CN101406902A - Control method of hot-rolled steel sheet water-cooling plate - Google Patents
Control method of hot-rolled steel sheet water-cooling plate Download PDFInfo
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- CN101406902A CN101406902A CNA2008100570194A CN200810057019A CN101406902A CN 101406902 A CN101406902 A CN 101406902A CN A2008100570194 A CNA2008100570194 A CN A2008100570194A CN 200810057019 A CN200810057019 A CN 200810057019A CN 101406902 A CN101406902 A CN 101406902A
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Abstract
The invention relates to a water cooled shape control method for a hot rolled steel plate. The top bottom water ratio and the head tail shielding parameter design and regulation process for the steel plate are determined by the heat exchange characteristic and the volume deformation feature during accelerated cooling process of the hot rolled steel plate. The quantitative relationship between the surface heat load of the steel plate and the flow rate of headers is established; and an upper and lower header initial water ratio function changing with the flow rate and thickness specifications is established based on the quantitative relationship. A reasonable lower/upper header flow ratio R is determined according to the functional relationship: R=0.0149xh+0.33Ln(F)-0.294. Therefore, the upper and lower surfaces of the steel plate are evenly cooled down by water. The technology is suitable for the after-rolling laminar flow water cooled shape technological parameter optimization of a medium and heavy plate and hot continuous rolling band steel, and can quickly and effectively solve the problem of water-cooled bend of the steel plate.
Description
Technical field
The present invention relates to a kind of control method of hot-rolled steel sheet water-cooling plate, be that the straight cooling manifold water of control steel plate water-cooling plate compares method for designing, and the collector water of determining according to wooden dipper Qu Tezheng than and hide the parameter fast adjustment method end to end, the cut deal, the hot-continuous-rolling strip steel cooling manifold water that are specially adapted under the laminar flow cooling condition compare parameter designing.
Background technology
The water-cooling plate problem of hot rolled steel plate is the controlling of production process difficult point always, especially for Wide and Thick Slab, low when the steel plate final cooling temperature, when intensity of cooling is big, it is straight that the steel plate water-cooling plate is difficult to keep, the bent steel plates of most wooden dippers are to deform on heat is rectified cold bed after finishing, serious serious wooden dipper song have just taken place in the water-cooled process.A lot of Heavy Plate Plant adopt cold strong machine or press to reduce the bent amount of plate shape wooden dipper, but will certainly strengthen production cost and influence productivity ratio.
Steel plate wooden dipper triton is often caused by the upper and lower surface inhomogeneous cooling that steel plate upwarping of head, afterbody occur or detains down usually, seriously can cause whole plate wooden dipper song.Under same flow situation, upper header impact zone cooling capacity far is better than lower collector pipe, and is therefore, even for guaranteeing steel plate upper and lower surface intensity of cooling, guarantee that steel plate is keeping good plate shape glacing flatness in the cooling procedure fast, the lower collector pipe flow just is greater than corresponding upper header flow.Therefore suitable following/upper header flow water ratio just becomes the straight key parameter of decision plate shape.Because it is lower usually to roll back steel plate head and tail temperature, especially thinner for the thickness specification, the rolled plate that multiple length is bigger, bigger with the plate temperature difference, therefore only depend on adjusting collector flow water ratio can not solve water-cooled wooden dipper Qu Wenti fully, but to hide function in conjunction with certain flow end to end, that is to say steel plate end to end the part flow water ratio to regulate separately.Steel plate water ratio is not a constant, and under water cooling equipment parameter certain condition, reasonably water ratio should be the function of thickness specification and collector flow.When the upper header flow was identical, along with steel plate thickness specification increases, required lower collector pipe flow was big more; Same thickness specification, down/the upper header flow-rate ratio increases and increase along with the upper header flow, but thickness to the water ratios affect greater than the collector flow.
Summary of the invention
The present invention seeks to solve water-cooling plate wooden dipper Qu Wenti by process means.Than function, can effectively guarantee the water-cooling plate glacing flatness of 10～130m specification steel plate by appropriate design collector flow water.In actual water-cooled process, if respective specification/flow steel plate generation wooden dipper song arranged, can be according to water-cooling plate wooden dipper Qu Tezheng, calculate water that plate shape optimizes than parameter with hide the coefficient adjustment amount end to end, improve the water-cooled uniformity coefficient, effectively eliminate steel plate water-cooled wooden dipper Qu Xianxiang fast.This technology plate shape control in actual use effect is remarkable, and the water-cooling plate qualification rate reaches more than 98%.
The technical solution adopted for the present invention to solve the technical problems is: the present invention relates to a kind of control method of hot-rolled steel sheet water-cooling plate, solve the plate shape wooden dipper Qu Wenti that steel plate causes because of water-cooled is inhomogeneous by disposing cooling water collector flow-rate ratio and hiding coefficient end to end, by stream thermal coupling numerical simulation technology, lower collector pipe and surface of steel plate heat transfer characteristic on the pipe laminar flow are studied, for certain nozzle number, nozzle diameter, nozzle height, the upper header of roller-way spacing and lower collector pipe, set up the quantitative relationship between surface of steel plate thermal force and the collector flow, and set up in view of the above with flow, the declinable lower collector pipe initial water that goes up of finger gauge compares function, down rational/upper header flow-rate ratio R presses the following formula functional relation and quantitatively determines:
R＝0.0149*h+0.33Ln(F)-0.294(1)
Wherein: h is steel plate thickness (mm), and F is upper header flow (L/m
2.min) cooperate simultaneously and a certain amount ofly hide end to end, cover flow end to end and be,
m_htop
0＝0.8；m_hbot
0＝0.7
m_ttop
0＝0.9；m_tbot
0＝0.8
M_htop
0Be head upper header sheltering coefficient, m_hbot
0Be head lower collector pipe sheltering coefficient, m_ttop
0Afterbody upper header sheltering coefficient, m_tbot
0Be afterbody lower collector pipe sheltering coefficient.
This method also can be optimized and revised on former water ratio and sheltering coefficient basis accordingly according to plate shape situation, the control water-cooling plate, and concrete steps are as follows:
4) at first check steel plate wooden dipper Qu Fangxiang, determine upwarping the wooden dipper song or descending button wooden dipper song of steel plate generation;
5) determine steel plate upper and lower surface inhomogeneous cooling relation, if steel plate takes place is to upwarp the wooden dipper song, then explanation is a upper surface cooling＞lower surface, should add big flood ratio, i.e. R+ Δ R behind the straightening process; If button wooden dipper song under being that steel plate takes place, then explanation is a upper surface cooling＜lower surface, should reduce water ratio, i.e. R-Δ R;
6) the water ratio amount Δ R of Tiao Zhenging is determined by formula (2):
ΔR＝0.0005*ΔD+0.0015*h (2)
When steel plate head/tail wooden dipper song only occurring, do not carry out the flow-rate ratio adjustment, just carry out corresponding sheltering coefficient adjustment according to step 3, adjustment amount is determined by formula (3)
Δm＝0.0002*ΔD+0.0015*h (3)
In the formula: h is steel plate thickness (mm), and F is upper header flow (L/m
2.min), Δ D steel plate wooden dipper Qu Buping amount (mm)
Effect of the present invention is: the Wide and Thick Slab water-cooling plate that has effectively guaranteed 10～130mm thickness specification limit is straight, for the bent steel plate of indivedual wooden dippers that may occur, can determine fast that according to wooden dipper Qu Tezheng bent reason of plate shape wooden dipper and water are than parameter adjustment amount, do not having under the cold strong machine situation, the adopting process means solve steel plate water-cooling plate wooden dipper Qu Wenti effectively.
Description of drawings
Be that the present invention is further described in conjunction with the accompanying drawings and embodiments for example with certain Heavy Plate Plant water cooling equipment below.
Fig. 1 is the water ratio of 22mm thickness specification steel plate with the collector changes in flow rate.
Fig. 2 is a steel plate upper surface intensity of cooling during greater than lower surface, and the water-cooling plate before the structural transformation changes.
Fig. 3 is a upper surface intensity of cooling during greater than lower surface, the water-cooling plate when steel plate generation portion of tissue changes.
Fig. 4 is a button wooden dipper bent plate shape schematic diagram under the steel plate.
Fig. 5 is that steel plate upwarps wooden dipper bent plate shape schematic diagram.
The specific embodiment
Following table is according to the reasonable water ratio range under the different flow condition of definite 22mm, 30mm, 40mm, 50mm, 60mm and 80mm thickness specification steel plate of formula (1).
Just can determine substantially that according to the water ratio of formula (1) design the reasonable water that the Wide and Thick Slab of 10～130mm thickness specification limit is used compares scope.
But site environment complexity in actual production, as above the lower collector pipe spray nozzle clogging can cause that conditions such as actual collector flow and water pressure fluctuations change, and might cause that also plate shape problem appears in the respective specification steel plate, then needs water ratio is further optimized.At first study the uneven and bent characteristic relation of steel plate wooden dipper of steel plate upper and lower surface water-cooled.Two kinds of variations take place in steel plate volume in actual cooling procedure, and the one, owing to falling, steel billet temperature causes volume contraction, the 2nd, steel plate generation structural transformation generation volumetric expansion, so actual volume change procedure more complicated.The present invention adopts heat-phase transformation coupling finite element technique to carry out the research of steel plate water-cooled inequality and Volume Changes relation, the volumetric expansion that structural transformation causes is coupled to by thermal coefficient of expansion with the Volume Changes that temperature causes.
By calculate finding, when steel plate upper surface intensity of cooling during greater than lower surface, when water-cooled finishes if the steel plate phase transformation does not finish, steel-plate shape then is button form down, but behind aligning, steel plate has temporarily been eliminated the wooden dipper song, and steel plate is finished the residue phase transition process on cold bed subsequently.Because the structural transformation amount that the steel plate upper surface takes place in the water-cooled process is bigger than lower surface, so the upper surface residue does not change percentage by volume less than lower surface, so steel plate thickness the first half will at first finish structural transformation, after the first half structural transformation is finished, have only the latter half will proceed structural transformation, the Volume Changes of upper and lower surface is with disequilibrium, volumetric expansion will take place with respect to upper surface steel plate the latter half, the wooden dipper bent plate shape that this moment, steel plate will upwarp, why Here it is aligns the main cause that the wooden dipper song still might take place the back flat plate once more on cold bed.When steel plate upper surface intensity of cooling during less than lower surface, wooden dipper Qu Fangxiang is opposite.Physical relationship sees the following form:
Parameter regulation means is as follows:
When aligning back steel plate occurs that the button wooden dipper is bent under the whole plate, reduce water make a gesture of measuring into:
ΔR＝0.0005*ΔD+0.0015*h；
Button under steel plate head/tail only occurs, can not carry out the flow-rate ratio adjustment, only corresponding increase upper header hides coefficient or reduces corresponding lower collector pipe and hides coefficient, and adjustment amount is
Δm＝0.0002*ΔD+0.0015*h
In the formula: h is steel plate thickness (mm), and Δ D steel plate wooden dipper Qu Buping amount (mm) in like manner can be carried out the plate shape parameter and oppositely regulates upwarping steel plate.
Fig. 1 is the straight pairing water ratio of different collector flows of the assurance water-cooling plate of 22mm thickness steel plate, is calculated by R=0.0149*h+0.33Ln (F)-0.294 formula to obtain, and the h in the formula is 22, and the F excursion is 200～500.
Fig. 2 and Fig. 3 represent is when the steel plate inhomogeneous cooling, during upper surface＞lower surface intensity of cooling, steel plate in water-cooled and on the cold bed the Volume Changes feature.When steel plate begins to undergo phase transition in the water-cooled process because the upper surface intensity of cooling is big, so upper surface prior to lower surface generation structural transformation, and during the water-cooled end upper surface transformation amount always greater than lower surface.Because phase transition process is the volumetric expansion process, just in time the Volume Changes that causes with the temperature inequality is opposite, and the volume change that phase transformation causes is greater than temperature action, so the steel plate upper surface when eventually cold the volumetric expansion amount greater than lower surface, following button phenomenon as shown in Figure 2 appears when water-cooled finishes, but steel plate is temporarily eliminated the wooden dipper song after aligning, on cold bed, continue to take place structural transformation, because the structural transformation amount that the steel plate upper surface takes place in cooling procedure is bigger than lower surface, so the upper surface residue does not change percentage by volume less than lower surface, so steel plate thickness the first half at first finishes phase transition process, after the first half structural transformation is finished, the latter half will be proceeded structural transformation, the Volume Changes of upper and lower surface is with disequilibrium, volumetric expansion will take place with respect to upper surface steel plate the latter half, this moment steel plate will take place as shown in Figure 3 finally upwarp wooden dipper bent plate shape.
Fig. 4 and Fig. 5 are respectively the common curved attitude of production board shape wooden dipper, and Fig. 4 is the wide downward button wooden dipper song of steel plate: illustrate that the steel plate lower surface is cold excessively, should reduce water ratio, decrease is Δ R=0.0005* Δ D+0.0015*h; When button only occurring under steel plate head/tail, do not carry out the flow-rate ratio adjustment, be that corresponding increase upper header hides coefficient delta m=0.0002* Δ D+0.0015*h or reduces corresponding lower collector pipe and hides coefficient; Fig. 5 is the wide wooden dipper song of tilting upward of steel plate, illustrates that the steel plate upper surface is cold excessively, should increase water and make a gesture of measuring Δ R=0.0005* Δ D+0.0015*h; Upwarping when steel plate head/tail only occurring, do not carry out the flow-rate ratio adjustment, is that corresponding reduction upper header hides coefficient delta m=0.0002* Δ D+0.0015*h or reduces corresponding lower collector pipe and hides coefficient; In the formula: h is steel plate thickness (mm), and F is upper header flow (L/m
2.min), Δ D steel plate wooden dipper Qu Buping amount (mm)
Embodiment 1: button wooden dipper song under the whole plate, water-cooled upper header flow 300L/m take place in certain thickness 22mm steel plate
2.min, wooden dipper Qu Gaodu is about 150mm, carry out water so than adjusting, adjustment amount is Δ R=0.0005*150+0.0015*22=0.108, because button wooden dipper song under being that steel plate takes place should reduce water ratio, the former water ratio under this thickness specification, the flow condition is 1.92, should be adjusted into R=1.92-0.108=1.812, all the other parameter constants.
If this wooden dipper song only occurs in steel plate head, do not carry out the adjustment of R water ratio so, only adjust the head shadow amount, the sheltering coefficient adjustment amount is Δ m=0.0002*150+0.0015*22=0.063, because button wooden dipper song under being that head takes place illustrates that the upper surface cooling is not enough, so both can increase the upper surface sheltering coefficient, can not adjust by upper surface yet, and reduce lower surface, promptly
M_htop=m_htop
0+ Δ m=0.8+0.063=0.863, all the other parameter constants or, m_hbot=m_hbot
0-Δ m=0.7-0.063=0.637
Embodiment 2: with thickness 22mm steel plate is example, when the upper header flow is 300L/m
2.min the time, determine according to formula (1):
R＝0.0149*22+0.33*Ln(300)-0.294＝1.92
So reasonably the lower collector pipe flow should be 300*1.78=576;
In like manner can get, steel plate head upper header flow is 0.8*300=240, and head lower collector pipe flow is 0.7*576=403, and afterbody upper header flow is 0.9*300=270, and afterbody lower collector pipe flow is 0.8*576=461.
If this wooden dipper song only occurs in steel plate head, do not carry out the adjustment of R water ratio so, only adjust the head shadow amount, the sheltering coefficient adjustment amount is Δ m=0.0002*150+0.0015*22=0.063, because button wooden dipper song under being that head takes place illustrates that the upper surface cooling is not enough, so both can increase the upper surface sheltering coefficient, can not adjust by upper surface yet, and reduce lower surface, promptly
M_htop=m_htop
0+ Δ m=0.8+0.063=0.863, all the other parameter constants
Or, m_hbot=m_hbot
0-Δ m=0.7-0.063=0.637
Claims (2)
1, a kind of control method of hot-rolled steel sheet water-cooling plate, solve the plate shape wooden dipper Qu Wenti that steel plate causes because of water-cooled is inhomogeneous by disposing cooling water collector flow-rate ratio and hiding coefficient end to end, it is characterized in that: by stream thermal coupling numerical simulation technology, lower collector pipe and surface of steel plate heat transfer characteristic on the pipe laminar flow are studied, for certain nozzle number, nozzle diameter, nozzle height, the upper header of roller-way spacing and lower collector pipe, set up the quantitative relationship between surface of steel plate thermal force and the collector flow, and set up in view of the above with flow, the declinable lower collector pipe initial water that goes up of finger gauge compares function, down rational/upper header flow-rate ratio R presses the following formula functional relation and quantitatively determines:
R＝0.0149*h+0.33Ln(F)-0.294 (1)
Wherein: h is steel plate thickness (mm), and F is upper header flow (L/m
2.min) cooperate simultaneously and a certain amount ofly hide end to end, sheltering coefficient is end to end,
m_htop
0＝0.8；m_hbot
0＝0.7
m_ttop
0＝0.9；m_tbot
0＝0.8
M_htop
0Be head upper header sheltering coefficient, m_hbot
0Be head lower collector pipe sheltering coefficient, m_ttop
0Afterbody upper header sheltering coefficient, m_tbot
0Be afterbody lower collector pipe sheltering coefficient.
2. control method of hot-rolled steel sheet water-cooling plate as claimed in claim 1 is characterized in that: according to plate shape situation, on former water ratio and sheltering coefficient basis, optimizes and revises accordingly, and the control water-cooling plate, concrete steps are as follows:
1) at first checks steel plate wooden dipper Qu Fangxiang, determine upwarping the wooden dipper song or descending button wooden dipper song of steel plate generation;
2) determine steel plate upper and lower surface inhomogeneous cooling relation, if steel plate takes place is to upwarp the wooden dipper song, then explanation is a upper surface cooling＞lower surface, should add big flood ratio, i.e. R+ Δ R behind the straightening process; If button wooden dipper song under being that steel plate takes place, then explanation is a upper surface cooling＜lower surface, should reduce water ratio, i.e. R-Δ R;
3) the water ratio amount Δ R of Tiao Zhenging is determined by formula (2):
ΔR＝0.0005*ΔD+0.0015*h (2)
When steel plate head/tail wooden dipper song only occurring, do not carry out the flow-rate ratio adjustment, just carry out corresponding sheltering coefficient adjustment according to step 3, adjustment amount is determined by formula (3)
Δm＝0.0002*ΔD+0.0015*h (3)
In the formula: h is steel plate thickness (mm), and F is upper header flow (L/m
2.min), Δ D steel plate wooden dipper Qu Buping amount (mm)
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| CN101885004A (en) * | 2010-06-13 | 2010-11-17 | 南京钢铁股份有限公司 | Method for controlling shape of low-alloy high-strength steel plate in controlled cooling phase |
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| CN101885004A (en) * | 2010-06-13 | 2010-11-17 | 南京钢铁股份有限公司 | Method for controlling shape of low-alloy high-strength steel plate in controlled cooling phase |
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| CN106269905A (en) * | 2015-05-20 | 2017-01-04 | 宝山钢铁股份有限公司 | A kind of control method solving hot-rolling high-strength steel intensive cooling zone discount steel scrap |
| CN109731919A (en) * | 2018-12-27 | 2019-05-10 | 西南铝业（集团）有限责任公司 | A kind of control method for hot rolling aluminium alloy plate transverse direction unevenness |
| CN109759445A (en) * | 2019-01-25 | 2019-05-17 | 舞阳钢铁有限责任公司 | Control the production method of TMCP shape steel plate performance difference end to end |
| CN113423517A (en) * | 2019-02-07 | 2021-09-21 | 杰富意钢铁株式会社 | Cooling control method and cooling control device for thick steel plate, and thick steel plate manufacturing method |
| CN110548763A (en) * | 2019-08-22 | 2019-12-10 | 南京钢铁股份有限公司 | Method for reducing buckling of thick plate |
| CN113083916A (en) * | 2021-04-30 | 2021-07-09 | 南京钢铁股份有限公司 | Method for improving buckling of head of thick plate after shearing by heavy and medium plate mill |
| CN113083916B (en) * | 2021-04-30 | 2022-08-19 | 南京钢铁股份有限公司 | Method for improving buckling of head of thick plate after shearing by heavy and medium plate mill |
| CN114178322A (en) * | 2021-11-23 | 2022-03-15 | 北京科技大学 | Key process parameter interval setting method for influencing potential plate shape |
| CN114178322B (en) * | 2021-11-23 | 2023-01-20 | 北京科技大学 | Key process parameter interval setting method for influencing potential plate shape |
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Open date: 20090415 |