CN110883103A - Method for controlling uniformity of cooling temperature of rolled medium plate for ultra-fast cooling system - Google Patents
Method for controlling uniformity of cooling temperature of rolled medium plate for ultra-fast cooling system Download PDFInfo
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- CN110883103A CN110883103A CN201911200566.8A CN201911200566A CN110883103A CN 110883103 A CN110883103 A CN 110883103A CN 201911200566 A CN201911200566 A CN 201911200566A CN 110883103 A CN110883103 A CN 110883103A
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Metal Rolling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention provides a method for controlling the uniformity of cooling temperature of a rolled medium plate for an ultra-fast cooling system. According to the invention, different shielding modes are selected according to the thickness of the steel plate, the ultra-fast cooling equipment automatically opens shielding for cooling control in the cooling process, and reasonable cooling regulations are combined, so that the temperature of the steel plate is uniform, the problems of buckling and non-uniform performance of the steel plate are avoided, the straightening cost of the steel plate is reduced, and the stability of the steel plate is ensured.
Description
Technical Field
The invention belongs to the field of metallurgical cooling, and relates to a method for controlling the uniformity of cooling temperature of a medium plate after rolling, which is used for an ultra-fast cooling system.
Background
The controlled cooling technology is the core technology of the existing medium plate production, controls the finishing temperature after rolling and the starting and finishing temperature of cooling, and aims to control the structure and the performance of steel after phase change. Therefore, the ultra-fast cooling equipment is one of important equipment on a medium plate rolling production line, comprises a fixed frame, a movable frame, a lifting mechanism, a water spray cooling system, a conveying roller way and the like, is used for cooling a rolled steel plate, and adopts cooling water with certain pressure to impact the surface of the steel plate in an inclined jet manner. However, in the cooling process, the head and the tail of the steel plate often have low temperature sections, so that the temperature of the whole plate is not uniform, the quality problems of buckling, non-uniform performance and the like of the steel plate are easily caused, and the yield and the quality are influenced. The control measure used at present is to use a head and tail shielding technology, as shown in fig. 1, but the existing fixed mode head and tail shielding technology cannot adapt to steel plates with all thicknesses, and shielding with different thicknesses is not distinguished completely, so that temperature unevenness is easily caused, as shown in fig. 2, the head temperature is obviously lower than the middle part, and the temperature unevenness affects the performance control of the whole plate.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the technical problem, the invention provides a method for controlling the uniformity of the cooling temperature of a medium plate after rolling, which is used for an ultra-fast cooling system.
The technical scheme is as follows: the invention provides a method for controlling the uniformity of cooling temperature of a rolled medium plate for an ultra-fast cooling system, which comprises the following steps: cooling the steel plate on an ultra-fast cooling system, and carrying out head-tail shielding configuration with different distances and degrees on the steel plates with different thickness specifications, thereby ensuring the temperature uniformity of the steel plates in the length direction; when the thickness of the steel plate is less than or equal to 16mm, the shielding selection is that the number of the head and tail shielding nozzles is = fully opened, the head and tail shielding distance is 1000-2000mm, and the shielding coefficient is 0.7-0.9; when the thickness of the steel plate is more than 16-40 mm, the shielding selection is that the number of head and tail shielding nozzles = the total number/N, N is a natural number, N is more than or equal to 2 and less than or equal to 6, the head and tail shielding distance is 1000-2000mm, and the shielding coefficient is 0.7-0.9; when the thickness of the steel plate is more than 40mm, the shielding selection is that the head and tail shielding nozzle number is = totally closed.
Further, the steel plate is 6-150 mm thick, 900-3100 mm wide and 5000-46000 mm long.
Further, 24 groups of nozzles are arranged on the ultra-fast cooling system.
Furthermore, the water amount of each group of nozzles is set to be consistent, and the water amount of a single group of nozzles is 100-240 m3/h。
Further, the N is 2.
Further, the temperature range of the steel plate before cooling is 700-1000 ℃.
Further, the temperature range of the cooled steel plate is 200-750 ℃.
Further, the passing speed range of the steel plate on the ultra-fast cooling system is 0.3-2.0 m/s.
Has the advantages that: according to the invention, different shielding modes are selected according to the thickness of the steel plate, the ultra-fast cooling equipment automatically opens shielding for cooling control in the cooling process, and reasonable cooling regulations are combined, so that the temperature of the steel plate is uniform, the problems of buckling and non-uniform performance of the steel plate are avoided, the straightening cost of the steel plate is reduced, and the stability of the steel plate is ensured.
Drawings
Fig. 1 is a schematic diagram of special head-to-tail flow control in the background art.
Fig. 2 is a diagram of the effect of unused head and tail shielding described in the background art.
FIG. 3 is a diagram showing the effect of head-to-tail shading in example 2.
FIG. 4 is a graph showing the final cooling temperature of the steel sheet of example 2.
In the figure, 1 is a head shield and 2 is a tail shield.
Detailed Description
The invention is further explained below with reference to the drawings.
Example 1
As shown in fig. 1, the invention provides a method for controlling uniformity of cooling temperature after rolling of a medium plate for an ultrafast cooling system, which comprises the following steps:
the cooling area of the ultra-fast cooling equipment is 24 meters, 24 groups of nozzles are arranged, the water quantity of each group of nozzles is set to be consistent, and the water quantity of a single group of nozzles is100～240m3H is used as the reference value. On its ultrafast cold operation interface, set up different shielding functions, as follows:
1. the thickness is less than or equal to 16mm, the shielding is selected from the step that the number of the head and tail shielding nozzles is = fully opened, the head and tail shielding distance is 1000-2000mm, and the shielding coefficient is 0.7-0.9;
2. the thickness is more than 16-40 mm, the shielding is selected from the number of head and tail shielding nozzles = the total number/N, N is a natural number, N is more than or equal to 2 and less than or equal to 6, the head and tail shielding distance is 1000-2000mm, and the shielding coefficient is 0.7-0.9;
3. for the shielding with the thickness of more than 40mm, the selection of "head-to-tail shielding nozzle number = full-off" is carried out.
When a steel plate is rolled, the second stage of the rolling mill sends information such as the number, the steel type, the size and the like of the currently produced steel plate (the method is suitable for all produced steel types needing controlled cooling, the suitable size is 6-150 mm in thickness, 900-3100 mm in width and 5000-46000 mm in length) to an ultrafast cooling control program, at the moment, different shielding modes are selected by ultrafast cooling equipment according to the thickness, and shielding is automatically opened in the cooling process to carry out cooling control. The temperature range of the steel plate before cooling is 700-1000 ℃, the temperature range of the steel plate after cooling is 200-750 ℃, and the passing speed range of the steel plate on an ultra-fast cooling system is 0.3-2.0 m/s.
Example 2
The steel plate has the size of E9A39165000 and the steel type Q355B, and the steel plate has the thickness of 35mm, the width of 2610mm and the length of 37215 mm. The TMCP process is adopted for production, the finish rolling temperature is 839 ℃, the water inlet temperature is 778 ℃, the speed of the ultrafast cooling roller is 1.6m/s, the water temperature is controlled to be 26 +/-2 ℃, and the finish cooling temperature is 683 ℃.
By adopting the method described in the embodiment 1, the shielding function is set, the size of the steel plate is 35mm, the steel plate has the thickness more than 16-40 mm, the shielding is selected from the group consisting of head and tail shielding nozzle number = total number/N, N is 2, the head and tail shielding distance is set to 2000mm, the shielding coefficient is selected to be 0.9,
and (3) cooling parameters, opening 10 groups of nozzles in total from 7 th to 16 th, setting the water ratio to be 1.9 and setting the flow rate to be 140m for carrying out the cultivation/h. The effect of cooling the steel plate of this example 2 is shown in fig. 3, and it is apparent from fig. 3 that the temperature of the cooled steel plate is uniform after the head-to-tail shielding is used in this example. Meanwhile, the final cooling temperature of the steel plate obtained in the example is detected, and the final cooling temperature curve is shown in figure 4, so that the final cooling temperature is 685 +/-10 ℃, and the head-tail temperature difference is less than or equal to 20 ℃.
The foregoing is merely a real-time illustration of the invention, which can be quickly understood and utilized by persons of ordinary skill in the art, and numerous modifications and adaptations can be made without departing from the principles of the invention.
Claims (8)
1. A method for controlling the uniformity of cooling temperature of a medium plate after rolling for an ultra-fast cooling system is characterized by comprising the following steps: cooling the steel plate on an ultra-fast cooling system, and carrying out head-tail shielding configuration with different distances and degrees on the steel plates with different thickness specifications, thereby ensuring the temperature uniformity of the steel plates in the length direction; when the thickness of the steel plate is less than or equal to 16mm, the shielding selection is that the number of the head and tail shielding nozzles is = fully opened, the head and tail shielding distance is 1000-2000mm, and the shielding coefficient is 0.7-0.9; when the thickness of the steel plate is more than 16-40 mm, the shielding selection is that the number of head and tail shielding nozzles = the total number/N, N is a natural number, N is more than or equal to 2 and less than or equal to 6, the head and tail shielding distance is 1000-2000mm, and the shielding coefficient is 0.7-0.9; when the thickness of the steel plate is more than 40mm, the shielding selection is that the head and tail shielding nozzle number is = totally closed.
2. The method for controlling the uniformity of the cooling temperature of the rolled medium plate for the ultra-fast cooling system according to claim 1, wherein the method comprises the following steps: the thickness of the steel plate is 6-150 mm, the width is 900-3100 mm, and the length is 5000-46000 mm.
3. The method for controlling the uniformity of the cooling temperature of the rolled medium plate for the ultra-fast cooling system according to claim 1, wherein the method comprises the following steps: and 24 groups of nozzles are arranged on the ultra-fast cooling system.
4. The method for controlling the uniformity of the cooling temperature of the rolled medium plate for the ultra-fast cooling system according to claim 2, wherein the method comprises the following steps: the water amount of each group of nozzles is set to be consistent, and the water amount of a single group of nozzles is 100-240 m3/h。
5. The method for controlling the uniformity of the cooling temperature of the rolled medium plate for the ultra-fast cooling system according to claim 1, wherein the method comprises the following steps: and the N is 2.
6. The method for controlling the uniformity of the cooling temperature of the rolled medium plate for the ultra-fast cooling system according to claim 1, wherein the method comprises the following steps: the temperature range of the steel plate before cooling is 700-1000 ℃.
7. The method for controlling the uniformity of the cooling temperature of the rolled medium plate for the ultra-fast cooling system according to claim 1, wherein the method comprises the following steps: the temperature range of the cooled steel plate is 200-750 ℃.
8. The method for controlling the uniformity of the cooling temperature of the rolled medium plate for the ultra-fast cooling system according to claim 1, wherein the method comprises the following steps: the passing speed range of the steel plate on the ultra-fast cooling system is 0.3-2.0 m/s.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112387789A (en) * | 2020-10-28 | 2021-02-23 | 江苏沙钢集团有限公司 | Method for improving cooling uniformity of TMCP steel plate |
| CN113732083A (en) * | 2021-08-31 | 2021-12-03 | 五矿营口中板有限责任公司 | Ultrafast cooling method for improving buckling performance of hot-rolled steel plate |
| CN114472548A (en) * | 2020-10-23 | 2022-05-13 | 宝山钢铁股份有限公司 | System and method for reducing head-tail temperature difference in rolling process of super-long plate |
| CN114713639A (en) * | 2022-03-25 | 2022-07-08 | 北京科技大学设计研究院有限公司 | Shielding device control system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114472548A (en) * | 2020-10-23 | 2022-05-13 | 宝山钢铁股份有限公司 | System and method for reducing head-tail temperature difference in rolling process of super-long plate |
| CN114472548B (en) * | 2020-10-23 | 2024-06-04 | 宝山钢铁股份有限公司 | System and method for reducing head-tail temperature difference in ultra-long plate rolling process |
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| CN114713639A (en) * | 2022-03-25 | 2022-07-08 | 北京科技大学设计研究院有限公司 | Shielding device control system |
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