CN109433826B - Medium-thin slab continuous casting and rolling unit and production method thereof - Google Patents
Medium-thin slab continuous casting and rolling unit and production method thereof Download PDFInfo
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- CN109433826B CN109433826B CN201811395644.XA CN201811395644A CN109433826B CN 109433826 B CN109433826 B CN 109433826B CN 201811395644 A CN201811395644 A CN 201811395644A CN 109433826 B CN109433826 B CN 109433826B
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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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/002—Piling, unpiling, unscrambling
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Abstract
The invention relates to a continuous casting and rolling unit for medium thin slabs, which comprises a continuous casting machine, a roughing mill, a medium rolling unit, a finishing mill unit, a strip steel cooling device, a flying shear and a coiling machine which are sequentially connected, wherein buffer mechanisms are arranged between the roughing mill and the medium rolling mill unit and between the medium rolling mill unit and the finishing mill unit, and each buffer mechanism comprises a shearing machine and a push stacking device. In addition, the production method of the medium sheet billet continuous casting and rolling unit is also related to the selection and switching of production modes according to the running condition of equipment, including a headless rolling production mode, a quarter production mode, a half production mode and a three-quarter production mode. The three-section arrangement mode of the roughing mill, the middle rolling mill group and the finishing mill group is adopted, the production process is easy to control, the load of the finishing mill group is reduced, and the product performance control is facilitated. The double buffer sections can improve the flexibility between the continuous casting section and the rolling section, increase the buffer time of accident handling, and greatly improve the production operation flexibility of the whole unit.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a medium-thin slab continuous casting and rolling unit and a production method thereof.
Background
The sheet bar continuous casting and rolling technology has been developed for nearly 30 years, and has undergone a single-billet rolling stage and a semi-endless rolling stage, and has been developed to an endless rolling stage. The endless rolling of the hot rolled strip steel means that a continuous casting machine continuously casts a continuous casting blank in a casting period, and the continuous casting blank is coiled in a split way after being directly subjected to main working procedures such as heating, descaling, rolling, laminar cooling and the like; the continuous casting is carried out from continuous casting blank to strip steel coiling and shearing in the whole production process, and rolled pieces are not sheared, so that the continuous casting is called endless rolling.
At present, the endless rolling technology of hot rolled strip steel which is more applied at home and abroad is the Prite ESP technology, and the unit arrangement mainly comprises: continuous casting machine, three-frame rough rolling unit, swing shearing, pushing out and stacking plate device/heat preservation cover, rotating hub shearing, induction heating furnace, high-pressure water descaling machine, five-frame finishing mill unit, laminar cooling system, high-speed flying shearing and underground coiling machine. Compared with the traditional sheet billet 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 practical production, some problems are encountered, mainly that the rigidity of an ESP production line is too strong, especially the equipment arrangement between a continuous casting section and a rolling section is very compact, two procedures of continuous casting and rolling are required to be closely matched, the requirement on production organization management is very high, the production flexibility is poor, and once a unit breaks down, the buffering time is short and the accident handling is difficult.
Disclosure of Invention
The embodiment of the invention relates to a medium thin slab continuous casting and rolling unit and a production method thereof, which at least can solve part of defects in the prior art.
The embodiment of the invention relates to a continuous casting and rolling unit for medium thin slabs, which comprises a continuous casting machine, a roughing mill, a medium rolling unit, a finishing mill unit, a strip steel cooling device, a flying shear and a coiling machine which are sequentially connected, wherein buffer mechanisms are arranged between the roughing mill and the medium rolling unit and between the medium rolling unit and the finishing mill unit, and each buffer mechanism comprises a shearing machine and a push type stacking device.
As one of the embodiments, a vertical rolling mill is further disposed between the continuous casting machine and the roughing mill.
As one embodiment, heat preservation covers are arranged at the two pushing type stacking devices respectively.
As one of the embodiments, heating devices and descaling devices are arranged between the front-pass push type stacking device and the middle rolling mill group and between the rear-pass push type stacking device and the finishing mill group.
As one embodiment, the middle rolling unit and the finishing rolling unit are four-high rolling mill, the number of frames of the middle rolling unit is 2-3, and the number of frames of the finishing rolling unit is 4-6.
The embodiment of the invention also relates to a production method of the medium sheet billet continuous casting and rolling unit, which selects and switches production modes according to the running condition of equipment, and specifically comprises the following steps:
when the equipment has no faults, carrying out a headless rolling production mode, and carrying out cooling, flying shear shearing and coiling after continuous casting blanks produced by a continuous casting machine pass through the roughing mill, the intermediate rolling mill and the finishing mill in sequence;
when the roughing mill fails, a quarter production mode is carried out, and continuous production is carried out only on a continuous casting machine; cutting off the rolled piece by adopting a front-way cutting machine, carrying out offline treatment on the rolled piece in front of the front-way cutting machine by using a front-way push stacking device, and sequentially carrying out subsequent treatment on the rolled piece behind the front-way cutting machine;
when the middle rolling mill group fails, a half production mode is carried out, and continuous production is only formed between the continuous casting machine and the roughing mill; cutting off the rolled piece at the corresponding position by adopting two shearing machines, rolling the rolled piece in front of the front shearing machine by the roughing mill, continuously shearing the rolled piece to a fixed length by the front shearing machine, and then performing off-line treatment by a front push type stacking device; for rolled pieces between two shearing machines, continuously shearing the rolled pieces to a fixed length by a back shearing machine, and then carrying out off-line treatment by a back push type stacking device; sequentially carrying out subsequent treatment on rolled pieces after a subsequent shearing machine;
when the finishing mill group fails, a three-quarter production mode is carried out, and continuous production is only formed between the continuous casting machine and the middle rolling mill group; and cutting off the rolled piece by adopting a back-pass shearing machine, rolling the rolled piece before the back-pass shearing machine by sequentially passing through the roughing mill and the middle rolling mill group, continuously shearing the rolled piece to a fixed length by the back-pass shearing machine, performing off-line treatment by using a back-pass push stacking device, and sequentially performing subsequent treatment on the rolled piece after the back-pass shearing machine.
As one of the embodiments, in the endless rolling production mode, the continuous casting machine has a billet drawing speed of 4-7 m/min, a continuous casting billet width of 1300-1600 mm, a continuous casting billet thickness of 70-120 mm, a rolled piece thickness of 30-50 mm after being rolled by the roughing mill, a rolled piece thickness of 10-20 mm after being rolled by the intermediate rolling mill set, and a finished strip steel thickness of 0.8-4 mm after being rolled by the finishing mill set.
As one example, in the endless rolling production mode, the rough rolling inlet temperature is controlled to 1150-1200 ℃, the intermediate rolling inlet temperature is controlled to 1100-1150 ℃ and the intermediate rolling finishing temperature is controlled to 1030-1080 ℃, the finish rolling inlet temperature is controlled to 1030-1080 ℃ and the finish rolling finishing temperature is controlled to 830-880 ℃, and the coiling temperature is controlled to 560-640 ℃.
As one of the embodiments, in the endless rolling production mode, the rolling reduction of the roughing mill is controlled to be 45-60%, and the rolling pressure per unit width is controlled to be 16-18 KN/mm; controlling the total rolling reduction of the intermediate rolling mill set to be 55-80%, and controlling the rolling pressure of the unit width to be 13-16 KN/mm; controlling the total rolling reduction of the finishing mill group to be 80-95% and the rolling pressure of the unit width to be 7-18 KN/mm.
In one embodiment, in the three-quarter production mode, for the rolled piece after the post shearing machine, when the distance between the tail of the finished strip steel section and the inlet of the flying shear reaches a set threshold value, the rolled piece at the corresponding position of the flying shear is sheared, the finished strip steel after the flying shear is coiled, and the rolled piece before the flying shear is hoisted away by a crane.
The embodiment of the invention has at least the following beneficial effects:
the continuous casting and rolling unit for the middle sheet billet provided by the invention adopts a three-section arrangement mode of a roughing mill, a middle rolling mill group and a finishing mill group, and is suitable for rolling the middle sheet billet with the thickness of 70-120 mm into a thin-specification finished strip steel. In the process of endless rolling production, on one hand, the high-temperature characteristics of good plasticity and low deformation resistance of the continuous casting blank are utilized, a roughing mill is adopted to rapidly carry out single-pass large-reduction rolling on a thicker continuous casting blank, a blank plate which is as thin as possible can be obtained under the condition of meeting the biting condition, and then the larger-reduction rolling is further carried out on a middle rolling mill group to obtain a middle blank which is as thin as possible, so that the load of a finishing mill group is reduced, and the thickness and the shape of a thin product are favorably controlled by a finishing mill section; on the other hand, the rolling sections are separated, so that the slab and the intermediate slab have enough recrystallization and various second phase precipitation time, and the product performance control is facilitated.
The shearing machines and the push stacking devices are distributed between the roughing mill and the middle rolling mill set and between the middle rolling mill set and the finishing mill set, so that buffer sections are respectively formed between the roughing mill and the middle rolling mill set and between the middle rolling mill set and the finishing mill set, when accidents occur in the later working procedures, the shearing machines shear the slabs or the intermediate slabs, the front working procedure and the later working procedure are disconnected, and the slabs or the intermediate slabs are moved out of the rolling line by the pushing and stacking device, so that the purposes of buffer and coordinated production are achieved. Compared with a single buffer section, the double buffer section can further improve the flexibility between the continuous casting section and the rolling section, especially when the finishing mill group breaks down, the buffer time for accident handling is increased, and therefore the production operation flexibility of the whole mill group is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a continuous casting and rolling unit for medium thin slabs according to a first embodiment of the present invention;
fig. 2 is a process schematic diagram of a headless rolling production mode according to a second embodiment of the present invention;
FIG. 3 is a schematic process diagram of a quarter-production mode according to a second embodiment of the present invention;
FIG. 4 is a schematic process diagram of a second embodiment of the present invention;
FIG. 5 is a schematic process diagram of a three-quarter production mode according to a second embodiment of the present invention;
FIG. 6 is a schematic view of a process for shearing a product after a post-shear in a three-quarter production mode according to a second embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a continuous casting and rolling unit for medium thin slabs, which comprises a continuous casting machine 1, a roughing mill 3, a medium rolling mill group 9, a finishing mill group 10, a strip steel cooling device 11, a flying shear 12 and a coiling machine 13, wherein buffer mechanisms are respectively arranged between the roughing mill 3 and the medium rolling mill group 9 and between the medium rolling mill group 9 and the finishing mill group 10, and each buffer mechanism comprises a shearing machine 4 and a push stacking device 6.
In the following description of the embodiment, the rolling stock between the continuous casting machine 1 and the roughing mill 3 is defined as a continuous casting slab 101, the rolling stock between the roughing mill 3 and the end frame of the middle rolling train 9 is defined as a slab 102, the rolling stock between the end frame of the middle rolling train 9 and the end frame of the finishing train 10 is defined as an intermediate slab 103, and the rolling stock after the end frame of the finishing train 10 is defined as a hot rolled strip 104, according to the location of the rolling stock (i.e., thickness).
The continuous casting machine 1 is preferably a straight arc continuous casting machine 1, and compared with a vertical bending continuous casting machine, the metallurgical length of the straight arc continuous casting machine 1 is longer, the vertical section of the straight arc continuous casting machine is beneficial to floating inclusion in molten steel, the internal cleanliness of a continuous casting blank 101 is improved, the internal quality of a slab 102 is improved, the height of a pouring platform can be obviously reduced, and the bulging deformation of the continuous casting blank 101 is reduced, so that the continuous casting machine is more suitable for casting thicker continuous casting blanks 101 at a larger blank drawing speed.
The roughing mill 3 is preferably a two-high mill, and the diameter of the working rolls of the two-high mill is larger than that of the four-high mill, so that the thicker continuous casting billet 101 can be smoothly bitten into the working rolls.
The above-mentioned intermediate rolling mill group 9 and finishing mill group 10 are preferably four-high rolling mill, and the four-high rolling mill has smaller roll diameter and larger rigidity compared with the two-high rolling mill, which is advantageous for reducing rolling pressure, reducing rolling energy consumption, and rolling thin gauge strip steel. In the embodiment, the number of the frames of the middle rolling mill group 9 is 2-3, and the number of the frames of the finishing mill group 10 is 4-6, so that the rolling requirement of thin strip steel can be met; as a further preferred embodiment, a combination of a double stand mill train 9 and a five stand finishing mill train 10 is used, and the rolling effect is good.
The shearing machine 4 may be a shearing machine conventional in the art, and the pushing stacking device 6 may be a pushing and stacking device conventional in the art, and the specific structure of the pushing and stacking device and the pushing and stacking device will not be described herein.
The above-mentioned strip cooling device 11 is used for heat treatment of the hot rolled strip 104, and water cooling and air cooling are performed according to the process requirements, so as to obtain the ideal microstructure and mechanical properties of the finished strip, and the strip laminar cooling device can be adopted, and the specific structure is omitted here.
The flying shears 12 are typically high-speed flying shears 12 for separating and shearing the hot rolled strip 104 to obtain the required coil weight. The coiler 13 is preferably an underground coiler 13 for coiling the split hot-rolled strip 104; in this embodiment, the method includes 3 down reels 13, only two of which are used in normal production, the coiled strip steel is coiled alternately, the other is standby, and when one of the reels 13 fails, the coiling is switched to the standby reels 13 for coiling, so as to ensure continuous production.
The continuous casting and rolling unit for the middle sheet billet provided by the embodiment adopts a three-section arrangement mode of 'roughing mill 3+middle mill group 9+finishing mill group 10', and is suitable for rolling the middle sheet billet with the thickness of 70-120 mm into a thin-specification finished strip steel. In the process of endless rolling production, on one hand, by utilizing the high-temperature characteristics of good plasticity and low deformation resistance of the continuous casting blank 101, the roughing mill 3 is adopted to rapidly roll the thicker continuous casting blank 101 in a single pass with large rolling reduction, so that a slab 102 which is as thin as possible can be obtained under the condition of meeting the biting condition, and then the intermediate rolling mill group 9 is further subjected to rolling with large rolling reduction so as to obtain an intermediate blank 103 which is as thin as possible, thereby reducing the load of the finishing mill group 10 and being beneficial to controlling the thickness and the shape of a thin product in the finishing mill section; on the other hand, the rolling sections are separated, so that the slab 102 and the intermediate slab 103 have enough recrystallization and various second phase precipitation time, and the product performance control is facilitated.
In the continuous casting and rolling unit for middle sheet billet provided in this embodiment, the shearing machine 4 and the push stacking device 6 are disposed between the roughing mill 3 and the middle rolling mill group 9 and between the middle rolling mill group 9 and the finishing mill group 10, so that buffer sections are respectively formed between the roughing mill 3 and the middle rolling mill group 9 and between the middle rolling mill group 9 and the finishing mill group 10, when an accident occurs in the subsequent process, the shearing machine 4 shears the sheet billet 102 or the intermediate billet 103, so that the previous and subsequent processes are disconnected, and then the sheet billet 102 or the intermediate billet 103 is moved out of the rolling line by the push-out and stacking device, thereby achieving the purposes of buffering and coordinated production. Compared with a single buffer section, the double buffer section can further improve the flexibility between the continuous casting section and the rolling section, especially when the finishing mill group 10 breaks down, the buffer time for accident handling is increased, and thus the production operation flexibility of the whole mill group is greatly improved.
Further preferably, as shown in fig. 1, a vertical rolling mill 2 is further disposed between the continuous casting machine 1 and the roughing mill 3, and its functions include: (1) precisely adjusting the width of the continuous casting billet 101; (2) Rolling a wedge-shaped blank generated in the online width adjustment process of a crystallizer of the continuous casting machine 1 into a regular normal blank, and improving the metal yield; (3) Improving the edge structure of the casting blank, promoting the recrystallization of the edge structure, improving the mechanical property of the edge and reducing edge cracks in the rough rolling process; (4) Can be used as a guiding device, and is beneficial to feeding the casting blank into the roughing mill 3. It can be seen that arranging the vertical roller mill 2 can effectively improve the production efficiency of the unit and the performance of the strip steel products.
Further preferably, as shown in fig. 1, heat-insulating covers 5 are arranged at the two pushing-type stacking devices 6, and the heat-insulating covers 5 are used for insulating the continuous casting billets 101 during endless rolling so as to reduce temperature drop and energy consumption.
Further preferably, as shown in fig. 1, heating means 7 and descaling means 8 are arranged between the front push stacker 6 and the middle rolling mill train 9 and between the rear push stacker 6 and the finishing mill train 10. Due to the adoption of the two sections of buffer sections, the slab 102 may have a larger temperature drop (about 100 ℃) after passing through the front section of buffer section and the intermediate slab 103 after passing through the rear section of buffer section, and the heating device 7 is arranged, so that the rolled piece can be rapidly subjected to heat compensation, and the requirement of medium rolling or finish rolling temperature can be met. The heating device 7 is preferably an induction heating furnace, and compared with a conventional roller hearth type heating furnace, the induction heating furnace has the following advantages: (1) The heating efficiency is higher, and the electrothermal conversion efficiency reaches 65% -70%; (2) The rolled piece can reach the preset temperature in a shorter heating time, so that the oxidation burning loss is less, the furnace length is short, and the occupied area is small. The front section descaling device 81 is used for removing primary iron scales with the surface viscosity of the slab 102 and preventing the iron scales from being pressed in during middle rolling, and the front section descaling device 81 is preferably a rotary descaling machine, so that the primary iron scales are removed better. The rear-stage descaling device 82 is used for removing secondary iron scales on the surface of the intermediate billet 103 and preventing the iron scales from being pressed in during finish rolling; the rear scale removing device 82 preferably adopts a high-pressure water scale remover, and has better effect of removing the secondary scale.
It will be readily appreciated that in the description of the orientations of "front" and "rear" in this embodiment, "front" refers to the side of the rear apparatus that is closer to the continuous casting machine 1 in the direction of travel of the product.
Example two
The present embodiment mainly describes a production method of the continuous casting and rolling train for medium thin slabs provided in the first embodiment.
As shown in fig. 2 to 6, the production method of the medium thin slab continuous casting and rolling unit comprises the following steps: and selecting and switching production modes according to the running condition of the equipment. The method specifically comprises the following steps:
(1) And when the equipment has no faults, a headless rolling production mode is carried out, and after the continuous casting billet 101 produced by the continuous casting machine 1 is rolled by the roughing mill 3, the intermediate rolling mill group 9 and the finishing mill group 10 in sequence, cooling, shearing by the flying shears 12 and coiling are carried out. In the production mode, the two shearing machines 4 and the two pushing type stacking devices 6 are not put into production, the two heat preservation covers 5 are put into operation, and the whole unit is continuously produced.
Specifically, as shown in fig. 2, a continuous casting billet 101 is cast by a continuous casting machine 1, the continuous casting billet 101 is subjected to edge rolling by a vertical rolling mill 2 and high reduction rolling by a roughing mill 3, and then is changed into a slab 102, the slab 102 is subjected to heat preservation by a front heat preservation cover 51, then enters a front heating device 71 for rapid heat compensation, then is subjected to front descaling device 81 to remove iron scales on the surface of the slab 102, then enters a middle rolling mill group 9 for rolling and then is changed into an intermediate billet 103, and likewise, the intermediate billet 103 is subjected to heat preservation by a rear heat preservation cover 52 continuously, enters a rear heating device 72 for rapid heat compensation, then is subjected to finish rolling by a rear descaling device 82 to remove iron scales on the surface of the intermediate billet 103, then enters a finishing mill group 10 for rolling, and then the hot rolled strip 104 is subjected to heat treatment, split shearing and coiling in sequence by a strip cooling device 11, a high-speed flying shear 12 and a down coiler 13. In the whole production process, the continuous casting billet 101, the slab 102, the intermediate billet 103 and the hot rolled strip steel 104 before the high-speed flying shear 12 are continuous and have no break, so that endless rolling production is realized.
(2) When the roughing mill 3 fails, a quarter production mode is performed, and continuous production is performed only on the continuous casting machine 1. The rolled product is sheared by the front shearing machine 41, the rolled product before the front shearing machine 41 is processed by the front pushing type stacking device 61 in a down-line mode, and the rolled product after the front shearing machine 41 is sequentially processed in a follow-up mode. In this production mode, the front shears 41 and the front push stacker 61 are put into operation, the front heat-retaining cover 51 is not put into operation, the rear shears 42 and the rear push stacker 62 are not put into operation, and the rear heat-retaining cover 52 is put into operation.
Specifically, as shown in fig. 3, the roughing mill 3 is turned on, and neither the edger mill 2 nor the roughing mill 3 is put into production, while immediately shearing the slab 102 with the front pass shearing machine 41. Continuous casting, shearing and casting blank off-line operations are performed before the front-path shearing machine 41 until casting is completed or faults are eliminated; after the preceding shears 41, the slab 102 is sequentially heated, descaled, mid-rolled, held warm, heated, descaled, finish rolled, cooled, sheared and coiled until the portion of the slab 102 is fully produced.
(3) When the middle rolling mill group 9 fails, a half-production mode is performed, and continuous production is formed only between the continuous casting machine 1 and the roughing mill 3. Cutting off the rolled piece at the corresponding position by adopting two shears 4, rolling the rolled piece before the front shears 41 by the roughing mill 3, continuously cutting the rolled piece to a fixed length by the front shears 41, and then performing off-line treatment by a front push type stacking device 61; for the rolled piece between the two shears 4, the rolled piece is continuously cut to length by the back-pass shears 42 and then is subjected to off-line treatment by the back-pass push stacking device 62; the rolled stock after the subsequent shears 42 is sequentially subjected to subsequent processing. In this production mode, both the shears 4 and the push stacker 6 are put into operation, neither the heat-insulating covers 5 are put into operation, and neither the front-stage heating device 71 nor the front-stage descaling device 81 are put into operation. Specifically, as shown in fig. 4, the middle rolling mill group 9 rolls are opened, and immediately the slab 102 and the intermediate slab 103 are sheared by the front pass shearer 41 and the rear pass shearer 42, respectively.
Continuous casting, shearing and casting blank off-line operations are performed before the front-path shearing machine 41 until casting is completed or faults are eliminated;
cutting and off-line operation of the slab 102 is performed between the two shears 4 until the part of the slab 102 is completely moved out of the rolling line;
after the subsequent shears 42, the intermediate blank 103 is sequentially heated, descaled, finish rolled, cooled, sheared and coiled until the portion of the intermediate blank 103 is fully produced.
(4) When the finishing mill group 10 fails, a three-quarter production mode is performed, and continuous production is formed only between the continuous casting machine 1 and the intermediate mill group 9. The rolled piece is sheared by the post shearing machine 42, rolled pieces before the post shearing machine 42 are rolled by the roughing mill 3 and the middle rolling mill group 9 in sequence, cut to length continuously by the post shearing machine 42, then are processed in a line by the post push type stacking device 62, and rolled pieces after the post shearing machine 42 are processed in sequence. In this production mode, the rear shears 42, the rear push stacker 62 and the front heat-retaining cover 51 are put into operation, and the front shears 41, the front push stacker 61, the rear heat-retaining cover 52, the rear heater 72 and the rear descaling device 82 are not put into operation.
Specifically, as shown in fig. 5, the rolls of the finishing mill group 10 are opened while immediately shearing the intermediate billet 103 with the post-shearing machine 42;
before the subsequent shearing machine 42, continuous casting, vertical rolling, rough rolling, heat preservation, heating, descaling, intermediate rolling, shearing and intermediate billet 103 off-line operation are carried out until the casting is finished or faults are eliminated;
after the subsequent shears 42, cooling, shearing and coiling operations are performed.
Further preferably, as shown in fig. 6, since there is a part of the rolled product that has been finish rolled and a part that has not been finish rolled, in the three-quarter production mode, for the rolled product after the post-shears 42, there is an intermediate billet 103 section and a finished strip section that are joined to each other, and when the distance between the end of the finished strip section (i.e., the end of the finished strip section that is remote from the coiler 13, i.e., the transition region between the intermediate billet 103 section and the finished strip section) and the entrance of the flying shears 12 reaches the set threshold d, the rolled product at the corresponding position of the flying shears 12 is sheared, the finished strip after the flying shears 12 is coiled, and the rolled product before the flying shears 12 is lifted away by a crane. Preferably, the set threshold d is 1-4 m, and is preferably controlled to be about 3m, so that the quality of coiled finished strip steel can be ensured.
It will be readily appreciated that for the quarter production mode, the half production mode and the three-quarter production mode described above, when the fault is eliminated, the rolling operation is switched to the endless rolling production mode.
Further optimizing the production method, in the headless rolling production mode, the billet drawing speed of the continuous casting machine 1 is 4-7 m/min, the width of the continuous casting billet 101 is 1300-1600 mm, the thickness of the continuous casting billet 101 is 70-120 mm, the thickness of a rolled piece after being rolled by the roughing mill 3 is 30-50 mm, the thickness of the rolled piece after being rolled by the intermediate rolling mill 9 is 10-20 mm, and the thickness of a finished strip steel after being rolled by the finishing mill 10 is 0.8-4 mm.
Further preferably, in the endless rolling production mode, the rough rolling inlet temperature is controlled to 1150-1200 ℃, the intermediate rolling inlet temperature is controlled to 1100-1150 ℃ and the intermediate rolling finishing temperature is controlled to 1030-1080 ℃, the finish rolling inlet temperature is controlled to 1030-1080 ℃ and the finish rolling finishing temperature is controlled to 830-880 ℃, and the coiling temperature is controlled to 560-640 ℃.
Further preferably, in the endless rolling production mode, the rolling reduction of the roughing mill 3 is controlled to be 45-60%, and the rolling pressure per unit width is controlled to be 16-18 KN/mm; controlling the total rolling reduction of the middle rolling mill group 9 to be 55-80%, and controlling the rolling pressure of unit width to be 13-16 KN/mm; the total rolling reduction of the finishing mill group 10 is controlled to be 80-95%, and the rolling pressure per unit width is controlled to be 7-18 KN/mm.
Under the control of the production process parameters, the quality of the finished hot rolled strip steel 104 can be improved, and the cold rolled strip steel with low requirements on the surface quality, such as container plates, pickling plates for automobiles, container plates, galvanized plates and the like, can be replaced by hot cold.
Example III
This example further describes the endless rolling production method in the second example described above, taking as an example the production of hot rolled carbon steel having a finished thickness of 0.8mm and a width of 1600 mm.
The endless rolling production mode is used for continuous production in the whole unit under the fault-free production condition, and mainly comprises the following steps: continuous casting, vertical rolling, rough rolling, heating, descaling, intermediate rolling, heating, descaling, finish rolling, laminar cooling, shearing and coiling. The main technological parameters are as follows:
continuous casting: the thickness of the continuous casting blank 101 is 80mm, the width of the continuous casting blank 101 is 1600mm, and the drawing speed is 6m/min.
Rough rolling: the reduction rate of the roughing mill 3 is 50%, the thickness of the plate blank 102 after roughing is 40mm, the rolling pressure per unit width is 17.6KN/mm, and the roughing inlet temperature is 1170-1190 ℃.
And (3) middle rolling: the total rolling reduction of the intermediate rolling mill group 9 is 75%, the thickness of the intermediate blank 103 after intermediate rolling is 10mm, the rolling pressure per unit width is 14.5-15.5 KN/mm, the intermediate rolling inlet temperature is 1120-1140 ℃, and the intermediate rolling finishing temperature is 1040-1060 ℃.
Finish rolling: the total rolling reduction of the finishing mill group 10 is 92%, the thickness of the hot rolled strip steel 104 after finish rolling is 0.8mm, the rolling pressure per unit width is 9-17.4 KN/mm, the finish rolling inlet temperature is 1050-1070 ℃, and the finish rolling finishing temperature is 850-870 ℃.
And (3) coiling: the coiling temperature is 590-610 ℃.
The longitudinal thickness deviation of the finished carbon steel strip with the thickness of 0.8mm obtained by the method is less than or equal to 22 mu m, the flatness deviation is less than or equal to 20I, the width convexity deviation C40 is less than or equal to 16 mu m, and the method can replace cold-rolled strip steel with low surface quality requirements, such as container plates, pickling plates for automobiles, container plates, galvanized plates and the like, so that the effect of replacing cold with heat is realized.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. A medium-thin slab continuous casting and rolling unit is characterized in that: the continuous casting machine comprises a continuous casting machine, a roughing mill, a middle rolling unit, a finishing mill unit, a strip steel cooling device, flying shears and a coiling machine which are sequentially connected, wherein buffer mechanisms are arranged between the roughing mill and the middle rolling unit and between the middle rolling unit and the finishing mill unit, and each buffer mechanism comprises a shearing machine and a push stacking device;
when the equipment has no faults, the unit is used for executing a headless rolling production mode, and after the continuous casting billet produced by the continuous casting machine is rolled by the roughing mill, the intermediate rolling unit and the finishing mill in sequence, cooling, flying shear shearing and coiling are carried out;
when the roughing mill fails, the unit is used for executing a quarter production mode and continuous production is only carried out on the continuous casting machine; cutting off the rolled piece by adopting a front-way cutting machine, carrying out offline treatment on the rolled piece in front of the front-way cutting machine by using a front-way push stacking device, and sequentially carrying out subsequent treatment on the rolled piece behind the front-way cutting machine;
when the middle rolling mill group breaks down, the group is used for executing a half production mode, and continuous production is only formed between the continuous casting machine and the roughing mill; cutting off the rolled piece at the corresponding position by adopting two shearing machines, rolling the rolled piece in front of the front shearing machine by the roughing mill, continuously shearing the rolled piece to a fixed length by the front shearing machine, and then performing off-line treatment by a front push type stacking device; for rolled pieces between two shearing machines, continuously shearing the rolled pieces to a fixed length by a back shearing machine, and then carrying out off-line treatment by a back push type stacking device; sequentially carrying out subsequent treatment on rolled pieces after a subsequent shearing machine;
when the finishing mill group breaks down, the group is used for executing a three-quarter production mode, and continuous production is only formed between the continuous casting machine and the middle rolling mill group; and cutting off the rolled piece by adopting a back-pass shearing machine, rolling the rolled piece before the back-pass shearing machine by sequentially passing through the roughing mill and the middle rolling mill group, continuously shearing the rolled piece to a fixed length by the back-pass shearing machine, performing off-line treatment by using a back-pass push stacking device, and sequentially performing subsequent treatment on the rolled piece after the back-pass shearing machine.
2. The medium thin slab continuous casting and rolling train as claimed in claim 1, wherein: and a vertical roller mill is also arranged between the continuous casting machine and the roughing mill.
3. The medium thin slab continuous casting and rolling train as claimed in claim 1, wherein: and heat preservation covers are arranged at the two pushing type stacking devices.
4. The medium thin slab continuous casting and rolling train as claimed in claim 1, wherein: and heating devices and descaling devices are distributed between the front pushing type stacking device and the middle rolling mill group and between the rear pushing type stacking device and the finishing mill group.
5. The medium thin slab continuous casting and rolling train as claimed in claim 1, wherein: the middle rolling unit and the finishing mill unit are four-high rolling mill, the number of frames of the middle rolling unit is 2-3, and the number of frames of the finishing mill unit is 4-6.
6. The production method of the medium thin slab continuous casting and rolling train according to any one of claims 1 to 5, characterized in that the selection and switching of the production modes are performed according to the operation conditions of the equipment, and specifically comprises the following steps:
when the equipment has no faults, carrying out a headless rolling production mode, and carrying out cooling, flying shear shearing and coiling after continuous casting blanks produced by a continuous casting machine pass through the roughing mill, the intermediate rolling mill and the finishing mill in sequence;
when the roughing mill fails, a quarter production mode is carried out, and continuous production is carried out only on a continuous casting machine; cutting off the rolled piece by adopting a front-way cutting machine, carrying out offline treatment on the rolled piece in front of the front-way cutting machine by using a front-way push stacking device, and sequentially carrying out subsequent treatment on the rolled piece behind the front-way cutting machine;
when the middle rolling mill group fails, a half production mode is carried out, and continuous production is only formed between the continuous casting machine and the roughing mill; cutting off the rolled piece at the corresponding position by adopting two shearing machines, rolling the rolled piece in front of the front shearing machine by the roughing mill, continuously shearing the rolled piece to a fixed length by the front shearing machine, and then performing off-line treatment by a front push type stacking device; for rolled pieces between two shearing machines, continuously shearing the rolled pieces to a fixed length by a back shearing machine, and then carrying out off-line treatment by a back push type stacking device; sequentially carrying out subsequent treatment on rolled pieces after a subsequent shearing machine;
when the finishing mill group fails, a three-quarter production mode is carried out, and continuous production is only formed between the continuous casting machine and the middle rolling mill group; and cutting off the rolled piece by adopting a back-pass shearing machine, rolling the rolled piece before the back-pass shearing machine by sequentially passing through the roughing mill and the middle rolling mill group, continuously shearing the rolled piece to a fixed length by the back-pass shearing machine, performing off-line treatment by using a back-pass push stacking device, and sequentially performing subsequent treatment on the rolled piece after the back-pass shearing machine.
7. The method of claim 6, wherein: in the headless rolling production mode, the continuous casting machine has a blank pulling speed of 4-7 m/min, a continuous casting blank width of 1300-1600 mm, a continuous casting blank thickness of 70-120 mm, a rolled piece thickness of 30-50 mm after being rolled by the roughing mill, a rolled piece thickness of 10-20 mm after being rolled by the middle rolling mill group, and a finished strip steel thickness of 0.8-4 mm after being rolled by the finishing mill group.
8. The method of claim 6, wherein: in the endless rolling production mode, the rough rolling inlet temperature is controlled to 1150-1200 ℃, the intermediate rolling inlet temperature is controlled to 1100-1150 ℃ and the intermediate rolling finishing temperature is controlled to 1030-1080 ℃, the finish rolling inlet temperature is controlled to 1030-1080 ℃ and the finish rolling finishing temperature is controlled to 830-880 ℃, and the coiling temperature is controlled to 560-640 ℃.
9. The method of claim 6, wherein: in the headless rolling production mode, controlling the rolling reduction of the roughing mill to be 45-60% and the rolling pressure of unit width to be 16-18 KN/mm; controlling the total rolling reduction of the intermediate rolling mill set to be 55-80%, and controlling the rolling pressure of the unit width to be 13-16 KN/mm; controlling the total rolling reduction of the finishing mill group to be 80-95% and the rolling pressure of the unit width to be 7-18 KN/mm.
10. The method of claim 6, wherein: in the three-quarter production mode, when the distance between the tail of the finished product strip steel section of the rolled piece after the back shearing machine and the inlet of the flying shear reaches a set threshold value, the rolled piece at the corresponding position of the flying shear is sheared, the finished product strip steel after the flying shear is coiled, and the rolled piece before the flying shear is hoisted away by a crane.
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| CN110052495A (en) * | 2019-04-24 | 2019-07-26 | 中冶赛迪工程技术股份有限公司 | A kind of long material endless rolling production line of short route and its milling method |
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| CN112024595B (en) * | 2020-09-07 | 2022-03-11 | 中冶赛迪工程技术股份有限公司 | Thin strip steel continuous casting and rolling endless rolling method and rolling production line thereof |
| CN112337968B (en) * | 2020-10-29 | 2023-02-03 | 中冶南方工程技术有限公司 | Multifunctional hot-rolled plate strip production unit and production method thereof |
| CN114309072B (en) * | 2021-11-18 | 2023-11-03 | 中冶赛迪工程技术股份有限公司 | Layered accident handling method and device after endless rolling and lower swinging shearing of plate strip |
| CN114101325A (en) * | 2021-11-19 | 2022-03-01 | 一重集团大连工程技术有限公司 | Endless rolling accident treatment process and equipment arrangement |
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