CN114559003A - Method for controlling thickness stability of casting strip in twin-roll thin strip continuous casting - Google Patents
Method for controlling thickness stability of casting strip in twin-roll thin strip continuous casting Download PDFInfo
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- CN114559003A CN114559003A CN202210343154.5A CN202210343154A CN114559003A CN 114559003 A CN114559003 A CN 114559003A CN 202210343154 A CN202210343154 A CN 202210343154A CN 114559003 A CN114559003 A CN 114559003A
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- 238000005266 casting Methods 0.000 title claims abstract description 124
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000009749 continuous casting Methods 0.000 title abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 28
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 230000004044 response Effects 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 abstract description 8
- 238000002425 crystallisation Methods 0.000 abstract 1
- 230000008025 crystallization Effects 0.000 abstract 1
- 230000008569 process Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 241001644084 Cnestus solidus Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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Abstract
The invention relates to casting process control of twin-roll thin strip continuous casting, in particular to a method for controlling the thickness stability of a twin-roll thin strip continuous casting strip. According to the method for controlling the thickness stability of the twin-roll thin strip continuous casting strip, the control model is established by setting the parameters of the thickness of the casting strip, the casting speed, the molten steel temperature of a molten pool, the solidus temperature and the radius of the casting roll, and meanwhile, the casting rolling force of a crystallization roll can be controlled in a combined manner, so that the stability control of the thickness of the casting strip is better realized. The invention applies the model to the casting process control of the twin-roll thin strip casting, and can be particularly used for parameter setting in the initial casting stage and the casting process. On the other hand, the model improves the stability of the thickness of the cast strip, the surface quality of the cast strip and the stability of the subsequent hot rolling through the quick response of the casting speed.
Description
Technical Field
The invention relates to casting process control of twin-roll strip casting, in particular to a method for controlling thickness stability of a casting strip in twin-roll strip casting.
Background
The double-roller thin strip casting and rolling process includes the steps that liquid molten steel enters a molten pool formed by a pair of oppositely rotating casting rollers through a water distribution nozzle, the molten steel is contacted with the surfaces of the casting rollers with lower temperature to form solid blank shells, and the solid blank shells are led out of the surfaces of the casting rollers along with the rotation of the casting rollers to form continuous casting strips.
The thickness stability of the cast strip is critical to the production stability of the thin strip continuous casting line. In particular, the stability of the cast strip is directly related to the surface quality of the cast strip. The thickness of the cast strip fluctuates, and irregular pits are easily formed on the surface of the cast strip. The thickness instability of the cast strip directly affects the subsequent hot rolling. The fluctuation of the thickness of the cast strip affects the rolling force control of hot rolling, the hot rolling reduction control and the like, so that the hot rolling instability is increased sharply.
In the prior art, roll gap control is generally adopted for controlling the thickness of strip steel. However, in the twin roll strip casting process, since the strip is directly solidified from molten steel into a solid shell, it is difficult to control the thickness of the strip through the roll gap of the casting rolls, and it is more difficult to control the stability of the thickness of the strip.
Disclosure of Invention
Based on the above problems in the prior art, the present invention is directed to: a method for controlling thickness stability of a cast strip in twin roll strip casting is provided to improve the thickness stability of the cast strip in twin roll strip casting, thereby improving casting stability and surface quality of the cast strip, and improving stability of subsequent hot rolling.
The inventor finds out through research that: in the twin roll strip casting process, the thickness of the cast strip is influenced by a large number of factors, including: the height of the molten pool formed by the casting rolls, the size of the roll diameter of the casting rolls, the speed at which the casting rolls rotate, the solidification characteristics of the molten steel, the magnitude of the casting force exerted on the casting rolls, and other factors directly affect the thickness of the cast strip emerging from the casting rolls.
In order to maintain the stability of the thickness of the cast strip, the invention establishes a relation model between the thickness of the cast strip and various influence factors based on the influence factors. Thickness stability of the cast strip can be achieved by adjusting the casting speed, and/or adjusting the range of casting forces, based on the model and the desired strip thickness, in rapid and real-time. As described above, this is important for improving the stability of casting, the surface quality of the cast strip, and the stability of hot rolling.
Specifically, the present invention adopts the following technical means.
According to an aspect of the present invention, there is provided a method of controlling thickness stability of a cast strip in twin roll thin strip casting, the method including:
the casting speed v in twin roll strip casting is calculated from the following mathematical expression:
wherein, in formula (1):
the constant alpha is an empirical parameter related to the heat transfer of the casting rolls, the constant beta is an empirical parameter related to the composition of the molten steel, TLIs the molten bath molten steel temperature, TBH is the set casting strip thickness, H is the molten pool height, and R is the casting roll radius.
The method of controlling thickness stability of a cast strip in twin roll strip casting according to the present invention preferably further comprises: and controlling the casting rolling force CF in the casting process to be 2-20 kN.
The method of controlling thickness stability of a cast strip in twin roll strip casting according to the present invention preferably further comprises: and controlling the casting rolling force CF in the casting process to be 2-16 kN.
The method of controlling thickness stability of a cast strip in twin roll strip casting according to the present invention preferably further comprises: and controlling the casting rolling force CF in the casting process to be 4-16 kN.
According to the method for controlling the thickness stability of the cast strip in twin roll strip casting according to the present invention, the empirical parameter α preferably has a value in the range of 1.0 x 10-4～2.0*10-4。
According to the method for controlling the thickness stability of the cast strip in the twin-roll thin strip continuous casting, the empirical parameter beta is preferably in a range of 0.01-1.
According to the method of controlling the thickness stability of the cast strip in twin roll strip casting according to the present invention, it is preferable that the thickness H of the cast strip is set to be in the range of 1.0 to 3.0 mm.
According to the method of controlling the thickness stability of a cast strip in twin roll strip casting of the present invention, it is preferable that the solidus temperature T of molten steelBCalculated from the composition of the molten steel.
According to the method of controlling the thickness stability of a cast strip in twin roll strip casting of the present invention, preferably, the mathematical expression is used for parameter setting at the initial stage of casting and during casting: according to the set thickness H of the casting belt, the real-time height H of the molten pool and the molten steel temperature T of the molten poolLSolidus temperature T of molten steelBThe corresponding casting speed v is set.
The method of controlling thickness stability of a cast strip in twin roll strip casting according to the present invention preferably further comprises: and calculating the casting speed v through the mathematical expression to adjust the casting speed v in real time, and keeping the stability of the actual thickness of the cast strip through quick response.
Advantageous technical effects
Compared with the prior art, the invention has the technical advantages and beneficial technical effects that:
(1) according to the invention, the casting speed is controlled, so that the contact time of molten steel and the casting roll and the solidification time of the molten steel are controlled, the solidification thickness of a solid blank shell in the twin-roll thin strip casting process is further controlled, and the accuracy of controlling the thickness of the cast strip is improved.
(2) The invention establishes the relation between the casting speed and the height of a molten pool, the solidus temperature of the molten steel and the radius of a casting roller, provides the speed control of the molten steel with different components in the casting process, and effectively solves the problem of unstable thickness when different steel types are cast.
(3) The invention establishes the relation between the casting speed and the height of the molten pool, the temperature of the solidus line of the molten steel and the radius of the casting roll, and solves the problem of the thickness fluctuation of the casting strip caused by the height fluctuation of the molten pool.
(4) On the basis of establishing a continuous casting speed model, the invention further controls the content of liquid in the casting strip by controlling the casting rolling force, thereby more effectively realizing the purpose of stably controlling the thickness of the casting strip.
(5) The method for controlling the thickness stability of the cast strip improves the surface quality of the cast strip on the premise of improving the thickness stability of the cast strip, and greatly improves the surface quality of the hot-rolled strip steel and the stability of hot-rolling.
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 view of a twin roll strip casting bath according to an embodiment of the present invention.
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 should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without 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.
In the technical scheme of the invention, the casting speed v of the strip continuous casting is taken as a key control parameter of the casting roll for leading out the thickness of the casting strip, and the thickness H of the casting strip, the height H of a molten pool, the radius R of the casting roll and the molten steel temperature T of the molten pool which are set in the continuous casting process are determinedLSolidus temperature T of the cast molten steelBThe empirical parameter alpha value related to the heat transfer of the casting roll and the empirical parameter beta value related to the composition of molten steel are simultaneously determined, thereby determining the continuous casting speed in the casting process and the casting process
Eventually maintaining the stability of the thickness of the cast strip. On the other hand, the technical scheme of the invention further controls the content of the liquid state in the cast strip by controlling the casting rolling force of the strip continuous casting, thereby more effectively realizing the aim of stably controlling the thickness of the cast strip
Example 1
The set thickness H of the twin-roll thin strip continuous casting strip is 2.0mm, the height H of the casting molten pool is 230mm, the radius R of the casting roll is 545mm, and the molten steel temperature T of the molten poolL1690 ℃ C. solidus temperature T of the cast molten steelBAt 1535 ℃ and an empirical parameter α of 1.6 x 10 related to the heat transfer of the casting rolls-4And an empirical parameter beta related to the composition of the molten steel is 0.13 by the formula
The real-time casting speed v was calculated to be 2.46m/s, while the casting force CF was 4 kN.
In this embodiment 1, the thickness fluctuation of the cast strip is small in the continuous casting process by controlling the casting speed and the casting rolling force in real time, and the stability of the obtained cast strip is improved.
Example 2
The set thickness H of the twin-roll thin strip continuous casting strip is 1.5mm, the height H of the casting molten pool is 195mm, the radius R of the casting roll is 463mm, and the molten steel temperature T of the molten poolLAt 1640 ℃ and the solidus temperature T of the cast molten steelB1448 ℃ C. experience relating to heat transfer of casting rollsParameter α is 1.1 x 10-4And an empirical parameter beta related to the composition of the molten steel is 0.08 by the formula
The real-time casting speed v was calculated to be 1.02m/s, while the casting force CF was 10 kN.
In this embodiment 2, the thickness fluctuation of the cast strip is small in the continuous casting process by controlling the casting speed and the casting rolling force in real time, and the stability of the obtained cast strip is improved.
Example 3
The thickness H of a twin-roll thin strip continuous casting strip is set to be 2.5mm, the height H of a casting molten pool is 158mm, the radius R of a casting roll is 498mm, and the molten steel temperature T of the molten poolLAt 1615 ℃ and the solidus temperature T of the cast molten steelB1489 ℃ and an empirical parameter alpha of 1.5 x 10 related to the heat transfer of the casting rolls-4And an empirical parameter beta related to the composition of the molten steel is 0.3 by the formula
The real-time casting speed v was calculated to be 3.31m/s, while the casting force CF was 16 kN.
In this embodiment 3, the thickness fluctuation of the cast strip is small in the continuous casting process by controlling the casting speed and the casting rolling force in real time, and the stability of the obtained cast strip is improved.
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 method of controlling thickness stability of a cast strip in twin roll strip casting, the method comprising:
the casting speed v in twin roll strip casting is calculated from the following mathematical expression:
wherein, in formula (1):
the constant alpha is an empirical parameter related to the heat transfer of the casting rolls, the constant beta is an empirical parameter related to the composition of the molten steel, TLIs the molten bath molten steel temperature, TBH is the set casting strip thickness, H is the molten pool height, and R is the casting roll radius.
2. The method of claim 1, wherein:
the method further comprises: and controlling the casting rolling force CF in the casting process to be 2-20 kN.
3. The method of claim 2, wherein:
the method further comprises: and controlling the casting rolling force CF in the casting process to be 2-16 kN.
4. The method of claim 3, wherein:
the method further comprises: and controlling the casting rolling force CF in the casting process to be 4-16 kN.
5. The method of claim 1, wherein:
the empirical parameter α has a value in the range of 1.0 x 10-4～2.0*10-4。
6. The method of claim 1, wherein:
the value range of the empirical parameter beta is 0.01-1.
7. The method of claim 1, wherein:
the thickness H of the cast strip is set within the range of 1.0-3.0 mm.
8. The method of claim 1, wherein:
temperature T of solidus of molten steelBCalculated from the composition of the molten steel.
9. The method according to any one of claims 1 to 8, wherein:
the mathematical expression is used for parameter setting in the initial casting stage and the casting process:
according to the set thickness H of the casting belt, the real-time height H of the molten pool and the molten steel temperature T of the molten poolLSolidus temperature T of molten steelBThe corresponding casting speed v is set.
10. The method according to any one of claims 1 to 8, wherein:
the method further comprises the following steps: and calculating the casting speed v through the mathematical expression to adjust the casting speed v in real time, and keeping the stability of the actual thickness of the cast strip through quick response.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210343154.5A CN114559003B (en) | 2022-03-31 | 2022-03-31 | Method for controlling thickness stability of casting belt in twin-roll thin belt continuous casting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210343154.5A CN114559003B (en) | 2022-03-31 | 2022-03-31 | Method for controlling thickness stability of casting belt in twin-roll thin belt continuous casting |
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| CN114559003A true CN114559003A (en) | 2022-05-31 |
| CN114559003B CN114559003B (en) | 2024-01-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118143060A (en) * | 2024-05-11 | 2024-06-07 | 东北大学 | Method and device for predicting and controlling thickness of casting belt, electronic equipment and storage medium |
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| CN1939619A (en) * | 2005-09-29 | 2007-04-04 | 宝山钢铁股份有限公司 | Double-roller and thin-strip continuous casting and rolling-force setting method |
| KR20080022806A (en) * | 2006-09-07 | 2008-03-12 | 주식회사 포스코 | Method for controlling a strip thickness in strip casting process |
| CN101314179A (en) * | 2007-05-28 | 2008-12-03 | 宝山钢铁股份有限公司 | Setting of rolling force of double-roll thin-belt continuous casting and control method thereof |
| CN103273017A (en) * | 2013-05-28 | 2013-09-04 | 东北大学 | Method for measuring heat flux density of double-roller thin-strip continuous casting interface |
| CN112475254A (en) * | 2020-10-28 | 2021-03-12 | 东北大学 | Method and device for controlling pulling speed and casting strip thickness of thin strip continuous casting machine |
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- 2022-03-31 CN CN202210343154.5A patent/CN114559003B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1939619A (en) * | 2005-09-29 | 2007-04-04 | 宝山钢铁股份有限公司 | Double-roller and thin-strip continuous casting and rolling-force setting method |
| KR20080022806A (en) * | 2006-09-07 | 2008-03-12 | 주식회사 포스코 | Method for controlling a strip thickness in strip casting process |
| CN101314179A (en) * | 2007-05-28 | 2008-12-03 | 宝山钢铁股份有限公司 | Setting of rolling force of double-roll thin-belt continuous casting and control method thereof |
| CN103273017A (en) * | 2013-05-28 | 2013-09-04 | 东北大学 | Method for measuring heat flux density of double-roller thin-strip continuous casting interface |
| CN112475254A (en) * | 2020-10-28 | 2021-03-12 | 东北大学 | Method and device for controlling pulling speed and casting strip thickness of thin strip continuous casting machine |
Non-Patent Citations (3)
| Title |
|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118143060A (en) * | 2024-05-11 | 2024-06-07 | 东北大学 | Method and device for predicting and controlling thickness of casting belt, electronic equipment and storage medium |
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