CN112742880B - Method for controlling head and tail shapes of narrow-specification steel plates through local temperature difference - Google Patents
Method for controlling head and tail shapes of narrow-specification steel plates through local temperature difference Download PDFInfo
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- CN112742880B CN112742880B CN201911049451.3A CN201911049451A CN112742880B CN 112742880 B CN112742880 B CN 112742880B CN 201911049451 A CN201911049451 A CN 201911049451A CN 112742880 B CN112742880 B CN 112742880B
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- 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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2263/00—Shape of product
- B21B2263/20—End shape; fish tail; tongue
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2273/00—Path parameters
- B21B2273/12—End of product
- B21B2273/14—Front end or leading end
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2273/00—Path parameters
- B21B2273/12—End of product
- B21B2273/16—Tail or rear end
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a method for controlling the head and tail shapes of narrow-specification steel plates through local temperature difference, which comprises the steps of realizing local cooling of rolled pieces in a descaling mode and local cooling of single-pipe water flow in the middle of a roller way; the descaling mode realizes local cooling of rolled pieces and comprises the following steps: 1) A frame descaling system is arranged on the heavy and medium plate mill; 2) The middle part of the rolled piece in the width direction is cooled in the full length direction by using descaling water of a frame descaling system; the method for locally cooling the middle part of the roller way by the single-pipe water flow comprises the following steps: 1) A water flow device is arranged in the middle of a roller way of the heavy and medium plate mill; 2) And cooling the middle part of the head and the tail of the rolled piece in the width direction by using cooling water of the water flow device. The temperature distribution of the rolled piece is changed through the water system, different extensions are realized by changing the deformation resistance of the local matrix of the rolled piece, and the plane shape is improved.
Description
Technical Field
The invention relates to a hot steel plate rolling control technology, in particular to a method for controlling the head and tail shapes of narrow-specification steel plates through local temperature difference, which is particularly suitable for a medium plate production line needing to control head and tail fillets of the steel plates.
Background
In the hot rolling process of the steel industry, a plate blank with larger thickness is rolled into a steel plate with thinner thickness by a roller. The head and tail of the steel plate are uneven in extension, the volume extension restriction of the width middle part of the head and tail is small, and the extension amount is more than that of the edge part, so that the abnormal shape of the head and tail (the protruding shape of the width middle part of the head and tail is like a tongue as shown in fig. 1) is caused, and the user can be delivered after the cutting process is added. Therefore, the shape of the head and the tail of the steel plate is one of the main factors influencing the yield, and a plurality of hot rolling processes are controlled, especially in the field of thick plates. The steel rolling production lines at home and abroad adopt a plurality of plane shape control methods, and most of the steel rolling production lines adopt three types of steel rotating strategy optimization deformation, thickness difference optimization deformation and vertical roll (large side pressure) side pressure optimization deformation, and a small amount of patents for adjusting the shape of a plate blank supplied material.
Type one, steel conversion strategy optimization deformation:
the steel rolling is one of the main characteristics of a medium plate mill, the extension sequence of four sides can be changed by the steel rolling, so that the plate shape is improved, and the traditional longitudinal rolling method, the traditional transverse rolling method and the traditional comprehensive rolling method belong to the type. Related patent applications are: a method for controlling the edge plane shape of the pipeline steel with large widening ratio and high strength (CN 102974624B) and a method for rolling a thick plate (CN 102886381B).
The above 2 patents teach the optimization of steel rotation to improve the planar shape of rolled steel sheet in the case of wide gauge rolled steel sheet and short slab.
Type two, thickness difference optimization deformation:
in the last 60-70 th century, such as MAS rolling method (Mizushima Automatic plant View Pattern Con-trol System) and edging method, various methods have been developed by Japan steel enterprises, and all the methods are based on the method. Related patent applications are: WIDTHW Rolling METHOD FOR PREVENTING CAMBER OF PLATE (KR 20010083693), METHOD OF PLATE ROLLING and equipment heat (US 19820414838) (JP 19790089567), a METHOD FOR controlling the planar shape OF a wide thin PLATE based on crown control (CN 104858243B).
Type three, vertical roll (large side pressure) side pressure optimization deformation:
this type is a method of improving the uniformity of the shape and width of the head and tail by changing the local width of the rolled piece mainly through vertical rolls or a short stroke of a large side pressure. The method is widely used in a hot rolling production line, and a medium plate production line is also used to a certain extent. Related patent applications are: a continuous casting slab head and tail shape pre-control method (CN 103252347A) for reducing the cutting amount of the head and the tail of the hot rolling intermediate slab and a slab head and tail width dynamic short stroke control method (CN 103934279B).
The development of the three types of plane shape control technologies is very mature, and in the aspect of head and tail shape control, the MAS (Mizushima Automatic plant View Pattern Con-trol System) rolling method and similar technologies thereof and the vertical roll edging method are widely applied to various large hot rolling (particularly medium plate) and have very good effects. All of these techniques are implemented to change the three-dimensional size of the rolled piece at the early stage of rolling, thereby improving the head and tail shapes. The method has higher requirements on equipment investment and a model control system. The narrow-specification (the width is less than or equal to 2200mm, the broadening ratio is less than or equal to 1.2) steel plate has large extension ratio (more than or equal to 10), small rolling reduction in the width direction, high requirement on the precision of a rolling model, large head-tail fillet length, and limited effect improvement by utilizing the above modes.
Disclosure of Invention
Aiming at the defects of the head and the tail of the steel plate in the prior art, the invention aims to provide a method for controlling the head and the tail of the narrow-specification steel plate through local temperature difference, the temperature distribution of a rolled piece is changed through a water system, different extensions are realized by changing the deformation resistance of a local matrix of the steel plate, and the plane shape is improved.
In order to realize the purpose, the invention adopts the following technical scheme:
a method for controlling the head and tail shapes of narrow-specification steel plates through local temperature difference comprises the steps of realizing local cooling of rolled pieces and local cooling of single-pipe water flows in the middle of a roller way in a descaling mode;
the descaling mode realizes local cooling of rolled pieces and comprises the following steps:
1) A frame descaling system is arranged on the heavy and medium plate mill;
2) The middle part of the rolled piece in the width direction is cooled in the full length direction by using descaling water of a frame descaling system;
the method for locally cooling the middle part of the roller way by the single pipe water flow comprises the following steps:
1) A water flow device is arranged in the middle of a roller way of the heavy and medium plate mill;
2) And cooling the middle parts of the head and the tail of the rolled piece in the width direction by using cooling water of the water flow device.
Step 2) of realizing local cooling of the rolled piece in the descaling mode specifically comprises the following steps:
the method comprises the steps of firstly determining the pass of local cooling of a rolled piece, carrying out local cooling before the first pass of full longitudinal rolling, rotating the rolled piece by 90 degrees before the full longitudinal rolling, transporting the rolled piece to the position below a frame descaling system after parallel rolling in the width direction, keeping the rolled piece in a static state, starting descaling water for cooling, removing the rolled piece after cooling the upper area of the rolled piece, rotating by 90 degrees again, and carrying out longitudinal rolling with the head and the tail of the rolled piece in the rolling direction.
The descaling water cooling time is 10-90 s.
The rolled piece upper area is divided into: and dividing an edge region, a middle region and an edge region in sequence according to the width direction of the rolled piece.
And after the temperature of the upper middle area of the rolled piece is reduced by 30-200 ℃, the rolled piece is removed.
Step 2) of locally cooling the single pipe water flow in the middle of the roller way specifically comprises the following steps:
firstly, determining the pass of local cooling of a rolled piece, carrying out local cooling before the first pass of full longitudinal rolling, transporting the rolled piece to the position below a water flow device arranged in the middle of a roller way before the full longitudinal rolling, enabling the head and the tail of the rolled piece to correspond to cooling water pipes of the water flow device, starting cooling water, and cooling the internal temperature of the head and the tail of the rolled piece.
The cooling area in the middle of the head and the tail of the rolled piece is 80-300 mm.
The cooling time of the middle part of the head and the tail of the rolled piece is 30-240 s.
And after the temperature of the middle part of the head and the tail of the rolled piece is reduced by 30-200 ℃, the rolled piece is removed.
The method for controlling the head and tail shapes of the narrow-specification steel plate through the local temperature difference can realize the local temperature reduction (surface temperature reduction of about 30-200 ℃) of the middle part in the head and tail width direction of a rolled piece (steel plate) with the width of less than or equal to 2200mm, the broadening ratio of less than or equal to 1.2 and the extension ratio of more than or equal to 10 through a rolling mill descaling system and/or a simple local temperature reduction collecting pipe, the deformation resistance of a temperature reduction area is increased before full longitudinal rolling at the implementation moment, the flow of the volume of the middle part can be reduced in the longitudinal rolling process, and the length of a head and tail fillet (tongue) after rolling is reduced.
Drawings
FIG. 1 is a schematic representation of the deformation of a prior art rolled product during free rolling to form a head-to-tail fillet;
FIG. 2 is a schematic diagram of the distribution of the upper region of the rolled piece when the local cooling of the rolled piece is achieved in the descaling mode of the method of the present invention;
FIG. 3 is a schematic diagram showing the distribution of the upper region of a rolled piece during the local cooling of a single tube water flow in the middle of a roller way in the method of the invention;
FIG. 4 is a schematic diagram of the principle of utilizing a rack descaling system to achieve local temperature difference of rolled pieces in the method of the present invention;
FIG. 5 is a schematic illustration of the local temperature differential of the product being rolled (when rotated 90 degrees) using the water flow means in the method of the present invention;
FIG. 6 is a logic diagram of FIG. 4 for achieving localized temperature differentials across the product using the rack descaling system;
FIG. 7 is a logic diagram of FIG. 5 for achieving localized temperature differentials across the product using the water flow means.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to fig. 2 to 7, the method for controlling the head and tail shapes of narrow-specification steel plates through local temperature difference provided by the invention comprises a descaling mode to realize local cooling of rolled pieces and local cooling of single-pipe water flow in the middle of a roller way;
preferably, the descaling mode realizes local temperature reduction of the rolled piece, and comprises the following steps, please refer to fig. 4 first,
1) A frame descaling system 2 is arranged on the heavy and medium plate mill 1;
2) The full-length direction cooling is carried out on the middle part 3b of the rolled piece 3 in the width direction by utilizing descaling water of the frame descaling system 2, and the method specifically comprises the following steps:
firstly, determining the pass of local cooling of a rolled piece 3, carrying out local cooling before the first pass of full longitudinal rolling, before carrying out full longitudinal rolling, rotating the rolled piece 3 by 90 degrees (clockwise or anticlockwise), after carrying out parallel rolling in the width direction, transporting the rolled piece 3 to the position below a frame descaling system 2, enabling the rolled piece 3 to be in a static state, starting descaling water for cooling, dividing an edge area 3a, a middle area 3b and an edge area 3c on the rolled piece 3 in sequence according to the width direction of the rolled piece 3, removing the rolled piece 3 after the temperature of the middle area 3b is reduced by 30-200 ℃, rotating by 90 degrees again, and carrying out longitudinal rolling with the head and the tail as the rolling direction.
Preferably, the descaling water cooling time is related to the thickness of the rolled piece 3 and is closed according to the plate thickness timing within 10-90 s.
Preferably, the partial temperature reduction of the single-pipe water flow in the middle of the roller way comprises the following steps, please refer to fig. 5,
1) A water flow device 5 is arranged in the middle of a roller way 4 of the heavy and medium plate mill;
2) Utilize rivers device 5's cooling water, cool off 3 head and the tail width direction middle parts of rolled piece, specifically be:
firstly, determining the pass of local cooling of a rolled piece 3, carrying out local cooling before the first pass of full longitudinal rolling, before the full longitudinal rolling, transporting the rolled piece 3 to the middle part of a roller way 4 below a water flow device 5, enabling the head and the tail of the rolled piece 3 to correspond to cooling water pipes of the water flow device 5, starting cooling water, and cooling the middle parts 3d and 3e of the head and the tail of the rolled piece 3.
Preferably, the cooling area of the head and tail middle parts 3d and 3e of the rolled piece 3 is 80-300 mm, which mainly refers to the length direction, that is, the length distance extending from the side edge to the middle part of the head and tail middle parts 3d and 3e of the rolled piece 3, as shown in reference L in fig. 3.
Preferably, the cooling time of the head and tail middle parts 3d and 3e of the rolled piece 3 is 30 to 240s, and the specific cooling time is set according to the plate thickness and the temperature calculation.
Preferably, the rolled piece is removed after the temperature of the middle parts 3d and 3e at the head and the tail of the rolled piece 3 is reduced by 30-200 ℃.
The method changes the temperature distribution of the rolled piece through the water system, realizes different extensions by changing the deformation resistance of the local matrix of the rolled piece, and improves the plane shape. According to the temperature deformation resistance curve of the steel, the deformation resistance of the steel is small when the temperature is high, the deformation resistance of the steel is large when the temperature is low, and the deformation resistance of the area can be changed by reducing the local temperature to influence the volume flow. Before the rolled piece is longitudinally rolled, the temperature of the middle part of the rolled piece in the head and tail width directions is reduced (see the areas 3d and 3e in fig. 3), and the temperature of the middle part of the rolled piece in the whole width direction can also be reduced (see the area 3b in fig. 2), the length direction of the rolled piece 3 in fig. 2 is the rolling direction, the upper middle area 3b of the rolled piece 3 in fig. 2 is a main temperature reduction area, and the surface temperature is reduced by 30-200 ℃ compared with the surface temperature of the two edge areas 3a and 3 c. In the figure 3, the middle parts 3d and 3e of the head and the tail of the rolled piece 3 are main temperature reduction areas, and the surface temperature is reduced by 30-200 ℃ compared with the surface temperature of the rest areas. The specific temperature value is determined by the specification of the rolled piece and the temperature of the rolled piece at the time, and the principle is that the narrower the width of the rolled piece, the larger the temperature drop is expected, the thicker the rolled piece, and the larger the temperature drop is expected. The deformation resistance of the low-temperature region is increased during rolling, the extension amount is reduced, the protruding area of the head and the tail of a rolled piece is reduced, the metal flow of the edge part is similar to the metal flow of the middle part, and the purpose of improving the head and tail shapes is achieved.
The method has the advantages that the cooling mode of the rolled piece is water system cooling, the efficiency is high, and the method is easy to realize. Particularly, modern medium and heavy plate rolling mills are provided with a frame descaling system, the pressure of the frame descaling system is high, moving rolled pieces are descaled in normal use, and if the frame descaling system is used for statically spraying a local area, the area cooling is very obvious. The medium plate rolling mill is provided with a steel rotating roller way, can realize the turning of a rolled piece, can be matched with a conveying roller way, turns the rolled piece to be conveyed to the position below a descaling device in parallel with a descaling water system, and can cool the middle part of the rolled piece in the width direction in the full-length direction by the descaling water.
In addition, a simple water flow device is arranged in the middle of the roller way close to the rolling mill to cool the middle of the head and tail width directions of the rolled piece. The method can be used in hot rolling and medium plate production lines.
Example 1
Rolled stock slab size 250 x 1900 x 3061mm, rolled target size 16 x 2200 x 38300mm. Rolling one block by a conventional method, and measuring head fillets by about 730mm (close tails) after rolling;
and the second block adopts a frame to descale so as to realize local temperature difference rolling. The thickness before full longitudinal rolling was confirmed to be 195mm, at which time the steel sheet length was 3263mm, the width was 2189mm, and the steel sheet temperature was about 1100 ℃. Firstly, the head and tail directions of the steel plate are vertical to the rolling direction, the roll gap is opened to 235mm, the steel plate runs to the position below the descaling surface of the rolling mill (the middle part of the steel plate is similar to the position under the descaling surface), the descaling opening time is 50s, the steel plate is closed (the calculated temperature is reduced by 60 ℃), and the steel plate is rotated to the head and tail directions to be the same as the rolling direction. The fillet length of the head part is 470mm (the tail part is close) after rolling, and the implementation effect is obvious.
Example 2
Rolled piece slab size 300 x 1500 x 3165mm, rolled target size 18 x 1700 x 44000mm. Rolling one block by a conventional method, and measuring the head fillet by about 880mm (the tail part is close) after rolling;
and the second block adopts a frame to descale to realize local temperature difference rolling. The thickness before full longitudinal rolling was 251mm, and at this time, the steel sheet length was 3331mm, the width was 1704mm, and the steel sheet temperature was about 1120 ℃. Firstly, the head and tail directions of the steel plate are vertical to the rolling direction, the roll gap is opened to 296mm, the steel plate runs to the position below the descaling of a rolling mill (the middle part of the steel plate is similar to the position under the descaling), the descaling is opened for 70s and closed (the calculated temperature is reduced by 80 ℃), and the steel plate rotates to the head and tail directions and is the same as the rolling direction. The head fillet length is 560mm (the tail is close) after rolling, and the implementation effect is obvious.
Example 3
Rolled piece slab size 180 × 1300 × 2680mm, rolled target size 12 × 1320 × 38000mm. Rolling one block by a conventional method, and measuring head fillets by about 920mm (tail parts are close) after rolling;
and the second block adopts a frame to descale so as to realize local temperature difference rolling. The thickness before full longitudinal rolling was confirmed to be 180mm, the steel sheet length was 2680mm, the width was 1300mm, and the steel sheet temperature was about 1150 ℃. Firstly, the head-tail direction of a steel plate is vertical to the rolling direction, a roll gap is opened to 230mm, the steel plate runs below the descaling of a rolling mill (the middle part of the steel plate is similar to the position under the descaling), the descaling is opened for 40s and closed (the calculated temperature is reduced by 80 ℃), and the steel plate rotates to the head-tail direction and is the same as the rolling direction. The fillet length of the head part after rolling is 630mm (the tail part is close), and the implementation effect is obvious.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that the changes and modifications of the above embodiments are within the scope of the appended claims as long as they are within the true spirit of the present invention.
Claims (9)
1. A method for controlling the head and tail shapes of narrow-specification steel plates through local temperature difference is characterized by comprising the following steps: the method comprises the steps of realizing local cooling of rolled pieces in a descaling mode and local cooling of single-pipe water flow in the middle of a roller way;
the descaling mode realizes local cooling of rolled pieces and comprises the following steps:
1) A frame descaling system is arranged on the heavy and medium plate mill;
2) The middle part of the rolled piece in the width direction is cooled in the full length direction by using descaling water of a frame descaling system;
the method for locally cooling the middle part of the roller way by the single-pipe water flow comprises the following steps:
1) Arranging a water flow device in the middle of a roller way of the heavy and medium plate mill;
2) And cooling the middle part of the head and the tail of the rolled piece in the width direction by using cooling water of the water flow device.
2. The method for controlling the head-tail shape of the narrow-specification steel plate through the local temperature difference as claimed in claim 1, wherein the method comprises the following steps: step 2) of realizing local cooling of the rolled piece in the descaling mode specifically comprises the following steps:
the method comprises the steps of firstly determining the pass of local cooling of a rolled piece, carrying out local cooling before the first pass of full longitudinal rolling, rotating the rolled piece by 90 degrees before the full longitudinal rolling, transporting the rolled piece to the position below a frame descaling system after the rolling direction is parallel to the width direction, keeping the rolled piece in a static state, starting descaling water for cooling, removing the rolled piece after the temperature of the upper area of the rolled piece is reduced, rotating by 90 degrees again, and carrying out longitudinal rolling by taking the head and tail directions of the rolled piece as the rolling directions.
3. The method for controlling the head-tail shape of the narrow-specification steel plate through the local temperature difference as claimed in claim 2, wherein the method comprises the following steps: the descaling water cooling time is 10-90 s.
4. The method for controlling the head-tail shape of the narrow-specification steel plate through the local temperature difference as claimed in claim 2, wherein the method comprises the following steps: the rolled piece upper region is divided into: and dividing an edge region, a middle region and an edge region in sequence according to the width direction of the rolled piece.
5. The method for controlling the head-tail shape of the narrow-specification steel plate through the local temperature difference as claimed in claim 4, wherein the method comprises the following steps: in the step 2) of realizing local cooling of the rolled piece in the descaling mode, the rolled piece is removed after the temperature of the upper middle area of the rolled piece is reduced by 30-200 ℃.
6. The method for controlling the head-tail shape of the narrow-specification steel plate through the local temperature difference as claimed in claim 1, wherein the method comprises the following steps: step 2) of locally cooling the single pipe water flow in the middle of the roller way specifically comprises the following steps:
firstly, determining the pass of local cooling of a rolled piece, carrying out local cooling before the first pass of full longitudinal rolling, transporting the rolled piece to the position below a water flow device arranged in the middle of a roller way before the full longitudinal rolling, enabling the head and the tail of the rolled piece to correspond to cooling water pipes of the water flow device, starting cooling water, and cooling the internal temperature of the head and the tail of the rolled piece.
7. The method for controlling the head-tail shape of the narrow-specification steel plate through the local temperature difference as claimed in claim 6, wherein the method comprises the following steps: the cooling area in the middle of the head and the tail of the rolled piece is 80-300 mm, and the cooling area refers to the length distance of the side edge in the middle of the head and the tail of the rolled piece extending to the middle.
8. The method for controlling the head-tail shape of the narrow-specification steel plate through the local temperature difference as claimed in claim 6, wherein the method comprises the following steps: the cooling time of the middle part of the head and the tail of the rolled piece is 30-240 s.
9. The method for controlling the head-tail shape of the narrow-specification steel plate through the local temperature difference as claimed in claim 6, wherein the method comprises the following steps: and after the temperature of the middle part of the head and the tail of the rolled piece is reduced by 30-200 ℃, the rolled piece is removed.
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