CN106363029B - A kind of special heavy plate acceleration cooling method based on inclination injection stream - Google Patents
A kind of special heavy plate acceleration cooling method based on inclination injection stream Download PDFInfo
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- CN106363029B CN106363029B CN201610785724.0A CN201610785724A CN106363029B CN 106363029 B CN106363029 B CN 106363029B CN 201610785724 A CN201610785724 A CN 201610785724A CN 106363029 B CN106363029 B CN 106363029B
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- heavy plate
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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
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- 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
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Abstract
The invention discloses a kind of based on the special heavy plate acceleration cooling method for tilting injection stream, this method uses " positive injection+contra-injection " or " positive injection+forward direction injection+contra-injection " to accelerate cooling for individually unit and the jet stream cooled region three-stage of assembled unit, by the cooling rate control, the control of surface cooling temperature, the match settings for returning warm time control and corresponding water cooling parameter of different temperatures section, realize that special heavy plate accelerates cooling.The present invention will pass through special heavy plate different temperatures section, cooling rate and the overall-in-one control schema of phase-change organization, cooling path is organically combined with special heavy plate cooling, the temperature gradient on special heavy plate thickness direction is greatly reduced, the exploitation for diversified performance requirement special heavy plate new steel grade provides process window.
Description
Technical field
It is specifically a kind of based on inclination spray the present invention relates to a kind of acceleration of special heavy plate cooling or press quenching method
The special heavy plate acceleration cooling method of jet stream.
Background technology
With the wilderness demand of special heavy plate on the exploitation of special heavy plate new steel grade and steel market, special heavy plate cooling has become
Essential processing support and technical guarantee.It is special thick for the cooling special heavy plate of the lower acceleration of final cooling temperature and press quenching
Plate, traditional cooling facility for laminar flow are difficult to meet the intensity of cooling of special heavy plate and final cooling temperature demand, and ultra-fast cooling device is using normal
The cooling means of rule also encounters great difficulty.
Vapor cooling device, cooling facility for laminar flow and ultra-fast cooling device are relied on, have in part/Heavy Plate Rolling Line carries out
Accelerate the production of cooling special heavy plate.Chinese patent application (application No. is 201110358363.9) in 2011 discloses " a kind of
The production method of super-thick steel plate ", the invention are produced high-performance 60-100mm thickness Q345R steel plates using continuous casting billet, are opened after rolling cold
780-800 DEG C of temperature, cooling velocity are 3-6 DEG C/s, 680-730 DEG C of red temperature, but do not illustrate specific cooling means.
When plank thickness is more than a certain numerical value and need to use accelerated cooling process, in the limited cooling zone of steel rolling production-line
It carries out through formula or the continuous big flow cooling of swing type, than stronger, slab center portion is cold for the heat exchange of slab surface and cooling water
But ability is weaker, causes temperature gradient on thickness direction larger.It is carried out through formula or pendulum in the limited cooling zone of steel rolling production-line
The small flow cooling of dynamic formula, the red temperature of slab are high, 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 generates " sandwich " formula steel plate, i.e., 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 heat transfer of steel plate center portion and surface, mechanical property and
Plate shape is difficult to ensure.Roller speed is slow, and cooling residual water is long in slab superficial residence time, influences heat exchange efficiency and coldplate shape.Using
When swing type cooling accelerate cooling, after plank thickness is more than a certain value, due to thickness effect, cooling water and surface of steel plate
The heat transfer on cooling, steel plate center portion and surface differs greatly.
When being cooled down using above-mentioned vapor cooling device, cooling facility for laminar flow, it is difficult to realize that the acceleration of special heavy plate is cold
But.
Invention content
The technical problems to be solved by the invention：A kind of special heavy plate acceleration cooling method based on inclination injection stream is provided,
Jet flow cooling system (maximum flow of water amount 16000m is tilted using double frames on single chassis Heavy Plate Rolling Line3/ h) realize spy
The acceleration of slab cools down, and reduces the temperature gradient on surface and center portion when special heavy plate accelerates cooling；This method carries out three to special heavy plate
Segmentation cools down, and by the cooling rate control of different temperatures section, the control of surface cooling temperature, returns warm time control and corresponding water cooling parameter
Match settings, realize special heavy plate acceleration cooling.
The technical solution that the present invention solves the above technical problem is：
A kind of special heavy plate acceleration cooling method based on inclination injection stream, this approach includes the following steps：(i) tapping temperature
It is 1160-1200 DEG C of blank after De-scaling box de-scaling, carries out pair rolling into milling train or two-phase control rolling, rolling terminate
Afterwards, special heavy plate enters pre-straightening machine aligning；(ii) after special heavy plate pre-straightening, acceleration cooling is carried out tilting jet flow cooling system；
Step (ii) in, the cooling manifold for tilting jet flow cooling system division is controlled for 14 groups, the 4th group of 1- is gap nozzle collection
Pipe, including upper gap collector and lower gap collector, the 14th group of 5- are highly dense spray header, including highly dense upper header and it is highly dense under
Collector；Gap collector is positive injection on the 4th group of 1-, the 5th group of highly dense upper header contra-injection, and the 6th, the 7th, the 9th,
10, 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 contra-injection,
All lower gap collectors and highly dense lower collector pipe are positive injection；The positive injection is cooling flow injection direction and special heavy plate
Traffic direction is consistent, and with special heavy plate at an inclination angle, and the contra-injection is that cooling flow injection direction is run with special heavy plate
Direction is on the contrary, and with special heavy plate at an inclination angle；Using " positive injection+contra-injection " or " positive injection+forward direction injection+anti-
To injection " it is cooled down for the jet stream of individually unit or assembled unit；In " positive injection+contra-injection " unit, reversed highly dense upper collection
The highly dense upper header flow of pipe flow=forward direction, in " positive injection+forward direction injection+contra-injection " unit, reversed highly dense upper header stream
The highly dense upper header flow of amount=forward direction+(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；It is cooled down using three-stage, when cooling for the first time, roller speed is between 0.5-0.8m/s, special heavy plate surface cooling speed
Degree is controlled in 5-7 DEG C/s, leaving water temperature at 600-650 DEG C；After the outlet of inclination jet flow cooling system is left in special heavy plate tail portion, profit
Realize that temperature is returned on special heavy plate surface with roller-way reversing time, special heavy plate is entered with the roller speed of 0.5-0.8m/s tilts injection stream cooling system
System carries out second of cooling, and between 3-5 DEG C/s, leaving water temperature is controlled at 550-600 DEG C special heavy plate surface cooling velocity；It is special thick
After inclination jet flow cooling system entrance is left in plate tail portion, realize that temperature, special heavy plate are returned in special heavy plate surface using roller-way reversing time
Entered with the roller speed of 0.5-0.8m/s and tilt jet flow cooling system progress third time cooling, special heavy plate surface cooling velocity is in 3-
Between 5 DEG C/s, red temperature is between 450-600 DEG C.
The technical solution that the present invention further limits is：
Special heavy plate acceleration cooling method above-mentioned based on inclination injection stream, wherein the 1st group of collection tube hub line is apart from milling train
Center line 79000mm, the 14th group of collection tube hub line tilt jet flow cooling system entrance apart from milling train center line 97000mm
Heat inspection physical location 72880mm, the cold inspection physical location 101880mm of outlet, when the cold inspection for tilting jet flow cooling system outlet
When detecting that special heavy plate tail portion reaches for the first time, roller-way reversion, special heavy plate is run to milling train direction, when inclination injection stream cooling system
When the heat inspection of system entrance detects that special heavy plate and its tail portion reach physical location 75580mm for the second time, roller-way reversion, special heavy plate
It is run to far from milling train direction.
The thickness of special heavy plate acceleration cooling method above-mentioned based on inclination injection stream, special heavy plate is 80-250mm.
Special heavy plate acceleration cooling method above-mentioned based on inclination injection stream, in three-stage cooling, special heavy plate enters coolant-temperature gage
770-1000 DEG C, special heavy plate is run from jet flow cooling system entrance is tilted to export direction, carries out cooling for the first time, special heavy plate
After inclination jet flow cooling system is left in tail portion, 600-650 DEG C of water outlet upper table temperature, 570-610 DEG C of water outlet following table temperature；Roller-way
Reversion, roller table speed become reversed from forward direction, and special heavy plate, which is redirected back into, tilts second of cooling of jet flow cooling system progress, enters
650-720 DEG C of table temperature waterborne enters underwater 620-690 DEG C of table temperature, and temperature is returned on special heavy plate surface, and second of cooling of special heavy plate terminates
Afterwards, 550-600 DEG C of water outlet upper table temperature；After inclination jet flow cooling system entrance is left in special heavy plate tail portion, roller-way reversion, roller-way
For speed from reversely becoming positive, special heavy plate upper table returns 620-700 DEG C of temperature, special heavy plate enter tilt jet flow cooling system into
Row third time is cooling, further decreases the temperature gradient of special heavy plate surface and center portion, it is cold that inclination injection stream is left in special heavy plate tail portion
But after system outlet, 400-530 DEG C of water outlet upper table temperature, 380-510 DEG C of water outlet following table temperature, special heavy plate red temperature is 450-
600℃。
The beneficial effects of the invention are as follows：(1) three-stage accelerates the cooling generation for avoiding " sandwich " formula special heavy plate, significantly
The temperature gradient and the histological difference on thickness direction for reducing special heavy plate surface and center portion；(2) three-stage accelerates cooling utilize
Roller-way reversing time is realized while temperature is returned on special heavy plate surface, it can be achieved that returning the control of phase-change organization during temperature, favorably twice
In the special heavy plate for obtaining diversified performance requirement, the exploitation for special heavy plate new steel grade provides process window；(3) three-stage accelerates
Cooling special heavy plate, takes into account the heat exchange of cooling water and special heavy plate surface and the heat transfer on special heavy plate surface and center portion, improves cold
But efficiency；(4) three-stage cooling means, will be cold by special heavy plate different temperatures section, cooling rate and the overall-in-one control schema of phase-change organization
But path is organically combined with special heavy plate cooling, realizes that special heavy plate accelerates cooling.
Description of the drawings
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-tilt jet flow cooling system, and 7-are discharged/enter table pyrometer waterborne, and 8-are discharged/enter underwater table pyrometer, and 9-return red temperature
Spend pyrometer.
Specific implementation mode
Embodiment 1
Provided in this embodiment a kind of based on the special heavy plate acceleration cooling method for tilting injection stream, the arrangement of production line is as schemed
Shown in 1, the A572Gr50 billet sizes 320mm × 1880mm × 3977mm of the present embodiment, the special thick size 102mm of rolling ×
1912mm×12353mm.The specific processing step of steel billet is as follows：
(1) chemical component weight percentage of A572Gr50 steel plates 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 heat 1 area furnace gas temperature 979-1017
DEG C, 2 1022-1164 DEG C of area's furnace gas temperatures are heated, 3 1200-1212 DEG C of area's furnace gas temperatures, soaking zone furnace gas temperature 1188- are heated
1200 DEG C, preheating zone time 93min, 1 area time 43min is heated, heats 2 area time 108min, heats 3 area time 168min,
Soaking zone time 122min, 1185 DEG C of mean temperature of coming out of the stove.
(3) blank is after heating furnace 1 goes out, and through 2 de-scaling of De-scaling box, carries out two-phase control rolling into milling train 3, rolls 9 altogether
It is 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 the aligning of pre-straightening machine 4, and is run to jet flow cooling system 6 is tilted.
(4) the 6th, the 7th groups of highly dense upper header flows are 200m3/ h, the 8th group of highly dense upper header flow are 260m3/ h, the
10, the 11st group of highly dense upper header flow is 200m3/h.First time cooling water is than 1.3, and second, third time cooling water is than equal
It is 1.2, roller 0.5 m/s of speed, 24.97 DEG C of water temperature is cooled down using three-stage.
(5) pyrometer 5 is detected into 810-820 DEG C of coolant-temperature gage, and special heavy plate is from 6 entrance of jet flow cooling system is tilted to going out
The operation of mouth direction carries out cooling for the first time.After inclination jet flow cooling system 6 is left in special heavy plate tail portion, the detection water outlet of pyrometer 7
624-647 DEG C of upper table temperature, pyrometer 8 detect underwater 590-607 DEG C of table temperature.
(6) roller-way inverts, and by 1.15s, roller table speed becomes reversed -0.5m/s from positive 0.5m/s, and special heavy plate is reversed
Second of cooling is carried out into jet flow cooling system 6 is tilted.Pyrometer 7 is detected into 676-695 DEG C of table temperature waterborne, pyrometer
8 detect into underwater 640-677 DEG C of table temperature, and temperature is returned on special heavy plate surface.After second of cooling of special heavy plate, pyrometer 5 detects
Special heavy plate is discharged 571-584 DEG C of upper table temperature.
(7) after inclination 6 entrance of jet flow cooling system is left in special heavy plate tail portion, roller-way reversion, by 1.15s, roller-way speed
Degree becomes positive 0.5m/s from reversed -0.5m/s, and pyrometer 5 detects special heavy plate upper table and returns 628-643 DEG C of temperature, special heavy plate into
Enter to tilt jet flow cooling system 6 and carry out third time cooling, further decreases the temperature gradient of special heavy plate surface and center portion.It is special thick
After the outlet of inclination jet flow cooling system 6 is left in plate tail portion, pyrometer 7 detects 493-515 DEG C of table temperature waterborne, pyrometer 8
Detect underwater 474-495 DEG C of table temperature, it is 569-590 DEG C that pyrometer 9, which detects its red temperature,.
In addition to the implementation, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (2)
1. a kind of based on the special heavy plate acceleration cooling method for tilting injection stream, the thickness of the special heavy plate is 80-250mm；It is described
Method includes the following steps：(i) the blank that tapping temperature is 1160-1200 DEG C carries out conventional after De-scaling box de-scaling into milling train
Rolling or two-phase control rolling, after rolling, special heavy plate enters pre-straightening machine aligning；(ii) it after special heavy plate pre-straightening, is sprayed tilting
Jet stream cooling system carries out acceleration cooling；It is characterized in that：
The step (ii) in, the cooling manifold for tilting jet flow cooling system division is controlled for 14 groups, the 4th group of 1- is seam
Gap spray header, including upper gap collector and lower gap collector, the 14th group of 5- are highly dense spray header, including highly dense upper header
With highly dense lower collector pipe；Gap collector is positive injection on the 4th group of 1-, 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 anti-
To injection, all lower gap collectors and highly dense lower collector pipe are positive injection；The positive injection is cooling flow injection direction
It is consistent with special heavy plate traffic direction, and with special heavy plate at an inclination angle, the contra-injection is cooling flow injection direction and spy
Slab traffic direction is on the contrary, and with special heavy plate at an inclination angle；
Use " positive injection+contra-injection " or " positive injection+forward direction injection+contra-injection " for individually unit or assembled unit
Jet stream cooling；In " positive injection+contra-injection " unit, the reversed highly dense highly dense upper header flow of upper header flow=forward direction,
In " positive injection+forward direction injection+contra-injection " unit, the reversed highly dense highly dense upper header flow+(60- of upper header flow=forward direction
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；
It is cooled down using three-stage, when cooling for the first time, roller speed is between 0.5-0.8m/s, and special heavy plate surface cooling velocity is in 5-7
DEG C/s, leaving water temperature control is at 600-650 DEG C；After the outlet of inclination jet flow cooling system is left in special heavy plate tail portion, roller-way is utilized
Reversing time realizes that temperature is returned on special heavy plate surface, and special heavy plate is entered with the roller speed of 0.5-0.8m/s tilts jet flow cooling system progress
Second cooling, and between 3-5 DEG C/s, leaving water temperature is controlled at 550-600 DEG C special heavy plate surface cooling velocity；Special heavy plate tail portion
It leaves after tilting jet flow cooling system entrance, realizes that temperature is returned on special heavy plate surface using roller-way reversing time, special heavy plate is with 0.5-
The roller speed of 0.8m/s, which enters, tilts jet flow cooling system progress third time cooling, and special heavy plate surface cooling velocity is in 3-5 DEG C/s
Between, red temperature is between 450-600 DEG C；
In three-stage cooling, special heavy plate enters 770-1000 DEG C of coolant-temperature gage, and special heavy plate is from tilting jet flow cooling system entrance
It is run to export direction, carries out cooling for the first time and be discharged upper table temperature after inclination jet flow cooling system is left in special heavy plate tail portion
600-650℃；
Roller-way inverts, and roller table speed becomes reversed from forward direction, and special heavy plate, which is redirected back into, tilts jet flow cooling system progress second
Secondary cooling enters 650-720 DEG C of table temperature waterborne, enters underwater 620-690 DEG C of table temperature, and temperature, special heavy plate second are returned in special heavy plate surface
After secondary cooling, 550-600 DEG C of water outlet upper table temperature；
After inclination jet flow cooling system entrance is left in special heavy plate tail portion, roller-way reversion, roller table speed is from reversely becoming positive, spy
Slab upper table returns 620-700 DEG C of temperature, and special heavy plate, which enters, tilts jet flow cooling system progress third time cooling, further subtracts
The temperature gradient on scantlings surface and center portion is discharged upper table after the outlet of inclination jet flow cooling system is left in special heavy plate tail portion
400-530 DEG C of temperature, 380-510 DEG C of water outlet following table temperature, special heavy plate red temperature are 450-600 DEG C.
2. as described in claim 1 based on the special heavy plate acceleration cooling method for tilting injection stream, it is characterised in that：1st group of collection
Tube hub line tilts injection apart from milling train center line 79000mm, the 14th group of collection tube hub line apart from milling train center line 97000mm
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 of system outlet detects that special heavy plate tail portion reaches for the first time, roller-way reversion, special heavy plate is run to milling train direction, when
The heat inspection for tilting jet flow cooling system entrance detects special heavy plate for the second time and its tail portion reaches physical location 75580mm
When, roller-way reversion, special heavy plate is run to far from milling train direction.
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| JP3656707B2 (en) * | 1998-07-28 | 2005-06-08 | Ｊｆｅスチール株式会社 | Controlled cooling method for hot rolled steel sheet |
| CN101920271B (en) * | 2010-07-27 | 2012-02-15 | 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 |
| CN202238948U (en) * | 2011-07-19 | 2012-05-30 | 东北大学 | After-rolling ultrafast cooling and laminar cooling device based on ultrafast cooling technology |
| CN102601134B (en) * | 2011-12-09 | 2013-08-14 | 秦皇岛首秦金属材料有限公司 | Method for controlling thin pipeline steel cooling uniformity in ultrafast cooling process |
| KR101190609B1 (en) * | 2012-02-06 | 2012-10-15 | 한국기계연구원 | Cooling system for thick plate or steel plate |
| CN103555914B (en) * | 2013-11-25 | 2015-07-22 | 南京钢铁股份有限公司 | On-line quenching and plate shape controlling technology for 12MnNiVR steel plate |
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