CN107175264B - A kind of hot-rolled thick plank swing cooling means - Google Patents
A kind of hot-rolled thick plank swing cooling means Download PDFInfo
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- CN107175264B CN107175264B CN201710474057.9A CN201710474057A CN107175264B CN 107175264 B CN107175264 B CN 107175264B CN 201710474057 A CN201710474057 A CN 201710474057A CN 107175264 B CN107175264 B CN 107175264B
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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
Abstract
A kind of hot-rolled thick plank swing cooling means, belongs to Rolling production cooling technology field.Specific embodiment is: the steel plate of 50~200mm of thickness range after finish rolling is complete, online acceleration cooled region is transported to by transmission roller channel, 800~1000 DEG C of temperature of thick steel plate is cooled to 250~750 DEG C using cooling means is swung, 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, by choosing suitable swing section, it setting cooler and opens 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 overall length, overall length steel billet temperature is poor≤and 8 DEG C.It solves the problems, such as to use more than 50mm thick steel plate and required target temperature can not be cooled to by formula cooling；Also it solves the problems, such as to influence front and back finish rolling, aligning process and rolling rhythm using by formula swing cooling means.It swings and cools 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 fields, provide a kind of hot-rolled thick plank swing cooling means.
Background technique
Roll line control cooling system opens cold temperature, roller repairing rate and final cooling temperature and controls steel by control rolled piece
The high temperature austenite tissue morphology and phase transition process of material, final organization type, form and the distribution for controlling steel, reach refinement
Crystal grain improves the intensity of steel plate and the purpose of toughness.Steel sheet production line generallys use the arrangement control cooling device after finishing mill
Method carry out the exploitation and production of low-alloy steel, steel for engineering machinery, deck of boat steel, the kinds 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 significant for the cooling meaning of steel plate, can be greatly decreased in workshop
Environment temperature and the pressure for reducing cold bed.
A difficult problem in the cooling always Heavy Plate Production of the control of hot-rolled thick plank.It is 50-200mm thick for finished product
Steel plate is unable to reach cooling target temperature by formula cooling using tradition, influences the drop of steel plate tissue Type Control or steel plate
Temperature.It is limited by technology arrangement, vehicle headway and investment etc., no limitation increases cooling section length and passes through formula cooling to meet slab
Way is undoubtedly unrealistic.In order to solve above-mentioned problem, it is thick that domestic many production lines use the method for swinging cooling by formula to realize
Plate is cooling, so-called to be swung by formula, i.e. whole steel plate passes through and whole cooling zones out return again to cooling zone and cooled down, and recycles
Reciprocal several passages 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, and since steel plate belongs to through the cooling multi-pass of formula, needs repeatedly to occupy in swinging cooling procedure
Cooling zone and its front and back roller-way, thus clash with finishing mill and straightener process, seriously affect rhythm of production.Therefore,
It is badly in need of developing a kind of novel hot-rolled thick plank swinging method different from by formula cooling, to guarantee not interfering with cooling front and back work
Sequence.
Patent of invention " a kind of intermediate base inclination injection stream cooling and board-shape control method " (application number/patent No.:
201610700464.2) the reciprocating refrigerating mode of intermediate base is mentioned in or by formula refrigerating mode, reciprocating refrigerating mode is
Refrigerating mode is swung by formula, and cooling steel plate is the finished steel plate of intermediate base and non-present invention.
Recently, as the dimensions of market demand of slab especially special heavy plate is increasing, cooling equipment and process are controlled
It is badly in need of realizing and breaks through.Most domestic Heavy Plate Production line configures the cooling equipment of online acceleration at present, controls cooling section length
Increase without limitation and have little significance, therefore is badly in need of developing a kind of novel hot-rolled thick plank swinging method different from by formula cooling, with
Guarantee does not interfere with finish rolling, aligning process and rolling rhythm.And accelerate to cool down online by Domestic Plate production line slab is solved
Problem has huge promotional value.
Summary of the invention
It is an object of the invention to provide a kind of hot-rolled thick planks to swing cooling means, i.e., step-by-step movement swings cooling means, using this
Method solves the problems, such as that required target temperature can not be cooled to using by formula cooling more than 50mm thick steel plate solve use
The problem of cooling means influences front and back finish rolling, aligning process and rolling rhythm is swung by formula.
The technical scheme is that a kind of hot-rolled thick plank swings cooling means, production stage is as follows:
Step 1: the steel plate of 50~200mm of thickness range after finish rolling is complete is transported to online acceleration cooling zone by transmission roller channel
Domain；
Step 2: 800~1000 DEG C of temperature of thick steel plate is cooled to 250~750 DEG C using cooling means is swung；
Step 3: cold bed being delivered to by straightener after the completion of cooling.
The hot-rolled thick plank swings cooling means and swings cooling means using step-by-step movement, i.e. steel plate swings limit of interval
System is in cooled region, until cooled region is just left in cooling completion.
The 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 spacing between cooler, L ' is cooling section length.To guarantee steel
Plate is limited in cooled region cooling and steel plate overall length and uniformly cools down.
The 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 spacing between cooler, L ' is cooling section length.To guarantee that steel plate is limited in cooled region cooling and steel
Plate overall length uniformly cools down.
The stepping oscillating roller way velocity interval that the hot-rolled thick plank swing cooling means uses is ± 0.30~0.80m/
S, setting speed lower limit guarantees that steel plate is not slided with roller-way, to guarantee plate surface quality.
Thick steel plate thick, a length of representative of 6-16m with 50~200mm, it is online to accelerate cooling zone according to 20 meters of long considerations, it is online to add
But by 40-70 meters of calculating, 30- is pressed with straightener distance in online accelerated cooling device outlet to quickly cooling for device portal and finishing mill distance
70 meters of calculating.Above-mentioned process conditions are cooling by formula using tradition, and finish rolling, aligning process will be interfered in thick steel plate cooling procedure,
Seriously affect rhythm of production.Cooling means is swung using step-by-step movement, cooling process is swung independently and does not influence front and back process, is improved
Heavy plate production rolling rhythm and production efficiency.
It is as follows that cooling major advantage is swung for hot-rolled thick plank of the invention:
(1) cooling means is swung using step-by-step movement in cooled region, does not influence front and back finish rolling, aligning process and rolling section
It plays；
(2) it swings and cools down by using step-by-step movement, Heavy plate production efficiency improves 24%.
(3) rationally determine that swinging cooler opens amplitude, positive swinging distance, anti-according to cooling section length and steel plate length
To swinging distance, it is ensured that steel plate is cooling in cooling zone, and technique is flexible in application；
(4) stepping oscillating roller way velocity interval is ± 0.30~0.80m/s, guarantees that thick steel plate is not slided with roller-way,
To guarantee plate surface quality；
(5) the uniform cooling that cooling means realizes overall 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 swings cooling means using step-by-step movement, i.e. steel plate swing section is limited in cold
But it in region, until cooled region is just left in cooling completion, avoids and is interfered with 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 spacing between cooler, L ' is cooling section length.With cool down section length L '=
Between 20 meters, L=8 meters of steel plate length and cooler for l=1 meters of spacing, K=4 is selected, then swinging cooler and opening amplitude is 12
Rice, cooler open 12 groups of coolers simultaneously.Rationally determine that swinging cooler opens width according to cooling section length and steel plate length
Degree ensure that steel plate is limited in cooled region cooling and steel plate overall length and uniformly cools down, overall 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
The spacing between cooler, L ' are cooling section length.Between cooling down between section length L '=20 meter, L=8 meters of steel plate length and cooler
For l=1 meters, N=3 is selected, then forward direction swinging distance is 3 meters to M=1, and backswing distance is 2.5 meters, every to complete once
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 swing is rationally determined
Distance ensure that steel plate is limited in cooled region cooling and steel plate overall length and uniformly cools down, overall 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 uses is ± 0.30~0.80m/s.Usual steel
The roller table speed the low in plate cooling procedure more is conducive to the cooling of steel plate, but for thick steel plate its be self-possessed it is excessive due in roller
Road speed is easy to generate sliding with roller in the case of being lower than 0.25m/s.Therefore setting speed lower limit guarantees that steel plate is not sent out with roller-way
Raw sliding, to guarantee plate surface quality.
The present invention is applied widely, can be widely used in Heavy Plate Production line, meets the online of 50~200mm slab and adds
Fast cooling technique requirement.Present invention process parameter setting is flexible, can preferably adapt to existing most domestic and accelerate to cool down online
Technology arrangement, it is adaptable.It will be replaced using the present invention and traditional cooling means swung by formula, it is ensured that do not influenced finish rolling, rectify
Straight process and rolling rhythm, guarantee the production efficiency of slab, thoroughly solve domestic slab on-line cooling problem, have huge push away
Wide value.
Detailed description of the invention
Attached drawing 1 is the structural schematic diagram of online accelerated cooling process of the invention.
1- finishing mill, 2-1# pyrometer, 3-1# steel plate detector, the online acceleration cooling system of 4-, 5-2# steel plate detector,
6-2# pyrometer, 7-3# steel plate detector, 8- straightener；
Attached drawing 2 is the structural schematic diagram that hot-rolled thick plank step-by-step movement of the invention swings cooling technique.
Cooler under the cooling section length of 9-l cooler spacing, 10-L steel plate length, 11-L ', the upper cooler of 12-, 13-,
14- a time rotates forward, 15-BF cooler opens amplitude, 16-ZB forward direction swinging distance, bis- passage of 17- invert, 18-FB is reversely put
Dynamic distance, tri- passage of 19- rotate forward.
Specific embodiment
Embodiment one: for producing 86mm thickness Q235B steel plate, length 8m, finishing mill outlet distance accelerates cooling entrance
40m accelerates coolant outlet apart from straightener inlet 38m, roller table speed 0.45m/s.Using the step-by-step movement pendulum of attached drawing 1-2 arrangement
Its method is further described for the application technology of dynamic cooling technique.Steel billet temperature after 1 finishing mill of attached drawing (1) rolls is 989
DEG C, carry out steel signal through 1# pyrometer (2) thermometric in attached drawing 1 and 1# steel plate detector (3) detection, steel plate delivers into attached drawing 1
Online acceleration cooling system (4), is cooled down using cooler (12) on attached drawing 2 and lower cooler (13).Other related process
Parameter setting is as follows: it is 8m, L that l cooler spacing (9), which is 1m, L steel plate length (10), in attached drawing 2 ' cooling section length (11) be
20m.Steel plate carries out 2 a time of attached drawing and rotates forward (14) cooling, and BF cooler opens amplitude (15) L+K*l=12m (K=in attached drawing 2
4) 13 groups of coolers coolings, are opened, steel plate forward direction is run into attached drawing 2 at ZB forward direction swinging distance (16) Nl=3m (N=3),
Steel plate carries out 2 two passage of attached drawing reversion (17) cooling, steel plate inverted running FB backswing distance (18) (N- into attached drawing 2
0.5*M) at * l=2.5m (N=3, M=1), steel plate carries out 2 three passage of attached drawing and rotates forward (19) cooling, until cooling completion is left
Cooling zone.Steel plate is detected by 2# steel plate detector (5) in attached drawing 1,2# pyrometer (6) thermometric and the detection of 3# steel plate in attached drawing 1
Device (7) detection carrys out steel signal, and steel plate delivers into straightener (8) in attached drawing 1.Finally, steel plate is cooled to 782 DEG C, overall length steel plate
Temperature difference≤6 DEG C, production time save 20%, meet technique requirement.
Embodiment two: for producing 62mm thickness Q345B steel plate, length 10m, finishing mill outlet distance accelerates cooling entrance
40m accelerates coolant outlet apart from straightener inlet 38m, roller table speed 0.50m/s.Using the step-by-step movement pendulum of attached drawing 1-2 arrangement
Its method is further described for the application technology of dynamic cooling technique.Steel billet temperature after 1 finishing mill of attached drawing (1) rolls is 912
DEG C, carry out steel signal through 1# pyrometer (2) thermometric in attached drawing 1 and 1# steel plate detector (3) detection, steel plate delivers into attached drawing 1
Online acceleration cooling system (4), is cooled down using cooler (12) on attached drawing 2 and lower cooler (13).Other related process
Parameter setting is as follows: it is 10m, L that l cooler spacing (9), which is 1m, L steel plate length (10), in attached drawing 2 ' cooling section length (11) be
20m.Steel plate carries out 2 a time of attached drawing and rotates forward (14) cooling, and BF cooler opens amplitude (15) L+K*l=15m (K=in attached drawing 2
5) 16 groups of coolers coolings, are opened, steel plate forward direction is run into attached drawing 2 at ZB forward direction swinging distance (16) Nl=4m (N=4),
Steel plate carries out 2 two passage of attached drawing reversion (17) cooling, steel plate inverted running FB backswing distance (18) (N- into attached drawing 2
0.5*M) at * l=3.5m (N=4, M=1), steel plate carries out 2 three passage of attached drawing and rotates forward (19) cooling, until cooling completion is left
Cooling zone.Steel plate is detected by 2# steel plate detector (5) in attached drawing 1,2# pyrometer (6) thermometric and the detection of 3# steel plate in attached drawing 1
Device (7) detection carrys out steel signal, and steel plate delivers into straightener (8) in attached drawing 1.Finally, steel plate is cooled to 732 DEG C, overall length steel plate
Temperature difference≤5 DEG C, production time save 28%, meet technique requirement.
Claims (1)
1. a kind of hot-rolled thick plank swings cooling means, it is characterised in that: production stage is as follows:
Step 1: the steel plate of 50~200mm of thickness range after finish rolling is complete is transported to online acceleration cooled region by transmission roller channel；
Step 2: 800~1000 DEG C of temperature of thick steel plate is cooled to 250~750 DEG C using cooling means is swung；
Step 3: cold bed being delivered to by straightener after the completion of cooling；
Wherein swinging cooling means using step-by-step movement in step 2, i.e. steel plate swings section and is limited in cooled region, until
It is cooling to complete just to leave cooled region；
Wherein: stepping swings cooler and opens amplitude L+K*I, and wherein K is integer, 1 < K≤6 and K≤(L '-L)/I；L is steel plate
Length, I spacing between cooler, L ' are cooling section length；
Step-by-step movement swings positive swinging distance and is determined as N*I, and step-by-step movement swings backswing distance and is determined as (N-0.5*M) * I；
Wherein N is integer, 1 < N≤6 and N≤(L '-L)/I；M is odd number, M>0 and M<2N-1；L is steel plate length, between I is between cooler
Away from L ' is cooling section length；
Step-by-step movement oscillating roller way velocity interval 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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| CN201710474057.9A CN107175264B (en) | 2017-06-21 | 2017-06-21 | A kind of hot-rolled thick plank swing cooling means |
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| CN107175264B true CN107175264B (en) | 2019-04-12 |
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| CN111069307B (en) * | 2019-12-09 | 2021-08-20 | 北京科技大学 | Medium plate intermediate cooling method suitable for multiple processes |
| CN111069309B (en) * | 2019-12-10 | 2021-04-06 | 北京科技大学 | Method for improving cooling temperature precision of bainite steel after rolling |
| CN114934229B (en) * | 2022-05-25 | 2023-05-05 | 广西柳州钢铁集团有限公司 | Wear-resistant steel for preparing complex phase structure based on NG-TMCP technology 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 | High-strength medium plate production process |
| 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
- 2017-06-21 CN CN201710474057.9A patent/CN107175264B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 | High-strength medium plate production process |
| CN102284522A (en) * | 2011-08-30 | 2011-12-21 | 北京科技大学 | Online accelerated cooling method with function of pre-straightening |
Non-Patent Citations (1)
| Title |
|---|
| 中厚板轧后先进冷却工艺技术的研究与应用;张田;《中国优秀硕士学位论文全文数据库》;20170315(第03期);正文55-56页，附图4.37 |
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