CN111922311B - Tundish liquid level control method in continuous casting production process - Google Patents
Tundish liquid level control method in continuous casting production process Download PDFInfo
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- CN111922311B CN111922311B CN202010722356.1A CN202010722356A CN111922311B CN 111922311 B CN111922311 B CN 111922311B CN 202010722356 A CN202010722356 A CN 202010722356A CN 111922311 B CN111922311 B CN 111922311B
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- ladle
- liquid level
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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
Abstract
The invention relates to the field of ferrous metallurgy, and discloses a tundish liquid level control method in a continuous casting production process. The technical scheme provided by the invention can ensure the stable liquid level of the tundish during ladle changing, avoid the pulling speed adjustment performed by ensuring the liquid level and provide equipment technical guarantee for the stable quality of the casting blank.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, in particular to a tundish liquid level control method in a continuous casting production process.
Background
With the rapid development of society, the steel material is used as the most popular metal material, and the quality and performance requirements are higher and higher, which puts higher requirements on the blank quality of steel products, including the uniformity, purity and compactness of chemical components of the blank, and the quality stability is more important and the technical control difficulty is higher. In the large production process, the stability of the quality of the casting blank can provide a basic supporting function for the optimization control of the later rolling process and the product quality. In the modern ferrous metallurgy industry, due to the advantages of high efficiency, greenness, low cost and the like of continuous casting, the production of a plurality of steel products is gradually changed from die casting to continuous casting, and the section size of the continuous casting is continuously increased. Continuous casting is a core process link of ferrous metallurgy, and high-quality molten steel obtained by steel-making refining can obtain an optimal blank only by obtaining casting solidification of an optimal process.
In the actual production process, because the process system of the continuous casting process is huge, the fluctuation of each process detail can bring different degrees of influence on the control of the final quality of the casting blank. For example, the liquid level of the tundish in the ladle changing process fluctuates, so that the liquid level of molten tundish steel is reduced, and the slag entrapment risk is greatly increased due to the reduction of the liquid level of the tundish. In addition, after the ladle change is finished, the flow velocity of molten steel from the ladle to the tundish needs to be increased in order to recover the normal liquid level, so that the flow field nearby the casting flow fluctuates, the flow field is not beneficial to stable control, and a plurality of manufacturers adopt speed reduction to ensure that the liquid level of the tundish is relatively stable in the ladle change process, but the speed reduction can cause the quality of all casting blanks in the flow channel to be influenced.
Therefore, it is desirable to provide a new technical solution to solve the above problems.
Disclosure of Invention
The invention aims to solve the problem of unstable tundish liquid level in the continuous casting production process in the prior art, and provides a tundish liquid level control method in the continuous casting production process, which can ensure stable tundish liquid level during the ladle changing process, avoid the pulling speed adjustment for ensuring the liquid level and provide equipment technical guarantee for stable casting blank quality.
In order to achieve the above object, the present invention provides a method for controlling a tundish liquid level in a continuous casting production process, wherein a buffer ladle is arranged between a ladle and a tundish to maintain a stable tundish liquid level in a ladle changing process, and the size of the buffer ladle satisfies the following formula:
S*N*V*7.2*T/60＝s*h*7.2 (1)
the method comprises the following steps of firstly, pouring a cache ladle on a casting machine, wherein S is the section size of the continuous casting machine, N is the casting flow number of the continuous casting machine, V is the casting pulling speed of the continuous casting machine, T is the casting ladle changing time, S is the horizontal section size of the cache ladle, and h is the liquid level height of the cache ladle.
Preferably, the number of casting flows of the continuous casting machine is 2-8.
Preferably, the casting pulling speed of the continuous casting machine is 0.45-0.72 m/min.
Preferably, the casting pulling speed of the continuous casting machine is 0.50-0.52 m/min.
Preferably, the casting ladle changing time is 50-65 s.
Preferably, the casting ladle changing time is 55-60 s.
Preferably, the buffer ladle comprises an upper long nozzle and a lower long nozzle, the upper long nozzle is communicated with the ladle, and the lower long nozzle is communicated with the middle ladle.
Preferably, the inner diameter of the upper long nozzle is 88-92 mm.
Preferably, the inner diameter of the lower long nozzle is 44-46 mm.
Preferably, the buffer bag is capped and filled with a shielding gas.
According to the technical scheme, the invention provides a tundish liquid level control method in a continuous casting production process, a buffer ladle is arranged between a ladle and a tundish in the continuous casting production process so as to maintain the stability of the tundish liquid level in the ladle changing process, and the size of the buffer ladle is determined according to the section size of a continuous casting machine, the casting flow number of the continuous casting machine, the casting pulling speed of the continuous casting machine and the casting ladle changing time length. The technical scheme provided by the invention can ensure the stable liquid level of the tundish during ladle changing, avoid the pulling speed adjustment performed by ensuring the liquid level and provide equipment technical guarantee for the stable quality of the casting blank.
Drawings
FIG. 1 is a front view of a cache pack assembled with a ladle and a tundish according to the present invention;
fig. 2 is a top view of the assembled cache packet, ladle and tundish of the present invention.
Description of the reference numerals
10-feeding a long water gap; 20-discharging the long nozzle; 100-cache package; 200-a steel ladle; 300-middle package.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The continuous casting production process flow comprises the following steps: the method comprises the steps of conveying a ladle filled with refined molten steel to a rotary table, rotating the rotary table to a pouring position, injecting the molten steel into a middle ladle, distributing the molten steel into a crystallizer (sequentially comprising a crystallizer section and a secondary cooling section) through a water gap by the middle ladle, forming a casting by the crystallizer, rapidly solidifying and crystallizing, electromagnetically stirring the casting in the crystallizer, then carrying out induction electromagnetic heating, finally pulling out the casting in the crystallizer by a withdrawal and straightening machine, cooling and cutting into a casting blank with a certain specification.
The invention provides a tundish liquid level control method in a continuous casting production process, as shown in figure 1-2, the method is characterized in that a buffer ladle 100 is arranged between a ladle 200 and a tundish 300 to maintain stable tundish liquid level in a ladle changing process, and the size of the buffer ladle 100 meets the formula:
S*N*V*7.2*T/60＝s*h*7.2 (1)
wherein S is the section size of the continuous casting machine and the unit is mm2(ii) a N is the casting flow number of the continuous casting machine; v is the casting drawing speed of a continuous casting machine, and the unit is m/min; t is the casting ladle changing time length, and the unit is s; s is the horizontal section size of the buffer package in mm2(ii) a h is the height of the buffer bag liquid level and the unit is mm.
The size of the buffer ladle 100 is determined according to the section size of a continuous casting machine, the casting flow number of the continuous casting machine, the casting pulling speed of the continuous casting machine and the casting ladle changing time. The technical scheme provided by the invention can ensure the stable liquid level of the tundish during ladle changing, avoid the pulling speed adjustment performed by ensuring the liquid level and provide equipment technical guarantee for the stable quality of the casting blank.
Specifically, in the technical scheme provided by the invention, the number of casting flows (the number of casting blanks which can be simultaneously cast by one continuous casting machine) of the continuous casting machine is 2-8. Namely, the value of the casting flow number of the continuous casting machine is one of 2, 3, 4, 5, 6, 7 or 8, and the value of the casting flow number of the continuous casting machine is preferably 4 in the embodiment, so that the stability of the quality of a cast blank formed by casting can be better ensured under the value.
The casting speed of the continuous casting machine is 0.45-0.72m/min, preferably 0.50-0.52 m/min. In the embodiment, the casting pulling speed of the continuous casting machine is a constant value, and during ladle changing, the buffer ladle is added to control the stable liquid level of the molten steel in the ladle, so that the casting pulling speed of the continuous casting machine is prevented from being adjusted, and the stability of the casting quality under the constant speed condition is ensured.
The casting ladle changing time is 50-65s, and preferably 55-60 s. During the ladle changing time, the buffer ladle is helpful for adjusting the flow of the molten steel flowing into the tundish from the ladle, so that the liquid level of the molten steel in the tundish is maintained stable.
In this embodiment, the buffer ladle 100 includes an upper long nozzle 10 and a lower long nozzle 20, the upper long nozzle 10 is communicated with the ladle 200, and the lower long nozzle 20 is communicated with the middle ladle 300. Molten steel flows into the buffer ladle 100 from the steel ladle 200, and the liquid level of the molten steel in the buffer ladle 100 is controlled to maintain stable liquid level of the medium ladle, so that the pulling speed adjustment for ensuring the liquid level is avoided, and the good quality stability of a casting blank at a constant pulling speed is ensured.
Specifically, the inner diameter of the upper long nozzle 10 is 88-92mm, and the inner diameter of the lower long nozzle 20 is 44-46 mm. The long nozzle (also called as a protection tube) is used between the steel ladle and the middle ladle to play a role in sealing and protect the molten steel from secondary oxidation. By controlling the inner diameters of the upper long nozzle 10 and the lower long nozzle 20, the flow rate of the molten steel in the buffer ladle 100 flowing into the tundish 300 is controlled, and the stability of the molten steel in the tundish is guaranteed.
The buffer bag 100 is covered and filled with a shielding gas, which is an inert gas, preferably argon. Through adding the lid and filling argon at buffer memory package 100 to play sealed effect, avoid splashing metal adhesion at the mouth of a river wall, cause mouth of a river wall jam and melting loss.
The technical scheme provided by the invention can ensure the stable liquid level of the tundish during ladle changing, avoid the pulling speed adjustment performed by ensuring the liquid level and provide equipment technical guarantee for the stable quality of the casting blank.
The present invention will be described in detail below by way of examples, but the scope of the present invention is not limited thereto.
Example 1
In this example, a steel mill produced No. 45 steel with a cross section of 360mm × 450mm by the method of the present invention.
The specific design parameters are as follows:
the section size S of the continuous casting machine is 360mm multiplied by 450 mm;
the casting flow number N of the continuous casting machine is 4 flows;
the casting speed V of the continuous casting machine is 0.52 m/min;
the casting ladle changing time T is 55 s;
the horizontal section dimension s of the buffer packet is 800mm multiplied by 800 mm.
The calculation of the buffer packet liquid level is carried out by the molten steel balance equation S.N.V.7.2. T/60. s.h.7.2, namely, (360/1000) 450/1000. 4. 0.52. 7.2. 55/60. 800/1000. 800/1000. h/1000. 7.2.
The calculation of the formula shows that the liquid level h of the buffer packet is 483mm, namely the liquid level of the buffer packet is ensured to reach 480-490mm at the moment before the packet is replaced.
Besides the above key technical points, the present invention needs to be implemented according to requirements, and other continuous casting system processes are required to be implemented according to conventional implementation.
By implementing the embodiment, the constant-speed casting at the target pulling speed of 0.52m/min in the ladle changing process is realized, and the weighing fluctuation of molten ladle steel is less than 0.24t in the continuous casting process.
By performing center segregation test of the center line on the test casting blank of the embodiment by taking the center longitudinal sample parallel to the thickness direction, the following conclusion can be obtained: under the size condition of phi 5mm, the macrosegregation degree of the C element is controlled to be 1.08-1.12, which is obviously superior to 0.98-1.19 produced by the conventional technology. The quality stability of the casting blank is improved.
Example 2
In this example, a steel mill produced No. 45 steel with a cross section of 360mm × 450mm by the method of the present invention.
The specific design parameters are as follows:
the section size S of the continuous casting machine is 360mm multiplied by 450 mm;
the casting flow number N of the continuous casting machine is 4 flows;
the casting speed V of the continuous casting machine is 0.50 m/min;
the casting ladle changing time T is 60 s;
the horizontal section dimension s of the buffer packet is 800mm multiplied by 800 mm.
The calculation of the buffer inclusion liquid level is carried out by the molten steel balance equation S.N.V.7.2. T/60. s.h.7.2, namely, (360/1000). 450/1000. 4. 0.50. 7.2. 60/60. 800/1000. 800/1000. h/1000. 7.2.
The calculation of the formula shows that the liquid level h of the cache packet is 506mm, that is, the liquid level of the cache packet is ensured to reach 500-510mm at the moment before the packet is replaced.
Besides the above key technical points, the present invention needs to be implemented according to requirements, and other continuous casting system processes are required to be implemented according to conventional implementation.
By implementing the embodiment, the constant-speed casting at the target drawing speed of 0.50m/min in the ladle changing process is realized, and the weighing fluctuation of molten ladle steel is less than 0.21t in the continuous casting process.
By performing center segregation test of the center line on the test casting blank of the embodiment by taking the center longitudinal sample parallel to the thickness direction, the following conclusion can be obtained: under the size condition of phi 5mm, the macrosegregation degree of the C element is controlled to be 1.04-1.12, which is obviously superior to 0.99-1.18 produced by the conventional technology. The quality stability of the casting blank is improved.
Example 3
In this example, a steel mill produced No. 45 steel with a cross section of 360mm × 450mm by the method of the present invention.
The specific design parameters are as follows:
the section size S of the continuous casting machine is 360mm multiplied by 450 mm;
the casting flow number N of the continuous casting machine is 4 flows;
the casting speed V of the continuous casting machine is 0.52 m/min;
the casting ladle changing time T is 60 s;
the horizontal section dimension s of the buffer packet is 800mm multiplied by 800 mm.
The calculation of the buffer packet liquid level is carried out by the molten steel balance equation S.N.V.7.2. T/60. s.h.7.2, namely, (360/1000) 450/1000. 4. 0.52. 7.2. 60/60. 800/1000. 800/1000. h/1000. 7.2.
The calculation of the formula shows that the liquid level h of the buffer packet is 527mm, that is, the liquid level of the buffer packet is ensured to reach 520-530mm at the moment before the packet is replaced.
Besides the above key technical points, the present invention needs to be implemented according to requirements, and other continuous casting system processes are required to be implemented according to conventional implementation.
By implementing the embodiment, the constant-speed casting at the target pulling speed of 0.52m/min in the ladle changing process is realized, and the weighing fluctuation of molten ladle steel is less than 0.20t in the continuous casting process.
By performing center segregation test of the center line on the test casting blank of the embodiment by taking the center longitudinal sample parallel to the thickness direction, the following conclusion can be obtained: under the size condition of phi 5mm, the macrosegregation degree of the C element is controlled to be 1.08-1.12, which is obviously superior to 0.98-1.19 produced by the conventional technology. The quality stability of the casting blank is improved.
The above embodiment illustrates that after the technology is adopted, No. 45 steel with a cross section of 360mm × 450mm is produced, continuous casting can be realized in the ladle changing process, the target pulling speed constant-speed casting is kept, the liquid level of the tundish is stable, and the stable control of the casting blank quality is realized.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (7)
1. A tundish liquid level control method in a continuous casting production process is characterized in that a buffer ladle is arranged between a ladle and a tundish to maintain stable tundish liquid level in a ladle changing process, and the size of the buffer ladle meets the formula:
S*N*V*7.2*T/60＝s*h*7.2 (1)
the method comprises the following steps of A, casting, drawing, casting, ladle changing, cache ladle horizontal section size and cache ladle liquid level height, wherein S is the section size of a continuous casting machine, N is the casting flow number of the continuous casting machine, V is the casting drawing speed of the continuous casting machine, T is the casting ladle changing time, S is the horizontal section size of the cache ladle, and h is the cache ladle liquid level height;
the number of casting flows of the continuous casting machine is 4-8;
the casting speed of the continuous casting machine is 0.45-0.72 m/min;
the casting ladle changing time is 50-65 s.
2. The tundish liquid level control method in the continuous casting production process according to claim 1, wherein the casting speed of the continuous casting machine is 0.50-0.52 m/min.
3. The tundish liquid level control method in the continuous casting production process according to claim 1, wherein the casting ladle change time is 55-60 s.
4. The tundish liquid level control method in the continuous casting production process according to claim 1, wherein the buffer ladle comprises an upper long nozzle and a lower long nozzle, the upper long nozzle is communicated with the ladle, and the lower long nozzle is communicated with the tundish.
5. The tundish liquid level control method in the continuous casting production process according to claim 4, wherein the inner diameter of the upper long nozzle is 88-92 mm.
6. The tundish liquid level control method in the continuous casting production process according to claim 4, wherein the inner diameter of the lower long nozzle is 44-46 mm.
7. The tundish liquid level control method of the continuous casting production process according to any one of claims 1 to 6, wherein the buffer ladle is capped and filled with a shielding gas.
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Citations (7)
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| US3605862A (en) * | 1969-05-08 | 1971-09-20 | United States Steel Corp | System for feedback control of mold level in a continuous casting process utilizing a pour box |
| GB2163983A (en) * | 1984-09-05 | 1986-03-12 | Metacon Ag | Method of casting melt into a plurality of continuous casting moulds |
| JPH08238542A (en) * | 1995-03-02 | 1996-09-17 | Nippon Steel Corp | Supply control method for molten metal and alloy |
| JPH08294752A (en) * | 1995-03-02 | 1996-11-12 | Nippon Steel Corp | Method and device for controlling small amount feeding of molten metal and alloy |
| JPH09262644A (en) * | 1996-03-28 | 1997-10-07 | Nippon Steel Corp | Method for controlling supply of a little quantity of molten metal and alloy and apparatus therefor |
| KR20180106003A (en) * | 2017-03-17 | 2018-10-01 | 한국과학기술연구원 | Strip caster, method of fabricating metallic strip and evaluating hydrogen embrittlement according to chemical composition |
| CN109158567A (en) * | 2018-09-30 | 2019-01-08 | 武汉钢铁有限公司 | Continuous casting production even pours process constant liquis position control method |
-
2020
- 2020-07-24 CN CN202010722356.1A patent/CN111922311B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3605862A (en) * | 1969-05-08 | 1971-09-20 | United States Steel Corp | System for feedback control of mold level in a continuous casting process utilizing a pour box |
| GB2163983A (en) * | 1984-09-05 | 1986-03-12 | Metacon Ag | Method of casting melt into a plurality of continuous casting moulds |
| JPH08238542A (en) * | 1995-03-02 | 1996-09-17 | Nippon Steel Corp | Supply control method for molten metal and alloy |
| JPH08294752A (en) * | 1995-03-02 | 1996-11-12 | Nippon Steel Corp | Method and device for controlling small amount feeding of molten metal and alloy |
| JPH09262644A (en) * | 1996-03-28 | 1997-10-07 | Nippon Steel Corp | Method for controlling supply of a little quantity of molten metal and alloy and apparatus therefor |
| KR20180106003A (en) * | 2017-03-17 | 2018-10-01 | 한국과학기술연구원 | Strip caster, method of fabricating metallic strip and evaluating hydrogen embrittlement according to chemical composition |
| CN109158567A (en) * | 2018-09-30 | 2019-01-08 | 武汉钢铁有限公司 | Continuous casting production even pours process constant liquis position control method |
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