CN113042539B - Cooling method for fine control of microstructure of hot-rolled strip steel - Google Patents
Cooling method for fine control of microstructure of hot-rolled strip steel Download PDFInfo
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- CN113042539B CN113042539B CN202110317155.8A CN202110317155A CN113042539B CN 113042539 B CN113042539 B CN 113042539B CN 202110317155 A CN202110317155 A CN 202110317155A CN 113042539 B CN113042539 B CN 113042539B
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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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/24—Automatic variation of thickness according to a predetermined programme
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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
- B21B37/46—Roll speed or drive motor control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/02—Winding-up or coiling
Abstract
A cooling method for fine control of microstructure of hot rolled strip steel includes laminar cooling procedure, strip steel coiling procedure and forced air cooling procedure, in which the forced air cooling procedure is composed of a first fan region set between laminar cooling procedure and first coiling machine and a second fan region set between first coiling machine and second coiling machine, the first fan region is equipped with 4-6 axial fans, the second fan region is equipped with 2-3 axial fans, each axial fan is positioned under the roller way to make forced air cooling to strip steel running on its upper portion, each axial fan is equipped with forced air width regulating device, and the opening width and air quantity of side baffle plate of said forced air width regulating device can be regulated according to different specification strip steel. The invention can realize the adjustment of the cooling speed state in the width direction of the strip steel by forced air cooling and adjusting the opening width of the side baffle plate in the air duct, control the structure of the iron scale on the surface of the strip steel and reduce the thickness of the iron scale; and the color difference of the middle part and the edge part of the strip steel is improved and eliminated.
Description
Technical Field
The invention relates to a steel rolling technology, in particular to a cooling method for fine control of a microstructure of hot rolled strip steel.
Background
The cooling process flow of the conventional hot-rolled strip steel production is shown in FIG. 4. The laminar cooling 19 is a cooling control device arranged between the finishing mill unit 18 and the coiling in the hot strip steel mill, mainly comprises an upper spraying device, a lower spraying device, a side spraying device, a control valve group and the like, and controls the temperature of strip steel by water cooling so as to ensure the organization and the performance of the strip steel. Since the first set of laminar cooling system is applied to the production of hot rolled strip steel, the post-rolling controlled cooling technology is rapidly developed: firstly, the development of the process technology is reflected in the progress of the cooling process and the laminar flow cooling device; and secondly, the development of a control technology is reflected in the progress of a control model and a control strategy. Advanced technologies such as adding an enhanced laminar cooling section on the basis of ordinary laminar cooling; the laminar cooling device adopts a refining fine adjustment section, so that a row of gooseneck pipes can be independently controlled, and the coiling temperature of the hot-rolled strip steel is controlled to be +/-2 ℃; the laminar flow cooling device adopts a structural mode that a water tower supplies water to add a high-level water tank beside a machine, stabilizes the pressure at the position of a nozzle and achieves the purpose of improving the cooling efficiency and the cooling effect. In recent years, laminar cooling is still the current main cooling means, despite the great development of post-rolling cooling technology. Laminar cooling carries out a great deal of work on the temperature distribution of the strip steel in the length and thickness directions at home and abroad, and various cooling models are obtained. However, these models generally assume a uniform temperature distribution across the width of the strip. In the actual production process, the conditions of low temperature at the edge part and high temperature at the middle part of the strip steel exist in the width direction, the temperature nonuniformity is further increased by laminar cooling, and the temperature drop amplitude of the upper surface is larger than that of the lower surface by the laminar cooling in the thickness direction of the strip steel. The thicker the strip steel, the greater the temperature difference between the upper and lower surfaces. The uneven distribution of the strip steel width and thickness temperature leads to uneven distribution of the strip steel microstructure, uneven distribution of strip steel hardness, iron scale thickness and the like, chromatic aberration on the surface of the strip steel and increased residual stress in the strip steel.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a cooling method for fine control of the microstructure of hot rolled strip steel.
The problem of the invention is solved by the following technical scheme:
a cooling method for fine control of microstructure of hot rolled band steel includes laminar cooling step, band steel winding step, the first and second winders are set in sequence in the band steel winding step, and forced air cooling step, the forced air cooling step is composed of the first fan zone set between laminar cooling step and the first winder and the second fan zone set between the first and second winders, the first fan zone is set with 4-6 axial fans, the second fan zone is set with 2-3 axial fans, each axial fan is set under roller table to force air cooling to the band steel running on its upper part, each axial fan is set with forced air width regulator, and the opening width and air quantity of side baffle of the forced air width regulator are regulated according to different specification band steel.
The cooling method for the fine control of the microstructure of the hot-rolled strip steel is characterized in that for the strip steel with the thickness size of less than or equal to 5mm, the strip steel is subjected to forced air cooling in the first fan area after being subjected to laminar cooling, and is coiled by the first coiler; and for the strip steel with the thickness dimension larger than 5mm, carrying out forced air cooling on the strip steel in a first fan area and a second fan area after laminar cooling, and coiling the strip steel by a second coiling machine.
The cooling method for the fine control of the microstructure of the hot-rolled strip steel has the following control parameters of the forced air cooling process of the strip steel with the thickness dimension less than or equal to 5 mm:
width of side dam opening: d = (0.085 × W) strip ) X 10-10 (formula 1)
In equation 1: d is the opening width of the side baffle plate, and the unit is mm;
W strip is the nominal width of the strip steel and is unit mm;
the air volume of a single axial flow fan is as follows: f = (T) strip ×V finish XD) X100 (formula 2)
In equation 2: f is the air volume of the fan in unit m 3 /h；
T strip : nominal thickness of the strip steel in mm;
V finish : the final rolling speed of the strip steel is unit m/h;
d: the opening width of the side baffle plate is unit mm;
for the strip steel with the thickness dimension larger than 5.0mm, the control parameters of the forced air cooling process are as follows:
side dam opening width: d = (0.065 × W) strip ) X 10-10 (formula 3)
In equation 3: d: the opening width of the side baffle plate is unit mm;
W strip : nominal width of the strip steel in unit mm;
the air volume of a single axial flow fan is as follows: f = (T) strip ×v finish XD) X100 (formula 4)
In equation 4: f: air volume of fan in unit m 3 /h；
T strip : nominal thickness of the strip steel in mm;
v finish : the finishing speed of the strip steel is in unit of m/h;
d: side dam opening width, unit mm.
The cooling method for the fine control of the microstructure of the hot-rolled strip steel adopts a sparse cooling mode that each group of cooling water pipes are arranged at intervals of 1 row for the strip steel laminar cooling process with the thickness dimension of less than or equal to 5 mm; and for the strip steel laminar cooling process with the thickness dimension larger than 5mm, a dense cooling mode and a sparse cooling mode with 1 row of cooling water pipes in each group are adopted.
According to the cooling method for fine control of the microstructure of the hot-rolled strip steel, the forced air width adjusting device is arranged in a trench at the lower part of a roller way, the adjusting device comprises two adjustable side baffles, two fixed side baffles, a fan box body and an adjusting mechanism, the fan box body is fixed at the bottom of the trench, an axial flow fan is positioned in the fan box body, two sides of the fan box body are closed, the upper opening of the fan box body is connected with the fixed side plates through connecting plates, the fixed side plates are connected with the adjustable side plates through telescopic baffles, and rollers are arranged at the tops of the two adjustable side plates; the foundation positions on two sides of the top of the trench are respectively provided with a support frame, a guide rail is arranged between the two support frames, the rollers are positioned on the guide rail, each roller is respectively connected with a fixed block through a connecting rod, and the fixed blocks are connected with an adjusting mechanism.
The cooling method for the fine control of the microstructure of the hot-rolled strip steel is characterized in that the adjusting mechanism is provided with a motor, a speed reducer, belt wheels and a belt, the two belt wheels are respectively arranged on the support frames, the motor is connected with the driving belt wheel through the transmission of the speed reducer, the belt is sleeved on the two belt wheels, and the two connecting blocks are respectively and fixedly connected to the upper side edge of the belt and the lower side edge of the belt.
According to the cooling method for the fine control of the microstructure of the hot-rolled strip steel, the maximum distance between the two adjusting side plates is matched with the width of the strip steel, and the minimum distance between the two adjusting side plates is 0.5-0.6 times of the width of the strip steel.
According to the cooling method for fine control of the microstructure of the hot-rolled strip steel, the graduated scale is arranged on the guide rail.
In the cooling method for the fine control of the microstructure of the hot rolled strip steel, the distance between the axial flow fan and the strip steel is 1.3-1.8 meters.
Based on long-term field production experience, the invention provides a cooling method of laminar cooling and forced air cooling on the basis of continuous groping and repeated tests, thereby realizing the fine adjustment and control of the organization in the directions of the length, the width and the thickness of the strip steel; for thin gauge strip steel (less than or equal to 5 mm), the problem of overlarge cooling speed of laminar cooling can be improved by properly closing laminar flow water and starting a fan; for thick strip steel (more than 5 mm), the cooling effect can be enhanced by starting the fan, and the problem of insufficient cooling capacity of a laminar flow cooling system is solved; the phenomena of low upper surface temperature and high lower surface temperature of the strip steel after laminar cooling are improved and eliminated. The invention can realize the adjustment of the cooling speed state in the width direction of the strip steel by forced air cooling and adjusting the opening width of the side baffle plate in the air duct, control the structure of the iron scale on the surface of the strip steel and reduce the thickness of the iron scale; improving and eliminating the color difference of the middle part and the edge part of the strip steel; the adjusting means of controlling cooling after the strip steel is rolled is enriched, so that the structure and the performance of the strip steel are more uniform.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a schematic process diagram of the process of the present invention;
FIG. 2 is a schematic view of an axial flow fan and a forced air width adjusting device;
FIG. 3 is a side view of FIG. 2;
FIG. 4 is a schematic view of a prior art cooling process for rolling a steel strip;
FIGS. 5 and 6 are metallographic images of structures at 1/4 and 1/8 of the width of the strip steel according to example 1 of the present invention;
FIG. 7 and FIG. 8 are metallographic images of structures at 1/4 and 1/8 of the strip steel in the width direction in comparative example 1;
FIG. 9 is a color difference chart of a strip steel of example 2 of the present invention;
FIG. 10 is a color difference chart of the steel strip of comparative example 2.
The reference numbers in the figures are: 1. the device comprises strip steel, 2, conveying rollers, 3, a fixing block, 4, a connecting rod, 5, a belt, 6, a belt wheel, 7, a guide rail, 8, a supporting frame, 9, an adjustable side baffle, 10, a telescopic baffle, 11, a fixed side baffle, 12, an axial flow fan, 13, a fan box body, 14, a roller, 15, a speed reducer, 16, a motor, 17, a scale, 18, a finishing mill group, 19, a laminar flow cooling process, 20, a first fan area, 21, a first coiler, 22, a second fan area, 23 and a second coiler.
Detailed Description
The invention finds the following rule according to the long-term quality tracking detection of strip steel products with different specifications: the rolling speed of the thin strip steel is high, the cooling speed in the laminar cooling process is high, the temperature drop of the two sides of the strip steel is obviously larger than that of the middle part of the strip steel, and the texture grain size in the width direction has obvious difference. The rolling speed of the thicker-specification strip steel is low, the cooling speed in the laminar cooling process is low, the tissues of the strip steel in the width direction and the thickness direction have obvious differences, and the problem of color difference is serious. In order to solve the problems, the invention is provided with a forced air cooling process on the basis of the traditional laminar cooling. Referring to fig. 1, the forced air cooling process is composed of a first fan area 20 disposed between the laminar cooling process 19 and the first winder 21, and a second fan area 22 disposed between the first winder 21 and the second winder 23. 4-6 axial flow fans are arranged in the first fan area, 2-3 axial flow fans are arranged in the second fan area, and each axial flow fan is positioned below the roller way. The strip steel 1 delivered from the finishing mill group 18 is first cooled by entering the laminar cooling process 19, and then enters the forced air cooling process, and the air flow blown by the axial flow fan blows toward the running strip steel from bottom to top. Each axial flow fan is provided with a forced air width adjusting device, and the opening width and the air quantity of the side baffle of the forced air width adjusting device are adjusted according to different specifications of strip steel. Wherein, for the strip steel with the thickness size less than or equal to 5mm, the strip steel is forced to be air-cooled in a first area of a fan after being cooled by laminar flow, and is coiled by a first coiler; and for the strip steel with the thickness size of more than 5mm, carrying out forced air cooling on the strip steel in a first fan area and a second fan area after laminar cooling, increasing the cooling force of the forced air cooling, and then coiling the strip steel by a second coiling machine.
The control parameters of the forced air cooling process of the strip steel with the thickness dimension less than or equal to 5mm are as follows:
width of side dam opening: d = (0.085 × W) strip ) X 10-10 (formula 1)
In equation 1: d is the opening width of the side baffle plate, and the unit is mm;
W strip is the nominal width of the strip steel and is unit mm;
the air volume of a single axial flow fan is as follows: f = (T) strip ×V finish XD) X100 (formula 2)
In equation 2: f is the air volume of the fan in unit m 3 /h；
T strip : nominal thickness of the strip steel in mm;
V finish : the final rolling speed of the strip steel is unit m/h;
d: the opening width of the side baffle plate is unit mm;
for strip steel with the thickness dimension of more than 5.0mm, the control parameters of the forced air cooling process are as follows:
side dam opening width: d = (0.065 × W) strip ) X 10-10 (formula 3)
In equation 3: d: the opening width of the side baffle plate is unit mm;
W strip : nominal width of the strip steel in unit mm;
the air volume of a single axial flow fan is as follows: f = (T) strip ×v finish XD) X100 (formula 4)
In equation 4: f: air quantity of fan in unit m 3 /h；
T strip : nominal thickness of the strip steel in mm;
v finish : the final rolling speed of the strip steel is unit m/h;
d: side dam opening width, unit mm.
Referring to fig. 2 and 3, in order to flexibly adjust the width of the air flow blown out by the axial flow fan in the forced air cooling process, the invention is provided with a forced air width adjusting device. The forced air width adjusting device is arranged in a trench at the lower part of the conveying roller 2 and comprises two adjustable side baffles 9, two fixed side baffles 11, a fan box body 13 and an adjusting mechanism. The fan box body is fixed on the lower part of the trench, and the axial flow fan 12 is positioned in the fan box body. The two sides of the fan box body are closed, the upper opening of the fan box body is connected with a fixed side plate 11 through a connecting plate, the fixed side plate is connected with an adjustable side plate 9 through a telescopic baffle plate 10, and the tops of the two adjustable side plates are provided with rollers 14; the foundation positions on two sides of the top of the trench are respectively provided with a support frame 8, a guide rail 7 is arranged between the two support frames, and the roller 14 is positioned on the guide rail and can run along the guide rail. Each roller is respectively connected with a fixed block 3 through a connecting rod 4, and the fixed block is connected with an adjusting mechanism. The adjusting mechanism is provided with a motor 16, a speed reducer 15, a belt wheel 6 and a belt 5, and the belt is a synchronous toothed belt. Two belt wheels are respectively arranged on each support frame, a motor is connected with a driving belt wheel through a speed reducer in a transmission way, the belt is sleeved on the two belt wheels, and two connecting blocks are respectively and fixedly connected to the upper side edge and the lower side edge of the belt. The motor is a bidirectional motor. The motor rotates to drive the driving belt wheel to rotate, the belt and the driven belt wheel follow up, the two fixed blocks positioned on the upper side and the lower side of the belt move in the same direction or in the opposite direction, the fixed blocks drive the roller to move along the guide rail, and the roller drives the adjustable side plates to move horizontally, so that the distance between the two side plates is changed, and the cooling requirements of strip steels of different specifications are met. And a graduated scale 17 is arranged on the guide rail so as to be convenient for the accurate adjustment of the distance between the two side plates. The vertical distance between the axial flow fan and the strip steel is 1.3-1.8 m. The maximum distance between the two adjusting side plates is matched with the width of the strip steel, and the minimum distance between the two adjusting side plates is 0.5-0.6 times of the width of the strip steel.
Specific examples and comparative examples are given below:
example 1: the DC04 steel grade is rolled on a 1250mm strip steel production line, the thickness of the strip steel is 3.0mm, the width of the strip steel is 1050mm, the finish rolling temperature is 890 ℃, the finish rolling speed is 600m/min, the laminar cooling adopts a sparse cooling mode that every group has 1 row of cooling water pipes at intervals, the coiling temperature is 600 ℃, the strip steel enters a first area of a fan for forced air cooling after being subjected to laminar cooling, and then enters a first coiling machine for coiling. Basic parameters of the fan: maximum air volume 19000m 3 H, the maximum wind pressure is 700Pa, the diameter is 700mm, and the wheelbase is 1.8m (the distance between adjacent fans). The parameters of the wide band D of the opening degree of the side baffle and the air volume F of the fan are determined as follows:
D＝(0.085×W strip )×10-10
＝(0.085×1050)×10-10
＝882.5(mm)
F＝(T strip ×v finish ×D)×100
＝(3.0×600×882.5)×100×10 -6 ×60
＝9531(m 3 /h)
the detection result shows that the grain size grades of the structures at 1/4 and 1/8 of the width direction of the strip steel are the same, and the metallographic structures are respectively shown in fig. 5 and fig. 6. The lower yield strength at 1/4 position is 254MPa, the tensile strength is 330MPa, and the elongation after fracture is 48.5 percent. The lower yield strength at 1/8 position is 255MPa, the tensile strength is 328MPa, and the elongation after fracture is 49 percent. The difference of the yield strength at 1/4 and 1/8 is 1MPa, the difference of the tensile strength is 2MPa, and the difference of the elongation after fracture is 0.5%.
Comparative example 1: the DC04 steel grade rolled by the 1250mm strip steel production line has the thickness of 3.0mm, the width of 1050mm, the finish rolling temperature of 890 ℃, the finish rolling speed of 600m/min, the laminar cooling adopts a sparse cooling mode, the coiling temperature is controlled to be 600 ℃, the laminar cooling adopts the sparse cooling mode, and the air cooling process is not adopted.
The detection result shows that the difference between the grain size grades of the structures at 1/4 and 1/8 of the width direction of the strip steel is 2.0 grades, as shown in figures 7 and 8. The lower yield strength at 1/4 position is 258MPa, the tensile strength is 331MPa, and the elongation after fracture is 48.5 percent. The lower yield strength at 1/8 position is 276MPa, the tensile strength is 362MPa, and the elongation after fracture is 44.5 percent. The difference between the yield strength at the 1/4 position and the yield strength at the 1/8 position is 18MPa, the difference between the tensile strength is 31MPa, and the difference between the elongation after fracture is 4 percent.
Example 2: 700L steel grade of automobile girder steel rolled by a 1780mm strip steel production line, the thickness is 8.0mm, the width is 1500mm, the finish rolling temperature is 850 ℃, and the finish rolling speed is 200m/min. The laminar cooling adopts a dense cooling mode and a sparse cooling mode with 1 row of cooling water pipes in each group at intervals, and the coiling temperature is controlled to be 650 ℃. After being cooled by laminar flow, the strip steel enters a first fan area and a second fan area for forced air cooling, and then enters a second coiling machine for coiling. Basic parameters of the fan: maximum air volume 19000m 3 The maximum wind pressure is 700Pa, and the wheelbase is 1.8m. The side baffle opening width D and the fan air volume F parameters are determined as follows:
D＝(0.065×W strip )×10-10
＝(0.065×1500)×10-10
＝965(mm)
F＝(T strip ×v finish ×D)×100
＝(8×200×965)×100×10 -6 ×60
＝9264(m 3 /h)
in example 2, it can be seen that the color difference of the strip steel is obviously improved, as shown in fig. 9.
Comparative example 2:1780 the automobile girder steel 700L steel grade rolled by the strip steel production line has the thickness of 8.0mm, the width of 1500mm, the finish rolling temperature of 850 ℃, the finish rolling speed of 200m/min, the laminar cooling adopts a centralized and sparse cooling mode, the coiling temperature is controlled to be 650 ℃, and the air cooling process is not adopted.
The steel strip produced in the comparative example had a significant color difference between the middle and the edge, as shown in fig. 10.
Claims (7)
1. A cooling method for fine control of microstructure of hot-rolled strip steel comprises a laminar cooling process and a strip steel coiling process, wherein a first coiling machine and a second coiling machine are sequentially arranged in the strip steel coiling process, and the cooling method is characterized in that: the method also comprises a forced air cooling process, wherein the forced air cooling process consists of a first fan area arranged between the laminar cooling process and the first coiling machine and a second fan area arranged between the first coiling machine and the second coiling machine, the first fan area is provided with 4-6 axial flow fans, 2-3 axial flow fans are arranged in the second fan area, each axial flow fan is positioned below the roller way and used for performing forced air cooling on the strip steel running on the upper part of the axial flow fan, each axial flow fan is provided with a forced air width adjusting device, and the opening width and the air volume of a side baffle plate of each forced air width adjusting device are adjusted according to different specifications of strip steel;
for strip steel with the thickness size less than or equal to 5mm, carrying out forced air cooling on the strip steel through a first fan area after laminar cooling, and coiling the strip steel through a first coiler; for the strip steel with the thickness dimension larger than 5mm, the strip steel is subjected to forced air cooling in a first fan area and a second fan area after being cooled by laminar flow, and is coiled by a second coiling machine;
the control parameters of the forced air cooling process of the strip steel with the thickness dimension less than or equal to 5mm are as follows:
side dam opening width: d = (0.085 × W) strip ) X 10-10 (formula 1)
In equation 1: d is the opening width of the side baffle plate, and the unit is mm;
W strip is the nominal width of the strip steel and is unit mm;
the air volume of a single axial flow fan is as follows: f = (T) strip ×V finish XD) X100 (formula 2)
In equation 2: f is the air volume of the fan in unit m 3 /h ；
T strip : nominal thickness of the strip steel in mm;
V finish : the final rolling speed of the strip steel is unit m/h;
d: the opening width of the side baffle plate is unit mm;
for the strip steel with the thickness dimension larger than 5.0mm, the control parameters of the forced air cooling process are as follows:
side dam opening width: d = (0.065 × W) strip ) X 10-10 (formula 3)
In equation 3: d: the width of the opening of the side baffle plate is in mm;
W strip : nominal width of the strip steel in unit mm;
the air volume of a single axial flow fan is as follows: f = (T) strip ×v finish XD). Times.100 (equation 4)
In equation 4: f: air volume of fan in unit m 3 /h ；
T strip : nominal thickness of the strip steel in mm;
v finish : the final rolling speed of the strip steel is unit m/h;
d: side dam opening width, unit mm.
2. The cooling method for fine control of microstructure of hot rolled steel strip as claimed in claim 1, wherein: for the strip steel laminar cooling process with the thickness dimension less than or equal to 5mm, a sparse cooling mode with 1 row of cooling water pipes at intervals in each group is adopted; and for the strip steel laminar cooling process with the thickness dimension of more than 5mm, a dense cooling mode of 1 row of cooling water pipes at intervals in each group is adopted.
3. The cooling method for fine control of microstructure of hot rolled steel strip as claimed in claim 2, wherein: the forced air width adjusting device is arranged in a trench at the lower part of the roller way, the adjusting device comprises two adjustable side baffles, two fixed side baffles, a fan box body and an adjusting mechanism, the fan box body is fixed at the bottom of the trench, an axial flow fan is positioned in the fan box body, two sides of the fan box body are closed, the upper opening of the fan box body is connected with a fixed side plate through a connecting plate, the fixed side plate is connected with an adjustable side plate through a telescopic baffle, and rollers are arranged at the tops of the two adjustable side plates; the foundation positions on two sides of the top of the trench are respectively provided with a support frame, a guide rail is arranged between the two support frames, the rollers are positioned on the guide rail, each roller is respectively connected with a fixed block through a connecting rod, and the fixed blocks are connected with an adjusting mechanism.
4. The cooling method for fine control of microstructure of hot rolled strip as claimed in claim 3, wherein: the adjusting mechanism is provided with a motor, a speed reducer, belt wheels and a belt, the two belt wheels are respectively installed on the support frames, the motor is connected with a driving belt wheel through the transmission of the speed reducer, the belt is sleeved on the two belt wheels, and the two fixing blocks are respectively fixedly connected to the upper side edge of the belt and the lower side edge of the belt.
5. The cooling method for fine control of microstructure of hot rolled steel strip as claimed in claim 4, wherein: the maximum distance between the two adjusting side plates is matched with the width of the strip steel, and the minimum distance between the two adjusting side plates is 0.5-0.6 times of the width of the strip steel.
6. The cooling method for fine control of microstructure of hot rolled steel strip as claimed in claim 5, wherein: and a graduated scale is arranged on the guide rail.
7. The cooling method for fine control of microstructure of hot rolled steel strip as claimed in claim 6, wherein: the distance between the axial flow fan and the strip steel is 1.3-1.8 m.
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| JP4821640B2 (en) * | 2007-02-09 | 2011-11-24 | 住友金属工業株式会社 | Cooling device for material to be cooled and steel plate cooled thereby |
| CN100574916C (en) * | 2007-11-16 | 2009-12-30 | 天津钢管集团股份有限公司 | The process of hot rolled seamless steel tube On-line Control cooling |
| KR101428059B1 (en) * | 2007-12-27 | 2014-08-07 | 주식회사 포스코 | Apparatus for Cooling hot strip |
| DE102013107010A1 (en) * | 2013-07-03 | 2015-01-22 | Thyssenkrupp Steel Europe Ag | Plant and method for hot rolling steel strip |
| CN204412775U (en) * | 2014-12-24 | 2015-06-24 | 福建鼎信科技有限公司 | A kind of hot rolling line section cooling demister |
| CN208350695U (en) * | 2018-06-19 | 2019-01-08 | 宁波和邦检测研究有限公司 | A kind of thermal insulation of building door/window detection device |
| CN111872113B (en) * | 2020-06-09 | 2022-07-22 | 江苏省沙钢钢铁研究院有限公司 | Medium-high carbon steel hot-rolled wire rod and production method thereof |
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