CN114905022A - Secondary cooling water distribution method for controlling internal cracking of continuous casting slab - Google Patents
Secondary cooling water distribution method for controlling internal cracking of continuous casting slab Download PDFInfo
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- CN114905022A CN114905022A CN202210469638.4A CN202210469638A CN114905022A CN 114905022 A CN114905022 A CN 114905022A CN 202210469638 A CN202210469638 A CN 202210469638A CN 114905022 A CN114905022 A CN 114905022A
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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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
The invention belongs to the technical field of steelmaking and continuous casting, and relates to a secondary cooling water distribution method for controlling the internal crack of a continuous casting slab, which is a novel continuous casting secondary cooling water distribution method comprehensively considering the thickness, the surface area and the drawing speed process parameters of a solidified shell, integrates the cooling area of a casting slab, the thickness of the solidified shell and the drawing speed process parameters, can adapt to different drawing speed changes and different shell thicknesses, meets the cooling requirements, and is favorable for controlling the internal crack of the casting slab; meanwhile, numerical iterative computation is not needed, and the method has the characteristics of small operand and quick response.
Description
Technical Field
The invention belongs to the technical field of steelmaking and continuous casting, and relates to a secondary cooling water distribution method for controlling internal cracking of a continuous casting slab.
Background
The conventional secondary cooling water distribution of the slab continuous casting at present has a specific water quantity control method, a surface density control method and a temperature control method. The specific water quantity control method is used for representing the total cooling intensity of all the secondary cooling areas, and has the defects that the specific water quantity at different drawing speeds needs to be preset to distribute the water quantity to the secondary cooling areas, and whether the water quantity of each secondary cooling area is proper or not has no comparative reference. The surface density control method is the amount of cooling water per unit area of the surface of a cast slab, and has the defect that whether the amount of cooling water is appropriate or not at different pouring lengths is not compared with a standard. The surface temperature control method calculates the surface temperature of the casting blank through numerical simulation, and then controls the proper cooling water amount of each area, and has the defects of large calculation amount and easy generation of accidents of insufficient water amount or overlarge water amount under the condition of sudden or abnormal production. The higher the ferrostatic pressure of the continuous casting blank in the casting machine along with the increase of the height, the greater the stress of the casting blank at different positions in the casting machine and the deformation resistance of the casting blank directly influence the internal crack generation of the casting blank, and the thickness of the solidified shell of the casting blank has important influence on the deformation resistance of the casting blank. In terms of stably improving the internal quality of the casting blank, the secondary cooling control should consider the influence of the solidified shell of the casting blank. The three typical secondary cooling water distribution methods do not bring the thickness parameter of the solidified blank shell into secondary cooling water quantity calculation, and internal cracks of the casting blank caused by unreasonable water distribution system are easy to generate.
Disclosure of Invention
In view of the above, the present invention aims to provide a secondary cooling water distribution method for controlling the internal crack of a continuous casting slab, which comprehensively considers the thickness, the surface area and the drawing speed process parameters of a solidified shell, so as to solve the problem of the internal crack of the existing casting slab.
In order to achieve the purpose, the invention provides the following technical scheme: a secondary cooling water distribution method for controlling the internal crack of a continuous casting slab comprises the following steps:
s1, determining a secondary cooling zone structure of the continuous casting machine and width and length parameters of each cooling zone;
s2, determining the length from the liquid level of the crystallizer to each cooling area;
s3, determining a casting blank solidification coefficient K for calculating the thickness of a solidified shell of a casting blank in the frame of each cooling area;
s4, determining the maximum pulling speed of the casting machine;
s5, setting the last cooling area as the nth area, and the cooling water amount of each cooling area is as follows: q i ＝60000×β i ×S i ×H i ×V 2 ；
S6，The secondary cooling coefficient of the cooling zone is: beta is a i ＝0.0000385257+0.12086×exp(-(L i -1.04546)/0.72875)+ 0.01811×exp(-(L i -1.04546)/7.6382)；
S7, calculating the cooling water amount of each cooling zone at the pulling speed according to the known pulling speed V and the distance Li between the cooling zone and the liquid level of the crystallizer;
and S8, combining the cooling water quantities at different drawing speeds to manufacture the cooling water meter of the casting machine.
Optionally, in step S5, i is the ith cooling zone, i is 1, 2 … n; q i The amount of secondary cooling water in the ith cooling area is L/min; beta is a i Is the secondary cooling coefficient of the ith cooling zone and has the unit of h/m 2 ；S i Surface area of strand in cooling zone i, m 2 ；H i The ith cooling zone has an average solidified shell thickness in m.
Optionally, in step S6, L i The distance between the ith cooling zone and the liquid level of the crystallizer is m.
The invention has the beneficial effects that: the secondary cooling water distribution method for controlling the internal cracking of the continuous casting slab integrates the cooling area of the casting slab, the thickness of the solidified slab shell and the drawing speed process parameters, can adapt to different drawing speed changes and the requirements of different slab shell thicknesses on cooling, and is favorable for controlling the internal cracks of the casting slab; the method does not need numerical value iterative computation, and has the characteristics of small operand and quick response.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
In the concrete embodiment, according to the method,
a secondary cooling water distribution method for controlling the internal crack of a continuous casting slab comprises the following steps:
s1, determining a secondary cooling zone structure of the continuous casting machine and width and length parameters of each cooling zone;
s2, determining the length from the liquid level of the crystallizer to each cooling area;
s3, determining a casting blank solidification coefficient K for calculating the thickness of a solidified shell of a casting blank in the frame of each cooling area;
s4, determining and determining the maximum casting speed of the casting machine;
s5, setting the last cooling area as the nth area, and the cooling water amount of each cooling area is as follows: q i ＝60000×β i ×S i ×H i ×V 2 ；
Wherein i is the ith cooling zone, i is 1, 2 … n; q i The amount of secondary cooling water in the ith cooling area is L/min; beta is a i Is the secondary cooling coefficient of the ith cooling zone and has the unit of h/m 2 ；S i Surface area of strand in cooling zone i, m 2 ；H i The average solidified shell thickness of the ith cooling zone is m;
s6, the secondary cooling coefficient of the cooling area is as follows: beta is a i ＝0.0000385257+0.12086×exp(-(L i -1.04546)/0.72875)+ 0.01811×exp(-(L i -1.04546)/7.6382), wherein L i The distance between the ith cooling zone and the liquid level of the crystallizer is m;
s7, calculating the cooling water amount of each cooling zone at the pulling speed according to the known pulling speed V and the distance Li between the cooling zone and the liquid level of the crystallizer;
and S8, combining the cooling water quantities at different drawing speeds to manufacture the cooling water meter of the casting machine.
In this embodiment, the length L from each secondary cooling zone to the liquid level of the crystallizer can be checked according to the design manual of the continuous casting machine i (ii) a According to the soft reduction system or the design manual, the solidification of the casting blank at different positions can be calculatedThickness H i (ii) a According to the production specification of the casting machine, the surface area S of each secondary cooling area can be calculated i 。
In the specific embodiment 1, the method comprises the following steps of,
when the pulling speed V is 1.20m/min, the width of a production section is 1.53m, the length of an inner arc of a secondary cooling 5 area is 1.927m, the length from the secondary cooling 5 area to the liquid level of a crystallizer is 5.25m, the solidification thickness of a casting blank at the middle position of the secondary cooling 5 area is 0.0544m, and the parameters are substituted into the formula, so that the water quantity Q of the inner arc of the secondary cooling 5 area can be obtained 5 ＝150.49L/min。
In the specific embodiment 2, the method comprises the following steps of,
when the pulling speed V is 1.40m/min, the width of a production section is 1.53m, the length of an inner arc of a secondary cooling 5 area is 1.927m, the length from the secondary cooling 5 area to the liquid level of a crystallizer is 5.25m, the solidification thickness of a casting blank at the middle position of the secondary cooling 5 area is 0.0504m, and the parameters are substituted into the formula, so that the water quantity Q of the inner arc of the secondary cooling 5 area can be obtained 5 ＝189.76L/min。
In a specific embodiment of the method of example 3,
when the pulling speed V is 1.20m/min, the width of the production section is 1.53m, the length of the inner arc of the secondary cooling 6 area is 3.85m, the length from the secondary cooling 6 area to the liquid level of the crystallizer is 8.14m, the solidification thickness of the casting blank at the middle position of the secondary cooling 6 area is 0.0677m, and the parameters are substituted into the formula, so that the water quantity Q of the inner arc of the secondary cooling 6 area can be obtained 6 ＝248.06L/min。
In a specific embodiment of the method of example 4,
when the pulling speed V is 1.40m/min, the width of a production section is 1.53m, the length of an inner arc of a secondary cooling 6 area is 3.85m, the length from the secondary cooling 6 area to the liquid level of a crystallizer is 8.14m, the solidification thickness of a casting blank at the middle position of the secondary cooling 6 area is 0.0677m, and the parameters are substituted into the formula, so that the water quantity Q of the inner arc of the secondary cooling 6 area can be obtained 6 ＝312.70L/min。
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (3)
1. A secondary cooling water distribution method for controlling the internal crack of a continuous casting slab is characterized by comprising the following steps:
s1, determining a secondary cooling zone structure of the continuous casting machine and width and length parameters of each cooling zone;
s2, determining the length from the liquid level of the crystallizer to each cooling area;
s3, determining a casting blank solidification coefficient K for calculating the thickness of a solidified shell of a casting blank in the frame of each cooling area;
s4, determining the maximum pulling speed of the casting machine;
s5, setting the last cooling area as the nth area, and the cooling water amount of each cooling area is as follows: q i ＝60000×β i ×S i ×H i ×V 2 ；
S6, the secondary cooling coefficient of the cooling area is as follows: beta is a i ＝0.0000385257+0.12086×exp(-(L i -1.04546)/0.72875)+0.01811×exp(-(L i -1.04546)/7.6382)；
S7, calculating the cooling water amount of each cooling zone at the pulling speed according to the known pulling speed V and the distance Li between the cooling zone and the liquid level of the crystallizer;
and S8, combining the cooling water quantities at different drawing speeds to manufacture the cooling water meter of the casting machine.
2. The secondary cooling water distribution method for controlling the internal crack of the continuous casting slab as claimed in claim 1, wherein: in the step S5, i is the ith cooling zone, i is 1 and 2 … n; q i The amount of secondary cooling water in the ith cooling area is L/min; beta is a i Is the secondary cooling coefficient of the ith cooling zone and has the unit of h/m 2 ；S i Surface area of strand in cooling zone i, m 2 ；H i The ith cooling zone has an average solidified shell thickness in m.
3. The secondary cooling water distribution method for controlling the internal crack of the continuous casting slab as claimed in claim 1, wherein: in step S6, L i The distance between the ith cooling zone and the liquid level of the crystallizer is m.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07303951A (en) * | 1994-03-16 | 1995-11-21 | Nisshin Steel Co Ltd | Secondary cooling method for continuous casting and the device thereof |
| JPH11333551A (en) * | 1998-03-26 | 1999-12-07 | Sumitomo Metal Ind Ltd | Method and device for controlling molten metal surface level in continuous casting |
| JP2006198643A (en) * | 2005-01-19 | 2006-08-03 | Jfe Steel Kk | Method of manufacturing continuously cast slab |
| CN101678447A (en) * | 2007-06-28 | 2010-03-24 | 住友金属工业株式会社 | Method of continuously casting small-section billet |
| CN102110188A (en) * | 2009-12-25 | 2011-06-29 | 鞍钢股份有限公司 | Continuous casting flow temperature and solid fraction distribution calculation method |
| CN102371350A (en) * | 2010-08-25 | 2012-03-14 | 攀钢集团钢铁钒钛股份有限公司 | Continuous casting method of electrical steel |
| JP2019022911A (en) * | 2018-09-03 | 2019-02-14 | 株式会社神戸製鋼所 | Method for steel continuous casting |
| CN112528432A (en) * | 2020-12-04 | 2021-03-19 | 东北大学 | Continuous casting billet solidification heat transfer calculation method considering non-uniform secondary cooling |
-
2022
- 2022-04-28 CN CN202210469638.4A patent/CN114905022B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07303951A (en) * | 1994-03-16 | 1995-11-21 | Nisshin Steel Co Ltd | Secondary cooling method for continuous casting and the device thereof |
| JPH11333551A (en) * | 1998-03-26 | 1999-12-07 | Sumitomo Metal Ind Ltd | Method and device for controlling molten metal surface level in continuous casting |
| JP2006198643A (en) * | 2005-01-19 | 2006-08-03 | Jfe Steel Kk | Method of manufacturing continuously cast slab |
| CN101678447A (en) * | 2007-06-28 | 2010-03-24 | 住友金属工业株式会社 | Method of continuously casting small-section billet |
| CN102110188A (en) * | 2009-12-25 | 2011-06-29 | 鞍钢股份有限公司 | Continuous casting flow temperature and solid fraction distribution calculation method |
| CN102371350A (en) * | 2010-08-25 | 2012-03-14 | 攀钢集团钢铁钒钛股份有限公司 | Continuous casting method of electrical steel |
| JP2019022911A (en) * | 2018-09-03 | 2019-02-14 | 株式会社神戸製鋼所 | Method for steel continuous casting |
| CN112528432A (en) * | 2020-12-04 | 2021-03-19 | 东北大学 | Continuous casting billet solidification heat transfer calculation method considering non-uniform secondary cooling |
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