CN116251835A - Method for producing pattern plate with specification of 1.5mm by using sheet billet in common hot rolling production line - Google Patents
Method for producing pattern plate with specification of 1.5mm by using sheet billet in common hot rolling production line Download PDFInfo
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- CN116251835A CN116251835A CN202310170579.5A CN202310170579A CN116251835A CN 116251835 A CN116251835 A CN 116251835A CN 202310170579 A CN202310170579 A CN 202310170579A CN 116251835 A CN116251835 A CN 116251835A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The invention discloses a method for producing a pattern plate with the specification of 1.5mm by using a thin slab in a common hot rolling production line, which belongs to the field of steel production, adopts a low-carbon low-silicon low-manganese component, and uses a common hot rolling strip steel production line for production, and comprises the procedures of slab heating, rough rolling, finish rolling, laminar cooling and coiling, wherein in the slab heating, the thickness of the slab is selected to be 90-105 mm, and the whole time of a furnace is controlled to be 70-140 min; controlling the temperature of the primary heating furnace to be 750-900 ℃; the secondary heating temperature is controlled at 1050-1130 ℃, and the primary heating and secondary heating total heating time is controlled at 35-70 min; and controlling the temperature of the three-adding soaking furnace section in combination with the furnace time. Compared with the prior art, the invention can continuously and stably produce the pattern plate with the specification of 1.5mm in batches on a common hot rolling production line by utilizing the sheet billet.
Description
Technical Field
The invention discloses a divisional application of a patent (2021112784715) of a production process for rolling a thin slab into a limit thin pattern plate, relates to the field of steel rolling, and provides a production process for rolling a limit pattern plate of 1.5mm by using a thin slab in a common hot rolling strip steel production line, which can be used for producing a limit pattern plate of 1.5mm by using a thin slab of 90-105 mm thickness in a conventional hot rolling production line.
Background
The checkered plate has the advantages of attractive appearance, skid resistance, strengthening performance, steel saving and the like. The method has wide application in the fields of transportation, construction, decoration, equipment surrounding bottom plates, machinery, shipbuilding and the like. The thickness of the common coating is varied from 1.5 to 12mm, and the width is 1010 to 1500mm.
With the domestic continuous casting and rolling production technology. When the continuous casting and rolling production lines are abnormal in casting or site, rough rolling is accompanied with the production of thin slabs, and the thin slabs are pushed out through a waste pushing mechanism after shearing and put into storage. The thin slab market has limited sales volume, low profit and high stock pressure. The thickness of the sheet billet is generally 45-105 mm, the single weight of the sheet billet is 20-50% of that of a normal sheet billet (210 mm), the sheet billet is rolled by a conventional hot rolling line, the problems of low hourly yield, high coal consumption per ton of steel and the like are solved besides the problems of easy buckling bending of the buckling head, easy rolling and rotting of steel scraps due to large temperature drop in the rolling process in the heating process, the processing cost is 30-50% higher than that of the normal sheet billet, and the application of the technology is greatly limited.
Therefore, the independent Chinese patent application (application No. CN 201910939710.3) of the inventor (I) can utilize the thin slab with the thickness of 75-90 mm to have the main rolling thickness of less than or equal to 3.0mm, and the thin slab can be produced to 2.5mm at the present time. However, when the technology is adopted to roll the pattern plate with the diameter of 1.5mm, the rolling stability is seriously reduced, and the rolling rot and rolling waste are extremely easy to occur, so that the specification price is higher, and the specification price is 120 yuan/ton compared with the specification price with the diameter of 2.3 mm. Therefore, the rolling of the checkered plates of 1.2-1.5mm in our company can only be carried out by a method for manufacturing the checkered plates of extreme thin specification (application number CN 202011063401.3), and a slab with a thickness of 210mm cannot be used by a slab with a thickness of 75-90 mm.
Therefore, development of a production process for rolling a 1.5mm limit specification checkered plate by using a thin slab with the thickness of 75-90 mm in a common hot rolled strip steel production line is urgently needed to greatly improve the benefit of producing the checkered plate by using the thin slab in a continuous casting and rolling production line.
Disclosure of Invention
The technical task of the invention is to provide a manufacturing method for producing the pattern plate with the extreme thin specification by using the thin plate blank aiming at the defects of the prior art, thereby improving the economic benefit of producing the pattern plate by using the thin plate blank in a common hot-rolled strip steel production line and obtaining the pattern plate with the extreme thin specification with high yield, stable batch production, good plate shape and good surface quality.
The technical scheme for solving the technical problems is as follows: a method for producing a pattern plate with the specification of 1.5mm by using a sheet billet in a common hot rolling production line is characterized by comprising the following steps: adopts a low-carbon low-silicon low-manganese component, and the chemical components of the low-silicon low-manganese component are C:0.03 to 0.09 percent of Si:0.02% -0.08%, mn:0.08 to 0.15 percent; the production process comprises the steps of slab heating, rough rolling, finish rolling, laminar cooling and coiling by using a common hot rolled strip steel production line, wherein in the slab heating, the thickness of a slab is selected to be 90-105 mm, the slab is centrally charged, and the cantilever quantity at two ends of the slab is controlled to be less than or equal to 700mm; the length of the slab is controlled between 6800 mm and 7200 mm; the whole time of the furnace is controlled to be 70-140 min; controlling the temperature of the primary heating furnace to be 750-900 ℃; the secondary heating temperature is controlled at 1050-1130 ℃, and the primary heating and secondary heating total heating time is controlled at 35-70 min; and controlling the temperature of the three-adding soaking furnace section in combination with the furnace time; if the estimated furnace time of the three-adding soaking furnace section is more than or equal to 35 and less than 50 minutes, controlling the furnace temperature of the three-adding soaking furnace section to 1250-1300 ℃; if the estimated furnace time of the three-adding soaking furnace section is 50-60 min, the furnace temperature of the three-adding soaking furnace section is controlled to be 1240-1280 ℃; if the estimated furnace time T of the three-adding soaking furnace section is more than or equal to 60 and less than or equal to 70min, controlling the furnace temperature of the three-adding soaking furnace section to be 1220-1270 ℃; in the rough rolling, the descaling mode is 1 group after the furnace, and the descaling temperature after the furnace is controlled at 1050-1080 ℃; the front and rear descaling of the roughing mill is not used at all; in the finish rolling, the reduction rate of the finish rolling F7 is controlled to be 17-19%.
Further, in the rough rolling described above, the thickness of the intermediate billet is set to 32 to 34mm.
Further, in the rough rolling described above, three passes of rolling are adopted in the rough rolling region.
Further, in the rough rolling, the temperature drop in the rough rolling area is controlled within 20 ℃.
Further, in the finish rolling, the finishing temperature is controlled to be 820 to 860 ℃.
In the above-mentioned laminate cooling coiling, the coiling temperature is controlled to 600 to 640 ℃.
Compared with the prior art, the invention has the following outstanding beneficial effects:
1. the invention optimizes the chemical component proportion, adopts the unique component design of low carbon, low manganese and low alloy, reduces the deformation resistance in the rolling process, further achieves the purpose of reducing the rolling load and improves the rolling stability;
2. the thickness of the slab is selected to be 90-105 mm, and the plate type defects of deformation, buckling head and buckling tail in the rolling process are prevented by controlling the processes of slab and hot rolling, so that the cutting loss is reduced, and the product quality is ensured;
3. the continuous batch stable production of the thin slab with the extreme thin specification is realized, the thinnest thickness reaches 1.5mm, the yield is more than 98.5%, and the benefit of using the thin slab to produce the patterned slab in a common hot-rolled strip steel production line is improved.
Detailed Description
The invention is further described below in connection with the following detailed description. The parameters and operations not mentioned therein are prior art for pattern plate rolling and are not described here.
The invention provides a production process for rolling a 1.5mm limit specification checkered plate by using a sheet billet in a common hot rolled strip steel production line, which can produce the 1.5mm limit specification checkered plate by using a sheet billet with the thickness of 90-105 mm in a conventional hot rolled production line, adopts a low-carbon low-manganese low-alloy unique component design, and comprises the following chemical components in percentage by mass: c:0.03 to 0.09 percent, P is less than or equal to 0.03 percent, S is less than or equal to 0.010 percent, and the balance is Fe and impurities. Compared with common carbon material checkered plates, the low-carbon low-silicon low-manganese component is adopted to roll the checkered plates with the limit specification of 1.5mm, so that the deformation resistance in the rolling process is reduced, the purpose of reducing the rolling load is further achieved, and the rolling stability is improved.
The production process comprises the steps of slab heating, rough rolling, finish rolling, laminar cooling and coiling.
S1, heating a plate blank
The thickness of the slab is selected to be 90-105 mm, the slab is charged in the middle, the length of the slab entering the furnace is determined according to the distance between the heating walking beams, and the cantilever quantity at two ends of the slab is controlled to be less than or equal to 700mm. The heating furnace needs to be high Wen Shaogang with the specification of 1.5mm, if the cantilever quantity is too large, deformation easily occurs in the heating process, buckling heads and buckling tails occur, and the furnace cannot be discharged.
In the specific embodiment, the heating area of the used common hot rolled strip steel production line adopts two double heat storage walking beam type heating furnaces, the length of the furnace body is 39m, the width is 12m, and the four furnace sections are divided into one heating section, two heating sections, three heating sections and soaking section. The design and the application of the slab are 210/230× (960-1520) ×11800mm, and the application of the fuel is mainly blast furnace gas. Wherein, the heating furnace comprises 6 fixed beams and 4 movable beams, wherein the spacing between the second and the fifth fixed beams (counted from one side of the heating furnace to the other side) of the three heating sections and the soaking section is 5800mm, so that the length of the selected slab is controlled between 6800 mm and 7200mm in the production process.
In the technology, the temperature of the first adding and the second adding is controlled in the steel burning process, and the temperature of the third adding and soaking furnace sections is controlled in combination with the furnace time. The method comprises the following steps:
(1) At furnace time control
And controlling the whole time of the furnace to be 70-140 min.
(2) Furnace temperature control for one-charging and two-charging sections
The furnace temperature of the primary furnace adding section is controlled at 750-900 ℃; the furnace temperature of the secondary furnace section is controlled at 1050-1130 ℃. The total furnace time of the first addition and the second addition is controlled to be 35-70 min.
(3) Furnace temperature control of three-charging soaking furnace section
The hearth temperature of the three-adding soaking furnace section is controlled according to the estimated furnace time of the three-adding soaking furnace section and the soaking furnace section:
if the estimated furnace time of the three-adding soaking furnace section is more than or equal to 35 and less than 50 minutes, controlling the furnace temperature of the three-adding soaking furnace section to 1250-1300 ℃;
if the estimated furnace time of the three-adding soaking furnace section is 50-60 min, the furnace temperature of the three-adding soaking furnace section is controlled to be 1240-1280 ℃;
if the estimated furnace time T of the three-adding soaking furnace section is more than or equal to 60 and less than or equal to 70min, the furnace temperature of the three-adding soaking furnace section is controlled to be 1220-1270 ℃.
The first and second heating sections of the heating area adopt low-temperature steel burning, the third and soaking sections adopt high-temperature quick burning, the in-furnace time is shortened, the in-furnace time is overlong, and the bending deformation of the billet in the running process of the furnace can be gradually increased to influence tapping.
S2, rough rolling
In the specific embodiment, the roughing area hardware production line configuration of the used common hot rolled strip steel production line comprises a furnace rear descaling box 1 seat, an E1 and R1 reversible rolling mill 1 seat, the roughing mill can roll in a 3/5/7 pass mode, 1 group of descaling headers are arranged in front of and behind a roughing R1 machine, a heat preservation cover is arranged on a machine rear extension roller way, and the thickness interval of a roughing area intermediate billet is 32-48 mm.
(1) Descaling process
In the technology of the invention, the descaling mode of the rough rolling process is 1 group behind the furnace, and the descaling mode of the front machine and the rear machine of the rough rolling mill is not used at all. When a slab with the thickness of 210mm is rolled, descaling is carried out before or after a rough rolling R1 machine so as to remove iron scales generated in a rough rolling area in the rough rolling process, and the thickness and the length of a sheet billet with the thickness of 90-105 mm are small, three times of rolling are adopted, the rough rolling reduction and the pure rolling time are short, the iron scales generated in the rough rolling area are relatively less, and in order to further improve the rolling stability in a finish rolling area with less temperature drop, the method adopts a mode of removing scales before and after the rough rolling machine, and the method utilizes fine descaling to remove the iron scales generated in the rough rolling to finish rolling process.
The descaling temperature after the furnace is controlled between 1050 and 1080 ℃. Because the slab adopts low-carbon low-silicon materials, when the high-temperature steel is burned, slight buckling heads and buckling tails can be generated in the heating furnace, meanwhile, because the distance between the flower-frame-free roller tables of the steel-tapping roller tables of the heating furnace is longer (1.2 m), the buckling tails can be further aggravated because the tail parts of the slab vibrate up and down in the running process of the steel-tapping roller tables after the slab is discharged from the furnace. The descaling temperature after the furnace is limited to be less than or equal to 1080 ℃, and the tail buckling can be prevented from further aggravating.
(2) Three pass rolling
The thickness of the rough rolling outlet intermediate billet is set to be 32-34 mm.
The rough rolling area adopts three times of rolling, the given speed of each pass refers to the given speeds of three, four and five passes in the five-pass mode, the rolling speed of the first pass is 2.3-2.6 m/s, the rolling speed of the second pass is 3-3.5 m/s, and the rolling speed of the third pass is 4-4.5 m/s.
The temperature drop of the rough rolling area is controlled within 20 ℃.
By improving the rough rolling speed, the descaling pass before the rough rolling mill is reduced, the temperature drop of a rough rolling area is reduced, meanwhile, the thickness of a rough rolling intermediate billet is set to be 32-34 mm, the deformation quantity of the rough rolling area is increased, the heat generated by deformation is increased, and the temperature of the rough rolling area is controlled to be reduced within 20 ℃. The thickness of the intermediate billet is reduced, so that the deformation of the finish rolling area is reduced, and the finish rolling load is reduced.
The existing production line comprises a hot rolling box body, a flying shear and a finish rolling descaling box, wherein the hot rolling box can be used in two modes of direct connection and selective use. After rough rolling, the intermediate roller way heat preservation cover is put into use to relieve the temperature drop of the intermediate blank, and the hot rolling box is not put into use.
The obtained intermediate blank is only cut at the head and not cut at the tail. Because the rough rolling reduction is smaller than that of a normal slab, the tail dovetail of the intermediate slab is shorter, and the yield can be improved by adopting a mode of not cutting the tail, so that the economic benefit is further improved.
S4, finish rolling
In a specific example, the finish rolling zone of a conventional hot rolled strip line used comprises 7 finishing mills and large gauges.
In the technology of the invention, the finish rolling F7 rolling reduction is controlled to be 17-19%, and the bean high requirement is ensured by increasing the F7 rolling reduction.
The finishing temperature of the finish rolling process is controlled between 820 and 860 ℃.
S5, layer cold rolling
In a specific embodiment, a coiling area laminar flow cooling header and a 2-seat underground coiling machine of a common hot rolled strip production line are used.
In the technology of the invention, the coiling temperature is controlled at 600-640 ℃, and the strength of the finished product is ensured by the finish rolling temperature and the coiling temperature which are reasonably designed, so that the transverse folding defect in the finishing process is avoided.
To better compare the formulations of the present application with the prior art, a comparative test was performed.
Examples 1 to 3 employ the chemical components and technical features of the process of the present invention;
comparative example 1A 90mm thick sheet bar was combined using the scheme of I's method for manufacturing an extremely thin pattern plate (application No. CN 202011063401.3). The checkered plate comprises the following chemical components in percentage by mass: c: less than or equal to 0.06 percent, si:0.08 to 0.18 percent, mn:0.95 to 1.25 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.015 percent, and the balance is Fe and impurities. The design and manufacturing method comprises the following steps: heating a plate blank, rough rolling, finish rolling, laminar cooling and coiling; the slab is heated by adopting a four-section heating mode (a preheating section 950-1100 ℃, a first heating section 1150-1250 ℃, a second heating section 1300-1350 ℃, a soaking section temperature 1290-1330 ℃, and a hot blank is more than or equal to 180min in the furnace time, and a cold blank is more than or equal to 210 min); the final rolling temperature of the rough rolling is controlled to be 1080-1130 ℃; the initial rolling temperature of the finish rolling is integrally controlled to be 1000-1050 ℃, the final rolling temperature is 850-880 ℃, and the threading speed is controlled to be 600-650 m/min; the design of the pattern roller shape adopts a hyacinth bean shape, the bean width of the groove opening of the pattern roller is 9.0mm, the bean length is 31.5mm, the length direction from the surface of the pattern roller to the bottom of the groove is arc-shaped, the bottom of the roller groove is connected by a smooth arc with the radius R of 2.5mm, and the surface of the pattern roller is more than 3.5mm from the surface of the pattern roller to the bottom of the groove; the coiling temperature of the layer cold coiling is 580-620 ℃.
The slab heating portion in comparative example 2 was a treatment method of "a method of rolling a checkered plate by a thin slab" (application number CN 201910939710.3), the technical elements of comparative example 1 were used as the molten steel component, and the technical features of the present invention were adopted in the hot rolling step.
The chemical compositions (in weight%) of examples 1-3 and comparative examples 1-2 are shown in the following table, with the balance being iron and unavoidable impurities.
| Project | C | Si | Mn | P | S |
| Example 1 | 0.033 | 0.048 | 0.08 | 0.015 | 0.007 |
| Example 2 | 0.061 | 0.025 | 0.14 | 0.021 | 0.006 |
| Example 3 | 0.087 | 0.075 | 0.12 | 0.011 | 0.010 |
| Comparative example 1 | 0.060 | 0.015 | 1.20 | 0.012 | 0.010 |
| Comparative example 2 | 0.071 | 0.017 | 1.24 | 0.011 | 0.009 |
Smelting by adopting a converter, an LF furnace and an RH furnace according to the requirements of material component design to obtain molten steel with required components; the molten steel is continuously cast by blowing Ar in the whole process to obtain a continuous casting slab with the thickness of 90-105 mm. And heating the casting blank, conveying the casting blank to a hot continuous rolling mill for rolling, controlling the rolling by a rough rolling mill unit and a finish rolling mill unit, and coiling the casting blank after laminar cooling to obtain the checkered plate with the thickness of 1.5 mm.
Examples 1-3 and comparative examples 1-2 were prepared by the following process routes: slab heating, rough rolling, finish rolling, laminar cooling and coiling.
The main process control parameters for slab heating are shown in the following table.
The slabs of examples 1 to 3 and comparative example 2 were all good in running state in the heating furnace, and had slight S-bend, and did not affect the tapping and running on the roller table.
In comparative example 1, the heating temperature is too high, the furnace time is too long, the slab seriously collapses head and tail after entering the three sections, and the problem of striking the tapping rod of the tapping machine occurs, so that the test is stopped, and the rolling treatment is stopped after the heating furnace is cooled.
The main process control parameters of hot rolling are shown in the following table, the thickness of the intermediate billet is 32mm, and an intermediate roller way heat preservation cover is used for relieving the temperature drop of the intermediate billet after rough rolling.
The product of each example and comparative example 2 is shown in the following table.
From the data in the table, the checkered plates produced in examples 1 to 3 have the advantages of good thickness hit precision, high grain height and the like, meet the requirements of users, have stable rolling surface quality and plate shape, can control the rolling rotting ratio to be below 2.5%, have no scrap steel caused by poor rolling stability, have the yield of more than 98.5%, and can be produced in batches stably. The comparative example 1 has the problem that the slab is burnt and bent and cannot be tapped, and the furnace is stopped. The comparative example 2 can realize the rolling of the checkered plate with the thickness of 1.5mm, but the rolling rotting ratio is as high as 13.9 percent, the yield is lower than 92 percent, and the aim of stable mass production cannot be fulfilled, so that the reasons are probably that the plate blank is heated in a stage, the rough rolling temperature is reduced greatly, the rough rolling outlet temperature is low, meanwhile, the Mn content in the components is high, the deformation resistance is large and the like.
Therefore, the technical scheme of the invention can realize the purpose of stably rolling the pattern plate with the limit specification of 1.5mm by using the thin plate blank with the thickness of 90-105 mm on the basis of utilizing the existing production line, and reduce the unplanned furnace shutdown caused by the head collapse of the end part of the thin plate blank. The quality of the produced pattern plate with the limit specification of 1.5mm is not different from that of the pattern plate produced by the conventional plate blank production mode. The invention improves the steel components, the heating process of the rolling line and the rolling process, and the ton steel can be enhanced by 120 yuan (compared with the ton steel for producing the checkered plate with the specification of 2.3 mm), thereby achieving the aim of the submerged-arc synergy.
It is noted that while the present invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various modifications can be made therein without departing from the spirit and scope thereof.
Claims (6)
1. A method for producing a pattern plate with the specification of 1.5mm by using a sheet billet in a common hot rolling production line is characterized by comprising the following steps: adopts a low-carbon low-silicon low-manganese component, and the chemical components of the low-silicon low-manganese component are C:0.03 to 0.09 percent of Si:0.02% -0.08%, mn:0.08 to 0.15 percent; the production process comprises the steps of slab heating, rough rolling, finish rolling, laminar cooling and coiling by using a common hot rolled strip steel production line, wherein in the slab heating, the thickness of a slab is selected to be 90-105 mm, the slab is centrally charged, and the cantilever quantity at two ends of the slab is controlled to be less than or equal to 700mm; the length of the slab is controlled between 6800 mm and 7200 mm; the whole time of the furnace is controlled to be 70-140 min; controlling the temperature of the primary heating furnace to be 750-900 ℃; the secondary heating temperature is controlled at 1050-1130 ℃, and the primary heating and secondary heating total heating time is controlled at 35-70 min; and controlling the temperature of the three-adding soaking furnace section in combination with the furnace time; if the estimated furnace time of the three-adding soaking furnace section is more than or equal to 35 and less than 50 minutes, controlling the furnace temperature of the three-adding soaking furnace section to 1250-1300 ℃; if the estimated furnace time of the three-adding soaking furnace section is 50-60 min, the furnace temperature of the three-adding soaking furnace section is controlled to be 1240-1280 ℃; if the estimated furnace time T of the three-adding soaking furnace section is more than or equal to 60 and less than or equal to 70min, controlling the furnace temperature of the three-adding soaking furnace section to be 1220-1270 ℃; in the rough rolling, the descaling mode is 1 group after the furnace, and the descaling temperature after the furnace is controlled at 1050-1080 ℃; the front and rear descaling of the roughing mill is not used at all; in the finish rolling, the reduction rate of the finish rolling F7 is controlled to be 17-19%.
2. The method for producing the pattern plate with the specification of 1.5mm by using the thin slab in the common hot rolling production line according to claim 1, wherein the method comprises the following steps of: in the rough rolling, the thickness of the intermediate billet is set to be 32-34 mm.
3. The method for producing the pattern plate with the specification of 1.5mm by using the thin slab in the common hot rolling production line according to claim 2, wherein the method comprises the following steps of: in the rough rolling, the rough rolling area adopts three times of rolling.
4. A method for producing a 1.5mm gauge checkered plate from a plain hot rolled line sheet bar as claimed in claim 3, wherein: in the rough rolling, the temperature drop of the rough rolling area is controlled within 20 ℃.
5. The method for producing the pattern plate with the specification of 1.5mm by using the thin slab in the common hot rolling production line according to claim 1, wherein the method comprises the following steps of: in the finish rolling, the finishing temperature is controlled between 820 and 860 ℃.
6. The method for producing the pattern plate with the specification of 1.5mm by using the thin slab in the common hot rolling production line according to claim 5, wherein the method comprises the following steps of: in the layer cooling coiling, the coiling temperature is controlled at 600-640 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310170579.5A CN116251835A (en) | 2021-10-30 | 2021-10-30 | Method for producing pattern plate with specification of 1.5mm by using sheet billet in common hot rolling production line |
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| CN202310170579.5A CN116251835A (en) | 2021-10-30 | 2021-10-30 | Method for producing pattern plate with specification of 1.5mm by using sheet billet in common hot rolling production line |
| CN202111278471.5A CN113996665B (en) | 2021-10-30 | 2021-10-30 | Production process for rolling extreme thin-specification checkered plate by thin slab |
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| CN1307010C (en) * | 2003-12-19 | 2007-03-28 | 宝钢集团上海梅山有限公司 | Hot-rolled patterned steel sheet production method |
| CN108971224B (en) * | 2018-09-27 | 2020-11-06 | 武汉钢铁有限公司 | Production method of patterned steel plate |
| CN110614273B (en) * | 2019-09-30 | 2021-03-19 | 日照钢铁控股集团有限公司 | Method for rolling checkered plate by thin slab |
| CN112317536B (en) * | 2020-09-30 | 2024-01-30 | 日照钢铁控股集团有限公司 | Manufacturing method of pattern plate with extremely thin specification |
| CN112692056A (en) * | 2020-12-30 | 2021-04-23 | 唐山燕山钢铁有限公司 | Production process of ultrathin hot-rolled checkered plate with thickness of less than 1mm |
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2021
- 2021-10-30 CN CN202111278471.5A patent/CN113996665B/en active Active
- 2021-10-30 CN CN202310170579.5A patent/CN116251835A/en active Pending
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| CN113996665B (en) | 2023-04-11 |
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