CN108906885A - The method of hot-strip - Google Patents
The method of hot-strip Download PDFInfo
- Publication number
- CN108906885A CN108906885A CN201810502396.8A CN201810502396A CN108906885A CN 108906885 A CN108906885 A CN 108906885A CN 201810502396 A CN201810502396 A CN 201810502396A CN 108906885 A CN108906885 A CN 108906885A
- Authority
- CN
- China
- Prior art keywords
- strip
- temperature
- length
- target temperature
- compensation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
Abstract
The present invention provides a kind of methods of hot-strip, are used for finishing mill, including：Determine the target temperature of strip described in hot rolling；The head length and the first compensation temperature relative to the target temperature for determining the strip, and the tail length for determining the strip and the second compensation temperature relative to the target temperature；It controls the finishing mill and the tail portion progress temperature-compensating of temperature-compensating, the control finishing mill with the target temperature to the middle part progress temperature control, the control finishing mill of the strip with second hot-rolled temperature to the strip is carried out to the head of the strip with the target temperature and first hot-rolled temperature.According to the technical solution of the present invention, vertical mixing coefficient difference is eliminated, therefore does not need to cut off steel band end to end again in continuous annealing production, product lumber recovery about 0.4% is improved, while reducing accident rate, improves hourly output.
Description
Technical field
The present invention relates to metallurgical technology fields, in particular to a kind of method of hot-strip.
Background technique
Currently, hot-strip high temperature curling after generally existing strip length direction mechanical property unevenness problem, with the trade mark
For DC01, mechanical property is as shown in table 1, and strip differs greatly in the vertical mixing coefficient of different location.Not due to performance
Stablize so that being easy to appear problem in punch forming, and then be not able to satisfy automobile steel subsequent forming technique.In order to eliminate longitudinal property
Can difference, continuous annealing production line exit need at least steel band of 20m long is cut off end to end, on the one hand to product cut damage it is larger,
On the other hand to execute-in-place complexity, hourly output is influenced, easily cause the accident influence production
Table 1
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, one aspect of the present invention is, a kind of method of hot-strip is provided.
In view of this, technical solution of the present invention provides a kind of method of hot-strip, it is used for finishing mill, including：Really
Determine the target temperature of strip described in hot rolling；The head length and first relative to the target temperature for determining the strip compensate
Temperature, and the tail length for determining the strip and the second compensation temperature relative to the target temperature；Control the finish rolling
Machine carries out temperature-compensating, the control finishing mill with head of first compensation temperature to the strip with the target temperature
To carried out in the middle part of the strip it is cooling, control the finishing mill and carried out with tail portion of second compensation temperature to the strip
Compensation, wherein the sum of head length, middle part length and tail length of the strip are the total length of strip.
Further, the method for hot-strip further includes：Pass through target temperature, the observed temperature to a upper strip
The self study of rate of heat exchange is carried out, first compensation temperature, the target temperature and second compensation temperature are adjusted.
Further, the head length of the determination strip and the first compensation relative to the target temperature are warm
Degree, and determine the tail length of the strip with relative to the second compensation temperature of the target temperature before, further include：Setting
The head length of the strip and first compensation temperature, and set the tail length and second compensation of the strip
Temperature, the mechanical property of the length direction of the strip determines the head length of the strip by historical data after measurement hot rolling
Degree and the first compensation temperature relative to the target temperature, and determine the tail length of the strip with relative to the target
Second compensation temperature of temperature.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages：
Behind head to strip and tail temperature compensation, vertical mixing coefficient difference is eliminated, therefore raw in continuous annealing
It does not need to cut off steel band end to end again when production, improves product lumber recovery about 0.4%, while reducing accident rate, improve hour
Yield.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, wherein：
Fig. 1 shows the flow diagram of the method for hot-strip according to an embodiment of the invention；
Fig. 2 shows the hot-rolled temperature curve synoptic diagrams of the method for the hot-strip of the prior art；
Fig. 3 shows the statistical chart of the yield strength of the strip of the method production of the hot-strip of the prior art；
Fig. 4 shows metallographic structure figure in the middle part of the DC01 of the strip of the method production of the hot-strip of the prior art；
Fig. 5 shows the tail portion the DC01 metallographic structure figure of the strip of the method production of the hot-strip of the prior art.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to be more clearly understood that aforementioned aspect of the present invention, feature and advantage
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Embodiment 1：
The method of hot-strip as shown in Figure 1 is used for finishing mill, including：
Step S102, determines the head length and the first hot-rolled temperature of strip, and determines the tail length and second of strip
Hot-rolled temperature；
Step S104, control finishing mill are heated with head of first compensation temperature to strip, control finishing mill with mesh
Mark temperature to carried out in the middle part of strip it is cooling, control finishing mill and heated with tail portion of second compensation temperature to strip,
Wherein, the sum of the head length of strip, middle part length and tail length are the total length of strip.
It collects and summarizes the strip consistent continuous annealing automobile steel product DC01 produced of cooling temperature performance data end to end end to end,
By the performance of contrast product medium position steel band, summary lifts one's head, the data of tail and middle part steel with performance difference.Data prove
The automobile steel product steel band of method production of the present embodiment is not used in the longitudinal direction there is difference, main rule be head,
Tail steel band performance is higher than middle part steel band performance.Reason is：In the case where hot rolling production controls normal situation, the temperature of strip overall length is
Fluctuate in surrounding target value a certain range, batch it is coiled after be cooled to room temperature during, the head and tail portion of strip because with
Air contact, cooling rate will be greater than rolling up interior steel band cooling rate, this is less than the grain size of steel band rostral-caudal in steel band
The grain size in portion will cause property in product length direction so that head and tail portion possess higher intensity than intermediate steel band in this way
Can be uneven, the serious defect for also resulting in stamping cracking.
In the prior art, using conventional refrigerating mode when hot rolling produces, temperature-compensating, hot rolling temperature are not used end to end
Write music line as shown in Fig. 2,
From figure 2 it can be seen that the head of steel band, tail portion be according to target temperature carry out control, integrated curved according to
Target temperature production.We, which have collected, uses such type of cooling belt steel product produced, end to end performance and product middle part property
The data of energy, specific data are as shown in Figure 3.
It can be seen that the difference due to hot rolling cooling velocity from statistical result, eventually led to belt steel product longitudinal direction property
The difference of energy.It is strong that the yield strength that will become apparent from rostral-caudal from the statistical data result in Fig. 3 is generally higher than middle part surrender
Degree.
Metallographic structure figure in the middle part of the DC01 of belt steel product as shown in figure 4, the tail portion the DC01 metallographic structure figure of belt steel product such as
Shown in Fig. 5, Fig. 4 metallographic structure grain size is rated 9 grades, and Fig. 5 metallographic structure grain size is rated 10 grades, same coil band metallographic
The grading difference at tissue tail portion and middle part results in the difference of yield strength.
Therefore, in order to reduce influence of the different cooling rates to strip power moral character energy, using the method hot rolling of the present embodiment
Strip.The method of the present embodiment improves hot rolling target temperature end to end by suitably setting in certain length in this length range
Degree, to eliminate performance difference caused by the cooling of the mechanical heterogeneity on later period strip length direction, it should be noted that mend
It repays temperature and refers to and the head of strip and the cold rolling temperature of tail portion are improved on the basis of the target temperature of setting, raising
Cold rolling temperature is compensation temperature.
By taking the trade mark is the strip of DC01 as an example, compensation temperature, the length of setting are as shown in table 2, mechanical property such as 3 institute of table
Show,
Table 2
Table 3
As shown in Table 3, after using the method for the hot rolled strip of the present embodiment, the deviation of vertical mixing coefficient substantially reduces.
In current strip hot rolling process, when strip steel head enters finishing mill, cooling temperature Controlling model is by strip
In length direction according to several controlled units are equidistantly divided into, in conjunction with the heat exchange coefficient of U-shaped cooling parameter and the steel grade to every
The water of a controlled unit is calculated, when strip enter layer it is cold after, strip steel head position is calculated by layer-cold roller way speed
It sets, according to the observed temperature of the controlled unit of collection, target call temperature and rate of heat exchange are calculated needed for the controlled unit
The quantity that water setting value is converted to water valve is issued to executing agency again and carries out practical control by water setting value, control system.
After cooling procedure terminates, the observed temperature data being collected into and the quantity of valve switch return and be calculated by cooling jig
To the heat exchange coefficient of strip.In the method for the present embodiment, further, model can take strip steel head, middle part and tail portion three
The observed temperature of a controlled unit carries out the self study of rate of heat exchange, can be further improved temperature control precision in this way, next
Block strip can inherit previous piece of rate of heat exchange self study when calculating as a result, making to control precision continuous improvement.
Further, it is determined that the method for head length and the first compensation temperature, tail length and the second compensation temperature is：If
Determine the head length and the first compensation temperature of strip, and set the tail length and the second compensation temperature of strip, measures hot rolling
The mechanical property of the length direction of strip afterwards, it is continuous to optimize head length and the first compensation temperature by the summary of historical data
The setting of degree, tail length and the second compensation temperature, and determine that the head length of strip is mended with first relative to target temperature
Repay temperature, the tail length of strip and the second compensation temperature relative to target temperature.
Embodiment 2：
The strip for being DC01 for the trade mark, the head length and the first compensation temperature, tail portion of the strip setting of different-thickness
Length and the second compensation temperature parameter are as shown in table 4：
Table 4
In upper table：ΔTH1:Strip steel head compensation temperature；LH1：Strip steel head length；LH2：Strip steel head transition length；
ΔTH2：Tail part of band steel compensation temperature；LT1：Tail part of band steel length；LT2：Tail part of band steel transition length.
Strip steel head transition length is set it is the target temperature in order to make head hot rolling temperature plateau drop to middle part, setting
Tail part of band steel transition length is the target temperature in order to make middle part portion hot-rolled temperature steadily be increased to tail portion.
Technical solution of the present invention is described with reference to the drawings above, according to the technical solution of the present invention, by strip
Behind head and tail temperature compensation, vertical mixing coefficient difference is eliminated, therefore do not need to cut off again end to end in continuous annealing production
Steel band improves product lumber recovery about 0.4%, while reducing accident rate, improves hourly output.
In the description of this specification, the description of term " one embodiment ", " some embodiments ", " specific embodiment " etc.
Mean that particular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one reality of the invention
It applies in example or example.In the present specification, schematic expression of the above terms are not necessarily referring to identical embodiment or reality
Example.Moreover, description particular features, structures, materials, or characteristics can in any one or more of the embodiments or examples with
Suitable mode combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (3)
1. a kind of method of hot-strip is used for finishing mill, which is characterized in that including：
Determine the target temperature of strip described in hot rolling；
The head length and the first compensation temperature relative to the target temperature for determining the strip, and determine the strip
Tail length and the second compensation temperature relative to the target temperature；
Control the finishing mill with first compensation temperature to the head of the strip carry out temperature-compensating, the control essence
Milling train with the target temperature to carried out in the middle part of the strip it is cooling, control the finishing mill with second compensation temperature pair
The tail portion of the strip carries out temperature-compensating,
Wherein, the sum of the head length of the strip, middle part length and tail length are the total length of strip.
2. the method for hot-strip according to claim 1, which is characterized in that further include：By to a upper band
The target temperature of steel, observed temperature carry out the self study of rate of heat exchange, adjust first compensation temperature, the target temperature with
Second compensation temperature.
3. the method for hot-strip according to claim 1, which is characterized in that the head length of the determination strip
With the first compensation temperature relative to the target temperature, and determine the tail length of the strip with relative to the target temperature
Before second compensation temperature of degree, further include：
The head length and first compensation temperature of the strip are set, and sets the tail length of the strip and described
Second compensation temperature, the mechanical property of the length direction of the strip determines the strip by historical data after measurement cold rolling
Head length and the first compensation temperature relative to the target temperature, and determine the tail length of the strip with relative to
Second compensation temperature of the target temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810502396.8A CN108906885B (en) | 2018-05-23 | 2018-05-23 | Method for hot rolling strip steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810502396.8A CN108906885B (en) | 2018-05-23 | 2018-05-23 | Method for hot rolling strip steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108906885A true CN108906885A (en) | 2018-11-30 |
| CN108906885B CN108906885B (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810502396.8A Active CN108906885B (en) | 2018-05-23 | 2018-05-23 | Method for hot rolling strip steel |
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| Country | Link |
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| CN (1) | CN108906885B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112760463A (en) * | 2020-12-25 | 2021-05-07 | 马鞍山钢铁股份有限公司 | Continuous annealing method of 780 MPa-grade microalloyed dual-phase steel |
| CN115228929A (en) * | 2022-07-29 | 2022-10-25 | 广西广盛新材料科技有限公司 | Temperature control method and device for strip steel production, terminal equipment and storage medium |
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| CN1483528A (en) * | 2002-09-19 | 2004-03-24 | 鞍钢集团新钢铁有限责任公司 | Three section laminar flow cooling technology for hot rolling band steel |
| CN101204717A (en) * | 2006-12-19 | 2008-06-25 | 株式会社日立制作所 | Coiling temperature control device and control method thereof |
| CN102601128A (en) * | 2011-01-24 | 2012-07-25 | 宝山钢铁股份有限公司 | Temperature difference control method for rolling pieces for steckel mill |
| CN105522004A (en) * | 2014-09-30 | 2016-04-27 | 上海梅山钢铁股份有限公司 | Control and statistical method for ship-shaped rolling temperature precision of hot-rolled strip steel |
| CN106734246A (en) * | 2016-11-21 | 2017-05-31 | 首钢京唐钢铁联合有限责任公司 | A kind of method for reducing cold-rolled biphase steel aberration |
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2018
- 2018-05-23 CN CN201810502396.8A patent/CN108906885B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1483528A (en) * | 2002-09-19 | 2004-03-24 | 鞍钢集团新钢铁有限责任公司 | Three section laminar flow cooling technology for hot rolling band steel |
| CN101204717A (en) * | 2006-12-19 | 2008-06-25 | 株式会社日立制作所 | Coiling temperature control device and control method thereof |
| CN102601128A (en) * | 2011-01-24 | 2012-07-25 | 宝山钢铁股份有限公司 | Temperature difference control method for rolling pieces for steckel mill |
| CN105522004A (en) * | 2014-09-30 | 2016-04-27 | 上海梅山钢铁股份有限公司 | Control and statistical method for ship-shaped rolling temperature precision of hot-rolled strip steel |
| CN106734246A (en) * | 2016-11-21 | 2017-05-31 | 首钢京唐钢铁联合有限责任公司 | A kind of method for reducing cold-rolled biphase steel aberration |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112760463A (en) * | 2020-12-25 | 2021-05-07 | 马鞍山钢铁股份有限公司 | Continuous annealing method of 780 MPa-grade microalloyed dual-phase steel |
| CN115228929A (en) * | 2022-07-29 | 2022-10-25 | 广西广盛新材料科技有限公司 | Temperature control method and device for strip steel production, terminal equipment and storage medium |
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| Publication number | Publication date |
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| CN108906885B (en) | 2020-06-02 |
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