CN113198857A - Method for improving quality consistency of upper surface and lower surface of strip steel - Google Patents
Method for improving quality consistency of upper surface and lower surface of strip steel Download PDFInfo
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- CN113198857A CN113198857A CN202110398926.0A CN202110398926A CN113198857A CN 113198857 A CN113198857 A CN 113198857A CN 202110398926 A CN202110398926 A CN 202110398926A CN 113198857 A CN113198857 A CN 113198857A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 107
- 239000010959 steel Substances 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 238000005096 rolling process Methods 0.000 claims abstract description 32
- 238000001816 cooling Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims description 28
- 230000006872 improvement Effects 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004075 alteration Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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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
-
- 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
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
Abstract
The invention particularly relates to a method for improving the quality consistency of the upper surface and the lower surface of strip steel, which belongs to the technical field of steel rolling and comprises the following steps: fine descaling the strip steel; performing finish rolling on the steel strip after finish rolling, wherein in the finish rolling process, water between frames of adjacent finish rolling mills is supplied, the water between frames comprises water between an upper surface frame and water between a lower surface frame, and the water flow rate of the water between the lower surface frames is at least 40% higher than that of the water between the upper surface frames; carrying out layer cooling on the finish-rolled strip steel to obtain the strip steel with high upper and lower surface quality consistency; through the independent control of water between the upper surface frame and the lower surface frame, different water flows are adopted, the water flow between the lower surface frame is higher than the upper surface by 40%, and the improvement of the quality uniformity of the upper surface and the lower surface is facilitated.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a method for improving the quality consistency of the upper surface and the lower surface of strip steel.
Background
With the increase of the homogenization competition of steel products and the improvement of user requirements, the quality of the surface quality of strip steel and the control capability of a production line become more and more important standards for measuring the comprehensive treatment of products and the production capability of steel plants. Wherein the surface quality of the hot rolled strip has a decisive influence on the surface quality of the subsequent final product. Due to the characteristics of the hot rolling process, the quality difference of the upper surface and the lower surface of the strip steel is large, and the quality difference of the upper surface and the lower surface of the strip steel is mainly shown to be inferior to that of the upper surface, so that the quality difference of the upper surface and the lower surface after subsequent acid washing and heat treatment is further increased, and the comprehensive quality of products and the use of users are influenced.
Disclosure of Invention
In view of the above, the present invention has been made to provide a method for improving the consistency of the quality of the upper and lower surfaces of a steel strip that overcomes or at least partially solves the above-mentioned problems.
The embodiment of the invention provides a method for improving the quality consistency of the upper surface and the lower surface of strip steel, which comprises the following steps:
fine descaling the strip steel;
performing finish rolling on the strip steel after finish rolling, wherein in the finish rolling process, water between frames of adjacent finish rolling mills is supplied, the water between the frames comprises water between an upper surface frame and water between a lower surface frame, and the water flow rate of the water between the lower surface frames is at least 40% higher than that of the water between the upper surface frames;
and carrying out layer cooling on the finish-rolled strip steel to obtain the strip steel with high upper and lower surface quality consistency.
Optionally, the horizontal water volumes of the water between the lower surface racks and the water between the upper surface racks are respectively kept consistent.
Optionally, in the fine descaling process, the water flow of the lower header of the fine descaling is at least 20% higher than that of the upper header of the fine descaling.
Optionally, in the fine descaling process, a distance a between the upper header of the fine descaling and the strip steel and a distance b between the lower header of the fine descaling and the strip steel satisfy the following relationship: a is more than or equal to 1.09b and less than or equal to 1.45 b.
Optionally, in the fine descaling process, the distance between the upper collecting pipe of the fine descaling and the hot rolled strip steel is 120-130mm, and the distance between the lower collecting pipe of the fine descaling and the hot rolled strip steel is 90-110 mm.
Optionally, in the fine descaling process, the overlapping amount c of the water flow fan surface of the upper fine-descaling header and the overlapping amount d of the water flow fan surface of the lower fine-descaling header satisfy the following relationship: c is more than or equal to 1.5d and less than or equal to 3.5 d.
Optionally, in the fine descaling process, the overlapping amount of the water flow sector of the upper fine descaling header is controlled to be 20-25mm, and the overlapping amount of the water flow sector of the lower fine descaling header is controlled to be 8-12 mm.
Optionally, in the fine descaling process, the impact force e of the upper fine descaling header and the impact force f of the lower fine descaling header satisfy the following relationship: e is more than or equal to 0.5f and less than or equal to 0.8 f.
Optionally, in the fine descaling process, the hitting force of the upper header of the fine descaling is controlled to be 0.7N/mm2The striking force of the lower collecting pipe for fine descaling is controlled to be 1.2N/mm2The above.
Optionally, in the finish rolling and layer cooling process, the distance of the strip steel exposed to the air is less than or equal to 15m, and the strip speed of the strip steel is 9-12 m/s.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the method for improving the quality consistency of the upper surface and the lower surface of the strip steel provided by the embodiment of the invention comprises the following steps: fine descaling the strip steel; performing finish rolling on the steel strip after finish rolling, wherein in the finish rolling process, water between frames of adjacent finish rolling mills is supplied, the water between frames comprises water between an upper surface frame and water between a lower surface frame, and the water flow rate of the water between the lower surface frames is at least 40% higher than that of the water between the upper surface frames; carrying out layer cooling on the finish-rolled strip steel to obtain the strip steel with high upper and lower surface quality consistency; through the independent control of water between the upper surface frame and the lower surface frame, different water flows are adopted, the water flow between the lower surface frame is higher than the upper surface by 40%, and the improvement of the quality uniformity of the upper surface and the lower surface is facilitated.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
FIG. 2 is a graph of a Pasteur Tay inspection of the lower surface of a strip of the process 1 provided in example 1 of the present invention;
FIG. 3 is a graph of the Perfect Table inspection of the lower surface of the strip of Process 2 according to example 1 of the present invention.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the applicant finds in the course of the invention that: the factors influencing the consistency of the quality of the upper surface and the lower surface of the strip steel are as follows:
1. influence of water between frames
And water between frames of adjacent rolling mills in the finish rolling section is arranged between the frames, and the water between the frames mainly has the functions of cooling the strip steel and removing foreign matters on the surface of the strip steel. The water between the upper and lower racks is usually of the same flow rate. The applicant finds that the water between the upper surface machine frame and the lower surface machine frame is independently controlled, and different water flows are adopted, so that the quality uniformity of the upper surface and the lower surface is improved.
According to an exemplary embodiment of the present invention, there is provided a method for improving quality uniformity of upper and lower surfaces of a steel strip, the method comprising:
the method comprises the following steps of carrying out fine descaling, fine rolling and layer cooling on hot-rolled strip steel to obtain strip steel with high upper and lower surface quality consistency, wherein in the fine rolling process, water between frames of adjacent fine rolling mills is arranged between the frames, the water between the frames comprises water between the upper surface frames and water between the lower surface frames, and the water flow rate of the water between the lower surface frames is at least 40% higher than that of the water between the upper surface frames.
As an optional implementation mode, the horizontal water yield of water between the lower surface frame and the upper surface frame is kept consistent respectively, and during specific operation, the water tank must adopt stainless steel material between the frame, adopts high-pressure squirt to clear up after every time the machine is taken off, is favorable to guaranteeing horizontal water yield uniformity.
2. Influence of Fine descaling
In the hot rolling process, before the strip steel enters a finish rolling area, the strip steel is firstly subjected to a fine descaling process, the effect of removing the iron scales on the surface of the strip steel through high-pressure water blasting is realized, and the removal effect of the iron scales is not only related to descaling parameters, but also related to the surface state of the strip steel. In addition, the applicant also found that the spraying of high-pressure water in the fine descaling process can significantly affect the surface temperature of the strip steel besides affecting the removal of the scale on the surface of the strip steel. In summary, in designing the fine descaling parameters, not only the descaling parameters such as the striking force, but also the temperature state of the striking surface of the strip steel and the factors of the surface temperature drop of the strip steel caused by high-pressure water are considered.
Production line practice and theoretical research show that the temperature of the lower surface of the strip steel is slightly higher than that of the upper surface, and the temperature difference is a main reason for causing the quality difference of the upper surface and the lower surface of the hot rolled strip steel finished product and the pickled upper surface and the pickled lower surface. Through a large number of practical gropes, the method for differentially controlling the parameters of the fine descaling upper and lower surface collecting pipes is provided, and the method relates to multiple aspects of collecting pipe height, sector overlapping quantity, hitting force, water flow and the like.
Specifically, the water flow of a lower fine descaling header is at least 20% higher than that of an upper fine descaling header, the distance between the upper fine descaling header and the hot rolled strip steel is controlled to be 120-130mm, the distance between the lower fine descaling header and the hot rolled strip steel is controlled to be 90-110mm, the overlapping amount of the water flow sector of the upper fine descaling header is controlled to be 20-25mm, the overlapping amount of the water flow sector of the lower fine descaling header is controlled to be 8-12mm, and the impact force of the upper fine descaling header is controlled to be 0.7N/mm during the fine descaling process2The striking force of the lower collecting pipe for fine descaling is controlled to be 1.2N/mm2The above.
The reason that the water flow of the lower collecting pipe for fine descaling is controlled to be at least 20 percent higher than that of the upper collecting pipe for fine descaling is that the temperature of the lower surface of the strip steel is higher than that of the upper surface, and the adverse effect of over-low value is not beneficial to cooling the lower surface;
the reason that the distance between the upper collecting pipe for controlling the fine descaling and the hot rolled strip steel is controlled to be 120-130mm, and the distance between the lower collecting pipe for controlling the fine descaling and the hot rolled strip steel is controlled to be 90-110mm is that compared with the distance between the upper surface and the lower surface of the hot rolled strip steel, the distance between the lower collecting pipe for controlling the fine descaling and the lower surface of the hot rolled strip steel is properly shortened, so that the descaling impact force can be enhanced, and the descaling effect is improved.
The reason why the overlap amount of the water flow sectors of the upper collecting pipe for controlling the fine descaling is controlled to be 20-25mm and the overlap amount of the water flow sectors of the lower collecting pipe for controlling the fine descaling is controlled to be 8-12mm is that the reduction of the overlap amount of the lower surface is beneficial to the descaling effect of the sector joint position.
The striking force of the upper collecting pipe for controlling fine descaling is controlled to be 0.7N/mm2The striking force of the upper and fine descaling lower collecting pipes is controlled to be 1.2N/mm2The reason is that the difference control of the descaling hitting force of the upper surface and the lower surface is determined by combining the quality of the upper surface and the quality of the lower surface of the strip steel, and the balance of the quality of the upper surface and the lower surface is facilitated.
3. Influence of strip steel exposed to air
After the strip steel leaves the finish rolling area and before the strip steel enters a laminar flow water cooling area, an area of the strip steel exposed in the air often exists, and the strip steel is completely exposed in the air because no cooling water is sprayed in the area. Because the strip steel just exits from the finish rolling area at the moment, the temperature is high, the surface oxidation is very easy to be intensified after the strip steel contacts with the air, and oxidation defects on a plurality of hot rolled strip steel finished products, particularly the defects on the lower surface of the hot rolled strip steel, are directly related to the area of the strip steel contacting with the air. Therefore, the distance of this section in direct contact with the air should be minimized.
Some steel mills are provided with ultra-fast cooling equipment in the area, which is used for producing pipeline steel and other products with special requirements on cooling speed and mechanical properties of the products, and the ultra-fast cooling equipment is not started when other steel grades are produced. Production line practice shows that for the production line design, an ultra-fast cooling low-pressure mode is required to be started when steel with high surface quality requirements is produced, and the effect is to seal the surface of the hot-rolled strip steel by water and avoid the direct contact of the strip steel and air. And for a production line without the ultra-fast cooling equipment, a front cooling header of the laminar cooling water process section is started, and the contact time of the strip steel and air is reduced by adopting a front intensive cooling strategy or a full-section sparse cooling strategy.
In an alternative embodiment, the strip is exposed to air for a distance of 15m or less and has a strip speed of 9 to 12m/s between the finish rolling and the layer cooling.
The method for improving the consistency of the quality of the upper surface and the lower surface of the strip steel according to the present application will be described in detail with reference to examples, comparative examples and experimental data.
Experimental example 1
Taking the production of IF steel with the thickness of 5mm as an example, the water flow between the racks on the upper surface and the lower surface between the finishing mill racks is respectively controlled, the same water flow between the racks on the upper surface and the lower surface in the process 1 is adopted, the water flow between the racks on the lower surface in the process 2 is increased by 40 percent, and the corresponding lower surface appearances of the hot-rolled strip steel under different processes are shown in figures 2 and 3. It can be seen from the figure that after the water flow is increased on the lower surface, the condition that the original lower surface is made of black foreign matters is obviously improved.
Experimental example 2
Taking the production of IF steel with the thickness of 4mm as an example, the detailed process parameters and the ratio of the upper surface to the lower surface to be consistent and better are shown in the following table, wherein the distance between the upper collecting nozzle and the lower collecting nozzle of the fine descaling nozzle and the surface of the strip steel, the water flow sector overlapping amount and the striking force are respectively controlled.
As can be seen from the above table, under the conditions of the original process 1, the black strip-shaped color difference exists on the surface of the hot-rolled strip steel after pickling, the lower surface is especially serious, and the good proportion of the upper surface to the lower surface is only 50%. After the adjustment to the process 2, the condition of black strip-shaped chromatic aberration on the surface is obviously improved, but the chromatic aberration on the lower surface is still obvious, and the consistent and better proportion of the upper surface and the lower surface is improved to 70%. The process is adjusted to the process 3, the descaling headers on the upper surface and the lower surface are differentially controlled, the brightness degree of the lower surface is obviously improved, and the consistent and better proportion of the upper surface and the lower surface is improved to 90 percent.
Experimental example 3
Taking the production of IF steel with the thickness of 3mm as an example, the distances of the strip steel exposed in the air between the finish rolling outlet and the laminar flow water cooling section are respectively controlled to be 20m, 15m and 10m, after the distances, the laminar flow water cooling is started for conventional cooling, and other hot rolling process parameters are kept unchanged. The analysis and statistics of the thickness and the phase composition of the iron scales on the upper surface and the lower surface of the hot-rolled strip steel after the production are carried out, and the results are shown in
Shown in table 1.
After the strip steel is subjected to finish rolling and exposed in the air, the distance is shortened from 20m to 15m, the thickness of the iron scale is reduced from 14-18 mu m to 10-12 mu m, the thickness difference of the iron scales on the upper surface and the lower surface is reduced from 4 mu m to 2 mu m, the proportion of FeO in the iron scale is increased from less than 5% to 18% -20%, and the increase of the proportion of FeO is beneficial to the removal of the iron scale in the subsequent pickling process. Further shortening the distance to 10m further improves the thickness and phase condition of the scale, but with a smaller amplitude.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) according to the method provided by the embodiment of the invention, the quality uniformity of the upper surface and the lower surface is improved by adopting different water flows between the upper surface frame and the lower surface frame;
(2) the method provided by the embodiment of the invention reduces the temperature difference of the upper surface and the lower surface of the strip steel through a method for controlling the parameters of the headers on the upper surface and the lower surface of the fine descaling through differentiation, and relates to the aspects of header height, sector overlapping amount, hitting power, water flow and the like, so that the quality difference of the upper surface and the lower surface of the hot rolled strip steel and the quality difference of the upper surface and the lower surface of the pickled hot rolled strip steel caused by the temperature difference are reduced;
(3) the method provided by the embodiment of the invention reduces the exposure time of the strip steel in the air by reducing the distance of the strip steel entering the laminar flow water cooling area after the strip steel exits from the finish rolling area, and avoids the problems of surface oxidation aggravated and oxidation defects caused by the contact of the strip steel and the air;
finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for improving the quality consistency of the upper surface and the lower surface of strip steel is characterized by comprising the following steps:
fine descaling the strip steel;
performing finish rolling on the strip steel after finish rolling, wherein in the finish rolling process, water between frames of adjacent finish rolling mills is supplied, the water between the frames comprises water between an upper surface frame and water between a lower surface frame, and the water flow rate of the water between the lower surface frames is at least 40% higher than that of the water between the upper surface frames;
and carrying out layer cooling on the finish-rolled strip steel to obtain the strip steel with high upper and lower surface quality consistency.
2. The method for improving the quality consistency of the upper surface and the lower surface of the strip steel according to claim 1, wherein the horizontal water volume of the water between the lower surface racks and the horizontal water volume of the water between the upper surface racks are respectively kept consistent.
3. The method for improving the quality consistency of the upper and lower surfaces of the steel strip as claimed in claim 1, wherein the flow rate of the lower header water of the fine descaling is at least 20% higher than that of the upper header water of the fine descaling.
4. The method for improving the quality consistency of the upper surface and the lower surface of the strip steel according to claim 1, wherein in the fine descaling process, the distance a between the upper fine descaling header and the strip steel and the distance b between the lower fine descaling header and the strip steel satisfy the following relation: a is more than or equal to 1.09b and less than or equal to 1.45 b.
5. The method for improving the quality consistency of the upper surface and the lower surface of the strip steel as claimed in claim 4, wherein the distance between the upper collecting pipe of the fine descaling and the hot rolled strip steel is 120-130mm, and the distance between the lower collecting pipe of the fine descaling and the hot rolled strip steel is 90-110mm in the fine descaling process.
6. The method for improving the quality consistency of the upper surface and the lower surface of the strip steel according to claim 1, wherein in the fine descaling process, the overlapping amount c of the water flow sector of the upper fine descaling header and the overlapping amount d of the water flow sector of the lower fine descaling header satisfy the following relation: c is more than or equal to 1.5d and less than or equal to 3.5 d.
7. The method for improving the quality consistency of the upper surface and the lower surface of the strip steel according to claim 6, wherein the water flow sector overlapping amount of the upper fine descaling header is controlled to be 20-25mm, and the water flow sector overlapping amount of the lower fine descaling header is controlled to be 8-12mm during the fine descaling process.
8. The method for improving the quality consistency of the upper surface and the lower surface of the strip steel according to claim 1, wherein in the fine descaling process, the impact force e of the upper fine descaling header and the impact force f of the lower fine descaling header satisfy the following relation: e is more than or equal to 0.5f and less than or equal to 0.8 f.
9. The method for improving the quality consistency of the upper surface and the lower surface of the steel strip according to claim 8, wherein the striking force of the upper collecting pipe for fine descaling is controlled to be 0.7N/mm in the fine descaling process2The striking force of the lower collecting pipe for fine descaling is controlled to be 1.2N/mm2The above.
10. The method of claim 1, wherein the strip is exposed to air for a distance of 15m or less between the finish rolling and the layer cooling, and the strip has a strip speed of 9 to 12 m/s.
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Application publication date: 20210803 |