CN106363029A - Super-thick plate accelerated-cooling method based on inclined jet flow - Google Patents
Super-thick plate accelerated-cooling method based on inclined jet flow Download PDFInfo
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- CN106363029A CN106363029A CN201610785724.0A CN201610785724A CN106363029A CN 106363029 A CN106363029 A CN 106363029A CN 201610785724 A CN201610785724 A CN 201610785724A CN 106363029 A CN106363029 A CN 106363029A
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- heavy plate
- cooling
- special heavy
- injection
- temperature
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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
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
Abstract
The invention discloses a super-thick plate accelerated-cooling method based on inclined jet flow. According to the method, three-section type accelerated cooling for a jet flow cooling area is achieved by adopting forward jetting and reverse jetting as independent units and combined units, or adopting forward jetting, forward jetting and reverse jetting as independent units and combined units, and accelerated cooling for super-thick plates is achieved through cooling speed control of different temperature sections, surface cooling temperature control, heat return time control and matched setting of corresponding water cooling parameters. Through integrated control over different temperature sections, the cooling speed and phase change structures of the super-thick plates, cooling paths and super-thick plate cooling are organically combined, the temperature gradient in the thickness direction of the super-thick plates is greatly reduced, and a process window is provided for development of new steel types for super-thick plates with diversified performance requirements.
Description
Technical field
The present invention relates to a kind of acceleration cooling of special heavy plate or press quenching method, specifically one kind are based on inclination spray
The special heavy plate acceleration cooling method of jet.
Background technology
The wilderness demand of special heavy plate in exploitation with special heavy plate new steel grade and steel market, special heavy plate cooling becomes
Requisite processing support and technical guarantee.Special thick for the relatively low acceleration cooling special heavy plate of final cooling temperature and press quenching
Plate, traditional cooling facility for laminar flow is difficult to meet the intensity of cooling of special heavy plate and final cooling temperature demand, and ultra-fast cooling device is using often
The cooling means of rule also runs into great difficulty.
Rely on vapor cooling device, cooling facility for laminar flow and ultra-fast cooling device, in having partly/Heavy Plate Rolling Line carries out
Accelerate the production of cooling special heavy plate.The Chinese patent application (Application No. 201110358363.9) of 2011 discloses " a kind of
The production method of super-thick steel plate ", this invention produces high-performance 60-100mm thickness q345r steel plate using continuous casting billet, opens cold after rolling
Temperature 780-800 DEG C, rate of cooling is 3-6 DEG C/s, 680-730 DEG C of red temperature, but does not illustrate specific cooling means.
When plank thickness exceedes a certain numerical value and need to adopt accelerated cooling process, in the cooling zone that steel rolling production-line is limited
Carry out by formula or the cooling of swing type continuous big flow, slab surface is stronger with the heat exchange ratio of cooling water, and slab center portion is cold
But ability is weaker, causes thermograde on thickness direction larger.Carry out by formula or pendulum in the limited cooling zone of steel rolling production-line
Dynamic formula low discharge cools down, and the red temperature height of slab is it is difficult to reach technological requirement.For special heavy plate, using by formula cool down into
When row accelerates cooling, due to cooling zone limited length, roller speed is fast, easily produces " sandwich " formula steel plate, and that is, surface temperature is low, the heart
Portion temperature is high, and the intensity of cooling of cooling water and surface of steel plate is much larger than the conduction of heat of steel plate center portion and surface, its mechanical property and
Plate shape is difficult to ensure that.Roller speed is slow, and cooling back water is long in slab superficial residence time, affects heat exchange efficiency and cooling plate shape.Using
When swing type cooling carries out accelerating cooling, after plank thickness exceedes a certain value, due to thickness effect, cooling water and surface of steel plate
The conduction of heat on cooling, steel plate center portion and surface differs greatly.
It is difficult to the acceleration realizing special heavy plate is cold when being cooled down using above-mentioned vapor cooling device, cooling facility for laminar flow
But.
Content of the invention
The technical problem to be solved: a kind of special heavy plate acceleration cooling method based on inclination injection stream is provided,
Tilt jet flow cooling system (maximum flow of water amount 16000m using the double frameworks on single chassis Heavy Plate Rolling Line3/ h) realize spy
The acceleration cooling of slab, reduces the thermograde that special heavy plate accelerates surface and center portion during cooling；The method carries out three to special heavy plate
Segmentation cools down, and is controlled by the cooling rate of different temperatures section, surface chilling temperature controls, returns warm time control and corresponding water-cooled parameter
Match settings, realize special heavy plate acceleration cooling.
The technical scheme that the present invention solves above technical problem is:
A kind of special heavy plate acceleration cooling method based on inclination injection stream, the method comprises the following steps: (i) tapping temperature is
1160-1200 DEG C of blank, after De-scaling box de-scaling, enters milling train and carries out pair rolling or two-phase control rolling, after rolling terminates,
Special heavy plate enters pre-straightening machine aligning；(ii), after special heavy plate pre-straightening, carry out accelerating cooling tilting jet flow cooling system；Step
(ii) in, the cooling manifold tilting jet flow cooling system is divided 14 groups and is controlled, the 4th group of 1- is gap nozzle collector,
Including upper gap collector and lower gap collector, the 14th group of 5- is highly dense spray header, including highly dense upper header and highly dense next part
Pipe；On the 4th group of 1-, gap collector is positive injection, the 5th group of highly dense upper header contra-injection, the 6th, the 7th, the 9th, the 10th,
12nd and the 13rd group of highly dense upper header is positive injection, and the 8th, the 11st and the 14th group of highly dense upper header is contra-injection, institute
Lower gap collector and highly dense lower collector pipe is had to be positive injection；Described forward direction is sprayed and is transported for cooling current injection direction and special heavy plate
Line direction is consistent, and becomes an inclination angle with special heavy plate, and described contra-injection is cooling current injection direction and special heavy plate operation side
To contrary, and become an inclination angle with special heavy plate；Using " positive injection+contra-injection " or " positive injection+positive injection+reverse
Injection " is the jet cooling of individually unit and assembled unit；In " positive injection+contra-injection " unit, reversely highly dense upper collection
Pipe flow amount=positive highly dense upper header flow, in " positive injection+positive injection+contra-injection " unit, reversely highly dense upper header stream
Amount=positive highly dense upper header flow+(60-100) m3/ h, wherein, the 4th group of gap nozzle collector of 1- and the 5th group of highly dense nozzle
Collector is not opened；Using three-stage cooling, when cooling down for the first time, between 0.5-0.8m/s, special heavy plate surface cools down speed to roller speed
In 5-7 DEG C/s, leaving water temperature controls at 600-650 DEG C degree；After special heavy plate afterbody leaves inclination jet flow cooling system outlet, profit
Realize special heavy plate surface with roller-way reversing time and return temperature, special heavy plate enters injection stream cooling system with the roller speed of 0.5-0.8m/s
System carries out second cooling, and between 3-5 DEG C/s, leaving water temperature controls at 550-600 DEG C special heavy plate surface rate of cooling；Special thick
After plate afterbody leaves inclination jet flow cooling system entrance, realize special heavy plate surface using roller-way reversing time and return temperature, special heavy plate
Enter jet flow cooling system with the roller speed of 0.5-0.8m/s to carry out cooling down for the third time, special heavy plate surface rate of cooling is in 3-
Between 5 DEG C/s, red temperature is between 450-600 DEG C.
The technical scheme that the present invention limits further is:
The aforesaid special heavy plate acceleration cooling method based on inclination injection stream, wherein, the 1st group of collector distance between center line milling train center
Line 79000mm, the 14th group of collector distance between center line milling train centrage 97000mm, tilt the heat inspection of jet flow cooling system entrance
Physical location 72880mm, the cold inspection physical location 101880mm of outlet, when the cold inspection first tilting jet flow cooling system outlet
Secondary detect special heavy plate afterbody reach when, roller-way invert, special heavy plate to milling train direction run, when tilt jet flow cooling system enter
Mouthful heat inspection when special heavy plate and its afterbody is detected for the second time and reaching physical location 75580mm, roller-way inverts, and special heavy plate is to remote
Run from milling train direction.
The aforesaid special heavy plate acceleration cooling method based on inclination injection stream, the thickness of special heavy plate is 80-250mm.
The aforesaid special heavy plate acceleration cooling method based on inclination injection stream, in three-stage cooling, special heavy plate enters coolant-temperature gage
770-1000 DEG C, special heavy plate, from tilting jet flow cooling system entrance to Way out operation, carries out cooling down for the first time, special heavy plate
After afterbody leaves inclination jet flow cooling system, water outlet upper table temperature 600-650 DEG C, water outlet following table temperature 570-610 DEG C；Roller-way
Reversion, roller table speed is changed into reverse from forward direction, and special heavy plate is redirected back into jet flow cooling system and carries out second cooling, enters
Table temperature 650-720 DEG C waterborne, enters under water table temperature 620-690 DEG C, and temperature is returned on special heavy plate surface, and second cooling of special heavy plate terminates
Afterwards, water outlet upper table temperature 550-600 DEG C；After special heavy plate afterbody leaves inclination jet flow cooling system entrance, roller-way inverts, roller-way
From being reversely changed into positive, special heavy plate upper table returns temperature 620-700 DEG C to speed, and special heavy plate enters jet flow cooling system and enters
Row third time cools down, and reduces the thermograde on special heavy plate surface and center portion further, and it is cold that special heavy plate afterbody leaves inclination injection stream
But after system outlet, water outlet upper table temperature 400-530 DEG C, water outlet following table temperature 380-510 DEG C, special heavy plate red temperature is 450-
600℃.
The invention has the beneficial effects as follows: (1) three-stage accelerates cooling to avoid the generation of " sandwich " formula special heavy plate, significantly
Reduce the histological difference on the thermograde of special heavy plate surface and center portion and thickness direction；(2) three-stage accelerates cooling to utilize
While roller-way reversing time is realized special heavy plate surface and returned temperature twice, can achieve the control returning phase-change organization during temperature, favorably
In the special heavy plate obtaining diversified performance requirement, it is that the exploitation of special heavy plate new steel grade provides process window；(3) three-stage accelerates
Cooling special heavy plate, takes into account the heat exchange that cooling water is with special heavy plate surface and the conduction of heat of special heavy plate surface and center portion, improves cold
But efficiency；(4) three-stage cooling means passes through the overall-in-one control schema of special heavy plate different temperatures section, cooling rate and phase-change organization, will be cold
But path and special heavy plate cooling organically combine, and realize special heavy plate and accelerate cooling.
Brief description
Fig. 1 is the arrangement schematic diagram of single chassis Heavy Plate Rolling Line in the present invention.
In figure, 1 heating furnace, 2 De-scaling boxs, 3 milling trains, 4 pre-straightening machines, 5 enter water/leaving water temperature pyrometer,
6 inclination jet flow cooling systems, 7 water outlets/enter table pyrometer waterborne, 8 water outlets/enter under water table pyrometer, 9 return red temperature
Degree pyrometer.
Specific embodiment
Embodiment 1
A kind of special heavy plate acceleration cooling method based on inclination injection stream that the present embodiment provides, arrangement such as Fig. 1 institute of production line
Show, the a572gr50 billet size 320mm × 1880mm × 3977mm of the present embodiment, rolling special thickness size 102mm × 1912mm
×12353mm.The concrete process step of steel billet is as follows:
(1) the chemical component weight percentage ratio of a572gr50 steel plate is: c:0.16, si:0.199, mn:1.518, p:0.0122,
S:0.0016, v:0.0488, alt:0.032, remaining is fe and inevitable impurity.
(2) blank cold charge, 500-594 DEG C of the preheating zone furnace gas temperature of heating furnace 1, heats 1 area furnace gas temperature 979-1017
DEG C, heat 1022-1164 DEG C of 2 area's furnace gas temperature, heat 1200-1212 DEG C of 3 area's furnace gas temperature, soaking zone furnace gas temperature 1188-
1200 DEG C, preheating zone time 93min, heat 1 area time 43min, heat 2 area time 108min, heat 3 area time 168min,
Soaking zone time 122min, 1185 DEG C of mean temperature of coming out of the stove.
(3) blank, after heating furnace 1 goes out, through De-scaling box 2 de-scaling, enters milling train 3 and carries out two-phase control rolling, roll 9 roads altogether
Secondary.Workpiece thickness 160mm, 1005 DEG C of roughing start rolling temperature, 840 DEG C of finish rolling start rolling temperature, 822 DEG C of finishing temperature.Rolling knot
Shu Hou, special heavy plate enters pre-straightening machine 4 and aligns, and runs to tilting jet flow cooling system 6.
(4) the 6th, the 7th group of highly dense upper header flow is 200m3/ h, the 8th group of highly dense upper header flow is 260m3/ h, the
10th, the 11st group of highly dense upper header flow is 200m3/h.First time cooling water compares 1.3, and second, third time cooling water is than all
For 1.2, roller speed 0.5 m/s, 24.97 DEG C of water temperature, using three-stage cooling.
(5) pyrometer 5 detects into 810-820 DEG C of coolant-temperature gage, and special heavy plate is from tilting jet flow cooling system 6 entrance to going out
Mouth direction is run, and carries out cooling down for the first time.After special heavy plate afterbody leaves inclination jet flow cooling system 6, pyrometer 7 detects water outlet
Upper table temperature 624-647 DEG C, pyrometer 8 detects table temperature 590-607 DEG C under water.
(6) roller-way reversion, through 1.15s, roller table speed is changed into reverse -0.5m/s from positive 0.5m/s, and special heavy plate is reverse
Enter jet flow cooling system 6 and carry out second cooling.Pyrometer 7 detects into table temperature 676-695 DEG C waterborne, pyrometer
8 detect that, into table temperature 640-677 DEG C under water, temperature is returned on special heavy plate surface.After second cooling of special heavy plate terminates, pyrometer 5 detects
Special heavy plate water outlet upper table temperature 571-584 DEG C.
(7) after special heavy plate afterbody leaves inclination jet flow cooling system 6 entrance, roller-way inverts, through 1.15s, roller-way speed
Degree is changed into positive 0.5m/s from reverse -0.5m/s, and pyrometer 5 detection special heavy plate upper table returns temperature 628-643 DEG C, and special heavy plate enters
Enter jet flow cooling system 6 to carry out cooling down for the third time, reduce the thermograde on special heavy plate surface and center portion further.Special thick
After plate afterbody leaves inclination jet flow cooling system 6 outlet, pyrometer 7 detects table temperature 493-515 DEG C waterborne, pyrometer 8
Detect table temperature 474-495 DEG C under water, pyrometer 9 detects that its red temperature is 569-590 DEG C.
In addition to the implementation, the present invention can also have other embodiment.All employing equivalents or equivalent transformation shape
The technical scheme becoming, all falls within the protection domain of application claims.
Claims (4)
1. a kind of special heavy plate acceleration cooling method based on inclination injection stream, the method comprising the steps of: (i) tapping temperature
Blank for 1160-1200 DEG C, after De-scaling box de-scaling, enters milling train and carries out pair rolling or two-phase control rolling, rolling terminates
Afterwards, special heavy plate enters pre-straightening machine aligning；(ii), after special heavy plate pre-straightening, carry out accelerating cooling tilting jet flow cooling system；
It is characterized in that:
Described step (ii) in, the cooling manifold tilting jet flow cooling system is divided 14 groups and is controlled, the 4th group of 1- is seam
Gap spray header, including upper gap collector and lower gap collector, the 14th group of 5- is highly dense spray header, including highly dense upper header
With highly dense lower collector pipe；On the 4th group of 1-, gap collector is positive injection, the 5th group of highly dense upper header contra-injection, the 6th, the 7th,
9th, the 10th, the 12nd and the 13rd group of highly dense upper header is positive injection, and the 8th, the 11st and the 14th group of highly dense upper header is instead
To injection, all lower gap collectors and highly dense lower collector pipe are positive injection；Described forward direction is sprayed for cooling down current injection direction
Consistent with special heavy plate traffic direction, and an inclination angle is become with special heavy plate, described contra-injection is cooling current injection direction and spy
Slab traffic direction is contrary, and becomes an inclination angle with special heavy plate；
For individually unit and combine single using " positive injection+contra-injection " or " positive injection+positive injection+contra-injection "
The jet cooling of unit；In " positive injection+contra-injection " unit, reversely highly dense upper header flow=positive highly dense upper header flow,
In " positive injection+positive injection+contra-injection " unit, reversely highly dense upper header flow=positive highly dense upper header flow+(60-
100)m3/ h, wherein, the 4th group of gap nozzle collector of 1- and the 5th group of highly dense spray header are not opened；
Using three-stage cooling, when cooling down for the first time, between 0.5-0.8m/s, special heavy plate surface rate of cooling is in 5-7 for roller speed
DEG C/s, leaving water temperature controls at 600-650 DEG C；After special heavy plate afterbody leaves inclination jet flow cooling system outlet, using roller-way
Reversing time is realized special heavy plate surface and is returned temperature, and special heavy plate enters jet flow cooling system with the roller speed of 0.5-0.8m/s to be carried out
Cool down for second, between 3-5 DEG C/s, leaving water temperature controls at 550-600 DEG C special heavy plate surface rate of cooling；Special heavy plate afterbody
After leaving inclination jet flow cooling system entrance, realize special heavy plate surface using roller-way reversing time and return temperature, special heavy plate is with 0.5-
The roller speed of 0.8m/s enters jet flow cooling system and carries out cooling down for the third time, and special heavy plate surface rate of cooling is in 3-5 DEG C/s
Between, red temperature is between 450-600 DEG C.
2. as claimed in claim 1 based on the special heavy plate acceleration cooling method tilting injection stream it is characterised in that: the 1st group of collection
Tube hub linear distance milling train centrage 79000mm, the 14th group of collector distance between center line milling train centrage 97000mm, tilt injection
Heat inspection physical location 72880mm, the cold inspection physical location 101880mm of outlet of flow cooling system entrance, when tilting, injection stream is cold
But when the cold inspection first time of system outlet detects the arrival of special heavy plate afterbody, roller-way inverts, and special heavy plate runs to milling train direction, when
The heat inspection tilting jet flow cooling system entrance detects special heavy plate and its afterbody arrival physical location 75580mm for the second time
When, roller-way inverts, and special heavy plate runs to away from milling train direction.
3. as claimed in claim 1 based on the special heavy plate acceleration cooling method tilting injection stream it is characterised in that: described special thick
The thickness of plate is 80-250mm.
4. as claimed in claim 1 based on the special heavy plate acceleration cooling method tilting injection stream it is characterised in that: described three sections
In formula cooling, special heavy plate enters 770-1000 DEG C of coolant-temperature gage, and special heavy plate is transported to Way out from inclination jet flow cooling system entrance
OK, carry out cooling down for the first time, after special heavy plate afterbody leaves inclination jet flow cooling system, water outlet upper table temperature 600-650 DEG C, go out
Table temperature 570-610 DEG C under water；
Roller-way inverts, and roller table speed is changed into reverse from forward direction, and special heavy plate is redirected back into jet flow cooling system and carries out second
Secondary cooling, enters table temperature 650-720 DEG C waterborne, enters under water table temperature 620-690 DEG C, and temperature, special heavy plate second are returned in special heavy plate surface
After secondary cooling terminates, water outlet upper table temperature 550-600 DEG C；
After special heavy plate afterbody leaves inclination jet flow cooling system entrance, roller-way inverts, and roller table speed is from being reversely changed into positive, special
Slab upper table returns temperature 620-700 DEG C, and special heavy plate enters jet flow cooling system to carry out cooling down for the third time, subtracts further
Scantlings surface and the thermograde of center portion, after special heavy plate afterbody leaves inclination jet flow cooling system outlet, water outlet upper table
Temperature 400-530 DEG C, water outlet following table temperature 380-510 DEG C, special heavy plate red temperature is 450-600 DEG C.
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| CN201610785724.0A CN106363029B (en) | 2016-08-30 | 2016-08-30 | A kind of special heavy plate acceleration cooling method based on inclination injection stream |
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| CN201610785724.0A CN106363029B (en) | 2016-08-30 | 2016-08-30 | A kind of special heavy plate acceleration cooling method based on inclination injection stream |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109127739A (en) * | 2018-10-23 | 2019-01-04 | 中冶京诚工程技术有限公司 | Wire rod control cooling system rolled piece temperature detection processing method and processing device |
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| JP2000042621A (en) * | 1998-07-28 | 2000-02-15 | Nkk Corp | Cooling control method of hot rolled steel plate |
| CN101920271A (en) * | 2010-07-27 | 2010-12-22 | 福建三宝特钢有限公司 | Controlled rolling and controlled cooling production process of HRB400 (Hot-rolled Ribbed-steel Bar 400) steel bar |
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