CN109226257B

CN109226257B - Method for rolling plate by steckel mill and production line thereof

Info

Publication number: CN109226257B
Application number: CN201810941781.2A
Authority: CN
Inventors: 陈育生; 姚平
Original assignee: Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
Current assignee: Wuhan Iron and Steel Group Kunming Iron and Steel Co Ltd
Priority date: 2018-08-17
Filing date: 2018-08-17
Publication date: 2019-12-17
Anticipated expiration: 2038-08-17
Also published as: CN109226257A

Abstract

The invention discloses a method for rolling plates by a steckel mill and a production line thereof. The method for rolling the plate by the steckel mill comprises the steps of heating, removing the oxide of the plate blank, rolling the intermediate blank or the thick plate, finish rolling the furnace coil, cooling the strip steel and coiling the strip steel. Through reasonable equipment configuration and process flow, the production line and the number of rolling mills are greatly reduced, the length of the production line is shortened, a high-quality wide hot rolled strip coil and a hot rolled steel coil with a thinner limit thickness can be produced by adopting a longitudinal rolling process, and a medium plate and a thick plate which are wider than the wide hot rolled strip coil by more than 1.6 times can be produced by adopting a transverse rolling process; the wide strip rolling device can be suitable for rolling of different wide strip rolling plates, the utilization rate of blanks is improved, rolled products are various in types, and the rolling quality is high and stable.

Description

Method for rolling plate by steckel mill and production line thereof

Technical Field

the invention belongs to the technical field of metallurgical rolling, and particularly relates to a method for rolling a plate by a steckel mill and a production line thereof.

background

the modern steckel mill production line is characterized in that a coiling furnace is respectively arranged at the inlet and the outlet of a reversible four-high mill. The strip steel can enter a coiling furnace for heat preservation and storage after being thinned in the rolling process, and is coiled and rolled in a reciprocating manner, so that the temperature drop of the strip steel is reduced. Modern steckel mills are used not only for rolling special steel grades such as stainless steel, but also for rolling other steel grade products such as carbon steel, low alloy steel and the like. Compared with a hot continuous rolling production line, the steckel mill production line has the advantages of low investment, small occupied area and more flexible yield and variety. The existing steckel mill production line process and arrangement form mainly have the following five concrete expressions of three types, wherein the types are respectively: the rough and finish rolling type of the steckel mill, the rough rolling and medium rolling and finish rolling type of the steckel mill are shown as follows:

I, steckel mill rough and finish rolling type

1) a single-stand arrangement type steckel mill production line is a four-roll reversible steckel mill with 1 stand roll, rough rolling and finish rolling are carried out on one stand, and the product is mainly a hot rolled coil. The rolling passes are multiple, the number of times that the head and the tail of the strip steel enter the coiling furnace is only half of that of the middle part of the strip, the temperature drop of the head and the tail is large, the difficulty of rolling thin specifications is very large, and the surface quality of the strip steel is not high.

2) the double-stand tandem compact arrangement type steckel mill production line is a double-stand four-roller reversible steckel mill, and is characterized in that two horizontal stands are arranged between two coiling furnaces to form compact tandem arrangement, so that a comprehensive process effect of double-single stand reversible rolling and tandem rolling tension control is formed. Compared with the traditional single-stand steckel mill, the single-stand steckel mill has two advantages that one is that the rolling period is greatly shortened, the efficiency is improved, the heat preservation and retention time of 50 percent of strip materials in a coiling furnace is shortened, and the secondary surface oxidation of the strip materials is effectively reduced; and secondly, the rolling mill is compact and tandem to form a continuous rolling relation, tension can be generated between two frames and between the rolling mill and the coiling furnace, and the tension is favorable for controlling the plate shape compared with a single frame. But the rough rolling and the finish rolling are still carried out on two racks simultaneously, and in order to ensure the larger rolling speed of the finished product pass of the rolling mill in the finish rolling stage, the configured rated rolling moment of the rolling mill is smaller; the large reduction of each pass in the rough rolling stage and the large rolling moment required by rough rolling cannot be considered, and the number of rough rolling passes is large; the deformation temperature of the rolled thin specification is still lower, the difficulty is still higher, and the surface quality of the strip is not high.

II, rough rolling and finishing rolling type of steckel mill

1) 1+1 roughing mill +1 steckel mill finish rolling type steckel mill production line, namely 1 four-high reversible roughing mill with auxiliary vertical rolls +1 four-high reversible steckel mill, wherein the roughing and finish rolling functions are separated, and the surface quality of the product is improved; and is favorable for optimizing and distributing the rolling load of the rough rolling mill and the finish rolling mill. However, the steckel mill has more reversible rolling passes, the heat preservation times of the strip steel entering the coiling furnace are still more, more secondary iron scales are generated, the times of the head and the tail of the strip steel entering the coiling furnace are only half of the times of the head and the tail of the strip steel entering the coiling furnace, the temperature difference between the head and the tail of the strip steel and the middle of the strip steel is still larger, the difficulty of rolling thinner specifications is still larger, and the surface quality is still not ideal.

2) 1+2 of a 1-frame roughing mill and 2-frame Steckel mill finish rolling type Steckel mill production line, namely 1 four-roller reversible roughing mill with auxiliary vertical rollers and a two-frame Steckel finishing mill, wherein the roughing and finishing functions are separated, the finishing pass time of the Steckel mill is reduced by half, the surface quality of a product is improved, and the plate shape control is improved; and is favorable for optimizing and distributing the rolling load of the rough and finish rolling mills; the rolling time is short, the efficiency is further improved, and the rolling quantity and the stability of thinner varieties are increased.

III, rough rolling, medium rolling of steckel mill and finish rolling

1+1+3 of 1 roughing mill, 1 of steckel mill, a middle rolling mill and 3 of finishing mill, namely 1 of four-roller reversing roughing mill with auxiliary vertical rollers, 1 of four-roller reversing steckel mill and 3 of finishing mill groups, wherein the functions of roughing, middle rolling and finishing are separated, and the dimensional precision and the surface quality of a product are improved; and the rolling load of the rough, medium and finish rolling mills is more perfectly and optimally distributed, and the rolling quantity and the stability of thinner varieties are increased. The method is suitable for producing hot-rolled steel coils such as stainless steel with a narrow deformation temperature range, and has high production efficiency and yield. However, the number of rolling mills is large, the production line length is long, and the investment is large, which is close to the level of a semi-continuous rolling mill and a continuous rolling mill.

Nevertheless, there is still a need and desire to keep the number of rolling mills as small as possible, to have shorter production line lengths, and to keep the investment low; it is desirable to be able to produce a greater variety of higher quality sheet products. The expected diversified varieties comprise common structural steel varieties, special steel varieties such as stainless steel and the like, and advanced high-strength steel varieties; meanwhile, the varieties comprise wide steel coil products, wider medium and thick plate products.

Disclosure of Invention

the first purpose of the invention is to provide a method for rolling plates by a steckel mill, which can adopt a longitudinal rolling process to produce high-quality wide hot rolled strip coils through reasonable equipment configuration and process flow; and can also adopt the cross rolling process to produce the medium plate and the thick plate which are wider than the wide hot rolled strip coil by more than 1.6 times.

The first object of the present invention is achieved by: the method comprises the steps of A, heating, B, removing oxides of a plate blank, C, rolling an intermediate blank or a thick plate, D, finish rolling a furnace coil, E, cooling a strip steel, and F, coiling the strip steel;

A. heating, namely feeding the plate blank into a heating furnace to be heated to the temperature range of 1100 ℃ and ~ 1280 ℃, discharging the heated plate blank onto a discharging roller way, and turning to the step B, wherein the plate blank comprises a short blank and a long blank;

B. removing oxides from the plate blank, namely adjusting and centering the plate blank conveyed and operated by the discharging roller by using a centering device adjusting device, and then conveying the plate blank into a plate blank high-pressure water descaling device, wherein the plate blank high-pressure water descaling device sprays high-pressure water to remove the oxides on the upper surface and the lower surface of the plate blank, and conveys the plate blank with the oxides removed to a thick plate horizontal rolling mill to perform thick plate or intermediate blank rolling work; turning to the step C;

C. Rolling an intermediate blank or rolling a thick plate,

C1, rolling the thick plate, wherein the rolling comprises the following steps:

c101, rolling a thick plate, namely firstly selecting a short plate blank as a plate blank for heating in the step A, secondly carrying out oxide removal treatment on the heated plate blank in the step B, conveying the plate blank treated in the step B through a thick plate pusher to carry out 90-degree turning and centering adjustment on the plate blank so that the width direction of the plate blank is consistent with the rolling direction, then conveying the plate blank into a thick plate horizontal rolling mill for reciprocating rolling for 3 ~ 7 times so that the plate blank is transversely rolled into a thick plate with the target thickness of 12 ~ 50mm along the width direction of the plate blank, trimming and controlling the width of the plate blank through a thick plate vertical rolling mill in the rolling process so as to ensure that the head and the tail of the thick plate are consistent with the middle rolling width, and in the rolling process of the thick plate, opening a scale removal nozzle of a thick plate laminar flow rolling mill and a scale removal device to remove secondary oxidized iron sheets, or opening a laminar flow nozzle of the thick plate rolling mill and a laminar flow nozzle of the scale removal device to carry out temperature reduction treatment on the intermediate plate blank so that the rolling temperature of the intermediate blank meets the requirements of the deformation temperature of the TMCP thermomechanical rolling process of ~ 1000 ℃ so as to meet;

c102, cooling the thick plate, namely conveying the thick plate with the thickness of 12 ~ 50mm obtained by the treatment in the step C101 to a thick plate cooling control device for cooling, uniformly spraying water on the upper surface and the lower surface of the thick plate by the thick plate cooling control device for cooling, wherein the thick plate cooling control device meets the cooling process requirement of the TMCP, so that the thick plate reaches the target straightening temperature of ~ 1000 ℃ at 450 ℃, and turning to the step C103 after the thick plate is cooled;

C103, outputting the thick plate, conveying the thick plate obtained by the treatment in the step C102 to a correcting device for correcting and straightening, cutting the length of the thick plate into a thick plate semi-finished product, and turning to the step C104;

c104, thick plate finishing, namely, conveying the thick plate semi-finished product obtained by the treatment in the step C103 to a cold bed from a conveying roller way through a steel moving turning plate rack, then conveying the thick plate semi-finished product to a roller way from an outlet of the cold bed, conveying the thick plate semi-finished product to a subsequent thick plate finishing area, and carrying out fixed-length shearing, trimming, cold straightening, inspection and nondestructive testing on the thick plate semi-finished product to obtain a thick plate finished product;

C2, rolling an intermediate blank, namely firstly selecting a long blank as a blank for heating in the step A, secondly carrying out oxide removal treatment on the heated blank in the step B, conveying the blank treated in the step B to a thick plate pusher for slab centering adjustment, conveying the blank subjected to centering adjustment into a thick plate horizontal rolling mill for reciprocating rolling for 2 ~ times, rolling the blank into an intermediate blank with the thickness of less than 35mm, and carrying out finish rolling in the step D;

D. the furnace coil is subjected to finish rolling,

d101, conveying the intermediate blank processed in the step C2 to flying shears, firstly removing the head and the tail of the intermediate blank by the flying shears, and then conveying the intermediate blank to pass through the lower part of a first coiling furnace for closing a furnace door; turning to step D102;

D102, adjusting and centering the intermediate blank by a first steckel mill pusher, and then sequentially biting into a first steckel horizontal rolling mill and a second steckel horizontal rolling mill; after the strip steel rolled by the intermediate billet comes out of the second furnace coil horizontal rolling mill, the strip steel is adjusted and centered by a push bed of the second furnace coil rolling mill, then is clamped and conveyed by a second pinch roll scissor, enters the second coiling furnace through a laid furnace door and is aligned with a jaw of a winding drum, when the strip head of the strip steel rolled by the intermediate billet is inserted into the jaw of the winding drum for a certain length, the winding drum of the second coiling furnace, the first furnace coil horizontal rolling mill and the second furnace coil horizontal rolling mill are started, and synchronously rotate and rise the speed, so that the jaw of the winding drum of the second coiling furnace clamps the end part of the strip steel rolled by the intermediate billet, and the winding drum tightly wraps the strip steel to establish tension; turning to step D103;

d103, the second pinch roll scissors move and rise to the guiding and tension balancing working position, so that the strip steel rolled by the intermediate billet 28 is insulated and rolled in a second coiling furnace; turning to step D104;

d104, when the tail of the strip steel rolled by the intermediate blank is close to the inlet of the second furnace coil horizontal rolling mill, synchronously reducing the speed of the first furnace coil horizontal rolling mill, the second furnace coil horizontal rolling mill and the second coiling furnace; turning to step D105;

D105, stopping the rolling mill when the tail of the strip steel rolled by the intermediate blank is rolled to the roll gap position of the second furnace coil horizontal rolling mill, finishing the rolling work of the first furnace coil, and turning to the step D106; in the process of rolling the furnace coil once, the finishing adjustment of the vertical roller mill of the furnace coil controls the width of the intermediate billet;

d106, controlling a second pinch roll shear to immediately clamp the strip steel rolled from the intermediate blank, and synchronously and reversely operating with a second coil horizontal rolling mill and a second coiling furnace, wherein the strip tail of the previous pass is changed into a pass strip head, and the strip head of the previous pass is changed into a pass strip tail; the head of the conveyed strip steel is adjusted and centered by a second steckel mill pusher, then is sequentially meshed into a second steckel horizontal rolling mill and a first steckel horizontal rolling mill, after the head of the strip steel is discharged out of the first steckel horizontal rolling mill, is adjusted and centered by a first steckel horizontal rolling mill pusher, then is clamped and conveyed by a first pinch roll scissor, enters a first coiling furnace through a laid-down furnace door and is aligned with a reel jaw, when the strip steel head is inserted into the reel jaw for a certain length, the first coiling furnace, the first steckel horizontal rolling mill, the second steckel horizontal rolling mill and the second coiling furnace are started to synchronously rotate and raise the speed, so that the reel jaw of the first coiling furnace clamps the tail of the strip steel, and meanwhile, the reel tightly wraps the strip steel to establish tension; turning to step D107;

D107, lifting the first pinch roll scissors and the second pinch roll scissors to a guiding and tension balancing working position, and keeping the temperature of the strip steel in the first coiling furnace and the second coiling furnace and rolling the strip steel; turning to step D108;

d108, when the end part of the strip steel rolled by the intermediate blank is rolled to be close to the first furnace coil horizontal rolling mill, synchronously reducing the speed of the first coiling furnace, the first furnace coil horizontal rolling mill, the second furnace coil horizontal rolling mill and the second coiling furnace; when the tail part of the strip steel rolled by the intermediate blank is rolled to the position of a roller gap of a first furnace coil finish rolling horizontal rolling mill, stopping the rolling mill to finish the rolling work of the second furnace coil; turning to step D109;

D109, next reverse rolling is started, the rolling sequence of the step D102 ~ D109 is repeated, and the rolling is repeated for multiple passes in this way until the intermediate blank is rolled into an odd number of final passes of finished strip steel with the thickness of 1.5 ~ mm, the strip steel rolled out at the final pass passes through a second coiling furnace with a closed furnace door and is conveyed to a strip steel rolling post-cooling device to become semi-finished strip steel, and the step E is carried out for cooling;

E. Cooling the strip steel, conveying the semi-finished product of the strip steel obtained by the treatment of the step D109 to a strip steel rolling cooling device, and uniformly spraying water to cool the upper surface and the lower surface of the strip steel to ensure that the strip steel of the semi-finished product meets the deformation temperature requirement of the rolling process and reaches the target coiling temperature of ~ 700 ℃ to form the finished product of the strip steel so as to obtain good comprehensive mechanical properties of metal, and the strip steel rolling cooling device meets the cooling process requirement of strip steel TMCP;

F. And E, coiling the strip steel, namely, the finished product of the strip steel which is cooled to the required coiling temperature range through the treatment of the step E is subjected to surface quality detection, is adjusted and centered by a centering device and then enters a coiling machine to be coiled into a steel coil.

the second purpose of the invention is to provide a production line for rolling plates of a steckel mill, which is suitable for rolling wide-strip coils, special wide-width thick plates and different types of steel.

the second object of the present invention is achieved by: the device comprises a heating furnace, a discharge roller way, a slab high-pressure water descaling device, a thick plate push bed, a thick plate mill laminar flow and descaling device, a thick plate horizontal mill, a thick plate vertical mill, a thick plate controlled cooling device, a correcting device, a flying shear, a first coiling furnace, a first pinch roll shear, a first steckel mill laminar flow and descaling device, a first steckel mill push bed, a first steckel mill, a looper, a second steckel mill horizontal mill, a second steckel mill push bed, a second steckel mill laminar flow and descaling device, a second pinch roll shear, a second coiling furnace, a strip steel post-rolling cooling device, a centering device and a coiling machine; a discharge roller way is arranged at the discharge port of the heating furnace, a slab high-pressure water descaling device is arranged at one end of the discharge roller way, and the slab high-pressure water descaling device is sequentially connected with a thick plate horizontal rolling mill, a thick plate vertical rolling mill, a thick plate controlled cooling device and a correcting device through a conveying roller way; wherein, a thick plate push bed, a thick plate mill laminar flow and descaling device and a thick plate push bed are sequentially arranged between the slab high-pressure water descaling device and the thick plate horizontal rolling mill, and a thick plate mill laminar flow and descaling device and a thick plate push bed are sequentially arranged between the thick plate vertical rolling mill and the thick plate controlled cooling device; the other end of the discharging roller way is provided with a flying shear, the flying shear is sequentially connected with a first coiling furnace, a first pinch roll shear, a first steckel mill laminar flow and descaling device, a first steckel mill push bed, a first steckel mill horizontal mill and a steckel mill through a conveying roller way, the steckel mill is sequentially connected with a loop roll, a second steckel mill horizontal mill, a second steckel mill push bed, a second steckel mill laminar flow and descaling device, a second pinch roll shear and a second coiling furnace through the conveying roller way, and the second coiling furnace is sequentially connected with a steel rolling aftercooling device and a coiling machine through the conveying roller way.

compared with the prior art, the invention has the following technical effects:

1. The equipment configuration type of a heavy plate mill and a double-frame coil finishing mill is adopted, the rolling width of the heavy plate mill is 800 ~ 1000mm larger than that of the traditional coil finishing mill, and the width ratio is more than 1.6 times;

2. When the wide-strip coiled plate is rolled and produced, the thick plate rolling mill undertakes the work of rough rolling of the intermediate blank, and the furnace coil horizontal rolling mill undertakes the work of finish rolling of strip steel; the production process of finish rolling the wide-strip coil by one roughing mill and two steckel mills is also formed, which is beneficial to optimizing and distributing the rolling loads of the roughing mill and the finishing mill; the surface quality of the product is greatly improved, and the rolling quantity and stability of thinner products are increased;

3. In the production of wide-strip coiled plates, flying shears are adopted to cut off the head and tail of the defect of an intermediate billet, and then the flat rolling mill is used for finish rolling by a double-frame four-roller reversing furnace coil, so that the rolling efficiency is improved, the reversible pass in the finish rolling stage of the furnace coil and the threading times of the strip entering a coiling furnace are effectively reduced, the accident rate is reduced, the oxidation time of the strip steel in the coiling furnace is shortened, and the surface quality and the yield of the strip steel are ensured;

4. the wide-strip coiled plate is made of a continuous casting plate blank with the same width, the length of the plate blank can be more than 10m, the plate blank is longitudinally rolled along the length of the plate blank, the finished product coil is heavy, and the efficiency is high;

5. The wider heavy plate mill can roll back and forth in the turning direction of a short slab and roll transversely in the width direction of the slab to produce wider medium and thick plate products. The use of wider continuous casting plate blank raw materials is avoided, and more smelting and continuous casting investments are saved; the invention uses the plate blank with the same cross section to roll a wider thick plate which is wider than the wide-strip plate by more than 1.6 times, thereby improving the utilization rate of the blank and enlarging the effect of the product;

6. The Steckel Plate Mill (Steckel Plate Mill) not only can be suitable for producing large-width differential hot rolled Plate product varieties with the maximum width less than 3m and the maximum-minimum width ratio more than 1.6 times; the method can also be suitable for producing large-thickness differential hot rolled plate products with the thickness of about 50mm at most and the maximum-minimum thickness ratio of 25 times;

7. The Steckel Plate Mill (Steckel Plate Mill) can realize the differential rolling process of rolling different types of plates longitudinally and transversely, so that the Plate products have the corresponding physical metallurgy, mechanical property and quality characteristics related to the longitudinal rolling process and the transverse rolling process, and are not only suitable for common structural steel types with different widths, but also suitable for special and advanced varieties such as stainless steel with different widths, and the like;

8. The invention adopts a Plate Steckel Plate Mill (Steckel Plate Mill) advanced strip steel post-rolling cooling device and a thick Plate controlled cooling device, adopts the technologies of ACC accelerated cooling, UFC ultrafast cooling and LFC laminar cooling, and can respectively meet the cooling process requirements of TMCP (thermal mechanical control processing) hot-mechanical rolling of thick plates and strip steel; the method is suitable for the production process and microstructure requirements of advanced high-strength and structure plate-strip steel products such as DP dual-phase steel, CP dual-phase steel and the like, and is suitable for and meets the novel TMCP rolling cooling process requirements of other advanced high-strength steel plate strip products;

9. the sheet Steckel Plate Mill (Steckel Plate Mill) adopted in the invention simplifies the production line and the number of the mills, shortens the length of the production line, reduces the temperature loss of strip steel in the rolling process, and is beneficial to producing hot rolled steel coils with thinner limit thickness by tension rolling between the racks of the double-rack four-roller reversible furnace coil horizontal Mill.

drawings

FIG. 1 is a schematic structural view of a production line for rolling a sheet by a plate-rolling mill according to the present invention;

FIG. 2 is a schematic structural view of another embodiment of the production line for rolling plates by the plate-rolling mill of the plate furnace;

reference numbers in the figures: 1-heating furnace, 2-discharging roller table, 3-slab high-pressure water descaling device, 4-thick plate pusher, 5-thick plate mill laminar flow and descaling device, 6-thick plate horizontal rolling mill, 7-thick plate vertical rolling mill, 8-thick plate controlled cooling device, 9-straightening device, 10-flying shear, 11-first coiling furnace, 12-first pinch roll scissors, 13-first steckel mill laminar flow and descaling device, 14-first steckel mill pusher, 15-first steckel horizontal rolling mill, 16-steckel mill, 17-looper roll, 18-second steckel horizontal rolling mill, 19-second steckel mill pusher, 20-second steckel mill laminar flow and descaling device, 21-second pinch roll scissors, 22-second coiling furnace, 23-post-strip steel rolling cooling device, 24-centering device, 25-coiling machine, 26-wrapper roll, 27-plate blank, 28-intermediate blank, 29-thick plate and 30-strip steel.

Detailed Description

the invention is further described with reference to the accompanying drawings, but the invention is not limited in any way, and any alterations or substitutions based on the teaching of the invention are within the scope of the invention.

a method for rolling a plate by a steckel mill comprises the steps of A, heating, B, removing oxides of a plate blank, C, rolling an intermediate blank or rolling a thick plate, D, finish rolling of a furnace coil, E, cooling of a strip steel, and F, coiling of the strip steel;

A. heating, namely feeding the plate blank 27 into a heating furnace 1 to be heated to the temperature range of 1100 ℃ ~ 1280 ℃, discharging the heated plate blank 27 onto a discharging roller table 2, and turning to the step B, wherein the plate blank 27 comprises a short blank and a long blank, when the plate blank 27 is the short blank and is heated, two rows or three rows of cloth are arranged in the heating furnace 1, and single rows of cloth are respectively discharged;

B. Removing the oxide of the plate blank, namely adjusting and centering the plate blank 27 conveyed and operated by the discharging roller table 2 by adopting a centering device adjusting device, then sending the plate blank into a plate blank high-pressure water descaling device 3, spraying high-pressure water by the plate blank high-pressure water descaling device 3 to remove the oxide on the upper surface and the lower surface of the plate blank 27, and conveying the plate blank 27 with the oxide removed to a thick plate horizontal rolling mill 6 to roll a thick plate or an intermediate blank; turning to the step C;

C. rolling an intermediate blank or rolling a thick plate,

c1, rolling the thick plate, wherein the rolling comprises the following steps:

c101, rolling the thick plate, namely firstly selecting a short plate as a plate blank 27 for heating in the step A, secondly carrying out oxide removal treatment on the heated plate blank 27 in the step B, then conveying the plate blank 27 treated in the step B to pass through a thick plate pusher 4 to carry out 90-degree turning and centering adjustment on the plate blank 27 so that the width direction of the plate blank 27 is consistent with the rolling direction, then conveying the plate blank 27 into a thick plate horizontal rolling mill 6 for carrying out reciprocating rolling for 3 ~ passes so that the plate blank 27 is transversely rolled into a thick plate 29 with the target thickness of 12 ~ mm along the width direction of the plate blank, and in the rolling process, finishing and controlling the width of the plate blank 27 through a thick plate vertical rolling mill 7 so as to ensure that the head and the tail of the thick plate are consistent with the rolling width of the middle part of the thick plate;

c102, cooling the thick plate, namely conveying the thick plate 29 with the thickness of 12 ~ 50mm obtained by the treatment in the step C101 to a thick plate cooling control device 8 for cooling, uniformly spraying water on the upper surface and the lower surface of the thick plate 29 by the thick plate cooling control device 8 for cooling, wherein the thick plate cooling control device 8 meets the cooling process requirement of the thermal mechanical rolling of the thick plate TMCP, so that the thick plate 29 reaches the target straightening temperature of 450 ℃ ~ 1000 ℃, and turning to the step C103 after the cooling of the thick plate 29 is completed;

C103, outputting the thick plate, conveying the thick plate 29 obtained by the treatment in the step C102 to a correcting device 9 for correcting and straightening, cutting the length of the thick plate into a thick plate 29 semi-finished product, and turning to the step C104;

C104, thick plate finishing, namely, conveying the thick plate 29 semi-finished product obtained by the treatment in the step C103 from a conveying roller way to a cooling bed through a steel moving turning plate rack, then conveying the thick plate 29 semi-finished product to a roller way from an outlet of the cooling bed, conveying the thick plate into a subsequent thick plate finishing area, and carrying out fixed-length shearing, trimming, cold straightening, inspection and nondestructive testing on the thick plate 29 semi-finished product to obtain a thick plate 29 finished product;

c2, rolling an intermediate billet, namely firstly selecting a long billet as a slab 27 for heating in the step A, secondly carrying out oxide removal treatment on the heated slab 27 through the step B, conveying the slab 27 treated in the step B to a thick plate push machine 4 for centering adjustment of the slab 27, then conveying the slab 27 subjected to centering adjustment into a thick plate horizontal rolling mill 6 for carrying out reciprocating rolling for 2 ~ 6 passes, rolling the slab 27 into the intermediate billet 28 with the thickness of less than 35mm, and carrying out finish rolling in the step D, trimming and controlling the width of the slab 27 through a thick plate vertical rolling mill 7 in the rolling process of the intermediate billet 28 so as to ensure that the head and the tail of the rolled intermediate billet 28 are consistent with the rolling width of the middle part, starting a laminar flow of the thick plate rolling mill and a descaling nozzle of a descaling device 5 to remove secondary oxidized iron sheets generated on the intermediate billet 28 in the rolling process, or starting the laminar flow of the thick plate rolling mill and the laminar flow nozzle of the descaling device 5 to carry out cooling treatment on the intermediate billet 28 so as to ensure that the temperature of the intermediate billet 28 meets the requirement of a furnace coil rolling process of ~ 1150 ℃ at 900 ℃, so as to meet the requirement of the finish rolling of the intermediate billet rolling process of TMCP rolling, and closing;

D. The furnace coil is subjected to finish rolling,

D101, conveying the intermediate blank 28 processed in the step C2 to a flying shear 10, shearing and removing the head and the tail of the intermediate blank 28 by the flying shear 10, and conveying the intermediate blank 28 to pass through the lower part of a first coiling furnace 11 with a closed furnace door; turning to step D102;

d102, adjusting and centering the intermediate blank 28 through a first steckel mill pusher 14, and then sequentially biting into a first steckel horizontal rolling mill 15 and a second steckel horizontal rolling mill 18; after the strip steel rolled by the intermediate billet 28 comes out of the second furnace coil horizontal rolling mill 18, the strip steel is adjusted and centered by a second furnace coil horizontal rolling mill push bed 19, then is clamped and conveyed by a second pinch roll scissors 21, enters the second coiling furnace 22 through a laid-down furnace door and is aligned with a reel jaw, when the strip head of the strip steel rolled by the intermediate billet 28 is inserted into the reel jaw for a certain length, the reel of the second coiling furnace 22, the first furnace coil horizontal rolling mill 15 and the second furnace coil horizontal rolling mill 18 are started and synchronously rotated and lifted, so that the reel jaw of the second coiling furnace 22 clamps the end part of the strip steel rolled by the intermediate billet 28, and the reel tightly wraps the strip steel to establish tension; turning to step D103;

d103, the second pinch roll scissors 21 run and rise to a guiding and tension balancing working position, so that the strip steel rolled by the intermediate billet 28 is subjected to heat preservation and rolling in the second coiling furnace 22; turning to step D104;

D104, when the tail of the strip steel rolled by the intermediate blank 28 is close to the inlet of the second furnace coil horizontal rolling mill 18, synchronously reducing the speed of the first furnace coil horizontal rolling mill 15, the second furnace coil horizontal rolling mill 18 and the second coiling furnace 22; turning to step D105;

d105, when the tail of the strip steel rolled by the intermediate blank 28 is rolled to the roll gap position of the second furnace coil horizontal rolling mill 18, stopping the rolling mill to complete the rolling work of the first furnace coil, and turning to the step D106; in the process of one-time furnace coil rolling, the furnace coil vertical rolling mill 16 finishes, adjusts and controls the width of the intermediate billet 28; turning to step D106;

D106, controlling the second pinch roll scissors 21 to immediately clamp the strip steel rolled by the intermediate billet 28, and synchronously and reversely operating with the second coil horizontal rolling mill 18 and the second coiling furnace 22, wherein the strip tail of the previous pass is changed into a pass strip head, and the strip head of the previous pass is changed into a pass strip tail; the head of the conveyed strip steel is adjusted and centered by a second steckel mill pusher 19, then is sequentially meshed into a second steckel horizontal rolling mill 18 and a first steckel horizontal rolling mill 15, after the head of the strip steel is discharged from the first steckel horizontal rolling mill 15, the head of the strip steel is adjusted and centered by a first steckel mill pusher 14, then is clamped and conveyed by a first pinch roll scissors 12, enters a first coiling furnace 11 through a laid-down furnace door and is aligned with a jaw of a winding drum, when the strip steel head is inserted into the jaw of the winding drum for a certain length, the first coiling furnace 11, the first steckel horizontal rolling mill 15, the second steckel horizontal rolling mill 18 and the second coiling furnace 22 are started to synchronously rotate and rise the speed, so that the winding drum of the first coiling furnace 11 clamps the tail part of the strip steel, and the winding drum is tightly wound to establish the; turning to step D107;

d107, the first pinch roll scissors 12 and the second pinch roll scissors 21 are lifted to a guiding and tension balancing working position, so that the strip steel is subjected to heat preservation and rolling in the first coiling furnace 11 and the second coiling furnace 22; turning to step D108;

d108, when the end part of the strip steel rolled by the intermediate blank 28 is rolled to be close to the first furnace coil horizontal rolling mill 15, synchronously reducing the speed of the first coiling furnace 11, the first furnace coil horizontal rolling mill 15, the second furnace coil horizontal rolling mill 18 and the second coiling furnace 22; when the tail part of the strip steel rolled by the intermediate billet 28 is rolled to the position of a roller gap of a first furnace coil finish rolling horizontal rolling mill (15), stopping the rolling mill to finish the rolling work of the second-pass furnace coil; turning to step D109;

D109, next, starting the next reverse rolling, repeating the rolling sequence of the step D102 ~ D109, and performing reciprocating rolling for multiple passes in this way until the intermediate blank 28 is rolled into an odd number of final passes of a finished strip steel 30 with the thickness of 1.5 ~ 26mm, wherein the strip steel 30 rolled out at the final pass passes through a second coiling furnace 22 with a closed furnace door and is conveyed to a strip steel rolling post-cooling device 23 to form a semi-finished strip steel 30, and turning to the step E for cooling and cooling;

E. cooling the strip steel, namely conveying the semi-finished product strip steel 30 obtained by the treatment in the step D109 to a strip steel rolling cooling device 23, uniformly spraying water to cool the upper surface and the lower surface of the semi-finished product strip steel 30 by the strip steel rolling cooling device 23 so that the semi-finished product strip steel 30 meets the deformation temperature requirement of the rolling process and reaches the target coiling temperature of 450 ℃ and ~ 700 ℃ to form the finished product strip steel 30 so as to obtain good comprehensive mechanical property of metal, and the strip steel rolling cooling device 23 meets the cooling process requirement of strip steel TMCP (thermo mechanical processing);

F. And E, coiling the strip steel, namely, the finished product of the strip steel 30 which is cooled to the required coiling temperature range through the treatment of the step E is subjected to surface quality detection, is adjusted and centered by a centering device 24 and then enters a coiling machine 25 to be coiled into a steel coil.

the descaling mode in the step B is to descale the lower surface of the slab 27, then to descale the two sides of the slab 27 and finally to descale the upper surface of the slab 27; the non-symmetrical composite slab 27 with special requirements is subjected to single-side descaling and cooling on the rolling surface of the slab 27 so as to control the buckle head bending direction of the slab 27 out of the roll gap.

in the steps C101 and C2, the thick plate edger 7 is trimmed to control the rolling width of the slab 27, so as to ensure that the rolling widths of the head, the middle and the tail of the slab 27 are consistent during rolling.

In the rolling process of the step D102 ~ D109, a first steckel mill laminar flow and descaling device 13 or a second steckel mill laminar flow and descaling device 20 is started to remove secondary oxides generated in the finish rolling process of the intermediate billet 28, and the pressure of the descaling water is 20 ~ 25Mpa, or any one of rolling mill laminar flow nozzles on the first steckel mill laminar flow and descaling device 13 and the second steckel mill laminar flow and descaling device 20 is started to cool the strip steel rolled by the intermediate billet 28, so that the strip steel rolled by the intermediate billet 28 meets the process deformation temperature requirement of the steckel mill TMCP thermomechanical rolling and the target finish rolling temperature of ~ 1000 ℃ at 700 ℃.

And in the rolling process of the step D102 ~ D105, the furnace coil vertical rolling mill 16 performs pressure reduction on the intermediate billet 28 in the width direction, controls the rolling width of the intermediate billet 28, and ensures that the widths of the head, the middle and the tail of the furnace coil finish rolling finished product strip steel 30 are consistent, and in the rolling process of the step D102 ~ D109, the loop roller 17 performs tension control on the strip steel rolled by the intermediate billet 28 between the first furnace coil horizontal rolling mill 15 and the second furnace coil horizontal rolling mill 18, so that the metal second flow between the first furnace coil horizontal rolling mill 15 and the second furnace coil horizontal rolling mill 18 is balanced, and the plate shape is improved.

when the first-furnace coil horizontal rolling mill 15 and the second-furnace coil horizontal rolling mill 18 are started to operate simultaneously, the reciprocating rolling pass is 3 ~ 5 passes.

When the first-furnace coil horizontal rolling mill 15 or the second-furnace coil horizontal rolling mill 18 is independently started to operate, the reciprocating rolling pass is 7 ~ 11 passes.

in the rolling process of the step D102 ~ D109, the furnace temperatures of the first coiling furnace 11 and the second coiling furnace 22 are not more than 1200 ℃.

In the above step F, the winding method of the strip 30 is either up-wind or down-wind.

In the step C101, the length of the short billet is not less than 1000mm and not more than 3000 mm.

in the step C1, the length of the long billet is not less than 6000mm and not more than 11000 mm.

In the step C102, the target temperature for cooling the thick plate 29 is 450 ℃ ~ 1000 ℃ to obtain the required microstructure, and finally obtain good comprehensive mechanical properties of the metal.

in the step C2, the target temperature for cooling the intermediate billet 28 is 900 ℃ to ~ 1150 ℃ so as to meet the temperature requirement of the coil finish rolling process.

And E, in the step E, cooling the strip steel, wherein the target temperature of cooling the finished product strip steel is 450 ℃ and ~ 700 ℃ to obtain a required microstructure and finally obtain good comprehensive mechanical properties of metal.

the pressure of the plate blank high-pressure water descaling device 3, the thick plate mill laminar flow and descaling device 5, the first steckel mill laminar flow and descaling device 13 and the second steckel mill laminar flow and descaling device 20 is 20 ~ 25 MPa.

according to the difference of the rolling thickness and the rolling temperature of the steel plate, the ACC accelerated cooling has the maximum cooling rate of 40 ℃/s, the UFC ultra-fast cooling has the cooling rate of 60 ~ 200 ℃/s, the LFC laminar cooling has the cooling rate less than 15 ℃/s, and during cooling, one or more modes are adopted for sectional combined cooling to achieve reasonable opening or closing of each section of cooling, so that a steel plate finished product with certain components meets the temperature requirements of physical metallurgy and mechanical metallurgy, and the required microstructure and the specific mechanical property are obtained.

the production line of the rolled plate of the plate steckel mill shown in figure 1 ~ 2 comprises a heating furnace 1, a discharge roller table 2, a slab high-pressure water descaling device 3, a thick plate push bed 4, a thick plate mill laminar flow and descaling device 5, a thick plate horizontal rolling mill 6, a thick plate edger mill 7, a thick plate controlled cooling device 8, a straightening device 9, a flying shear 10, a first coiling furnace 11, a first pinch roll shear 12, a first steckel mill laminar flow and descaling device 13, a first steckel mill push bed 14, a first steckel mill horizontal rolling mill 15, a steckel mill 16, a looper roll 17, a second steckel mill horizontal rolling mill 18, a second steckel mill push bed 19, a second steckel mill laminar flow and descaling device 20, a second steckel mill shear 21, a second coiling furnace 22, a strip steel post-cooling device 23, a centering device 24 and a coiler 25, wherein the slab leveling roll mill 14, the slab leveling device 24 and the straightening device 24 are arranged in sequence between the slab leveling roll bed 16, the slab leveling device 14, the leveling device 14 and the coiler 25 are arranged in sequence, the strip steel slab, the leveling device 14 is arranged in the strip steel slab, the strip steel slab rolling mill 14, the strip steel rolling mill 14, the leveling device 14 is arranged in the strip steel rolling mill 14, the strip rolling mill 14 is arranged in the middle slab leveling device 14, the middle leveling device 14, the strip rolling mill horizontal rolling mill 14, the leveling device 14 is arranged in the middle leveling device 14, the strip rolling mill horizontal rolling mill 14, the strip rolling mill 14 is arranged in the middle of the strip rolling mill 14, the slab rolling mill 14, the leveling device 14 is arranged in the strip rolling mill 14, the strip rolling mill 14 is arranged in the strip rolling mill 14, the strip rolling mill horizontal rolling mill 14, the strip rolling.

The thick plate horizontal rolling mill 6, the first steckel horizontal rolling mill 15 and the second steckel horizontal rolling mill 18 are double-rack four-roller reversible horizontal rolling mills, wherein the rolling width of the thick plate horizontal rolling mill 6 is not less than 1.6 times of that of the first steckel horizontal rolling mill 15, the thick plate horizontal rolling mill 6 adopts an electric pressing mode and a hydraulic pressing mode and has a roll bending function, and the hydraulic pressing mode has an HAGC hydraulic automatic thickness control function; the thick plate vertical rolling mill 7 has an automatic width control HAWC function; the first and second horizontal rolling mills 15 and 18 have the same rolling width, and the first and second horizontal rolling mills 15 and 18 both adopt electric and hydraulic pressing modes and have roll bending and roll shifting functions, wherein the hydraulic pressing mode has an HAGC hydraulic automatic thickness control function.

the width of the discharging roller table 2 is not less than the width of a conveying roller table from the discharging roller table 2 to the thick plate horizontal rolling mill 6, and the width of the conveying roller table is not less than the width of a feeding hole of the thick plate horizontal rolling mill 6 and the first steckel horizontal rolling mill 15; the thick plate push bench 4 adopts hydraulic transmission, and the thick plate push bench 4 has 90-degree steering and centering operation functions; the straightening device 9 is a thermal straightening device, and thick plate transverse cutting scissors are arranged at the inlet and/or the outlet of the straightening device 9; the thick plate controlled cooling device 8 and the strip steel rolled cooling device 23 adopt one or more combined cooling modes of ACC accelerated cooling, UEC ultrafast cooling and LEC laminar cooling.

The coil vertical rolling mill 16 is positioned between the first coil horizontal rolling mill 15 and the second coil horizontal rolling mill 18, and has an automatic width control (HAWC) function; a loop roller 17 with the functions of conveying and controlling the balance tension is arranged between the furnace coil vertical rolling mill 16 and the second furnace coil horizontal rolling mill 18.

The flying shear 10 is arranged between the discharging roller table 2 and the first coiling furnace 11; the first pinch roll scissors 12 are arranged at the position close to a strip passing furnace door of the first coiling furnace 11; the second pinch roll scissors 21 are arranged at a position close to a strip passing furnace door of a second coiling furnace 22; the coiling machine 25 is provided with at least one coiling machine, the coiling drum of the coiling machine 25 is a stepless expansion type coiling drum, and the coiling machine 25 is provided with a coiling assisting roller 26 which is matched with the coiling machine and has an automatic stepping control function.

The heating furnace 1 is a walking beam type heating furnace 1 with two or three groups of water beams, a steel loading machine is arranged at the feeding end of the heating furnace 1, a steel discharging machine is arranged at the discharging end, and the steel loading machine can load cloth in single row, two rows or three rows respectively; the tapping machine can discharge in single row in groups or discharge in single row in combination.

The plate blank high-pressure water descaling device 3 is a split structure which is respectively arranged for lower surface descaling, two side surface descaling and upper surface descaling, or an integrated structure device which is combined for lower surface descaling, upper surface descaling and two side surface descaling; and a centering guide and guard device is arranged at the inlet of the slab high-pressure water descaling device 3.

Different types of centering devices are arranged on each conveying roller way, such as a centering guide plate at the inlet side of the flying shear 10, a centering device 24 arranged at the inlet of the coiling machine 25 is a centering guide roller with hydraulic short-stroke control, such as a centering guide plate arranged at the inlet of the slab high-pressure water descaling device 3, a centering guide plate arranged at the connecting position with the width changing of the conveying roller way and the like.

The correcting device 9 is also connected with a steel moving turning plate rack, a cooling bed, a length sizing shearing knife, a trimming shear, a cold straightener, an ultrasonic flaw detection device and a stacking plate collecting device through a conveying roller way; for the subsequent thick plate finishing area, the cold shearing, the edge cutting and the like of the medium plate can adopt a flame or plasma cutting mode and the like, and more simple and convenient subsequent thick plate finishing area process and equipment are configured.

the invention is described in further detail below by way of examples:

example one

as shown in figure 1, when a first furnace coil horizontal rolling mill 15 and a second furnace coil horizontal rolling mill 18 are started simultaneously to operate rolling to produce coil plates, a plate blank 27 with the specification of 200 mm multiplied by 1550mm multiplied by 6000mm/8500mm/11000 (thickness multiplied by width multiplied by length) is loaded in a heating furnace 1 in a single row through a steel loading machine, and is heated to a rolling target temperature of 1100 ℃ and ~ 1280 ℃;

secondly, the slab 27 is adjusted and centered by the slab pusher 4 at the inlet of the slab horizontal rolling mill 6, and then is rolled for 2 ~ 4 times on the slab horizontal rolling mill 6 in a reciprocating way, in the rolling process, the slab 27 is subjected to width direction reduction by the slab vertical rolling mill 7, and the head and the tail of the slab 27 are subjected to width taper reduction control until the slab 27 is rolled into an intermediate slab 28 with the thickness of 23 ~ 32mm × 1550mm (thickness × width) by the slab horizontal rolling mill 6.

in the rolling process of each pass of the intermediate billet, the laminar flow and descaling device 5 of the heavy plate rolling mill can be started according to the process requirements to cool and descale the intermediate billet 28 for the second time, so that the intermediate billet 28 meets the requirements of the subsequent treatment process temperature and the temperature of a coil finish rolling process at 900 ℃ and ~ 1150 ℃.

Conveying the intermediate blank 28 to the flying shears 10 through a conveying roller way to cut off the head and the tail, then conveying the intermediate blank to a first furnace coil horizontal rolling mill 15 and a second furnace coil horizontal rolling mill 18, rolling the intermediate blank into strip steel 30 with the thickness of below 25mm, and conveying the strip steel 30 into a second coiling furnace 22 for heat preservation and coiling; in each subsequent reversible pass rolling, the intermediate billet 28 is rolled into a strip steel 30 with the thickness of less than 25mm, and the two ends of the strip steel 30 are respectively rolled on winding drums in a first coiling furnace 11 and a second coiling furnace 22 for heat preservation; the intermediate billet 28 is subjected to heat preservation and reciprocating rolling work by the first coiling furnace 11, the second coiling furnace 22 and the first coil horizontal rolling mill 15 and the second coil horizontal rolling mill 18.

In each pass of the coil finish-rolling in a reciprocating way, the coil edger mill 16 carries out fine adjustment control on the width of the intermediate blank 28, when strip steel rolled from the intermediate blank 28 is fed in a threading way in each finish-rolling pass, the first pinch roll scissors 12 and the second pinch roll scissors 21 are in pinch positions, when the strip steel is normally rolled after the speed of each finish-rolling pass is increased or before the speed is reduced, the first pinch roll scissors 12 and the second pinch roll scissors 21 are lifted to be in guide positions to adjust the tension of the strip steel rolled from the intermediate blank 28, the loop rolls 17 are in working positions in each finish-rolling pass to adjust the tension and the metal flow of the strip steel between the first coil horizontal mill 15 and the second coil horizontal mill 18, and the 3 ~ 5 passes of the finish-rolling steps are repeated to longitudinally roll the intermediate blank 28 along the length direction until the strip steel 30 with the thickness of 1.5mm ~ 26mm is obtained.

In each finish rolling pass, a first steckel mill laminar flow and descaling device 13 and/or a second steckel mill laminar flow and descaling device 20 can be started according to the process requirements to cool the strip steel rolled by the intermediate billet 28 or descale multiple passes so that the rolled strip steel 30 meets the rolling process temperature and the target finish rolling temperature, when the strip steel 30 rolled in the last pass is conveyed to a strip steel post-rolling cooling device 23, the cooling and cooling are immediately carried out by adopting a combined cooling mode of ACC accelerated cooling, UFC ultra-fast cooling and LFC laminar flow cooling, and the strip steel post-rolling cooling device 23 starts or closes each controlled cooling section header according to the cooling requirements of different specifications and varieties of the strip steel 30, and simultaneously sprays water for cooling the upper surface and the lower surface of the strip steel 30 so that the strip steel 30 reaches the target coiling temperature of 450 ℃ ~ 700 ℃ to obtain the target microstructure and good comprehensive metal mechanical properties.

The strip steel 30 after cooling and temperature reduction treatment is conveyed to the centering device 24 for adjustment and centering, surface quality detection is carried out, and finally, a finished product of a steel coil with the thickness of 1.5mm ~ 26mm multiplied by 1550mm (thickness multiplied by width) is coiled by a coiling machine 25 under the help of stepping control of a coiling assisting roller 26.

Example two

As shown in FIG. 1, when a first-furnace coil horizontal rolling mill 15 and a second-furnace coil horizontal rolling mill 18 are simultaneously started to operate and roll to produce coils, a plate blank 27 with the specification of 200 mm × 1550mm × 6000mm/8500mm/11000 (thickness × width × length) is loaded in a heating furnace 1 in a single row by a steel loader, heated to a rolling target temperature of 1100 ℃ C ~ 1280 ℃, taken out from the heating furnace 1 by a steel tapping machine, conveyed to a high-pressure water descaling device 3 by a discharge roller way 2, and cleaned of oxides on the surface of the plate blank 27 by high-pressure water, and then the plate blank 27 is centered by a thick plate pusher 4 at an inlet of the thick plate horizontal rolling mill 6 and then rolled back and forth by 2 ~ 4 passes on the thick plate horizontal rolling mill 6, the plate blank 27 is reduced in the width direction by a thick plate vertical roller 7 during rolling, and the head and the tail of the plate blank 27 are subjected to width taper reduction control until the plate blank 27 is rolled into an intermediate blank with the width of 23 ~ 32mm × 1550mm (thickness × 28 mm) by the thick plate horizontal rolling mill 6.

The intermediate billet 28 is conveyed to the flying shear 10 through a conveying roller way to cut off the head and the tail, and then is conveyed to only one furnace coil horizontal rolling mill frame, the first furnace coil horizontal rolling mill 15 or the second furnace coil horizontal rolling mill 18 to be rolled into a strip steel 30 with the thickness of below 25mm, and the strip steel 30 is conveyed into the second coiling furnace 22 to be subjected to heat preservation and coiling rolling; in each subsequent reversible pass rolling, the intermediate billet 28 is rolled into a strip steel 30 with the thickness of less than 25mm, and the two ends of the strip steel 30 are respectively rolled on winding drums in a first coiling furnace 11 and a second coiling furnace 22 for heat preservation; the intermediate billet 28 is subjected to heat preservation and rolling operations in a reciprocating manner by matching the first coiling furnace 11 and the second coiling furnace 22 with the first coil horizontal rolling mill 15 or the second coil horizontal rolling mill 18 of only one stand.

in each pass of the coil reciprocating finish rolling, when the strip steel rolled by the intermediate blank 28 is fed in a threading way in each finish rolling pass, the first pinch roll scissors 12 and the second pinch roll scissors 21 are both at pinch positions, when the strip steel is normally rolled after the speed of each finish rolling pass is increased or before the speed is reduced, the first pinch roll scissors 12 and the second pinch roll scissors 21 are raised at guide positions to adjust and balance the tension of the strip steel rolled by the intermediate blank 28, and only one coil horizontal rolling mill frame is used for repeatedly rolling 3 ~ 5 times in a reciprocating way in the finish rolling step to longitudinally roll the intermediate blank 28 along the length direction of the blank until the thickness of the strip steel 30 is 3mm ~ 26 mm.

The strip steel 30 after cooling and temperature reduction treatment is conveyed to the centering device 24 for adjustment and centering, surface quality detection is carried out, and finally, a finished product of a steel coil with the thickness of 3mm ~ 26mm multiplied by 1550mm (thickness multiplied by width) is coiled by a coiling machine 25 under the help of stepping control of a coiling assisting roller 26.

EXAMPLE III

As shown in FIG. 2, when the first-furnace coil horizontal rolling mill 15 or the second-furnace coil horizontal rolling mill 18 is independently started to operate and roll to produce coils, a plate blank 27 with the specification of 200 mm × 1550mm × 6000mm/8500mm/11000 (thickness × width × length) is loaded in a heating furnace 1 in a single row by a steel loader, heated to a rolling target temperature of 1100 ℃ C ~ 1280 ℃, taken out from the heating furnace 1 by a steel tapping machine, conveyed to a plate blank high-pressure water descaling device 3 by a discharge roller way 2, and cleaned of oxides on the surface of the plate blank 27 by high-pressure water, and then the plate blank 27 is adjusted and centered by a plate pusher 4 at an inlet of the plate horizontal rolling mill 6 and then rolled back and forth by 2 ~ 4 passes on the plate horizontal rolling mill 6, the plate blank 27 is reduced in the width direction by a plate vertical rolling mill 7 during rolling, and the head and the tail of the plate blank 27 are controlled in a tapered width reduction manner until the plate blank 27 is rolled into an intermediate blank with the width of 23 ~ 32mm × 1550mm (thickness × 28 mm).

In each pass of the coil reciprocating finish rolling, when strip steel rolled by the intermediate blank 28 is fed in a threading mode in each finish rolling pass, the first pinch roll scissors 12 and the second pinch roll scissors 21 are located at pinch positions, when the strip steel is normally rolled after the speed of each finish rolling pass is increased or before the speed is reduced, the first pinch roll scissors 12 and the second pinch roll scissors 21 are raised at guide positions to adjust and balance the tension of the strip steel rolled by the intermediate blank 28, and only one coil horizontal rolling mill frame is used for repeatedly rolling 7 ~ 11 passes through the finish rolling step in a reciprocating mode to enable the intermediate blank 28 to be longitudinally rolled along the length direction of the blank until the thickness of the strip steel 30 is 1.5mm ~ 26 mm.

example four

in each pass of the coil reciprocating finish rolling, when strip steel rolled by the intermediate blank 28 is fed in a threading mode in each finish rolling pass, the first pinch roll scissors 12 and the second pinch roll scissors 21 are located at pinch positions, when the strip steel is normally rolled after the speed of each finish rolling pass is increased or before the speed is reduced, the first pinch roll scissors 12 and the second pinch roll scissors 21 are raised at guide positions to adjust and balance the tension of the strip steel rolled by the intermediate blank 28, and only one coil horizontal rolling mill frame is used for repeatedly rolling 7 ~ 11 passes through the finish rolling step in a reciprocating mode to enable the intermediate blank 28 to be longitudinally rolled along the length direction of the blank until the thickness of the strip steel 30 is 3mm ~ 26 mm.

EXAMPLE five

A thick plate 29 shown in FIG. 1 ~ 2 is produced by distributing slabs 27 of 200 mm × 1550mm × 1000mm/2000mm/3000mm (thickness × width × length) in a heating furnace 1 by a steel feeder in two or three rows, heating to a rolling target temperature of 1100 ℃ C ~ 1280 ℃, discharging the slabs 27 in groups and in single row by a steel tapping machine, conveying the slabs 27 to a slab high-pressure water descaling device 3 through a discharge roller bed 2, removing oxides on the surface of the slabs 27 by high-pressure water, performing 90 ° turning operation on the slabs 27 by a slab pusher 4 at the entrance of a thick plate horizontal rolling mill 6, centering the turned slabs 27 so that the width direction of the slabs 27 is in accordance with the rolling direction, conveying the slabs 27 to a thick plate horizontal rolling mill 6 for 3 ~ 7 passes in a reciprocating manner, performing width direction reduction on the slabs 27 by a thick plate vertical rolling mill 7 during rolling, and performing width taper reduction control on the head and tail of the slabs 27 so that the end, the tail and the middle of the rolled slabs 27 are in accordance with each other, and keeping the width of the slab 356 mm to be equal to the width of the slab 27 (12 ~ 50 mm).

In the rolling process, a laminar flow nozzle of a heavy plate mill and a descaling nozzle of a descaling device 5 are started to remove secondary scale, or a laminar flow nozzle of the heavy plate mill and the descaling device 5 is started to cool the rolled piece of the intermediate blank 28, so that the temperature of the rolled piece of the finished thick plate 29 meets the requirements of the rolling deformation temperature of the thick plate and the final rolling temperature of 700 ℃ ~ 1000 ℃ to 1000 ℃.

subsequently, the thick plate 29 is adjusted and centered by a thick plate pusher 4 at the outlet of a thick plate horizontal rolling mill 6, then is conveyed into a thick plate cooling control device 8 to be cooled to the target straightening temperature of ~ 1000 ℃, then enters a straightening device 9 to be thermally straightened, and after being cut in fixed length, the thick plate 29 is moved into a cooling bed by a steel moving turning plate rack, wherein the thick plate cooling control device 8 has the ACC rapid cooling function, can open or close the headers of each cooling control section of a thick plate rolling mill laminar flow and descaling device 5 according to the cooling requirements of different specifications and varieties, and sprays water to the upper surface and the lower surface of a steel plate simultaneously for uniform cooling so that the thick plate 29 reaches the required process temperature range to obtain the target microstructure and good comprehensive metal mechanical properties.

Claims

1. a method for rolling a plate by a steckel mill comprises the steps of A, heating, B, removing oxides of a plate blank, C, rolling an intermediate blank or rolling a thick plate, D, finish rolling of a furnace coil, E, cooling of a strip steel, and F, coiling of the strip steel; the method is characterized in that:

A. heating, namely feeding the plate blank (27) into a heating furnace (1) to heat to the temperature range of 1100 ℃ ~ 1280 ℃, discharging the heated plate blank (27) onto a discharging roller way (2), and turning to the step B, wherein the plate blank (27) comprises a short blank and a long blank, when the plate blank (27) is the short blank and is heated, the material is distributed in two rows or three rows in the heating furnace (1), and the single rows are respectively discharged;

B. Removing the oxide of the plate blank, namely adjusting and centering the plate blank (27) conveyed and operated by the discharging roller way (2), then conveying the plate blank into a plate blank high-pressure water descaling device (3), spraying high-pressure water to remove the oxide on the upper surface and the lower surface of the plate blank (27) by the plate blank high-pressure water descaling device (3), and conveying the plate blank (27) with the oxide removed to a thick plate horizontal rolling mill (6) to roll a thick plate or an intermediate blank; turning to the step C;

C. Rolling an intermediate blank or rolling a thick plate,

c1, rolling the thick plate, wherein the rolling comprises the following steps:

C101, rolling the thick plate, namely firstly selecting a short slab as a slab (27) for heating in the step A, secondly carrying out oxide removal treatment on the heated slab (27) in the step B, then carrying out 90-degree turning and centering adjustment on the slab (27) by a thick plate pusher (4) on the slab (27) treated in the step B so that the width direction of the slab (27) is consistent with the rolling direction, then conveying the slab into a thick plate horizontal rolling mill (6) for carrying out reciprocating rolling for 3 ~ passes so that the slab (27) is transversely rolled into a thick plate (29) with the target thickness of 12 ~ mm along the width direction of the slab, and in the rolling process, finishing and controlling the width of the slab (27) by a thick plate vertical roller mill (7) to ensure that the rolling widths of the head part and the tail part of the thick plate are consistent with the rolling width of the middle part of the thick plate, in the rolling process of the thick plate, starting a laminar flow and descaling nozzle of a descaling device (5) of the thick plate rolling mill to remove secondary oxidation, or starting a laminar flow and a descaling nozzle of the thick plate rolling mill to carry out cooling treatment on the intermediate slab (28) so that the rolling temperature of the hot mechanical rolling process of the thick plate (28) meets the rolling process requirements of 1000 ℃ of rolling mill (700) rolling the rolling temperature of the rolling process of the hot rolling mill (;

c102, cooling the thick plate, namely conveying the thick plate (29) with the thickness of 12 ~ 50mm obtained by the treatment in the step C101 to a thick plate cooling control device (8) for cooling, uniformly spraying water to the upper surface and the lower surface of the thick plate (29) by the thick plate cooling control device (8) for cooling, wherein the thick plate cooling control device (8) meets the cooling process requirement of the TMCP thermomechanical rolling of the thick plate, so that the thick plate (29) reaches the target straightening temperature of ~ 1000 ℃ of 450 ℃, and turning to the step C103 after the cooling of the thick plate (29) is finished;

C103, outputting the thick plate, conveying the thick plate (29) obtained by the treatment in the step C102 to a correcting device (9) for correcting and straightening, cutting the length of the thick plate into a thick plate (29) semi-finished product, and turning to the step C104;

c104, thick plate finishing, namely, conveying the thick plate (29) semi-finished product obtained by the treatment in the step C103 from a conveying roller way to a cooling bed through a steel moving turning plate rack, then conveying the thick plate (29) semi-finished product to a roller way from an outlet of the cooling bed, conveying the thick plate to a subsequent thick plate finishing area, and carrying out fixed-length shearing, trimming, cold straightening, inspection and nondestructive testing on the thick plate (29) semi-finished product to obtain a thick plate (29) finished product;

C2, rolling an intermediate billet, firstly selecting a long billet as a slab (27) for heating in the step A, secondly carrying out oxide removal treatment on the heated slab (27) in the step B, conveying the slab (27) treated in the step B to a thick plate push bench (4) for centering adjustment of the slab (27), then conveying the slab (27) subjected to centering adjustment into a thick plate horizontal rolling mill (6) for carrying out reciprocating rolling for 2 ~ passes, rolling the slab (27) into the intermediate billet (28) with the thickness of less than 35mm, and carrying out the step D, trimming and controlling the width of the slab (27) by a thick plate vertical rolling mill (7) in the rolling process of the intermediate billet (28) to ensure that the head and the tail of the rolled intermediate billet (28) are consistent with the rolling width of the middle part, starting a laminar flow of the thick plate rolling mill and a descaling nozzle of the descaling device (5) to remove secondary oxidation laminar flow generated on the intermediate billet (28) in the rolling process of the intermediate billet (28), or starting a laminar flow nozzle of the rolling mill and the descaling device (5) to carry out cooling treatment on the intermediate billet (28) to enable the intermediate billet (28) to meet the requirements of rolling temperature reduction of the rolling process of the intermediate billet (28) rolling process of rolling furnace rolling process of rolling mill (1150) and finish rolling of a high-pressure hot rolling mill (900) rolling process roll hot rolling process;

D. The furnace coil is subjected to finish rolling,

D101, conveying the intermediate blank (28) processed in the step C2 to a flying shear (10), cutting off the head and the tail of the intermediate blank (28) by the flying shear (10), and conveying the intermediate blank (28) to pass through the lower part of a first coiling furnace (11) with a closed furnace door; turning to step D102;

D102, adjusting and centering the intermediate blank (28) through a first steckel mill push bed (14), and then sequentially biting into a first steckel horizontal rolling mill (15) and a second steckel horizontal rolling mill (18); after the strip steel rolled by the intermediate billet (28) comes out of a second furnace coil horizontal rolling mill (18), the strip steel is adjusted and centered by a second furnace coil rolling mill push bench (19), then is clamped and conveyed by a second pinch roll scissors (21), enters a second coiling furnace (22) through a laid-down furnace door and is aligned with a coil jaw, when the strip head of the strip steel rolled by the intermediate billet (28) is inserted into the coil jaw for a certain length, a coil of the second coiling furnace (22) is started to synchronously rotate and raise the speed with a first furnace coil horizontal rolling mill (15) and the second furnace coil horizontal rolling mill (18), so that the coil jaw of the second coiling furnace (22) clamps the end head of the strip steel rolled by the intermediate billet (28), and the coil wraps the strip steel tightly to establish tension; turning to step D103;

D103, the second pinch roll scissors (21) run and rise to a guiding and tension balancing working position, so that the strip steel rolled by the intermediate billet (28) is subjected to heat preservation and rolling in a second coiling furnace (22); turning to step D104;

D104, when the tail of the strip steel rolled by the intermediate blank (28) is close to the inlet of the second coil horizontal rolling mill (18), synchronously reducing the speed of the first coil horizontal rolling mill (15), the second coil horizontal rolling mill (18) and the second coiling furnace (22); turning to step D105;

D105, stopping when the tail of the strip steel rolled by the intermediate blank (28) is rolled to the roll gap position of the second coil horizontal rolling mill (18), finishing the rolling work of the first coil, and turning to the step D106; in the process of one-time furnace coil rolling, a furnace coil vertical roll mill (16) is used for fine adjustment and control of the width of an intermediate billet (28);

D106, controlling a second pinch roll scissors (21) to immediately clamp the strip steel rolled by the intermediate billet (28), and synchronously and reversely operating with a second coil horizontal rolling mill (18) and a second coiling furnace (22), wherein the strip tail of the previous pass is changed into a pass strip head, and the strip head of the previous pass is changed into a pass strip tail; the head of the conveyed strip steel is adjusted and centered by a second steckel mill pusher (19), then is sequentially engaged into a second steckel mill horizontal rolling mill (18) and a first steckel mill horizontal rolling mill (15), when the head of the strip steel is discharged from the first steckel mill horizontal rolling mill (15), the head of the strip steel is adjusted and centered by a first steckel mill pusher (14), then is clamped and conveyed by a first pinch roll scissor (12), enters a first coiling furnace (11) through a laid-down furnace door and is aligned with a coiling block jaw, when the strip steel head is inserted into the coiling block jaw for a certain length, the first coiling furnace (11) and the first steckel mill horizontal rolling mill (15), the second steckel mill horizontal rolling mill (18) and the second coiling furnace (22) are synchronously rotated and lifted, so that the coiling block jaw of the first coiling furnace (11) clamps the tail of the strip steel, and simultaneously the coiling block is tightly wrapped to establish tension; turning to step D107;

d107, the first pinch roll scissors (12) and the second pinch roll scissors (21) rise to a guiding and tension balancing working position, so that the strip steel is subjected to heat preservation and rolling in the first coiling furnace (11) and the second coiling furnace (22); turning to step D108;

D108, when the end part of the strip steel rolled by the intermediate blank (28) is rolled to be close to the first steckel horizontal rolling mill (15), synchronously reducing the speed of the first coiling furnace (11), the first steckel horizontal rolling mill (15), the second steckel horizontal rolling mill (18) and the second coiling furnace (22); when the tail of the strip steel rolled by the intermediate blank (28) is rolled to the position of a roller gap of a first furnace coil horizontal rolling mill (15), stopping the rolling mill to finish the rolling work of the second furnace coil; turning to step D109;

d109, next, starting the next reverse rolling, repeating the rolling sequence of the step D102 ~ D109, and performing reciprocating rolling for multiple passes in such a way until the intermediate blank (28) is rolled into an odd number of final passes of a finished strip steel (30) with the thickness of 1.5 ~ 26mm, wherein the strip steel (30) rolled out at the last pass passes through a second coiling furnace (22) with a closed furnace door and is conveyed to a strip steel rolling post-rolling cooling device (23) to become a semi-finished strip steel (30), and turning to the step E for cooling;

E. Cooling the strip steel, namely conveying the semi-finished product strip steel (30) obtained by the treatment of the step D109 to a strip steel post-rolling cooling device (23), uniformly spraying water to cool the upper surface and the lower surface of the semi-finished product strip steel (30) by the strip steel post-rolling cooling device (23), so that the semi-finished product strip steel (30) meets the deformation temperature requirement of the rolling process, reaches the target coiling temperature of 450 ℃ and ~ 700 ℃ to form the finished product strip steel (30) so as to obtain good metal comprehensive mechanical properties, and the strip steel post-rolling cooling device (23) meets the cooling process requirement of strip steel TMCP (thermo mechanical rolling);

F. and E, coiling the strip steel, namely, the finished product of the strip steel (30) which is cooled to the required coiling temperature range through the treatment of the step E is subjected to surface quality detection, is adjusted and centered by a centering device (24) and then enters a coiling machine (25) to be coiled into a steel coil.

2. The method of rolling a plate by a steckel mill as claimed in claim 1, characterized in that: the descaling mode in the step B is to firstly descale the lower surface of the slab (27), two sides of the slab (27) and then descale the upper surface of the slab (27); the non-symmetrical composite slab (27) with special requirements is subjected to single-side descaling and cooling on the rolling surface of the slab (27) so as to control the direction of the raised buckle head of the slab (27) which is out of the roll gap.

3. the method for rolling the plate by the steckel mill as claimed in claim 1, characterized in that in the rolling process of the step D102 ~ D109, a first steckel mill laminar flow and descaling device (13) or a second steckel mill laminar flow and descaling device (20) is started to remove secondary oxides generated in the finish rolling process of the intermediate blank (28), and the descaling water pressure is 20 ~ 25MPa, or any one of the first steckel mill laminar flow and descaling device (13) and the second steckel mill laminar flow and descaling device (20) is started to cool the strip rolled by the intermediate blank (28), so that the strip rolled by the intermediate blank (28) meets the process deformation temperature requirement of the steckel mill TMCP and the target finish rolling temperature of 700 ℃ ~ 1000 ℃.

4. The method for rolling a plate by a steckel mill as claimed in claim 1, characterized in that the steckel mill (16) performs a width-wise reduction of the intermediate blank (28) during the rolling process in step D102 ~ D105 to control the rolling width of the intermediate blank (28) to ensure the width of the head, the middle and the tail of the finished strip (30) after the steckel rolling, the looper rolls (17) perform a tension control of the strip in the pass of the intermediate blank (28) between the steckel mill (15) and the steckel mill (18) during the rolling process in step D102 ~ D109 to balance the metal second flow between the steckel mill (15) and the steckel mill (18) to improve the rolling, and the reciprocating rolling mill is 3 ~ when the steckel mill (15) and the steckel mill (18) are simultaneously operated, and the reciprocating rolling mill is 3611 when the steckel mill (15) or the steckel mill (18) is independently operated.

5. A line for rolling plates in a steckel mill, which carries out the method according to claim 1, characterized in that: comprises a heating furnace (1), a discharge roller way (2), a slab high-pressure water descaling device (3), a thick plate pusher (4), a thick plate mill laminar flow and descaling device (5), a thick plate horizontal mill (6), a thick plate vertical mill (7), a thick plate controlled cooling device (8), a correcting device (9), a flying shear (10), a first coiling furnace (11) and a first pinch roll shear (12), a first steckel mill laminar flow and descaling device (13), a first steckel mill push bed (14), a first steckel mill horizontal rolling mill (15), a steckel vertical rolling mill (16), a loop roll (17), a second steckel mill horizontal rolling mill (18), a second steckel mill push bed (19), a second steckel mill laminar flow and descaling device (20), a second pinch roll shear (21), a second coiling furnace (22), a strip steel rolling after-cooling device (23), a centering device (24) and a coiling machine (25); a discharge roller way (2) is arranged at a discharge port of the heating furnace (1), a slab high-pressure water descaling device (3) is arranged at one end of the discharge roller way (2), and the slab high-pressure water descaling device (3) is sequentially connected with a thick plate horizontal rolling mill (6), a thick plate vertical rolling mill (7), a thick plate controlled cooling device (8) and a correcting device (9) through a conveying roller way; wherein a thick plate push bed (4), a thick plate mill laminar flow and descaling device (5) are sequentially arranged between the slab high-pressure water descaling device (3) and the thick plate horizontal rolling mill (6), and a thick plate mill laminar flow and descaling device (5) and a thick plate push bed (4) are sequentially arranged between the thick plate vertical rolling mill (7) and the thick plate controlled cooling device (8); the other end of the discharging roller way (2) is provided with a flying shear (10), the flying shear (10) is sequentially connected with a first coiling furnace (11), a first pinch roll shear (12), a first steckel mill laminar flow and descaling device (13), a first steckel mill pusher (14), a first steckel horizontal mill (15) and a steckel vertical roll mill (16) through a conveying roller way, the steckel vertical roll mill (16) is sequentially connected with a loop roll (17), a second steckel horizontal mill (18), a second steckel mill pusher (19), a second steckel laminar flow and descaling device (20), a second pinch roll shear (21) and a second coiling furnace (22) through the conveying roller way, and the second coiling furnace (22) is sequentially connected with a steel rolling post-cooling device (23) and a coiling machine (25); and two ends of each conveying roller way are respectively provided with a centering device (24).

6. the production line of plate steckel mill rolled plates according to claim 5, characterized in that: the thick plate horizontal rolling mill (6), the first steckel horizontal rolling mill (15) and the second steckel horizontal rolling mill (18) are four-roller reversible horizontal rolling mills, wherein the rolling width of the thick plate horizontal rolling mill (6) is not less than 1.6 times of that of the first steckel horizontal rolling mill (15), the thick plate horizontal rolling mill (6) adopts an electric pressing mode and a hydraulic pressing mode and has a roll bending function, and the hydraulic pressing mode has an HAGC hydraulic automatic thickness control function; the thick plate vertical rolling mill (7) has an automatic width control (HAWC) function; the first and second horizontal rolling mills (15, 18) have the same rolling width, and the first and second horizontal rolling mills (15, 18) both adopt electric and hydraulic pressing modes and have roll bending and roll shifting functions, wherein the hydraulic pressing mode has an HAGC hydraulic automatic thickness control function.

7. The production line of plate steckel mill rolled plates according to claim 5, characterized in that: the width of the discharging roller way (2) is not less than the width of a conveying roller way from the discharging roller way (2) to the thick plate horizontal rolling mill (6), and the width of the conveying roller way is not less than the width of a feed inlet of the thick plate horizontal rolling mill (6) and the first steckel horizontal rolling mill (15); the thick plate push bench (4) adopts hydraulic transmission, and the thick plate push bench (4) has 90-degree steering and centering operation functions; the straightening device (9) is a thermal straightening device, and thick plate transverse cutting scissors are arranged at the inlet and/or the outlet of the straightening device (9); the thick plate controlled cooling device (8) and the strip steel rolled cooling device (23) adopt one or more combined cooling modes of ACC accelerated cooling, UEC ultra-fast cooling and LEC laminar cooling.

8. the production line of plate steckel mill rolled plates according to claim 5, characterized in that: the coil vertical rolling mill (16) is positioned between a first coil horizontal rolling mill (15) and a second coil horizontal rolling mill (18) and has an automatic width control (HAWC) function; a loop roller (17) with the functions of conveying and controlling the balance tension is arranged between the furnace coil vertical rolling mill (16) and the second furnace coil horizontal rolling mill (18).

9. the production line of plate steckel mill rolled plates according to claim 5, characterized in that: the flying shear (10) is arranged between the discharging roller way (2) and the first coiling furnace (11); the first pinch roll scissors (12) are arranged at a position close to a strip passing furnace door of the first coiling furnace (11); the second pinch roll scissors (21) are arranged at a strip passing furnace door close to the second coiling furnace (22); the coiling machine (25) is provided with at least one, a winding drum of the coiling machine (25) is a stepless expansion and contraction type winding drum, and the coiling machine (25) is provided with a winding assisting roller (26) which is matched with the winding assisting roller and has an automatic stepping control function.