CN112337968A - Multifunctional hot-rolled plate strip production unit and production method thereof - Google Patents
Multifunctional hot-rolled plate strip production unit and production method thereof Download PDFInfo
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- CN112337968A CN112337968A CN202011181572.6A CN202011181572A CN112337968A CN 112337968 A CN112337968 A CN 112337968A CN 202011181572 A CN202011181572 A CN 202011181572A CN 112337968 A CN112337968 A CN 112337968A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
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Abstract
The invention discloses a multifunctional hot-rolled plate strip production unit, which comprises a continuous casting machine, a first shearing machine, a first stack plate pushing device, a first heating device, a first descaling device, a roughing mill set, a second heating device, a first cooling device, a second descaling device, a finishing mill set, a second cooling device, a third shearing machine and an underground coiler which are sequentially arranged along a rolling line, wherein the first shearing machine is arranged on the continuous casting machine; and a second shearing machine and a second stack plate pushing device are sequentially arranged between the roughing mill group and the second heating device along the rolling direction. The invention also provides various rolled piece production methods based on the production unit. The invention has the beneficial effects that: the invention can realize multi-process multi-mode on-line switching production and meet the production requirements of small batch and various specifications.
Description
Technical Field
The invention belongs to the technical field of hot rolling, and particularly relates to a multifunctional hot-rolled plate strip production unit and a production method thereof.
Background
At present, the widely used endless rolling technology for hot-rolled strip steel at home and abroad is the Puriet ESP technology, and the unit arrangement mainly comprises: continuous casting machine → three-frame roughing mill group → pendulum shear → push-out and plate stacking device/heat preservation cover → rotary hub shear → induction heating furnace → high-pressure water descaler → five-frame finishing mill group → laminar cooling system → high-speed flying shear → underground coiler. Compared with the traditional thin slab continuous casting and rolling process, the ESP process has the advantages of short process flow, compact equipment arrangement, energy conservation, environmental protection and low production cost. However, in actual production, some problems are encountered, mainly as follows: the ESP production line has high rigidity, particularly the equipment arrangement between the continuous casting section and the rolling section is very compact, the two processes of continuous casting and steel rolling need to be highly closely matched, the requirement on production organization management is high, the production flexibility is poor, and once a unit breaks down, the buffering time is short, and the accident handling is difficult. In addition, the method cannot be flexibly switched to other production modes (such as medium plate production and continuous casting billet production) and production processes (such as ferrite rolling process), so that the adaptability to the production of various specifications is poor.
Disclosure of Invention
The invention aims to provide a multifunctional hot-rolled strip production unit and a production method thereof aiming at the defects of the prior art, and solves the problems that the prior art cannot realize multi-process multi-mode online switching production and cannot meet the production requirements of small-batch multi-variety specifications.
The technical scheme adopted by the invention is as follows: a multifunctional hot-rolled plate strip production unit comprises a continuous casting machine, a first shearing machine, a first stack plate pushing device, a first heating device, a first descaling device, a roughing mill unit, a second heating device, a first cooling device, a second descaling device, a finishing mill unit, a second cooling device, a third shearing machine and an underground coiler which are sequentially arranged along a rolling line.
According to the scheme, a second shearing machine and a second stacking plate pushing device are sequentially arranged between the rough rolling unit and the second heating device along the rolling direction.
According to the scheme, a fourth shearing machine is arranged between the second plate pushing and stacking device and the second heating device.
According to the scheme, a first heat-preservation cover is further arranged at the first stack pushing plate device, and a second heat-preservation cover is further arranged at the second stack pushing plate device.
According to the scheme, the first shearing machine and the second shearing machine are both pendulum shears, the third shearing machine is a high-speed flying shear, and the fourth shearing machine is a rotary hub shear; the first heating device is a roller hearth type heating furnace, and the second heating device is an induction heating furnace.
The invention also adopts a production method of endless rolling strip steel based on the production unit, which comprises the following steps in sequence: continuous casting, heating, descaling, rough rolling, heat preservation, heating or cooling, descaling, finish rolling, laminar cooling, shearing and coiling.
The invention also adopts a production method of the semi-endless rolled strip steel based on the production unit, which comprises the following steps in sequence: continuous casting, heating, descaling, rough rolling, shearing, heat preservation, heating or cooling, descaling, finish rolling, laminar cooling, shearing and coiling.
According to the scheme, the production method adopts any one of a recrystallization type controlled rolling and controlled cooling process, a thermomechanical rolling process and a ferrite rolling process,
when a recrystallization type controlled rolling and controlled cooling process is adopted, the inlet temperature of finish rolling is 1030-1080 ℃, and the finish rolling temperature of the finish rolling is 880-930 ℃;
when a thermomechanical rolling process is adopted, the finish rolling inlet temperature is 980-1020 ℃, and the finish rolling temperature is 840-880 ℃;
when a ferrite rolling process is adopted, the finish rolling inlet temperature is 830-860 ℃, and the finish rolling temperature is 750-810 ℃.
The invention also adopts a medium plate production method based on the production unit, which comprises the following steps in sequence: continuous casting, heating, descaling, rough rolling, shearing and pushing out of line.
The invention also adopts a continuous casting billet production method based on the production unit, which comprises the following steps in sequence: continuous casting, shearing and pushing out the lower wire.
The invention has the beneficial effects that:
(1) the hot-rolled strip production unit can realize a headless rolled strip steel production mode, a continuous casting blank is continuously cast by a casting machine in a casting period, the continuous casting blank is directly subjected to the main processes of heating, descaling, rolling, laminar cooling and the like and then coiled and coiled, and the continuous casting blank is continuous from continuous casting to strip steel coiling and shearing in the whole production process, so that for producing thin-specification strip steel (the thickness of a finished product is less than 4 mm), the times of head cutting, tail cutting, strip threading and tail throwing can be greatly reduced, the product yield is high (more than 98%), the full-length temperature, the microstructure and the mechanical property of the strip steel are uniform, the thickness and the width precision are high, and the plate convexity and the flatness are good.
(2) The hot-rolled strip production unit can realize a semi-endless rolling strip steel production mode, a continuous casting blank cast by a continuous casting machine is subjected to heating, descaling and rough rolling, then the intermediate blank is cut by a shearing machine according to the size of a single steel coil or a plurality of steel coils, and then the intermediate blank is subjected to coiling and coiling after main processes such as rolling, laminar cooling and the like, the rough rolling and the finish rolling are disconnected in the whole production process, so that for producing thick strip steel (the thickness of a finished product is 4-10 mm), the finish rolling speed of the intermediate blank can be increased, the finish rolling temperature drop and the heat loss are reduced, and the production capacity of a finishing mill unit is improved.
(3) The hot-rolled plate strip production unit adopts a double-buffer-section arrangement mode, namely, a shearing machine and a stack plate pushing device are adopted as buffer sections between a continuous casting machine and a rough rolling unit and between the rough rolling unit and a finishing rolling unit; when an accident occurs in the later process, the continuous casting blank or the intermediate blank is cut off by the shearing machine, the former process and the later process are disconnected, and then the continuous casting blank or the intermediate blank is moved out of the rolling line by the push-out stacking plate device, so that the production mode of the continuous casting blank or the intermediate plate can be realized, and the purposes of buffering and coordinated production can be achieved.
(4) The hot-rolled strip production unit is provided with the heating device and the cooling device in front of the finishing mill unit, and the heating device and the cooling device are used for adjusting the finish rolling inlet temperature of the intermediate billet, so that a recrystallization type controlled rolling and controlled cooling process, a thermal mechanical rolling process and a ferrite rolling process are realized, and the requirements of the structure performance of different steel products are met.
Drawings
Fig. 1 is a schematic overall layout of one embodiment of the present invention.
FIG. 2 is a schematic diagram of the production of endless rolled steel strip in this example.
FIG. 3 is a schematic diagram of the production of a semi-endless rolled steel strip in this embodiment.
FIG. 4 is a schematic view illustrating the production of the medium plate of the present embodiment.
Fig. 5 is a schematic diagram of the production of the continuous casting slab in the embodiment.
Wherein: 1. a continuous casting machine; 2. a first shear; 3. a first ejection pallet means; 4. a roller hearth furnace; 5. a first descaling device; 6. a roughing mill train; 7. a second shear; 8. a second ejection pallet means; 9. hub scissors are rotated; 10. an induction heating furnace; 11. a first cooling device; 12. a second descaling device; 13. a finishing mill group; 14. a second cooling device; 15. high-speed flying shears; 16. an underground coiler; 17. a first heat-insulating cover; 18. and a second heat-preserving cover.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
A multifunctional hot-rolled plate strip production unit comprises a continuous casting machine 1, a first shearing machine 2, a first stack plate pushing device 3, a first heating device, a first descaling device 5, a roughing mill unit 6, a second heating device, a first cooling device 11, a second descaling device 12, a finishing mill unit 13, a second cooling device 14, a third shearing machine and an underground coiler 16 which are sequentially arranged along a rolling line. In the present invention, all the devices constituting the above-mentioned unit are existing devices, and are not described herein again.
Preferably, between the roughing train 6 and the second heating device, in the rolling direction, there are arranged in succession a second shear 7 and a second ejection plate device 8.
Preferably, between the second ejection stacking device 8 and the second heating device there is a fourth shear.
Preferably, a first heat-insulating cover 17 is arranged at the first ejection pallet means 3 and a second heat-insulating cover 18 is arranged at the second ejection pallet means 8.
In the invention, the first shearing machine 2 and the second shearing machine 7 are preferably pendulum shears, the third shearing machine is preferably a high-speed flying shear 15, and the fourth shearing machine is preferably a rotary hub shear 9; the continuous casting machine 1 is a straight arc continuous casting machine 1, and 2-3 underground recoiling machines 16 are configured. The roughing mill group 6 and the finishing mill group 13 are both four-high mills, the number of the frames of the roughing mill group 6 is 2-3, and the number of the frames of the finishing mill group 13 is 5-6. The first heating means is preferably a roller hearth furnace 4 and the second heating means is preferably an induction furnace 10. The first and second descaling devices 5 and 12 are both high-pressure water descalers, and the first and second cooling devices 11 and 14 are preferably laminar flow cooling devices.
The production method of endless rolling strip steel based on the production unit is used for producing the strip steel with the finished product thickness of less than 4mm in a full-continuous mode. The method comprises the following steps of: continuous casting, heating, descaling, rough rolling, heat preservation, heating or cooling, descaling, finish rolling, laminar cooling, shearing and coiling.
The production method of the semi-endless rolling strip steel based on the production unit is used for producing the strip steel with the thickness of 4 mm-10 mm. The method comprises the following steps of: continuous casting, heating, descaling, rough rolling, shearing, heat preservation, heating or cooling, descaling, finish rolling, laminar cooling, shearing and coiling.
In the above-mentioned two strip steel production methods, any one of recrystallization type controlled rolling and controlled cooling process, thermomechanical rolling process and ferrite rolling process can be adopted,
when a recrystallization type controlled rolling and controlled cooling process is adopted, the inlet temperature of finish rolling is 1030-1080 ℃, and the finish rolling temperature of the finish rolling is 880-930 ℃;
when a thermomechanical rolling process is adopted, the finish rolling inlet temperature is 980-1020 ℃, and the finish rolling temperature is 840-880 ℃;
when a ferrite rolling process is adopted, the finish rolling inlet temperature is 830-860 ℃, and the finish rolling temperature is 750-810 ℃.
The medium plate production method based on the production unit is used for producing medium plates with the finished product thickness of 10 mm-20 mm when the finishing mill unit 13 breaks down. The method comprises the following steps of: continuous casting, heating, descaling, rough rolling, shearing and pushing out of line.
A continuous casting billet production method based on the production unit is used for producing a continuous casting billet with the thickness of 70 mm-110 mm when the roughing mill unit 6 breaks down. The method comprises the following steps of: continuous casting, shearing and pushing out the lower wire.
Examples
The multifunctional hot-rolled strip production unit shown in fig. 1 comprises a continuous casting machine 1, a first shearing machine 2, a first stack plate pushing device 3, a roller hearth type heating furnace 4, a first descaling device 5, a roughing mill unit 6, a second shearing machine 7, a second stack plate pushing device 8, a hub shear 9, an induction heating furnace 10, a first cooling device 11, a second descaling device 12, a finishing mill unit 13, a second cooling device 14, a high-speed flying shear 15 and an underground coiler 16 which are sequentially arranged.
The first shearing machine 2 and the second shearing machine 7 are preferably pendulum shears, have strong shearing capacity and are beneficial to rapidly shearing thick-specification blanks. The first descaling device 5 and the second descaling device 12 are preferably high-pressure water descaling machines, and can rapidly remove scale on the surface of the blank. The first cooling device 11 and the second cooling device 14 are preferably laminar cooling devices, which can rapidly and precisely control the temperature of the intermediate blank and the strip steel so as to obtain the ideal microstructure and mechanical properties.
And a first heat-insulating cover 17 is arranged at the first push-out stacking plate device 3, and a second heat-insulating cover 18 is arranged at the second push-out stacking plate device 8 and is respectively used for insulating the continuous casting billets and the intermediate billets so as to reduce the temperature drop and reduce the energy consumption of a heating device. When the unit fails and the first pushing stacking plate device 3 or the second pushing stacking plate device 8 is put into use, the first heat-preserving cover 17 or the second heat-preserving cover 18 is lifted and is not put into use.
The roughing mill set 6 adopted in the embodiment is 3, and can roll the continuous casting blank with the thickness of 70-110 mm into an intermediate blank with the thickness of 10-20 mm. The adopted finishing mill group 13 is 5, and the intermediate blank with the thickness of 10-20 mm can be rolled into finished product strip steel with the minimum thickness of 0.8 mm. And coiling the split strip steel by using an underground coiler 16. The underground recoiling machines 16 have 3 in total, only 2 of the underground recoiling machines are used during normal production, the recoiled strip steel is alternately recoiled, the other 1 is standby, and when one recoiling machine fails, the standby recoiling machine is switched to perform recoiling so as to ensure continuous production.
In the present embodiment, a shearing machine and a stack plate pushing device are used as buffer sections between the continuous casting machine 1 and the rough rolling unit 6 and between the rough rolling unit 6 and the finishing rolling unit 13. When an accident occurs in the later process, the corresponding shearing machine shears the continuous casting billet or the intermediate billet to disconnect the former process and the later process, and then the corresponding stack plate pushing device moves the continuous casting billet or the intermediate billet out of the rolling line to achieve the purposes of buffering and coordinated production, so that the flexibility between the continuous casting section and the rolling section can be improved, and the production operation flexibility of the whole unit is greatly improved. Because the buffer section is longer, the temperature of the continuous casting blank or the intermediate blank is greatly reduced (the temperature is reduced by about 100 ℃) after continuously passing through the buffer section, and therefore a heating device needs to be arranged behind the stacking plate pushing device for rapid heat compensation so as to meet the temperature requirement of rough rolling or finish rolling. In the embodiment, the roller hearth type heating furnace 4 is adopted between the continuous casting machine 1 and the roughing mill unit 6, has strong heating capacity and is suitable for heating thick continuous casting billets; an induction heating furnace 10 is used between the roughing mill train 6 and the finishing mill train 13, which is suitable for rapidly heating an intermediate billet having a small thickness.
For convenience of description, according to the position of the rolled piece (i.e., the thickness of the rolled piece), the rolled piece is respectively called a continuous casting billet, an intermediate billet and a hot rolled strip, wherein the rolled piece between the continuous casting machine 1 and the inlet of the roughing mill group 6 is called a continuous casting billet, the rolled piece between the inlet of the roughing mill group 6 and the inlet of the finishing mill group 13 is called an intermediate billet, and the rolled piece after the inlet of the finishing mill group 13 is called a hot rolled strip. The production unit in this embodiment can realize the following four production methods.
1. The production method of endless rolling strip steel based on the production unit is mainly used for producing the strip steel with the finished product thickness of less than 4mm in a full-continuous mode. The method comprises the following steps of: continuous casting, heating, descaling, rough rolling, heat preservation, heating or cooling, descaling, finish rolling, laminar cooling, shearing and coiling. The method comprises the following specific steps:
as shown in fig. 2, firstly, a continuous casting blank (continuous casting) is cast by a continuous casting machine 1, the continuous casting blank is continuously subjected to heat preservation by a first heat preservation cover 17, heat compensation (heating) is performed by a roller hearth type heating furnace 4, primary surface iron scales (descaling) are removed by a first descaling device 5, a roughing mill unit 6 is subjected to high reduction rolling and then becomes an intermediate blank (roughing), the intermediate blank is continuously subjected to heat preservation by a second heat preservation cover 18, rapid heat compensation is performed by an induction heating furnace 10 or cooling (heating or cooling) is performed by a first cooling device 11, secondary surface iron scales (descaling) are removed by a second descaling device 12, the intermediate blank enters a finishing mill unit 13 to be rolled to obtain a hot rolled finished product strip steel (finish rolling), and is subjected to cooling (laminar cooling) by a laminar cooling system, and is subjected to split shearing by a high-speed flying shear 15 and is coiled by an.
In the whole production process, the first shearing machine 2, the first stack plate pushing device 3, the second shearing machine 7, the second stack plate pushing device 8 and the hub shearing machine 9 are not thrown in, and continuous casting billets, intermediate billets and hot rolled strip steel before the high-speed flying shear 15 are continuous without interruption, so that the production mode is called a headless rolling production mode.
2. The production method of the semi-endless rolling strip steel based on the production unit is used for producing the strip steel with the thickness of 4 mm-10 mm. The method comprises the following steps which are carried out in sequence: continuous casting, heating, descaling, rough rolling, shearing, heat preservation, heating or cooling, descaling, finish rolling, laminar cooling, shearing and coiling. The method comprises the following specific steps:
as shown in figure 3, firstly, a continuous casting blank (continuous casting) is cast by a continuous casting machine 1, the continuous casting blank is continuously kept warm by a first heat preservation cover 17, and is heated (heated) by a roller-hearth heating furnace 4, a first descaling device 5 removes primary surface scale (descaling), a roughing mill unit 6 rolls under high reduction and then becomes an intermediate blank (roughing), the intermediate blank is cut (sheared) by a second shearing machine 7 according to the size of a single steel coil or a plurality of steel coils, the cut single intermediate blank is kept warm (heat preservation) by a second heat preservation cover 18, the induction heating furnace 10 quickly supplements heat or is cooled (heated or cooled) by a first cooling device 11, the secondary surface scale (descaling) is removed by the second descaling device 12, the cut single intermediate blank enters a finishing mill unit 13 for rolling to obtain a hot rolled finished strip steel (finished product), the hot rolled strip steel (finished product) is cooled (laminar cooling) by a laminar cooling system, and is coiled (sheared and coiled) by a high-speed flying shear 15 and underground coiler 16 .
In the whole production process, the first shearing machine 2, the first stack plate pushing device 3, the second stack plate pushing device 8 and the hub shearing machine 9 are not thrown in, the continuous casting billet before the high-speed flying shear 15 is disconnected with the intermediate billet, and the intermediate billet is continuous with the hot rolled strip steel, so that the production mode is called a semi-endless rolling production mode.
3. The medium plate production method based on the production unit is used for producing medium plates with the finished product thickness of 10 mm-20 mm when the finishing mill unit 13 breaks down. The method comprises the following steps which are carried out in sequence: continuous casting, heating, descaling, rough rolling, shearing and pushing out of line. The method comprises the following specific steps:
as shown in fig. 4, firstly, a continuous casting blank (continuous casting) is cast by a continuous casting machine 1, the continuous casting blank is continuously subjected to heat preservation by a first heat preservation cover 17 and heat supplement (heating) by a roller-hearth heating furnace 4, primary oxidized iron scales (descaling) on the surface are removed by a first descaling device 5, the rough rolling mill unit 6 is subjected to high-reduction rolling and then becomes an intermediate blank (rough rolling), the intermediate blank is cut (sheared) by a second shearing machine 7 according to the preset length size of a medium plate, and the lower line is pushed out (pushed out and lowered) by a second stack plate pushing device 8.
In the whole production process, the first shearing machine 2, the first push-out stacking plate device 3, the second heat-preservation cover 18, the rotary hub shear 9, the induction heating furnace 10, the first cooling device 11, the second descaling device 12, the finishing mill group 13, the second cooling device 14, the high-speed flying shear 15 and the coiler are not put into use, and the thickness of the intermediate billet is just within the thickness range of the medium plate, so that the production mode of the medium plate is called as a production mode of the medium plate.
4. A continuous casting billet production method based on the production unit is used for producing a continuous casting billet with the thickness of 70 mm-110 mm when the roughing mill unit 6 breaks down. The method comprises the following steps which are carried out in sequence: continuous casting, shearing and pushing out the lower wire. The method specifically comprises the following steps: as shown in fig. 5, the continuous casting slab cast by the continuous casting machine 1 is sheared by the first shearing machine 2, and then is pushed out of the production line by the first push-out stacking plate device 3. In the whole production process, the equipment behind the first push-out stacking device 3 is not put into use, and only a single continuous casting billet is produced, which is called a continuous casting billet production mode.
In the above production method of endless rolled strip steel and the production method of semi endless rolled strip steel, various production processes can be adopted:
1. the intermediate blank is subjected to heat supplementing to 1030-1080 ℃ by adopting an induction heating furnace 10, the first cooling device 11 is not used at the moment, the finish rolling temperature is 880-930 ℃ after the intermediate blank is rolled by a finishing mill group 13, and the recrystallization type controlled rolling and cooling process is realized.
2. The intermediate blank is subjected to complementary heating to 980-1020 ℃ by using an induction heating furnace 10, the first cooling device 11 is not used, the finish rolling temperature is 840-880 ℃ after the intermediate blank is rolled by a finishing mill unit 13, and the thermomechanical rolling process is realized.
3. The intermediate blank is cooled to 830-860 ℃ by adopting a first cooling device 11, the induction heating furnace 10 is not used at the moment, and the finish rolling temperature is 750-810 ℃ after the intermediate blank is rolled by a finishing mill group 13, so that the ferrite rolling process is realized.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1. The multifunctional hot-rolled plate strip production unit is characterized by comprising a continuous casting machine, a first shearing machine, a first stack plate pushing device, a first heating device, a first descaling device, a roughing mill set, a second heating device, a first cooling device, a second descaling device, a finishing mill set, a second cooling device, a third shearing machine and an underground coiler which are sequentially arranged along a rolling line.
2. The production train according to claim 1, wherein a second shear and a second push-out pack device are arranged in succession in the rolling direction between the roughing train and the second heating device.
3. The production assembly according to claim 2, wherein a fourth shear is present between the second ejection stacking means and the second heating means.
4. The production assembly according to claim 3, characterized in that a first heat-insulating cover is arranged at the first ejection stacking device and a second heat-insulating cover is arranged at the second ejection stacking device.
5. The production assembly of claim 3, wherein the first and second shears are pendulum shears, the third shear is a high speed flying shear, and the fourth shear is a rotary hub shear; the first heating device is a roller hearth type heating furnace, and the second heating device is an induction heating furnace.
6. A production method of endless rolled steel strip based on the production line of claim 4, characterized in that the method comprises the following steps in sequence: continuous casting, heating, descaling, rough rolling, heat preservation, heating or cooling, descaling, finish rolling, laminar cooling, shearing and coiling.
7. A method for producing a semi-endless rolled steel strip based on the production assembly of claim 4, characterized in that it comprises the following steps carried out in sequence: continuous casting, heating, descaling, rough rolling, shearing, heat preservation, heating or cooling, descaling, finish rolling, laminar cooling, shearing and coiling.
8. The production method according to claim 6 or 7, wherein any one of a recrystallization type controlled rolling and controlled cooling process, a thermomechanical rolling process, and a ferrite rolling process is used,
when a recrystallization type controlled rolling and controlled cooling process is adopted, the inlet temperature of finish rolling is 1030-1080 ℃, and the finish rolling temperature of the finish rolling is 880-930 ℃;
when a thermomechanical rolling process is adopted, the finish rolling inlet temperature is 980-1020 ℃, and the finish rolling temperature is 840-880 ℃;
when a ferrite rolling process is adopted, the finish rolling inlet temperature is 830-860 ℃, and the finish rolling temperature is 750-810 ℃.
9. A method for producing medium plates based on a production assembly according to claim 4, characterized in that it comprises the following steps carried out in sequence: continuous casting, heating, descaling, rough rolling, shearing and pushing out of line.
10. A continuous casting slab production method based on the production unit of claim 4, characterized by comprising the following steps performed in sequence: continuous casting, shearing and pushing out the lower wire.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115716086A (en) * | 2022-12-09 | 2023-02-28 | 中冶南方工程技术有限公司 | Hot-rolled ultrathin strip steel endless continuous casting and rolling production unit and production method thereof |
| WO2024036711A1 (en) * | 2022-08-19 | 2024-02-22 | 中冶南方工程技术有限公司 | Multifunctional high-strength steel sheet or strip heat treatment production system and method |
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| CN115716086B (en) * | 2022-12-09 | 2023-11-21 | 中冶南方工程技术有限公司 | Continuous casting and rolling production unit and method for hot-rolled ultrathin strip steel |
| WO2024120207A1 (en) * | 2022-12-09 | 2024-06-13 | 中冶南方工程技术有限公司 | Endless continuous casting and rolling production unit and production method for hot-rolled ultra-thin strip steel |
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