CN116713321A - Method for improving rolling efficiency of medium plate with Q235B specification of 14mm - Google Patents
Method for improving rolling efficiency of medium plate with Q235B specification of 14mm Download PDFInfo
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- CN116713321A CN116713321A CN202310626240.1A CN202310626240A CN116713321A CN 116713321 A CN116713321 A CN 116713321A CN 202310626240 A CN202310626240 A CN 202310626240A CN 116713321 A CN116713321 A CN 116713321A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 239000000126 substance Substances 0.000 claims abstract description 8
- 230000009467 reduction Effects 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 238000010008 shearing Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 7
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000010079 rubber tapping Methods 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000033764 rhythmic process Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/58—Roll-force control; Roll-gap control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/06—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing of strip material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0071—Levelling the rolled product
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The application discloses a method for improving rolling efficiency of a medium plate with Q235B specification of 14mm, which belongs to the technical field of steel plate rolling, wherein a billet is Q235B, the main chemical components (in percentage by weight) are C=0.14-0.19%, si=0.14-0.25%, mn=0.22-0.42%, S is less than or equal to 0.040%, P is less than or equal to 0.040%, and the heating process of the billet is as follows: the total furnace time is more than or equal to 150min, and the tapping temperature is as follows: 1120-1160 deg.C; the application uses 250 x 160 mm plate blank, adopts the production process route optimization of heating and rolling, and the process has the characteristics of excellent process flow, and can reduce the production cost, increase the yield and stabilize the product quality.
Description
Technical Field
The application belongs to the technical field of steel plate rolling, and particularly relates to a method for improving rolling efficiency of a medium plate with Q235B specification of 14 mm.
Background
In the large environment of low carbon development and high efficiency development advocated in the steel industry, the improvement of rolling efficiency is particularly important, especially for varieties and specifications with lower rolling hour yield, as most of equipment is running during the production of the medium plate, the hour yield is very important in effective time for improving various energy utilization rates, so that the production rate can be improved, the production cost is reduced, the energy consumption level can be saved, and the profit space of the thin-specification steel plate is improved.
In order to ensure rolling stability, the 14mm conventional method adopts 180mm section blanks, because the quantity of the blanks is smaller, the 180mm blanks need to be produced together with an order at ordinary times, when special urgent orders are met, the continuous casting machine is required to replace the sections, the operation rate of the continuous casting machine is reduced, the cost of the blanks is affected, meanwhile, the rolling difficulty of the 180mm rolling 14mm is low, but the rolling cost is relatively high, and the maximum limit of the length of the blanks to the maximum limit of the blanks in a furnace is only 7.3 tons, so that the rolling efficiency is low.
The original compression ratio is 180mm, the compression ratio of rolling 14mm is 12.86, the compression ratio is changed to 250mm, the compression ratio is changed to 17.85, and the thickness of the blank is increased by 70mm.
The current 14mm blank rolling can use 180 x 1600 x 3230 maximum material, the rolling pass is stable, and the blank size is fixed. The subsequent change to 250mm blank requires blank design of the 14mm thick steel plate according to three conditions of rolling control, rolling width and trimming state. The length of the steel plate is increased, the temperature is changed compared with 180mm materials, the straightening pass is limited by the length of the mother plate, and the straightening speed is required to be adjusted according to the shape of the steel plate so as to ensure that the final steel plate meets the national standard.
The application overcomes the problems and designs a 14mm production process method with low cost and high efficiency.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a method for improving the rolling efficiency of a medium plate with the Q235B specification of 14 mm.
The application is realized in such a way that a method for improving the rolling efficiency of a medium plate with the Q235B specification of 14mm is characterized in that:
the method comprises the steps of selecting a steel billet with the size of 250mm multiplied by 1600mm multiplied by (2330-3230) mm to roll a medium plate with the size of 14mm, wherein the main chemical components of the steel billet comprise, by weight, C=0.14-0.19%, si=0.14-0.25%, mn=0.22-0.42%, S is less than or equal to 0.040%, P is less than or equal to 0.040%, and the balance of Fe and unavoidable impurity elements;
heating the steel billet, descaling with high-pressure water, rough rolling, finish rolling, cooling, straightening, shearing, wherein the total compression ratio of the steel plate in the rolling process is more than or equal to 17.85; the specific control method comprises the following steps:
s1, heating by a heating furnace: controlling the temperature of the third heating section to be less than or equal to 980 ℃, the temperature of the second heating section to be 970-1070 ℃, the temperature of the first heating section to be 1150-1240 ℃, the soaking temperature to be 1140-1220 ℃ and the total heating time to be 150-200 minutes;
s2, descaling with high-pressure water: the descaling pressure is controlled at 20-22Mpa, and the descaling of the oxidized iron sheet on the surface of the steel plate is ensured to be clean after the descaling.
S3, rolling: the reduction of the steel plate is increased from 166mm to 236mm from the plate blank, and the total rough finish rolling is realized for 14 times again on the basis of increasing the reduction of 70mm and changing the length of the finished product of the mother plate from 29 meters to 37 meters; wherein, rough rolling is carried out for 7 times, and finish rolling is carried out for 7 times; optimizing the initial rolling temperature to 1120-1160 ℃; the reduction rate of the longitudinal rolling pass after rough rolling is improved from 13% to more than 18%, the longitudinal performance of the steel plate is improved, the reduction rate of the finish rolling is respectively determined to be below 24% through a 3-pass reduction system after finish rolling, and the reduction rate of the last pass is less than 15%; the rough rolling adopts odd pass descaling, the intermediate billet is placed at 80-90mm, the finish rolling is carried out for two passes of descaling, and the final rolling temperature is 890-910 ℃;
s4, cooling: the final cooling temperature is set at 810-840 ℃;
s5, straightening: adopting three times of head, integrally straightening at low speed, and timely adjusting the position of a guide roller at an inlet and outlet of a straightener according to the shape of a steel plate, wherein the specific guide roller gap is controlled to be-0.2 to-5 mm, so that the shape of the head and the tail meets the requirement, and the straightening force is controlled to be 35-45 tons;
s6, shearing according to the set size.
The application has the advantages and technical effects that:
1. the slab with the thickness of 250mm multiplied by 1600mm is adopted, so that the compression ratio reaches 17.86, which is improved by 38.9 percent compared with the original method, the single weight of the blank is improved by 25 percent, and basic conditions are created for ensuring the high strength and the high plasticity of the finished product;
2. the rolling procedure is optimized in a targeted mode, rough rolling and large reduction are performed, the problem that the length and the quality of a rolled steel plate are long and difficult to control is fully considered in the rolling procedure, a 3-pass reduction system is performed after fine adjustment, and the problems that the steel plate is wave-shaped and sickle bending is difficult to control are solved.
3. The 14mm plate is longer, the straightening 3 times influence the production rhythm, the online test is carried out for one time at a low speed, the head is found to be worse through a plurality of times of tests, and finally the head is carried out for three times, the whole is carried out for one time, the guide roller is adjusted in time according to the shape of the steel plate, the shape of the head and the tail is ensured to meet the requirements, the straightening force is set to be corresponding to the steel type of the steel plate straightening thermometer, and the straightening process is changed from the original 180-material straightening process.
The product has the specification of 14mm, the yield strength of Q235B is more than or equal to 235MPa, the tensile strength is more than or equal to 400MPa, and the elongation is more than 23%; the yield is improved by 0.46% compared with the original process, the rolling efficiency is improved by 15-20%, the rolling cost is reduced by 10-15%, and the performance index is excellent and uniform and stable.
Drawings
FIG. 1 is a graph showing the finish rolling reduction ratio according to the present application.
Detailed Description
The present application will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The application aims at comprehensively optimizing the tapping switch of the sheet metal shape in the thickness of 14mm and the rolling process thereof, shortens the rolling time of ton steel by adopting the conventional rolling process, improves the rolling efficiency and the rolling rhythm, shortens the total heating time of the blank in a heating furnace, and further achieves the purpose of reducing the fuel consumption and the electric consumption of ton steel. The specific scheme is as follows:
a method for improving rolling efficiency of a medium plate with Q235B specification of 14mm comprises the steps of selecting a medium plate with the size of 250mm multiplied by 1600mm multiplied by (2330-3230) mm to be rolled by 14mm, wherein the main chemical components of the steel plate are C=0.14-0.19%, si=0.14-0.25%, mn=0.22-0.42%, S is less than or equal to 0.040%, P is less than or equal to 0.040%, and the balance is Fe and unavoidable impurity elements in percentage by weight; the component reduces the upper limit of C element, si element and Mn element on the basis of the existing Q235B, realizes the improvement of performance on the premise of improving the rolling compression ratio, and further realizes the refinement of components and the optimization of cost.
Heating the steel billet, descaling with high-pressure water, rough rolling, finish rolling, cooling, straightening, shearing, wherein the total compression ratio of the steel plate in the rolling process is more than or equal to 17.85; the specific control method comprises the following steps:
s1, heating by a heating furnace: controlling the temperature of the third heating section to be less than or equal to 980 ℃, the temperature of the second heating section to be 970-1070 ℃, the temperature of the first heating section to be 1150-1240 ℃, the soaking temperature to be 1140-1220 ℃ and the total heating time to be 150-200 minutes;
s2, descaling with high-pressure water: the descaling pressure is controlled at 20-22Mpa, and the descaling of the oxidized iron sheet on the surface of the steel plate is ensured to be clean after the descaling.
S3, rolling: the reduction of the steel plate is increased from 166mm to 236mm from the plate blank, and the total rough finish rolling is realized for 14 times again on the basis of increasing the reduction of 70mm and changing the length of the finished product of the mother plate from 29 meters to 37 meters; the intermediate blank is redesigned according to the specifications of the blank and the finished product, the rolling pass is optimized, and the rough rolling pass and the finish rolling pass are matched; the probability of throwing and bending is increased, the pass rolling reduction is changed, and wave bending is easy to occur; the following innovation is emphasized in the rolling process: rough rolling for 7 times and finish rolling for 7 times by optimizing rolling passes; the problems of difficult control of rolling quality and low steel plate qualification rate caused by the length of a mother plate are solved, the straightening temperature is reduced, and the straightening difficulty is increased; in the rolling process, optimizing the initial rolling temperature to 1120-1160 ℃; the reduction rate of the longitudinal 3 passes after rough rolling is improved from 13% to more than 18%, the longitudinal performance of the steel plate is improved, and the rolling regulations fully consider the problem that the length and the quality of the rolled steel plate are difficult to control; 3-pass rolling system after fine adjustment in the finish rolling stage, rolling reduction rates are respectively determined to be below 24%, and the final rolling reduction rate is less than 15%, so that the problem that the wave shape of the steel plate is difficult to control and sickle bending is solved; the rough rolling adopts odd pass descaling, the intermediate billet is placed at 80-90mm, the finish rolling is carried out for two passes of descaling, and the final rolling temperature is 890-910 ℃;
s4, cooling: the final cooling temperature is set at 810-840 ℃;
s5, straightening: adopting three times of head, integrally straightening at low speed, and timely adjusting the position of a guide roller at an inlet and outlet of a straightener according to the shape of a steel plate, wherein the specific guide roller gap is controlled to be-0.2 to-5 mm, so that the shape of the head and the tail meets the requirement, and the straightening force is controlled to be 35-45 tons; solves the problem that the production rhythm is affected when straightening for 3 times of 14 mm;
s6, shearing according to the set size.
Preferred embodiments:
first is the preference and setting of the chemical composition.
According to the use requirements and characteristics of the middle-thickness plate and the condition of the existing production line process equipment, the chemical components are optimally designed as shown in the table 1, and the raw materials are as follows: 250X 1600X 2930mm continuous casting slab.
Table 1Q235B chemical composition unit: (%)
| C | Si | Mn | P | S | Fe |
| 0.14-0.19 | 0.14-0.25 | 0.22-0.42 | ≤0.040 | ≤0.040 | Allowance of |
The method for improving the rolling efficiency of the Q235B 14mm medium plate provided by the embodiment comprises the following chemical components: c=0.16%, si=0.20%, mn=0.25%, s=0.015%, p=0.018%, the remainder being Fe and unavoidable impurities.
The rolling process comprises the following steps: heating the steel billet, descaling with high-pressure water, rough rolling, finish rolling, cooling, straightening, shearing, wherein the total compression ratio of the steel plate in the rolling process is more than or equal to 17.85;
specifically, the blank in the heating process is fed into the furnace at 450 ℃, the discharging temperature is 1145 ℃, and the total time of the furnace is 168min. The dimensions of the steel sheet produced were 14mm×2200mm×12000mm (3 times).
The blank is conveyed through a roller way after being discharged from a furnace, firstly enters a high-pressure water descaling box, the descaling pressure is 21.1mpa, the upper surface and the lower surface are subjected to rough descaling, after the rough descaling is finished, the blank is quickly conveyed to a roughing mill through the roller way to be subjected to steel turning rolling, odd passes are used for descaling, the rough rolling is finished for 6 passes of rolling, the intermediate blank is placed at 80mm, and then enters a finish rolling area through one flattening pass, and the rolled piece is subjected to descaling through finish rolling for 1 st and 3 rd passes. The temperature after 7 passes of finish rolling is 908 ℃. The three-pass rolling reduction after finish rolling is 23.5%, 21.1% and 14.2%. And (3) feeding the rolled piece into a laminar flow cooling system after rolling, wherein the temperature of the cooled rolled piece is 800 ℃, and conveying the cooled rolled piece to an online hot straightening machine area through a roller way for straightening. The straightening adopts three times of straightening of the head, the whole plate body is straightened once, the inlet of a guide roller of a straightener is minus 0.2mm, the outlet of the guide roller is minus 3mm, and the straightening resultant force is 40 tons. And (3) feeding the straightened rolled piece on a No. 1 cooling bed, and finally obtaining a product meeting the order requirement through the procedures of shearing by a rotary shear, sampling, surface inspection, spray printing and the like, and warehousing.
The conventional tensile section elongation of the steel plate is 28%, the tensile strength is 465MPa, the yield strength is 265MPa, and the room temperature impact value is 83kJ/m < 2 >.
In summary, the application uses the slab of 250 x 160 mm and adopts the production process route of heating and rolling, and the process has the characteristics of excellent working procedure, thus reducing the production cost, improving the yield and stabilizing the product quality.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (1)
1. A method for improving rolling efficiency of a medium plate with the Q235B specification of 14mm is characterized by comprising the following steps:
the method comprises the steps of selecting a steel billet with the size of 250mm multiplied by 1600mm multiplied by 2330-3230 mm, rolling a medium plate with the size of 14mm, wherein the main chemical components of the steel billet are C=0.14-0.19%, si=0.14-0.25%, mn=0.22-0.42%, S is less than or equal to 0.040%, P is less than or equal to 0.040%, and the balance of Fe and unavoidable impurity elements in percentage by weight;
heating the steel billet, descaling with high-pressure water, rough rolling, finish rolling, cooling, straightening, shearing, wherein the total compression ratio of the steel plate in the rolling process is more than or equal to 17.85; the specific control method comprises the following steps:
s1, heating by a heating furnace: controlling the temperature of the third heating section to be less than or equal to 980 ℃, the temperature of the second heating section to be 970-1070 ℃, the temperature of the first heating section to be 1150-1240 ℃, the soaking temperature to be 1140-1220 ℃ and the total heating time to be 150-200 minutes;
s2, descaling with high-pressure water: the descaling pressure is controlled at 20-22Mpa, so that the descaling of the oxidized iron sheet on the surface of the steel plate is ensured to be clean after the descaling;
s3, rolling: the reduction of the steel plate is increased from 166mm to 236mm from the plate blank, and the total rough finish rolling is realized for 14 times again on the basis of increasing the reduction of 70mm and changing the length of the finished product of the mother plate from 29 meters to 37 meters; wherein, rough rolling is carried out for 7 times, and finish rolling is carried out for 7 times; optimizing the initial rolling temperature to 1120-1160 ℃; the reduction rate of the longitudinal rolling pass after rough rolling is improved from 13% to more than 18%, the longitudinal performance of the steel plate is improved, the reduction rate of the finish rolling is respectively determined to be below 24% through a 3-pass reduction system after finish rolling, and the reduction rate of the last pass is less than 15%; the rough rolling adopts odd pass descaling, the intermediate billet is placed at 80-90mm, the finish rolling is carried out for two passes of descaling, and the final rolling temperature is 890-910 ℃;
s4, cooling: the final cooling temperature is set at 810-840 ℃;
s5, straightening: adopting three times of head, integrally straightening at low speed, and timely adjusting the position of a guide roller at an inlet and outlet of a straightener according to the shape of a steel plate, wherein the specific guide roller gap is controlled to be-0.2 to-5 mm, so that the shape of the head and the tail meets the requirement, and the straightening force is controlled to be 35-45 tons;
s6, shearing according to the set size.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310626240.1A CN116713321A (en) | 2023-05-30 | 2023-05-30 | Method for improving rolling efficiency of medium plate with Q235B specification of 14mm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310626240.1A CN116713321A (en) | 2023-05-30 | 2023-05-30 | Method for improving rolling efficiency of medium plate with Q235B specification of 14mm |
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| CN116713321A true CN116713321A (en) | 2023-09-08 |
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