CN111850280A - Method for controlling deviation of wide material of continuous annealing unit - Google Patents
Method for controlling deviation of wide material of continuous annealing unit Download PDFInfo
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- CN111850280A CN111850280A CN202010649160.4A CN202010649160A CN111850280A CN 111850280 A CN111850280 A CN 111850280A CN 202010649160 A CN202010649160 A CN 202010649160A CN 111850280 A CN111850280 A CN 111850280A
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- steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention belongs to the technical field of steel rolling heat treatment, and particularly relates to a method for controlling deviation of a wide material of a continuous annealing unit. 1) Controlling the shape of the incoming material plate of the rolling mill; 2) controlling the convexity value and the wedge value of the hot-rolled strip steel; carrying out closed unloading or repairing removal on the steel coil with the convexity value of less than 40 mu m or the convexity value of more than 80 mu m and the wedge value of more than 50 mu m; 3) cutting off the serious defect part of the strip shape in the head and tail regions of the steel coil, and sealing the steel coil with poor strip shape; 4) controlling the deviation of a strip steel furnace area; when the temperature of the furnace area is reduced to below 700 ℃, the speed of the strip steel at the deviation position is controlled, so that the strip steel can creep out of the furnace at the speed of V being less than or equal to 30m/min, and the speed of the strip steel can be increased after the deviation amount of the strip steel is less than or equal to 50 mm. The invention reduces the risk of strip steel deviation and avoids the occurrence of strip breakage in the furnace.
Description
Technical Field
The invention belongs to the technical field of steel rolling heat treatment, and particularly relates to a method for controlling deviation of a wide material of a continuous annealing unit.
Background
The maximum process speed of the continuous annealing unit design can reach 450mpm, so that the stable and high-speed operation of the continuous annealing unit in the production process becomes a precondition for ensuring the high and stable yield of the continuous annealing unit.
The surface of the strip steel always has scratch defects during the production of wide plates with the width of 1600mm or more, the scratch defects cannot be eliminated, the material strip steel inlet loop and the furnace deviation are serious, the machine set frame and the furnace wall are scratched frequently, the machine set frame and the furnace wall are damaged repeatedly, the machine set frame and the furnace wall are stopped, the surface quality of products is influenced, and degraded products are caused.
Disclosure of Invention
The invention provides a method for controlling deviation of a continuous annealing unit wide material. By adopting the method, the strip steel deviation risk can be reduced, and the occurrence of strip breakage accidents in the furnace can be avoided.
In order to achieve the purpose, the invention adopts the following technical scheme:
1) controlling the shape of the incoming material plate of the rolling mill;
2) controlling the convexity value and the wedge value of the hot-rolled strip steel; carrying out closed unloading or repairing removal on the steel coil with the convexity value of less than 40 mu m or the convexity value of more than 80 mu m and the wedge value of more than 50 mu m;
3) cutting off the serious defect part of the strip shape in the head and tail regions of the steel coil, and sealing the steel coil with poor strip shape;
4) controlling the deviation of a strip steel furnace area; when the temperature of the furnace area is reduced to below 700 ℃, the speed of the strip steel at the deviation position is controlled, so that the strip steel can creep out of the furnace at the speed of V being less than or equal to 30m/min, and the speed of the strip steel can be increased after the deviation amount of the strip steel is less than or equal to 50 mm.
Compared with the prior art, the invention has the beneficial effects that:
The invention reduces the risk of strip steel deviation and avoids the occurrence of strip breakage in the furnace.
Drawings
FIG. 1 is a causal graph of the strip steel deviation influence factors of the invention.
Detailed Description
The following further illustrates embodiments of the invention, but is not intended to limit the scope of the invention.
Example (b):
the strip steel deviation influence factors are shown in figure 1, and the real reasons influencing 2130 strip steel deviation of the continuous annealing unit in the current stage are found out by analyzing and comparing the reasons in the aspects of human (operation), machine (furnace roller surface roughness measurement and abrasion), material (rolling mill incoming material plate shape and hot rolling raw material convexity and wedge exceeding standard), method (deviation control plan), ring and measurement (CPC detection precision) aiming at the continuous annealing strip steel deviation, and corresponding measures are adopted to solve the problem.
Adverse effects of plate shape: h99030120, DC04, 1.6mm multiplied by 1500mm, a continuous annealing unit 2019-09-1418: 51:28, wherein the strip steel is deflected to the OS side by 215mm at an inlet loop to scrape a loop frame, and the offset scraped part is cut off by stopping the team. According to the video record at that time, the H9903012 steel coil strip tail area wave shape is serious, so that the deviation of the inlet loop strip steel caused by the poor strip steel shape at the deviation blowing-out reason is analyzed. The influence of the out-of-specification convexity and wedge of the hot rolled material is shown in table 1.
TABLE 1 influence parameters of the crown and wedge of hot-rolled stock exceeding
When the two coils are continuously annealed, "the speed of a furnace area is 60m/min, the tension in the furnace is adjusted", but when the two coils are continuously annealed, "200 m of the tail of the steel coil strip deviates 117mm (the deviation position corresponds to the wedge-shaped non-fit position) to the OS side at the CPC8 and CPC 9", the edge of the strip steel has scraped the furnace wall, and the production risk is great.
A method for controlling deviation of a continuous annealing unit wide material specifically comprises the following steps:
1. controlling the shape of the incoming material of the rolling mill, strictly according to the target shape micro edge wave control, and completely eradicating the defect of the single-side wave shape;
2. controlling the 'convexity wedge value' of the hot rolled strip steel: checking and confirming a curve of a value of convexity and wedge of a material with an actual width of more than or equal to 1750mm roll by roll, and carrying out closed unloading or repair cutting on a steel coil with a convexity value of less than 40 mu m or a convexity value of more than 80 mu m and a wedge value of more than 50 mu m;
3. deviation treatment of a strip steel furnace area:
3.1, the furnace wall is scraped and touched by the edge of the strip steel in the furnace zone camera inspection under the condition of tension fluctuation:
when the furnace area deviates, such as the abnormal fluctuation of the strip steel tension in the deviation area or the contact of the edge of the strip steel with the furnace wall is observed through camera shooting, the furnace area needs to be stopped and cooled, when the temperature of the furnace area is reduced to below 700 ℃, the strip steel at the deviation position creeps at a low speed (V is less than or equal to 30m/min) to the outside of the furnace, the deviation condition is observed at the same time, and the furnace area can be accelerated after the deviation degree of the strip steel is reduced (the deviation amount of the strip steel is less than or equal to 50 mm).
3.2, the temperature of P2 is not more than 540 ℃ in the process of heating the ultra-low carbon steel, and the speed is allowed to be increased and decreased once every 5 minutes, wherein the maximum speed is 10m/min each time.
The invention reduces the risk of strip steel deviation and avoids the occurrence of strip breakage in the furnace.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (1)
1. A method for controlling deviation of a continuous annealing unit wide material is characterized by comprising the following steps:
1) controlling the shape of the incoming material plate of the rolling mill;
2) controlling the convexity value and the wedge value of the hot-rolled strip steel; carrying out closed unloading or repairing removal on the steel coil with the convexity value of less than 40 mu m or the convexity value of more than 80 mu m and the wedge value of more than 50 mu m;
3) cutting off the serious defect part of the strip shape in the head and tail regions of the steel coil, and sealing the steel coil with poor strip shape;
4) controlling the deviation of a strip steel furnace area; when the temperature of the furnace area is reduced to below 700 ℃, the speed of the strip steel at the deviation position is controlled, so that the strip steel can creep out of the furnace at the speed of V being less than or equal to 30m/min, and the speed of the strip steel can be increased after the deviation amount of the strip steel is less than or equal to 50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010649160.4A CN111850280A (en) | 2020-07-08 | 2020-07-08 | Method for controlling deviation of wide material of continuous annealing unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010649160.4A CN111850280A (en) | 2020-07-08 | 2020-07-08 | Method for controlling deviation of wide material of continuous annealing unit |
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| CN111850280A true CN111850280A (en) | 2020-10-30 |
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| CN202010649160.4A Pending CN111850280A (en) | 2020-07-08 | 2020-07-08 | Method for controlling deviation of wide material of continuous annealing unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853084A (en) * | 2021-01-08 | 2021-05-28 | 燕山大学 | Strip steel deviation rectifying device in continuous annealing furnace and method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5927117A (en) * | 1996-10-11 | 1999-07-27 | Central Iron & Steel Research Institute Ministry Metallurgical Industry | Methods to measure and control strip shape in rolling |
| CN105986116A (en) * | 2015-02-13 | 2016-10-05 | 鞍钢股份有限公司 | Method for controlling deviation of strip steel in continuous annealing furnace |
| CN106148674A (en) * | 2015-04-27 | 2016-11-23 | 宝钢不锈钢有限公司 | Continuous annealing unit bent and camber control tension adjustment as target with hot wooden dipper |
| CN110232232A (en) * | 2019-05-31 | 2019-09-13 | 宝钢湛江钢铁有限公司 | One kind being suitable for continuous annealing incoming profile aim curve optimal setting |
-
2020
- 2020-07-08 CN CN202010649160.4A patent/CN111850280A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5927117A (en) * | 1996-10-11 | 1999-07-27 | Central Iron & Steel Research Institute Ministry Metallurgical Industry | Methods to measure and control strip shape in rolling |
| CN105986116A (en) * | 2015-02-13 | 2016-10-05 | 鞍钢股份有限公司 | Method for controlling deviation of strip steel in continuous annealing furnace |
| CN106148674A (en) * | 2015-04-27 | 2016-11-23 | 宝钢不锈钢有限公司 | Continuous annealing unit bent and camber control tension adjustment as target with hot wooden dipper |
| CN110232232A (en) * | 2019-05-31 | 2019-09-13 | 宝钢湛江钢铁有限公司 | One kind being suitable for continuous annealing incoming profile aim curve optimal setting |
Non-Patent Citations (2)
| Title |
|---|
| 任新意等: "基于模式识别的超宽带钢初始板形与连退跑偏", 《钢铁》 * |
| 常旭等: "板形对连退机组跑偏的影响分析", 《钢铁研究学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853084A (en) * | 2021-01-08 | 2021-05-28 | 燕山大学 | Strip steel deviation rectifying device in continuous annealing furnace and method thereof |
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Application publication date: 20201030 |
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