CN212442556U - Thin strip steel continuous casting and rolling endless rolling production line - Google Patents
Thin strip steel continuous casting and rolling endless rolling production line Download PDFInfo
- Publication number
- CN212442556U CN212442556U CN202021935129.9U CN202021935129U CN212442556U CN 212442556 U CN212442556 U CN 212442556U CN 202021935129 U CN202021935129 U CN 202021935129U CN 212442556 U CN212442556 U CN 212442556U
- Authority
- CN
- China
- Prior art keywords
- rolling
- continuous casting
- heating device
- accident
- production line
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model belongs to the technical field of steel continuous casting and rolling, a thin belted steel continuous casting and rolling endless rolling production line is related to, including the conticaster that connects gradually, roughing mill group, the pendulum is cut, useless base release and buttress board device, heating device I, finish rolling unit in advance, heating device II, the accident is cut, finish rolling unit, ultrafast cooling device, laminar cooling device, high-speed flying shear and batch unit, wherein heating device II realizes the switching of II austenite rolling of intermediate blank and the rolling required temperature of ferrite, the finish rolling frame selects 3~4 framves, it controls more easily to make the initial rolling temperature when intermediate blank II carries out the ferrite rolling, through the reasonable temperature regulation and control of heating device, make can carry out the austenite rolling and also can carry out the rolling production belted steel of ferrite on same production line, strengthen the market competition of thin belted steel.
Description
Technical Field
The utility model belongs to the technical field of steel continuous casting and rolling, a thin strip steel continuous casting and rolling headless rolling production line is related to, especially relate to one kind and realize thin strip steel continuous casting and rolling headless rolling production line of austenite rolling and ferrite rolling on same production line.
Background
Since the first CSP production line in the world of production was established by Nikoku iron and Steel company in 1989, the continuous casting and rolling technology has been rapidly developed for decades, and the ISP technology of Germany Demak company, the CONROLL technology of Austrian Olympic company, the QSP technology of Japanese Sumitomo company, the FTSR technology of Italy Dannelli company, the ESP technology of Italy Abdi company and the like are successively introduced. In recent years, the ESP endless continuous casting and rolling process has achieved great success in industrial application, and compared with the conventional hot continuous rolling, the ESP endless continuous casting and rolling process has the advantages of compact flow, low energy consumption and obviously reduced cost of steel per ton; the continuous casting speed is high, and the production efficiency is high; the process of threading and drifting of the strip steel during single-block rolling is omitted in endless rolling, the accuracy and stability of the size and performance of the strip steel are obviously improved, the thickness specification of the stably produced strip steel is as low as 0.8mm, partial replacement of cold by hot is realized, and the production cost of the strip steel is reduced.
As a revolutionary hot-rolled strip steel production technology, the ESP technology has many advantages which are not possessed by conventional hot continuous rolling, but the yield ratio of the produced low-carbon steel is often more than 0.8 and higher than that of similar products (less than 0.7) produced by conventional hot continuous rolling, the strip steel formability is poor, and the application range of the products is limited. High-pressure water descaling is not configured before rough rolling of an ESP production line, and the scale of a continuous casting blank strip enters a rough rolling unit for rolling, so that the genetic scale residue defect on the surface of the final finished product strip steel is caused. And the cooling section of the ESP production line after rolling is configured as a common laminar cooling device, so that the cooling capacity is weak, the capacity of producing steel varieties is insufficient, and the product outline is limited. In addition, the roll gap adjusting mode of the rough rolling machine frame R1 of the ESP production line is that the upper roll is pressed down, the elevation of the lower roll is not moved, and when the rolling specification is changed, the elevation of the axis of the strip steel is changed and is inconsistent with the continuous casting elevation, so that the last sector section frame of the continuous casting is impacted by the continuous casting billet.
The ferrite rolling technique, i.e. the phase change controlled rolling, is a new rolling process developed in recent years, and is gradually used for producing the hot rolled steel plate with ultra-thin specification to replace the traditional cold rolling and annealing process. The new technology can produce the coil with low yield ratio and high elongation, has the advantages of low cost, high productivity, high product quality and the like, and becomes an important development direction of the production process of the hot-rolled strip steel. At present, there are some patents related to the ferrite rolling technology applied to the ESP production line, but these patents have many problems in realizing the real ferrite rolling, for example, the start rolling temperature control for ferrite rolling is very difficult due to the adoption of 5 stands for the finish rolling stand, if the start rolling temperature is low, the descaling is not favorable, and the ESP relies on the descaling before finish rolling, which causes defects on the surface quality of strip steel, and simultaneously brings too low subsequent hereditary coiling temperature, which is contrary to the high-temperature coiling concept; if the descaling is considered, the initial rolling temperature is increased, and a plurality of stands are rolled in an austenite ferrite dual-phase region during the finish rolling of the strip steel, so that the phenomenon of mixed crystals is easy to occur, and the mechanical property of the product is influenced.
In addition, some patents develop specialized ferrite rolling thin strip steel production lines, but the types and specifications of products which can be produced by the production lines are limited, so that the resistance to market fluctuation is poor. The development of a process technology which can realize both austenite rolling and ferrite rolling on the same production line is the current technical development trend and is also the market demand.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a thin band steel continuous casting continuous rolling endless rolling production line, this rolling production line can realize that austenite is rolled and ferrite is rolled on same production line, can be with the product of many varieties, many specifications of austenite rolling process production, can produce the thin specification belted steel of low yield ratio with ferrite rolling process again to improve belted steel's surface quality, when guaranteeing enough market adaptability, possess the technology and the equipment condition of producing high quality belted steel, reinforcing market competition.
In order to achieve the above purpose, the utility model provides a thin strip steel continuous casting and rolling endless rolling production line, which comprises a continuous casting machine, a rough rolling unit, a pendulum shear, a waste billet push-out and stacking device, a heating device I, a pre-finishing rolling unit, a heating device II, an accident shear, a finishing rolling unit, an ultra-fast cooling device, a laminar cooling device, a high-speed flying shear and a coiling unit which are connected in sequence, wherein the heating device I realizes the temperature compensation of an intermediate billet I after rough rolling, the heating device II realizes the temperature switching required by the austenite rolling and the ferrite rolling of the intermediate billet II, the rough rolling unit comprises two or more rough rolling frames which are arranged in sequence along the rolling direction, the pre-finishing rolling unit comprises two or more pre-finishing rolling frames which are arranged in sequence along the rolling direction, the finishing rolling unit comprises 3-4 finishing rolling frames which are arranged in sequence along the rolling direction, the coiling unit comprises two or more coiling machines which are arranged in sequence along the rolling direction, the distance between the outlet of the continuous casting machine and the center line of the first rough rolling stand along the rolling direction is 5-8 m, the distance between the center lines of the adjacent rough rolling stands, the adjacent pre-finish rolling stands and the adjacent finish rolling stands is 4-5 m, and the distance between the center lines of the last finish rolling stand along the rolling direction and the first coiling machine along the rolling direction is not more than 60 m.
Further, the inlets of the roughing mill group, the pre-finishing mill group and the finishing mill group are respectively provided with a high-pressure water rough descaling device, a high-pressure water rough descaling device and a high-pressure water finishing descaling device.
Further, the inlet temperature of the intermediate billet II in the finish rolling stand is 980 ℃ +/-20 ℃, the outlet temperature of the strip steel in the finish rolling stand is 840 ℃ +/-20 ℃, and the coiling temperature of the strip steel is 400-700 ℃ during the austenite rolling; when ferrite rolling is carried out, the inlet temperature of the intermediate billet II in the finish rolling stand is 900 +/-20 ℃, the outlet temperature of the strip steel in the finish rolling stand is 770 +/-20 ℃, and the coiling temperature of the strip steel is above 650 ℃.
Further, an accident loop I is arranged on the waste blank pushing and stacking device, and an accident loop II is arranged on the accident shears.
Further, the heating device I is a gas furnace or an induction heater, and the heating device II is also a gas furnace or an induction heater.
Further, the roughing stand adopts a push-up type hydraulic roll gap adjusting technology, namely, the lower roll is pushed up through a hydraulic cylinder.
A thin strip continuous casting and rolling endless rolling method is characterized by comprising the following steps:
A. after preliminary descaling is carried out on a continuous casting blank cast by a continuous casting machine through a high-pressure water rough descaling device, continuously rolling the continuous casting blank into an intermediate blank I with the thickness of 20-30 mm through two or more rough rolling stands sequentially arranged along the rolling direction, wherein the continuous casting outlet temperature of the continuous casting blank is 1030 +/-20 ℃, and the outlet temperature of the intermediate blank I at the rough rolling stand is not lower than 950 ℃;
B. after the temperature of the intermediate billet I is compensated by a heating device I, secondarily descaling by a high-pressure water descaling device, continuously rolling the secondarily-descaled intermediate billet I into an intermediate billet II with the thickness of 4-10 mm by two or more pre-finishing mill frames which are sequentially arranged along the rolling direction, wherein the inlet temperature of the intermediate billet I in the pre-finishing mill frame is not lower than 970 ℃, and the outlet temperature of the intermediate billet II in the pre-finishing mill frame is not lower than 930 ℃;
C. adjusting the temperature of the intermediate billet II by a heating device II, then carrying out tertiary descaling by a high-pressure water fine descaling device, continuously rolling the intermediate billet II subjected to tertiary descaling into finished strip steel with the thickness of 0.8-4 mm by 3-4 rolling stands sequentially arranged along the rolling direction, then carrying out controlled cooling by an ultra-fast cooling device and a laminar cooling device in sequence, cutting the cooled finished strip steel by high-speed flying shear, and collecting the cut strip steel into coils by a coiling machine, wherein the heating device II realizes the temperature switching required by the austenite rolling and ferrite rolling of the intermediate billet II, the inlet temperature of the intermediate billet II at the rolling stand is 980 ℃ plus or minus 20 ℃ when the austenite rolling is carried out, the outlet temperature of the strip steel at the rolling stand is 840 ℃ plus or minus 20 ℃, and the coiling temperature of the strip steel is 400-700 ℃; when ferrite rolling is carried out, the inlet temperature of the intermediate billet II in the finish rolling stand is 900 +/-20 ℃, the outlet temperature of the strip steel in the finish rolling stand is 770 +/-20 ℃, and the coiling temperature of the strip steel is above 650 ℃.
Further, the continuous casting drawing speed of the continuous casting machine in the step A is 5.5-6 m/min, and the thickness of the continuous casting slab is 90-130 mm.
Further, a pendulum shear and a waste billet pushing and stacking device with an accident loop I are sequentially arranged on a rolling production line between a roughing stand and a heating device I, an accident shear with an accident loop II is arranged on a rolling production line between a heating device II and a high-pressure water fine descaling device, when an accident occurs in the process after finish rolling and finish rolling, a finish rolling stand is lifted to form a roll gap, continuous casting and continuous casting are carried out, the accident shear and the pendulum shear are simultaneously sheared, the accident loop I and the accident loop II are rapidly lifted, the accident shear breaks a rolled piece between the pendulum shear and the accident shear and then moves out waste steel, the pendulum shear carries out fixed-length shearing on a rough-rolled intermediate billet I and pushes the rough-rolled intermediate billet out of a rolling line by a waste billet pushing device, and after the accident treatment, the accident loop I and the accident loop II return to the original position and carry out rolling again; when an accident occurs in the area before and after pre-finish rolling, the pre-finish rolling rack is lifted to form a roll gap, continuous casting is stopped, the roll gap is cut simultaneously through an accident shear and a pendulum shear, the accident loop I and the accident loop II are rapidly lifted at the same time, the rolling of the subsequent finish rolling area is ensured to be completed, the pendulum shear is pushed out and then pushed into a waste area, the pendulum shear carries out fixed-length shearing on the intermediate blank I after rough rolling and is pushed away from a rolling line by a waste blank pushing device, and after the accident treatment is finished, the accident loop I and the accident loop II are reset and are rolled again in a threading manner; when an accident occurs in a rough rolling area, the continuous casting machine stops casting rapidly, the rough rolling frame is lifted to form a roll gap, the intermediate billet I is sheared off by the swing, the accident loop I is lifted rapidly, the condition that a strip is rolled in a later process is guaranteed, a waste pushing area is set aside, and after the accident is processed, the continuous casting machine is restarted and rolled in a strip penetrating mode.
Further, the roughing stand adopts a push-up type hydraulic roll gap adjusting technology, namely, the lower roll is pushed up through a hydraulic cylinder.
The beneficial effects of the utility model reside in that:
1. the utility model discloses a thin strip steel continuous casting and rolling headless rolling production line, 3~4 framves are selected to the finish rolling frame for it controls more easily to open the rolling temperature when ferrite is rolled to middle base II. When the ferrite rolling process is adopted, the inlet temperature of a finish rolling stand is limited to 900 +/-20 ℃, the outlet temperature of strip steel at the finish rolling stand is limited to 770 +/-20 ℃, and the following problems caused by too many finish rolling stands are avoided: if the finish rolling temperature is controlled, the finish rolling inlet temperature is too high, and the phenomenon of mixed crystals occurs when a plurality of stands are rolled in an austenite ferrite dual-phase region during finish rolling, so that the mechanical property of a product is influenced; if the lower finish rolling inlet temperature is controlled to avoid the two-phase zone rolling, the disadvantages of scale removal and surface quality defects are caused, and the final rolling temperature and the coiling temperature are too low, which is contrary to the ferrite rolling high-temperature coiling theory.
2. The utility model discloses a thin band steel continuous casting and rolling endless rolling production line has proposed rough rolling, finish rolling in advance, the three-stage rolling process route of finish rolling, has arranged heating device I between rough rolling and finish rolling in advance, arranges heating device II between finish rolling and finish rolling in advance, and I temperature compensating of intermediate billet after heating device I realizes rough rolling, and I finish rolling phase in advance of assurance intermediate billet is still in the rolling temperature requirement of austenite. The heating temperature of the intermediate billet II after pre-finish rolling is adjusted through the heating device II, and a temperature system is flexibly formulated according to needs, so that the rolling production line can finish the austenite rolling production of various and multi-specification strip steels, and can also realize the ferrite rolling production of low-yield-ratio thin-specification strip steels.
3. The utility model discloses a thin belted steel continuous casting and rolling headless rolling production line, the entrance of roughing mill group, pre-finishing mill group and finishing mill group sets up high pressure water rough descaling device, high pressure aquatic descaling device and high pressure water finish descaling device respectively, is different from ESP rolling production line and has only set up high pressure water finish descaling case before finishing mill group, the utility model discloses a configuration can avoid the iron scale to remain the defect at the finished product belted steel surface iron scale that the belted steel leads to of impressing in rolling stage, can obviously improve belted steel surface quality.
4. The utility model discloses a thin band steel continuous casting and rolling headless rolling production line, cooling device after the finish rolling adopt super fast cold charge and laminar flow cooling device, provide multi-mode cooling path, are different from ESP rolling production line and roll the back cooling and only dispose ordinary laminar flow cooling device, the utility model discloses a configuration has improved and has rolled the back cooling power, is favorable to the production of high-strength steel, diphase steel and the excellent steel of part.
5. The utility model discloses a thin strip steel continuous casting and rolling headless rolling production line cuts the accident and accident loop II arranges behind heating device II, is different from current ESP rolling production line accident and cuts and accident loop is located before heating device. The arrangement form of the utility model is beneficial to the accident treatment of pre-finish rolling, namely, when the accident of pre-finish rolling is happened, the front and the back are provided with the strip steel shearing devices, which is convenient to be separated from the front and the back processes, and accelerates the speed of processing the waste steel; and secondly, the method is beneficial to ensuring that the strip steel is still in an austenite region when being conveyed to a finish rolling inlet after being subjected to finish rolling, and ferrite phase transformation cannot occur to cause mixed crystals of strip steel finished products and influence plasticity. Because the thickness of the steel strip becomes thinner after the pre-finish rolling, the temperature drop is faster, the accident scissors and the accident loop II are arranged in front of the heating device II, the air cooling section is lengthened, the temperature of the steel strip is easily reduced to be below the phase change point, mixed crystals are caused, the temperature can be effectively prevented from being reduced to be below the phase change point by the pre-finish rolling and then being connected with the heating device II, and the guarantee performance of the steel strip is facilitated.
6. The utility model discloses a thin strip steel continuous casting and rolling headless rolling production line, roughing mill group's frame adopt to push away formula hydraulic pressure roll gap adjustment technique, and the lower roll passes through the pneumatic cylinder promptly and pushes away, and roll gap adjustment only is under the roller pressure in the present ESP rolling production line roughing process, and the lower roll is motionless, and when easily making rolling, rolling elevation changes, and is inconsistent with the continuous casting elevation, causes the continuous casting billet warpage, strikes last fan-shaped section frame. The utility model discloses a lower roll pushes away formula hydraulic pressure roll gap adjustment technique, goes up the roll gap promptly and pushes down, and the lower roll lifting forms symmetrical roll gap and adjusts, ensures permanent rolling elevation to alleviate the impact of steel rolling to the last fan-shaped section frame of continuous casting, improve the life of fan-shaped section, realize that the continuous casting steel rolling links up softly.
7. The utility model discloses a thin band steel continuous casting and tandem rolling headless rolling production line is different from ESP rolling production line, has released and has integrateed the accident loop function on the buttress board device at the waste billet, can be when the accident appears in the low reaches, controls this regional loop lifting, lets out the waste billet and releases the district, and the pendulum is cut the fragmentation to the intermediate stock of roughing, and the waste billet is released and is buttress the board device and push away from rolling the line, guarantees that the continuous casting is incessantly watered.
8. The utility model discloses a thin band steel continuous casting and rolling headless rolling production line, the last finish rolling frame of finish rolling unit along rolling direction and the coiling unit be for not more than 60m along the central line interval between the first frame coiling machine of rolling direction, and it is 69m to be different from current ESP rolling production line to arrange this section apart from the conventionality. After the distance is shortened, the temperature drop after rolling can be reduced, and the coiling temperature is increased, so that the high-temperature coiling process for ferrite rolling is realized. Meanwhile, the ultra-fast cooling and laminar cooling are introduced, so that the thin strip steel can be rapidly cooled, the low-temperature coiling is realized, and conditions are provided for multi-path cooling.
9. The utility model discloses a thin band steel continuous casting and rolling headless rolling production line compares with current ESP rolling production line, the utility model discloses the roughing frame is two, connects the pendulum after the roughing and cuts, and the wedge base that a casting blank head pushed down through the roughing in watering time cuts the waste volume and reduces, can improve the metal yield.
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 objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.
Drawings
For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic layout of a prior art ESP rolling line;
FIG. 2 is a schematic layout view of the thin strip steel continuous casting and rolling endless rolling production line of the present invention;
FIG. 3 is a schematic view of the rolling line of the present invention when an accident occurs in the finish rolling area;
FIG. 4 is a schematic view of the rolling line of the pre-finish rolling area in case of an accident;
FIG. 5 is the processing schematic diagram of the rolling production line when the accident occurs in the rough rolling area of the present invention.
Reference numerals: the system 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 billet pushing and stacking device 5, an accident loop I101, a heating device I6, a high-pressure water descaling device 7, a pre-finishing rolling unit 8, a heating device II 9, an accident shear 10, an accident loop II 102, a high-pressure water finishing descaling device 11, a finishing rolling unit 12, an ultra-fast cooling device 13, a laminar cooling device 14, a high-speed flying shear 15, a coiling unit 16, a continuous casting billet 501, an intermediate billet I502, an intermediate billet II 503 and strip steel 504.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood 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 numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.
The embodiment is basically as shown in the attached figure 1:
the conventional ESP rolling line shown in fig. 1 includes a continuous caster 1 → a roughing mill group 3 → a pendulum shear 4 → a slab pushing and stacking device 5 → an emergency shear 10 → an induction heating device → a high pressure water descaling device 11 → a finishing mill group 12 → a laminar cooling device 14 → a high speed flying shear 15 → a coiler group 16, which are connected in this order.
The thin strip steel continuous casting and rolling endless rolling production line shown in fig. 2 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 blank pushing and stacking device 5 provided with an accident loop I101, a heating device I6, a high-pressure water descaling device 7, a pre-finishing rolling unit 8, a heating device II 9, an accident shear 10 provided with an accident loop II 102, a high-pressure water finishing descaling device 11, a finishing rolling unit 12, an ultra-fast cooling device 13, a laminar cooling device 14, a high-speed flying shear 15 and a coiling unit 16 which are connected in sequence, wherein the heating device I6 is used for realizing temperature compensation of a rough-rolled intermediate blank I502, and the heating device II 9 is used for switching between temperatures required by austenite rolling and ferrite rolling of an intermediate blank II 503.
The roughing mill group 3 includes 2 roughing stands that set gradually along rolling direction, the finishing mill group 8 includes 2 pre-rolling stands that set gradually along rolling direction in advance, finishing mill group 12 includes 4 finishing stands that set gradually along rolling direction, coiling unit 16 includes 3 recoiling machines that set gradually along rolling direction, 1 export of conticaster is 5~8m to the interval between the first roughing stand central line along rolling direction, adjacent roughing stand, adjacent pre-rolling stand, the interval between the adjacent finishing stand central line is 4~5m, central line interval between the last finishing stand of rolling direction and the first recoiling machine along rolling direction is not more than 60 m. Gas furnace or induction heater can be selected respectively to heating device I6 and heating device II 9, and heating device I6 is preferred induction heater, is equipped with 8 ~ 10 induction heater groups, and heating device II 9 is preferred induction heater, and the well 8 ~ 10 induction heater groups that are equipped with.
A thin strip continuous casting and rolling endless rolling method comprises the following steps:
A. after preliminary descaling is carried out on a continuous casting blank 501 cast by a continuous casting machine 1 through a high-pressure water rough descaling device 2, continuously rolling the continuous casting blank 501 into an intermediate blank I502 with the thickness of 20-30 mm through 2 rough rolling stands sequentially arranged along the rolling direction, wherein the continuous casting drawing speed of the continuous casting machine 1 is 5.5-6 m/min, and the thickness of the continuous casting blank 501 is 90-130 mm; the continuous casting outlet temperature of the continuous casting billet 501 is 1030 +/-20 ℃, and the outlet temperature of the intermediate billet I502 in the rough rolling stand is not lower than 950 ℃.
B. After the temperature of the intermediate billet I502 is compensated by a heating device I6, secondary descaling is carried out by a high-pressure water descaling device 7, the intermediate billet I502 after secondary descaling is continuously rolled into an intermediate billet II 503 with the thickness of 4-10 mm by 2 pre-finishing mill frames which are sequentially arranged along the rolling direction, the inlet temperature of the intermediate billet I502 on the pre-finishing mill frame is not lower than 970 ℃, and the outlet temperature of the intermediate billet II 503 on the pre-finishing mill frame is not lower than 930 ℃;
C. the temperature of the intermediate blank II 503 is adjusted by a heating device II 9, then the intermediate blank II 503 is descaled for three times by a high-pressure water fine descaling device 11, the intermediate blank II 503 after the three-time descaling is continuously rolled into a finished product strip steel 504 with the thickness of 0.8-4 mm by 4 finish rolling stands arranged in sequence along the rolling direction, then the finished product strip steel 504 after the three-time descaling is cooled by an ultrafast cooling device 13 and a laminar cooling device 14 in sequence, the cooled finished product strip steel 504 is cut by a high-speed flying shear 15 and then collected into coils by a coiling machine, and the heating device II 9 realizes the temperature switching required by the austenite rolling and ferrite rolling of the.
Wherein the inlet temperature of the intermediate billet II 503 in the finish rolling stand is 980 ℃ +/-20 ℃, the outlet temperature of the strip steel 504 in the finish rolling stand is 840 ℃ +/-20 ℃, and the coiling temperature of the strip steel 504 is 400-700 ℃ during the austenite rolling;
when ferrite rolling is carried out, the inlet temperature of the intermediate billet II 503 of the finish rolling stand is 900 +/-20 ℃, the outlet temperature of the strip steel 504 of the finish rolling stand is 770 +/-20 ℃, and the coiling temperature of the strip steel 504 is above 650 ℃.
The thin strip steel continuous casting and rolling continuous rolling production line has the following steps of forming a complete continuous casting and rolling casting secondary production process: the method comprises the following steps that full-line equipment is prepared for casting, rough rolling, pre-finish rolling, finish rolling and reeling of a pre-swing roller seam are in place, and an accident loop I101 is lifted; casting by a continuous casting machine 1, wherein a dummy bar penetrates through a roughing mill and a pendulum shear 4 to a region of a waste blank pushing and stacking device 5, and is quickly adjusted away from a rolling line by a travelling crane; the swing shear 4 shears the low-temperature casting blank at the head, and the waste blank pushing and stacking device 5 pushes the waste blank out of the rolling line; two roughing stands (R1, R2) are pressed down in sequence by the largest roll gap, a transition wedge-shaped blank is sheared by a pendulum shear 4, and the waste blank is pushed out of a rolling line by a waste blank pushing and stacking device 5; the swing shear 4 stops shearing, the accident loop I101 falls down, a rolled piece sequentially passes through a heating device I6, a high-pressure water descaling device 7, two pre-finishing mill frames (M1 and M2), a heating device II 9, an accident shear 10, a high-pressure water fine descaling device 11, four finishing mill frames (F1, F2, F3 and F4), an ultra-fast cooling device 13, a laminar cooling device 14, a high-speed flying shear 15 and a coiling unit 16, and the headless rolling is started; after the current coil weight reaches the standard, the high-speed flying shears 15 shear the current coil, and the fast switching device of the coiling unit 16 completes the threading switching of different coiling machines of the next coil of strip steel; during endless rolling, the production is carried out according to the principle that the thickness of the strip steel is changed from thick to thin and then from thin to thick, and the dynamic specification change of a rolling mill and the loading roll shifting of a roll are related during the production; near the end of the casting time, roll gaps of two roughing stands (R1 and R2) are lifted, the swing shears 4 shear the accident loop I101, the rolled piece in the later process is lifted, the waste blank sheared by the swing shears is conveyed to a waste blank pushing and stacking device 5 area, the waste blank is pushed out of a rolling line, the casting time is finished, and the accident loop I101 returns.
For endless rolling production, rolled pieces are easy to have steel piling or breaking accidents in a rolling line, so that the accident treatment of the production line needs to consider in time, and also needs to ensure that the current steel ladle and molten steel are poured continuously as far as possible, so that the loss is reduced. Therefore, the utility model discloses consider the accident treatment plan of rolling line as follows:
when the accident appears in the finish rolling area and the process after finish rolling, as shown in fig. 3, the finish rolling rack is lifted to form a roll gap, continuous casting is not stopped, but the accident shears 10 and the pendulum shears 4 need to be started for shearing simultaneously, meanwhile, the accident loop I101 and the accident loop II 102 are lifted rapidly, a waste material stacking area under the accident loop is made out, the accident shears 10 breaks the rolled piece between the pendulum shears 4 and the accident shears 10, the rolled piece is stacked to the waste material stacking area under the accident loop, and then the rolled piece is lifted away by a travelling crane or pushed out by a waste pushing device for processing a rolled line. The pendulum shears 4 still carry out fixed-length shearing on the intermediate blank I502 after rough rolling and push the intermediate blank out of the rolling line by a steel pushing device. After the accident is processed, the accident loop I101 and the accident loop II 102 return to the original positions and are rolled again by threading.
When an accident occurs in the area before and after pre-finish rolling, as shown in fig. 4, the pre-finish rolling stand is lifted to form a roll gap, continuous casting and continuous casting are carried out, the accident shears 10 rapidly cut off the intermediate billet II 503, the accident loop II 102 is lifted, and the rolling completion of a subsequent finish rolling area is ensured; meanwhile, the swing shears 4 cut off the intermediate billet I502, the accident loop I101 is rapidly lifted to give way to a waste pushing area, the swing shears 4 continue to shear the intermediate billet I502 in a fixed length mode, then the waste billet pushing device pushes out a rolling line, the accident area is subjected to accident treatment in a pre-finish rolling mode, and after the accident treatment is finished, the accident loop I101 and the accident loop II 102 are reset and rolled in a threading mode again.
When an accident occurs in the rough rolling area, as shown in fig. 5, the casting of the continuous casting machine 1 needs to be stopped suddenly, the rough rolling frame is lifted to form a roll gap, the swing shears 4 cut off the intermediate billet I502, the accident loop I101 is lifted rapidly, the rolling of the strip in the later process is guaranteed to be completed, the strip is made to pass out of a waste area, and the casting is started again and the strip is rolled in a threading manner after the accident treatment of the rough rolling area is completed.
The following is a detailed description of the process flow of the present invention for producing a strip 504 by the austenite rolling and ferrite rolling processes, respectively.
The strip steel comprises the following chemical components in percentage by mass: less than or equal to 0.05 percent of C, less than or equal to 0.15 percent of Mn, less than or equal to 0.035 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than 0.08 percent of Nb and Ti, less than or equal to 0.05 percent of Als, and the balance of Fe and impurities.
The austenite rolling process flow comprises the following steps: the molten steel is cast into a continuous casting blank 501 with the thickness of 95mm through a high-speed continuous casting process, the continuous casting drawing speed is controlled to be 5.5m/min, the surface temperature of the casting blank at the outlet of continuous casting is 1030 +/-10 ℃, then the surface of the casting blank is roughly descaled through high-pressure water, the surface iron scale of the casting blank is removed, the rough rolling temperature is about 1000 +/-10 ℃, the intermediate blank I502 with the thickness of 23mm is formed after being rolled by 2 rough rolling frames (R1 and R2), and the temperature is slightly reduced to 980 +/-10 ℃. Cooling by air cooling until the inlet temperature of a heating device I6 is 920 +/-10 ℃, supplementing the temperature to 1050 +/-10 ℃ by 8 groups of induction heaters, descaling by a high-pressure water descaling device 7, then entering a pre-finishing mill group 8 for rolling, wherein the inlet temperature of the pre-finishing mill group 8 is 980 +/-10 ℃, the outlet temperature of the pre-finishing mill group 8 is 940 +/-10 ℃, continuously rolling by two pre-finishing mill frames (M1 and M2) to obtain a 4.6mm intermediate billet II 503, cooling by air cooling until the inlet temperature of the heating device II 9 is 930 +/-10 ℃, supplementing the temperature to 1130 +/-10 ℃ by 8 groups of induction heaters, removing scales by an air cooling and high-pressure water finishing descaling device 11, finishing the strip steel 504 with the thickness of 1.0mm after continuously rolling by 4 groups of finish mill frames (F1, F2, F3 and F4) at the inlet temperature of a first finish rolling frame F1 with the air cooling and high-pressure water finishing descaling device 11, the outlet temperature of the strip steel 504 is 8.7M/s and 850 +/-10 ℃, the temperature of the strip steel 504 at the inlet of the coiler is 660 +/-10 ℃ by controlling the ultra-fast cooling and laminar cooling after rolling.
The ferrite rolling process flow comprises the following steps: the molten steel is cast into a continuous casting blank 501 with the thickness of 95mm through a high-speed continuous casting process, the continuous casting drawing speed is controlled to be 5.5m/min, the surface temperature of the casting blank at the outlet of continuous casting is 1030 +/-10 ℃, then the surface scale of the casting blank is roughly removed through high-pressure water, the rough rolling temperature is about 1000 +/-10 ℃, the thickness of the casting blank is changed into an intermediate blank I502 with the thickness of 23mm after 2 rough rolling frames (R1 and R2) are roughly rolled, and the temperature is slightly reduced to 980 +/-10 ℃. Cooling by air cooling until the inlet temperature of a heating device I6 is 920 +/-10 ℃, supplementing the temperature to 1050 +/-10 ℃ by 8 groups of induction heaters, descaling by a high-pressure water descaling device 7, then entering a pre-finishing mill group 8 for rolling, wherein the inlet temperature of the pre-finishing mill group 8 is 980 +/-10 ℃, the outlet temperature of the pre-finishing mill group 8 is 940 +/-10 ℃, the thickness of the pre-finishing mill group 8 is changed into a 4.6mm intermediate billet II 503 after continuous rolling by two pre-finishing mill frames (M1 and M2), cooling by air cooling until the inlet temperature of a heating device II 9 is 930 +/-10 ℃, supplementing the temperature to 1050 +/-10 ℃ by 8 groups of induction heaters, removing scales by air cooling and high-pressure water finishing descaling device 11, rolling at the inlet temperature of a finishing first frame F1 of 900 +/-10 ℃, rolling by F1, the thickness of a rolled piece is 2.84mm, the speed is 2.7M/s, cooling by air cooling, the inlet temperature of a finishing second frame F2 of 870 +/-10 ℃, entering an iron body area, and rolling the steel strip by a second finish rolling machine frame F2, a third finish rolling machine frame F3 and a fourth finish rolling machine frame F4 to obtain the steel strip 504 with the thickness of 1.0mm, wherein the accumulated deformation of a ferrite deformation area is 64.8%, the speed of the steel strip 504 at a finish rolling outlet is 8.7m/s, the temperature of the finish rolling outlet is 770 +/-10 ℃, the cooling mode after rolling is controlled, layer cooling is not used, and a heat-preserving cover is adopted in a layer cooling area, so that the temperature of the steel strip 504 at the inlet of a coiling machine is 650-680 ℃. After the process is carried out, the ferrite subjected to rolling deformation is recrystallized and softened in the coiling process, so that the yield ratio can be effectively reduced to be below 0.76.
Table 2 shows a certain continuous casting and rolling production line, and the strip steel comprises the following chemical components in percentage by mass: the product performance of the 2.75mm strip steel produced by adopting the process system shown in the table 1 respectively at the temperature of the austenite-ferrite transformation point of 850 ℃ is less than or equal to 0.045% of C, less than or equal to 0.03% of Si, less than or equal to 0.15% of Mn, less than or equal to 0.02% of P, less than or equal to 0.008% of S and less than or equal to 0.04% of Als, and the yield ratio of the strip steel 504 can be obviously reduced by adopting the ferrite rolling process.
TABLE 1
TABLE 2
| Type of rolling | Tensile strength (MPa) | Yield strength (MPa) | Yield ratio | Elongation (%) |
| Rolling of austenite | 371 | 288 | 0.78 | 39 |
| Ferrite rolling | 334 | 215 | 0.65 | 38 |
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, 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 or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (5)
1. A thin strip steel continuous casting and rolling endless rolling production line is characterized by comprising a continuous casting machine, a rough rolling unit, a pendulum shear, a waste billet pushing and stacking device, a heating device I, a pre-finishing rolling unit, a heating device II, an accident shear, a finishing rolling unit, an ultra-fast cooling device, a laminar cooling device, a high-speed flying shear and a coiling unit which are sequentially connected, wherein the heating device I realizes temperature compensation of an intermediate billet I after rough rolling, the heating device II realizes temperature switching required by austenite rolling and ferrite rolling of the intermediate billet II, the rough rolling unit comprises two or more rough rolling frames which are sequentially arranged along the rolling direction, the pre-finishing rolling unit comprises two or more pre-finishing rolling frames which are sequentially arranged along the rolling direction, the finishing rolling unit comprises 3-4 finish rolling frames which are sequentially arranged along the rolling direction, and the coiling unit comprises two or more coiling machines which are sequentially arranged along the rolling direction, the distance between the outlet of the continuous casting machine and the center line of the first rough rolling stand along the rolling direction is 5-8 m, the distance between the center lines of the adjacent rough rolling stands, the adjacent pre-finish rolling stands and the adjacent finish rolling stands is 4-5 m, and the distance between the center lines of the last finish rolling stand along the rolling direction and the first coiling machine along the rolling direction is not more than 60 m.
2. The thin strip continuous casting and rolling endless rolling production line according to claim 1, characterized in that a high-pressure water rough descaling device, a high-pressure water descaling device, and a high-pressure water finishing descaling device are provided at the inlets of the roughing mill group, the prefinishing mill group, and the finishing mill group, respectively.
3. The thin strip steel continuous casting and rolling endless rolling production line of claim 1, characterized in that the slab ejecting and stacking device is provided with an accident loop i, and the accident shears is provided with an accident loop ii.
4. The thin strip continuous casting and rolling endless rolling production line of claim 1, characterized in that the heating device i is a gas furnace or an induction heater, and the heating device ii is also a gas furnace or an induction heater.
5. The thin strip steel continuous casting and rolling endless rolling production line of claim 1, wherein the roughing stand employs a push-up hydraulic roll gap adjustment technique, i.e., the lower roll is pushed up by a hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021935129.9U CN212442556U (en) | 2020-09-07 | 2020-09-07 | Thin strip steel continuous casting and rolling endless rolling production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021935129.9U CN212442556U (en) | 2020-09-07 | 2020-09-07 | Thin strip steel continuous casting and rolling endless rolling production line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212442556U true CN212442556U (en) | 2021-02-02 |
Family
ID=74473788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021935129.9U Active CN212442556U (en) | 2020-09-07 | 2020-09-07 | Thin strip steel continuous casting and rolling endless rolling production line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212442556U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113042541A (en) * | 2021-02-25 | 2021-06-29 | 首钢京唐钢铁联合有限责任公司 | Control method and system for continuous casting and rolling production line |
| CN113927247A (en) * | 2021-08-30 | 2022-01-14 | 浙江威罗德汽配股份有限公司 | Heat insulation partition plate of automobile exhaust pipe and preparation method thereof |
| CN114618886A (en) * | 2022-03-14 | 2022-06-14 | 中冶赛迪工程技术股份有限公司 | Fault processing method after swing shearing of continuous casting and rolling of thin slab |
| CN114713634A (en) * | 2022-03-14 | 2022-07-08 | 中冶赛迪工程技术股份有限公司 | Fault processing method after swing shearing of continuous casting and rolling of thin slab |
-
2020
- 2020-09-07 CN CN202021935129.9U patent/CN212442556U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113042541A (en) * | 2021-02-25 | 2021-06-29 | 首钢京唐钢铁联合有限责任公司 | Control method and system for continuous casting and rolling production line |
| CN113927247A (en) * | 2021-08-30 | 2022-01-14 | 浙江威罗德汽配股份有限公司 | Heat insulation partition plate of automobile exhaust pipe and preparation method thereof |
| CN114618886A (en) * | 2022-03-14 | 2022-06-14 | 中冶赛迪工程技术股份有限公司 | Fault processing method after swing shearing of continuous casting and rolling of thin slab |
| CN114713634A (en) * | 2022-03-14 | 2022-07-08 | 中冶赛迪工程技术股份有限公司 | Fault processing method after swing shearing of continuous casting and rolling of thin slab |
| CN114618886B (en) * | 2022-03-14 | 2023-12-15 | 中冶赛迪工程技术股份有限公司 | Fault processing method after swing shearing of continuous casting and rolling of sheet billet |
| CN114713634B (en) * | 2022-03-14 | 2023-12-15 | 中冶赛迪工程技术股份有限公司 | Fault processing method after swing shearing of continuous casting and rolling of sheet billet |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112024595B (en) | Thin strip steel continuous casting and rolling endless rolling method and rolling production line thereof | |
| CN212442556U (en) | Thin strip steel continuous casting and rolling endless rolling production line | |
| CN107597845B (en) | Method and device for rolling ferrite of ultralow-carbon steel coil for endless continuous casting and rolling ultra-deep drawing | |
| CN109226257B (en) | Method for rolling plate by steckel mill and production line thereof | |
| CA1322479C (en) | Method and apparatus for the manufacture of formable steel strip | |
| CN101391264B (en) | Technique method of thin middle plate continuous casting and rolling production | |
| US20220152674A1 (en) | Endless hot-rolled strip production device and method for ferrite rolling | |
| KR101809108B1 (en) | Method and plant for the energy-efficient production of hot steel strip | |
| US20090301157A1 (en) | Method of and apparatus for hot rolling a thin silicon-steel workpiece into sheet steel | |
| CN100540708C (en) | High strength ship hull structure use steel and coiled sheet production method thereof | |
| CN101293259A (en) | Method for producing variational format/constant format ultra-thin hot-rolled strip steel by using semi-headless technique | |
| CN108526221A (en) | A kind of mild steel continuous casting and rolling production line and its production technology | |
| CN114273425B (en) | Continuous casting and rolling production line and production method for avoiding ferrite rolling mixed crystals | |
| CN109433826A (en) | Medium thin slab continuous casting and rolling unit and its production method | |
| CN111167858A (en) | Method for headless rolling of ferrite area of ultrathin strip steel | |
| CN208542737U (en) | A kind of mild steel continuous casting and rolling production line | |
| CN111589865B (en) | Low-yield-ratio thin strip steel continuous casting and rolling production line and production process | |
| CN1978080A (en) | Band-steel producing process EPS | |
| CN113857242B (en) | Continuous casting and rolling production line and ferrite rolling low-carbon steel production method thereof | |
| CN110090861B (en) | Endless rolling method for simple section steel | |
| JP2022107666A (en) | Plant and method for multimode manufacturing metal band material and plate material | |
| CN111842483B (en) | Multi-mode energy-saving hot-rolled strip steel production line and using method thereof | |
| CA2242728A1 (en) | Process for the hot rolling of steel bands | |
| CN106244916A (en) | High-quality Thin Specs hot rolled alloy tool steel and CSP production technology thereof | |
| CN110695083A (en) | Production equipment for non-heating high-strength steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |