CN114433626A - Method for improving threading stability of hot continuous rolling thin-specification strip steel - Google Patents
Method for improving threading stability of hot continuous rolling thin-specification strip steel Download PDFInfo
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- CN114433626A CN114433626A CN202210070843.3A CN202210070843A CN114433626A CN 114433626 A CN114433626 A CN 114433626A CN 202210070843 A CN202210070843 A CN 202210070843A CN 114433626 A CN114433626 A CN 114433626A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 93
- 239000010959 steel Substances 0.000 title claims abstract description 93
- 238000005096 rolling process Methods 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000009826 distribution Methods 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 239000011572 manganese Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 4
- 239000007769 metal material Substances 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001687 destabilization Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention relates to the field of metal material processing, and discloses a method for improving threading stability of hot continuous rolling thin-specification strip steel, aiming at solving the problem of high rejection rate in the threading process of the thin-specification strip steel in the prior art, the following scheme is provided, wherein the first step is that the finish rolling start temperature FT0 is controlled to be 1090-1130 ℃, and the finish rolling finish temperature FT7 is controlled to be 900-920 ℃; setting load distribution coefficients, namely accurately setting the load distribution coefficients of the racks F1-F7; step three, setting the AGC adjusting speed of the automatic thickness adjusting device, and adjusting the speed to: 0.8-1.0 mm/s; step four, setting loop tension between the frames F1-F7, and setting loop tension between the frames F1-F7; and step five, setting the position of the finish rolling side guide plate, and setting the position of the side guide plate on the F1-F7 rack. The invention can effectively improve the threading stability of the thin gauge strip steel and provide powerful guarantee for the continuous and stable operation of the thin gauge strip steel production.
Description
Technical Field
The invention relates to the field of metal material processing, in particular to a method for improving threading stability of hot continuous rolling thin-specification strip steel.
Background
In the production of hot continuous rolling strip steel, the threading stability is the basis of stable production of thin specifications and is an important mark for measuring the production level of a rolling line. The thin-specification strip steel has the characteristics of large temperature drop in the rolling process, easiness in deviation of rolled pieces, high requirement on thickness setting precision and the like, so that rolling waste in the strip steel threading process is easily caused, and frequent rolling waste accidents seriously affect the benefit of a production line.
Disclosure of Invention
The invention provides a method for improving threading stability of hot continuous rolling thin-specification strip steel, which solves the problem of high rejection rate in the threading process of the thin-specification strip steel in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving threading stability of hot continuous rolling thin-specification strip steel comprises the following steps:
step one, controlling the finish rolling start temperature FT0 to be 1090-1130 ℃ and the finish rolling finishing temperature FT7 to be 900-920 ℃;
setting load distribution coefficients, namely accurately setting the load distribution coefficients of the racks F1-F7;
step three, setting the AGC adjusting speed of the automatic thickness adjusting device, and adjusting the speed to: 0.8-1.0 mm/s;
step four, setting loop tension between the frames F1-F7, and setting loop tension between the frames F1-F7;
and step five, setting the position of the finish rolling side guide plate, and setting the position of the side guide plate on the F1-F7 rack.
Preferably, in the second step, the load distribution coefficients of the racks F1 to F7 are respectively: 0.95 percent of F1, 0.98 percent of F2, 0.9 percent of F3, 0.8 percent of F4, 0.75 percent of F5, 0.7 percent of F6 and 0.65 percent of F7.
Preferably, the loop tension between adjacent frames in the fourth step is as follows: the tension of the loop between the F1-F2 frames is 7Mpa, the tension of the loop between the F2-F3 frames is 8Mpa, the tension of the loop between the F3-F4 frames is 12.5Mpa, the tension of the loop between the F4-F5 frames is 14Mpa, the tension of the loop between the F5-F6 frames is 15Mpa, and the tension of the loop between the F6-F7 frames is 16 Mpa.
Preferably, in the fifth step, the waiting position of the front side guide plate of the flying shear is 70mm, and the rolling position is 50 mm; f2 waiting position of the guide plate at the inlet side is 30mm, rolling position is 20mm, and steel throwing position is 25 mm; f3 waiting position of the guide plate at the inlet side is 30mm, rolling position is 20mm, and steel throwing position is 25 mm; f4 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f5 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f6 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f7 entrance side guide plate waiting position is 35mm, rolling position is 20mm, and steel throwing position is 25 mm.
Preferably, the thin gauge strip steel comprises: the thickness h is less than or equal to 2mm, the carbon content is less than or equal to 0.2 percent, and the manganese content is less than or equal to 2 percent.
In the invention:
1. the possibility of phase change of the strip steel in the finish rolling process is reduced by controlling the start rolling temperature of the finish rolling mill and improving the finish rolling temperature of the finish rolling; the rolling load of the rear frame is increased, so that the temperature drop of the strip steel on the rear frame is reduced; the second flow unbalance caused by the thickness setting error is reduced by reducing the adjusting speed of an automatic thickness adjusting device AGC; the method can effectively improve the threading stability of the thin gauge strip steel and provide powerful guarantee for the continuous and stable operation of the production of the thin gauge strip steel.
2. The invention is applied to an An steel 1780mm hot continuous rolling unit, the effect is good, the threading stability of thin strip steel with the thickness less than or equal to 2mm is obviously improved, and the tail-flicking proportion is reduced from 1.21 percent to less than 0.15 percent; the thin gauge yield is increased by more than 30 percent, and the batch stable production of the thin gauge automobile steel with the thickness of 1.5mm and the tensile strength of 700Mpa grade is realized.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
The Angang steel 1780mm hot continuous rolling finishing mill group consists of a 7-frame continuous rolling mill. The strip steel produced by the unit mainly comprises carbon and manganese components with carbon content less than or equal to 0.2 percent and manganese content less than or equal to 2 percent, the strip threading stability is not good when thin-specification strip steel with thickness less than or equal to 2mm is produced, the strip steel is more off-tracking and waste rolling, the strip steel plate shape and the surface quality are seriously influenced, especially, the thin-specification automobile steel with tensile strength more than or equal to 600Mpa is an important brand product of the production line, the quality guarantee of the products has higher requirement on the strip threading stability, and the problem of the strip threading stability of the thin-specification strip steel is solved through the specific implementation of the method for improving the thin-specification strip threading stability of the hot continuous rolling strip steel.
A thin gauge strip steel comprising: the thickness h is less than or equal to 2mm, the carbon content is less than or equal to 0.2 percent, and the manganese content is less than or equal to 2 percent.
A method for improving the thin-specification threading stability of hot continuous rolling strip steel comprises the following steps:
step one, the finishing rolling start temperature FT0 is controlled to be 1090-1130 ℃, and the finishing rolling finishing temperature FT7 is controlled to be 900-920 ℃. When the steel grade with the carbon and manganese components with the carbon content less than or equal to 0.2 percent and the manganese content less than or equal to 2 percent is rolled into a thin specification with the thickness less than or equal to 2mm, the finishing rolling temperature is usually set to 860 ℃ or higher, and ideally, the strip structure at this temperature does not undergo transformation from austenite to ferrite, that is, the strip does not undergo transformation during the finishing rolling, but in the actual rolling process, the influence of fast heat dissipation of the strip steel, local water leakage of the rolling mill and the like is caused, the local temperature drop of the edge part of the strip steel or a water leakage affected area is large, so that the local area of the strip steel starts phase change before finish rolling, the volume and the phase change resistance of the strip steel are changed due to the phase change, the local stress is increased at the phase change position of the strip steel, the strip steel is broken by rolling and the like, therefore, the finish rolling temperature is controlled to be 900-920 ℃, and the possibility of local phase change of the strip steel in the finish rolling process can be reduced by increasing the finish rolling temperature.
Step two, setting a load distribution coefficient, wherein the load distribution coefficient of each rack from F1 to F7 is set as follows: 0.95 percent of F1, 0.98 percent of F2, 0.9 percent of F3, 0.8 percent of F4, 0.75 percent of F5, 0.7 percent of F6 and 0.65 percent of F7. The load distribution of the frames F1-F7 in the process of threading the strip steel is generally set as follows: f1:0.98, F2:1.0, F3:0.95, F4:0.75, F5:0.6, F6:0.55 and F7:0.46, wherein the temperature drop of the strip steel is larger as the strip steel is thinner towards the rear rack during threading, the reduction ratio of the front rack is reduced, the reduction ratio of the rear rack is increased, the thickness of the strip steel of the rear rack can be correspondingly increased, the temperature drop of the strip steel during rolling is reduced, and the rolling stability is improved, so that the load of a finishing mill is adjusted towards the rear rack, and the F1:0.95, F2:0.98, F3:0.9, F4:0.8, F5:0.75, F6:0.7 and F7: 0.65.
Step three, setting the AGC adjusting speed of the automatic thickness adjusting device, and adjusting the speed to: 0.8-1.0 mm/s. The thickness control of the hot continuous rolling strip steel is usually realized by an automatic thickness adjusting device AGC, the AGC command is automatically adjusted by an electric automatic control program in the rolling process, and the electric automatic control realizes the control of the AGC adjusting speed by a proportional controller. When thin gauge strip steel is threaded, the thickness setting is unstable, an automatic thickness adjusting device AGC can be quickly pressed down to ensure the thickness of a finished product of the strip steel, but the higher the AGC adjusting speed is, the more serious the second flow imbalance among the frames is, the steel piling and sleeving among the frames are caused, the AGC adjusting speed is reduced by adjusting a proportional controller, and the AGC adjusting speed is reduced from 1.7mm/s to 0.8-1.0mm/s, so that the problem of serious second flow imbalance among the frames is solved.
Step four, setting the tension of the loop between the F1-F7 frames, wherein the tension of the loop between adjacent frames is as follows: the tension of the loop between the F1-F2 frames is 7Mpa, the tension of the loop between the F2-F3 frames is 8Mpa, the tension of the loop between the F3-F4 frames is 12.5Mpa, the tension of the loop between the F4-F5 frames is 14Mpa, the tension of the loop between the F5-F6 frames is 15Mpa, and the tension of the loop between the F6-F7 frames is 16 Mpa. The unstable rolling of the thin-specification strip steel can cause the strip steel to be seriously deviated, so that compared with the strip steel with a medium-thickness specification, the strip steel with the thin specification needs larger loop tension between racks when being threaded so as to improve the centering performance of the strip steel and improve the threading deviation. Thus, the loop tension between the frames is: 6Mpa between the frames F1-F2, 7Mpa between the frames F2-F3, 8.5Mpa between the frames F3-F4, 10Mpa between the frames F4-F5, 11Mpa between the frames F5-F6, and 12.5Mpa between the frames F6-F7 are respectively increased to 7Mpa, 8Mpa, 12.5Mpa, 14Mpa, 15Mpa and 16 Mpa.
Setting the position of a finish rolling side guide plate, waiting for 70mm of a front side guide plate of the flying shear, and rolling for 50 mm; f2 waiting position of the guide plate at the inlet side is 30mm, rolling position is 20mm, and steel throwing position is 25 mm; f3 waiting position of the guide plate at the inlet side is 30mm, rolling position is 20mm, and steel throwing position is 25 mm; f4 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f5 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f6 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f7 entrance side guide plate waiting position is 35mm, rolling position is 20mm, and steel throwing position is 25 mm. The side guide plates are arranged at the inlet end of the rolling mill, have a forced centering effect on the strip steel, and are provided with three positions, namely a waiting position, a rolling position and a steel throwing position, wherein the waiting position is used for controlling the centering of the head of the strip blank; the rolling position is a control position after the strip steel bites into the rolling mill and is used for centering the tail part in the middle of the strip steel, and after the strip steel bites into the rolling mill, the head blocking risk does not exist, so that the position can be placed at a smaller position so as to realize effective centering on the tail part; the steel throwing position is a control position when the strip steel is thrown, and the position is slightly larger than the rolling position because the tail of the strip steel loses tension instantly and is in a destabilization state when the strip steel is thrown. The forced centering function of the side guide plate in the rolling process of the thin-specification strip steel is very important, the proper position control of the side guide plate can not only perform strip steel centering, but also avoid the steel clamping phenomenon of a rolling mill caused by the reduction of guide precision, so that each position of the side guide plate is narrowed according to the actual rolling condition, the waiting position of the front side guide plate of the flying shear is 70mm, and the rolling position is 50 mm; f2 waiting position of the guide plate at the inlet side is 30mm, rolling position is 20mm, and steel throwing position is 25 mm; f3 waiting position of the guide plate at the inlet side is 30mm, rolling position is 20mm, and steel throwing position is 25 mm; f4 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f5 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f6 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f7 entrance side guide plate waiting position is 35mm, rolling position is 20mm, and steel throwing position is 25 mm.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A method for improving threading stability of hot continuous rolling thin-specification strip steel is characterized by comprising the following steps:
step one, controlling the finish rolling start temperature FT0 to be 1090-1130 ℃ and the finish rolling finishing temperature FT7 to be 900-920 ℃;
setting load distribution coefficients, namely accurately setting the load distribution coefficients of the racks F1-F7;
step three, setting the AGC adjusting speed of the automatic thickness adjusting device, and adjusting the speed to: 0.8-1.0 mm/s;
step four, setting loop tension between the frames F1-F7, and setting loop tension between the frames F1-F7;
and step five, setting the position of the finish rolling side guide plate, and setting the position of the side guide plate on the F1-F7 rack.
2. The method for improving the threading stability of the hot continuous rolling thin gauge strip steel according to claim 1, wherein the load distribution coefficients of the stands F1-F7 in the second step are respectively as follows: 0.95 percent of F1, 0.98 percent of F2, 0.9 percent of F3, 0.8 percent of F4, 0.75 percent of F5, 0.7 percent of F6 and 0.65 percent of F7.
3. The method for improving threading stability of the hot continuous rolling thin gauge strip steel according to claim 1, wherein the loop tension between adjacent stands in the fourth step is as follows: the tension of the loop between the F1-F2 frames is 7Mpa, the tension of the loop between the F2-F3 frames is 8Mpa, the tension of the loop between the F3-F4 frames is 12.5Mpa, the tension of the loop between the F4-F5 frames is 14Mpa, the tension of the loop between the F5-F6 frames is 15Mpa, and the tension of the loop between the F6-F7 frames is 16 Mpa.
4. The method for improving the threading stability of the hot continuous rolling thin gauge strip steel according to claim 1, wherein in the fifth step, the flying shear is used for waiting for 70mm at the front side guide plate and rolling for 50 mm; f2 waiting position of the guide plate at the inlet side is 30mm, rolling position is 20mm, and steel throwing position is 25 mm; f3 waiting position of the guide plate at the inlet side is 30mm, rolling position is 20mm, and steel throwing position is 25 mm; f4 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f5 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f6 waiting position of the guide plate at the inlet side is 35mm, rolling position is 20mm, and steel throwing position is 25 mm; f7 entrance side guide plate waiting position is 35mm, rolling position is 20mm, and steel throwing position is 25 mm.
5. A thin gauge strip suitable for use in a method of improving threading stability of a hot continuous rolled thin gauge strip as claimed in claims 1 to 4 comprising: the thickness h is less than or equal to 2mm, the carbon content is less than or equal to 0.2 percent, and the manganese content is less than or equal to 2 percent.
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| CN202210070843.3A CN114433626B (en) | 2022-01-21 | 2022-01-21 | Method for improving threading stability of hot continuous rolling thin strip steel |
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| JPH11188414A (en) * | 1997-12-25 | 1999-07-13 | Nippon Steel Corp | Finish rolling method for continuously hot rolled steel band |
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| CN106825062A (en) * | 2017-04-25 | 2017-06-13 | 山东钢铁集团日照有限公司 | It is a kind of to prevent hot-continuous-rolling strip steel from batching the method for drawing steel |
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| CN111702007A (en) * | 2020-06-24 | 2020-09-25 | 河北工程大学 | Hot rolling finishing mill group strip steel head deviation control method |
| CN112692058A (en) * | 2021-01-07 | 2021-04-23 | 唐山燕山钢铁有限公司 | Rolling process for controlling thickness stability of non-oriented silicon steel |
-
2022
- 2022-01-21 CN CN202210070843.3A patent/CN114433626B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11188414A (en) * | 1997-12-25 | 1999-07-13 | Nippon Steel Corp | Finish rolling method for continuously hot rolled steel band |
| CN106311762A (en) * | 2016-08-26 | 2017-01-11 | 首钢京唐钢铁联合有限责任公司 | Load distribution method improving rolling stability of hot-rolled thin strip |
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| CN111451272A (en) * | 2020-03-31 | 2020-07-28 | 鞍钢股份有限公司 | Finish rolling control method for thin container steel plate |
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| CN112692058A (en) * | 2021-01-07 | 2021-04-23 | 唐山燕山钢铁有限公司 | Rolling process for controlling thickness stability of non-oriented silicon steel |
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