CN111889512A - Method for producing thin steel plate by single-stand rolling mill - Google Patents
Method for producing thin steel plate by single-stand rolling mill Download PDFInfo
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- CN111889512A CN111889512A CN202010804776.4A CN202010804776A CN111889512A CN 111889512 A CN111889512 A CN 111889512A CN 202010804776 A CN202010804776 A CN 202010804776A CN 111889512 A CN111889512 A CN 111889512A
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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Abstract
The invention discloses a method for producing thin steel plates by a single-stand rolling mill, which comprises the following steps: (1) cogging a continuous casting billet with the thickness of 200-250 mm to the thickness of 100-120 mm and the width of 1300-1700 mm, and cutting the continuous casting billet according to the length of 2400-3000 mm; (2) rolling 20 steel plates with the thickness of 8-16 mm and the width close to each other before the production, and performing transition from thick to thin; (3) the out-of-roundness of the roller of the rolling mill is less than or equal to 0.5 mm; (4) the heating and discharging temperature of the plate blank is 1220-1260 ℃, and the cooling water flow of the roller body is controlled to be 650-750 m in the production process3H; (5) the initial rolling temperature is more than or equal to 1200 ℃, the rolling pass is less than or equal to 11, and the final rolling temperature is as follows: increasing one leveling pass after rolling is finished at the temperature of 750-850 ℃, and setting the roller speed to be 5 m/s; (6) straightening by adopting a 9-roller straightener at the straightening temperature of 400-600 ℃ and the straightening speed of 0.5-1.0 m/s; the thin steel plate prepared by the method has the thickness of 5-6 mm, the width of 3400mm, the unevenness of the steel plate less than or equal to 3mm/m, good plate shape, no defects of middle waves, edge waves, camber and the like, and uniform performance.
Description
Technical Field
The invention belongs to the field of ferrous metal rolling technology, and mainly relates to a method for producing thin steel plates by a single-stand rolling mill.
Background
With the economic development, steel sheets are widely used in various fields such as ships, buildings, pressure vessels, and the like as main steel materials. Thin steel plates are mostly produced by a hot continuous rolling mill and a steckel mill, but when the width of the steel plate reaches more than 2000mm, a wide and thick plate mill is needed to be used for production, and in the production process of the wide and thick plate mill, the problems of plate shapes such as wave shapes, sickle bays and steel folding are frequently caused due to the influences of equipment capacity, blank shapes and the like. Meanwhile, the steel plate is wide and thin, so that the overall temperature of the steel plate is quickly reduced and uneven in the rolling process, and the problems of large temperature difference between the steel plate and the steel plate, uneven performance and the like are caused.
Chinese patent publication No. CN 102688884 discloses a rolling process of a 2800mm double-stand medium and heavy plate mill limit specification steel plate; chinese patent publication No. CN 102962253 discloses a rolling process of a 5mm steel plate; chinese patent publication No. CN101259482 discloses a 6mm steel plate rolling process. All the three patent documents adopt a one-firing process, and the rolling passes are more. It has the following disadvantages: the temperature drop is increased, the shape control and the temperature control of the steel plate are not facilitated, meanwhile, the width of the steel plate is small, the width of the rolled rough plate is less than or equal to 2800mm, and the application field of the product is directly influenced.
The invention discloses a rolling method of a wide and thin steel plate, which adopts a double-stand rolling mill to roll the wide and thin steel plate, adopts one-step rolling, has larger thickness of the selected blank, more rolling passes and increased temperature drop, is not beneficial to plate shape and temperature control, and simultaneously has the defects of large blank size, multiple length rolling, over-wide steel plate width, rapid temperature drop, poor temperature uniformity of the same plate and large temperature difference, thus easily causing the non-uniform performance of the steel plate.
The Chinese patent publication No. CN 1019513745 discloses a method for rolling a wide thin plate by a wide and thick plate rolling mill, the thickness of the existing steel plate is 6mm, the invention adopts a two-fire forming process, uses a PVPC mode, controls the AGC function, and solves the problems of unstable plate shape and performance in the production process of the wide and thin plate. It has the following disadvantages: the delivery progress of the steel plate is seriously influenced by adopting a mode of stacking and cooling the lower pressing plate of the rear line of the sub-board, the steel plate is widened in the cogging stage, and the steel plate is not widened during two-fire rolling, so that the transverse performance of the steel plate is poor easily.
None of the above patents proposes a solution to overcome the defects of shape of thin steel plate such as waves, sickles, and stacked steel plates. Therefore, the development of a rolling process of the thin-specification steel plate has great significance for producing the thin-specification steel plate with stable plate shape and uniform performance on wide and thick plate products.
Disclosure of Invention
The invention aims to provide a method for producing thin steel plates by a single-stand rolling mill aiming at the defects of the prior art. The method adopts a single-stand rolling mill and a two-hot forming process for production, avoids the plate shape defects of wave shape, sickle bay, steel folding and the like generated when a thin plate is rolled by a wide and thick plate rolling mill, and has uniform performance, the thickness of 5-7 mm and the width of 2500-3500 mm.
The invention discloses a method for producing thin steel plates by a single-stand rolling mill, which comprises the following steps:
(1) cogging a continuous casting billet with the thickness of 200-250 mm to the thickness of 100-120 mm and the width of 1300-1700 mm, and cutting the continuous casting billet according to the length of 2400-3000 mm; the dimensional accuracy control requirement is that the allowable width deviation is 0 to +10mm, the allowable length deviation is 0 to +20mm, and the allowable diagonal deviation is less than or equal to 10 mm;
(2) rolling 20 steel plates with the thickness of 8-16 mm and the width close to each other before the production, and performing transition from thick to thin;
(3) the out-of-roundness of the roller of the rolling mill is less than or equal to 0.5 mm;
(4) the heating and discharging temperature of the plate blank is 1220-1260 ℃, and the speed of a conveying roller table is high after discharging and descalingThe temperature is more than or equal to 5m/s, the mixture is sent to a rolling mill, and the flow of cooling water of a roll body is controlled to be 650-750 m in the production process3Closing roller way cooling water and side spraying;
(5) the initial rolling temperature is more than or equal to 1200 ℃, the rolling pass is less than or equal to 11, and the final rolling temperature is as follows: the rolling speed is 2-4.5 m/s in the rolling process at 750-850 ℃, a leveling pass is added after the rolling is finished, the roll gap is the sum of the set plate thickness and 3-6 mm, and the roll speed is set to be 5 m/s;
(6) straightening by using a 9-roller straightening machine, wherein the straightening temperature is 400-600 ℃, the roller gap at the inlet of the straightening machine is the thickness minus 4-8 mm of the steel plate, and the straightening speed is 0.5-1.0 m/s.
The invention adopts a two-fire forming process, can greatly reduce the blank thickness of a thin steel plate produced by rolling a wide and thick plate single frame, controls the size deviation of a slit blank after slitting the blank, improves the control precision of the shape of the steel plate, and reduces the defect risks of camber, deviation and the like in the rolling process. The production process is controlled before rolling, the precision requirement of the roller is put forward, the high-temperature initial rolling of the blank is controlled in the rolling process, the rolling pass and the rolling speed are accurately controlled, and the phenomena of edge wave, steel folding, steel jamming and the like in the steel plate rolling process are effectively prevented. And the flattening pass is increased, so that the plate shape defects of edge waves, middle waves and the like of the steel plate can be effectively reduced. The adopted straightening process can effectively eliminate the plate shape defects of edge waves, middle waves and the like of the steel plate and ensure that the unevenness of the steel plate is less than or equal to 3 mm/m.
Compared with the prior art, the invention effectively overcomes the defects of camber, edge wave, middle wave, deviation, steel folding and the like when the wide and thick plate single-stand rolling mill is used for producing the steel plate with the thickness of 5-7 mm, and avoids the steel clamping accident. The thin-specification steel plate with the width of 2500-3500 mm is successfully realized, the unevenness of the steel plate reaches within 3mm/m, the steel plate is good in shape, uniform in performance and low in cost, can be produced in batches, and meets the market demand of the thin-specification steel plate.
Detailed Description
In order to better explain the technical solution of the present invention, the technical solution of the present invention is further described below with reference to specific examples, which are only exemplary to illustrate the technical solution of the present invention and do not limit the present invention in any way.
The following table 1 is a list of actual conditions of controlling the thickness of a continuous casting billet and the size of a split billet after cogging in each of examples 1 to 4 of the invention;
the following tables 2 and 3 are detailed parameter lists of the rolling process in which the slit billets of the embodiments 1 to 4 of the invention enter the steel rolling process through surface inspection;
table 4 below is a list of the dimensions and leveling pass parameters of the steel plates of the slit billets of examples 1 to 4 of the present invention after rolling in tables 2 and 3;
table 5 below is a list of the straightening parameters and the finished plate flatness of the rolled steel plates of examples 1-4 of the present invention.
The invention discloses a method for producing thin steel plates by a single-stand rolling mill, which comprises the following steps:
(1) cogging a continuous casting billet with the thickness of 200-250 mm to the thickness of 100-120 mm and the width of 1300-1700 mm, and cutting the continuous casting billet according to the length of 2400-3000 mm; the dimensional accuracy control requirement is that the allowable width deviation is 0 to +10mm, the allowable length deviation is 0 to +20mm, and the allowable diagonal deviation is less than or equal to 10 mm;
(2) rolling 20 steel plates with the thickness of 8-16 mm and the width close to each other before the production, and performing transition from thick to thin;
(3) the out-of-roundness of the roller of the rolling mill is less than or equal to 0.5 mm;
(4) the slab heating tapping temperature is 1220-1260 ℃, the speed of a conveying roller way is more than or equal to 5m/s after tapping and descaling, the slab is conveyed to a rolling mill, and the flow of cooling water of a roller body is controlled to be 650-750 m in the production process3Closing roller way cooling water and side spraying;
(5) the initial rolling temperature is more than or equal to 1200 ℃, the rolling pass is less than or equal to 11, and the final rolling temperature is as follows: the rolling speed is 2-4.5 m/s in the rolling process at 750-850 ℃, a leveling pass is added after the rolling is finished, the roll gap is the sum of the set plate thickness and 3-6 mm, and the roll speed is set to be 5 m/s;
(6) straightening by using a 9-roller straightening machine, wherein the straightening temperature is 400-600 ℃, the roller gap at the inlet of the straightening machine is the thickness minus 4-8 mm of the steel plate, and the straightening speed is 0.5-1.0 m/s.
TABLE 1 List of practical situation of control of thickness of continuous casting slab and size of slit slab after cogging
And (3) carrying out surface inspection on the split billets obtained in the table 1 and entering a steel rolling process. The rolling process parameters are controlled as shown in tables 2 and 3.
TABLE 2 Rolling parameters 1
TABLE 3 Rolling parameters 2
| Examples | Initial Rolling temperature (. degree.C.) | Pass of rolling | Rolling speed (m/s) | Finish Rolling temperature (. degree.C.) |
| 1 | 1230 | 10 | 2～4 | 810 |
| 2 | 1220 | 10 | 2～4.5 | 820 |
| 3 | 1214 | 11 | 2～4 | 780 |
| 4 | 1221 | 11 | 2～4.5 | 760 |
The dimensions and leveling pass parameters of the steel sheets rolled in tables 2 and 3 are shown in table 4.
TABLE 4 Steel plate dimensions and leveling pass parameters
The straightening parameters and the unevenness of the rolled steel sheet are shown in Table 5
TABLE 5 straightening parameters
| Examples | Straightening temperature | Straightening entry roll gap | Straightening speed | Unevenness of steel plate |
| 1 | 520 | 2 | 0.9 | ≤3mm/m |
| 2 | 570 | 0 | 0.8 | ≤3mm/m |
| 3 | 450 | 1 | 0.6 | ≤3mm/m |
| 4 | 430 | -2 | 0.6 | ≤3mm/m |
As can be seen from the above table, the finished steel plates of examples 1 to 4 manufactured according to the table 1 to 5 have the thickness of 5 to 6mm, the width of 3400mm, the unevenness of the steel plates of not more than 3mm/m, good plate shape, no defects of middle waves, edge waves, camber and the like, and uniform performance.
Claims (2)
1. A method for producing thin gauge steel plate by a single stand rolling mill comprises the following steps:
(1) cogging a continuous casting billet with the thickness of 200-250 mm to the thickness of 100-120 mm and the width of 1300-1700 mm, and cutting the continuous casting billet according to the length of 2400-3000 mm; the dimensional accuracy control requirement is that the allowable width deviation is 0 to +10mm, the allowable length deviation is 0 to +20mm, and the allowable diagonal deviation is less than or equal to 10 mm;
(2) rolling 20 steel plates with the thickness of 8-16 mm and the width close to each other before the production, and performing transition from thick to thin;
(3) the out-of-roundness of the roller of the rolling mill is less than or equal to 0.5 mm;
(4) the slab heating tapping temperature is 1220-1260 ℃, the speed of a conveying roller way is more than or equal to 5m/s after tapping and descaling, the slab is conveyed to a rolling mill, and the flow of cooling water of a roller body is controlled to be 650-750 m in the production process3Closing roller way cooling water and side spraying;
(5) the initial rolling temperature is more than or equal to 1200 ℃, the rolling pass is less than or equal to 11, and the final rolling temperature is as follows: the rolling speed is 2-4.5 m/s in the rolling process at 750-850 ℃, a leveling pass is added after the rolling is finished, the roll gap is the sum of the set plate thickness and 3-6 mm, and the roll speed is set to be 5 m/s;
(6) straightening by using a 9-roller straightening machine, wherein the straightening temperature is 400-600 ℃, the roller gap at the inlet of the straightening machine is the thickness minus 4-8 mm of the steel plate, and the straightening speed is 0.5-1.0 m/s.
2. The method of producing thin gauge steel sheet in a single stand rolling mill according to claim 1, wherein: the thickness of the thin steel plate is 5-6 mm, the width of the thin steel plate is 3400mm, and the unevenness of the steel plate is less than or equal to 3 mm/m.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112658030A (en) * | 2020-12-03 | 2021-04-16 | 南京钢铁股份有限公司 | Rolling method of wide and thin high-nickel-molybdenum austenitic stainless steel plate |
| CN113210421A (en) * | 2021-05-19 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Production method for controlling transverse plate shape of high-quality carbon structural steel plate based on single-frame wide and thick plate rolling line |
| CN114042778A (en) * | 2021-11-02 | 2022-02-15 | 山东钢铁集团日照有限公司 | Hot straightening process for thin and wide super-high-strength steel plate |
| CN114130834A (en) * | 2021-11-30 | 2022-03-04 | 宝武集团鄂城钢铁有限公司 | Production method for accurately controlling thickness range of thin steel plate by adopting single-stand rolling mill |
| CN115351074A (en) * | 2022-07-28 | 2022-11-18 | 鞍钢股份有限公司 | Plate shape control method for low-cost thin steel plate with yield strength of 355MPa |
| WO2023138121A1 (en) * | 2022-01-19 | 2023-07-27 | 南京钢铁股份有限公司 | Method for producing thin specification steel plate |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112658030A (en) * | 2020-12-03 | 2021-04-16 | 南京钢铁股份有限公司 | Rolling method of wide and thin high-nickel-molybdenum austenitic stainless steel plate |
| CN113210421A (en) * | 2021-05-19 | 2021-08-06 | 宝武集团鄂城钢铁有限公司 | Production method for controlling transverse plate shape of high-quality carbon structural steel plate based on single-frame wide and thick plate rolling line |
| CN113210421B (en) * | 2021-05-19 | 2022-07-12 | 宝武集团鄂城钢铁有限公司 | Production method for controlling transverse plate shape of high-quality carbon structural steel plate |
| CN114042778A (en) * | 2021-11-02 | 2022-02-15 | 山东钢铁集团日照有限公司 | Hot straightening process for thin and wide super-high-strength steel plate |
| CN114130834A (en) * | 2021-11-30 | 2022-03-04 | 宝武集团鄂城钢铁有限公司 | Production method for accurately controlling thickness range of thin steel plate by adopting single-stand rolling mill |
| CN114130834B (en) * | 2021-11-30 | 2023-08-22 | 宝武集团鄂城钢铁有限公司 | Production method for precisely controlling thickness range of thin steel plate by adopting single-frame rolling mill |
| WO2023138121A1 (en) * | 2022-01-19 | 2023-07-27 | 南京钢铁股份有限公司 | Method for producing thin specification steel plate |
| CN115351074A (en) * | 2022-07-28 | 2022-11-18 | 鞍钢股份有限公司 | Plate shape control method for low-cost thin steel plate with yield strength of 355MPa |
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