CN114769539A - Method for controlling molten steel flow of sheet billet continuous casting crystallizer - Google Patents
Method for controlling molten steel flow of sheet billet continuous casting crystallizer Download PDFInfo
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- CN114769539A CN114769539A CN202210203092.8A CN202210203092A CN114769539A CN 114769539 A CN114769539 A CN 114769539A CN 202210203092 A CN202210203092 A CN 202210203092A CN 114769539 A CN114769539 A CN 114769539A
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- casting
- crystallizer
- molten steel
- flow
- electromagnetic braking
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000009749 continuous casting Methods 0.000 title claims abstract description 13
- 238000005266 casting Methods 0.000 claims abstract description 52
- 238000003780 insertion Methods 0.000 claims abstract description 20
- 230000037431 insertion Effects 0.000 claims abstract description 20
- 238000007654 immersion Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000005764 inhibitory process Effects 0.000 claims 1
- 230000005499 meniscus Effects 0.000 abstract description 4
- 239000002893 slag Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
Images
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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
- B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
- B22D11/205—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level by using electric, magnetic, sonic or ultrasonic means
Abstract
The invention relates to a method for controlling the flow of molten steel in a sheet billet continuous casting crystallizer, belonging to the technical field of metallurgical control methods. The technical scheme of the invention is as follows: before the molten steel is cast, selecting a corresponding electromagnetic braking control mode according to a production plan; opening the electromagnetic brake device before casting, wherein the electromagnetic brake is always in an open state in the casting process, when the casting speed is monitored to be less than or equal to a set value, the current parameter is 0A, when the casting speed is greater than the set value, the reference current parameter of the electromagnetic brake is controlled, and the control range is 0-900A. The beneficial effects of the invention are: the electromagnetic braking control current is effectively connected with the casting section, the casting speed and the immersion type water gap insertion depth, so that the synchronous dynamic automatic control of the whole system is realized, and the fluctuation of the liquid level of the crystallizer at a meniscus is effectively inhibited; the flow of the molten steel in the crystallizer forms an ideal double-roller flow field, reduces the phenomena of slag entrapment and steel leakage in the process of casting blank solidification, and improves the quality of the casting blank.
Description
Technical Field
The invention relates to a method for controlling the flow of molten steel in a sheet billet continuous casting crystallizer, belonging to the technical field of metallurgical control methods.
Background
At present, a thin slab caster is widely applied in the field of metallurgy, and a crystallizer is continuous casting heart equipment, so that the control of the flowing stability of molten steel in the crystallizer plays an extremely important role in continuous casting production and product quality. Because the thin slab caster has high drawing speed, large steel passing amount and large casting blank width-thickness ratio, the thin slab caster is not beneficial to the uniformity of a temperature field and a flow field of molten steel in the crystallizer during the continuous casting of the thin slab, the flowing of the molten steel in the crystallizer is difficult to form a stable double-roller flow field, and particularly, the fluctuation of the molten steel at the meniscus of the crystallizer is intensified and the fluctuation of the liquid level of the crystallizer is large under high drawing speed, thereby increasing the risk of steel leakage and influencing the smooth production on one hand; on the other hand, the control of the casting blank quality is not facilitated, and the casting blank is easy to generate defects such as slag inclusion, cracks and the like.
Disclosure of Invention
The invention aims to provide a method for controlling the molten steel flow of a sheet billet continuous casting crystallizer, which effectively connects electromagnetic braking control current with a casting section, a casting speed and the insertion depth of a submerged nozzle so as to realize synchronous dynamic automatic control of the whole system, effectively inhibit the fluctuation of the liquid level of the crystallizer at a meniscus, control the fluctuation of the liquid level of the crystallizer within +/-3 mm and ensure that the standard deviation of the liquid level fluctuation is less than 0.7 mm; the flow of the molten steel in the crystallizer forms an ideal double-roller flow field, reduces the phenomena of slag entrapment and steel leakage in the process of casting blank solidification, improves the quality of the casting blank, and effectively solves the problems in the prior art.
The technical scheme of the invention is as follows: a method for controlling the flow of molten steel in a continuous thin slab casting mold comprises the following steps:
(1) before molten steel casting, selecting a corresponding electromagnetic braking control mode according to a production plan;
(2) opening an electromagnetic braking device before casting, wherein the electromagnetic braking device is always in an opening state in the casting process, when the casting speed is monitored to be less than or equal to a set value, the current parameter is 0A, when the casting speed is greater than the set value, the reference current parameter of the electromagnetic braking device is controlled, and the control range is 0-900A;
(3) in the casting process, the coefficient correction is carried out on the reference current along with the change of the insertion depth of the submerged nozzle.
The set value of the pulling speed can be manually adjusted according to the actual situation, and is generally between 3.0 and 4.0 m/min.
In the step (2), the electromagnetic brake device is arranged outside the crystallizer, the electromagnetic brake comprises 5 pairs of coils, and the two pairs of coils are centrally and symmetrically distributed relative to the center of the crystallizer, so that molten steel stream is braked and liquid level fluctuation of the crystallizer is inhibited; the lower two pairs of coils are distributed in central symmetry relative to the center of the crystallizer, so that the impact depth of the stream is reduced; the middle coils are opposite to each other in the middle center of the crystallizer, so that the stable flow of the submersed nozzle is realized; the combination realizes a double-roller flow field of the crystallizer, and the current intensity of the five pairs of coils is synchronously changed by changing the electromagnetic braking current.
In the step (2), different current controls are determined according to the section, the pulling rate and the surface quality of the casting blank, and a current curve is calculated by using an interpolation method.
In the step (3), the immersion nozzle insertion depth is automatically controlled, the range is 0-70mm, and the range interval of the reference current correction coefficient is [0.9,1.1 ]; when the immersion type water gap insertion depth is 35mm, setting a reference current correction coefficient as 1; when the insertion depth of the submerged nozzle is 0-35mm, the correction coefficient of the reference current is [0.9,1 ]; when the depth of the immersion nozzle is 35-70mm, the correction coefficient of the reference current is 1, 1.1.
The electromagnetic braking control parameters are set in the second stage of continuous casting, and are automatically controlled synchronously and dynamically with the pulling speed and the immersion type water gap insertion depth, and generally the electromagnetic braking control parameters do not need human intervention in the production process.
The beneficial effects of the invention are: the electromagnetic braking control current is effectively connected with the casting section, the casting speed and the immersion type water gap insertion depth, so that the synchronous dynamic automatic control of the whole system is realized, the fluctuation of the liquid level of the crystallizer at a meniscus is effectively inhibited, the fluctuation of the liquid level of the crystallizer is controlled to be +/-3 mm, and the standard deviation of the liquid level fluctuation is less than 0.7 mm; the flow of the molten steel in the crystallizer forms an ideal double-roller flow field, thereby reducing the phenomena of slag entrapment and steel leakage in the process of casting blank solidification and improving the quality of the casting blank.
Drawings
FIG. 1 is a schematic view of an electromagnetic braking device of a continuous casting machine according to the present invention;
FIG. 2 is a graph of reference current as a function of pull rate in accordance with the present invention;
FIG. 3 is a graph showing the time-dependent change of the depth of insertion of a submerged entry nozzle according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A method for controlling the flow of molten steel in a continuous thin slab casting mold comprises the following steps:
(1) before molten steel casting, selecting a corresponding electromagnetic braking control mode according to a production plan;
(2) opening an electromagnetic braking device before casting, wherein the electromagnetic braking device is always in an opening state in the casting process, when the casting speed is monitored to be less than or equal to a set value, the current parameter is 0A, when the casting speed is greater than the set value, the reference current parameter of the electromagnetic braking device is controlled, and the control range is 0-900A;
(3) in the casting process, the coefficient of the reference current is corrected along with the change of the insertion depth of the submerged nozzle.
The set pulling speed value is 3.4 m/min.
In the step (2), the electromagnetic brake device is arranged outside the crystallizer, the electromagnetic brake comprises 5 pairs of coils, and the two pairs of coils are centrally and symmetrically distributed relative to the center of the crystallizer, so that molten steel stream is braked and liquid level fluctuation of the crystallizer is inhibited; the lower two pairs of coils are distributed in central symmetry about the center of the crystallizer to slow down the impact depth of the stream; the middle coils are opposite to each other in the middle center of the crystallizer, so that the stability of the immersion type water gap stream is realized; the combination realizes a double-roller flow field of the crystallizer, and the current intensity of the five pairs of coils is synchronously changed by changing the electromagnetic braking current.
In the step (2), different current controls are determined according to the section, the pulling rate and the surface quality of the casting blank, and a current curve is calculated by using an interpolation method.
In the step (3), the immersion nozzle insertion depth is automatically controlled, the range is 0-70mm, and the range interval of the reference current correction coefficient is [0.9,1.1 ]; when the immersion type water gap insertion depth is 35mm, setting a reference current correction coefficient as 1; when the insertion depth of the submerged nozzle is 0-35mm, the correction coefficient of the reference current is [0.9,1 ]; when the depth of the immersion nozzle is 35-70mm, the correction coefficient of the reference current is 1, 1.1.
The electromagnetic braking control parameters are set in the second stage of continuous casting, and are automatically controlled synchronously and dynamically with the pulling speed and the immersion type water gap insertion depth, and generally the electromagnetic braking control parameters do not need human intervention in the production process.
In practical application, the specific operation flow is as follows:
1. electromagnetic braking control parameters are set on the second stage of continuous casting, and the parameters are synchronously, dynamically and automatically controlled with the casting speed and the immersion type water gap insertion depth.
2. According to a production plan, for example, casting blanks with the thickness of 70mm and the width of 1400mm are produced, and an electromagnetic braking control mode corresponding to the casting blank with the thickness of 70mm is selected.
3. And opening an electromagnetic brake control switch 30 minutes before the molten steel is cast.
4. In the process of casting the molten steel, the electromagnetic brake optimally controls the flow of the molten steel of the crystallizer, so that the fluctuation of the liquid level of the crystallizer is reduced, and an ideal double-roller flow field is formed.
5. Specifically, in the casting process, when the pulling speed is 0-3.4m/min, the electromagnetic braking current is 0A. When the pulling speed is more than 3.4m/min, according to the insertion depth of the current submerged nozzle, the actual current of the electromagnetic brake is the reference current multiplied by a correction coefficient: for example, when the pulling speed is 3.7m/min and the immersion nozzle insertion depth is 50mm, the reference current is 25A, the correction coefficient is 1.03, and the actual control current of the electromagnetic brake is 25.75A. For example, when the pulling speed is 5.5m/min and the immersion nozzle insertion depth is 15mm, the reference current is 500A, the correction coefficient is 0.96, and the actual control current of the electromagnetic brake is 480A.
6. After the control method is put into the casting process, the fluctuation of the liquid level of the crystallizer is +/-2 mm, the standard deviation of the fluctuation of the liquid level is 0.4mm at most, no obvious defect is found in the product quality, and the production requirement is met.
Claims (5)
1. A method for controlling the flow of molten steel in a continuous thin slab casting crystallizer is characterized by comprising the following steps:
(1) before the molten steel is cast, selecting a corresponding electromagnetic braking control mode according to a production plan;
(2) opening an electromagnetic braking device before casting, wherein the electromagnetic braking device is always in an opening state in the casting process, when the casting speed is monitored to be less than or equal to a set value, the current parameter is 0A, when the casting speed is greater than the set value, the reference current parameter of the electromagnetic braking device is controlled, and the control range is 0-900A;
(3) in the casting process, the coefficient of the reference current is corrected along with the change of the insertion depth of the submerged nozzle.
2. The method for controlling the flow of molten steel in a continuous thin slab casting mold according to claim 1, wherein: the set value of the pulling speed is adjusted to be between 3.0 and 4.0m/min according to the actual situation.
3. The method for controlling the flow of molten steel in a continuous thinslab casting mold according to claim 1, wherein: in the step (2), the electromagnetic brake device is arranged outside the crystallizer, the electromagnetic brake comprises 5 pairs of coils, and the two pairs of coils are distributed in central symmetry with respect to the center of the crystallizer, so that the brake of molten steel streams and the inhibition of liquid level fluctuation of the crystallizer are realized; the lower two pairs of coils are distributed in central symmetry relative to the center of the crystallizer, so that the impact depth of the stream is reduced; the middle coils are opposite to each other in the middle center of the crystallizer, so that the stable flow of the submersed nozzle is realized; the combination realizes a double-roller flow field of the crystallizer, and the current intensity of the five pairs of coils is synchronously changed by changing the electromagnetic braking current.
4. The method for controlling the flow of molten steel in a continuous thin slab casting mold according to claim 1, wherein: in the step (2), different current controls are determined according to the section, the pulling rate and the surface quality of the casting blank, and a current curve is calculated by using an interpolation method.
5. The method for controlling the flow of molten steel in a continuous thin slab casting mold according to claim 1, wherein: the electromagnetic braking control parameters are set in the second stage of continuous casting, and are automatically controlled synchronously and dynamically with the pulling speed and the immersion type water gap insertion depth, and generally the electromagnetic braking control parameters do not need human intervention in the production process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210203092.8A CN114769539A (en) | 2022-03-03 | 2022-03-03 | Method for controlling molten steel flow of sheet billet continuous casting crystallizer |
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| CN202210203092.8A CN114769539A (en) | 2022-03-03 | 2022-03-03 | Method for controlling molten steel flow of sheet billet continuous casting crystallizer |
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| CN114769539A true CN114769539A (en) | 2022-07-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116493563A (en) * | 2023-06-28 | 2023-07-28 | 江苏永钢集团有限公司 | Crystallizer liquid level control system |
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2022
- 2022-03-03 CN CN202210203092.8A patent/CN114769539A/en active Pending
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Cited By (2)
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| CN116493563B (en) * | 2023-06-28 | 2023-09-12 | 江苏永钢集团有限公司 | Crystallizer liquid level control system |
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