CN112792141B - Production method for successfully rolling extreme-size pipeline steel - Google Patents
Production method for successfully rolling extreme-size pipeline steel Download PDFInfo
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- CN112792141B CN112792141B CN202011511937.7A CN202011511937A CN112792141B CN 112792141 B CN112792141 B CN 112792141B CN 202011511937 A CN202011511937 A CN 202011511937A CN 112792141 B CN112792141 B CN 112792141B
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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
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/02—Shape or construction of rolls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
- B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product
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Abstract
The invention discloses a production method for successfully rolling extreme-size pipeline steel, which relates to the field of metallurgical industry and comprises the following specific steps: step (1): firstly, blank with the cross section of 220 mm is used for cogging, the blank is finished according to the size requirement, then the blank is pulled back to a plate blank library for rolling, the cogging size is 120 x 1665 x 3000mm, and plates are assembled by three-time scales; step (2): and (3) rolling by adopting the small-roll-diameter negative-convexity, adjusting the roll shape of the rough rolling working roll to-0.05 mm by using a flat roll, adjusting the roll shape of the finish rolling working roll to-0.1 mm by using the flat roll, and ensuring that the roll diameter of the working roll is 980-plus-1000 mm. The roll steel passing amount before production is in the aspect of size control over 500 large plates, parameter compensation is carried out according to the tolerance upper limit, the average thickness is controlled to be about 8.8 mm, the roll gap difference of two sides is dynamically adjusted in the rolling process, the rolled plate shape is straight, normal shearing of finishing can be guaranteed, the control of the last rolling force is realized by setting the torque of the corresponding finishing rolling stage aiming at the steel plates with different grades and widths, and the generation of the rolling camber is effectively controlled.
Description
Technical Field
The invention relates to the field of metallurgical industry, in particular to a production method for successfully rolling extreme-size pipeline steel.
Background
The dimension of a product generally produced by the 3500 mm middle plate production line in the wide and thick plate workshop is as follows: the thickness is 10-100mm, the width is 2000-3000mm, the length is 2000-40000mm, the longer, thinner and narrower production specifications are, the more difficult the plate type is to control, the long and narrow plates can cause damage to equipment caused by a sickle-shaped scraping frame, and the difficult problem of the production of the middle plate is that a batch of pipeline steel with the size of 8.6-1650 40000mm is produced in a workshop according to the requirements of customers.
The length, the width and the thickness of the large plate with the specification are all limit specifications, the production difficulty is extremely high, the main problems are that the thickness is thin, the width is small, in addition, the length of the large plate is too long, the camber of a steel plate in the last two-pass rolling process is extremely difficult to control, a frame is easily scraped to damage equipment, and the production stop is caused in severe cases.
Disclosure of Invention
The invention aims to: in order to solve the problem that camber is difficult to control during rolling, a production method for successfully rolling the pipeline steel with the ultimate size is provided.
In order to achieve the purpose, the invention provides the following technical scheme: a production method for successfully rolling 8.6 x 1500 x 41000 mm ultimate dimension pipeline steel comprises the following specific steps:
a production method for successfully rolling pipeline steel with ultimate dimension comprises the following specific steps:
step (1): firstly, blank with the cross section of 220 mm is used for cogging, the blank is finished according to the size requirement, then the blank is pulled back to a plate blank library for rolling, the cogging size is 120 x 1665 x 3000mm, and plates are assembled by three-time scales;
step (2): rolling by adopting a small-roll-diameter negative-convexity mode, adjusting the roll shape of a rough rolling working roll to-0.05 mm by a flat roll, adjusting the roll shape of a finish rolling working roll to-0.1 mm by the flat roll, and ensuring that the roll diameter of the working roll is 980-1000 mm;
and (3): before rolling the pipeline steel, setting reasonable rolling parameters, setting the middle thickness to be heated to 75mm, measuring the middle thickness to be larger than the two sides by 0.1-0.2 mm by a thickness meter, and controlling the final rolling temperature to be 900-grade 910 ℃;
and (4): when planning production scheduling, arranging rolling at the last stage of a roll service, wherein the steel passing amount of a roll before production is more than 500 large plates;
and (5): in the aspect of dimension control, parameter compensation is carried out according to the upper limit of tolerance, so that the thickness of the rolled large plate is not less than 8.8 mm;
and (6): in the rolling process, personnel are arranged for on-site monitoring and plate shape feedback, and an operator properly adjusts the roll gap difference on two sides according to the on-site condition, so that the rolled plate shape is straight and the normal shearing of finishing can be ensured.
Preferably, the rough rolling of the plate blank in the step (2) adopts 5-pass rolling, and the deformation of each pass is 15%.
Preferably, the deformation of the plate blank in the last-but-one pass of finish rolling in the step (2) is more than 20%, the deformation of a non-recrystallization region is ensured, a phase transformation nucleation core is increased, and ferrite grains are refined.
Preferably, the last rolling force in the step (3) is controlled at 3500-4000 tons.
Preferably, the thickness compensation amount is increased by 0.15 to 0.25 mm in the step (5).
Compared with the prior art, the invention has the beneficial effects that: the invention adopts the rolling with the small roll diameter and the negative convexity, the roll shape of the rough rolling working roll is adjusted to-0.05 mm by the flat roll, the roll shape of the finish rolling working roll is adjusted to-0.1 mm by the flat roll, the slope parameter is reasonably adjusted according to the rolled plate shape, the last rolling force is ensured to be 3500 plus 4000 tons, the middle thickness measured by a thickness gauge is 0.1-0.2 mm larger than two sides, the rolling is arranged at the last stage of one roll service during planned production, the steel passing amount of the roll before production is more than 500 big plates, the parameter compensation is carried out according to the upper limit of tolerance, the average thickness is controlled to be about 8.8 mm, the gap difference between the two sides of the roll is dynamically adjusted in the rolling process, the rolled plate shape is flat and straight, the normal shearing of finishing can be ensured, the control of the last rolling force is realized by setting the torque of the corresponding stage aiming at the steel plates with different levels and widths, the production of the sickle can be effectively controlled, the method is widely applied to rolling of 4100mm wide and thick plates at present, and has an obvious effect.
Drawings
FIG. 1 is a schematic view of the rolling schedule of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art. The following describes an embodiment of the present invention based on its overall structure.
Referring to fig. 1, a method for successfully rolling a steel for a pipeline with a limited dimension includes the following steps:
a production method for successfully rolling pipeline steel with extreme size comprises the following specific steps:
step (1): firstly, blank with the cross section of 220 mm is used for cogging, the blank is finished according to the size requirement, then the blank is pulled back to a plate blank library for rolling, the cogging size is 120 x 1665 x 3000mm, and plates are assembled by three-time scales;
step (2): rolling by adopting a small-roll-diameter negative-convexity mode, adjusting the roll shape of a rough rolling working roll to-0.05 mm by a flat roll, adjusting the roll shape of a finish rolling working roll to-0.1 mm by the flat roll, and ensuring that the roll diameter of the working roll is 980-1000 mm;
and (3): before rolling the pipeline steel, setting reasonable rolling parameters, setting the middle thickness to be heated to 75mm, measuring the middle thickness to be larger than the two sides by 0.1-0.2 mm by a thickness meter, and controlling the final rolling temperature to be 900-grade 910 ℃;
and (4): when planning production scheduling, arranging rolling at the last stage of a roll service, wherein the steel passing amount of a roll before production is more than 500 large plates;
and (5): in the aspect of dimension control, parameter compensation is carried out according to the upper limit of tolerance, so that the thickness of the rolled large plate is not less than 8.8 mm;
and (6): in the rolling process, personnel are arranged to monitor and feed back the plate shape condition on site, and an operator properly adjusts the roll gap difference on two sides according to the site condition so that the rolled plate shape is straight and the finishing can be cut normally.
In the invention, the rough rolling of the plate blank in the step (2) adopts 5-pass rolling, and the deformation of each pass is 15%.
In the invention, the deformation of the plate blank in the last third pass of finish rolling in the step (2) is more than 20 percent, the deformation of a non-recrystallization area is ensured, a phase-change nucleation core is increased, and ferrite grains are refined.
In the invention, the last rolling force in the step (3) is controlled at 3500-4000 tons.
In the invention, the thickness compensation quantity is increased by 0.15-0.25 mm in the step (5).
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. A production method for successfully rolling pipeline steel with ultimate dimension comprises the following specific steps:
step (1): firstly, blank with the cross section of 220 mm is used for cogging, the blank is finished according to the size requirement, then the blank is pulled back to a plate blank library for rolling, the cogging size is 120 x 1665 x 3000mm, and plates are assembled by three-time scales;
step (2): rolling by adopting a small-roll-diameter negative-convexity mode, adjusting the roll shape of a rough rolling working roll to-0.05 mm by a flat roll, adjusting the roll shape of a finish rolling working roll to-0.1 mm by the flat roll, and ensuring that the roll diameter of the working roll is 980-1000 mm;
and (3): before rolling the pipeline steel, setting reasonable rolling parameters, setting the middle thickness to be heated to 75mm, measuring the middle thickness to be larger than the two sides by 0.1-0.2 mm by a thickness meter, and controlling the final rolling temperature to be 900 plus 910 ℃;
and (4): when planning production scheduling, arranging rolling at the last stage of a roll service, wherein the steel passing amount of a roll before production is more than 500 large plates;
and (5): in the aspect of dimension control, parameter compensation is carried out according to the upper limit of tolerance, so that the thickness of the rolled large plate is not less than 8.8 mm;
and (6): in the rolling process, personnel are arranged to monitor and feed back the plate shape condition on site, and an operator properly adjusts the roll gap difference on two sides according to the site condition so that the rolled plate shape is straight and the finishing can be cut normally.
2. A method of producing a successfully rolled steel for extreme pipeline sizes according to claim 1, characterized in that: and (3) the rough rolling of the plate blank in the step (2) adopts 5-pass rolling, and the deformation of each pass is 15%.
3. A method of producing a successfully rolled steel for extreme pipeline sizes according to claim 1, characterized in that: and (3) in the step (2), the deformation of the plate blank in the last third pass of finish rolling is more than 20%, the deformation of a non-recrystallization area is ensured, a phase change nucleation core is increased, and ferrite grains are refined.
4. A method of producing a successfully rolled steel for extreme pipeline sizes according to claim 1, characterized in that: and (4) controlling the last rolling force in the step (3) at 3500-4000 tons.
5. A method of producing a successfully rolled steel for extreme pipeline sizes according to claim 1, characterized in that: and (5) increasing the thickness compensation quantity to be 0.15-0.25 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011511937.7A CN112792141B (en) | 2020-12-18 | 2020-12-18 | Production method for successfully rolling extreme-size pipeline steel |
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| CN202011511937.7A CN112792141B (en) | 2020-12-18 | 2020-12-18 | Production method for successfully rolling extreme-size pipeline steel |
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| CN112792141B true CN112792141B (en) | 2022-06-21 |
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| CN101554635B (en) * | 2009-05-18 | 2011-01-26 | 首钢总公司 | Method for configuring shape of supporting roll of four-high mill and shape of working roll thereof |
| CN101985129B (en) * | 2010-09-08 | 2012-05-09 | 湖南华菱湘潭钢铁有限公司 | Rolling method for negative common difference steel plate |
| CN102744260B (en) * | 2012-07-09 | 2014-05-28 | 首钢总公司 | Working roller considering both convexity and edge drop control of strip steel and design method for roller shape of working roller |
| CN105665443B (en) * | 2016-03-30 | 2018-01-23 | 首钢总公司 | A kind of rolling mill practice of wide and heavy plate mill production Limit specifications pipe line steel |
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