CN113996665A - Production process for rolling extreme thin-specification checkered plate by thin slab - Google Patents
Production process for rolling extreme thin-specification checkered plate by thin slab Download PDFInfo
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- CN113996665A CN113996665A CN202111278471.5A CN202111278471A CN113996665A CN 113996665 A CN113996665 A CN 113996665A CN 202111278471 A CN202111278471 A CN 202111278471A CN 113996665 A CN113996665 A CN 113996665A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 128
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 238000002791 soaking Methods 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 abstract description 27
- 239000010959 steel Substances 0.000 abstract description 27
- 230000000052 comparative effect Effects 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000005098 hot rolling Methods 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 238000010079 rubber tapping Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 244000046052 Phaseolus vulgaris Species 0.000 description 3
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 244000046095 Psophocarpus tetragonolobus Species 0.000 description 1
- 235000010580 Psophocarpus tetragonolobus Nutrition 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—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
-
- 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
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a production process of a thin slab rolling limit thin-specification checkered plate, which belongs to the field of steel production and comprises slab heating, rough rolling, finish rolling, laminar cooling and coiling, wherein in the slab heating, the slab thickness is 90-105 mm, the slab is placed in the middle of a furnace, and the cantilever quantity at two ends of the slab is controlled to be less than or equal to 700 mm; the furnace time is controlled to be 70-140 min integrally; controlling the temperature of a heating furnace to be 750-900 ℃; the furnace temperature of the second heating is controlled to be 1050-1130 ℃, and the total furnace time of the first heating and the second heating is controlled to be 35-70 min; and controlling the temperature of the triple-feeding soaking furnace section and the soaking furnace section by combining the furnace time. Compared with the prior art, the invention can utilize the thin slab to continuously and stably produce the pattern plates with the ultimate thin specification in batches.
Description
Technical Field
The invention relates to the field of steel rolling, and provides a production process for rolling a checkered plate with a limit specification of 1.5mm by using a thin slab on a common hot-rolled strip steel production line, wherein the checkered plate with the limit specification of 1.5mm can be produced by using a thin slab with the thickness of 90-105 mm on a conventional hot-rolled production line.
Background
The checkered plate has the advantages of attractive appearance, skid resistance, reinforced performance, steel saving and the like. The method is widely applied to the fields of traffic, construction, decoration, surrounding bottom plates of equipment, machinery, shipbuilding and the like. The thickness commonly used in the market is from 1.5 to 12mm, and the width is 1010 and 1500 mm.
Along with the domestic continuous casting and rolling production technology. When the continuous casting and rolling production lines are in casting or are abnormal on site, rough rolling is accompanied with production of thin slabs, and the thin slabs are pushed out through a waste pushing mechanism after being sheared and are delivered to a production line for storage. The thin slab market has limited sales volume, low profit and large inventory pressure. The thickness of the thin slab is generally 45-105 mm, the unit weight is small and is 20-50% of that of a normal slab (210mm), the conventional hot rolling line is used for rolling, the problems that a buckle head is easy to bend in the heating process, the temperature drop is large in the rolling process, waste steel is easy to crush in the rolling process and the like are eliminated, the problems of low hourly output, high coal consumption per ton steel and the like exist, the processing cost is 30-50% higher than that of the common slab, and the application of the technology is greatly limited.
Therefore, the Chinese patent application of 'a method for rolling checkered plates by thin slabs' (application number CN201910939710.3) independently developed by our company can use the specification that the main rolling thickness of thin slabs with the thickness of 75-90 mm is less than or equal to 3.0mm, and the checkered plates with the thickness of 2.5mm can be produced at the thinnest. However, when the technology is adopted to roll the checkered plate with the thickness of 1.5mm, the rolling stability is seriously reduced, and the rolled pattern plate is easy to roll and break, so the added price of the specification is higher, and compared with the added price of the specification with the thickness of 2.3mm, the added price is 120 yuan/ton. Therefore, the company can only adopt a manufacturing method of a pattern plate with an ultimate thin specification (application number CN202011063401.3) for rolling the pattern plate with the thickness of 1.2-1.5mm, and a plate blank with the thickness of 210mm is applied, so that a thin plate blank with the thickness of 75-90 mm cannot be used.
Therefore, the production process for rolling the checkered plates with the limit specification of 1.5mm by using thin slabs with the thickness of 75-90 mm on a common hot-rolled strip steel production line is urgently needed to be developed so as to greatly improve the benefit of producing the checkered plates by using the thin slabs on the continuous casting and continuous rolling production line.
Disclosure of Invention
The technical task of the invention is to provide a manufacturing method for producing a limit thin checkered plate by using a thin slab, aiming at the defects of the prior art, so that the economic benefit of producing the checkered plate by using the thin slab on a common hot-rolled strip steel production line is improved, and the limit thin checkered plate with high yield, stable batch production, good plate shape and good surface quality is obtained.
The technical scheme for solving the technical problem is as follows: the production process of the sheet billet rolling limit thin specification checkered plate comprises the steps of heating a sheet billet, rough rolling, finish rolling, laminar cooling and coiling, and is characterized in that: in the slab heating, the slab thickness is 90-105 mm, the slab is placed in the middle for furnace charging, and the cantilever quantity at two ends of the slab is controlled to be less than or equal to 700 mm; the furnace time is controlled to be 70-140 min integrally; controlling the temperature of a heating furnace to be 750-900 ℃; the furnace temperature of the second heating is controlled to be 1050-1130 ℃, and the total furnace time of the first heating and the second heating is controlled to be 35-70 min; controlling the temperature of the triple-feeding soaking furnace section and the soaking furnace section in combination with the furnace time; if T is estimated to be less than or equal to 35 min and less than 50min in the three-feeding soaking furnace section, controlling the furnace temperature of the three-feeding soaking furnace section to be 1250-1300 ℃; if T is estimated to be less than 60min when T is not more than 50 in the three-feeding soaking furnace section, controlling the furnace temperature of the three-feeding soaking furnace section to be 1240-1280 ℃; if T is estimated to be less than or equal to 70min when T is not less than 60 in the three-feeding soaking furnace section, the furnace temperature of the three-feeding soaking furnace section is controlled to be 1220-1270 ℃.
Furthermore, in rough rolling, the descaling mode is set as 1 group at the back of the furnace, the front and back descaling of the rough rolling machine is not used, and the temperature of the back descaling of the furnace is controlled to be 1050-1080 ℃.
Furthermore, in the rough rolling, three times of rolling are adopted in a rough rolling area.
Furthermore, in the rough rolling, the temperature drop of a rough rolling area is controlled within 20 ℃.
Furthermore, in the finish rolling, the reduction rate of finish rolling F7 is controlled to be 17-19%.
Furthermore, in the finish rolling, the finish rolling temperature is controlled to be 820-860 ℃.
Furthermore, in the cold layer coiling, the coiling temperature is controlled to be 600-640 ℃.
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 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 plate blank is 90-105 mm, and the plate blank and hot rolling process control is adopted to prevent the defects of deformation and plate shape of head and tail buckling in the rolling process, reduce cutting loss and ensure the product quality;
3. the method realizes the continuous batch stable production of the ultimate thin checkered plates by the thin slabs, the minimum thickness reaches 1.5mm, the yield is more than 98.5 percent, and the benefit of producing the checkered plates by the thin slabs on the common hot-rolled strip steel production line is improved.
Detailed Description
The present invention will be further described with reference to the following embodiments. The parameters and operations not mentioned therein are prior art for the rolling of checkered plates and will not be described again here.
The invention provides a production process for rolling a checkered plate with 1.5mm limit specification by using a thin slab on a common hot rolling strip production line, which can be used for producing the checkered plate with 1.5mm limit specification by using a thin slab with the thickness of 90-105 mm on a conventional hot rolling production line, adopts the design of low-carbon low-manganese low-alloy unique components, and comprises the following chemical components in percentage by mass: c: 0.03-0.09%, Si: 0.02% -0.08%, Mn: 0.08-0.15%, P is less than or equal to 0.03%, S is less than or equal to 0.010%, and the balance is Fe and impurities. Compared with the common carbon checkered plate, the checkered plate with the limit specification of 1.5mm is rolled by adopting the low-carbon, low-silicon and low-manganese components, 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 heating a plate blank → rough rolling → finish rolling → laminar cooling → coiling.
S1, heating the plate blank
The thickness of the plate blank is 90-105 mm, the plate blank is placed in the middle and is charged into the furnace, the length of the plate blank entering the furnace is determined according to the distance between the heating walking beams, and the cantilever quantity at the two ends of the plate blank is controlled to be less than or equal to 700 mm. The heating furnace needs high-temperature steel burning due to the 1.5mm specification, if the cantilever quantity is too large, deformation easily occurs in the heating process, and the head and the tail are buckled, so that the steel cannot be discharged.
In the specific embodiment, two double-heat-storage walking beam type heating furnaces are adopted as heating areas of a common hot-rolled strip steel production line, the length of a furnace body is 39m, the width of the furnace body is 12m, and four furnace sections of one-heating furnace, two-heating furnace, three-heating furnace and soaking furnace are divided. The specification of the adopted slab is 210/230 (960-1520) x 11800mm, and the adopted fuel is mainly blast furnace gas. The heating furnace comprises 6 fixed beams and 4 movable beams, wherein the distance between the second and the fifth fixed beams of the three heating and soaking sections (counted from one side of the heating furnace to the other side) is 5800mm, so 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 heating and the second heating is controlled in the steel-smelting process, and the temperature of the third heating and the temperature of the soaking furnace section are controlled by combining the furnace time. The method specifically comprises the following steps:
(1) in-furnace time control
The furnace time is controlled to be 70-140 min.
(2) Furnace temperature control of first-adding and second-adding furnace sections
The furnace temperature of the first furnace feeding section is controlled to be 750-900 ℃; the furnace temperature of the secondary feeding furnace section is controlled to be 1050-1130 ℃. The total time of the first addition and the second addition in the furnace is controlled to be 35-70 min.
(3) Furnace temperature control of triple heating and soaking furnace section
Controlling the hearth temperature of the triple-feeding soaking furnace section and the soaking furnace section according to the estimated furnace time of the triple-feeding soaking furnace section and the soaking furnace section:
if T is estimated to be less than or equal to 35 min and less than 50min in the three-feeding soaking furnace section, controlling the furnace temperature of the three-feeding soaking furnace section to be 1250-1300 ℃;
if T is estimated to be less than 60min when T is not more than 50 in the three-feeding soaking furnace section, controlling the furnace temperature of the three-feeding soaking furnace section to be 1240-1280 ℃;
if T is estimated to be less than or equal to 70min when T is not less than 60 in the three-feeding soaking furnace section, the furnace temperature of the three-feeding soaking furnace section is controlled to be 1220-1270 ℃.
And in the first heating zone, the second heating zone and the third heating zone, low-temperature steel burning is adopted, high-temperature quick burning is adopted in the third heating zone and the soaking furnace zone, the furnace time is shortened, the furnace time is too long, the bending deformation of the steel billet in the furnace operation process can be gradually increased, and the steel tapping is influenced.
S2 rough rolling
In a specific embodiment, a rough rolling area hardware production line of a common hot rolled strip steel production line comprises 1 seat of a descaling box at the back of a furnace and 1 seat of a reversing rolling mill E1 and R1, the rough rolling mill can roll by adopting a 3/5/7 pass mode, 1 group of descaling collecting pipes are arranged at the back of a front machine of a rough rolling R1 machine, a heat preservation cover is arranged on an extension roller way at the back of the machine, and the thickness interval of a middle blank in a rough rolling area is 32-48 mm.
(1) Descaling
In the technology of the invention, the descaling mode of the rough rolling procedure is 1 group at the back of the furnace, and the front and back descaling of the rough rolling machine is not used. Generally, when a 210mm plate blank is rolled, descaling before or after a rough rolling R1 machine is used to remove iron oxide scales generated in a rough rolling area in the rough rolling process, because the thickness and the length of a 90-105 mm thin plate blank are small, three times of rolling are adopted, the rough rolling reduction and the pure rolling time are short, the iron oxide scales generated in the rough rolling area are relatively less, and the rolling stability of a finish rolling area is improved for further reducing the temperature drop.
And controlling the post-furnace descaling temperature to be 1050-1080 ℃. Because the slab adopts low carbon low silicon material, when adopting high temperature to bore steel, can produce slight discount in the heating furnace and detain the tail, because of heating furnace tapping roller way does not have pergola roll table interval longer (1.2m) simultaneously, the slab goes out the stove back at the tapping roller way operation in-process, because of the vibration from top to bottom of slab afterbody, detains the tail and can further aggravate. The descaling temperature after the furnace is limited to be less than or equal to 1080 ℃, and the tail buckling can be prevented from being further aggravated.
(2) Three-pass rolling
The thickness of the intermediate blank at the outlet of the rough rolling is set to be 32-34 mm.
And the rough rolling area adopts three-pass rolling, the speed of each pass is given by referring to the speeds of three, four and five passes under a five-pass mode, the first-pass rolling speed is 2.3-2.6 m/s, the second-pass rolling speed is 3-3.5 m/s, and the third-pass rolling speed is 4-4.5 m/s.
The temperature drop of the rough rolling area is controlled within 20 ℃.
By increasing the rough rolling speed, the descaling pass before the rough rolling mill is reduced, the temperature drop of a rough rolling area is reduced, and meanwhile, the thickness of a rough rolling intermediate blank is set to be 32-34 mm, the deformation of the rough rolling area is increased, the heat generated by deformation is increased, and the temperature drop of the rough rolling area is controlled within 20 ℃. The effect of reducing the deformation of the finish rolling area and reducing the finish rolling load is also achieved by reducing the thickness of the intermediate billet.
In the existing production line, a hot coil box area comprises a hot coil box body, a flying shear and a finish rolling descaling box, and the hot coil box can be selectively put into service and directly connected. After rough rolling, a heat-insulating cover of the intermediate roller way is put into use to relieve the temperature drop of the intermediate billet, and the hot coil box is not put into use.
The obtained intermediate blank only cuts the head but not the tail. Because the rough rolling reduction rate is smaller than that of a normal plate blank, the tail dovetail of the middle blank is shorter, the yield can be improved by adopting a mode of not cutting the tail, and the economic benefit is further improved.
S4 finish rolling
In a specific embodiment, the finish rolling area of a common hot rolled strip production line comprises 7 finish rolling mills and a large instrument.
In the technology of the invention, the reduction rate of finish rolling F7 is controlled to be 17-19%, and the high requirement of beans is ensured by increasing the reduction rate of F7.
And the finish rolling temperature of the finish rolling procedure is controlled to be 820-860 ℃.
S5, cold-rolled sheet
In the specific embodiment, a coiling area laminar flow cooling header and 2 underground recoiling machines of a common hot rolled strip production line are used.
According to the technology, the coiling temperature is controlled to be 600-640 ℃, the finished product strength is ensured through the finish rolling temperature and the coiling temperature which are reasonably designed, and the transverse folding defect in the finishing process is avoided.
To better compare the formulations of the present application with the prior art, comparative tests were performed.
The chemical components and the technical characteristics of the process are adopted in the embodiments 1-3;
comparative example 1 a 90mm thick thin slab was combined using the protocol of my company "method of manufacturing an extremely thin gauge checkered 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: 0.08-0.18%, Mn: 0.95 to 1.25 percent of the total weight of the alloy, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S and the balance of Fe and impurities. The design and manufacturing method comprises the following steps: heating a plate blank → rough rolling → finish rolling → laminar cooling → coiling; the slab heating adopts a four-section heating mode (preheating section 950-; the rough rolling and final rolling temperature is controlled to be 1080-1130 ℃; the start rolling temperature of finish rolling is integrally controlled to be 1000-1050 ℃, the finish rolling temperature is 850-880 ℃, and the threading speed is controlled to be 600-650 m/min; the design of the pattern roller adopts a hyacinth bean shape, the width of a bean at the groove opening of the pattern roller is 9.0mm, the length of the bean is 31.5mm, the shape from the surface of the pattern roller to the groove bottom is arc-shaped along the length direction, the bottom of the roller groove is connected by a smooth arc with the radius R of 2.5mm, and the diameter from the surface to the groove bottom is more than 3.5 mm; the coiling temperature for the cold coiling of the layer is 580-620 ℃.
The heating part of the plate blank in the comparative example 2 adopts the processing method of a method for rolling checkered plates by thin plate blanks (application number CN201910939710.3), the technical elements of the comparative example 1 are used for the composition of the molten steel, and the process technical characteristics of the invention are adopted in the hot rolling process.
The chemical compositions (in weight percent) of examples 1-3 and comparative examples 1-2 are shown in the following table, with the balance being iron and unavoidable impurities.
| Item | 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 |
According to the requirements of the material component design, smelting by adopting a converter, an LF furnace and an RH furnace to obtain molten steel with required components; and continuously casting the molten steel under the protection of Ar blowing in the whole process to obtain a continuous casting slab with the thickness of 90-105 mm. And heating the casting blank, then sending the casting blank to a hot continuous rolling mill for rolling, controlling the rolling by a rough rolling and finish rolling continuous rolling mill set, and coiling after laminar cooling to produce the checkered plate with the thickness of 1.5 mm.
The process flow routes of the examples 1 to 3 and the comparative examples 1 to 2 are as follows: heating of the slab → rough rolling → finish rolling → laminar cooling → coiling.
The main process control parameters for heating the slabs are shown in the following table.
The operation state of the slabs in the heating furnaces in the examples 1-3 and the comparative example 2 is overall good, slight S-bending exists, and the slab discharging and the operation on a roller way are not influenced.
In comparative example 1, due to the fact that the heating temperature is too high, the furnace time is too long, the slab has the problems that the head and the tail of the slab are seriously collapsed after entering the third heating section, and the steel tapping rod of a steel tapping machine is collided, so that the test is stopped, and the rolling 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 the temperature drop of the intermediate billet is relieved by using an intermediate roller way heat-insulating cover after rough rolling.
The product conditions of each example and comparative example 2 are shown in the following table.
From the data in the table, the checkered plates produced in the embodiments 1 to 3 have the advantages of good thickness hit precision, high pattern height and the like, meet the requirements of users, are stable in rolling surface quality and plate shape, can control the rolling rotting proportion 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 stably produced in batches. Comparative example 1 has the problem that steel cannot be tapped when the slab is bent, resulting in furnace shutdown. The comparative example 2 can roll a checkered plate of 1.5mm, but the rolling rotten proportion is as high as 13.9%, the yield is not as high as 92%, and the purpose of stable batch production cannot be achieved, which may be caused by the correlation of slab stage heating, large rough rolling temperature drop, low rough rolling outlet temperature, high Mn content in the components, large deformation resistance and the like.
Therefore, the technical scheme of the invention can realize the purpose of stably rolling the checkered plates with the 1.5mm limit specification by using the thin slabs 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 end part of the thin slab being burnt and collapsed. The quality of the produced checkered plate with the limit specification of 1.5mm is not different from that of the checkered plate produced by the conventional plate blank production mode. By improving the components of steel, the heating process and the rolling process of a rolling line, the efficiency of each ton of steel can be increased by 120 yuan (compared with the efficiency of each ton of steel for producing checkered plates with the specification of 2.3 mm), and the purposes of potential excavation and efficiency increase are achieved.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. The production process of the sheet billet rolling limit thin specification checkered plate comprises the steps of heating a sheet billet, rough rolling, finish rolling, laminar cooling and coiling, and is characterized in that: in the slab heating, the slab thickness is 90-105 mm, the slab is placed in the middle for furnace charging, and the cantilever quantity at two ends of the slab is controlled to be less than or equal to 700 mm; the furnace time is controlled to be 70-140 min integrally; controlling the temperature of a heating furnace to be 750-900 ℃; the furnace temperature of the second heating is controlled to be 1050-1130 ℃, and the total furnace time of the first heating and the second heating is controlled to be 35-70 min; controlling the temperature of the triple-feeding soaking furnace section and the soaking furnace section in combination with the furnace time; if T is estimated to be less than or equal to 35 min and less than 50min in the three-feeding soaking furnace section, controlling the furnace temperature of the three-feeding soaking furnace section to be 1250-1300 ℃; if T is estimated to be less than 60min when T is not more than 50 in the three-feeding soaking furnace section, controlling the furnace temperature of the three-feeding soaking furnace section to be 1240-1280 ℃; if T is estimated to be less than or equal to 70min when T is not less than 60 in the three-feeding soaking furnace section, the furnace temperature of the three-feeding soaking furnace section is controlled to be 1220-1270 ℃.
2. The process for producing a thin slab rolled extreme thin gauge checkered plate as claimed in claim 1, wherein: in the rough rolling, the descaling mode is 1 group behind the furnace, the front and rear descaling of the rough rolling machine is not used, and the temperature of the rear descaling of the furnace is controlled to be 1050-1080 ℃.
3. The process for producing a thin slab rolled extreme thin gauge checkered plate as claimed in claim 1, wherein: in the rough rolling, three times of rolling are adopted in a rough rolling area.
4. The process for producing a thin slab rolled extreme thin gauge checkered plate as claimed in claim 1, wherein: in the rough rolling, the temperature drop of a rough rolling area is controlled within 20 ℃.
5. The process for producing a thin slab rolled extreme thin gauge checkered plate as claimed in claim 1, wherein: in the finish rolling, the reduction rate of finish rolling F7 is controlled to be 17-19%.
6. The process for producing a thin slab rolled extreme thin gauge checkered plate as claimed in claim 1, wherein: in the finish rolling, the finish rolling temperature is controlled to be 820-860 ℃.
7. The process for producing a thin slab rolled extreme thin gauge checkered plate as claimed in claim 1, wherein: in the layer cooling coiling, the coiling temperature is controlled to be 600-640 ℃.
Priority Applications (2)
| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114798737A (en) * | 2022-04-27 | 2022-07-29 | 日照宝华新材料有限公司 | Plate shape control method for producing ultra-thin checkered plate by thin slab continuous casting and rolling |
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| CN1628918A (en) * | 2003-12-19 | 2005-06-22 | 宝钢集团上海梅山有限公司 | Hot-rolled patterned steel sheet production method |
| CN108971224A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of checkered steel plate and its production method |
| CN112317536A (en) * | 2020-09-30 | 2021-02-05 | 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 |
| CN112916616A (en) * | 2019-09-30 | 2021-06-08 | 日照钢铁控股集团有限公司 | Process for rolling sheet billet checkered plate by common hot-rolled strip steel production line |
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- 2021-10-30 CN CN202310170579.5A patent/CN116251835A/en active Pending
- 2021-10-30 CN CN202111278471.5A patent/CN113996665B/en active Active
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| CN1628918A (en) * | 2003-12-19 | 2005-06-22 | 宝钢集团上海梅山有限公司 | Hot-rolled patterned steel sheet production method |
| CN108971224A (en) * | 2018-09-27 | 2018-12-11 | 武汉钢铁有限公司 | A kind of checkered steel plate and its production method |
| CN112916616A (en) * | 2019-09-30 | 2021-06-08 | 日照钢铁控股集团有限公司 | Process for rolling sheet billet checkered plate by common hot-rolled strip steel production line |
| CN112317536A (en) * | 2020-09-30 | 2021-02-05 | 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114798737A (en) * | 2022-04-27 | 2022-07-29 | 日照宝华新材料有限公司 | Plate shape control method for producing ultra-thin checkered plate by thin slab continuous casting and rolling |
| CN114798737B (en) * | 2022-04-27 | 2024-04-30 | 日照宝华新材料有限公司 | Plate shape control method for producing ultra-thin pattern plate by continuous casting and rolling of thin plate blank |
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| CN116251835A (en) | 2023-06-13 |
| CN113996665B (en) | 2023-04-11 |
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Denomination of invention: A production process for rolling extreme thin specification patterned plates with thin slab Effective date of registration: 20231215 Granted publication date: 20230411 Pledgee: Rizhao Bank Co.,Ltd. Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2023980072204 |