CN112246881B - X70 thin and wide plate shape control method suitable for ultra-fast cooling - Google Patents
X70 thin and wide plate shape control method suitable for ultra-fast cooling Download PDFInfo
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- CN112246881B CN112246881B CN202011048409.2A CN202011048409A CN112246881B CN 112246881 B CN112246881 B CN 112246881B CN 202011048409 A CN202011048409 A CN 202011048409A CN 112246881 B CN112246881 B CN 112246881B
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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
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
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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
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a method for controlling the shape of an X70 thin and wide plate suitable for ultra-fast cooling, which comprises a pre-straightening step, a water cooling step, a red returning step and a hot straightening step. Aiming at the problem of serious plate buckling of the high-strength, thin and wide pipeline steel X70, the invention adopts general equipment such as a 5000mm strong wide and thick plate rolling mill, a pre-straightening machine, ultra-fast cooling ADCOS-PM, a hot straightening machine and the like, and can stably produce the thin, ultra-wide and high-strength pipeline steel X70 by comprehensively matching refined rolling parameters, special water cooling modes and water cooling and hot straightening parameters. The problems of buckling, water outlet buckling, water trapping and the like in the water cooling process of the X70 steel plate are solved, the problem that the water cooling buckling cannot be straightened is avoided, meanwhile, the cold bed plate shape is guaranteed not to deform, and the purpose of flattening the X70 steel plate shape is finally achieved. The invention also has the advantages of high cooling speed, uniform temperature, flat plate shape, high production efficiency and uniform plate performance.
Description
Technical Field
The invention belongs to the technical field of metallurgical manufacturing, and particularly relates to a method for controlling the shape of an X70 thin and wide plate suitable for ultra-fast cooling.
Background
In recent years, with the extension of gas and oil pipelines and the improvement of required pressure at home and abroad, X70 becomes mainstream high-strength pipeline steel. Because the high-strength pipeline steel adopts the process route of low finish rolling temperature and low water cooling temperature, the high-strength pipeline steel has large deformation resistance, extremely high requirement on water cooling uniformity and large plate shape control difficulty.
With the increase of customer demand and the expansion of the diameter of gas and oil pipelines, the width of steel for pipelines is gradually widened. The high-strength ultra-wide pipeline steel is a product of development and integration of modern metallurgical technology, material technology and manufacturing technology, and development of the high-strength ultra-wide pipeline steel marks the pipeline steel to enter a new era.
However, the high-strength pipeline steel also means that the difficulty of plate shape control increases in a geometric exponential manner while the width is widened. Particularly, for thin and wide plates with the thickness not more than 20 and the width between 4000 and 5000, the plate shape on a cooling bed is affected by stress due to factors such as poor plate shape control, uneven water cooling temperature, residual water on the surface and the like, the secondary deformation and buckling are serious, and the normal production flow and the product quality are seriously affected.
Therefore, how to control the water cooling uniformity, whether residual water exists on the surface of the steel plate, prevent buckling deformation again, achieve qualified plate shape, and normally perform line shearing production still needs to be deeply researched.
Disclosure of Invention
The invention aims to provide a method for controlling the shape of an X70 thin and wide plate suitable for ultra-fast cooling, which aims to solve the problems in the prior art.
The invention is realized by the following technical scheme: a method for controlling the shape of an X70 thin and wide plate suitable for ultrafast cooling is characterized by comprising the following steps: the method comprises the following steps:
step 1, pre-straightening: putting the rolled plate into a pre-straightening machine, and lifting the pre-straightening force to 3500 to 4000kN for pre-straightening;
step 2, water cooling: cooling by an ultra-fast cooling system; wherein
1) A water cooling mode: 5kg and DQ mode are adopted;
2) A nozzle: a gap nozzle and a high-density nozzle are combined;
3) Water group: adopting 2 to 4 groups of slit nozzles and 5 to 12 or 13 groups of high-density nozzles;
4) Flow rate: carrying out high-density cultivation on each group of gap with the upper jet flow rate of 290 m/h and carrying out high-density cultivation on each group of gap with the upper middle cavity flow rate of 135 m/h;
5) Water ratio: the ratio of the gap to the high-density water is 1.6 to 1.7;
6) Side cavity: the coefficient of the high-density side cavity is 0.35;
7) Ultra-fast cooling roll speed: the roll speed was set at 0.8m/;
8) Ultra-fast cold acceleration: setting the acceleration to be 0.012-0.015;
9) Horizontal spraying, side spraying and purging: the horizontal spraying uses the 3 rd group and the 5 th group, the side spraying uses the 1 st group, the 3 rd group, the 4 th group, the 5 th group and the 6 th group, and the purging uses the 2 nd group and the 3 rd group;
10 Head-to-tail shading: the upper distance of the head is 300mm, the flow coefficient is 0.4, the lower distance is 150mm, and the flow coefficient is 0.47; the tail part has the upper distance of 1000mm and the flow coefficient of 0.68, and the lower distance of 600mm and the flow coefficient of 0.75; head shielding time coefficient, 2.1s;
step 3, a reddening step; the time of red return is 30 to 40s;
step 4, straightening by a hot straightening machine; the small tilting is adopted, and the thermal straightening and straightening force are 12000kN for 2 times.
Further: in the step 4, the tilting value of the small tilting is 1.8.
And further: in the finish rolling section, the steel plate adopts the change of the equal proportion convexity in the last three times, the rolling force is linearly reduced, and the small roll bending force is 1500-3000kN, so that the original plate shape is flat or slightly middle-wave.
Further: and a production scheduling step is also included before the pre-straightening step, and the production scheduling step is within 1500 t.
The invention has the advantages that: the invention provides an X70 thin and wide plate shape control method suitable for ultra-fast cooling aiming at the problem of serious buckling of a high-strength, thin and wide pipeline steel X70 plate shape, and the method can stably produce the thin, ultra-wide and high-strength pipeline steel X70 by adopting general equipment such as a 5000mm strong wide and thick plate rolling mill, a pre-straightening machine, ultra-fast cooling ADCOS-PM, a hot straightening machine and the like and comprehensively matching the researched special water cooling mode, water cooling and hot straightening parameters through refined rolling parameters. The invention solves the series problems of buckling, water outlet buckling, water trapping and the like in the water cooling process of the X70 steel plate, avoids the problem that the water cooling buckling cannot be straightened, simultaneously ensures that the shape of the cooling bed is not deformed any more, and finally realizes the purpose of flattening the shape of the X70 steel plate. Meanwhile, the method has the advantages of large cooling speed, uniform water cooling temperature, flat plate shape, capability of realizing online flaw detection, high production efficiency and uniform performance of the whole plate.
Detailed Description
The invention discloses a method for controlling the shape of an X70 thin and wide plate suitable for ultrafast cooling, which comprises the following steps:
step 1, pre-straightening: putting the rolled plate into a pre-straightening machine, and lifting the pre-straightening force to 3500 to 4000kN for pre-straightening;
step 2, water cooling: cooling by an ultra-fast cooling system; wherein
1) A water cooling mode: 5kg and DQ mode are adopted;
2) A nozzle: a gap nozzle and a high-density nozzle are combined;
3) Water group: adopting 2 to 4 groups of gap nozzles and 5 to 12 or 13 groups of high-density nozzles;
4) Flow rate: carrying out high-density cultivation on each group of gap with the upper jet flow rate of 290 m/h and carrying out high-density cultivation on each group of gap with the upper middle cavity flow rate of 135 m/h;
5) Water ratio: the ratio of the gap to the high-density water is 1.6 to 1.7;
6) Side cavity: the coefficient of the high-density side cavity is 0.35;
7) Ultra-fast cooling roll speed: the roll speed was set at 0.8m/;
8) Ultra-fast cold-heating speed: setting the acceleration to be 0.012 to 0.015;
9) Horizontal spraying, side spraying and purging: the 3 rd group and the 5 th group are used for horizontal spraying, the 1 st group, the 3 rd group, the 4 th group, the 5 th group and the 6 th group are used for side spraying, and the 2 nd group and the 3 rd group are used for purging;
10 Head-to-tail shading: the upper distance of the head is 300mm, the flow coefficient is 0.4, the lower distance is 150mm, and the flow coefficient is 0.47; the tail part has the upper distance of 1000mm and the flow coefficient of 0.68, and the lower distance of 600mm and the flow coefficient of 0.75; head shielding time coefficient, 2.1s;
step 3, a red returning step; the time of red return is 30 to 40s;
step 4, straightening by a hot straightening machine; the small tilting is adopted, and the thermal straightening and straightening force are 12000kN for 2 times.
Preferably: in the step 4, the tilt value of the small tilt is 1.7 to 1.9, and more preferably 1.8.
Preferably: in the finish rolling section, the steel plate adopts the change of the equal proportion convexity in the last three times, the rolling force is linearly reduced, and the small roll bending force is 1500-3000kN, so that the original plate shape is flat or slightly middle-wave.
Preferably: and a production scheduling step is also included before the pre-straightening step, and the production scheduling step is within 1500 t.
Preferably: the ultra-fast cooling system is an ADCOS-PM type post-rolling cooling system of the university of northeast China. And the other devices are all universal devices.
The invention provides an X70 thin and wide plate shape control method suitable for ultra-fast cooling aiming at the problem of serious buckling of a high-strength, thin and wide pipeline steel X70 plate shape, and the method can stably produce the thin, ultra-wide and high-strength pipeline steel X70 by adopting general equipment such as a 5000mm strong wide and thick plate rolling mill, a pre-straightening machine, ultra-fast cooling ADCOS-PM, a hot straightening machine and the like and comprehensively matching the researched special water cooling mode, water cooling and hot straightening parameters through refined rolling parameters. The invention solves the series problems of buckling, water outlet buckling, water trapping and the like in the water cooling process of the X70 steel plate, avoids the problem that the water cooling buckling cannot be straightened, simultaneously ensures that the shape of the cooling bed is not deformed any more, and finally realizes the purpose of flattening the shape of the X70 steel plate.
Example 1
According to the X70 thin and wide plate shape control method suitable for ultra-fast cooling, stable production of thin and wide specification high-strength pipeline steel X70 is completed. Plate specification: 19.7/19.8 x 4374 x 12100mm, 10707 tons of monthly output, and 100% of plate shape pass rate.
The method comprises the following specific steps: the steel excess is 780 tons; the finishing temperature is 824 ℃; the final cooling temperature is 519 ℃; the rolling force of the last three rolling passes of the reduction schedule is linearly reduced; putting a pre-straightening machine at 3500 kN to 4000kN; water cooling is carried out by adopting a 5kg and DQ mode; carrying out gap nozzle 3 groups and carrying out flow rate 290 m/h; carrying out high-density nozzle 9 groups, carrying out flow rate 135 m/h and carrying out side cavity 0.35; the water ratio is 1.6; the roller speed is 0.8m/s; acceleration 0.012; opening the 1 st, 3 rd, 4 th, 5 th and 6 th groups by side spraying; opening groups 3 and 5 by horizontal spraying; purging to close the 1 st group and open the 2 nd and 3 rd groups; the head is shielded, the upper distance is 300mm, the flow coefficient is 0.4, the lower distance is 150mm, and the flow coefficient is 0.47; the tail part is shielded, the upper distance is 1000mm, the flow coefficient is 0.68, the lower distance is 600mm, and the flow coefficient is 0.75; head shielding time 2.1s; the forward re-reddening of the hot straightener is 30 to 40s, the hot straightening is tilted by 1.8, and the hot straightening force is 12000kN.
In the embodiment, tests show that the method has the advantages of high cooling speed (23-27 ℃/s), uniform water cooling temperature (20-30 ℃ of head-tail temperature difference), flat plate shape (no wave between the plate shape after water cooling and a cooling bed), capability of realizing online flaw detection, high production efficiency (17-19 blocks/h), uniform plate performance (20-50 MPa of head-to-tail performance difference) and the like.
In the scheme, the selection principle of parameters in each step is as follows:
firstly, scheduling production; the production scheduling of the ultra-wide specification roller type is very important. The excessive steel amount of the wide-specification steel plate is excessive, the abrasion loss in the middle of the working roll is larger than that of the edge part, and the wave shape is generated, so that the early-stage production of the working roll is required to be within 1500 t;
secondly, finish rolling; thirdly, the rolling force is linearly reduced by adopting the change of the equal proportion convexity, and the original flatness or slight middle wave is achieved by adopting the small roll bending force of 1500-3000kN;
thirdly, a pre-straightening machine; putting a pre-straightening machine, and increasing the pre-straightening force to 3500 to 4000kN, so as to ensure the flatness of the water inlet plate and improve the water cooling uniformity;
fourthly, water cooling of the thin and wide plates:
1) A water cooling mode; the 5kg, DQ mode was used. Super-strong high-pressure water cooling is adopted, so that the water cooling uniformity is improved;
2) A nozzle; adopting a slit nozzle and a high-density nozzle; only a slit nozzle is used, the influence of a cooling area is realized, and the final cooling temperature cannot reach a target value; only a high-density nozzle is used, so that the cooling capacity is insufficient and the temperature is uneven; under the 5kg and DQ modes, the high-pressure large-flow large-cooling-speed slit nozzle ensures that the upper and lower water cooling temperatures of the water-entering steel plate are uniform; the small flow of the gap nozzle achieves the purpose of controlling the plate shape and the final cooling temperature;
3) A water group; adopting 2-4 groups of slit nozzles and 5-12/13 groups of high-density nozzles; the gap 1 group and the high-density 14 group are crossed with side spraying, transverse spraying and blowing, if the device is put into use, residual water on the plate surface cannot be thoroughly removed, water cooling is uneven, and the plate shape is buckled; therefore, when selecting the water group, the water group should be avoided from side spraying, transverse spraying and purging to avoid mutual interference;
4) Flow rate; carrying out high-density cultivation on each group of gap with the upper jet flow rate of 290 m/h and carrying out high-density cultivation on each group of gap with the upper middle cavity flow rate of 135 m/h; the water cooling uniformity is improved by adopting a mode of strong cooling, weak cooling and flow decrement, and the residual water on the board surface is favorably removed;
5) Water ratio; the ratio of the gap to the high-density water is 1.6 to 1.7; the problem of uneven water cooling of the upper surface and the lower surface of the steel plate is solved;
6) A side cavity; the coefficient of the high-density side cavity is 0.35; the problem of local supercooling of the edge part is solved, and the transverse water cooling uniformity of the ultrafast steel plate is improved;
7) Ultra-fast cold roll speed; setting the roller speed to be 0.8m/s; the speed is consistent with the straightening speed of the pre-straightening machine at the beginning, so that tracking errors caused by factors of acceleration and deceleration of a steel plate and abrasion of a roller way are avoided;
8) Ultra-fast cold acceleration; setting the acceleration to be 0.012-0.015; because the head and tail water inlet temperature of the steel plate has deviation, reasonable acceleration is matched in the water cooling process, the problem of head and tail temperature difference of the steel plate is solved, and the water cooling uniformity is improved;
9) Horizontal spraying, side spraying and purging; the 3 rd group and the 5 th group are used for horizontal spraying, the 1 st group, the 3 rd group, the 4 th group, the 5 th group and the 6 th group are used for side spraying, and the 2 nd group and the 3 rd group are used for purging; firstly, forming a section A water sealing group, namely an area when the steel plate is discharged from a water cooling area, by a transverse spraying group 3, a side spraying group 4, a side spraying group 5 and a side spraying group 6 and a purging group 2; secondly, closing the purging 1 group, aiming at solving the problem of water storage on the surface of the steel plate, wherein the current ultra-fast cold clear water capacity is smaller than the high-strength ultra-wide X70 surface input flow, closing the purging 1 group, changing the blocking mode into the dredging mode, and enabling the redundant residual water to flow out from the tail part of the steel plate so as to reduce the pressure of the upper surface cleaning residual water; thirdly, side spraying the group 1 to increase the clear water capacity when the residual water flows out of the tail part of the steel plate in the water cooling process of the steel plate; finally, a water sealing group of the ultra-fast cooling equipment is formed by a transverse spraying group 5 and a purging group 3, and all residual water on the steel plate is removed finally to achieve the purpose of no residual water on the surface;
10 Head and tail shielding; the upper distance of the head is 300mm, the flow coefficient is 0.4, the lower distance is 150mm, and the flow coefficient is 0.47; the tail part has the upper distance of 1000mm and the flow coefficient of 0.68, and the lower distance of 600mm and the flow coefficient of 0.75; head shielding time coefficient, 2.1s; the problems that the head and the tail are locally supercooled and buckled, and the water outlet head is seriously upwarped and cannot be straightened are solved; the effect of phase change in the cooling process is mainly considered; the pipeline steel is finally cooled to 520 ℃, and the volume change in the steel plate structure is martensite volume > bainite volume > pearlite volume; in order to improve the plate shape, the head of the steel plate is buckled downwards, the phase change of the upper surface is faster than that of the lower surface, and the flow coefficient of the lower surface is properly increased; when the head of the steel plate is upwarped, the lower surface flow coefficient can be properly reduced;
fifthly, red returning; carrying out rewarding for 30 to 40s before thermal correction, so that a local supercooled area of the board surface has sufficient time for rewarding, the temperature of the board surface is uniform, and internal stress is preliminarily eliminated;
sixthly, a hot straightener; the strategy of small tilting (1.8) is adopted, the initial warping degree is reduced, reasonable plastic deformation is matched, and the internal stress is eliminated to the maximum extent by adopting 2 times of thermal straightening and a straightening force 12000 kN; finally, the purposes of minimum residual curvature and best plate shape of the steel plate are achieved.
Claims (4)
1. A method for controlling the shape of an X70 thin and wide plate suitable for ultra-fast cooling is characterized by comprising the following steps: the method comprises the following steps:
step 1, pre-straightening: putting the rolled plate into a pre-straightening machine, and lifting the pre-straightening force to 3500 to 4000kN for pre-straightening;
step 2, water cooling step: cooling by an ultra-fast cooling system; wherein
1) A water cooling mode: 5kg and DQ mode are adopted;
2) A nozzle: a gap nozzle and a high-density nozzle are combined;
3) Water group: adopting 2 to 4 groups of slit nozzles and 5 to 12 or 13 groups of high-density nozzles;
4) Flow rate: carrying out high-density cultivation on each group of gap with the upper jet flow rate of 290 m/h and carrying out high-density cultivation on each group of gap with the upper middle cavity flow rate of 135 m/h;
5) Water ratio: the ratio of the gap to the high-density water is 1.6 to 1.7;
6) Side cavity: the coefficient of the high-density side cavity is 0.35;
7) Ultra-fast cooling roll speed: the roll speed was set at 0.8m/;
8) Ultra-fast cold-heating speed: setting the acceleration to be 0.012-0.015;
9) Horizontal spraying, side spraying and purging: the horizontal spraying uses the 3 rd group and the 5 th group, the side spraying uses the 1 st group, the 3 rd group, the 4 th group, the 5 th group and the 6 th group, and the purging uses the 2 nd group and the 3 rd group;
10 Head-to-tail shading: the upper distance of the head is 300mm, the flow coefficient is 0.4, the lower distance is 150mm, and the flow coefficient is 0.47; the tail part has the upper distance of 1000mm and the flow coefficient of 0.68, and the lower distance of 600mm and the flow coefficient of 0.75; head shielding time coefficient, 2.1s;
step 3, a red returning step; the time of red return is 30 to 40s;
step 4, straightening by a hot straightening machine; the small tilting is adopted, and the thermal straightening and straightening force are 12000kN for 2 times.
2. The method for controlling the shape of the X70 thin wide plate suitable for ultra-fast cooling according to claim 1, wherein: in the step 4, the tilting of the small tilting is 1.8.
3. The method for controlling the shape of the X70 thin wide plate suitable for ultra-fast cooling according to claim 1, wherein: in the finish rolling section, the steel plate adopts the change of the equal proportion convexity in the last three times, the rolling force is linearly reduced, and the small roll bending force is 1500-3000kN, so that the original plate shape is flat or slightly middle-wave.
4. The method for controlling the shape of the X70 thin wide plate suitable for ultra-fast cooling according to claim 1, wherein: and a production scheduling step is also included before the pre-straightening step, and the production scheduling step is within 1500 t.
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| CN113005369B (en) * | 2021-02-26 | 2022-05-27 | 日钢营口中板有限公司 | Method for producing ultra-wide low-temperature X70M pipeline steel plate by adopting large spreading ratio mode |
| CN113732083B (en) * | 2021-08-31 | 2023-12-01 | 日钢营口中板有限公司 | Ultra-fast cooling method for improving buckling performance of hot rolled steel plate |
| CN114178414B (en) * | 2021-11-16 | 2023-07-04 | 山东钢铁集团日照有限公司 | Method for improving flatness of X70M pipeline steel plate through secondary straightening |
| CN114160609B (en) * | 2021-11-18 | 2023-07-04 | 山东钢铁集团日照有限公司 | Method for efficiently cold straightening thin-specification buckling steel plate |
| CN114231718B (en) * | 2021-11-18 | 2024-03-19 | 首钢京唐钢铁联合有限责任公司 | Pipeline steel with narrow strength and same plate difference and production method thereof |
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| CN102671941A (en) * | 2012-06-11 | 2012-09-19 | 南京钢铁股份有限公司 | Process for producing thin gauge pipeline steel by using double-stand medium and heavy plate mill |
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| JPS5926371B2 (en) * | 1980-05-31 | 1984-06-27 | 住友金属工業株式会社 | Cooling equipment for hot rolled steel sheets |
| DE19654068A1 (en) * | 1996-12-23 | 1998-06-25 | Schloemann Siemag Ag | Method and device for rolling a rolled strip |
| CN100503062C (en) * | 2006-12-28 | 2009-06-24 | 鞍钢股份有限公司 | Shape control method for pipeline steel hot rolled slab |
| CN202322933U (en) * | 2011-11-14 | 2012-07-11 | 湖南华菱湘潭钢铁有限公司 | Production system of high-toughness ultrahigh-intensity steel |
| CN102513370A (en) * | 2011-12-16 | 2012-06-27 | 南京钢铁股份有限公司 | Control process for single-stand Steckel mill to produce special-purpose pipeline steel |
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| CN102671941A (en) * | 2012-06-11 | 2012-09-19 | 南京钢铁股份有限公司 | Process for producing thin gauge pipeline steel by using double-stand medium and heavy plate mill |
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