CN113732083B - Ultra-fast cooling method for improving buckling performance of hot rolled steel plate - Google Patents
Ultra-fast cooling method for improving buckling performance of hot rolled steel plate Download PDFInfo
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- CN113732083B CN113732083B CN202111009233.4A CN202111009233A CN113732083B CN 113732083 B CN113732083 B CN 113732083B CN 202111009233 A CN202111009233 A CN 202111009233A CN 113732083 B CN113732083 B CN 113732083B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 238000001816 cooling Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 16
- 240000005926 Hamelia patens Species 0.000 claims abstract description 9
- 206010000496 acne Diseases 0.000 claims abstract description 7
- 230000009194 climbing Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001595 flow curve Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000001960 triggered effect Effects 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
- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The invention discloses an ultra-fast cooling method for improving buckling performance of a hot rolled steel plate, which is characterized by comprising the following steps of: setting head shielding time t after setting head and tail shielding distance and coefficient; the head shielding time t is the time from the start of flow rate lifting to the ultra-fast cooling of the steel plate head and is 0<t<t 1 +t 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein t is 1 For valve response time, t 2 The target value time is reached for the flow rate. The head shading time t=t 0 +Δt; wherein t is 0 For the initial set value, deltat is an adjustment value, deltat and the length L of the blackhead after the steel plate is discharged Black color Or length L of the red head Red colour The relationship is as follows: Δt= -0.1 x (L Black color 100) or Δt=0.1 (L Red colour /100). According to the scheme, the time adjustment parameters are additionally arranged, so that the influence of the corresponding valve and the flow climbing process on the cooling quality of the steel plate in the ultra-fast cooling process is effectively solved, the uniformity of the temperature of the head and the tail of the steel plate and the temperature of the plate body are improved, the buckling quantity of the head and the tail of the steel plate is reduced, and the quality of a product is improved.
Description
Technical Field
The invention belongs to the technical field of metallurgical manufacturing, and particularly relates to an ultra-fast cooling method for improving buckling performance of a hot rolled steel plate.
Background
In recent years, with the development requirement of low-temperature water-cooled steel plates with thin specifications, higher requirements are put forward for cooling technologies in the aspects of cooling speed, cooling uniformity and the like, and the novel generation of multifunctional medium plate post-rolling cooling technology characterized by ultra-fast cooling can meet the requirements of various cooling technologies, so that the technology has become the development trend of the medium plate post-rolling cooling technology at home and abroad.
However, in the existing process, the steel plate subjected to water cooling by the ultra-fast cooling device usually has uneven water cooling of the head and the tail, such as lower buckling of the black head, upwarping of the red head and the like. Under the water cooling condition, continuous production is limited by head and tail shielding and hard injury, the buckling of the head and the tail of the steel plate is serious, even the buckling can reach 27 percent of the buckling, the product quality is seriously affected, and additionally cold correction or rescue procedures are forced to be added, so that the production requirement cannot be well met.
Disclosure of Invention
The invention aims to provide an ultra-fast cooling method for improving buckling performance of a hot rolled steel plate, so as to solve the problems in the prior art.
The invention is realized by the following technical scheme: an ultra-fast cooling method for improving buckling performance of a hot rolled steel plate is characterized by comprising the following steps of: setting head shielding time t after setting head and tail shielding distance and coefficient; the head shielding time t is the time from the start of flow rate lifting to the ultra-fast cooling of the steel plate head and is 0<t<t 1 +t 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein t is 1 For valve response time, t 2 The target value time is reached for the flow rate.
Further: the head shading time t=t 0 +Δt; wherein t is 0 For the initial set value, deltat is an adjustment value, deltat and the length L of the blackhead after the steel plate is discharged Black color Or length L of the red head Red colour The relationship is as follows:
Δt=—0.1*（L black color 100) or Δt=0.1 (L Red colour /100）。
The invention has the advantages that: according to the invention, by additionally arranging the time adjustment parameters, the time difference caused by the processes of corresponding valve opening and reaching the target value of the flow in the ultra-fast cooling process is effectively solved, the influence of the flow climbing process on the cooling quality of the steel plate is reduced, and the temperature uniformity of the head and the tail of the steel plate and the plate body is improved. According to the invention, on the basis of the original head-tail shielding adjustment distance and the water flow coefficient, the time adjustment parameter is added, any time parameter within 0-6 seconds is selected by adjusting the head-tail shielding time in the climbing stage of the water flow curve, the head flow lifting signal is triggered in advance, the purpose that the head of each specification of steel plate needs the flow parameter is achieved, the head-tail buckling amount of the steel plate is reduced, and the stable execution of the process is ensured.
Detailed Description
The invention provides an ultrafast cooling method for improving buckling performance of a hot rolled steel plate, which comprises the steps of setting head-tail shielding distance and coefficient and increasing head shielding time t when the steel plate is cooled in an ultrafast cooling mode; the head shielding time t is the time from the position of the steel plate at the beginning of flow lifting to the time when the head of the steel plate is subjected to ultra-fast cooling, that is to say, when the steel plate is at the position,i.e. enter the flow ramp-up phase. In this scheme, the range of the head shading time t is as follows: 0<t<t 1 +t 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein t is 1 For valve response time, t 2 The flow rate reaches the target value, that is, the time from the set flow rate coefficient to the highest value (usually 1) of the coefficient.
Preferably: the head shading time t=t 0 +Δt; wherein t is 0 Is an initial set value, and 0< t 0 <t 1 +t 2 The method comprises the steps of carrying out a first treatment on the surface of the Delta t is an adjusting value, and is modified and adjusted according to the state of the steel plate after water is discharged, wherein delta t and the length L of the black head of the steel plate after water is discharged Black color Or length L of the red head Red colour The relationship is as follows:
Δt=—0.1*（L black color 100) or Δt=0.1 (L Red colour /100）。
In this scheme, the unit of length is mm and the unit of time is s.
Examples
1) First, the head-to-tail shielding parameters are set.
For example, the parameters of a certain specification of steel plate are as follows:
head distance head flow up-coefficient/down-coefficient = 400 x 0.3/0.3;
tail distance tail flow up-coefficient/down-coefficient = 800 x 0.4/0.4;
head mask time 2. Wherein the valve response time 1, the flow ramp time 6.
In this scheme, the valve response time is a parameter of the valve itself, and can be specifically determined according to different valves. The flow rate rising time is the time from the set flow rate coefficient to the highest value (usually 1) of the coefficient after the valve is opened, and as the example of the head, the time from 30% to 100% of the flow rate is taken as the head, the flow rate curve in the cooling process is approximately in a shape of a few, the time is the time taken from the initial low flow rate to the highest flow rate, and the time is approximately a steep slope rising in the curve, so the flow rate rising time is usually 6.
2) Under the above parameter state, if the steel plate is blackened when water is discharged, the time parameter should be reduced, and each time the adjustment is carried out by 0.2. I.e. the time parameter is adjusted to 1.8/1.6/1.4/1.2/1.0 etc. According to the distance between the black heads, the adjustment amplitude can be increased, the black heads are 200mm, the time parameter is adjusted according to 0.2s, and each time the black heads are increased by 100mm, the time parameter is adjusted to be increased by 0.1s.
3) Under the above parameter state, if the steel plate is flushed, the time parameter should be increased, and each time the steel plate is adjusted by 0.2. I.e. the time parameter is adjusted to 2.2/2.4/2.6/2.8/3.0 etc. According to the distance between the red heads, the adjustment amplitude can be increased, the red heads are 200mm, the time parameter is adjusted according to 0.2, and each time the red heads are increased by 100mm, the time parameter is adjusted to be increased by 0.1.
4) In the adjustment process, the range of the time parameter is required to be always qualified, and if the time parameter adjustment effect is not obvious in the corresponding range, the head-tail shielding distance and the water flow coefficient are required to be adjusted in time.
In summary, the invention aims to solve the buckling problem of the head and the tail of the steel plate, and extracts the corresponding time of the water valve and the time when the water flow reaches the target value in the ultra-fast cooling system. And according to the length of time of the climbing stage of the water flow curve, time adjustment parameters are added in the head-to-tail shielding program, different time parameters are set according to different specifications, and buckling situations of head blackhead buckling and red head upturned are eliminated. In the scheme, the head-tail shielding distance and the coefficient are firstly solidified according to the specification, then the head-tail shielding time parameter is adjusted, the head-tail shielding distance and the coefficient in the optimal sequence of the head-tail shielding time parameter adjustment are adjusted, the head-tail shielding time parameter can be adjusted according to the actual water cooling condition of the head and the tail of the steel plate in the whole process, the adjustment is flexible, the adaptability is good, and the control effect on the buckling of the head and the tail of the steel plate is effectively improved.
Claims (1)
1. An ultra-fast cooling method for improving buckling performance of a hot rolled steel plate is characterized by comprising the following steps of: setting head shielding time t after setting head and tail shielding distance and coefficient; the head shielding time t is the time from the start of flow rate lifting to the ultra-fast cooling of the steel plate head and is 0<t<t 1 +t 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein t is 1 For valve response time, t 2 The time for the flow to reach the target value;
the head shading time t=t 0 +Δt；Wherein t is 0 For the initial set value, deltat is an adjustment value, deltat and the length L of the blackhead after the steel plate is discharged Black color Or length L of the red head Red colour The relationship is as follows:
Δt=—0.1*（L black color 100) or Δt=0.1 (L Red colour /100）。
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| CN202111009233.4A CN113732083B (en) | 2021-08-31 | 2021-08-31 | Ultra-fast cooling method for improving buckling performance of hot rolled steel plate |
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| CN202111009233.4A CN113732083B (en) | 2021-08-31 | 2021-08-31 | Ultra-fast cooling method for improving buckling performance of hot rolled steel plate |
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| CN113732083A CN113732083A (en) | 2021-12-03 |
| CN113732083B true CN113732083B (en) | 2023-12-01 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60166117A (en) * | 1984-02-09 | 1985-08-29 | Kawasaki Steel Corp | Cooling method of high temperature steel sheet |
| JP2005288463A (en) * | 2004-03-31 | 2005-10-20 | Jfe Steel Kk | Cooling device and cooling method for steel strip |
| CN1805803A (en) * | 2003-06-13 | 2006-07-19 | 杰富意钢铁株式会社 | Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate |
| KR100775231B1 (en) * | 2006-09-01 | 2007-11-12 | 주식회사 포스코 | Apparatus and method for controlling warp of rolled heavy plate |
| JP2010234446A (en) * | 2010-06-01 | 2010-10-21 | Nippon Steel Corp | Method of cooling hot-rolled steel plate |
| KR20120059178A (en) * | 2010-11-30 | 2012-06-08 | 주식회사 포스코 | Accelerated cooling apparatus and flow control method of the same |
| KR20130014818A (en) * | 2011-08-01 | 2013-02-12 | 주식회사 포스코 | Material cooling method using edge masking apparatus for cooling machine for hot plate |
| CN110883103A (en) * | 2019-11-29 | 2020-03-17 | 张家港宏昌钢板有限公司 | Method for controlling uniformity of cooling temperature of rolled medium plate for ultra-fast cooling system |
| CN112246881A (en) * | 2020-09-29 | 2021-01-22 | 五矿营口中板有限责任公司 | X70 thin and wide plate shape control method suitable for ultra-fast cooling |
-
2021
- 2021-08-31 CN CN202111009233.4A patent/CN113732083B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60166117A (en) * | 1984-02-09 | 1985-08-29 | Kawasaki Steel Corp | Cooling method of high temperature steel sheet |
| CN1805803A (en) * | 2003-06-13 | 2006-07-19 | 杰富意钢铁株式会社 | Controllable cooling method for thick steel plate, thick steel plate manufactured by the controllable cooling method, and cooling device for the thick steel plate |
| JP2005288463A (en) * | 2004-03-31 | 2005-10-20 | Jfe Steel Kk | Cooling device and cooling method for steel strip |
| KR100775231B1 (en) * | 2006-09-01 | 2007-11-12 | 주식회사 포스코 | Apparatus and method for controlling warp of rolled heavy plate |
| JP2010234446A (en) * | 2010-06-01 | 2010-10-21 | Nippon Steel Corp | Method of cooling hot-rolled steel plate |
| KR20120059178A (en) * | 2010-11-30 | 2012-06-08 | 주식회사 포스코 | Accelerated cooling apparatus and flow control method of the same |
| KR20130014818A (en) * | 2011-08-01 | 2013-02-12 | 주식회사 포스코 | Material cooling method using edge masking apparatus for cooling machine for hot plate |
| CN110883103A (en) * | 2019-11-29 | 2020-03-17 | 张家港宏昌钢板有限公司 | Method for controlling uniformity of cooling temperature of rolled medium plate for ultra-fast cooling system |
| CN112246881A (en) * | 2020-09-29 | 2021-01-22 | 五矿营口中板有限责任公司 | X70 thin and wide plate shape control method suitable for ultra-fast cooling |
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Address after: 115005 metallurgical street, old border district, Yingkou City, Liaoning Province Applicant after: Japan Steel Yingkou Medium Plate Co.,Ltd. Address before: 115005 metallurgical street, old border district, Yingkou City, Liaoning Province Applicant before: MINMETALS YINGKOU MEDIUM PLATE Co.,Ltd. |
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