firmly combined with the brick cup 1; the aluminum chromium refractory mortar is coated on the lower groove 212, the aluminum chromium refractory mortar 5 does not need to be coated on the upper groove 211, and the lower groove is formed during installationThe aluminum chromium refractory mortar 5 at the groove 212 can be extruded into the upper groove 211 due to extrusion, so that the waste of the aluminum chromium refractory mortar 5 is reduced, and the aluminum chromium refractory mortar 5 can be saved; in addition, upper groove 211 and lower groove 212 are the arc state, have increased the area of contact with aluminium chromium matter chamotte 5 for whole type mouth of a river is connected more firmly stably with brick cup 1, has reduced the risk of steel infiltration. The material of the water gap body 2 is aluminum carbon; among the material components of the brick cup, Al2O3Is not less than 65% by mass, Fe2O3Is not more than 1.5 percent; in the component 5 of the aluminum-chromium refractory mortar, Al2O3Is not less than 85 percent, and Cr2O3Is not less than 3 percent; the expansion performance of the three is consistent, the gap generated by the separation of the material coated with the foam and the water gap body 2 due to the unmatched expansion process is avoided, and the risk of steel penetration is further reduced. The aluminum chromium refractory mortar 5 is mechanically stirred uniformly, so that the diameter and the granularity of the aluminum chromium refractory mortar are fine and uniform. It should be noted that the stirred refractory mortar must be used up within several hours to prevent solidification. The grain diameter of the aluminum-chromium refractory mortar 5 coated on the part of the upper end of the integral nozzle, which is contacted with the brick cup 1, is less than 200 meshes. The occupancy rate of the aluminum-chromium refractory mortar with the grain diameter less than 200 meshes needs to be more than 95 percent. In the coated aluminum-chromium refractory mortar 5 component, Al2O3Is not less than 85 percent, and Cr2O3Is not less than 3%. Wherein, the addition of chromium can play a certain role in resisting molten steel erosion.
S4: after the aluminum-chromium refractory mortar 5 is coated, the integral nozzle is vertically placed into the brick cup 1; the deviation between the center of the integral nozzle and the center of the brick cup is not more than 1 mm. After the integral nozzle is placed in the brick cup 1, the nozzle bowl 3 of the integral nozzle is higher than the bottom of the tundish 6 by between 15 and 25 mm. The bottom of the integral water gap extends out of the bottom of the tundish 6.
S5: after the integral water gap is placed, a water gap bowl part 3 of the integral water gap is padded with a rubber gasket 7; after the rubber gasket 7 is placed on the cushion, the rubber gasket 7 is pressed firmly by force to be tightly jointed with the brick cup 1. The rubber gasket 7 protrudes out of the bottom of the tundish 6 by a difference of no more than 10 mm.
S6: and (3) after the rubber gasket 7 is filled, heating and baking the integral nozzle and the brick cup 1 together to finish the installation of the integral nozzle.
The installation method is simple and convenient to operate, and steel infiltration does not occur in the casting process of the continuous casting machine, so that the steel infiltration phenomenon of gaps between the ladle bottom and the matched brick cup can be effectively prevented, and the potential safety hazard in the production process is reduced.
A novel anti-seepage steel integral type nozzle comprises a nozzle body 2 and a nozzle bowl part 3 which are arranged in a brick cup 1, wherein the nozzle bowl part 3 is arranged above the nozzle body 2, and the nozzle bowl part 3 and the nozzle body 2 are integrally formed; the material of the nozzle body 2 is aluminum carbon, wherein Al2O3Is not less than 48% by mass, and the mass fraction of carbon is not less than 15% by mass. Among the material components of the brick cup, Al2O3Is not less than 65% by mass, Fe2O3The weight percentage of the brick is not more than 1.5 percent, the refractoriness under load of the brick cup is higher than 1550 ℃, and the brick cup has certain thermal shock stability.
Processing of the groove 21 at the upper end of the nozzle body 2: the grooves 21 are arc-shaped and two or three in number. The outer surface of the nozzle body 2 is processed into two circles of arc-shaped grooves 21 by a machining method, wherein the diameter of an inner hole of the nozzle body 2 is 55mm, the diameter of an outer wall of the nozzle body is 150mm, the whole length of the nozzle body is 1050mm, an enamel layer is coated on the bowl part 3 of the nozzle, and the height of the enamel layer is 70 mm; the height of the part of the nozzle bowl 3 in direct contact with the brick cup 1 is 210mm, the distance from the higher groove 21 to the end face of the top end of the nozzle body 2 is 100mm, the distance from the lower groove 21 to the higher groove 21 is 30mm, and the cross section of the groove 21 is in a semicircular shape with the radius of 6.5 mm.
A high-alumina fire clay layer 4 is coated on the part of the lower end of the nozzle body 2, which is in contact with the brick cup 1; the part of the upper end of the nozzle body 2, which is contacted with the brick cup 1, is coated with an aluminum-chromium refractory mud layer 5. The aluminum chromium refractory mortar 5 is mechanically stirred uniformly, so that the diameter and the granularity of the aluminum chromium refractory mortar are fine and uniform. It should be noted that the stirred refractory mortar must be used up within several hours to prevent solidification. The grain diameter of the aluminum-chromium refractory mortar 5 coated on the part of the upper end of the integral nozzle, which is contacted with the brick cup 1, is less than 200 meshes. Particle size less than 200The occupancy of the target aluminum-chromium refractory mortar is required to be more than 95%. In the coated aluminum-chromium refractory mortar 5 component, Al2O3Is not less than 85 percent, and Cr2O3Is not less than 3%. Wherein, the addition of chromium can play a certain role in resisting molten steel erosion. At least two circles of grooves 21 are arranged on the outer wall of the upper end of the water gap body 2. The groove 21 may be two or three turns. The thickness of the high-alumina fire clay layer 4 coated on the part of the lower end of the nozzle body 2, which is in contact with the brick cup 1, is not more than 2 mm. The grain diameter of the aluminum-chromium refractory mortar smeared on the part of the upper end of the nozzle body 2, which is in contact with the brick cup 1, is less than 200 meshes. The occupancy rate of the aluminum-chromium refractory mortar with the grain diameter less than 200 meshes needs to be more than 95 percent.
An integral nozzle, which is formed by integrally molding a nozzle bowl 3 and a nozzle body 2; a high-alumina fire clay layer 4 is coated on the part of the lower end of the nozzle body 2, which is in contact with the brick cup 1; the part of the upper end of the nozzle body 2 contacting with the brick cup 1 is coated with an aluminum-chromium refractory mud layer 5, and at least two circles of grooves 21 are arranged on the outer wall of the upper end of the nozzle body 2, and the grooves 21 are arc-shaped. This whole type mouth of a river simple structure uses this whole type mouth of a river, and the conticaster pouring process does not have the steel phenomenon of oozing and takes place, can effectively prevent to wrap the bottom of the package rather than the emergence that the steel phenomenon was oozed in the gap between the matched with brick cup, has reduced the potential safety hazard in the production process.
Example 2
See fig. 1-3
Example 2 shows the application to a billet caster producing billets with a billet cross section of 160mm x 160 mm.
The installation method of the novel impermeable steel integral type nozzle of the embodiment 2 is the same as that of the embodiment 1, so that the installation method is not repeated. The difference is in the size of the unitary nozzle.
A novel anti-seepage steel integral type nozzle comprises a nozzle body 2 and a nozzle bowl part 3 which are arranged in a brick cup 1, wherein the nozzle bowl part 3 is arranged above the nozzle body 2, and the nozzle bowl part 3 and the nozzle body 2 are integrally formed; the material of the nozzle body 2 is aluminum carbon, wherein Al2O3Is not less than 48% by mass, and the mass fraction of carbon is not less than 15% by mass. Among the material components of the brick cup, Al2O3Is not less than 65% by mass, Fe2O3The weight percentage of the brick is not more than 1.5 percent, the refractoriness under load of the brick cup is higher than 1550 ℃, and the brick cup has certain thermal shock stability.
Processing of the groove 21 at the upper end of the nozzle body 2: the grooves 21 are arc-shaped and two or three in number. The outer surface of the nozzle body 2 is processed into two circles of arc-shaped grooves 21 by a machining method, wherein the diameter of an inner hole of the nozzle body 2 is 32mm, the diameter of an outer wall of the nozzle body is 140mm, the whole length of the nozzle body is 1010mm, an enamel layer is coated on the bowl part 3 of the nozzle, and the height of the enamel layer is 70 mm; the height of the part of the nozzle bowl 3 in direct contact with the brick cup 1 is 210mm, the distance from the higher groove 21 to the end face of the top end of the nozzle body 2 is 90mm, the distance from the lower groove 21 to the higher groove 21 is 20mm, and the cross section of the groove 21 is in a semicircular shape with the radius of 5 mm.
A high-alumina fire clay layer 4 is coated on the part of the lower end of the nozzle body 2, which is in contact with the brick cup 1; the part of the upper end of the nozzle body 2, which is contacted with the brick cup 1, is coated with an aluminum-chromium refractory mud layer 5. The aluminum chromium refractory mortar 5 is mechanically stirred uniformly, so that the diameter and the granularity of the aluminum chromium refractory mortar are fine and uniform. It should be noted that the stirred refractory mortar must be used up within several hours to prevent solidification. The grain diameter of the aluminum-chromium refractory mortar 5 coated on the part of the upper end of the integral nozzle, which is contacted with the brick cup 1, is less than 200 meshes. The occupancy rate of the aluminum-chromium refractory mortar with the grain diameter less than 200 meshes needs to be more than 95 percent. In the coated aluminum-chromium refractory mortar 5 component, Al2O3Is not less than 85 percent, and Cr2O3Is not less than 3%. Wherein, the addition of chromium can play a certain role in resisting molten steel erosion. At least two circles of grooves 21 are arranged on the outer wall of the upper end of the water gap body 2. The groove 21 may be two or three turns. The thickness of the high-alumina fire clay layer 4 coated on the part of the lower end of the nozzle body 2, which is in contact with the brick cup 1, is not more than 2 mm. The grain diameter of the aluminum-chromium refractory mortar smeared on the part of the upper end of the nozzle body 2, which is in contact with the brick cup 1, is less than 200 meshes. The occupancy rate of the aluminum-chromium refractory mortar with the grain diameter less than 200 meshes needs to be more than 95 percent.
An integral nozzle, which is formed by integrally molding a nozzle bowl 3 and a nozzle body 2; a high-alumina fire clay layer 4 is coated on the part of the lower end of the nozzle body 2, which is in contact with the brick cup 1; the part of the upper end of the nozzle body 2 contacting with the brick cup 1 is coated with an aluminum-chromium refractory mud layer 5, and at least two circles of grooves 21 are arranged on the outer wall of the upper end of the nozzle body 2, and the grooves 21 are arc-shaped. This whole type mouth of a river simple structure uses this whole type mouth of a river, and the conticaster pouring process does not have the steel phenomenon of oozing and takes place, can effectively prevent to wrap the bottom of the package rather than the emergence that the steel phenomenon was oozed in the gap between the matched with brick cup, has reduced the potential safety hazard in the production process.
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. A method for installing a novel impermeable steel integral nozzle, which is characterized in that,
the method comprises the following steps:
s1: installing the brick cup in the tundish;
s2: after the brick cup is installed, smearing high-alumina fire clay on the bottom of the brick cup;
s3: after high-alumina cement is coated, coating aluminum-chromium refractory mortar on the part of the outer wall of the upper end of the integral water gap, which is contacted with the brick cup;
an upper groove (211) and a lower groove (212) are formed in the outer wall of the upper end of the integral water gap;
the upper groove (211) and the lower groove (212) are both arc-shaped grooves;
the aluminum-chromium refractory mortar is smeared at the lower groove (212);
s4: after the aluminum-chromium refractory mortar is coated, the integral nozzle is placed into a brick cup;
s5: after the integral water gap is placed, a bowl part of the integral water gap is padded with a rubber gasket;
s6: and (4) after the rubber gasket is filled, heating and baking the integral nozzle and the brick cup together to finish the installation of the integral nozzle.
2. The method for installing a novel impermeable steel integral type nozzle as claimed in claim 1,
in step S3, Al is contained in the applied Al-Cr refractory mortar composition2O3Is not less than 85 percent, and Cr2O3Is not less than 3%.
3. The method for installing a novel impermeable steel integral type nozzle as claimed in claim 2,
in step S4, after the monolithic nozzle is placed in the brick cup, the bowl of the monolithic nozzle is higher than the bottom of the tundish by between 15mm and 25 mm.
4. A novel method for installing an anti-seepage steel integral nozzle according to claim 3,
in step S2, the thickness of the high-alumina fire clay smeared at the lower end of the one-piece nozzle is not more than 2 mm.
5. The method for installing a novel impermeable steel integral type nozzle according to claim 4,
in step S3, the grain size of the aluminum-chromium refractory mortar applied to the portion of the monoblock nozzle upper end in contact with the brick cup is less than 200 mesh.
6. A method for installing a new type impermeable steel integral type nozzle as claimed in claim 5,
in step S4, the center of the monoblock nozzle deviates from the center of the brick cup by no more than 1 mm.
7. A novel anti-seepage steel integral type nozzle comprises a nozzle body (2) arranged in a brick cup (1) and a nozzle bowl part (3), and is characterized in that,
the water gap bowl part (3) is arranged above the water gap body (2), and the water gap bowl part (3) and the water gap body (2) are integrally formed;
a high-alumina fire clay layer (4) is coated on the part, which is in contact with the brick cup (1), of the lower end of the nozzle body (2);
and an aluminum-chromium refractory mud layer (5) is coated on the part, contacting with the brick cup (1), of the upper end of the nozzle body (2).
8. A new impermeable steel unitary nozzle as claimed in claim 7,
the outer wall of the upper end of the water gap body (2) is provided with at least two circles of grooves (21).
9. A new impermeable steel unitary nozzle as claimed in claim 8,
the thickness of a high-alumina fire clay layer (4) coated on the part of the lower end of the nozzle body (2) contacting with the brick cup (1) is not more than 2 mm.
10. A new impermeable steel unitary nozzle as claimed in claim 9,
the grain diameter of the aluminum-chromium refractory mortar smeared on the part, which is in contact with the brick cup (1), of the upper end of the nozzle body (2) is less than 200 meshes.
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| CN114769572A (en) * | 2022-04-22 | 2022-07-22 | 阳春新钢铁有限责任公司 | Masonry for preventing backflow of molten steel tank nozzle and method thereof |
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