CN106735035B - A method of reducing slab crackle - Google Patents
A method of reducing slab crackle Download PDFInfo
- Publication number
- CN106735035B CN106735035B CN201710021137.9A CN201710021137A CN106735035B CN 106735035 B CN106735035 B CN 106735035B CN 201710021137 A CN201710021137 A CN 201710021137A CN 106735035 B CN106735035 B CN 106735035B
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- temperature
- slab
- nozzle
- surface temperature
- corner
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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
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
- B22D11/1246—Nozzles; Spray heads
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The present invention relates to steel-making continuous casting technical field more particularly to a kind of methods for reducing slab crackle.The described method includes: determining target temperature according to the brittle zone temperature range of current cast slab；The target temperature is higher than the maximum temperature in the brittle zone temperature range；Obtain the surface temperature in the slab corner in conticaster bending section region；Judge whether the surface temperature is lower than the target temperature；When the surface temperature is lower than the target temperature, the flow of the nozzle for the slab corner of casting is reduced.The present invention, which realizes, reduces the technical effect that slab crackle occurs.
Description
Technical field
The present invention relates to steel-making continuous casting technical field more particularly to a kind of methods for reducing slab crackle.
Background technique
Currently, causing the surface of casting slab to be likely to occur crackle due to the high-temperature brittleness of continuous casting steel billet.Wherein, slab
Surface transverse cracks are typically normal to casting direction, are generally present in leptoprosopy edge or corner.Crack length between 1mm-10mm,
It is deep at several millimeters subcutaneous, will cause hot rolled plate edge fault of different shapes.
The technical issues of how crackle being reduced in continuous casting process exists in the prior art.
Summary of the invention
The embodiment of the invention provides a kind of methods for reducing slab crackle, for reducing slab crackle.
A method of reducing slab crackle, comprising:
According to the brittle zone temperature range of current cast slab, target temperature is determined；The target temperature is higher than described
Maximum temperature in brittle zone temperature range；
Obtain the surface temperature in the slab corner in conticaster bending section region；
Judge whether the surface temperature is lower than the target temperature；
When the surface temperature is lower than the target temperature, the stream of the nozzle for the slab corner of casting is reduced
Amount.
Optionally, the surface temperature in the slab corner in conticaster bending section region is obtained, comprising:
Non-contact type thermodetector by the way that fan-shaped section entrance is arranged in detects the surface temperature.
Optionally, the position apart from 0.5 meter -2 meters of the slab, and deviation angle is arranged in the non-contact type thermodetector
Less than or equal to 10 °.
Optionally, the non-contact type thermodetector has water-cooling circulating system, and the outside of the non-contact type thermodetector
It is provided with metal protection protector.
Optionally, the first end of the metal protection protector is provided with scavenging conduit, for from the first end to the gold
Belong to and carries out aerosol purging in protective case.
Optionally, the method also includes:
Judge whether the surface temperature is reliable；
When judging that the surface temperature is unreliable, at least one nozzle in the nozzle is closed.
Optionally, judge whether the surface temperature is lower than the target temperature, comprising:
Each preset interval, judges whether the surface temperature of newest acquisition is lower than target temperature.
Optionally, arbitrary value of the preset interval between 0.1S-5S.
Optionally, the flow for reducing the nozzle is no more than the 50% of the nozzle initial flow.Optionally, described in reduction
The flow of nozzle is no more than the 50% of the nozzle initial flow.
Beneficial effects of the present invention are as follows:
In embodiments of the present invention, it first according to the brittle zone temperature range of current cast slab, determines to be higher than crisp
The target temperature of maximum temperature in property area temperature range.Then the surface temperature in slab corner in conticaster bending section region is obtained
Degree.When judging surface temperature lower than target temperature, the flow of the nozzle for slab corner of casting is reduced.It is sprayed by reducing
Mouth flow, just reduces the secondary coolingwater in casting corner, and then improves corner temperature, and corner temperature is made to be not easy to fall into brittle zone
Temperature range and cause corner cracked.So the method in through the embodiment of the present invention, can reduce corner slab crackle
Generation.
Detailed description of the invention
Fig. 1 is the method flow diagram of the reduction slab crackle of the embodiment of the present invention；
Fig. 2 is one brittle zone temperature range schematic diagram of the embodiment of the present invention；
Fig. 3 is that the embodiment of the present invention one closes nozzle schematic diagram (towards slab outer arc direction)；
Fig. 4 is another closing nozzle schematic diagram of the embodiment of the present invention (towards slab outer arc direction).
Specific embodiment
The embodiment of the invention provides a kind of methods for reducing slab crackle, for reducing slab crackle.
In embodiments of the present invention, it first according to the brittle zone temperature range of current cast slab, determines to be higher than crisp
The target temperature of maximum temperature in property area temperature range.Then the surface temperature in slab corner in conticaster bending section region is obtained
Degree.When judging surface temperature lower than target temperature, the flow of the nozzle for slab corner of casting is reduced.It is sprayed by reducing
Mouth flow, just reduces the secondary coolingwater in casting corner, and then improves corner temperature, and corner temperature is made to be not easy to fall into brittle zone
Temperature range and cause corner cracked.So the method in through the embodiment of the present invention, can reduce corner slab crackle
Generation
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Referring to FIG. 1, to reduce the method flow diagram of slab crackle in the embodiment of the present invention.Side in the embodiment of the present invention
Method can be used in steel-making continuous casting secondary cooling water flow control system, this method comprises:
S101: according to the brittle zone temperature range of current cast slab, target temperature is determined.
S102: the surface temperature in the slab corner in conticaster bending section region is obtained.
S103: judge whether the surface temperature is lower than the target temperature.
S104: when the surface temperature is lower than the target temperature, the nozzle for the slab corner of casting is reduced
Flow.
Specifically, if being previously stored with the brittle zone temperature range of each steel grade, it can directly acquire and currently be poured
The corresponding brittle zone temperature range of cast panel base, determines target temperature.Alternatively, if can also be obtained by high temperature tension test
Brittle zone temperature range, the present invention are not particularly limited.
In S101, it is thus necessary to determine that go out target temperature.There are errors when due to obtaining brittle zone temperature range, while in order to
Surface temperature is avoided to be easy to fall into brittle zone temperature range, in embodiments of the present invention, the target temperature determined should be higher than that crisp
The maximum temperature of property area temperature range.
By taking current cast slab is the steel grade of carbon content 0.10% as an example.High temperature is carried out to the steel grade in thermal simulation machine
Stretching experiment measures the steel grade contraction percentage of area and varies with temperature curve.Assuming that measurement result is as shown in Figure 2.With section shrinkage
Rate is defined less than 60%, then the brittle zone temperature range of the steel grade is 700 DEG C -925 DEG C.Assuming that experimentation has about 15
DEG C error, accordingly, it is determined that target temperature be 940 DEG C
Next, obtaining the surface temperature in the slab corner in conticaster bending section region in S102.Specifically,
In embodiments of the present invention, S102 can be realized by following process:
Non-contact type thermodetector by the way that fan-shaped section entrance is arranged in detects the surface temperature.
Specifically, in order to obtain the temperature in slab corner, non-contact type thermodetector is arranged in fan-shaped section entrance.Its
In, if necessary to detect the temperature in outer arc corner, and then the crackle in outer arc corner is reduced, then in the fan-shaped section of outer arc angle portion direction
One or more non-contact type thermodetectors are arranged in entrance.The application those of ordinary skill in the art can according to reality into
Row setting, the present invention are not particularly limited.During specific implementation, such as 2-10 infrared colorimetric temperature measure can be set and use
In detection outer arc corner temperature.
In embodiments of the present invention, when non-contact type thermodetector is set, non-contact type thermodetector is arranged apart from slab
0.5-2 meters of position, deviation angle less than 10 °, and make as far as possible non-contact type thermodetector perpendicular alignmnet slab corner and
The middle position on surface.
Since the temperature of environment where non-contact type thermodetector is very high, in order to avoid high temperature damages non-contact type thermodetector,
Non-contact type thermodetector in embodiments of the present invention has water-cooling circulating system, and then takes away contactless survey by water circulation
The excessively high temperature of warm instrument, reduces the temperature of non-contact type thermodetector.Meanwhile non-contact type thermodetector being arranged in metal protection protector
In, high temperature is isolated.
Further, in order to avoid in the environment water mist to non-contact type thermodetector interfere, protective case first end also
It is provided with scavenging conduit.Scavenging conduit in the embodiment of the present invention is merogenesis telescoping tube, and maximal dilation length is 2 meters.Scavenging conduit is from
One end purges aerosol into metal protection protector, so that the aerosol in protective case be blown out from the other end for being different from first end.
Next, judging whether surface temperature is lower than target temperature in S103.In one implementation, Ke Yishi
When judge whether surface temperature is lower than one surface temperature of target temperature namely every acquisition, be judged as primary.Alternatively, another
In kind of implementation, can each preset interval, judge whether the surface temperature of primary newest acquisition is lower than target temperature.Its
In, in embodiments of the present invention, arbitrary value of the preset interval between 0.1S-5S.
For example, preset interval 1S, and assume that non-contact type thermodetector detects one-time surface temperature every 0.1S.For
Facilitate explanation, it is assumed that judge that the period is identical with the starting point of detection cycle.So, at the T moment, then judge contactless temperature-measuring
Whether instrument is lower than target temperature in the surface temperature that the T-0.1S moment detects.T is that any one judges start time in period.
When giving target temperature due to surface temperature, show that surface temperature may fall into brittle zone temperature range, then just
It may cause corner crack, so, when surface temperature is lower than target temperature, in S104, reduce the spray for corner of casting
The flow of mouth.
Nozzle flow is reduced due to excessive, so that the secondary cooling water flow that nozzle sprays is very few, may lead cause plate
Base is cooling insufficient and bring production accident, so, in embodiments of the present invention, nozzle flow is reduced no more than setting
The 50% of secondary coolingwater initial flow.
Due to reducing water discharge nozzle, the surface temperature of slab can be improved, so that corner temperature is not easy to fall into brittle zone
Temperature range, so, it is possible to reduce the generation of corner crack.
Further, in an alternative embodiment of the invention, the method for reducing slab crackle can further include:
Judge whether the surface temperature is reliable；
When judging that the surface temperature is unreliable, at least one nozzle in the nozzle is closed.
Specifically, judge whether surface temperature reliable, specifically can by judge the surface temperature that detect whether be
0, if not within the possible range, and/or whether fluctuate strong etc. realize.Since surface temperature is in normal continuous casting process
0 a possibility that, is minimum, therefore, if the surface temperature detected is 0, may determine that surface temperature is unreliable.Further, plate
Base surface temperature in normal continuous casting process has in zone of reasonableness, therefore, can also be with if surface temperature is not in the reasonable scope
Judge that surface temperature is unreliable.In addition, also may determine that surface temperature can not if the surface temperature fluctuation detected is strong
It leans on.Certainly, during specific implementation, those skilled in the art can also be according to its other party of actual selection
Method judges whether surface temperature is reliable, and the present invention is not particularly limited.
In order to avoid when the surface temperature detected is unreliable, the actual surface temperature of slab falls into brittle zone temperature model
It encloses, so, when judging that surface temperature is unreliable, close at least one nozzle in nozzle.
In the embodiment of the present invention, at least one nozzle for corner of casting specially is closed.For specifically how to close
At least one nozzle in nozzle should be determined according to the specific width for the slab currently cast.As an example it is assumed that application
Slab caster maximum width of casting is 2150mm, and the maximum magnitude of spray when di-cold spray nozzle standard-sized sheet is 1990mm, and nozzle
Distribution is as shown in Figure 3 and Figure 4.If the width for slab of casting is D, at least one nozzle in nozzle is closed, can be specifically included:
When the width D of the slab is less than or equal to 1750mm, the inner arc corner and outer arc corner two of the slab are closed
The nozzle of the outermost column of side；
When the width D of the slab is more than or equal to 1750mm, and is less than or equal to 1900mm, the outermost of two sides is alternately closed
The nozzle of column.
It is another pass of the embodiment of the present invention referring to FIG. 3, closing nozzle schematic diagram and Fig. 4 for the embodiment of the present invention one
Close nozzle schematic diagram.In figs. 3 and 4, nozzle is indicated with circle.In secondary cooling system, towards the direction of slab outer arc on press
Matrix-style is provided with multiple nozzles.Matrix-style is also provided with multiple nozzles on towards the direction of slab inner arc, in order to keep away
Exempt to repeat to repeat, the nozzle towards slab outer arc direction is illustrated only in the present invention.Inner arc corner and outer arc corner correspond to and lean on
Nozzle outside two sides, so spraying two cooling waters by the inside arc angle portion of nozzle leaned on outside two sides and outer arc corner when casting.
As D≤1750mm, as shown in figure 3, the nozzle of the outermost column in two sides is closed.For example, will be in Fig. 3 in dotted line frame
Nozzle is closed, and will be also switched off towards the nozzle of the similar position in interior slab inner arc direction, and then close 14 nozzles altogether.
As 1750mm≤D≤1900mm, then the nozzle of the outermost column in two sides is alternately closed.For example, will be in Fig. 4 in dotted line frame
Nozzle close, and will be also switched off towards the nozzle of the similar position in slab arc angle direction, and then close 8 nozzles altogether.
Beneficial effects of the present invention are as follows:
In embodiments of the present invention, it first according to the brittle zone temperature range of current cast slab, determines to be higher than crisp
The target temperature of maximum temperature in property area temperature range.Then the surface temperature in slab corner in conticaster bending section region is obtained
Degree.When judging surface temperature lower than target temperature, the flow of the nozzle for slab corner of casting is reduced.It is sprayed by reducing
Mouth flow, just reduces the secondary coolingwater in casting corner, and then improves corner temperature, and corner temperature is made to be not easy to fall into brittle zone
Temperature range and cause corner cracked.So the method in through the embodiment of the present invention, can reduce the hair of slab crackle
It is raw, more particularly to reduce the transverse crack of steel slab surface and corner, it is particularly corresponding to the transverse corner crack line of casting machine bending section.
Further, when the surface temperature detected is unreliable, only the nozzle in nozzle is closed, it is possible to reduce pour
The secondary cold water of cast panel base, in turn, reduce slab corner crack a possibility that.
Further, at least one nozzle is closed, secondary cold water can be effectively reduced, improves the temperature of interior arc angle and outer arc angle
Degree, to reduce the crackle of interior arc angle and outer arc angle.
In addition, the entrance setting non-contact type thermodetector in fan-shaped section is able to detect slab corner in bending section region
Temperature enables control system to get relatively true steel slab surface temperature, has filled up in conticaster bending section region
The blank of monitoring, the on-line checking for improving conticaster are horizontal.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (5)
1. a kind of method for reducing slab crackle characterized by comprising
According to the brittle zone temperature range of current cast slab, target temperature is determined；The target temperature is higher than the brittleness
Maximum temperature in area's temperature range；
Non-contact type thermodetector by the way that fan-shaped section entrance is arranged in, which detects, obtains the slab in conticaster bending section region
The position apart from 0.5 meter -2 meters of the slab, and deviation angle is arranged in the surface temperature in corner, the non-contact type thermodetector
Less than or equal to 10 °, the non-contact type thermodetector has water-cooling circulating system, and the external setting of the non-contact type thermodetector
There is metal protection protector, the first end of the metal protection protector is provided with scavenging conduit, for from the first end to the metal
Aerosol purging is carried out in protective case；
Judge whether the surface temperature is lower than the target temperature；
When the surface temperature is lower than the target temperature, the flow of the nozzle for the slab corner of casting is reduced.
2. the method as described in claim 1, which is characterized in that the method also includes:
Judge whether the surface temperature is reliable；
When judging that the surface temperature is unreliable, at least one nozzle in the nozzle is closed.
3. the method as described in claim 1, which is characterized in that judge whether the surface temperature is lower than the target temperature,
Include:
Each preset interval, judges whether the surface temperature of newest acquisition is lower than target temperature.
4. method as claimed in claim 3, which is characterized in that arbitrary value of the preset interval between 0.1s -5s.
5. the method as described in claim 1, which is characterized in that the flow for reducing the nozzle is no more than the nozzle initial flow
The 50% of amount.
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| CN201710021137.9A CN106735035B (en) | 2017-01-12 | 2017-01-12 | A method of reducing slab crackle |
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| CN201710021137.9A CN106735035B (en) | 2017-01-12 | 2017-01-12 | A method of reducing slab crackle |
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| CN106735035B true CN106735035B (en) | 2019-07-02 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107695313B (en) * | 2017-08-22 | 2019-10-11 | 中冶连铸技术工程有限责任公司 | A kind of method and arrangement of nozzles method solving slab Corner Crackss |
| CN113020561B (en) * | 2021-02-07 | 2022-10-21 | 首钢集团有限公司 | Secondary cooling control method, system, equipment and storage medium for boron-containing steel continuous casting billet |
| CN114042880A (en) * | 2021-10-15 | 2022-02-15 | 柳州钢铁股份有限公司 | Method for solving corner cracks of microalloyed steel continuous casting slab |
| CN114226666A (en) * | 2021-12-20 | 2022-03-25 | 上海弘铭冶金技术工程有限公司 | Efficient temperature compensation cooling system for high-pulling-speed production of small square billets |
| CN114850420A (en) * | 2022-04-15 | 2022-08-05 | 首钢集团有限公司 | Method and device for predicting longitudinal cracks of casting blank |
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