CN111842546A - Equipment and method for improving TMCP wide and thick plate secondary plate shape - Google Patents
Equipment and method for improving TMCP wide and thick plate secondary plate shape Download PDFInfo
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- CN111842546A CN111842546A CN202010662995.3A CN202010662995A CN111842546A CN 111842546 A CN111842546 A CN 111842546A CN 202010662995 A CN202010662995 A CN 202010662995A CN 111842546 A CN111842546 A CN 111842546A
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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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- 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
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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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
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
- B21D43/08—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract
The invention discloses equipment and a method for improving the secondary plate shape of a TMCP wide and thick plate, relates to the technical field of plate shape control of wide and thick plates, and solves the technical problem of secondary plate shape of a steel plate caused by adopting a TMCP process to produce the steel plate in the prior art. The equipment comprises a cooling bed and a temperature straightening machine with the straightening temperature of 100-plus-300 ℃, wherein the input end of the cooling bed is connected with water cooling equipment through a first roller way, the output end of the cooling bed is connected with the temperature straightening machine through a second roller way, and the first roller way, the cooling bed and the second roller way are configured to cool a steel plate to 100-plus-300 ℃ and lower than the phase change termination temperature of the steel plate. Compared with the prior art, the invention cancels a hot straightening process and a cold straightening process, directly enters a warm straightening machine for straightening after the steel plate is cooled to the temperature below the phase transition termination temperature through a cooling bed, can straighten and form the steel plate at one time without generating the problem of secondary plate shape, reduces the hot straightening process, saves the lifting process required by the cold straightening process of the steel plate, saves the cost and improves the efficiency.
Description
Technical Field
The invention relates to the technical field of plate shape control of wide and thick plates, in particular to equipment and a method for improving TMCP (thermal mechanical control processing) wide and thick plate secondary plate shape.
Background
The TMCP process is widely applied to the production and manufacturing of wide and thick plates at the present stage, the strength of the steel plate is effectively improved, and the alloy adding cost is reduced. However, the TMCP itself is accompanied by a large residual stress due to its process characteristics, and thus a serious problem of plate shape is caused. Some steel plates, especially steel plates with yield strength of more than 550MPa, can be straightened although the plate shape is straightened because the phase change is not completely finished after water cooling, but the problem of plate shape reappearance of the steel plates is caused by the action of residual phase change stress and thermal stress in the subsequent continuous cooling process, which is expressed as the plate shape problems of single-side waves, double-side waves, middle waves or rib waves and the like. Therefore, the steel plate is usually required to be secondarily straightened by the cold straightening machine, and the steel plate is required to be lifted by adopting the cold straightening mode, so that the working efficiency of steel plate production is greatly reduced. Meanwhile, the logistics cost of the steel plate is high, and the process is complex.
Disclosure of Invention
In view of the above, the present invention aims to overcome the defects of the prior art, and in a first aspect, provides a device for improving the secondary plate shape of a TMCP wide-thick plate, so as to solve the technical problem of the secondary plate shape of a steel plate caused by the adoption of a TMCP process for producing a steel plate in the prior art.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the equipment for improving the secondary plate shape of the TMCP wide and thick plate comprises a cooling bed and a temperature straightening machine with the straightening temperature of 100-plus-300 ℃, wherein the input end of the cooling bed is connected with the output end of water-cooling equipment through a first roller way, the output end of the cooling bed is connected with the input end of the temperature straightening machine through a second roller way, so that a steel plate is directly fed into the temperature straightening machine for straightening through the cooling bed after being output from the water-cooling equipment, and the first roller way, the cooling bed and the second roller way are configured to cool the steel plate to 100-plus-300 ℃ and lower than the phase change termination temperature of the steel plate.
On the basis of the technical scheme, the equipment for improving the secondary plate shape of the TMCP wide-thick plate can be further improved as follows.
Optionally, the first roller way and the second roller way are parallel to each other, and a plurality of groups of cooling beds are arranged between the first roller way and the second roller way.
Optionally, the number of the straightening rollers of the warm straightening machine is 7, and the straightening speed of the warm straightening machine is 0.5 m/s.
Optionally, a hot straightening machine is further arranged on the first roller way, and the height of the roll gap of the hot straightening machine is adjusted to be larger than the thickness of the steel plate.
In a second aspect, the present invention further provides a method for improving the secondary plate shape of a TMCP wide thick plate, using the above apparatus for improving the secondary plate shape of a TMCP wide thick plate, where a steel plate is delivered from the water cooling apparatus, and then directly enters a temperature straightener through a cooling bed for straightening, where:
The first roller way, the cooling bed and the second roller way cool the steel plate to 100-300 ℃ and lower than the phase transformation termination temperature of the steel plate.
On the basis of the technical scheme, the method for improving the secondary plate shape of the TMCP wide-thick plate can be further improved as follows.
Optionally, the steel plate comprises the following chemical components in percentage by mass:
c: 0.05 to 0.1 percent; si: 0.2 percent; mn: 1.3 to 1.8 percent; ni: 0.1 to 0.3 percent; cr: 0.1 to 0.4 percent; nb: 0.03-0.07%; ti: 0.01 to 0.04 percent; mo: 0.1 to 0.3 percent; the balance of Fe and impurities.
Optionally, the steel plate has a thickness of 12-20mm, a width of 2.5-4m and a length of 24-40 m.
Optionally, the cooling rate of the steel plate by the water cooling equipment is 10-30 ℃/s, the final cooling temperature of the steel plate after being cooled by the water cooling equipment is below 500 ℃, and the yield strength of the steel plate is 550-700 Mpa.
Optionally, the temperature of the steel plate before entering the temperature straightening machine is 100-300 ℃.
Optionally, the first roller way, the cooling bed and the second roller way are naturally cooled.
Compared with the prior art, the equipment for improving the secondary plate shape of the TMCP wide and thick plate has the beneficial effects that:
compared with the prior art, the invention cancels a hot straightening process and a cold straightening process, directly enters a warm straightening machine for straightening after the steel plate is cooled to the temperature below the phase transition termination temperature through a cooling bed, can straighten and form the steel plate at one time without generating the problem of secondary plate shape, reduces the hot straightening process, saves the lifting process required by the cold straightening process of the steel plate, saves the cost and improves the efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the equipment for improving the secondary plate shape of a TMCP wide-thick plate;
FIG. 2 is a flow chart of the method for improving the secondary plate shape of the TMCP wide-thick plate.
In the figure:
1-water cooling equipment; 2-a thermal straightener; 3-a first roller bed; 4, cooling the bed; 5-a second roller way; 6-temperature straightening machine.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely a few embodiments of the invention and are not to be taken as a comprehensive embodiment. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1:
in the prior art, a steel plate is rolled by a TMCP (thermal mechanical control processing) process and then enters a water cooling device 1 for cooling, and different cooling rates of the water cooling device 1 are adjusted to enable the steel plate to be of different varieties. The water cooling equipment 1 generally adopts an ACC cooling system or an ultra-fast cooling system. After being output from the water cooling device 1, the steel plate firstly enters a hot straightening machine 2 for hot straightening. Because the straightening temperature of the hot straightening machine 2 is generally 500-800 ℃, the phase change of the steel plate is not completely finished in the water cooling equipment 1, the phase change can continuously occur when the steel plate is cooled on the cooling bed 4 after the hot straightening, larger residual phase change stress and thermal stress can be continuously generated, and a new plate shape problem can still occur on the cooling bed 4 even if the hot straightening machine 2 straightens the steel plate. Therefore, whether the steel plate on the cooling bed 4 has obvious secondary plate shape defects needs to be observed manually, and if the steel plate has the obvious secondary plate shape defects, the steel plate needs to be lifted to a cold straightening machine with the straightening temperature of 0-100 ℃ for secondary straightening.
After the steel plate is rolled by adopting the TMCP process, the steel plate is generally straightened by adopting a mode that the hot straightener 2 is matched with the cold straightener, which is a conventional treatment mode in the field. With the continuous enrichment of the varieties of the wide and thick plates and the continuous improvement of the yield, the problem of the secondary shape of the steel plate becomes more and more serious. Because the temperature of the steel plate before entering the cold straightening machine is too high, the steel plate can enter the cold straightening machine for straightening after being cooled to 0-100 ℃. Therefore, when the cold straightening machine is used for straightening the steel plate, the steel plate must be lifted off the production line, and the steel plate cannot be directly conveyed into the cold straightening machine.
The invention provides equipment for improving the secondary plate shape of a TMCP wide and thick plate, which comprises a cooling bed 4 and a temperature straightening machine 6 with the straightening temperature of 100 ℃ and 300 ℃, as shown in figure 1. The input end of the cooling bed 4 is connected with the output end of the water cooling equipment 1 through the first roller way 3, and the output end of the cooling bed 4 is connected with the input end of the temperature straightening machine 6 through the second roller way 5. The steel plate is conveyed to the cooling bed 4 through the first roller way 3 for cooling after being output from the water cooling equipment 1, is cooled to 100-plus-300 ℃ by the first roller way 3, the cooling bed 4 and the second roller way 5, is lower than the phase transition termination temperature, and directly enters the temperature straightening machine 6 for straightening through the second roller way 5.
Compared with the prior art, the invention cancels the hot straightening process and the cold straightening process adopted when the steel plate is straightened by the traditional TMCP process, and the steel plate directly enters the warm straightener 6 for straightening after being cooled by the first roller bed 3, the cold bed 4 and the second roller bed 5. Because the temperature of the cooled steel plate is lower than the phase transition termination temperature, the invention can shape the steel plate by straightening the steel plate once and can not generate the problem of secondary plate shape. The temperature straightening machine 6 can straighten the steel plate with temperature, the steel plate does not need to be lifted and unloaded off the line, the steel plate is always kept on the line, the steel plate straightening process is simplified, two devices of the hot straightening machine 2 and the cold straightening machine are reduced, and the lifting process required by the cold straightening process of the steel plate is also omitted. Not only saves the process cost, but also saves the equipment cost, and improves the efficiency of steel plate production.
As shown in fig. 1, in order to further improve the efficiency of steel plate production, the first roller table 3 and the second roller table 5 are parallel to each other, and a plurality of sets of cooling beds 4 are disposed between the first roller table 3 and the second roller table 5. Different types of steel plates can be cooled on different cooling beds 4 and finally are completely straightened and formed in one step by the temperature straightening machine 4. The number of the straightening rolls of the warm straightening machine 4 was 7 rolls, and the straightening speed of the warm straightening machine 4 was 0.5 m/s. Of course, according to the production requirements of different varieties of steel plates, the number of the straightening rollers of the warm straightening machine 4 can also be selected from 11 rollers, 15 rollers or more, and the straightening speed of the warm straightening machine 4 can also be selected from 0.3m/s, 0.7m/s or other straightening speeds.
As shown in FIG. 1, the invention can also reserve a hot straightening machine 2 which is also arranged on the first roller bed 3 when the steel plate is straightened by the traditional TMCP process. For the steel plate which does not need to be subjected to thermal straightening, the height of the roll gap of the thermal straightening machine 2 is adjusted to be larger than the thickness of the steel plate, and the steel plate directly enters the cooling bed 4 from the thermal straightening machine 2 through the air for cooling. For the steel plate needing hot straightening, the roll gap height of the hot straightening machine 2 is adjusted according to the straightening requirement of the steel plate. The roll gap height of the general hot straightener 2 can be adjusted to 350mm, and in this embodiment, the roll gap height of the hot straightener 2 is adjusted to 300 mm.
Example 2:
the invention also provides a method for improving the secondary plate shape of the TMCP wide and thick plate, as shown in figure 2, and the equipment for improving the secondary plate shape of the TMCP wide and thick plate is used. The chemical element proportion in the TMCP process influences the starting temperature, transformation products and transformation termination temperature of the phase transformation of the steel plate. For example, conventional wide and thick plate products are mainly medium and low carbon content, and as the carbon content and alloy elements are increased, the austenite stability is enhanced, and the starting temperature of the transformation is lowered. The transformation products vary with the composition of the steel sheet. The critical cooling rate is different according to the carbon equivalent of the steel plate. For example, martensite, bainite, and ferrite can be generated at a cooling rate from high to low. Generally, the carbon equivalent of the steel plate is increased along with the increase of the alloy elements, the higher the carbon equivalent is, the easier the carbon equivalent is to be transformed into a martensite structure, the martensite structure has the highest strength, and the problem of plate shape is easily caused. As the alloy content increases, the transition termination temperature also decreases. This means that the transformation of the steel sheet with a high alloy content is not completely completed in the water cooling device 1 at a high final cooling temperature.
In the invention, the steel plate rolled by the TMCP process comprises the following chemical components in percentage by mass: c: 0.05 to 0.1 percent; si: 0.2 percent; mn: 1.3 to 1.8 percent; ni: 0.1 to 0.3 percent; cr: 0.1 to 0.4 percent; nb: 0.03-0.07%; ti: 0.01 to 0.04 percent; mo: 0.1 to 0.3 percent; the balance of Fe and impurities. The thickness of the steel plate is 12-20mm, the width is 2.5-4m, and the length is 24-40 m.
As shown in FIG. 2, the cooling rate of the steel plate with the chemical composition in percentage by mass in the water cooling equipment 1 is 10-30 ℃/s, the final cooling temperature of the steel plate after being cooled by the water cooling equipment 1 is below 500 ℃, and the yield strength of the steel plate is 550-700 MPa. The steel plate is transformed into bainite with the phase transition termination temperature of 300 ℃ after being discharged from the water cooling device 1, is conveyed through a first roller bed 3 and passes through a hot straightening machine 2, and then is cooled through a cooling bed 4 and enters a warm straightening machine 6 through a second roller bed 5 for straightening. And the cooling modes adopted by the first roller way 3, the cooling bed 4 and the second roller way 5 are natural air cooling. The temperature of the steel plate after natural air cooling is 100-300 ℃, and then the steel plate enters a temperature straightening machine 6 for straightening, and the steel plate does not undergo phase change after temperature straightening.
In the whole straightening process, the steel plate is straightened and formed once only by the warm straightening machine 6, and the problem of plate shape can not occur again because the temperature of the steel plate is lower than the phase transition termination temperature after straightening. And the whole straightening process of the steel plate does not need to be processed off-line, and does not need to be processed by the hot straightening machine 2 and the cold straightening machine, so that the process is simplified, the production cost is saved, and the production efficiency is improved.
It can be understood that the method for improving the secondary plate shape of the TMCP wide and thick plate is not limited to the production of a bainite steel plate, and can be used for improving the plate shape of martensite or ferrite steel and other types of steel according to different chemical element compositions of the steel plate, different water cooling rates, different final cooling temperatures of the water cooling equipment 1 and different yield strengths of the steel plate, and the steel plate can be formed at one time.
Example 3:
the steel plate rolled by the TMCP process comprises the following chemical components in percentage by mass: the content of C is 0.06%; the Si content is 0.2%; the Mn content is 1.3%; the Ni content is 0.2%; the content of Cr is 0.1 percent; the Nb content is 0.03 percent; the Ti content is 0.01 percent; the Mo content is 0.1%; the balance of Fe and impurities. The steel plate has a thickness of 15mm, a width of 2.5m and a length of 24 m.
The cooling rate of the steel plate in the water cooling device 1 is 20 ℃/s, the final cooling temperature of the steel plate after being cooled by the water cooling device 1 is 500 ℃, and the yield strength of the steel plate is 570 MPa. The cooled steel plate is conveyed on a first roller way 3, the height of a roll gap of the hot straightener 2 is 300mm, and the steel plate passes through the cold bed 4 and transversely moves. The cooling bed 4 adopts a rolling disc type cooling bed, and the steel plate is naturally cooled on the cooling bed 4. And then, the steel plate enters a temperature straightener 6 through a second roller way 5 for straightening, and the temperature of the steel plate entering the temperature straightener 6 is 100 ℃. Finally, the steel plate is straightened by the straightening roller number of 7 rollers, the straightening speed is 0.5m/s, the straightening reduction is 3mm, the steel plate is straightened for 3 times, and the steel plate is straight.
Example 4:
the steel plate rolled by the TMCP process comprises the following chemical components in percentage by mass: the content of C is 0.09%; the Si content is 0.2%; the Mn content is 1.7%; the Ni content is 0.1%; the content of Cr is 0.3 percent; the Nb content is 0.05 percent; the Ti content is 0.03%; the Mo content is 0.2%; the balance of Fe and impurities. The steel plate has a thickness of 25mm, a width of 2.5m and a length of 24 m.
The cooling rate of the steel plate in the water cooling device 1 is 25 ℃/s, the final cooling temperature of the steel plate after being cooled by the water cooling device 1 is 400 ℃, and the yield strength of the steel plate is 700 MPa. The cooled steel plate is conveyed on a first roller way 3, the height of a roll gap of the hot straightener 2 is 300mm, and the steel plate passes through the cold bed 4 and transversely moves. The cooling bed 4 adopts a rolling disc type cooling bed, and the steel plate is naturally cooled on the cooling bed 4. And then, the steel plate enters a temperature straightener 6 through a second roller way 5 for straightening, and the temperature of the steel plate entering the temperature straightener 6 is 200 ℃. Finally, the steel plate is straightened by the straightening roller number of 7 rollers, the straightening speed is 0.5m/s, the straightening reduction is 4mm, the straightening is carried out for 3 times, and the steel plate is straight.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. The equipment for improving the secondary plate shape of the TMCP wide and thick plate is characterized by comprising a cooling bed (4) and a temperature straightening machine (6) with the straightening temperature of 100-300 ℃, wherein the input end of the cooling bed (4) is connected with the output end of water cooling equipment (1) through a first roller way (3), the output end of the cooling bed (4) is connected with the input end of the temperature straightening machine (6) through a second roller way (5), so that a steel plate is directly conveyed into the temperature straightening machine (6) through the cooling bed (4) to be straightened after being output from the water cooling equipment (1), and the first roller way (3), the cooling bed (4) and the second roller way (5) are configured to cool the steel plate to 100-300 ℃ and lower than the phase change termination temperature of the steel plate.
2. The apparatus for improving the secondary plate shape of TMCP wide and thick plates according to claim 1, wherein the first roller table (3) and the second roller table (5) are parallel to each other, and a plurality of groups of cooling beds (4) are arranged between the first roller table (3) and the second roller table (5).
3. The apparatus for improving the secondary plate shape of TMCP wide-thick plates according to claim 1, wherein the number of the straightening rolls of the warm straightener (4) is 7 rolls, and the straightening speed of the warm straightener (4) is 0.5 m/s.
4. The apparatus for improving the secondary plate shape of TMCP wide-thick plates according to claim 1, wherein a hot straightener (2) is further provided on the first roller table (3), and the roll gap height of the hot straightener (2) is adjusted to a height greater than the thickness of the steel plate.
5. A method for improving the secondary plate shape of TMCP wide and thick plates, characterized in that the equipment for improving the secondary plate shape of TMCP wide and thick plates, as claimed in any one of claims 1 to 4, is used, and the steel plate is delivered from the water cooling equipment (1) and then directly enters a temperature straightener (6) through a cooling bed (4) for straightening, wherein:
the first roller way (3), the cooling bed (4) and the second roller way (5) cool the steel plate to 100-300 ℃ and lower than the phase transformation termination temperature of the steel plate.
6. The method for improving the secondary plate shape of the TMCP wide-thick plate according to claim 5, wherein the steel plate comprises the following chemical components in percentage by mass:
c: 0.05 to 0.1 percent; si: 0.2 percent; mn: 1.3 to 1.8 percent; ni: 0.1 to 0.3 percent; cr: 0.1 to 0.4 percent; nb: 0.03-0.07%; ti: 0.01 to 0.04 percent; mo: 0.1 to 0.3 percent; the balance of Fe and impurities.
7. A method for improving the secondary plate shape of TMCP wide and thick plates according to claim 6, wherein the thickness of the steel plate is 12-20mm, the width is 2.5-4m, and the length is 24-40 m.
8. The method for improving the secondary plate shape of the TMCP wide and thick plate as claimed in claim 7, wherein the cooling rate of the steel plate by the water cooling equipment (1) is 10-30 ℃/s, the final cooling temperature of the steel plate after being cooled by the water cooling equipment (1) is below 500 ℃, and the yield strength of the steel plate is 550-700 MPa.
9. The method for improving the secondary plate shape of the TMCP wide and thick plate according to claim 8, wherein the temperature of the steel plate before entering the temperature straightener (6) is 100-300 ℃.
10. The method for improving the secondary plate shape of TMCP wide and thick plates according to any of claims 5 to 9, wherein the cooling method adopted by the first roller table (3), the cooling bed (4) and the second roller table (5) is natural air cooling.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112620357A (en) * | 2020-12-03 | 2021-04-09 | 张家港宏昌钢板有限公司 | Rolling control method of 4-time length pipeline steel |
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