CN111347031B - Dam weir type transition ladle for thin strip continuous casting - Google Patents
Dam weir type transition ladle for thin strip continuous casting Download PDFInfo
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- CN111347031B CN111347031B CN202010254286.1A CN202010254286A CN111347031B CN 111347031 B CN111347031 B CN 111347031B CN 202010254286 A CN202010254286 A CN 202010254286A CN 111347031 B CN111347031 B CN 111347031B
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- liquid outlet
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- weir
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- ladle
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- 230000007704 transition Effects 0.000 title claims abstract description 76
- 238000009749 continuous casting Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 230000000903 blocking effect Effects 0.000 claims abstract description 15
- 238000010079 rubber tapping Methods 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000005266 casting Methods 0.000 claims description 20
- 239000002893 slag Substances 0.000 abstract description 7
- 230000007547 defect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention belongs to the field of steel manufacturing, and relates to a dam type transition ladle for thin strip continuous casting. The invention arranges the combination of the dam and the weir in the transition ladle. Molten steel enters from the transition ladle inlet and then sequentially passes through the weir bottom, the liquid level climbs and then crosses the dam crest, enters the distributed liquid outlet holes of the transition ladle and uniformly flows out of the transition ladle. Under the conditions of reasonable parameters of weir-to-inlet distance, weir height and weir-to-dam distance, the arrangement can effectively reduce the tapping temperature difference of each liquid outlet hole of the transition ladle, improve the temperature of molten steel at the liquid outlet hole at the edge part, reduce the blocking condition of the liquid outlet hole at the edge part, further improve the temperature uniformity of the molten steel in a rear molten pool and optimize the plate type of a cast strip; meanwhile, the dam weir can fully promote inclusions in molten steel to float upwards, reduce slag inclusion of a cast strip and improve the product quality.
Description
Technical Field
The invention belongs to the field of steel manufacturing, and particularly relates to a dam type transition ladle 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 thin strip continuous casting technology has the advantages of low equipment investment, simple production process, low energy consumption, low product cost and the like. The mature thin strip continuous casting technology adopts a three-ladle structure, namely a ladle, a tundish and a transition ladle. Molten steel flows into the tundish from the ladle in sequence, then flows into the transition ladle, finally flows out from the distributed liquid outlet holes in the transition ladle, and enters a subsequent molten pool to form a cast strip. The transition ladle is a unique design in the thin strip continuous casting technology, the distributed liquid outlet holes of the transition ladle play the role of a flow distributor, and the molten steel flows out from the distributed liquid outlet holes in a multi-strand state.
At present, in the production process of strip continuous casting, the tapping temperature at each liquid outlet hole is found to be extremely uneven, the tapping temperature at the middle liquid outlet hole is high, the tapping temperature at the liquid outlet holes at the edge part is low, and the temperature difference exceeds 20 ℃; and the liquid outlet holes at the edge part are always blocked by cold steel due to the low temperature of the molten steel, and the blocking probability is about 5 percent. The condition can cause the temperature distribution of the molten steel in the molten pool along the width direction of the cast strip to be uneven, the plate shape of the cast strip is influenced, and the convexity of the cast strip is more than 50 mu m; in addition, because the capacity of the transition ladle is small, inclusions in molten steel float insufficiently, so that the casting strip product often has the defect of slag inclusion, and the improvement of the product quality is limited.
At present, few patents or applications are provided for transition ladles for strip casting, and the patents or applications are more rare for how to reduce tapping temperature difference at distributed liquid outlets of the transition ladles, reduce blockage of liquid outlets at edges and fully promote floating of inclusions in molten steel.
The invention adds the combination arrangement of the dam and the weir on the basis of the original transition ladle structure, effectively reduces the tapping temperature difference (the temperature difference is less than 8 ℃) of each liquid outlet hole of the transition ladle by reasonably adjusting four parameters of the distance between the dam and the transition ladle inlet, the height of the dam and the distance between the dam and the dam, improves the temperature of the molten steel at the liquid outlet hole at the edge part, reduces the blocking condition of the liquid outlet hole at the edge part (the blocking probability is 1%), further improves the temperature uniformity of the molten steel in a molten pool, and optimizes the casting strip plate type (the casting strip convexity is less than 35 mu m); meanwhile, the slag inclusion defect in the casting strip is reduced, and the product quality of the thin strip continuous casting is improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a weir type transition ladle for continuously casting thin strips. The term "dam-weir type transition ladle" as used herein refers to a transition ladle provided with a dam and a weir. The dam weir type transition ladle can reduce the tapping temperature difference of each liquid outlet hole of the transition ladle, improve the temperature of molten steel at the liquid outlet hole at the edge part, and reduce the blocking condition of the liquid outlet hole at the edge part, thereby improving the temperature uniformity of the molten steel in a molten pool, optimizing the plate shape of a cast strip and reducing the convexity of the cast strip. Meanwhile, the design of the transition ladle can fully promote inclusions in molten steel to float upwards, and reduce the slag inclusion defect in a cast strip, thereby improving the quality of the cast strip product.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
According to one aspect of the invention, a weir type transition ladle for thin strip continuous casting is provided, wherein a transition ladle inlet, a weir, a dam and distributed liquid outlet holes are sequentially arranged in the transition ladle.
According to the weir type transition ladle for the continuous casting of the thin strip, the distance between the weir and the transition ladle inlet is preferably 1/2-3/5 of the distance between the transition ladle inlet and the distributed liquid outlet hole.
According to the weir-type transition ladle for continuous strip casting, the height of the weir is preferably 1/4-1/3 of the internal height of the transition ladle.
According to the weir-type transition ladle for continuous strip casting, the height of the dam is preferably 1/2-2/3 of the internal height of the transition ladle.
According to the weir type transition ladle for the continuous strip casting, the distance between the weir and the dam is preferably 1/8-1/6 of the distance between the transition ladle inlet and the distributed liquid outlet.
According to the weir-type transition ladle for continuous strip casting of the present invention, it is preferable that the level of molten steel between the inlet of the transition ladle and the weir be maintained to be the same as the height of the dam in a steady state condition of normal casting.
According to the weir-type transition ladle for continuous casting of thin strip of the present invention, preferably, the distributed liquid outlet holes include a plurality of intermediate liquid outlet holes and a plurality of edge liquid outlet holes, and a tapping temperature difference between the intermediate liquid outlet holes and the edge liquid outlet holes is less than 8 ℃.
According to the weir-type transition ladle for continuous strip casting, the cold steel blocking probability of the edge liquid outlet holes is preferably not higher than 1%.
According to another aspect of the present invention, a thin strip continuous casting line is provided. The thin strip continuous casting line is equipped with a ladle, a tundish and a transition ladle having any combination of the foregoing features.
According to the strip casting line of the present invention, it is preferable that the cast strip produced by the strip casting line has a crown of less than 35 μm.
Advantageous technical effects
The characteristics and the beneficial technical effects of the invention at least comprise:
the invention can reduce the tapping temperature difference of each liquid outlet hole of the transition ladle, and the temperature difference is less than 8 ℃; the temperature of the molten steel at the liquid outlet hole at the edge part is improved, the blocking condition of the liquid outlet hole at the edge part is reduced, and the blocking probability is 1%; thereby improving the temperature uniformity of the molten steel in the molten pool, optimizing the plate shape of the cast strip, and reducing the convexity of the cast strip, wherein the convexity of the cast strip is less than 35 mu m; meanwhile, the design of the transition ladle can fully promote inclusions in molten steel to float upwards, and reduce the slag inclusion defect in the cast strip, thereby improving the quality of the cast strip product.
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 structural view (top view) of a weir-type transition ladle for thin strip continuous casting according to an embodiment of the present invention.
Fig. 2 is a schematic structural view (side view) of a weir-type transition ladle for strip casting according to an embodiment of the present invention.
Description of the reference numerals
In FIGS. 1-2:
1: a transition packet entry; 2: a weir is blocked; 3: blocking a dam; 4: distributed liquid outlet holes; 5: liquid outlet holes at the edge;
6: the height of the dam; 7: the height of a dam is kept; 8: the spacing between dams and weirs; 9: the distance between the blocking weir and the transition ladle inlet.
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 and 2, a weir-type transition piece for strip casting according to an embodiment of the present invention is shown.
As shown in fig. 1, a transition ladle according to an embodiment of the present invention is provided with a transition ladle inlet 1, a weir 2, a dam 3, and a distributed liquid outlet 4 in sequence.
According to the embodiment of the invention, the distance 9 between the baffle 2 and the transition bag inlet 1 is 1/2-3/5 of the distance between the transition bag inlet 1 and the distributed liquid outlet holes 4.
Still according to the embodiment of the invention, the height 6 of the baffle weir 2 is 1/4-1/3 of the internal height of the transition ladle; the height 7 of the dam 3 is 1/2-2/3 of the internal height of the transition bag; the distance 8 between the blocking weir 2 and the blocking dam 3 is 1/8-1/6 of the distance between the transition bag inlet 1 and the distributed liquid outlet holes 4.
The specific operation of the transition package according to the embodiment of the present invention is exemplarily described as follows.
Referring to fig. 1 or fig. 2, molten steel enters from an inlet 1 of the transition ladle, passes through the bottom of the dam 2, passes over the top of the dam 3 after the liquid level rises, and finally flows out of the transition ladle through the distributed liquid outlet holes 4.
Under the steady state condition of normal casting, the liquid level of the molten steel between the transition ladle inlet 1 and the dam 2 is consistent with the height of the dam 3. According to the embodiment, the molten steel flowing into the transition ladle floats impurities in sufficient time, and most of the impurities are blocked by the blocking weir 2 and cannot flow out of the transition ladle, so that the slag inclusion defect in the cast strip is reduced, and the product quality of the cast strip is improved.
In addition, compared with a transition ladle without a dam weir, the arrangement of the dam weir according to the embodiment of the invention ensures that molten steel passing over the dam top is uniformly distributed, the flow field is stable, the temperature field is uniform, and the tapping temperature difference of each liquid outlet hole is lower. According to the above embodiment, the tapping temperature difference of each tapping hole is less than 8 ℃.
Meanwhile, according to the embodiment of the invention, the temperature of the molten steel of the edge liquid outlet holes 5 is increased, and the condition that the edge liquid outlet holes 5 are blocked due to cold steel is reduced. According to the above example, the cold steel clogging probability in this example is about 1%. Because the tapping temperature difference of the distributed liquid outlet holes 4 is small and the edge part blockage probability is low, the temperature of the molten steel flowing into a subsequent molten pool is uniformly distributed along the width direction of the cast strip, the cooling is uniform, the plate type of the cast strip is improved, and the convexity of the cast strip is reduced. According to the above embodiment, the cast strip crown is less than 35 μm.
In conclusion, the invention can reduce the tapping temperature difference of each liquid outlet hole of the transition ladle, improve the temperature of the molten steel at the liquid outlet holes at the edge part, and reduce the blocking condition of the liquid outlet holes at the edge part, thereby improving the temperature uniformity of the molten steel in a molten pool, optimizing the plate shape of a cast strip and reducing the convexity of the cast strip; meanwhile, the design of the transition ladle can fully promote inclusions in molten steel to float upwards, and reduce the slag inclusion defect in the cast strip, thereby improving 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 (4)
1. A dam type transition ladle for continuous casting of thin strips is characterized in that: transition package entry (1), weir (2), dam (3) and distributed liquid outlet hole (4) have set gradually in the transition package, liquid outlet hole (4) include a plurality of middle liquid outlet holes and a plurality of limit portion go out liquid hole (5), weir (2) with distance (9) between transition package entry (1) do transition package entry (1) with 1/2 ~ 3/5 of distance between distributed liquid outlet hole (4), height (6) of weir (2) are 1/4 ~ 1/3 of the internal height of transition package, height (7) of dam (3) are 1/2 ~ 2/3 of the internal height of transition package, weir (2) with distance (8) between dam (3) are 1/8 ~ 1/6 of distance between transition package entry (1) and distributed liquid outlet hole (4), the tapping temperature difference between the middle liquid outlet hole and the edge liquid outlet holes (5) is less than 8 ℃, and the cold steel blocking probability of the edge liquid outlet holes (5) is not higher than 1%.
2. The transition pack of claim 1, wherein: and under the steady-state condition of normal casting, the liquid level of the molten steel between the transition ladle inlet (1) and the dam (2) is kept consistent with the height of the dam (3).
3. A thin strip continuous casting production line is characterized in that: the thin strip continuous casting line is equipped with a ladle, a tundish and a tundish according to claim 1 or 2.
4. The thin strip casting line of claim 3, wherein: the convexity of the casting strip produced by the thin strip continuous casting production line is less than 35 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010254286.1A CN111347031B (en) | 2020-04-02 | 2020-04-02 | Dam weir type transition ladle for thin strip continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010254286.1A CN111347031B (en) | 2020-04-02 | 2020-04-02 | Dam weir type transition ladle for thin strip continuous casting |
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| Publication Number | Publication Date |
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| CN111347031A CN111347031A (en) | 2020-06-30 |
| CN111347031B true CN111347031B (en) | 2022-02-25 |
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| CN202010254286.1A Active CN111347031B (en) | 2020-04-02 | 2020-04-02 | Dam weir type transition ladle for thin strip continuous casting |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112296285B (en) * | 2020-09-18 | 2022-04-05 | 江苏沙钢集团有限公司 | Method for improving wrinkles of double-roller cast-rolled thin strip |
| CN113399660A (en) * | 2021-06-24 | 2021-09-17 | 江苏沙钢集团有限公司 | Flow distribution type tundish and pouring system for thin strip continuous casting |
| CN115383102A (en) * | 2022-09-16 | 2022-11-25 | 青岛正望新材料股份有限公司 | Transition bag for thin strip continuous casting |
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| JP4424164B2 (en) * | 2004-11-12 | 2010-03-03 | 株式会社Ｉｈｉ | Sealing device for twin roll casting machine |
| 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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| CN103894571A (en) * | 2014-03-28 | 2014-07-02 | 上海大学 | Method of purifying molten steel in tundish by gas vortex and molten steel purification device |
| CN109731914A (en) * | 2019-02-21 | 2019-05-10 | 江苏沙钢集团有限公司 | Rolling method for improving surface quality of double-roller continuous casting rolled strip |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7464746B2 (en) * | 2006-08-09 | 2008-12-16 | Nucor Corporation | Method of casting thin cast strip |
| US9873150B2 (en) * | 2012-09-25 | 2018-01-23 | Baoshan Iron & Steel Co., Ltd. | Method and device for continuous thin strip casting |
| CN202779748U (en) * | 2012-10-24 | 2013-03-13 | 通化钢铁股份有限公司 | Flow control device for sheet billet continuous casting tundish |
| US20140262121A1 (en) * | 2013-03-15 | 2014-09-18 | Nucor Corporation | Method of thin strip casting |
| CN108015243B (en) * | 2016-10-31 | 2019-12-31 | 宝山钢铁股份有限公司 | Blowing flow distribution device for twin-roll thin strip continuous casting |
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- 2020-04-02 CN CN202010254286.1A patent/CN111347031B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4424164B2 (en) * | 2004-11-12 | 2010-03-03 | 株式会社Ｉｈｉ | Sealing device for twin roll casting machine |
| 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 |
| CN103008587A (en) * | 2011-09-28 | 2013-04-03 | 宝山钢铁股份有限公司 | Generation method of anti-oxidation iron sheet by thin strip casting |
| CN103894571A (en) * | 2014-03-28 | 2014-07-02 | 上海大学 | Method of purifying molten steel in tundish by gas vortex and molten steel purification device |
| CN109731914A (en) * | 2019-02-21 | 2019-05-10 | 江苏沙钢集团有限公司 | Rolling method for improving surface quality of double-roller continuous casting rolled strip |
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| CN111347031A (en) | 2020-06-30 |
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