CN115246004A - Tundish capable of preventing covering agent from being involved and using method thereof - Google Patents
Tundish capable of preventing covering agent from being involved and using method thereof Download PDFInfo
- Publication number
- CN115246004A CN115246004A CN202110465281.8A CN202110465281A CN115246004A CN 115246004 A CN115246004 A CN 115246004A CN 202110465281 A CN202110465281 A CN 202110465281A CN 115246004 A CN115246004 A CN 115246004A
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- tundish
- steel
- hole
- molten steel
- pouring
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 92
- 239000010959 steel Substances 0.000 claims abstract description 92
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 31
- 229910052786 argon Inorganic materials 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000007654 immersion Methods 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 22
- 238000007664 blowing Methods 0.000 claims description 15
- 239000011248 coating agent Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims 1
- 230000003647 oxidation Effects 0.000 abstract description 9
- 238000007254 oxidation reaction Methods 0.000 abstract description 9
- 239000002893 slag Substances 0.000 description 13
- 238000009749 continuous casting Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000005096 rolling process Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000012300 argon atmosphere Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- -1 therefore Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
-
- 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
Abstract
The invention relates to a tundish for preventing a covering agent from being involved and a using method thereof. The tundish comprises a tundish body (1), a long nozzle (2), an immersion nozzle (3), a tundish cover (4) and a weir plate (5); the tundish cover is arranged on the opening of the tundish body, and sealing fibers are arranged at the joint of the tundish cover and the opening; the weir plate is fixedly arranged in the tundish body along the vertical direction, the inner part of the tundish body is divided into a mixing area and a pouring area, and the weir plate is provided with a steel through hole (51); a long water gap hole and an auxiliary hole are adjacently arranged on the middle ladle cover above the mixing area, and a long water gap is arranged in the long water gap hole; an argon pipeline (6) is arranged in the tundish cover above the pouring area, and the lower part of the tundish body in the pouring area is provided with an immersion nozzle. The invention can prevent the secondary oxidation of the molten steel without using a covering agent in a pouring area, and simultaneously avoids the problem of covering agent involvement in low-tonnage pouring.
Description
Technical Field
The invention relates to a tundish technology, in particular to a tundish for preventing a covering agent from being involved and a using method thereof.
Background
The continuous casting process flow comprises steel ladles, a tundish, a crystallizer and other equipment. The tundish is a refractory container, and generally comprises a tundish body, a long nozzle, an immersion nozzle and the like, wherein the long nozzle is arranged on the upper side of the tundish body, the immersion nozzle is arranged on the lower side of the tundish body, and molten steel in the ladle enters the tundish from the long nozzle and then enters the crystallizer from the immersion nozzle.
The tundish mainly has the following metallurgical functions:
1. shunting action: for a multi-strand continuous casting machine, molten steel is divided by a multi-nozzle tundish;
2. continuous casting action: when the multi-furnace continuous casting is carried out, the molten steel stored in the tundish plays a role in connection in the ladle changing process;
3. pressure reduction: providing a stable molten steel level in the continuous casting process to reduce the scouring of the solidified shell of the crystallizer by the molten steel flow;
4. secondary oxidation prevention: adding a covering agent to the surface of molten steel in the tundish or adopting technical measures such as argon blowing and the like to reduce the pollution of the molten steel in the tundish by an external oxygen source;
5. removing impurities: the molten steel stays in the tundish for a sufficient time to float and remove the non-metallic inclusion particles in the molten steel.
In the process of pouring the molten steel, particularly in the process of low-tonnage pouring, if the liquid level of the molten steel in the tundish is reduced to a critical liquid level, a vortex is formed above the submerged nozzle, so that a covering agent on the liquid level of the molten steel in the tundish is rolled into the submerged nozzle along the center of the vortex, the quality problem of steel billets is influenced, the yield of the steel billets is reduced, and the production cost is increased. The prior technologies for inhibiting the tundish covering agent from being involved or swirling slag inclusion mainly comprise the following technologies:
1. for example, chinese patent 201510594862.6 discloses a method for preventing slag entrapment in a tundish, which realizes automatic positioning control of the ladle height according to the change of the weight of molten steel in the tundish to reduce the height difference between the bottom of the ladle and the surface of the tundish to the maximum extent, thereby reducing the stirring of the molten steel stream on the tundish molten pool and preventing slag entrapment in the tundish.
2. The optimized stopper rod structure, for example, chinese patent 201810294020.2 discloses a continuous casting slag-rolling-preventing stopper rod, which achieves the purposes of weakening or even offsetting the generation of tundish molten steel confluence vortex and reducing the risk of continuous casting slag rolling by means of the unique shape of a slag-rolling-preventing functional section.
3. The device for inhibiting swirling flow is additionally arranged at a molten steel outlet of a tundish, for example, chinese patent 201120535201.3 discloses a slag rolling prevention cap for a pouring steel opening of the tundish, the slag rolling prevention cap is in a hat shape, the opening end of a helmet is provided with a brim, a fixing rod is arranged on the helmet, and at least two steel inlet holes are obliquely arranged along the middle part of the circumference of the helmet to effectively inhibit molten steel in the tundish at the final stage of pouring from forming a vortex, so that slag rolling is prevented; also, for example, chinese patent 201220546085.X discloses a device for reducing the height of the liquid level of the slag entrapment in a bloom tundish, which mainly comprises a cyclone suppressor, wherein the cyclone suppressor is formed by a cylinder and a platform at the top thereof, the cylinder is in a right-angle shape, the bottom of the cylinder is fixed on a permanent layer at the bottom of the tundish around the water outlet of each tundish, and the platform is positioned right above the water outlet to prevent the slag entrapment in the tundish during the casting process, thereby improving the purity and yield of molten steel.
The principle of the technologies is realized by inhibiting the generation of the vortex, but the problem of the generation of the vortex still exists, so the technologies can only reduce the slag entrapment to a certain extent, and the problem of the slag entrapment of the tundish under the condition of low tonnage cannot be completely avoided.
In addition, the argon blowing technology adopted by the conventional tundish cannot completely isolate air, for example, the Chinese patent 201520435558.2 discloses an argon blowing sealed tundish, the tundish is formed by embedding an argon blowing conduit at the upper part of a permanent layer, and an argon blowing branch pipe penetrates through a working layer to be connected with the argon blowing conduit, so that the argon blowing branch pipe is positioned on the liquid level of steel, therefore, argon atmosphere surrounding and air isolation are realized on the liquid level of the steel, the tundish can isolate air to a certain degree, but the required argon blowing flow is large, and in actual use, the argon cannot completely cover the liquid level of the steel, and secondary oxidation cannot be completely avoided.
Disclosure of Invention
The invention aims to provide a tundish for preventing a covering agent from being involved and a using method thereof.
The invention is realized by the following steps:
a tundish for preventing a covering agent from being involved comprises a tundish body, a long nozzle and an immersion nozzle; the tundish also comprises a tundish cover and a weir plate;
the tundish cover is arranged on the opening of the tundish body, and sealing fibers are arranged at the joint of the tundish cover and the opening; the weir plate is fixedly arranged in the tundish body along the vertical direction, the inner part of the tundish body is divided into a mixing area and a pouring area, and the weir plate is provided with a steel through hole; a long water gap hole and an auxiliary hole are adjacently arranged on the middle ladle cover above the mixing area, and a long water gap is arranged in the long water gap hole; an argon pipeline is arranged in the tundish cover above the pouring area, and the tundish body is provided with an immersion nozzle at the lower part of the pouring area.
The weir plate is arranged at 1/2~1/4 of the length direction of the tundish body and close to the submerged nozzle.
The distance between the steel through hole and the inner bottom surface of the tundish body is 0-300mm.
And the steel through hole is provided with an upward inclination angle from the mixing area to the pouring area.
The inclination angle is 0-80 degrees.
The tundish also comprises a turbulence controller and is arranged at the lower part of the mixing area and at the position corresponding to the long nozzle.
A method of using a tundish to prevent entrapment of a coating agent, the method comprising the steps of: firstly, introducing argon into a pouring area for purging, then pouring molten steel, and enabling the molten steel to enter a mixing area from a long water gap; after the liquid level of the molten steel is higher than the steel through hole, adding a covering agent to the liquid level of the molten steel near the long nozzle through the auxiliary hole; molten steel enters the pouring area from the mixing area through the steel through hole and is discharged out of the tundish through the submerged nozzle.
And adding a covering agent after the liquid level of the molten steel is 50-100mm higher than the steel through hole.
The tundish for preventing the covering agent from being involved comprises a tundish body, a tundish cover, a sealing fiber and a weir plate, wherein the tundish cover and the sealing fiber are arranged at an opening of the tundish body, and the weir plate is arranged in the tundish body to obtain a mixing area and a pouring area, so that a fully sealed space can be realized in the pouring area, the covering agent is not required to be added after molten steel enters the pouring area, secondary oxidation of the molten steel can be prevented only by carrying out blowing by a small amount of argon or blowing argon in advance, and meanwhile, the covering agent can be effectively prevented from being involved into an immersion nozzle during low-tonnage pouring, so that the quality of steel billets cannot be influenced. Secondly, a turbulence controller and a weir plate are arranged in the tundish body, so that a molten steel flow field in the tundish can be effectively controlled, and floating up and removal of impurities in the molten steel are facilitated.
The tundish using method for preventing the covering agent from being involved can avoid using the covering agent in a pouring area based on a fully sealed space which can be realized by the tundish in the pouring area, and can add the covering agent to a mixing area when the liquid level of molten steel in the mixing area is higher than a steel through hole, thereby not only avoiding the problem of secondary oxidation of the molten steel in the mixing area, but also ensuring that the covering agent on the liquid level of the molten steel in the mixing area can not enter the pouring area, and particularly, the problem that the covering agent is involved in a submerged nozzle to cause slag entrapment can not occur when the low-tonnage unsteady pouring is carried out in the pouring area to form molten steel vortex.
Compared with the prior art, the invention has the following beneficial effects: the liquid level of the molten steel in the pouring area does not need to be added with a covering agent, the secondary oxidation of the molten steel can be prevented only by purging a small amount of argon or not purging the argon, the covering agent is effectively prevented from being involved under the condition of low-tonnage pouring, the tundish structure is simple and easy to realize, the quality of steel billets is guaranteed, and the production cost is reduced.
Drawings
FIG. 1 is a schematic view showing the structure of a tundish for preventing a covering agent from being involved in the present invention.
In the figure, 1 tundish body, 11 tundish refractory layers, 2 long nozzles, 3 submerged nozzles, 4 tundish covers, 5 weir plates, 51 steel through holes, 6 argon pipelines and 7 turbulence controllers.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, a tundish for preventing a covering agent from being involved comprises a tundish body 1, a long nozzle 2, a submerged nozzle 3, a tundish cover 4, a weir plate 5, an argon pipeline 6 and a turbulence controller 7. An opening is formed in the upper portion of the tundish body 1, the space inside the tundish body 1 is used for storing molten steel, and the inner side of the tundish body 1 comprises a tundish refractory layer 11.
The tundish cover 4 is arranged on the opening of the tundish body 1, and sealing fibers are arranged at the joint of the tundish cover 4 and the opening. The weir plate 5 is fixed to be set up inside tundish body 1 along vertical direction to ladle body 1 internal partitioning is for mixing area and pouring area. The weir plate 5 is provided with a steel through hole 51, the distance between the steel through hole 51 and the inner bottom surface of the tundish body 1 is preferably 0 to 300mm, the section of the steel through hole 51 can be rectangular or circular, the values of the long side and the wide side of the rectangle are preferably 50 to 300mm, and the diameter of the circle is preferably 50 to 300mm. The steel through hole 51 is provided with an upward inclination angle from the mixing area to the pouring area, and the inclination angle (namely, the included angle between the steel through hole and the horizontal plane) is preferably 0-80 degrees.
The tundish cover 4 above the mixing area is adjacently provided with a long nozzle hole and an auxiliary hole, the long nozzle hole is internally provided with a long nozzle 2, and the auxiliary hole is used for adding a covering agent.
An argon pipeline 6 is arranged in the tundish cover 4 above the pouring area, the argon pipeline 6 comprises a pressure control device and a flow control device, and the tundish body 1 is provided with an immersion nozzle 3 at the lower part of the pouring area. The pouring basket adopts the submerged nozzle slide plate to control the flow so as to replace the stopper rod to control the flow, and the reason for not selecting the stopper rod to control the flow is that the stopper rod flow control mode needs to open a hole on the pouring basket cover for arranging the stopper rod, and the stopper rod needs to vibrate up and down at high frequency in the flow control process so as to control the opening, so that the pouring area can not meet the requirement of complete sealing if the stopper rod flow control is adopted.
From this, the pouring area comprises tundish body 1, tundish cover 4 and weir plate 5 and sealed fibre and constitutes the totally enclosed space, and weir plate 5 lower part sets up logical steel hole 51 with intercommunication mixing area and pouring area, mixing area top because of being provided with long water gap hole and auxiliary hole, therefore the mixing area is not totally enclosed.
The turbulence controller 7 is disposed at the lower part of the mixing zone corresponding to the long nozzle 2, and the weir plate 5 is disposed at 1/2~1/4 of the tundish body 1 in the longitudinal direction and close to the submerged nozzle. Therefore, the molten steel can be effectively controlled by arranging the flow control device such as the turbulence controller, the weir plate and the like in the tundish. The turbulent flow controller can buffer the kinetic energy of the molten steel discharged from the long nozzle to prevent slag entrapment and secondary oxidation caused by the turning of the liquid level of the molten steel near the long nozzle and the exposure of the liquid level, and the turbulent flow controller can enable molten steel streams discharged from the long nozzle to be fully mixed in the turbulent flow controller, thereby being beneficial to the collision and growth of inclusions and improving the floating probability of the inclusions. The weir plate can control the streamline of the molten steel in the tundish, increase the residence time of the molten steel, obtain more reasonable streamline design and also help to float and remove impurities.
According to the tundish for preventing the covering agent from being involved, the use method comprises the following steps:
argon is introduced into the pouring area for blowing, then molten steel is poured, and the molten steel enters the mixing area from the long nozzle 2. Specifically, the working pressure of argon in the production process is preferably 0.1 to 0.9MPa, and the argon blowing quantity is 0 to 50L/min.
And after the liquid level of the molten steel is higher than the steel through hole 51, preferably when the liquid level of the molten steel needs to be higher than the steel through hole by 50-100mm, adding a covering agent to the liquid level of the molten steel near the long nozzle 2 through the auxiliary hole, so that the covering agent uniformly covers the liquid level of the molten steel in a mixing area near the long nozzle. This is because the mixing zone is an unsealed space, and it is still necessary to pass a covering agent to prevent the molten steel from being secondarily oxidized by air, but at the same time, it is necessary to prevent the covering agent from entering the pouring zone.
Molten steel enters the pouring area from the mixing area through the steel through hole 51 and is discharged out of the tundish through the submerged nozzle 3.
The tundish for preventing the covering agent from being involved and the using method thereof can prevent the secondary oxidation of the molten steel only by blowing a small amount of argon or not blowing the argon in the sealed space of the pouring area, avoid the use of the covering agent in the pouring area, and simultaneously prevent the covering agent in the mixing area from entering the pouring area by a proper control means in the pouring process, thereby not only effectively preventing the secondary oxidation of the molten steel, but also solving the problem that the covering agent is involved in the submerged nozzle.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A tundish for preventing a covering agent from being involved comprises a tundish body (1), a long water gap (2) and a submerged water gap (3); the method is characterized in that: the tundish also comprises a tundish cover (4) and a weir plate (5);
the tundish cover (4) is arranged on the opening of the tundish body (1), and sealing fibers are arranged at the joint of the tundish cover (4) and the opening; the weir plate (5) is fixedly arranged inside the tundish body (1) along the vertical direction, the interior of the tundish body (1) is divided into a mixing area and a pouring area, and the weir plate (5) is provided with a steel through hole (51); a tundish cover (4) above the mixing area is adjacently provided with a long water gap hole and an auxiliary hole, and a long water gap (2) is arranged in the long water gap hole; an argon pipeline (6) is arranged in the tundish cover (4) above the pouring area, and the tundish body (1) is provided with an immersion nozzle (3) at the lower part of the pouring area.
2. A tundish according to claim 1, wherein the means for preventing the entrapment of the coating agent comprises: the weir plate (5) is arranged at 1/2~1/4 of the tundish body (1) in the length direction and close to the submerged nozzle (3).
3. A tundish according to claim 1, wherein the tundish is arranged to contain a coating agent, and the tundish comprises: the distance between the steel through hole (51) and the inner bottom surface of the tundish body (1) is 0-300mm.
4. A tundish according to claim 1, wherein the tundish is arranged to contain a coating agent, and the tundish comprises: the steel through holes (51) are provided with upward inclination angles from the mixing area to the pouring area.
5. A tundish according to claim 4, wherein the tundish is arranged to contain a solution of the composition: the inclination angle is 0-80 degrees.
6. A tundish according to claim 1, wherein the tundish is arranged to contain a coating agent, and the tundish comprises: the tundish also comprises a turbulence controller (7) and is arranged at the lower part of the mixing area and at the position corresponding to the long nozzle (2).
7. A method of using a tundish according to claim 1, for preventing a coating agent from being entangled, comprising: the method comprises the following steps: firstly, introducing argon into a pouring area for blowing, and then pouring molten steel, wherein the molten steel enters a mixing area from a long water gap (2); after the liquid level of the molten steel is higher than the steel through hole (51), adding a covering agent to the liquid level of the molten steel near the long nozzle (2) through the auxiliary hole; molten steel enters the pouring area from the mixing area through the steel through holes (51) and is discharged out of the tundish through the submerged nozzle (3).
8. The use method of a tundish according to claim 7, wherein the method comprises: and adding a covering agent after the liquid level of the molten steel is 50-100mm higher than the steel through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110465281.8A CN115246004A (en) | 2021-04-28 | 2021-04-28 | Tundish capable of preventing covering agent from being involved and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110465281.8A CN115246004A (en) | 2021-04-28 | 2021-04-28 | Tundish capable of preventing covering agent from being involved and using method thereof |
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| CN115246004A true CN115246004A (en) | 2022-10-28 |
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| CN202110465281.8A Pending CN115246004A (en) | 2021-04-28 | 2021-04-28 | Tundish capable of preventing covering agent from being involved and using method thereof |
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2021
- 2021-04-28 CN CN202110465281.8A patent/CN115246004A/en active Pending
Patent Citations (9)
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|---|---|---|---|---|
| CN2657824Y (en) * | 2003-11-11 | 2004-11-24 | 谢玉红 | Continuous casting tundish with flow guiding device |
| CN101028650A (en) * | 2007-04-29 | 2007-09-05 | 濮阳濮耐高温材料有限公司 | Intermediate bag with molten metal return-guide and split apparatus |
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