CN113399660A - Flow distribution type tundish and pouring system for thin strip continuous casting - Google Patents
Flow distribution type tundish and pouring system for thin strip continuous casting Download PDFInfo
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- CN113399660A CN113399660A CN202110702763.0A CN202110702763A CN113399660A CN 113399660 A CN113399660 A CN 113399660A CN 202110702763 A CN202110702763 A CN 202110702763A CN 113399660 A CN113399660 A CN 113399660A
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- flow
- tundish
- flow distribution
- distribution type
- ladle
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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
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
Abstract
The invention discloses a flow distribution type tundish and a pouring system for thin strip continuous casting. The weir, the dam and the water distribution flow port module are arranged in the flow distribution type tundish, so that the molten steel can be uniformly distributed. In the casting process, after molten steel enters the flow distribution type tundish from the ladle, the liquid level climbs and then passes over the dam top, and then flows out uniformly through the flow distribution water port module and then enters a molten pool between the rollers. Under reasonable dam parameters, the invention improves the temperature uniformity of the distribution molten steel, reduces the risk of blockage of the edge distribution water outlet, further improves the temperature uniformity of the molten steel in the molten pool, and can play a role in optimizing the plate shape. According to the invention, the even distribution of the molten steel before entering the double-roller continuous casting system can be completed by adopting a ladle-flow distribution type tundish system, and compared with the three-ladle casting system of a ladle, a tundish and a transition ladle which are widely used at present, the temperature loss of the molten steel in the flow distribution system is greatly reduced.
Description
Technical Field
The invention belongs to the field of thin strip continuous casting, and particularly relates to a flow distribution type tundish and a pouring system for thin strip continuous casting.
Background
The thin strip continuous casting technology is a novel thin strip steel production technology, and compared with the traditional hot rolling technology, the production line has the advantages of small floor area, low energy consumption, low carbon emission and the like. Different from the traditional continuous casting, the strip continuous casting process adopts a pair of copper casting rolls with built-in water cooling systems to replace a crystallizer in the traditional continuous casting process, molten steel forms a molten pool between the casting rolls, and the molten steel is solidified on the surfaces of the casting rolls along with the opposite rotation of the casting rolls and forms a solid casting strip below the casting rolls.
To form a cast strip of uniform thickness and good plate shape, the molten bath should provide good temperature uniformity and a stable flow field. Therefore, the molten steel should be uniformly injected into the molten bath in a plurality of strands in the axial direction over the width of the casting rolls, while ensuring as uniform a temperature as possible between the streams. In order to achieve the purpose, the existing method adopts a three-ladle casting system, namely, molten steel passes through a large ladle and a middle ladle, then passes through a transition ladle with uniform flow distribution function, and finally enters a molten pool of a double-roll continuous casting machine.
In the three-ladle casting system, the transition ladle is a unique design in the thin-strip continuous casting technology, and the distributed liquid outlet holes of the transition ladle play the role of a flow distributor. The molten steel flows out from the distributed liquid outlet holes in a multi-strand state, and the casting can be basically carried out. However, the current three-pack casting system has the following disadvantages in use. Firstly, because the introduction of the transition ladle brings an additional temperature drop compared to conventional continuous casting systems-in order to ensure sufficient superheat of the molten steel, the tapping temperature must be increased with it, which causes additional energy consumption and refractory wear. Secondly, it is not enough to discover the tapping temperature uniformity of each liquid outlet hole in the current thin strip continuous casting production process, and the middle liquid outlet hole has a high tapping temperature, and the edge liquid outlet holes have a risk of cold steel blockage caused by too low temperature of the molten steel, and the above conditions can cause uneven temperature distribution of the molten steel in the molten pool along the width direction of the cast strip, influence the plate shape of the cast strip, and even when the temperature is serious, can also cause the casting to be broken.
Disclosure of Invention
In order to solve the problems, the invention creatively provides a flow distribution type tundish and a pouring system for thin strip continuous casting. The flow distribution type tundish comprises a group of flow distribution water ports distributed along the axial direction of the casting rolls, so that the extra step of transition ladle can be omitted, the temperature drop in the process is reduced, the tapping temperature can be reduced, and the service life of the ladle lining is prolonged. Meanwhile, through the design of the dam and the channel which are reasonably designed in the flow distribution tundish, the temperature difference between the edge steel flow and the central steel flow of the flow distribution water port can be effectively improved, the risk of edge water gap blockage is reduced, the uniformity of the temperature of the steel liquid in a molten pool is improved, the plate shape of a casting belt is optimized finally, and the overall quality of a product is improved.
According to a first aspect of the invention, a flow distribution type tundish for thin strip continuous casting is provided, wherein a long nozzle, a weir, a dam and a water distribution nozzle module are sequentially arranged in the flow distribution type tundish.
According to the flow distribution type tundish for thin strip continuous casting, the internal height of the flow distribution type tundish is preferably 1.5-1.8 m, the internal width of the flow distribution type tundish is preferably 1.0-1.4 m, and the internal length of the flow distribution type tundish is preferably 3.5-5.0 m.
According to the flow distribution type tundish for thin strip continuous casting, the distance between the bottom of the baffle weir and the bottom of the flow distribution type tundish is preferably 150-300 mm.
According to the distribution type tundish for thin strip continuous casting, the height of the dam is preferably configured as follows: and the height difference between the bottom of the baffle weir and the bottom of the flow distribution type tundish is 25-100 mm.
According to the distribution type tundish for thin strip continuous casting, the distribution water port module is preferably embedded in the distribution type tundish.
According to the distribution type tundish for thin strip continuous casting, the distribution water port module preferably comprises a pair of replaceable prefabricated water port modules, and each prefabricated water port module comprises a plurality of distributed liquid outlet holes.
According to the distribution type tundish for thin strip continuous casting, each prefabricated water gap module preferably comprises 8-12 distributed liquid outlet holes.
According to the distribution type tundish for thin strip continuous casting, the distribution type liquid outlet holes are preferably uniformly distributed along the length of each prefabricated water gap module.
According to the distribution type tundish for thin strip continuous casting, the length and/or the number of the distribution type liquid outlet holes are/is preferably adjusted and/or replaced according to the width of the prefabricated water gap module.
According to a second aspect of the present invention there is provided a gating system for thin strip casting, the gating system comprising a tundish and a distribution tundish having the aforementioned features. Molten steel is configured to flow to the flow distribution type tundish through the large ladle and then enter a molten pool of the double-roller continuous casting machine.
Advantageous technical effects
Compared with the prior art, the invention has the advantages that:
(1) the invention can effectively reduce the temperature drop of the molten steel in the casting process. Specifically, in a three-ladle casting system adopted by the existing double-roll thin strip casting and rolling system, molten steel flows through a large ladle, a middle ladle and a transition ladle and then enters a casting roll, and the temperature drop caused by the long flow can be over 80 ℃ through measurement and calculation. After the flow distribution type tundish is adopted, tests show that the temperature drop can be reduced by more than 30 ℃. The effects that can be achieved in this way include: the refining tapping temperature can be reduced, the steel-making treatment period is shortened, the corrosion of molten steel on a steel ladle refractory material is reduced, and the like, so that the production cost is obviously reduced.
(2) The invention can improve the temperature uniformity of the casting roller molten pool and control the maximum temperature difference of each liquid outlet hole of the flow distribution system within 5 ℃. Meanwhile, the liquid outlet temperature of the flow distribution system is obviously increased compared with that of a three-ladle casting system, and the probability of liquid outlet hole blockage caused by too low molten steel temperature is reduced, so that the plate type of the casting belt can be optimized, the convexity of the casting belt is reduced, and the product quality is obviously improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It is to be understood that the drawings in the following description are directed to only some embodiments of the invention and are not intended as a limitation on the invention.
Fig. 1 is a schematic side view of a specific structure of a flow-distribution tundish for strip casting according to an embodiment of the present invention.
Wherein:
1: a long nozzle; 2: a weir is blocked; 3: blocking a dam; 4: a water distribution flow port module; 5: the distance between the baffle weir and the long nozzle; 6: the distance between the bottom of the dam and the bottom of the flow distribution type tundish is increased; 7: the distance between the dam and the dam is kept; 8: the height of the dam.
Fig. 2 is a schematic top view of a prefabricated nozzle module of a distribution tundish for strip casting according to an embodiment of the present invention.
Wherein:
9: prefabricating a water gap module; 10: distributed liquid outlet holes; 11: liquid outlet holes at the edge.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
Referring to fig. 1, a schematic side view of a specific structure of a distribution type tundish for thin strip continuous casting according to an embodiment of the present invention is shown. As shown in fig. 1, a long nozzle 1, a weir 2, a dam 3 and a water distribution nozzle module 4 with distributed liquid outlet holes are arranged in the flow distribution type tundish in sequence.
The bottom of the blocking weir 2 is suspended, the top of the blocking weir 2 is fixed at the top of the flow distribution type tundish, and the distance between the bottom of the blocking weir 2 and the bottom of the flow distribution type tundish is 6-300 mm.
The distance 5 between the baffle weir 2 and the long nozzle 1 is 300-600 mm.
The horizontal distance 7 between the dam 2 and the dam 3 is 200-400 mm.
The height 8 of the dam 3 is higher than the distance 6 between the bottom of the dam 2 and the bottom of the flow distribution type tundish, and the height difference between the dam and the flow distribution type tundish is controlled to be 25-100 mm.
Two prefabricated water gap modules 9 are embedded in the water distribution flow port module 4. 8-12 distributing holes are distributed on each prefabricated water gap module 9.
The specific operation of the distribution type tundish for strip casting according to the present invention is described in detail as follows.
Molten steel enters the flow distribution type tundish through the long nozzle 1 and flows through the bottom of the weir 2. After the liquid level rises to a certain degree, the liquid level crosses the top of the dam 8, and finally flows out of the distribution type tundish through the distribution water hole module 4 with distributed liquid outlet holes to enter the double-roller continuous casting system.
Under the steady state condition of normal casting, the liquid level of the molten steel between the long nozzle 1 and the dam 2 is consistent with the height of the dam 3. Molten steel flowing into the flow distribution type tundish floats impurities in sufficient time, and most of the impurities are blocked by the weir 2 and cannot flow out of the flow distribution type tundish, so that the slag inclusion defect in the casting strip is reduced, and the product quality of the casting strip is improved.
The design of the dam weir ensures that the molten steel is uniformly distributed after passing over the top of the dam 8, the flow field is stable, and the temperature field is uniform. Therefore, compared with the traditional three-ladle casting system applied to twin-roll strip casting, the molten steel does not need to enter the transition ladle again, but directly passes through the water distribution flow port modules 4 embedded in the flow distribution type tundish and is uniformly distributed between the twin-roll continuous casting devices along the axial direction through the distributed liquid outlet holes to form a molten pool.
In the water distribution flow port module 4, the tapping temperature difference of each liquid outlet hole is low. According to this embodiment of the invention, the tapping temperature difference is less than 5 ℃. Meanwhile, the temperature of the molten steel of the liquid outlet holes at the edge part is increased, and the situation that the liquid outlet holes at the edge part are blocked due to cold steel is reduced. According to an embodiment of the invention, the cold steel clogging probability is lower than 1%. Because the tapping temperature difference of the liquid outlet hole is small and the edge part is blocked with low probability, the temperature of the molten steel flowing into the subsequent molten pool is uniformly distributed and cooled along the width direction of the cast strip, so that the plate shape of the cast strip is improved, and the convexity of the cast strip is reduced. According to an embodiment of the invention, the convexity of the cast strip is less than 30 μm.
As can be seen from the above, according to the embodiments of the present invention, the following advantageous technical effects can be achieved: the tapping temperature difference of the liquid outlet holes of the water distribution flow port is reduced, the temperature of the molten steel at the liquid outlet holes at the edge parts is improved, the blocking condition of the liquid outlet holes at the edge parts is reduced, and the temperature uniformity of the molten steel in a molten pool is improved, so that the plate shape of a cast strip can be optimized, and the convexity of the cast strip is reduced. Meanwhile, the design of the transition ladle can fully promote inclusions in molten steel to float upwards, reduce the slag inclusion defect in a cast strip and finally improve the quality of the cast strip product.
The foregoing is directed to embodiments of the present invention and it is noted that various modifications and adaptations of the invention may occur to those skilled in the art without departing from the scope and spirit of the invention.
Claims (10)
1. A flow distribution type tundish for thin strip continuous casting is characterized in that:
the flow distribution type tundish is internally and sequentially provided with a long water gap (1), a dam (2), a dam (3) and a flow distribution water gap module (4).
2. A flow-distributing tundish according to claim 1, wherein:
the internal height of the flow distribution type tundish is 1.5-1.8 m, the internal width is 1.0-1.4 m, and the internal length is 3.5-5.0 m.
3. A flow-distributing tundish according to claim 1, wherein:
the distance (6) between the bottom of the baffle weir (2) and the bottom of the flow distribution type tundish is configured to be 150-300 mm.
4. A flow-distributing tundish according to claim 1, wherein:
the height of the dam (3) is configured as follows: and the height difference between the bottom of the baffle weir (2) and the bottom of the flow distribution type tundish is 25-100 mm, wherein the height difference is between the bottom of the baffle weir and the bottom of the flow distribution type tundish.
5. A flow-distributing tundish according to claim 1, wherein:
the water distribution flow port module (4) is embedded in the flow distribution type tundish.
6. A flow-distributing tundish according to claim 5, wherein:
the distribution water gap module (4) comprises a pair of replaceable prefabricated water gap modules (9), and each prefabricated water gap module (9) comprises a plurality of distributed liquid outlet holes (10).
7. A flow-distributing tundish according to claim 6, wherein:
each prefabricated water gap module (9) comprises 8-12 distributed liquid outlet holes (10).
8. A flow-distributing tundish according to claim 6 or 7, wherein:
the distributed liquid outlet holes (10) are uniformly distributed along the length of each prefabricated water gap module (9).
9. A flow-distributing tundish according to claim 6 or 7, wherein:
the length and/or number of the distributed liquid outlet holes (10) are configured to be adjusted and/or replaced according to the width of the prefabricated water gap module (9).
10. A gating system for thin strip casting, characterized by:
the gating system comprising a ladle and a distribution tundish according to any one of claims 1 to 9, the molten steel being configured to flow through the ladle to the distribution tundish and into the molten bath of the twin roll caster.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110702763.0A CN113399660A (en) | 2021-06-24 | 2021-06-24 | Flow distribution type tundish and pouring system for thin strip continuous casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110702763.0A CN113399660A (en) | 2021-06-24 | 2021-06-24 | Flow distribution type tundish and pouring system for thin strip continuous casting |
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| CN113399660A true CN113399660A (en) | 2021-09-17 |
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| CN202110702763.0A Pending CN113399660A (en) | 2021-06-24 | 2021-06-24 | Flow distribution type tundish and pouring system for thin strip continuous casting |
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| CN111347031A (en) * | 2020-04-02 | 2020-06-30 | 江苏沙钢集团有限公司 | Dam weir type transition ladle for thin strip continuous casting |
| CN111570780A (en) * | 2020-06-30 | 2020-08-25 | 王世泰 | Automatic tundish suspension device and automatic impurity suspension method |
-
2021
- 2021-06-24 CN CN202110702763.0A patent/CN113399660A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201058372Y (en) * | 2007-05-18 | 2008-05-14 | 邯郸钢铁股份有限公司 | Device for controlling flow of ladle |
| CN201261063Y (en) * | 2008-09-27 | 2009-06-24 | 东北大学 | Pouring apparatus for cast-rolling of twin-roll thin strip |
| CN102896285A (en) * | 2011-07-29 | 2013-01-30 | 宝山钢铁股份有限公司 | Method and device for continuously casting thin strip |
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| CN111570780A (en) * | 2020-06-30 | 2020-08-25 | 王世泰 | Automatic tundish suspension device and automatic impurity suspension method |
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