CN115351082B - Method and production line for continuously hot-rolling ultrathin low-carbon strip steel - Google Patents
Method and production line for continuously hot-rolling ultrathin low-carbon strip steel Download PDFInfo
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- CN115351082B CN115351082B CN202211018939.1A CN202211018939A CN115351082B CN 115351082 B CN115351082 B CN 115351082B CN 202211018939 A CN202211018939 A CN 202211018939A CN 115351082 B CN115351082 B CN 115351082B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 26
- 238000005098 hot rolling Methods 0.000 title claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 139
- 238000009749 continuous casting Methods 0.000 claims abstract description 50
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 18
- 238000010008 shearing Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 12
- 230000006698 induction Effects 0.000 claims description 7
- 239000003595 mist Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 239000000443 aerosol Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract description 8
- 230000009466 transformation Effects 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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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
-
- 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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- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention relates to a method and a production line for continuously hot rolling ultrathin low-carbon strip steel, which belong to the technical field of strip steel continuous casting and rolling and comprise a continuous casting machine, a roughing mill set, a shearing and scrap pushing device, a heating device, a fine descaling device, a finishing mill set, a laminar flow cooling device, a high-speed flying shear and a coiling set which are sequentially arranged along the rolling direction, wherein the roughing mill set comprises at least 4 roughing mills, the finishing mill set comprises 5 finishing mills, the coiling set comprises more than 2 coiling machines, and the center distance between a first coiling machine and a finishing mill end frame is not more than 55m; the method realizes collinear production of high-temperature austenite rolling and low-temperature ferrite rolling by means of comprehensive intermediate billet thickness adjustment, heating temperature adjustment, finish rolling frame number adjustment, full line temperature control and the like, can lighten the finish rolling load on the premise of the same ultra-thin strip product thickness, creates conditions for a finish rolling throwing frame, and further gives more transformation time from low-carbon steel austenite to ferrite through a throwing F2 frame, so that ferrite transformation before rolling is changed fully.
Description
Technical Field
The invention belongs to the technical field of continuous casting and rolling of strip steel, and relates to a method and a production line for continuously hot-rolling ultrathin low-carbon strip steel.
Background
The existing industrialized endless continuous casting and rolling production line adopts the configuration of 3 roughs and 5 finish rollers, and can produce ultrathin strip steel through endless hot rolling, but the problem that the low-carbon strip steel product has high yield ratio and affects the stamping forming of downstream users generally exists. The low-temperature ferrite rolling process applied to the continuous casting and rolling production line can reduce the yield ratio of low-carbon steel, but ferrite rolling is realized on the existing headless continuous casting and rolling production line, and has several problems: (1) In order to realize the complete low-temperature ferrite rolling, the finish rolling inlet temperature is required to be reduced to be less than Ar 3, but the finish rolling inlet temperature is transmitted to a later process, so that the coiling temperature is too low, and the temperature requirements of low-temperature start rolling, low-temperature finish rolling and high-temperature coiling required by the ferrite rolling cannot be really realized. (2) The low finish rolling inlet temperature also means that the finish descaling temperature is low, which is easy to cause the risk of incomplete scale removal and is unfavorable for improving the surface quality of the strip steel. (3) If the fine descaling temperature is not reduced, quick cooling is required to be configured after the fine descaling to ensure low-temperature initial rolling, but in order to ensure that the coiling temperature is not too low, 5-frame finish rolling is usually carried out by rolling F1-F2 in an austenite region and rolling F3-F5 in a ferrite region, which has two disadvantages, namely the quick cooling after the fine descaling is easy to cause uneven cooling of strip steel, the temperature is difficult to control, and the uniformity of the tissue performance of a product is further influenced; secondly, the thinning speed of the strip steel is increased between F2 and F3, the strip steel enters the ferrite region from the austenite region for less than 1s, and enough transition time is not needed to enable austenite to transform into ferrite, so that the non-uniformity of the structural performance is easily caused. (4) The rolling by a finish rolling machine can be reserved for more transformation time from austenite to ferrite, but 3 rough rolling and 4 finish rolling are configured, the thickness of an intermediate billet can be as thin as 8mm, and the production of ultrathin strip steel below 1mm is difficult to realize by only 4 finish rolling.
Therefore, how to realize the ferrite rolling of the low-carbon steel on the existing continuous casting and rolling endless rolling production line in theory, and ensure the ultra-thin specification production, and finally realize replacing cold with heat is the problem to be solved by the invention.
Disclosure of Invention
In view of the above, the present invention aims to provide a method and a production line for continuously hot-rolling an ultra-thin low-carbon strip steel, which can achieve both high-temperature austenitic rolling and low-temperature ferritic rolling, and can expand the ferritic rolling function while maintaining the original rolling capability.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The utility model provides a production line of ultra-thin low carbon area steel of continuous hot rolling, includes continuous casting machine, roughing mill group, shearing that set gradually along the rolling direction pushes away useless device, heating device, smart descaling device, finishing mill group, laminar cooling device, high-speed flying shear and coiling group, roughing mill group includes 4 at least roughing mills, and finishing mill group includes 5 finishing mills, and the coiling group includes more than 2 recoilers, and the centre-to-centre spacing of first recoiler and finish rolling end frame is not more than 55m.
Optionally, a rough descaling device is arranged between the continuous casting machine and the rough rolling unit.
Optionally, the rough descaling device and/or the fine descaling device are high-pressure water descaling devices.
Optionally, the heating device is an induction heating device.
Optionally, the shearing and scrap pushing device comprises a swinging shearing device, a scrap pushing device, a rotary drum shearing device and a stacking plate removing device which are sequentially arranged along the rolling direction.
The method for continuously hot rolling the ultrathin low-carbon strip steel provides the production line, which comprises an austenite rolling method and a ferrite rolling method;
the austenite rolling method comprises the following steps: rolling a continuous casting billet with the thickness of 95-120 mm into an intermediate billet with the thickness of 6-18 mm by a roughing mill at the drawing speed of 4.8-6 m/min, controlling the temperature of the intermediate billet at the inlet of a heating device to be 880 ℃ or higher, controlling the temperature of the outlet of the heating device to be 1100 ℃ or higher, controlling the temperature of the inlet of a first finishing mill F1 to be 990 ℃ or higher, controlling the temperature of the outlet of a fifth finishing mill F5 to be 840-860 ℃, finishing rolling by a continuous 5 finishing mill, rolling into strip steel with the thickness of 0.6-1.2 mm, and controlling the coiling temperature of the strip steel to be 640 ℃ or higher after laminar cooling;
The ferrite rolling method comprises the following steps: rolling a continuous casting billet with the thickness of 95-120 mm into an intermediate billet with the thickness of 6-10 mm by a roughing mill at the drawing speed of 4.8-6 m/min, controlling the temperature of the intermediate billet at an inlet of a heating device to be more than 880 ℃, controlling the temperature of an outlet of the heating device to be 1050-1070 ℃, controlling the temperature of an inlet of a first finishing mill F1 to be 950-970 ℃, controlling the temperature of a second finishing mill F2 to be empty, controlling the temperature of an inlet of a third finishing mill F3 to be 870-890 ℃, controlling the temperature of an outlet of a fifth finishing mill F5 to be 760-800 ℃, controlling the cumulative rolling reduction of F3-F5 to be more than 60%, finishing rolling into a strip steel with the thickness of 0.6-1.2 mm by a 4-frame, and controlling the coiling temperature of the strip steel to be more than 660 ℃ after laminar cooling.
Optionally, the steel strip has a carbon equivalent of no more than 0.05.
Alternatively, the pulling speed of a continuous casting billet with the thickness of 95mm is not lower than 5.8m/min, the pulling speed of a continuous casting billet with the thickness of 105mm is not lower than 5.3m/min, the pulling speed of a continuous casting billet with the thickness of 110mm is not lower than 5.0m/min, and the pulling speed of a continuous casting billet with the thickness of 120mm is not lower than 4.8m/min.
Optionally, high-pressure water of 10MPa to 20MPa is adopted for rough descaling before rough rolling.
Alternatively, the strip steel temperature drop between F1 and F3 is air cooling, aerosol cooling or water mist cooling.
The invention has the beneficial effects that:
By the arrangement of the rough rolling 4 frames, thinner intermediate blanks can be rolled, and on the premise of the same thickness of the thin strip products, the finish rolling load can be reduced, thereby creating conditions for the finish rolling throwing frame. Through throwing the F2 frame, give the time that low carbon steel austenite changed more to ferrite, make the ferrite transformation more abundant before rolling, simultaneously, the belted steel temperature drop between F1 to F3 is the air cooling, and the cooling homogeneity promotes by a wide margin compared with the water-cooling, and these belted steel tissue property homogeneity promotion under the ferrite rolling mode all is favorable to. In addition, the configuration of the roughing stand and the finish rolling stand of the production line 4 and the finish rolling stand can still realize the production process of the existing headless continuous casting and continuous rolling industrial product, and on the basis, the ferrite rolling process is expanded, and the production flexibility and the adaptability of the production line are improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic layout of a production line of the continuous hot-rolled ultrathin low-carbon strip steel of the invention.
Reference numerals: the continuous casting machine 1, a rough descaling device 2, a rough rolling unit 3, a swinging shear 4, a scrap pushing device 5, a rotary drum shear 6, a stacking plate removing device 7, a heating device 8, a fine descaling device 9, a finishing mill unit 10, a laminar cooling device 11, a high-speed flying shear 12, a coiling unit 13, a continuous casting blank 101, an intermediate blank 102 and strip steel 103.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, a continuous hot rolling production line for ultra-thin low-carbon strip steel comprises a continuous casting machine 1, a roughing mill group 3, a shearing and scrap pushing device, a heating device 8, a fine descaling device 9, a finishing mill group 10, a laminar flow cooling device 11, a high-speed flying shear 12 and a coiling unit 13 which are sequentially arranged along a rolling direction, wherein the roughing mill group 3 comprises at least 4 roughing mills, the finishing mill group 10 comprises 5 finishing mills, the coiling unit 13 comprises more than 2 coiling machines, and the center distance between a first coiling machine and a finishing mill end frame is not more than 55m. Theoretically, the roughing mill train 3 may select more than 4 roughing mills, but from the viewpoint of economy, the roughing mill train 3 may preferably select 4 roughing mills.
The rough descaling device 2 can be arranged or not arranged in front of the rough rolling unit 3, and the rough descaling device 2 is preferably arranged between the continuous casting machine 1 and the rough rolling unit 3, so that oxide scales can be removed by arranging the rough descaling device 2, oxide scales formed in the stage of the continuous casting blank 101 are prevented from entering rough rolling, the surface quality of the strip steel 103 is influenced, and the surface quality of the strip steel 103 can be improved. The rough descaling device 2 and the fine descaling device 9 are preferably high-pressure water descaling devices.
The heating device 8 can be an induction heating device or a flue gas heating device, preferably an induction heating device, and the induction heating device is convenient to arrange and flexible in temperature regulation and control.
The shearing and scrap pushing device can be composed of a swinging shear 4 and a scrap pushing device 5 which are sequentially arranged along the rolling direction, and can also be composed of a swinging shear 4, a scrap pushing device 5, a rotary drum shear 6 and a stacking plate removing device 7 which are sequentially arranged along the rolling direction, wherein the stacking plate removing device is convenient for accident handling.
The method for continuously hot-rolling the ultrathin low-carbon strip steel provides the production line, and rough rolling is performed by adopting 4 roughing mills, wherein the method comprises an austenite rolling method and a ferrite rolling method;
The austenite rolling method comprises the following steps: rolling the continuous casting billet 101 with the thickness of 95-120 mm into an intermediate billet 102 with the thickness of 6-18 mm by a roughing mill set 3 at the drawing speed of 4.8-6 m/min, controlling the temperature of the intermediate billet 102 at the inlet of a heating device 8 to be 880 ℃ or higher, controlling the temperature at the outlet of the heating device 8 to be 1100 ℃ or higher, controlling the temperature at the inlet of a first finishing mill F1 to be 990 ℃ or higher, controlling the temperature at the outlet of a fifth finishing mill F5 to be 840-860 ℃, finishing rolling by a continuous 5 finishing mill, rolling into a strip steel 103 with the thickness of 0.6-1.2 mm, and controlling the coiling temperature to be 640 ℃ or higher after the strip steel 103 is cooled by laminar flow;
The ferrite rolling method comprises the following steps: the continuous casting billet 101 with the thickness of 95mm to 120mm is rolled into an intermediate billet 102 with the thickness of 6mm to 10mm by a roughing mill group 3 at the drawing speed of 4.8m/min to 6m/min, the temperature of the intermediate billet 102 at the inlet of a heating device 8 is controlled to be more than 880 ℃, the temperature at the outlet of the heating device 8 is controlled to be 1050 ℃ to 1070 ℃, the temperature at the inlet of a first finishing mill F1 is controlled to be 950 ℃ to 970 ℃, a second finishing mill F2 is emptied, the temperature at the inlet of a third finishing mill F3 is controlled to be 870 ℃ to 890 ℃, the temperature at the outlet of a fifth finishing mill F5 is controlled to be 760 ℃ to 800 ℃, the accumulated rolling reduction rate of F3 to F5 is more than 60%, the strip steel 103 with the thickness of 0.6mm to 1.2mm is rolled into strip steel 103 by a 4-frame finish rolling mill, and the coiling temperature is controlled to be more than 660 ℃ after the strip steel 103 is cooled by laminar flow.
The temperature drop of the strip steel 103 between F1 and F3 can be air cooling, aerosol cooling or water mist cooling, preferably air cooling. Compared with water cooling, the air cooling has the advantages that the cooling uniformity is greatly improved, and the improvement of the uniformity of the structure performance of the strip steel 103 in the ferrite rolling mode is facilitated.
Before rough rolling, high-pressure water of 10-20 MPa is preferably used for rough descaling so as to remove oxide scales, and the oxide scales formed in the stage of continuous casting blank 101 are prevented from entering rough rolling, so that the surface quality of the strip steel 103 is prevented from being influenced.
Optionally, the carbon equivalent of the low carbon steel used for the strip steel is not more than 0.05; the corresponding drawing speed of the continuous casting blank 101 with the thickness of 95mm is not lower than 5.8m/min, the corresponding drawing speed of the continuous casting blank 101 with the thickness of 105mm is not lower than 5.3m/min, the corresponding drawing speed of the continuous casting blank 101 with the thickness of 110mm is not lower than 5.0m/min, and the corresponding drawing speed of the continuous casting blank 101 with the thickness of 120mm is not lower than 4.8m/min.
The invention realizes a production line with high-temperature austenite rolling and low-temperature ferrite rolling process by integrating the means of thickness adjustment, induction heating temperature adjustment, finish rolling frame number adjustment, full line temperature control and the like of the intermediate billet 102. By the arrangement of the 4 rough rolling frame and the 5 finish rolling frame, thinner intermediate blanks 102 can be rolled under the same equipment parameters as the prior art, and the finish rolling load can be reduced on the premise of the same thickness of ultrathin strip products, thereby creating conditions for the finish rolling throwing frame. The F2 frame is thrown to give more transformation time from low-carbon steel austenite to ferrite, so that ferrite transformation before rolling is more sufficient, meanwhile, the temperature of the strip steel 103 between F1 and F3 is reduced to be air cooling or gas (water) mist cooling, and the cooling uniformity is high, so that the uniformity of the structure property of the strip steel 103 in a ferrite rolling mode is improved. In addition, the invention can not only realize the production process of the existing continuous casting and rolling industrial product, but also expand the ferrite rolling process on the basis, thereby increasing the flexibility and adaptability of the production line.
Examples
A continuous hot rolling ultrathin low-carbon strip steel production line with high-temperature austenite rolling and low-temperature ferrite rolling comprises a continuous casting machine 1, a high-pressure water rough descaling device 2, a rough rolling unit 3, a pendulum shear 4, a waste pushing device 5, a rotary drum shear 6, a stacking plate removing device 7, an induction heating device 8, a high-pressure water fine descaling device 9, a finishing mill group 10, a laminar cooling device 11, a high-speed flying shear 12 and a coiling unit 13 which are connected in sequence.
The rough descaling pressure is 10 MPa-20 MPa, the fine descaling pressure is 40MPa, 4 frames (R1-R4) are continuously arranged in the rough rolling unit 3,5 frames (F1-F5) are continuously arranged in the finish rolling unit 10, 3 frames (DC 1-DC 3) are continuously arranged in the coiling machine 13, and the center distance between the F5 and the first coiling machine (DC 1) is not more than 50m. The parameters of key equipment such as a rolling mill, a shearing machine, a coiling machine and the like are similar to those of the prior art, and are shown in table 1.
TABLE 1 Key plant parameters for Rolling lines
In the production line shown in fig. 1, a typical low carbon steel production process is illustrated.
The low-carbon strip steel comprises the following chemical components in percentage by mass: less than or equal to 0.02 percent of C, less than or equal to 0.1 percent of Mn, less than or equal to 0.05 percent of Si, less than or equal to 0.02 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.04 percent of Alt and the balance of Fe. The Ar 3 under the component is 880-890 ℃ under the cooling speed of 1-5 ℃/s.
Case one: continuous casting into continuous casting blanks 101 with the width of 1250mm and the thickness of 105mm, continuous casting drawing speed of 5.3m/min, rough descaling and 4 rough rolling units, changing into intermediate blanks 102 with the thickness of 6 mm-7 mm, running to a finishing rolling unit, rolling strip steel 103 with the thickness of 0.7mm, cutting by high-speed flying shears, and coiling by a coiling machine.
The process temperatures and deformation regimes for the two rolling modes are shown in tables 2 and 3.
TABLE 2 Austenitic Rolling modes 105mm-0.7mm
TABLE 3 ferrite Rolling modes of 105mm-0.7mm
Case two: continuous casting is carried out to obtain continuous casting blanks 101 with the width of 1400mm and the thickness of 105mm, the continuous casting pulling speed is 5.3m/min, then the continuous casting blanks are changed into intermediate blanks 102 with the thickness of 6 mm-8 mm through a rough descaling unit and a 4-frame rough rolling unit, the intermediate blanks are then conveyed to a finish rolling unit, strip steel 103 with the thickness of 0.7mm is rolled, the strip steel is cut by a high-speed flying shear, and finally coiled by a coiling machine.
The process temperatures and deformation regimes for the two rolling modes are shown in tables 4 and 5.
TABLE 4 Austenitic Rolling modes 105mm-0.9mm
TABLE 5 ferrite Rolling modes of 105mm-0.9mm
Case three: continuous casting is carried out to form a continuous casting blank 101 with the width of 1250mm and the thickness of 110mm, the continuous casting drawing speed is 5.1m/min, then the continuous casting blank is changed into an intermediate blank 102 with the thickness of 6mm to 8mm through a rough descaling unit and 4 rough rolling units, the intermediate blank is then moved to a finish rolling unit, strip steel 103 with the thickness of 0.8mm is rolled, the strip steel is cut by a high-speed flying shear, and finally the strip steel is coiled by a coiling machine.
The process temperatures and deformation regimes for the two rolling modes are shown in tables 6 and 7.
TABLE 6 110mm-0.9mm Austenitic Rolling mode
TABLE 7 110mm-0.9mm ferrite Rolling modes
According to the equipment configuration of the prior art, the thickness of the intermediate billet 102 can be reduced from 8mm to 6mm by keeping the continuous casting high-pass steel amount and increasing 1 roughing mill, namely 4 roughing mills, and the rolling load of the finishing mill group 10 is reduced when the thickness is extremely thin below 1mm, and meanwhile, the beneficial condition is created for the rolling of a throwing frame; the process conditions are created for realizing the ferrite rolling of the real extremely thin specification by the F2 frame and the arranged short-distance coiling unit 13. Because the temperature drop of the strip steel between F2 and F1 and F3 is air cooling or gas (water) fog cooling, the time for converting low-carbon steel austenite into ferrite is given to ensure that the ferrite is converted more fully before rolling, and meanwhile, compared with water cooling, the cooling uniformity is greatly improved, and the uniformity of the strip steel structure performance in a ferrite rolling mode is improved. In addition, the 4 rough rolling stand and the 5 finish rolling stand are configured, so that the production line can realize high-temperature austenite rolling and low-temperature ferrite rolling in the prior art, and the production flexibility and adaptability of the production line are improved.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (9)
1. A method for continuously hot rolling ultrathin low-carbon strip steel is characterized by comprising the following steps: providing a production line, wherein the production line comprises a continuous casting machine, a roughing mill set, a shearing and waste pushing device, a heating device, a fine descaling device, a finishing mill set, a laminar flow cooling device, a high-speed flying shear and a coiling set which are sequentially arranged along a rolling direction, the roughing mill set comprises at least 4 roughing mills, the finishing mill set comprises 5 finishing mills, the coiling set comprises more than 2 coiling machines, and the center distance between a first coiling machine and a finishing mill end frame is not more than 55m;
The method includes an austenite rolling method and a ferrite rolling method;
The austenite rolling method comprises the following steps: rolling a continuous casting billet with the thickness of 95-120 mm into an intermediate billet with the thickness of 6-18 mm by a roughing mill at the drawing speed of 4.8-6 m/min, controlling the temperature of the intermediate billet at the inlet of a heating device to be 880 ℃ or higher, controlling the temperature of the outlet of the heating device to be 1100 ℃ or higher, controlling the temperature of the inlet of a first finishing mill F1 to be 990 ℃ or higher, controlling the temperature of the outlet of a fifth finishing mill F5 to be 840-860 ℃, finely rolling by a continuous 5 finishing mill, rolling into strip steel with the thickness of 0.6-1.2 mm, and controlling the coiling temperature of the strip steel to be 640 ℃ or higher after laminar cooling;
The ferrite rolling method comprises the following steps: the continuous casting billet with the thickness of 95-120 mm is rolled into an intermediate billet with the thickness of 6-10 mm by a roughing mill at the drawing speed of 4.8-6 m/min, the temperature of the intermediate billet at the inlet of a heating device is controlled to be more than 880 ℃, the temperature of the outlet of the heating device is controlled to be 1050-1070 ℃, the temperature of the inlet of a first finishing mill F1 is controlled to be 950-970 ℃, a second finishing mill F2 is empty, the temperature of the inlet of a third finishing mill F3 is controlled to be 870-890 ℃, the temperature of the outlet of a fifth finishing mill F5 is controlled to be 760-800 ℃, the cumulative rolling reduction rate of F3-F5 is more than 60%, the rolling is controlled to be more than 660 ℃ after the strip steel is cooled by laminar flow by a 4-frame, and the rolling temperature of strip steel is controlled to be more than 660 ℃.
2. The method for continuously hot rolling ultra-thin low carbon strip steel according to claim 1, wherein: a rough descaling device is arranged between the continuous casting machine and the rough rolling unit.
3. The method for continuously hot rolling ultra-thin low carbon strip steel according to claim 2, wherein: the rough descaling device and/or the fine descaling device are high-pressure water descaling devices.
4. The method for continuously hot rolling ultra-thin low carbon strip steel according to claim 1, wherein: the heating device is an induction heating device.
5. The method for continuously hot rolling ultra-thin low carbon strip steel according to claim 1, wherein: the shearing and waste pushing device comprises a swinging shear device, a waste pushing device, a rotary drum shear device and a stacking plate removing device which are sequentially arranged along the rolling direction.
6. The method for continuously hot rolling ultra-thin low carbon strip steel according to claim 1, wherein: the carbon equivalent of the strip steel is not more than 0.05.
7. The method for continuously hot rolling ultra-thin low carbon strip steel according to claim 1, wherein: the rough rolling is carried out by adopting 4 roughing mills, the corresponding pulling speed of the continuous casting billet with the thickness of 95mm is not lower than 5.8m/min, the corresponding pulling speed of the continuous casting billet with the thickness of 105mm is not lower than 5.3m/min, the corresponding pulling speed of the continuous casting billet with the thickness of 110mm is not lower than 5.0m/min, and the corresponding pulling speed of the continuous casting billet with the thickness of 120mm is not lower than 4.8m/min.
8. The method for continuously hot rolling ultra-thin low carbon strip steel according to claim 1, wherein: and (3) carrying out rough descaling by adopting high-pressure water with the pressure of 10-20 MPa before rough rolling.
9. The method for continuously hot rolling ultra-thin low carbon strip steel according to claim 1, wherein: the temperature drop of the strip steel between F1 and F3 is air cooling, aerosol cooling or water mist cooling.
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| IT1290743B1 (en) * | 1997-04-10 | 1998-12-10 | Danieli Off Mecc | LAMINATION PROCESS FOR FLAT PRODUCTS WITH THIN THICKNESSES AND RELATED ROLLING LINE |
| US6182490B1 (en) * | 1999-03-19 | 2001-02-06 | Danieli Technology Inc. | Super thin strip hot rolling |
| JP4714828B2 (en) * | 2004-08-06 | 2011-06-29 | 独立行政法人物質・材料研究機構 | Metal wire with large strain introduced by warm controlled rolling, and manufacturing method and manufacturing apparatus thereof |
| DE102008003222A1 (en) * | 2007-09-13 | 2009-03-19 | Sms Demag Ag | Compact flexible CSP system for continuous, semi-continuous and batch operation |
| DE102009057524A1 (en) * | 2009-12-02 | 2011-06-09 | Sms Siemag Ag | Process for hot rolling a metal strip or sheet and hot rolling mill |
| EP2441540A1 (en) * | 2010-10-12 | 2012-04-18 | Siemens VAI Metals Technologies GmbH | Method and assembly for energy-efficient production of hot rolled steel strips |
| CN107755425A (en) * | 2016-08-20 | 2018-03-06 | 韩海威 | With the technique for improving hot-strip production efficiency function |
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| CN217798066U (en) * | 2022-08-24 | 2022-11-15 | 中冶赛迪工程技术股份有限公司 | Production line for continuously hot-rolling ultrathin low-carbon strip steel |
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