CN115041672B - Tundish turbulence controller, installation method and argon blowing method for pipeline steel - Google Patents
Tundish turbulence controller, installation method and argon blowing method for pipeline steel Download PDFInfo
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- CN115041672B CN115041672B CN202210686926.5A CN202210686926A CN115041672B CN 115041672 B CN115041672 B CN 115041672B CN 202210686926 A CN202210686926 A CN 202210686926A CN 115041672 B CN115041672 B CN 115041672B
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 title claims abstract description 92
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 239000010959 steel Substances 0.000 title claims abstract description 56
- 229910052786 argon Inorganic materials 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000007664 blowing Methods 0.000 title claims abstract description 22
- 238000009434 installation Methods 0.000 title abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 53
- 238000009423 ventilation Methods 0.000 claims abstract description 25
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 36
- 239000007789 gas Substances 0.000 claims description 24
- 229910052749 magnesium Inorganic materials 0.000 claims description 21
- 239000011777 magnesium Substances 0.000 claims description 21
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 20
- 239000000395 magnesium oxide Substances 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 239000004744 fabric Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 229910052596 spinel Inorganic materials 0.000 claims description 9
- 239000011029 spinel Substances 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 6
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 3
- 238000013003 hot bending Methods 0.000 claims description 3
- 239000012188 paraffin wax Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000011449 brick Substances 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 6
- 238000011160 research Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001493 electron microscopy Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
-
- 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
- B22D41/02—Linings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a tundish turbulence controller, an installation method and an argon blowing method for pipeline steel, which comprise a turbulence controller body, wherein a circular sleeve core is concentrically arranged at the upper part of an inner cavity of the turbulence controller body along a longitudinal central line, an impact plate and a ventilation ring body are concentrically and sequentially arranged at the bottom of the inner cavity of the turbulence controller body along the longitudinal central line from inside to outside, a circular seam group and an air chamber box are arranged in the ventilation ring body from top to bottom, the air chamber box is positioned at the bottom of the circular seam and communicated with the circular seam, the bottom of the air chamber box is connected with an air inlet pipe, one end of the air inlet pipe is communicated with the air chamber box, and the other end of the air inlet pipe extends out from the side part of the turbulence controller body. The tundish turbulence controller can effectively reduce the entering of slag and inclusions into a pouring area, and more effectively promote the uniformity of molten steel components and temperature; meanwhile, the bottleneck problem that the tundish turbulence controller is difficult to prolong the service life is solved, and the continuous casting time of the continuous casting tundish is greatly prolonged.
Description
Technical Field
The invention relates to a tundish turbulence controller, an installation method and an argon blowing method for steel for pipelines, and belongs to the technical field of preparation of steel for submarine oil and gas pipelines.
Background
In the development of marine resources, in particular oil and gas resources, the importance of subsea pipelines is highlighted, and the harsh marine environment places higher quality demands on subsea pipelines than on land pipelines. X80 steel is a high strength steel for pipelines, but when applied in marine environments, there is a higher requirement for inclusion control in the steel. The existing casting blank production process flow comprises the following steps: molten iron pretreatment-converter smelting-LF refining-RH refining-slab continuous casting, short continuous casting time of a continuous casting tundish, and high technical difficulty in inclusion control, and causes high production cost.
The continuous casting tundish not only has the functions of stabilizing and dividing flow, but also plays an important role in removing molten steel inclusions, homogenizing molten steel components and temperature, and the removing effect of the inclusions in the molten steel in the continuous casting tundish depends on the flowing state of the molten steel to a great extent. The existing continuous casting tundish metallurgical technology is characterized in that a turbulence controller, a retaining wall, a dam and other flow control devices are generally arranged in the tundish, or a tundish argon blowing metallurgical technology such as a tundish mounting air brick and an air curtain retaining wall is additionally arranged, so that the flowing state of molten steel in the continuous casting tundish can be improved, and the purifying effect is realized on the molten steel in the tundish.
The Chinese patent document CN 103990786A (201410209232.8) discloses a device and a method for removing molten steel inclusions in a tundish of a double-flow slab caster, wherein a first retaining dam, a second retaining dam and retaining walls are sequentially arranged between a water inlet of one tundish and a turbulence controller at intervals in parallel, the height of the second retaining dam is higher than that of the first retaining dam, air curtain air bricks are symmetrically arranged between the turbulence controller and the retaining walls on two sides of the turbulence controller, the two air curtain air bricks are arranged on the periphery of the turbulence controller in an inverted-eight shape, the device is used for completely removing inclusions with equivalent diameter larger than 50 mu m in a continuous casting blank, and the quantity of tiny inclusions with equivalent diameter smaller than 50 mu m in the continuous casting blank is reduced by more than 50% compared with that in a continuous casting blank produced by using a device provided with the turbulence controller, the retaining walls and the retaining dams in the tundish of the double-flow slab caster. However, the patent has the defects that the two ends of the air curtain air brick are provided with bubble dead areas, the inclusion removal rate is influenced, the flow control device in the tundish and the air curtain air brick are separately arranged and installed, the construction difficulty and working hours are increased, the turnover use of the tundish is influenced, and the like. Chinese patent document CN 103990787A (201410209515.2) discloses a device and a method for removing molten steel inclusions in a continuous casting tundish, comprising a turbulence controller, air curtain air bricks, a retaining wall and a retaining dam, wherein the air curtain air bricks are positioned between the turbulence controller and the retaining wall and are fixed on a permanent lining of the bottom of the tundish. The patent technology enables inclusions with equivalent diameter larger than 50 mu m in the continuous casting billet to be basically removed, the quantity of tiny inclusions with equivalent diameter smaller than 50 mu m in the continuous casting billet is reduced by more than 60% than that of the tundish under the condition of combined use of a turbulence controller, a retaining wall and a retaining dam, and is reduced by more than 30% than that of the tundish under the condition of combined use of the turbulence controller and an air curtain air brick. However, this patent technique has the following disadvantages: the air curtain air brick argon blowing flow is large, and the flow control device and the air curtain air brick are arranged and installed separately in the tundish, so that the construction difficulty and working hours are increased, and the turnover use of the tundish is affected.
As can be seen, existing tundish turbulence controllers have the following problems or disadvantages in production applications: the installation process is complex, the construction difficulty and the working hour are increased, and the turnover use of the tundish is affected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a tundish turbulence controller, an installation method and an argon blowing method for pipeline steel. According to the invention, the annular circular seam is arranged in the inner cavity of the turbulence controller, and in the argon blowing process, the upward argon bubbles inhibit the downward speed of the large ladle pouring flow, weaken the turbulence degree of molten steel, effectively reduce the entering of slag and inclusions into a pouring area, more effectively promote the uniformity of molten steel components and temperature, and improve the cleanliness and homogenization of molten steel. Meanwhile, the annular gap is arranged, so that the bottleneck problem that the turbulence controller is difficult to prolong the service life is solved, and the continuous casting time of the continuous casting tundish is greatly prolonged.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a tundish turbulence controller comprises a turbulence controller body, wherein the upper part of an inner cavity of the turbulence controller body is concentrically provided with a circular sleeve core along a longitudinal central line, the bottom of the inner cavity of the turbulence controller body is concentrically provided with an impact plate and a ventilation ring body from inside to outside in sequence along the longitudinal central line,
the ventilation ring body is internally provided with a circular seam group and an air chamber box from top to bottom, wherein the air chamber box is positioned at the bottom of the circular seam and communicated with the circular seam, the bottom of the air chamber box is connected with an air inlet pipe, one end of the air inlet pipe is communicated with the air chamber box, and the other end of the air inlet pipe extends out from the side part of the turbulence controller body.
The other end of the air inlet pipe sequentially penetrates through the bottom of the ventilation ring body and the sleeve embedded in the turbulence controller body from inside to outside.
Preferably, the circular seam group consists of 2-4 coaxial circular seams which are uniformly arranged and penetrate through the top surface of the ventilation ring body, wherein the width of each circular seam is 0.12-0.15 mm, the height h is 60-90 mm, and the distance a between two adjacent circular seams is 10-20 mm. The distance b between the outer side of the circular seam group and the inner wall of the sleeve core is 30-50 mm. Each ring of annular slits is discontinuous, each ring of interlinked slits is provided with 4-6 annular slit intervals which are uniformly arranged, the cross section of each annular slit interval is in a sector ring shape, and the central angle beta of the sector ring shape is 10-30 degrees.
Preferably, the whole air chamber box is annular, the longitudinal section of the air chamber box is rectangular, the width x of the rectangle is 30-50 mm, the height y is 20-30 mm, and the width x of the air chamber box is larger than the total width of the circular seam group. The top surface of the air chamber box is provided with a circular seam cloth channel, and the shape, the size and the arrangement of the circular seam cloth channel correspond to those of the circular seam.
Preferably, the outer wall of one end of the air inlet pipe is welded on the inner surface of the lower bottom surface of the air chamber box, and the central line of the air inlet pipe points to the center of the turbulence controller body, so that the air inlet pipe can be paved along the corner line CB of the two magnesium wall plates on the outer end surface and the side surface of the impact area of the tundish, and finally extends out of the edge of the tundish.
Preferably, the breathable ring body is formed by casting corundum-spinel castable, and the volume density of the breathable ring body is more than or equal to 2.95g/cm 3 High-temperature flexural strength not less than 12Mpa, high-temperature compressive strength not less than 60Mpa, al 2 O 3 The +MgO content is more than or equal to 92%, cr 2 O 3 The content is more than or equal to 4.0 percent.
Preferably, the whole impact plate is cylindrical, and is formed by adopting magnesium-carbon isostatic compaction, and the volume density of the impact plate is more than or equal to 2.92g/cm 3 The normal temperature compressive strength is more than or equal to 45.4Mpa, the normal temperature flexural strength is more than or equal to 22.9Mpa, the MgO content is more than or equal to 75%, and the C content is 14-15%. The height of the impact plate is the same as the height H of the ventilation ring body.
In the invention, preferably, the sleeve core is integrally in a shape of a round table with a large upper part and a small lower part, a cylindrical through hole is arranged in the middle part, and the sleeve core is produced by adopting a magnesium prefabricated member and a medium-temperature sintering process.
In the invention, preferably, the turbulence controller body is formed by casting a magnesia spinel castable and is burned at a medium temperature. The magnesia spinel castable is produced by the prior art, the MgO content is more than or equal to 71 weight percent, and the volume density is more than or equal to 3.03g/cm 3 The flexural strength (1500 ℃) is more than or equal to 9Mpa.
The invention preferably coats a layer of paraffin on the working surface of the circumferential seam for protecting the ventilation surface and preventing the problems of poor ventilation of the circumferential seam caused by water seepage and seepage.
The invention discloses a turbulent flow controller body, which is characterized in that a circular seam group is annularly arranged in the inner circle of the turbulent flow controller body, the circular seam group comprises 2-4 circular seams, the width of each circular seam is 0.12-0.15 mm, the height h of each circular seam is 60-90 mm, the distance a between two adjacent circular seams is 10-20 mm, the distance b between the outermost side of the circular seam group and the inner wall of a sleeve core is 30-50 mm, the circular seams are discontinuous, each circular seam is provided with 4-6 circular seam intervals which are uniformly arranged, each circular seam interval is in a fan shape, and the fan shape angle beta is 10-30 degrees. The design is verified by a person skilled in the art through a large number of numerical physical simulation research experiments and industrial application experiments, and unexpected technical effects are achieved.
In simulation research experiments, we have unexpectedly found that an annular ring seam group is arranged in the turbulence controller body, bubbles moving upwards are generated after air blowing, and an annular air curtain barrier can be formed in the turbulence controller. When the bale of liquid enters the turbulence controller, the bubbles can be "broken up" to form more, smaller bubbles, while the rising bubbles inhibit the velocity of the liquid flowing down. The interaction of the two components weakens the turbulence degree of the molten steel, improves the flow state of the molten steel in the tundish, prolongs the residence time of the molten steel in the tundish and promotes the floating of the inclusions. Effectively reduces the entering of slag and inclusions into a casting area, and more effectively promotes the uniformity of molten steel components and temperature. The width of the annular seam, the number of the annular seams, the distance a between adjacent annular seams and the distance b between the outer side of the annular seam and the inner wall of the sleeve core of the turbulence controller have direct influence on the argon blowing effect. Through a large number of research experiments and application experiments, the optimal circumferential seam width, the number of the circumferential seams, the distance a between adjacent circumferential seams and the distance b between the outer sides of the circumferential seams and the inner wall of the sleeve core are determined. Meanwhile, in an industrial application test, the technical scheme that the circumferential seams are discontinuous and the circumferential seam intervals are uniformly arranged can effectively eliminate the problems that thermal stress is concentrated at the circumferential seams and peeling is caused, and can greatly improve the service life of the ventilation ring body. Through a large number of researches and application tests, the optimal distribution number, shape and size of the circumferential gaps are determined, the height h of the circumferential gaps is 60-90 mm according to analysis of erosion and scouring conditions of the turbulence controller, and the technical scheme that the annular impact plate is arranged at the bottom of the inner cavity of the turbulence controller body is designed, so that the overall service life of the turbulence controller is prolonged to 24-30 h, and unexpected technical effects are achieved. Compared with other types of ventilation replacement pieces arranged in the turbulence controller, the circular seam group has the advantages of longer service life and high blowing-through rate.
The invention also provides an installation method of the tundish turbulence controller, which comprises the following steps:
(1) After the construction of the tundish working lining is finished, placing the turbulence controller body on the working lining of the tundish impact area, and leading the air inlet pipe to the corner line CB of the two magnesium wall plates on the outer end surface and the side surface of the tundish impact area;
(2) Connecting and paving an air inlet pipeline: according to the turning size and the hot-bending air inlet pipeline, after the air inlet pipeline is connected with an air inlet pipe, the air inlet pipeline is paved along the corner line CB of the two magnesium wallboards on the outer end surface and the side surface of the impact area of the tundish, and finally extends out of the edge of the tundish, and the extending air inlet pipeline is fixed on a platen of the tundish;
(3) Installing and fixing a turbulence controller body, and filling gaps between the tundish impact area working lining and the turbulence controller body, namely filling layers, by adopting waste materials with granularity less than 3mm which are removed after the tundish working lining is removed;
(4) And (3) installing a magnesium wallboard on the upper part of the turbulence controller body, coating the joints of the magnesium wallboard and the turbulence controller body into streamline shapes by adopting magnesium coating, and coating the exposed air inlet pipeline parts into streamline coating outer layers. The long-life continuous casting tundish turbulence controller with the molten steel purification function can be installed and used on line after the tundish working lining is baked.
The air inlet pipe and the air inlet pipeline are made of heat-resistant stainless steel round pipes, and the outer diameters of the air inlet pipe and the air inlet pipeline are 10-12 mm. The magnesia coating is a conventional refractory material and is commercially available.
An argon blowing metallurgical method for producing steel for pipelines by using the tundish turbulence controller comprises the following steps:
before the continuous casting tundish dries, the air inlet pipeline is connected with an external argon gas source, argon gas is opened after the liquid level of molten steel in the continuous casting tundish reaches the normal liquid level, the argon gas flow is controlled at 8-12 NL/min, and after the continuous casting ladle stops pouring, the argon gas is stopped from being blown in.
In the invention, the flow of the argon blowing has direct influence on the argon blowing effect, and through a great amount of researches and application experiments, the optimal argon flow control of 8-12 NL/min is determined.
The invention has the beneficial effects that:
1) According to the tundish turbulence controller, the circular seam group formed by a plurality of circular seams is annularly arranged in the inner circle of the tundish turbulence controller body, and in the argon blowing process, argon bubbles move upwards to form an annular air curtain barrier in the turbulence controller. The large packet stream enters the turbulence controller, which "breaks up" the argon bubbles, forming more, smaller argon bubbles. Meanwhile, the upward floating argon bubbles can also inhibit the descending speed of the pouring flow, and the two interact, so that the degree of turbulent flow formed by molten steel is weakened, and the flowing state of the molten steel in the tundish is improved. The device can prolong the residence time of molten steel in the tundish, promote the floating of inclusions, reduce the entering of slag and inclusions into a pouring area, more effectively promote the uniformity of the components and the temperature of the molten steel, and improve the cleanliness and the homogenization of the molten steel. The invention is applied to the steel X80 for casting production pipelines of slab continuous casting tundish, the number of inclusions in a continuous casting blank is reduced by 25% in the same ratio as that of inclusions in the prior art CN 103990786A (201410209232.8), and the normal argon blowing flow is reduced by more than 60% in the same ratio.
2) In the tundish turbulence controller, the annular gaps in the ventilation ring body are discontinuous, 4-6 annular gap spaces are uniformly arranged in each annular gap, the annular gap is in a fan shape, and the fan-shaped angle beta is 10-30 degrees. The arrangement can effectively eliminate the problem of transverse cutting and peeling of the air brick caused by concentrated thermal stress at the circumferential seam. The invention solves the bottleneck problem of prolonging the service life of the tundish turbulence controller, and the continuous casting time of the tundish is increased by 10 hours compared with the continuous casting time of the tundish by the prior art CN 103990786A (201410209232.8).
3) The top surface of the air chamber box of the tundish turbulence controller is provided with the circular seam cloth channels, the shape, the size and the arrangement of the circular seam cloth channels correspond to those of the circular seam, the circular seam cloth channels are used for internally inserting and internally fixing the lower ends of the plastic strips forming the circular seam, and the circular seam cloth channels are matched with externally inserting and externally fixing the upper ends of the plastic strips correspondingly arranged to form the circular seam, so that the preparation mould and the preparation process of the continuous casting tundish turbulence controller are simplified.
4) According to the installation method of the tundish turbulence controller, the air inlet pipeline is paved along the corner line CB of the two magnesium wall plates at the outer end face and the side face of the impact area of the tundish, and the paving process is simple, safe and reliable. The problems that the existing air inlet pipeline is not firm in paving, steel penetration of the tundish working lining is easy to occur, melting loss of the air inlet pipeline and the like are solved, and the safety and reliability of the air inlet pipeline and the tundish working lining are improved.
Drawings
FIG. 1 is a cross-sectional view of a tundish turbulence controller according to an embodiment of the present invention.
Fig. 2 is a top view of the tundish turbulence controller structure in accordance with an embodiment of the present invention.
Fig. 3 is a schematic view of the air chamber box and the circular seam distribution channel structure of the tundish turbulence controller according to the embodiment of the invention.
Fig. 4 is a top plan view of a tundish turbulence controller according to an embodiment of the present invention.
Fig. 5 is an enlarged view of a tundish turbulence controller installation F in accordance with an embodiment of the present invention.
FIG. 6 is a cross-sectional view of a tundish turbulence controller installation A-A in an embodiment of the invention.
In the figure, 1. A turbulence controller body; 2. a sleeve core; 3. a circular seam group; 4. a ventilation ring body; 5. an impingement plate; 6. an air chamber box; 7. an air inlet pipe; 8. a sleeve; 9. circular seam spacing; 10. circular seam cloth path; 11. an air intake line; 12. magnesium wallboard; 13. a tundish working liner; 14. and (5) a filling layer.
Detailed Description
The present invention will be further described with reference to the drawings and examples, but the protection of the present invention is not limited thereto.
The magnesia spreads in the examples are conventional refractory materials, commercially available products.
Example 1:
a turbulence controller for continuous casting tundish, whose structure is shown in figures 1-6, comprises a turbulence controller body 1, a ring-shaped sleeve core 2 is concentrically arranged on the upper part of the inner cavity of the turbulence controller body 1 along the longitudinal center line, a cylindrical impact plate 5 and a ventilation ring body 4 are concentrically and sequentially arranged on the bottom of the inner cavity of the turbulence controller body 1 along the longitudinal center line from inside to outside,
the inside top-down of ventilative ring body 4 is provided with circular seam group 3, air chamber box 6 be located the bottom of circular seam group 3 to with circular seam intercommunication, the bottom of air chamber box 6 is connected with intake pipe 7, the one end and the air chamber box 6 intercommunication of intake pipe 7, the other end passes the sleeve pipe 8 that ventilative ring body 4's bottom, turbulent flow controller body 1 buries in proper order from inside to outside, stretches out from the lateral part of turbulent flow controller body.
The circular seam group 3 consists of 3 coaxial circular seams which are uniformly arranged, the circular seams penetrate through the top surface of the ventilation ring body 4, the width of each circular seam is 0.14mm, the height h of each circular seam is 70mm, the distance a between two adjacent circular seams is 15mm, and the distance b between the outer side of the circular seam group and the inner wall of the sleeve core 2 is 40mm. The circular seam is discontinuous and consists of a plurality of circular arc slits penetrating through the top surface of the ventilation ring body 4, and the circular arc slits are uniformly distributed along the circumference by taking the longitudinal center line of the inner bottom as the center. Each ring of circular seam is provided with 6 ring seam intervals 9 which are uniformly arranged, the cross section of each ring seam interval 9 is in a sector ring shape, and the central angle beta of the sector ring shape is 20 degrees. The circular seam group 3 is positioned at the central part of the ventilation ring body 4, namely the distance between the outermost side of the circular seam group 3 and the outer wall of the ventilation ring body 4 is the same as the distance between the innermost side of the circular seam group 3 and the outer wall of the ventilation ring body 4.
The whole air chamber box 6 is circular, the longitudinal section of the air chamber box 6 is rectangular, the width x of the rectangle is 40mm, the height y of the rectangle is 25mm, the top surface of the air chamber box 6 is provided with a circular seam cloth channel 10, and the shape, the size and the arrangement of the circular seam cloth channel 10 correspond to those of the circular seam 3. The circular seam cloth channel can be used for the inner penetration and inner fixation of the lower end of the plastic strip for forming the circular seam. The ventilation ring body 4 with the circular seam group is provided with a plastic strip which can be burnt out in the casting molding process, the plastic strip is carbonized out in the burning molding process to form a slit, the plastic strip is arranged at the corresponding slit, and slit plates are arranged at the upper end and the lower end of the casting molding die for inserting and fixing the plastic strip. The preparation and forming process of the slit is the prior art.
The outer wall of intake pipe 7 one end welds on the internal surface of the lower bottom surface of air chamber box 6, and the central line of intake pipe 7 points to the center of turbulence controller body 1 for intake pipe 7 leads the corner line CB of middle package impact zone outer end face and side two magnesian wallboard 12, and lays along corner line CB, stretches out from middle package edge at last.
The breathable ring body 4 adopts corundum-spinel castableCasting to form the product with volume density not less than 2.95g/cm 3 High-temperature flexural strength not less than 12Mpa, high-temperature compressive strength not less than 60Mpa, al 2 O 3 The +MgO content is more than or equal to 92%, cr 2 O 3 The content is more than or equal to 4.0 percent.
The impact plate 8 is cylindrical and is formed by magnesium-carbon isostatic compaction, and the volume density is more than or equal to 2.92g/cm 3 The normal temperature compressive strength is more than or equal to 45.4Mpa, the normal temperature flexural strength is more than or equal to 22.9Mpa, the MgO content is more than or equal to 75%, and the C content is 14-15%. The height of the impact plate is the same as the height H of the ventilation ring body 4, and h+y=70mm+25mm=95 mm.
The whole sleeve core 2 is in a truncated cone shape with a large upper part and a small lower part, a cylindrical through hole is arranged in the middle of the sleeve core, and the sleeve core is produced by adopting a magnesium prefabricated member and a medium-temperature sintering process.
The turbulence controller body 1 is formed by casting a magnesia spinel castable and is sintered at a medium temperature. The magnesia spinel castable is produced by the prior art, the MgO content is more than or equal to 71 weight percent, and the volume density is more than or equal to 3.03g/cm 3 The flexural strength (1500 ℃) is more than or equal to 9Mpa.
The working surface of the circular seam is coated with a layer of paraffin for protecting the ventilation surface and preventing the problems of poor ventilation of the circular seam caused by water seepage and material seepage.
The installation method of the continuous casting tundish turbulence controller comprises the following steps:
(1) After the construction of the tundish working lining 13 is finished, placing the turbulence controller body 1 on the tundish impact area working lining 13, and leading the air inlet pipe 7 to the corner line CB of the outer end surface and the side two-magnesium wallboard 12 of the tundish impact area;
(2) Connecting and paving an air inlet pipeline 11: according to the turning size and the hot bending air inlet pipeline 11, after the air inlet pipeline 11 is connected with the air inlet pipe 7, the air inlet pipeline 11 is paved along the corner line CB of the two magnesium wall plates 12 on the outer end face and the side face of the impact area of the tundish, finally the air inlet pipeline 11 extends out from the edge of the tundish, and the extending air inlet pipeline 11 is fixed on a pressing plate of the tundish in an iron wire fastening or steel bar welding mode;
(3) Installing and fixing the turbulence controller body 1, and filling the filling layer 14 by adopting the removed waste with granularity less than 3mm after removing the tundish working lining;
(4) The magnesium wallboard 12 is arranged on the upper part of the turbulence controller body 1, the magnesium coating is used for coating the joints of the magnesium wallboard 12 and the turbulence controller body 1 into streamline shapes, and the exposed part of the air inlet pipeline 11 is coated into the streamline coating outer layer. The long-life continuous casting tundish turbulence controller with the molten steel purification function is installed, and the tundish working lining 13 can be used on line after being baked.
According to the invention, the air inlet pipe 7 and the air inlet pipeline 11 are made of heat-resistant stainless steel round pipes, and the outer diameters of the air inlet pipe and the air inlet pipeline are 11mm. The magnesia coating is a conventional refractory material and is commercially available.
An argon blowing metallurgical method for producing pipeline steel X80 by using the continuous casting tundish turbulence controller according to the embodiment comprises the following steps:
before the continuous casting tundish dries, the air inlet pipeline 11 is connected with an external argon gas source, argon gas is opened after the liquid level of molten steel in the continuous casting tundish reaches a normal liquid level, the argon gas flow is controlled at 10NL/min, and after the continuous casting ladle stops pouring, the argon gas is stopped from being blown in.
Example 2
A continuous casting tundish turbulence controller as in example 1, except that:
the number of the rings of the ring seam group 3 is 2, the width of each ring of ring seam is 0.15mm, the height h of each ring seam is 60mm, the distance a between adjacent ring seams is 20mm, and the distance b between the outer side of the ring seam group 3 and the inner wall of the sleeve core 2 is 30mm. Each annular seam is provided with 4 annular seam intervals 9 which are uniformly arranged, and the fan-shaped annular angle beta is 10 degrees.
The width x of the air chamber box 6 is 30mm, and the height y is 20mm. The outer diameters of the air inlet pipe 7 and the air inlet pipeline 11 are 10mm.
An argon blowing metallurgical method for producing pipeline steel X80 by using the continuous casting tundish turbulence controller according to the embodiment comprises the following steps:
before the continuous casting tundish dries, the air inlet pipeline 11 is connected with an external argon gas source, argon gas is opened after the liquid level of molten steel in the continuous casting tundish reaches a normal liquid level, the argon gas flow is controlled at 8NL/min, and after the continuous casting ladle stops pouring, the argon gas is stopped from being blown in.
Example 3
A continuous casting tundish turbulence controller as in example 1, except that:
the number of the rings of the ring seam group 3 is 4, the width of each ring of ring seam is 0.12mm, the height h of each ring seam is 90mm, the distance a between adjacent ring seams is 10mm, and the distance b between the outer side of the ring seam group 3 and the inner wall of the sleeve core 2 is 50mm. Each annular slot is provided with 6 annular slot intervals 9 which are uniformly arranged, and the fan-shaped annular angle beta is 30 degrees.
The width x of the air chamber box 6 is 50mm, and the height y is 30mm. The outer diameters of the air inlet pipe 7 and the air inlet pipeline 11 are 12mm.
An argon blowing metallurgical method for producing pipeline steel X80 by using the continuous casting tundish turbulence controller according to the embodiment comprises the following steps:
before the continuous casting tundish dries, the air inlet pipeline 11 is connected with an external argon gas source, argon gas is opened after the liquid level of molten steel in the continuous casting tundish reaches a normal liquid level, the argon gas flow is controlled at 12NL/min, and after the continuous casting ladle stops pouring, the argon gas is stopped from being blown in.
The multifunctional continuous casting tundish turbulence controller can be used for various continuous casting tundish, is especially suitable for steel types with strict inclusion control, and is preferably but not limited to X42-X80 steel for pipelines.
Comparative example 1
An apparatus and a method for removing molten steel inclusions in a tundish of a dual-flow slab caster, as described in example 1 of chinese patent document CN 103990786A (201410209232.8), and a method for removing molten steel inclusions in a tundish of a dual-flow slab caster as described in example 4, wherein the argon blowing flow of an air curtain air brick is controlled at 30NL/min when the molten steel level is normally poured in the tundish.
For the device and method for removing the molten steel inclusions in the tundish of the double-flow slab caster of examples 1 to 3 and comparative example 1, comparative analysis was applied to the tundish of the slab caster of the steel mill of Yinshan section steel Co Ltd in Laiwu iron and Steel group for producing steel X80 for pipelines, casting blank samples with the length and width of 30mm were taken respectively, and the number of inclusions was analyzed by electron microscopy, and the comparative results are shown in Table 1.
TABLE 1
By comparing the data in the table, the invention reduces the number of inclusions in the pipeline steel X80 continuous casting blank by 25% in the same ratio as the number of inclusions in the pipeline steel X80 continuous casting blank by 60% in the same ratio as the normal argon blowing flow by 10h in the same ratio as the prior art CN 103990786A (201410209232.8), and improves the continuous casting time of the tundish by 10h in the same ratio.
Claims (6)
1. A turbulence controller of a continuous casting tundish is characterized by comprising a turbulence controller body (1), wherein a circular sleeve core (2) is concentrically arranged on the upper part of an inner cavity of the turbulence controller body (1) along a longitudinal central line, an impact plate (5) and a ventilation ring body (4) are concentrically and sequentially arranged on the bottom of the inner cavity of the turbulence controller body (1) along the longitudinal central line from inside to outside,
the air-permeable ring comprises an air-permeable ring body (4), a circular seam group (3) and an air chamber box (6) are arranged in the air-permeable ring body (4) from top to bottom, the air chamber box (6) is positioned at the bottom of the circular seam group (3) and is communicated with the circular seam group (3), the bottom of the air chamber box (6) is connected with an air inlet pipe (7), one end of the air inlet pipe (7) is communicated with the air chamber box (6), and the other end sequentially penetrates through the bottom of the air-permeable ring body (4) and a sleeve embedded in the turbulence controller body (1) from inside to outside and stretches out from the side part of the turbulence controller body (1);
the circular seam group (3) consists of 2-4 coaxial circular seams which are uniformly arranged and penetrate through the top surface of the ventilation ring body (4); the width of each ring of circular seam is 0.12-0.15 mm, the height h of each ring of circular seam is 60-90 mm, the distance a between every two adjacent rings of circular seams is 10-20 mm, and the distance b between the outer side of the circular seam group (3) and the inner wall of the sleeve core (2) is 30-50 mm;
each circular seam is discontinuous, 4-6 circular seam intervals (9) which are uniformly distributed are arranged on each circular seam, the cross section of each circular seam interval (9) is in a sector ring shape, and the central angle beta of the sector ring shape is 10-30 degrees.
2. Tundish turbulence controller according to claim 1, characterized in that the width x of the plenum box (6) is larger than the total width of the circumferential set (3);
the whole air chamber box (6) is annular, the longitudinal section of the air chamber box (6) is rectangular, the width x of the rectangle is 30-50 mm, and the height y is 20-30 mm;
the top surface of the air chamber box (6) is provided with a circular seam cloth channel (10), and the shape, the size and the arrangement of the circular seam cloth channel (10) correspond to those of the circular seam group (3).
3. Tundish turbulence controller according to claim 1, characterized in that the impingement plate (5) is entirely cylindrical and has the same height H as the gas permeable ring body (4).
4. Tundish turbulence controller according to claim 1, characterized in that the gas permeable ring body (4) is cast from corundum-spinel castable with a bulk density of 2.95: 2.95g/cm or more 3 High-temperature flexural strength not less than 12Mpa, high-temperature compressive strength not less than 60Mpa, al 2 O 3 The +MgO content is more than or equal to 92%, cr 2 O 3 The content is more than or equal to 4.0 percent;
the impact plate (5) adopts magnesium-carbon isostatic compaction, and the volume density is more than or equal to 2.92g/cm 3 The normal-temperature compressive strength is more than or equal to 45.4Mpa, the normal-temperature flexural strength is more than or equal to 22.9Mpa, the MgO content is more than or equal to 75%, and the C content is 14-15%;
the whole sleeve core (2) is in a shape of a round table with a large upper part and a small lower part, a cylindrical through hole is arranged in the middle of the sleeve core, and the sleeve core is produced by adopting a magnesium prefabricated member and a medium-temperature sintering process;
the turbulence controller body (1) is formed by casting a magnesia spinel castable and is sintered at a medium temperature; the magnesia spinel castable is produced by the prior art, the MgO content is more than or equal to 71 and wt percent, and the volume density is more than or equal to 3.03 and g/cm 3 The flexural strength (1500 ℃) is more than or equal to 9Mpa.
5. The method for installing a turbulence controller for a continuous casting tundish according to any one of claims 1 to 4, comprising the steps of:
1) After the construction of the tundish working lining (13) is finished, placing the turbulence controller body (1) on the working lining of the tundish impact area, and leading the air inlet pipe (7) to the corner line CB of the outer end surface and the side two magnesium wall plates (12) of the tundish impact area;
2) Connecting and laying an air inlet pipeline (11): according to turning sizes and hot-bending air inlet pipelines, after the air inlet pipelines (11) are connected with an air inlet pipe (7), the air inlet pipelines (11) are paved along the corner line CB of the two magnesium wallboards (12) on the outer end face and the side face of the impact area of the tundish, and finally extend out of the edge of the tundish, and the extended air inlet pipelines (11) are fixed on a pressing plate of the tundish;
3) Installing and fixing a turbulence controller body (1), and filling gaps between the tundish working lining (13) and the turbulence controller body (1), namely a filling layer (14), by adopting waste materials with granularity less than 3mm which are removed after the tundish working lining is removed;
4) And a magnesium wallboard (12) is arranged on the upper part of the turbulence controller body (1), and the magnesium coating is used for coating the joints of the magnesium wallboard (12) and the turbulence controller body (1) into streamline shapes, and the exposed air inlet pipeline (11) is coated into the streamline coating outer layer.
6. An argon blowing metallurgical method for producing steel for pipelines by using the tundish turbulence controller according to any one of claims 1-4, characterized in that the working surface of the circular seam group (3) is coated with a layer of paraffin, comprising the following steps: before the continuous casting tundish dries, an air inlet pipeline (11) is connected with an external argon gas source, argon gas is opened after the liquid level of molten steel in the continuous casting tundish reaches a normal liquid level, the flow of the argon gas is controlled to be 8-12 NL/min, and after the continuous casting ladle stops pouring, the blowing of the argon gas is stopped.
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