CN108393445B - Peritectic steel slab continuous casting crystallizer copper plate and water cooling method - Google Patents
Peritectic steel slab continuous casting crystallizer copper plate and water cooling method Download PDFInfo
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- CN108393445B CN108393445B CN201710064855.4A CN201710064855A CN108393445B CN 108393445 B CN108393445 B CN 108393445B CN 201710064855 A CN201710064855 A CN 201710064855A CN 108393445 B CN108393445 B CN 108393445B
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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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/059—Mould materials or platings
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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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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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
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Abstract
The invention provides a peritectic steel slab continuous casting crystallizer copper plate and a water cooling method, wherein the water cooling side of the crystallizer copper plate is divided into an upper area and a lower area, and a water tank, a water inlet pipe and a water outlet pipe are respectively arranged to form an upper water cooling system and a lower water cooling system which are independent; the upper portion advances water piping connection water tank, is equipped with temperature sensor and the electric heater unit who links to each other with the power control cabinet in the water tank, and temperature sensor links to each other with the PLC controller, and the regional basin hypomere degree of depth of lower part is greater than the regional basin degree of depth of upper portion. When the temperature sensor monitors that the temperature of water in the water tank is lower than a set value, the PLC controls the electric heating device to heat cooling water in the water tank; when the water temperature reaches a set value, the electric heating device automatically stops, so that the water temperature in the water tank is at a constant value. The water temperature of the lower area is controlled by the original water cooling system. The invention can reduce the shrinkage of the primary shell in the meniscus area, is beneficial to the uniform growth of the thickness of the shell, reduces the surface crack defect and improves the quality of peritectic steel continuous casting slabs.
Description
Technical Field
The invention belongs to the technical field of continuous casting, and particularly relates to a peritectic steel slab continuous casting crystallizer copper plate and a water cooling method thereof.
background
In the continuous casting production of peritectic steel, because peritectic reaction can occur to the blank shell near the meniscus of the crystallizer, the blank shell shrinks greatly, so that the heat flow of the meniscus area of the crystallizer is not uniform, and the thickness of the primary blank shell is not uniform. Stress concentration can occur at the thickness junction, and the primary blank is thin in shell and low in high-temperature strength, so that cracks on the surface of the casting blank are easily formed. Research shows that the heat flux density of the meniscus area of the crystallizer is reduced, the shrinkage of the primary blank shell of the meniscus can be inhibited, the uniformity of the heat flux of the meniscus area is facilitated, the uniformity of the thickness of the primary blank shell is promoted, and cracks caused by thermal stress concentration are prevented. The adoption of the crystallizer weak cooling technology is an effective method for reducing the heat flux density of the meniscus area of the crystallizer. The hot top crystallizer developed for realizing weak cooling of the crystallizer has obvious effect of improving the heat transfer of the crystallizer.
there are generally three methods for the hot top technology of crystallizers. The first method is to score the longitudinal groove on the inner surface of the crystallizer, and realize the slow cooling of the crystallizer by the air gap thermal resistance effect at the groove. The method has the advantages that by increasing the number of the grooves, the heat transfer between the primary casting blank shell of the casting blank and the inner wall of the crystallizer tends to be uniform, the thickness of the primary casting blank shell of the casting blank is uniform, the thermal stress of the blank shell is reduced, and the surface cracks of the casting blank can be reduced. The method has the defects of short service life of the crystallizer and easy occurrence of steel hanging accidents. The second method is to spray alloy with low heat conductivity coefficient on the inner wall of the crystallizer meniscus area water tank to increase the heat resistance, so that the heat flux density of the meniscus area is reduced and the primary blank shell grows uniformly. The advantages are that the coating is uniform, but the gap size is less than 1mm, the operation is difficult, and the coating is easy to fall off. The third method is to inlay low heat conduction material in the meniscus area of the crystallizer to reduce the heat flow density, so that the blank shell can be generated uniformly, but the linear expansion coefficient difference between the inlaid material and the copper plate is large, the temperature gradient of the copper plate is increased, the plating layer is easy to peel off, and the service life of the crystallizer is reduced. In addition, in the book "continuous casting slab quality control" of zeitake, two crystallizer weak cooling methods of reducing the cooling water flow rate of a crystallizer and increasing the water inlet temperature are introduced. By reducing the cooling water flow of the crystallizer, certain effect is achieved in practical application. However, reducing the flow rate of cooling water in the crystallizer means reducing the flow rate of cooling water, which easily causes boiling of cooling water and reduces the service life of the crystallizer. In addition, the method applies weak cooling technology to the whole crystallizer, so that the blank shell of the crystallizer is thinned, steel leakage is easy to occur, and the pulling speed is inhibited from being improved.
Disclosure of Invention
The invention aims to provide a peritectic steel slab continuous casting crystallizer copper plate and a water cooling method, which can realize weak cooling of a crystallizer in a meniscus area under the condition of not reducing the thickness of a crystallizer shell and are used for improving the quality of peritectic steel slab continuous casting billets.
therefore, the technical solution adopted by the invention is as follows:
A peritectic steel slab continuous casting crystallizer copper plate is characterized in that a water cooling side of the crystallizer copper plate is divided into an upper area and a lower area by taking a meniscus area downwards 45-55 mm as a boundary, the upper area and the lower area are respectively provided with a water tank, the upper area is provided with an upper water inlet pipe and an upper water outlet pipe, the upper water inlet pipe is connected with a water tank with a water inlet pipe, a temperature sensor and an electric heating device connected with a power supply control cabinet are arranged in the water tank, and the temperature sensor is connected with a PLC (programmable logic controller); the lower area is provided with a lower water inlet pipe and a lower water outlet pipe which are respectively connected with a water inlet pipeline and a water outlet pipeline of the original water cooling system, so that the crystallizer copper plate forms an upper independent water cooling system and a lower independent water cooling system; the regional basin of upper portion is the flat groove of depthkeeping, and the regional basin of lower part adopts two segmentation designs, and its upper segment sets up to be by shallow to dark longitudinal section for curved slot, and the hypomere is the flat groove of depthkeeping, and the regional basin hypomere degree of depth of lower part is greater than the regional basin degree of depth of upper portion.
The depth of the upper area water tank is 10-15 mm, and the depth of the lower section of the lower area water tank is 20-35 mm.
A water cooling method for peritectic steel slab continuous casting crystallizer copper plate comprises the following concrete water cooling control method:
Controlling the water temperature of a water cooling system in the upper area of the crystallizer copper plate:
Setting water temperature control parameters in a water tank and the water outlet temperature of an upper area on a PLC (programmable logic controller), setting the water temperature in the water tank to be 24-45 ℃, and when a temperature sensor monitors the water temperature in the water tank, namely the water temperature of an upper water inlet pipe of a crystallizer copper plate is lower than a set value by 24-45 ℃, sending a control instruction to a power supply control cabinet by the PLC, and heating cooling water in the water tank by the power supply control cabinet through an electric heating device; when the water temperature reaches a set value, the electric heating device automatically stops heating, so that the water temperature in the water tank is at a constant value; when the water temperature of the upper area reaches the set water outlet temperature of 28-48 ℃, the PLC automatically opens the upper water outlet pipe to discharge water;
controlling the water temperature of a water cooling system in the lower area of a crystallizer copper plate:
The water temperature of the lower area is controlled by the original water cooling system, in order to prevent the blank shell of the crystallizer from being thinned due to the weak cooling of the upper part of the crystallizer, the water temperature of cooling water in the lower area of a copper plate of the crystallizer is adjusted to 20-28 ℃ from the original 24-28 ℃, the water outlet temperature is controlled to 24-35 ℃, the cooling strength of the blank shell in the lower area of the crystallizer is strengthened by adjusting the temperature parameters of inlet and outlet water, and the thickness of the blank shell out of the crystallizer is improved.
The invention has the beneficial effects that:
Aiming at the defects of the existing technology for carrying out weak cooling on the crystallizer in the peritectic steel continuous casting process, the invention realizes the weak cooling technology of the meniscus area of the crystallizer by controlling the water cooling parameters of the upper and lower independent areas, can reduce the shrinkage of the primary shell of the meniscus area under the condition of not influencing the thickness of the cast blank out of the shell of the crystallizer, is beneficial to the uniform growth of the shell thickness, and reduces the surface crack defect caused by the concentration of thermal stress, thereby greatly improving the quality of peritectic steel continuous casting slabs.
drawings
FIG. 1 is a schematic view of the installation state of a copper plate of a peritectic steel slab continuous casting crystallizer;
3 fig. 32 3 is 3 a 3 sectional 3 view 3 a 3- 3 a 3 of 3 fig. 3 1 3. 3
in the figure: the device comprises a power control cabinet 1, a PLC (programmable logic controller) 2, a temperature sensor 3, a water tank 4, an upper region water tank 5, an upper region 6, an upper water outlet pipe 7, a lower water outlet pipe 8, a lower region 9, a lower water inlet pipe 10, an upper water inlet pipe 11, an electric heating device 12, a water tank water inlet pipe 13 and a lower region water tank 14.
Detailed Description
As can be seen from the attached drawings, the peritectic steel slab continuous casting crystallizer copper plate divides the water cooling side of the crystallizer copper plate into an upper area 6 and a lower area 9 by taking a meniscus area downwards 45-55 mm as a boundary, wherein the upper area 6 is provided with an upper area water tank 5, and the lower area 9 is provided with a lower area water tank 14. The upper region 6 is provided with an upper water inlet pipe 11 and an upper water outlet pipe 7, the upper water inlet pipe 11 is connected with a water tank 4 with a water tank water inlet pipe 13, a temperature sensor 3 and an electric heating device 12 are arranged in the water tank 4, the electric heating device 12 is connected with the power control cabinet 1, and the temperature sensor 3 is connected with the PLC 2. The lower area 9 is provided with a lower water inlet pipe 10 and a lower water outlet pipe 8, and the lower water inlet pipe 10 and the lower water outlet pipe 8 are respectively connected with a water inlet pipeline and a water outlet pipeline of the original water cooling system, so that the crystallizer copper plate forms an upper water cooling system and a lower water cooling system which are independent.
In order to reduce the heat flux density in the top area of the copper plate of the crystallizer and improve the weak cooling effect, the depth of the lower section of the water tank 14 in the lower area is larger than that of the water tank 5 in the upper area. The upper region water tank 5 adopts an equal-depth flat-bottom groove, the lower region water tank 14 adopts a two-section design, the upper section of the two-section design is a groove with an arc-shaped longitudinal section from shallow to deep, the lower section of the two-section design is an equal-depth flat-bottom groove, and the specific shape is shown in figure 2.
example 1:
Casting the common carbon peritectic steel with the carbon content of 0.10-0.18%.
Dividing the water-cooling side of the crystallizer copper plate into an upper area and a lower area by taking the meniscus area lower than 48mm as a boundary, wherein the depth of the upper area water tank 5 is 15mm, the depth of the lower area water tank 14 is 30mm, the water inlet temperature of the upper area 6 of the crystallizer copper plate is set to be 32 ℃, and the water outlet temperature is controlled to be 37 ℃. The temperature of the water entering the lower zone 9 is adjusted to 23 ℃ and the temperature of the water leaving the lower zone is controlled to 27 ℃ so as not to reduce the thickness of the shell of the ingot leaving the crystallizer.
example 2
casting low-alloy peritectic steel containing Nb and the like and having the carbon content of 0.10-0.18% and being sensitive to cracks.
The water cooling side of the crystallizer copper plate is divided into an upper area and a lower area by taking the meniscus area lower 52mm as a boundary, the depth of the upper area water tank 5 is set to be 10mm, the depth of the lower area water tank 14 is set to be 25mm, the water cooling parameter of the upper area 6 of the crystallizer copper plate is set to be 40 ℃, and the water outlet temperature is controlled to be 45 ℃. As the steel grade belongs to crack sensitive steel grade, the water cooling parameter of the lower area 9 of the crystallizer is adjusted to be water inlet temperature of 28 ℃, and the water outlet temperature is controlled to be a water cooling mode with relatively low cooling intensity of 32 ℃.
Claims (1)
1. A water cooling method for peritectic steel slab continuous casting crystallizer copper plate is characterized in that a water cooling side of the crystallizer copper plate is divided into an upper area and a lower area by taking a meniscus area downwards 45-55 mm as a boundary, the upper area and the lower area are provided with independent water cooling systems, and each independent water cooling system is respectively provided with an electric heating device and a temperature sensor and is connected with a PLC (programmable logic controller); the water tank in the upper area is an equal-depth flat-bottom tank, the water tank in the lower area adopts a two-section design, the upper section of the water tank is provided with a groove with an arc-shaped longitudinal section from shallow to deep, and the lower section of the water tank is an equal-depth flat-bottom tank; the concrete water cooling control method of the peritectic steel slab continuous casting crystallizer copper plate comprises the following steps:
Controlling the water temperature of a water cooling system in the upper area of the crystallizer copper plate:
Setting water temperature control parameters in a water tank and the water outlet temperature of an upper area on a PLC (programmable logic controller), setting the water temperature in the water tank to be 24-45 ℃, and when a temperature sensor monitors the water temperature in the water tank, namely the water temperature of an upper water inlet pipe of a crystallizer copper plate is lower than a set value by 24-45 ℃, sending a control instruction to a power supply control cabinet by the PLC, and heating cooling water in the water tank by the power supply control cabinet through an electric heating device; when the water temperature reaches a set value, the electric heating device automatically stops heating, so that the water temperature in the water tank is at a constant value; when the water temperature of the upper area reaches the set water outlet temperature of 28-48 ℃, the PLC automatically opens the upper water outlet pipe to discharge water;
controlling the water temperature of a water cooling system in the lower area of a crystallizer copper plate:
The water temperature of the lower area is controlled by the original water cooling system, in order to prevent the blank shell of the crystallizer from being thinned due to the weak cooling of the upper part of the crystallizer, the water temperature of cooling water in the lower area of a copper plate of the crystallizer is adjusted to 20-28 ℃ from the original 24-28 ℃, the water outlet temperature is controlled to 24-35 ℃, the cooling strength of the blank shell in the lower area of the crystallizer is strengthened by adjusting the temperature parameters of inlet and outlet water, and the thickness of the blank shell out of the crystallizer is improved.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710064855.4A CN108393445B (en) | 2017-02-05 | 2017-02-05 | Peritectic steel slab continuous casting crystallizer copper plate and water cooling method |
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| CN201710064855.4A CN108393445B (en) | 2017-02-05 | 2017-02-05 | Peritectic steel slab continuous casting crystallizer copper plate and water cooling method |
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| CN108393445A CN108393445A (en) | 2018-08-14 |
| CN108393445B true CN108393445B (en) | 2019-12-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109351928A (en) * | 2018-10-10 | 2019-02-19 | 北京首钢股份有限公司 | A method of preventing hypo-peritectic steel surface longitudinal crack of slab |
| CN115351248B (en) * | 2022-10-18 | 2023-01-06 | 东北大学 | Crystallizer copper pipe for high-casting-speed continuous casting |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59225858A (en) * | 1983-06-06 | 1984-12-18 | Nippon Steel Corp | Mold for continuous casting |
| JPH01170551A (en) * | 1987-12-24 | 1989-07-05 | Nkk Corp | Mold for continuously casting steel |
| JPH06285606A (en) * | 1993-03-31 | 1994-10-11 | Sumitomo Metal Ind Ltd | Method for continuously casting steel |
| JPH0751804A (en) * | 1993-08-20 | 1995-02-28 | Nippon Steel Corp | Mold for continuous casting |
| JPH0994635A (en) * | 1995-09-29 | 1997-04-08 | Sumitomo Metal Ind Ltd | Method for continuously casting steel |
| JPH10128513A (en) * | 1996-10-30 | 1998-05-19 | Sumitomo Metal Ind Ltd | Division mold for continuous casting |
| CN2936495Y (en) * | 2006-07-15 | 2007-08-22 | 西峡龙成特种材料有限公司 | Heat top crystallizer form work of meniscus area narrow shallow water channel |
| CN201211556Y (en) * | 2008-07-01 | 2009-03-25 | 西峡龙成特种材料有限公司 | Binary cooling type thin slab continuous casting crystallizer |
| CN205324668U (en) * | 2016-01-21 | 2016-06-22 | 河北钢铁股份有限公司 | Can improve conventional slab continuous casting crystallizer of meniscus heat transfer homogeneity |
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