CN107175264A - A kind of hot-rolled thick plank swings cooling means - Google Patents
A kind of hot-rolled thick plank swings cooling means Download PDFInfo
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- CN107175264A CN107175264A CN201710474057.9A CN201710474057A CN107175264A CN 107175264 A CN107175264 A CN 107175264A CN 201710474057 A CN201710474057 A CN 201710474057A CN 107175264 A CN107175264 A CN 107175264A
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- cooling
- steel plate
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- cooling means
- swing
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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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Abstract
A kind of hot-rolled thick plank swings cooling means, belongs to Rolling production cooling technology field.Specific embodiment is：The complete rear 50~200mm of thickness range of finish rolling steel plate, online acceleration cooled region is transported to by transmission roller channel, uses swing cooling means to be cooled to 250~750 DEG C 800~1000 DEG C of steel plate of temperature, cold bed is delivered to by straightener after the completion of cooling.The present invention swings cooling using step-by-step movement in cooling zone, it is interval by choosing suitable swing, setting cooler and open the technological parameters such as amplitude, forward and reverse swinging distance and stepping oscillating roller way speed, realize the uniform cooling of swing process light plate total length, total length steel billet temperature is poor≤and 8 DEG C.Solve and use the problem of required target temperature can not be cooled to by formula cooling more than 50mm steel plates；Also the problem of solving using front and rear finish rolling, aligning process and rolling rhythm is influenceed by formula swing cooling means.Swing and cool down by using step-by-step movement, improve Heavy plate production rolling rhythm, production efficiency improves 24%.
Description
Technical field
The invention belongs to Rolling production cooling technology field cooling means is swung there is provided a kind of hot-rolled thick plank.
Background technology
Roll line control cooling system is by controlling opening cold temperature, roller repairing speed and final cooling temperature and controlling steel for rolled piece
The high temperature austenite tissue morphology and phase transition process of material, organization type, form and the distribution of final control steel, reach refinement
Crystal grain, improves the intensity of steel plate and the purpose of toughness.Steel sheet production line is generally using the arrangement control cooling device after finishing mill
Method carry out low-alloy steel, steel for engineering machinery, deck of boat steel, the exploitation and production of the kind such as pipe line steel.In addition, for nothing
The steel plate of phase transformation and organizational process need to be controlled, control cooling is notable for the cooling meaning of steel plate, can be greatly decreased in workshop
Environment temperature and the pressure for reducing cold bed.
The control cooling of hot-rolled thick plank is always a difficult problem in Heavy Plate Production.It is 50- 200mm thick for finished product
Steel plate, cooling target temperature is unable to reach by formula cooling using tradition, the control of influence steel plate organization type or steel plate
Cooling.By the limitation such as technology arrangement, vehicle headway and investment, unrestricted increase cooling section length is cooled down with meeting slab by formula
Way it is undoubtedly unrealistic.In order to solve above-mentioned problem, domestic many production lines use the method for swinging cooling by formula to realize
Slab is cooled down, so-called to be swung by formula, i.e., whole steel plate by and all go out cooling zone and return again to cooling zone and cooled down, follow
The reciprocal several passages of ring complete the cooling of steel plates, the method be the cooling of slab especially special heavy plate provide that one kind is technologic can
Energy.But its drawback is also evident from, multi-pass is cooled down by formula because steel plate belongs to, repeatedly occupancy is needed in cooling procedure is swung
Cooling zone and its front and rear roller-way, thus clash with finishing mill and straightener process, have a strong impact on rhythm of production.Therefore,
It is badly in need of exploitation a kind of different from the new hot-rolled thick plank swinging method cooled down by formula, to ensure not interfering with work before and after cooling
Sequence.
Patent of invention《A kind of middle base tilts injection stream cooling and board-shape control method》(application number/the patent No.：
201610700464.2) the reciprocating refrigerating mode of middle base is mentioned in or by formula refrigerating mode, its reciprocating refrigerating mode is
Refrigerating mode, and the finished steel plate of the steel plate of cooling non-invention for middle base are swung by formula.
Recently, as the dimensions of market demand of slab especially special heavy plate is increasing, it controls cooling equipment and process
It is badly in need of realizing and breaks through.Current most domestic Heavy Plate Production line configures online acceleration cooling device, control cooling section length
Unrestricted increase has little significance, therefore it is a kind of different from the new hot-rolled thick plank swinging method cooled down by formula to be badly in need of exploitation, with
Guarantee does not interfere with finish rolling, aligning process and rolling rhythm.And accelerate cooling online by Domestic Plate production line slab is solved
Problem, with huge promotional value.
The content of the invention
Cooling means, i.e. step-by-step movement are swung it is an object of the invention to provide a kind of hot-rolled thick plank and swings cooling means, using this
Method is solved uses the problem of can not being cooled to required target temperature by formula cooling more than 50mm steel plates, solves use
The problem of cooling means is swung by formula and front and rear finish rolling, aligning process and rolling rhythm is influenceed.
The technical scheme is that：A kind of hot-rolled thick plank swings cooling means, and production stage is as follows：
Step 1：The complete rear 50~200mm of thickness range of finish rolling steel plate, online acceleration cooling zone is transported to by transmission roller channel
Domain；
Step 2：Swing cooling means is used to be cooled to 250~750 DEG C 800~1000 DEG C of steel plate of temperature；
Step 3：Cold bed is delivered to by straightener after the completion of cooling.
Described hot-rolled thick plank swings cooling means and uses step-by-step movement swing cooling means, i.e. steel plate swings limit of interval
System is in cooled region, until cooling completes just to leave cooled region.
Described hot-rolled thick plank, which swings cooling means, need to determine that step-by-step movement swings cooler and opens amplitude L+K*l.Wherein K is
Integer, 1<K≤6 and K≤(L '-L)/l；L is steel plate length, and l is spacing between cooler, and L ' is cooling section length.To ensure steel
Plate is limited in the interior cooling of cooled region and steel plate total length is uniformly cooled down.
Described hot-rolled thick plank, which swings cooling means, need to determine that step-by-step movement swings positive swinging distance N*l, and step-by-step movement is swung
Backswing distance (N-0.5*M) * l.Wherein N is integer, 1<N≤6 and N≤(L '-L)/l；M is odd number, M>0 and M<2N-1；L
For steel plate length, l is spacing between cooler, and L ' is cooling section length.To ensure that steel plate is limited in cooling and steel in cooled region
Plate total length is uniformly cooled down.
The stepping oscillating roller way velocity interval that described hot-rolled thick plank swing cooling means is used is ± 0.30~0.80m/
S, setting speed lower limit ensures that steel plate is not slided with roller-way, to ensure plate surface quality.
Steel plate is online to accelerate cooling zone to consider according to 20 meters long with 50~200mm thickness, a length of representatives of 6-16m, adds online
But device portal is with finishing mill distance by 40-70 meters of calculating for quickly cooling, and 30- is pressed in online accelerated cooling device outlet with straightener distance
70 meters of calculating.Above-mentioned process conditions are cooled down using tradition by formula, and finish rolling, aligning process will be disturbed in steel plate cooling procedure,
Have a strong impact on rhythm of production.Cooling means is swung using step-by-step movement, refrigerating work procedure is swung independently and does not influence front and rear process, is improved
Heavy plate production rolling rhythm and production efficiency.
Hot-rolled thick plank swing cooling major advantage for the present invention is as follows：
(1) cooling means is swung using step-by-step movement in cooled region, front and rear finish rolling, aligning process and rolling section is not influenceed
Play；
(2) swing and cool down by using step-by-step movement, Heavy plate production efficiency improves 24%.
(3) according to cooling section length and steel plate length rationally determine to swing cooler open amplitude, it is positive swinging distance, anti-
To swinging distance, it is ensured that steel plate is cooled down in cooling zone, technique application is flexible；
(4) stepping oscillating roller way velocity interval is ± 0.30~0.80m/s, it is ensured that steel plate is not slided with roller-way,
To ensure plate surface quality；
(5) the uniform cooling that cooling means realizes total length steel billet temperature is swung by using step-by-step movement in cooled region, entirely
Long steel billet temperature is poor≤and 8 DEG C；
Based on preceding method, the present invention uses step-by-step movement swing cooling means, i.e. steel plate swing interval and is limited in cold
But in region, until cooling completes just to leave cooled region, it is to avoid with the interference of forward and backward process.
Based on preceding method, the present invention need to determine that stepping swings cooler and opens amplitude L+K*l.Wherein K is integer, 1<K
≤ 6 and K≤(L '-L)/l；L is steel plate length, and l is spacing between cooler, and L ' is cooling section length.With cool down section length L '=
Between 20 meters, L=8 meters of steel plate length and cooler exemplified by l=1 meters of spacing, K=4 is selected, then it is 12 to swing cooler and open amplitude
Rice, cooler opens 12 groups of coolers simultaneously.Rationally determine that swinging cooler opens width according to cooling section length and steel plate length
Degree, it is ensured that steel plate is limited in cooled region cooling and steel plate total length is uniformly cooled down, total length steel billet temperature is poor≤and 8 DEG C.
Based on preceding method, the present invention need to determine that stepping swings positive swinging distance N*l, and stepping swings backswing distance
(N-0.5*M)*l.Wherein N is integer, 1<N≤6 and N≤(L '-L)/l；M is odd number, M>0 and M<2N-1；L is steel plate length,
L is spacing between cooler, and L ' is cooling section length.To cool down between section length L '=20 meter, L=8 meters of steel plate length and cooler
Exemplified by l=1 meters of spacing, N=3 is selected, then positive swinging distance is 3 meters to M=1, and backswing distance is 2.5 meters, often completes one
Secondary positive and negative swing, travel distance is 0.5 meter to steel plate forward.According to cooling section length and steel plate length, forward and reverse pendulum is rationally determined
Dynamic distance, it is ensured that steel plate is limited in cooled region cooling and steel plate total length is uniformly cooled down, total length steel billet temperature is poor≤and 8 DEG C.
Based on preceding method, the stepping oscillating roller way velocity interval that the present invention is used is ± 0.30~0.80m/s.Usual steel
Roller table speed is more low in plate cooling procedure more is conducive to the cooling of steel plate, but for steel plate because its excessive reason of conducting oneself with dignity is in roller
Road speed is less than in the case of 0.25m/s easily produces slip with roller.Therefore setting speed lower limit ensures that steel plate is not sent out with roller-way
It is raw to slide, to ensure plate surface quality.
The present invention is applied widely, can be widely used in Heavy Plate Production line, meets the online of 50~200mm slabs and adds
Quickly cooling but technological requirement.Present invention process parameter setting flexibly, can preferably adapt to existing most domestic and accelerate cooling online
Technology arrangement, strong adaptability.It will be replaced using the present invention and traditional cooling means be swung by formula, it is ensured that do not influenceed finish rolling, rectify
Straight process and rolling rhythm, it is ensured that the production efficiency of slab, thoroughly solve domestic slab on-line cooling problem, are pushed away with huge
Wide value.
Brief description of the drawings
Accompanying drawing 1 is the structural representation of the online accelerated cooling process of the present invention.
1- finishing mills, 2-1# pyrometers, 3-1# steel plates detector, the online acceleration cooling systems of 4-, 5-2# steel plates detector,
6-2# pyrometers, 7-3# steel plates detector, 8- straighteners；
Accompanying drawing 2 swings the structural representation of cooling technique for the hot-rolled thick plank step-by-step movement of the present invention.
9-l coolers spacing, 10-L steel plate lengths, 11-L ' coolings section length, the upper coolers of 12-, cooler under 13-,
14- a time is rotated forward, 15-BF coolers open amplitude, 16-ZB forward directions swinging distance, the passages of 17- bis- are inverted, 18-FB is reverse
Swinging distance, the passages of 19- tri- are rotated forward.
Embodiment
Embodiment one：Exemplified by producing 86mm thickness Q235B steel plates, length 8m, finishing mill outlet distance accelerates cooling entrance
40m, accelerates coolant outlet apart from straightener inlet 38m, roller table speed is 0.45m/s.The step-by-step movement pendulum arranged using accompanying drawing 1-2
Its method is further described exemplified by the application technology of dynamic cooling technique.Steel billet temperature after the finishing mill of accompanying drawing 1 (1) rolls is 989
DEG C, carry out steel signal through 1# pyrometers (2) thermometric in accompanying drawing 1 and 1# steel plates detector (3) detection, steel plate is delivered into accompanying drawing 1
Online acceleration cooling system (4), is cooled down using cooler (12) on accompanying drawing 2 and lower cooler (13).Other related process
Parameter setting is as follows：L coolers spacing (9) is that 1m, L steel plate length (10) are 8m, L in accompanying drawing 2 ' cooling section length (11) be
20m.Steel plate carries out a time of accompanying drawing 2 and rotates forward BF coolers unlatching amplitude (15) L+K*l=12m (K=in (14) cooling, accompanying drawing 2
4) 13 groups of cooler coolings, are opened, steel plate forward direction runs into accompanying drawing 2 ZB forward directions swinging distance (16) Nl=3m (N=3) place,
Steel plate carries out the passage of accompanying drawing 2 two reversion (17) cooling, steel plate inverted running FB backswings distance (18) (N- into accompanying drawing 2
0.5*M) * l=2.5m (N=3, M=1) place, steel plate carries out the passage of accompanying drawing 2 three and rotates forward (19) cooling, until cooling completion is left
Cooling zone.2# pyrometers (6) thermometric and the detection of 3# steel plates in steel plate, accompanying drawing 1 are detected by 2# steel plates detector (5) in accompanying drawing 1
Device (7) detection carrys out steel signal, and steel plate delivers into straightener (8) in accompanying drawing 1.Finally, steel plate is cooled to 782 DEG C, total length steel plate
Temperature difference≤6 DEG C, the production time saves 20%, meets technological requirement.
Embodiment two：Exemplified by producing 62mm thickness Q345B steel plates, length 10m, finishing mill outlet distance accelerates cooling entrance
40m, accelerates coolant outlet apart from straightener inlet 38m, roller table speed is 0.50m/s.The step-by-step movement pendulum arranged using accompanying drawing 1-2
Its method is further described exemplified by the application technology of dynamic cooling technique.Steel billet temperature after the finishing mill of accompanying drawing 1 (1) rolls is 912
DEG C, carry out steel signal through 1# pyrometers (2) thermometric in accompanying drawing 1 and 1# steel plates detector (3) detection, steel plate is delivered into accompanying drawing 1
Online acceleration cooling system (4), is cooled down using cooler (12) on accompanying drawing 2 and lower cooler (13).Other related process
Parameter setting is as follows：L coolers spacing (9) is that 1m, L steel plate length (10) are 10m, L in accompanying drawing 2 ' cooling section length (11) be
20m.Steel plate carries out a time of accompanying drawing 2 and rotates forward BF coolers unlatching amplitude (15) L+K*l=15m (K=in (14) cooling, accompanying drawing 2
5) 16 groups of cooler coolings, are opened, steel plate forward direction runs into accompanying drawing 2 ZB forward directions swinging distance (16) Nl=4m (N=4) place,
Steel plate carries out the passage of accompanying drawing 2 two reversion (17) cooling, steel plate inverted running FB backswings distance (18) (N- into accompanying drawing 2
0.5*M) * l=3.5m (N=4, M=1) place, steel plate carries out the passage of accompanying drawing 2 three and rotates forward (19) cooling, until cooling completion is left
Cooling zone.2# pyrometers (6) thermometric and the detection of 3# steel plates in steel plate, accompanying drawing 1 are detected by 2# steel plates detector (5) in accompanying drawing 1
Device (7) detection carrys out steel signal, and steel plate delivers into straightener (8) in accompanying drawing 1.Finally, steel plate is cooled to 732 DEG C, total length steel plate
Temperature difference≤5 DEG C, the production time saves 28%, meet technological requirement.
Claims (4)
1. a kind of hot-rolled thick plank swings cooling means, it is characterised in that：Production stage is as follows：
Step 1：The complete rear 50~200mm of thickness range of finish rolling steel plate, online acceleration cooled region is transported to by transmission roller channel；
Step 2：Swing cooling means is used to be cooled to 250~750 DEG C 800~1000 DEG C of steel plate of temperature；
Step 3：Cold bed is delivered to by straightener after the completion of cooling；
Step-by-step movement swing cooling means is wherein used in step 2, i.e. steel plate swings interval and is limited in cooled region, until
Cooling completes just to leave cooled region.
2. a kind of hot-rolled thick plank according to claim 1 swings cooling means, it is characterised in that：Stepping swings cooler and opened
Amplitude L+K*l is opened, wherein K is integer, 1<K≤6 and K≤(L '-L)/l；L is steel plate length, and l is spacing between cooler, and L ' is
Cool down section length.
3. a kind of hot-rolled thick plank according to claim 1 swings cooling means, it is characterised in that：Step-by-step movement swings positive pendulum
Dynamic distance is defined as N*l, and step-by-step movement swings backswing distance and is defined as (N-0.5*M) * l；Wherein N is integer, 1<N≤6 and N
≤(L’-L)/l；M is odd number, M>0 and M<2N-1；L is steel plate length, and l is spacing between cooler, and L ' is cooling section length.
4. a kind of hot-rolled thick plank according to claim 1 swings cooling means, it is characterised in that：Step-by-step movement oscillating roller way speed
Degree scope is ± 0.30~0.80m/s.
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| CN201710474057.9A CN107175264B (en) | 2017-06-21 | 2017-06-21 | A kind of hot-rolled thick plank swing cooling means |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111069309A (en) * | 2019-12-10 | 2020-04-28 | 北京科技大学 | Method for improving cooling temperature precision of bainite steel after rolling |
| CN111069307A (en) * | 2019-12-09 | 2020-04-28 | 北京科技大学 | Medium plate intermediate cooling method suitable for multiple processes |
| CN114934229A (en) * | 2022-05-25 | 2022-08-23 | 柳州钢铁股份有限公司 | NG-TMCP technology-based wear-resistant steel with complex phase structure and production method thereof |
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| JPS5448667A (en) * | 1977-09-26 | 1979-04-17 | Nippon Kokan Kk <Nkk> | Manufacturing equipment for thick steel plate |
| JPS6068107A (en) * | 1983-09-24 | 1985-04-18 | Kawasaki Steel Corp | Method and device for cooling hot rolled steel sheet |
| CN101209456A (en) * | 2006-12-27 | 2008-07-02 | 鞍钢股份有限公司 | Production method of high-strength medium-thickness steel plate |
| CN102284522A (en) * | 2011-08-30 | 2011-12-21 | 北京科技大学 | Online accelerated cooling method with function of pre-straightening |
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2017
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS5448667A (en) * | 1977-09-26 | 1979-04-17 | Nippon Kokan Kk <Nkk> | Manufacturing equipment for thick steel plate |
| JPS6068107A (en) * | 1983-09-24 | 1985-04-18 | Kawasaki Steel Corp | Method and device for cooling hot rolled steel sheet |
| CN101209456A (en) * | 2006-12-27 | 2008-07-02 | 鞍钢股份有限公司 | Production method of high-strength medium-thickness steel plate |
| CN102284522A (en) * | 2011-08-30 | 2011-12-21 | 北京科技大学 | Online accelerated cooling method with function of pre-straightening |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111069307A (en) * | 2019-12-09 | 2020-04-28 | 北京科技大学 | Medium plate intermediate cooling method suitable for multiple processes |
| CN111069307B (en) * | 2019-12-09 | 2021-08-20 | 北京科技大学 | Medium plate intermediate cooling method suitable for multiple processes |
| CN111069309A (en) * | 2019-12-10 | 2020-04-28 | 北京科技大学 | Method for improving cooling temperature precision of bainite steel after rolling |
| CN114934229A (en) * | 2022-05-25 | 2022-08-23 | 柳州钢铁股份有限公司 | NG-TMCP technology-based wear-resistant steel with complex phase structure and production method thereof |
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| CN107175264B (en) | 2019-04-12 |
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