CN113020282A - Production method for controlling plate shape of high-strength container plate - Google Patents
Production method for controlling plate shape of high-strength container plate Download PDFInfo
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- CN113020282A CN113020282A CN202110288500.XA CN202110288500A CN113020282A CN 113020282 A CN113020282 A CN 113020282A CN 202110288500 A CN202110288500 A CN 202110288500A CN 113020282 A CN113020282 A CN 113020282A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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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
- B21B37/48—Tension control; Compression control
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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
- B21B37/58—Roll-force control; Roll-gap control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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- Engineering & Computer Science (AREA)
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Abstract
The invention relates to a production method for controlling the shape of a high-strength container plate, which comprises the following steps: 1) controlling parameters of a rolling process; 2) controlling parameters of a laminar cooling process; 3) and controlling parameters of the splitting and flattening process. The invention controls and adjusts the technological parameters influencing the plate shape of the high-strength container plate in the production process, so that the plate shape of the strip steel after uncoiling and cutting is straight without warping, thereby meeting the use requirements of customers.
Description
Technical Field
The invention relates to the technical field of production of high-strength steel plates for containers, in particular to a production method for controlling the plate shape of a high-strength container plate.
Background
The high-strength container plate with the yield strength of more than 550Mpa has the thickness specification of 2.3-4.0 mm, is mainly used for manufacturing door plates, bottom plates and the like of containers, and has high plate shape control requirements. In the production process, due to the inherent large internal stress characteristic of the high-strength steel plate, when the strip steel is uncoiled into a flat plate with the length of 2.5m in use, a ship-shaped plate shape warping defect along the length direction exists, the subsequent welding process and the like are directly influenced, repeated straightening treatment is required, and even the strip steel cannot be used in serious cases.
Disclosure of Invention
The invention provides a production method for controlling the plate shape of a high-strength container plate, which controls and adjusts process parameters influencing the plate shape of the high-strength container plate in the production process, so that the plate shape after uncoiling and cutting of strip steel is straight without warping, thereby meeting the use requirements of customers.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method for controlling the shape of a high-strength container plate comprises the following steps:
1) controlling parameters of a rolling process; the target plate shape value of the high-strength container plates with different specifications is controlled as follows:
(1) when the thickness of the steel plate is more than 2.0mm and less than or equal to 3.0mm, the final frame rolling force is 7300-7700 kN, and the target flatness is 6I;
(2) when the thickness of the steel plate is more than 3.0mm and more than sigma and less than or equal to 4.0mm, the steel plate is divided into the following three conditions according to the width B of the steel plate:
when B is more than 800mm and less than or equal to 1100mm, the final frame rolling force is 7800-8200 kN, and the target flatness is 2I;
when B is more than 1100mm and less than or equal to 1200mm, the final frame rolling force is 8300-8700 kN, and the target flatness is 3I;
when B is larger than 1200mm and smaller than or equal to 1400mm, the final frame rolling force is 9300-9700 kN, and the target flatness is 5I;
(3) when the thickness of the steel plate is more than 4.0mm and less than or equal to 5.0mm, the final frame rolling force is 7800-8200 kN, and the target flatness is 2I;
2) controlling parameters of a laminar cooling process; the upper collecting pipe adopts an interval cooling mode, the lower collecting pipe adopts a continuous cooling mode, and the input amount ratio of the upper collecting pipe to the lower collecting pipe is 1: 1.8-2.2;
3) controlling parameters of a bundling and flattening process; the parameters of the coil splitting and flattening process with different specifications and group distances are as follows:
(1) the thickness of the steel plate is more than 2.0mm and less than or equal to 3.0mm, the leveling force is 4800-5200 kN, the roll bending force is 8-12 kN, the front tension is 160-170 kN, and the rear tension is 55-65 kN;
(2) when the thickness of the steel plate is more than 3.0mm and more than sigma and less than or equal to 4.0mm, the steel plate is divided into the following three conditions according to the width B of the steel plate:
when B is more than 800mm and less than or equal to 1100mm, the leveling force is 5800-6200 kN, the roll bending force is 17-23 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN;
when B is more than 1100mm and less than or equal to 1200mm, the leveling force is 6300-6700 kN, the roll bending force is 17-23 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN;
when B is larger than 1200mm and smaller than or equal to 1400mm, the leveling force is 6800-7200 kN, the roll bending force is 26-34 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN;
(3) when the thickness of the steel plate is more than 4.0mm and less than or equal to 5.0mm, the leveling force is 6300-6700 kN, the roll bending force is 8-12 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN.
And flattening the rolled steel plate by using a flattening machine, wherein the working roll of the flattening machine is made of high-chromium iron.
Compared with the prior art, the invention has the beneficial effects that:
the technological parameters influencing the plate shape of the high-strength container plate are controlled and adjusted in the production process, so that the plate shape of the strip steel after uncoiling and cutting is straight without warping, and the use requirements of customers are met.
Detailed Description
The invention relates to a production method for controlling the plate shape of a high-strength container plate, which comprises the following steps:
1) controlling parameters of a rolling process; the target plate shape value of the high-strength container plates with different specifications is controlled as follows:
(1) when the thickness of the steel plate is more than 2.0mm and less than or equal to 3.0mm, the final frame rolling force is 7300-7700 kN, and the target flatness is 6I;
(2) when the thickness of the steel plate is more than 3.0mm and more than sigma and less than or equal to 4.0mm, the steel plate is divided into the following three conditions according to the width B of the steel plate:
when B is more than 800mm and less than or equal to 1100mm, the final frame rolling force is 7800-8200 kN, and the target flatness is 2I;
when B is more than 1100mm and less than or equal to 1200mm, the final frame rolling force is 8300-8700 kN, and the target flatness is 3I;
when B is larger than 1200mm and smaller than or equal to 1400mm, the final frame rolling force is 9300-9700 kN, and the target flatness is 5I;
(3) when the thickness of the steel plate is more than 4.0mm and less than or equal to 5.0mm, the final frame rolling force is 7800-8200 kN, and the target flatness is 2I;
2) controlling parameters of a laminar cooling process; the upper collecting pipe adopts an interval cooling mode, the lower collecting pipe adopts a continuous cooling mode, and the input amount ratio of the upper collecting pipe to the lower collecting pipe is 1: 1.8-2.2;
3) controlling parameters of a bundling and flattening process; the parameters of the coil splitting and flattening process with different specifications and group distances are as follows:
(1) the thickness of the steel plate is more than 2.0mm and less than or equal to 3.0mm, the leveling force is 4800-5200 kN, the roll bending force is 8-12 kN, the front tension is 160-170 kN, and the rear tension is 55-65 kN;
(2) when the thickness of the steel plate is more than 3.0mm and more than sigma and less than or equal to 4.0mm, the steel plate is divided into the following three conditions according to the width B of the steel plate:
when B is more than 800mm and less than or equal to 1100mm, the leveling force is 5800-6200 kN, the roll bending force is 17-23 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN;
when B is more than 1100mm and less than or equal to 1200mm, the leveling force is 6300-6700 kN, the roll bending force is 17-23 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN;
when B is larger than 1200mm and smaller than or equal to 1400mm, the leveling force is 6800-7200 kN, the roll bending force is 26-34 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN;
(3) when the thickness of the steel plate is more than 4.0mm and less than or equal to 5.0mm, the leveling force is 6300-6700 kN, the roll bending force is 8-12 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN.
And flattening the rolled steel plate by using a flattening machine, wherein the working roll of the flattening machine is made of high-chromium iron.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In this example, a high-strength container board with an ac5504.0mm × 1280mm (thickness × width) specification is taken as an example; the method aims at solving the problems that the tissue evolution is easy to occur in the production process of the high-strength container plate, the temperature distribution is uneven in the rolling and cooling processes of the high-strength container plate, and the residual stress exists in the strip steel, namely the internal stress exists in the steel plate. By researching the relation among the wave shape of the finish rolling outlet, the wave shape of the cooling outlet and the wave shape of the finished product object, the influence factors of plate shape control and uneven temperature distribution and the leveling process parameters are analyzed, and a solution is provided.
The specific parameters are controlled as follows:
1. controlling technological parameters in the rolling process;
and optimizing the load of the finish rolling end frame and the target value of the plate shape, controlling the finish rolling outlet by adopting a micro-medium wave shape, and reducing the influence of the internal stress of the steel plate on the plate shape by controlling the target value of the wave shape of the outlet. Controlling the load of a final stand (F7 stand) to be 9500kN, and controlling the target value of the shape of a finish rolling outlet to be 5I;
2. controlling technological parameters in the laminar cooling process;
the upper collecting pipe adopts an interval cooling mode, the lower collecting pipe adopts a continuous cooling mode, and the input amount of the upper collecting pipe and the lower collecting pipe is controlled according to the proportion of 1: 2. The distribution of the internal stress of the strip steel is controlled by adjusting the cooling water amount of the laminar flow upper collecting pipe and the laminar flow lower collecting pipe.
3. Controlling technological parameters in the splitting and flattening process;
(1) the material of the working roll of the planisher is high-chromium iron.
(2) The flat rear plate shape does not allow the middle wave shape, the flat force is 7000kN, the roll bending force is 30kN, the front tension is 180MPa, and the rear tension is 80 MPa.
In the embodiment, the shape of the high-strength container plate is obviously improved, the reject ratio of the shape is reduced to below 5% from 31% before implementation, the problem that the high-strength container plate is warped up is solved, the use requirements of customers are met, and the cutting waste generated by warping up of the shape is avoided.
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 (2)
1. The production method for controlling the plate shape of the high-strength container plate is characterized by comprising the following steps of:
1) controlling parameters of a rolling process; the target plate shape value of the high-strength container plates with different specifications is controlled as follows:
(1) when the thickness of the steel plate is more than 2.0mm and less than or equal to 3.0mm, the final frame rolling force is 7300-7700 kN, and the target flatness is 6I;
(2) when the thickness of the steel plate is more than 3.0mm and more than sigma and less than or equal to 4.0mm, the steel plate is divided into the following three conditions according to the width B of the steel plate:
when B is more than 800mm and less than or equal to 1100mm, the final frame rolling force is 7800-8200 kN, and the target flatness is 2I;
when B is more than 1100mm and less than or equal to 1200mm, the final frame rolling force is 8300-8700 kN, and the target flatness is 3I;
when B is larger than 1200mm and smaller than or equal to 1400mm, the final frame rolling force is 9300-9700 kN, and the target flatness is 5I;
(3) when the thickness of the steel plate is more than 4.0mm and less than or equal to 5.0mm, the final frame rolling force is 7800-8200 kN, and the target flatness is 2I;
2) controlling parameters of a laminar cooling process; the upper collecting pipe adopts an interval cooling mode, the lower collecting pipe adopts a continuous cooling mode, and the input amount ratio of the upper collecting pipe to the lower collecting pipe is 1: 1.8-2.2;
3) controlling parameters of a bundling and flattening process; the parameters of the coil splitting and flattening process with different specifications and group distances are as follows:
(1) the thickness of the steel plate is more than 2.0mm and less than or equal to 3.0mm, the leveling force is 4800-5200 kN, the roll bending force is 8-12 kN, the front tension is 160-170 kN, and the rear tension is 55-65 kN;
(2) when the thickness of the steel plate is more than 3.0mm and more than sigma and less than or equal to 4.0mm, the steel plate is divided into the following three conditions according to the width B of the steel plate:
when B is more than 800mm and less than or equal to 1100mm, the leveling force is 5800-6200 kN, the roll bending force is 17-23 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN;
when B is more than 1100mm and less than or equal to 1200mm, the leveling force is 6300-6700 kN, the roll bending force is 17-23 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN;
when B is larger than 1200mm and smaller than or equal to 1400mm, the leveling force is 6800-7200 kN, the roll bending force is 26-34 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN;
(3) when the thickness of the steel plate is more than 4.0mm and less than or equal to 5.0mm, the leveling force is 6300-6700 kN, the roll bending force is 8-12 kN, the front tension is 180-190 kN, and the rear tension is 76-84 kN.
2. The production method for controlling the plate shape of the high-strength container plate as claimed in claim 1, wherein a planishing mill is used for planishing the rolled steel plate, and the planishing mill working roll is made of high-chromium iron.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110288500.XA CN113020282B (en) | 2021-03-18 | 2021-03-18 | Production method for controlling plate shape of high-strength container |
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| CN202110288500.XA CN113020282B (en) | 2021-03-18 | 2021-03-18 | Production method for controlling plate shape of high-strength container |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113857264A (en) * | 2021-09-27 | 2021-12-31 | 日照宝华新材料有限公司 | SPA-H hot-rolled coil shape control method |
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2021
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Cited By (1)
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