CN105478704B - Prevent the system and its application method of micro alloyed steel strand continuous casting chink defect - Google Patents

Prevent the system and its application method of micro alloyed steel strand continuous casting chink defect Download PDF

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CN105478704B
CN105478704B CN201610000423.2A CN201610000423A CN105478704B CN 105478704 B CN105478704 B CN 105478704B CN 201610000423 A CN201610000423 A CN 201610000423A CN 105478704 B CN105478704 B CN 105478704B
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cooling water
secondary cooling
cavity
water flow
resorption
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CN105478704A (en
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贾国生
成旭东
范佳
周素强
孙玉虎
郭辉
马静超
李建文
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Hebei Iron And Steel Co Ltd Handan Branch
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Hebei Iron And Steel Co Ltd Handan Branch
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16Controlling or regulating processes or operations
    • B22D11/22Controlling or regulating processes or operations for cooling cast stock or mould
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/124Accessories for subsequent treating or working cast stock in situ for cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/124Accessories for subsequent treating or working cast stock in situ for cooling
    • B22D11/1246Nozzles; Spray heads

Abstract

The present invention prevents the system and its application method of micro alloyed steel strand continuous casting chink defect,On the basis of being improved to the structure of existing two cold water sprays cooling device,Establish secondary cooling water spraying rack lowering or hoisting gear,Secondary cooling water flow regulator and Process Control System,Realize secondary cooling water film-cooled heat dynamic control and secondary cooling water flow with the change of cooling zone area adjust automatically,Avoid the change that strand inner arc corner causes transversal crack occur and cause strand inner arcuate surface temperature because of the change of intensity of cooling because directly being sprayed by secondary cooling water,It ensure that the intensity of cooling of strand inner arcuate surface does not change,Solves the micro alloyed steel strand transverse corner crack defect problem appeared in long-standing problem continuous casting production process,Vital effect is played to improving micro alloyed steel slab quality,With significant economic benefit,In industry there is great popularizing value.

Description

Prevent the system and its application method of micro alloyed steel strand continuous casting chink defect
Technical field
Present invention offer is a kind of to prevent transverse corner crack defect in micro alloyed steel strand continuous casting production process The application method of system and the system, belong to continuous casting installation for casting technical field.
Background technology
Micro alloyed steel refers to the addition of micro conjunction in common mild steel and rolled products of ordinary high-strength low alloy steel substrate chemical composition The steel of gold element, generally, the addition of alloying element are not more than 0.20%, after adding trace alloying element, can make the mechanics of steel Performance indications be improved significantly, but simultaneously the occurrence probability of all kinds of defects of micro alloyed steel casting billet surface also be significantly larger than other steel The strand of kind, just include transverse corner crack among these;Transverse corner crack defect can roll edges of boards after rolling process Portion develops into the edge fault on similar rotten side, so as to have a strong impact on the final mass of plate product.Micro alloyed steel strand corner is horizontal In generation and production process to crackle in casting blank surface temperature and steel the carbide of microalloy element, carbonitride in the temperature Precipitation under section is closely related, and generally, between setting temperature ~ 600 DEG C, steel has three brittle temperature zones, i.e.,:Solidification temperature IIIth fragility temperature of the Ith brittle temperature zone near degree, the IIth brittle temperature zone near 1200 DEG C and 950 DEG C ~ 700 DEG C sections Area is spent, in these temperature ranges, the toughness that steel is shown is poor, and in the presence of extraneous larger pulling force, the matrix of steel is just Generation fracture is easy to crack;Research shows that the IIIth brittle temperature zone and casting billet surface transversal crack relation of steel are particularly Closely;Because:After strand enters the aligning region of conticaster, the straightening force that is applied by fan-shaped section smoothing roll to strand Influence, the inner arc position of strand can bear larger action of pulling stress, cause the surface metal generation of its inner arc position larger Plastic deformation, will be along metallic grain boundaries when the stress that surface metal is born exceedes the plastic stress limit that it can bear It is broken;In addition, the microalloy element such as Nb, V, Ti, Al in micro alloyed steel and C in steel, nitride, the carbon of N element generation Nitride can be separated out in the IIIth brittle temperature zone in the form of the minuteness particle of nano-grade size, and these particles can be attached to crystalline substance At boundary, and crystal boundary is damaged, will be more significant so as to prolong the influence of plasticity energy to steel;For these reasons, continuous casting scene There are strict requirements to the temperature range of micro alloyed steel casting billet surface, it is desirable to which surface temperature of the strand in continuous casting aligning area will More than 900 DEG C, but allow also for when casting blank surface temperature is higher than 950 DEG C, austenite crystal can be caused thick strand The defects of, the problem of so as to cause the mechanical property of final plate product undesirable, most strand aligns area in continuous casting at last Interior surface temperature control is in the range of 900 DEG C ~ 950 DEG C.
Production scene control strand is by being fixed on the upper and lower framework of fan-shaped section in the main path that secondary cooling zone cools The spray gun of upper spraying rack is simultaneously to two wide faces up and down of strand, i.e. intrados and extrados sprinkling cooling water, so as to realize casting The cooling of base;In temperature-fall period, the cooling rate of the diverse location of casting billet surface is different, and this is mainly reflected in strand Corner positions and common wide face position;Generally, it is considered that influenceed by casting blank cross-section size, the radiating mode in the generally wide face of strand For one-dimensional radiating, normal direction of the heat along strand inner arcuate surface outwardly spreads, therefore the cooling rate in the region is relatively low, and The radiating mode of strand corner positions radiates for two dimension, and heat outwardly expands simultaneously along the wide face adjacent with strand corner and leptoprosopy Dissipate, therefore the cooling rate in the region is significantly larger than the cooling rate of the usual inner arcuate surface of strand, so as to cause to align in continuous casting Strand corner temperature in area is easier to be less than 900 DEG C, causes the generation of a large amount of strand transverse corner cracks;In addition, spraying During cooling water, influenceed by Action of Gravity Field, the cooling water intensity of spray irrigation that strand extrados is born will be weaker than intrados The cooling water intensity of spray irrigation born, this results in strand transverse corner crack defect and is concentrated mainly on inner arc position, therefore solves Certainly the emphasis of micro alloyed steel strand transverse corner crack defect is the generation for the transverse corner crack defect for effectively avoiding its inner arc.
The method of solution micro alloyed steel strand transverse corner crack defect mainly has following several in the prior art:
(1), by smelting the link method that effectively controls N content in steel, so as to control the nitrogen of microalloy element in steel Compound, the amount of precipitation of carbonitride, solve the problems, such as the defects of transverse corner crack of strand;This method is although hair can be reduced The probability of raw strand transverse corner crack defect, but simultaneously can be along with generation problems with:
1., the complexity of smelting process can be increased, and then increase steel making working procedure cost;
2., micro alloyed steel product be mainly the " nail for relying on the nitride of microalloy element in steel, Carbonitride Precipitation particle Prick " effect, to control the crystallite dimension in steel, the lifting of product mechanical property is realized, therefore N content too low in steel can influence To the mechanical property of final products.
(2), by under normal temperature strand carry out " corner cut " handle, i.e., strand inner arc corner is integrally cut along throwing direction Remove, so as to solve the problems, such as the defects of strand transverse corner crack;This method can be avoided strand transverse corner crack effectively Defect is brought into steel rolling process link, so that it is guaranteed that final products are not in " rotten side " defect, wins the satisfaction of user, but lack Point is that productive labor intensity is big, while can cause substantial amounts of metal waste, influences production cost.
(3), align fan-shaped section near area by manually blocking continuous casting and be located at spray gun spray nozzle above strand inner arc corner Method, cooling water is avoided to be directly injected to strand inner arc corner, so as to reduce the intensity of cooling in strand inner arc corner, it is ensured that the position Temperature is put in the range of 900 DEG C ~ 950 DEG C;Although this method can reduce the occurrence probability of strand transverse corner crack, lifting The qualification rate of cc billet surface quality, but be also fairly obvious the shortcomings that this method:
1., on the premise of identical continuous casting process condition, due to the difference of steel grade chemical analysis, cause strand corner Temperature change larger difference be present, production scene is needed for different steel grades in advance to the shower nozzle of fan-shaped section diverse location Do plugging handling;Therefore, this method is poor to the adaptability of steel grade;
2., implement this method equally exist the problem of productive labor intensity is big, be unfavorable for promoting on a large scale.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of system for preventing micro alloyed steel strand continuous casting chink defect And its application method, it is real by increasing secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator and Process Control System On the basis of not changing the cooling water inflow in lance ejection angle and casting billet surface central area unit area now, strand angle is avoided Near zone cooled Water spray in portion's is arrived, it is ensured that the strand inner arc corner temperature stabilization in aligning region is controlled 900 DEG C ~ 950 In the range of DEG C, the generation of strand inner arc transverse corner crack defect is effectively avoided.
Solve above-mentioned technical problem technical scheme be:
The system for preventing micro alloyed steel strand continuous casting chink defect, including secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water stream Quantity regulating device and Process Control System, the secondary cooling water spraying rack lowering or hoisting gear is by pneumatic cylinder 1, piston 2 and the structure of piston rod 3 Into the upper end of piston rod 3 is connected with piston 2, and piston 2 is assemblied in pneumatic cylinder 1 is divided into epicoele and cavity of resorption, epicoele side wall by pneumatic cylinder It is connected respectively with epicoele air inlet pipe 4 and epicoele escape pipe 5, epicoele solenoid valve 6, epicoele outlet is installed in epicoele air inlet pipe 4 Epicoele electromagnetic switch valve 7 is installed on pipe 5;Cavity of resorption side wall is connected with cavity of resorption air inlet pipe 8 and cavity of resorption escape pipe 9 respectively, cavity of resorption air inlet Cavity of resorption solenoid valve 10 is installed on pipe 8, cavity of resorption electromagnetic switch valve 11 is installed on cavity of resorption escape pipe 9;Epicoele is provided with epicoele pressure Force snesor 12 and displacement transducer 13, cavity of resorption are provided with cavity of resorption pressure sensor 14;The secondary cooling water flow regulator by Secondary cooling water flow electromagnetic regulating valve 15 and secondary cooling water flow sensor 16 on fan-shaped section secondary cooling water main line are formed;Institute State Process Control System and the epicoele solenoid valve for carrying out data communication is connected by computer 17 and respectively with computer 17 PLC18, cavity of resorption solenoid valve PLC19, epicoele electromagnetic switch valve PLC20, cavity of resorption electromagnetic switch valve PLC21, pneumatic cylinder information Feed back PLC22, secondary cooling water flow electromagnetic regulating valve PLC23, secondary cooling water flow feedback PLC24 compositions;Epicoele solenoid valve PLC18 is connected with epicoele solenoid valve 6, and cavity of resorption solenoid valve PLC19 is connected with cavity of resorption solenoid valve 10;Epicoele Electromagnetic switch valve PLC20 is connected with epicoele electromagnetic switch valve 7, cavity of resorption electromagnetic switch valve PLC21 and the phase of cavity of resorption electromagnetic switch valve 11 Connection;Pneumatic cylinder feedback of the information PLC22 simultaneously with upper cavity pressure sensor 12, cavity of resorption pressure sensor 14 and displacement transducer 13 It is connected, secondary cooling water flow electromagnetic regulating valve PLC23 is connected with secondary cooling water flow electromagnetic regulating valve 15, secondary cooling water flow feedback PLC24 is connected with secondary cooling water flow sensor 16;The secondary cooling water spraying rack lowering or hoisting gear is 4 sets, the lower end of its piston rod 3 Respectively with the upper surface for 4 underframe supports 25 for being installed on import and export position both sides of the fan-shaped section underframe along throwing direction It is fixedly connected;Pneumatic cylinder 1 side wall of the secondary cooling water spraying rack 26 respectively with 4 sets of secondary cooling water spraying rack lowering or hoisting gears is fixedly connected.
The above-mentioned system for preventing micro alloyed steel strand continuous casting chink defect, the gas of the secondary cooling water spraying rack lowering or hoisting gear Epicoele overflow valve 27 and cavity of resorption overflow valve 28 are also equipped with the epicoele of cylinder pressure 1 and cavity of resorption;Epicoele escape pipe 5 and cavity of resorption escape pipe 9 Remote one end being connected with pneumatic cylinder 1 is provided with screen pack 29.
The application method of the above-mentioned system for preventing micro alloyed steel strand continuous casting chink defect, comprises the following steps:
Step 1:Manual-lock epicoele solenoid valve, cavity of resorption solenoid valve, epicoele electromagnetic switch valve, cavity of resorption electromagnetism are opened Close valve and secondary cooling water flow electromagnetic regulating valve;
Step 2:The mode of operation of computer is adjusted to " open and pour preceding control " pattern, then, computer is grasped according to scene The instruction of work person, secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator are controlled respectively, concrete operation step For:
(1), control computer send command signal to epicoele solenoid valve PLC, open epicoele solenoid valve, now Pressure-air enters pneumatic cylinder epicoele in the presence of ambient pressure;Meanwhile send instruction letter to cavity of resorption electromagnetic switch valve PLC Number, open cavity of resorption electromagnetic switch valve, pneumatic cylinder moves up under the pressure of pressure-air, drive secondary cooling water spraying rack together by It is lifted to peak;After displacement transducer feeds back highest dot position information, control computer by epicoele solenoid valve and Cavity of resorption electromagnetic switch valve is closed, and it is motionless to realize that secondary cooling water spraying rack is stood with pneumatic cylinder in highest order;
(2), control computer command signal is sent to secondary cooling water flow electromagnetic regulating valve PLC, by the PLC control secondary cooling water Flow electromagnetic regulating valve is opened, and now high pressure secondary cooling water sprays from each spray gun on spraying rack, and secondary cooling water flow passes Sensor can feed back secondary cooling water house steward's data on flows to computer in real time by secondary cooling water flow feedback PLC, according to the data, pass through Computer sends command signal to secondary cooling water flow electromagnetic regulating valve PLC in real time, and adjustment secondary cooling water flow electromagnetic regulating valve is opened Degree, makes secondary cooling water flow meet production technology sets requirement;
(3), after the feedback result of secondary cooling water flow sensor matches with the cooling water flow of manufacturing technique requirent, control Computer processed sends command signal to secondary cooling water flow electromagnetic regulating valve PLC, secondary cooling water flow electromagnetic regulating valve is closed, then According to step(2)In spraying effect, the angle of inclination of each spray gun on manual fine-tuning secondary cooling water spraying rack, it is ensured that spraying rack The cooling water that upper each row's spray gun is sprayed can completely, be uniformly sprayed onto on the whole inner arc of strand, realize strand inner arc The uniform cooling on surface;
Step 3:The spray angle and strand width parameter of secondary cooling water spray gun are inputted into computer, current time two is cold Water spray rack position is defined as dead-center position;
Step 4:After formally pouring steel, the mode of operation of computer is adjusted to " open and controlled after pouring " pattern, manually to calculating The peak width of strand inner arc edge not cooled water injection along inner arc central axis direction is inputted in machine, computer meeting According to its plug-in, the distance that corresponding pneumatic cylinder moves down is calculated first, i.e.,:
In formula:For for the steel grade, the strand inner arc edge of staff's setting along inner arc central axis direction not The peak width of cooled water injection, unit:m;
The distance for needing to move down for pneumatic cylinder, unit:m;
For the spray angle of secondary cooling water spray gun;
After the completion of calculating, computer can send instruction to cavity of resorption solenoid valve PLC, and control cavity of resorption solenoid valve is beaten Open, now pressure-air enters pneumatic cylinder cavity of resorption in the presence of ambient pressure, and at the same time, computer is to epicoele electromagnetic switch Valve PLC sends command signal, and epicoele electromagnetic switch valve is opened, and now, pneumatic cylinder will move down, and then computer is with 10ms The numerical value that ~ 20ms is fed back by cycle monitoring displacement transducer, when the numerical value is equal toWhen, then computer can be simultaneously downward Chamber solenoid valve PLC and epicoele electromagnetic switch valve PLC send instruction, and cavity of resorption solenoid valve and epicoele electromagnetic switch valve are closed Close, it is ensured that pneumatic cylinder is in the position transfixion;
Step 5:After the operation of step 4 is completed, computer is ensureing strand inner arcuate surface unit by its plug-in On the premise of cooling water inflow on area is constant, the adjustment amount of secondary cooling water flow after pneumatic cylinder change in location is calculated, i.e.,:
In formula:Preceding set secondary cooling water flow, unit are poured to open:m3/h;
For the secondary cooling water flow after spraying rack position adjustment, unit:m3/h;
For the width of strand, unit:m;
Then, computer sends instruction to secondary cooling water flow electromagnetic regulating valve PLC, by secondary cooling water flow electromagnetic regulating valve Aperture is turned down, while monitors the numerical value that secondary cooling water flow sensor is fed back in real time using 10ms ~ 20ms by the cycle, when the number Value is equal toWhen, computer then sends instruction to secondary cooling water flow electromagnetic regulating valve PLC, by secondary cooling water flow electromagnetic regulating valve Aperture is fixed, it is ensured that secondary cooling water flow no longer changes;
Step 6:After completing to pour steel production, perform step 1 again by staff and operate, and according to the production schedule, it is accurate The standby step 2 that carries out operates.
The application method of the above-mentioned system for preventing micro alloyed steel strand continuous casting chink defect, along strand in the step 4 Vertical range of the inner arc edge to inner arc center lineIt is that the Simulation on Temperature Field experiment for being directed to different microalloy steel grades is drawn; The spray angle scope of secondary cooling water spray gun is 110 ° ~ 120 ° in the step 4.
The beneficial effects of the invention are as follows:
The present invention establishes secondary cooling water spray on the basis of being improved to the structure of existing two cold water sprays cooling device Frame lowering or hoisting gear, secondary cooling water flow regulator and Process Control System, realize secondary cooling water film-cooled heat dynamic control and Secondary cooling water flow adjust automatically with the change of cooling zone area, avoid strand inner arc corner because directly being sprayed by secondary cooling water and Cause the change for transversal crack occur and causing strand inner arcuate surface temperature because of the change of intensity of cooling, it is ensured that strand inner arc The intensity of cooling on surface does not change, and solves the micro alloyed steel strand corner appeared in long-standing problem continuous casting production process Transversal crack defect problem, vital effect is played to improving micro alloyed steel slab quality, there is significant economic benefit, In industry there is great popularizing value.
Brief description of the drawings
Fig. 1 is secondary cooling water spraying rack lifting device structure figure;
Fig. 2 is secondary cooling water spraying rack lowering or hoisting gear and secondary cooling water flow regulator connection structure diagram;
Fig. 3 is Process Control System schematic diagram;
In figure mark for:Pneumatic cylinder 1, piston 2, piston rod 3, epicoele air inlet pipe 4, epicoele escape pipe 5, the regulation of epicoele electromagnetism Valve 6, epicoele electromagnetic switch valve 7, cavity of resorption air inlet pipe 8, cavity of resorption escape pipe 9, cavity of resorption solenoid valve 10, cavity of resorption electromagnetic switch valve 11st, upper cavity pressure sensor 12, displacement transducer 13, cavity of resorption pressure sensor 14, secondary cooling water flow electromagnetic regulating valve 15, two are cold Water flow sensor 16, computer 17, epicoele solenoid valve PLC18, cavity of resorption solenoid valve PLC19, epicoele electromagnetic switch Valve PLC20, cavity of resorption electromagnetic switch valve PLC21, pneumatic cylinder feedback of the information PLC22, secondary cooling water flow electromagnetic regulating valve PLC23, two Cold water flow feedback PLC24, underframe support 25, secondary cooling water spraying rack 26, epicoele overflow valve 27, cavity of resorption overflow valve 28, filtering Net 29, spray gun 30, strand 31.
Embodiment
The present invention prevents the system of micro alloyed steel strand continuous casting chink defect from including secondary cooling water spraying rack lowering or hoisting gear, two cold Water flow regulating device and Process Control System, as shown in figure 1, secondary cooling water spraying rack lowering or hoisting gear is by pneumatic cylinder 1, the and of piston 2 Piston rod 3 is formed, and the upper end of piston rod 3 is connected with piston 2, and piston 2 is assemblied in pneumatic cylinder 1 is divided into epicoele with by pneumatic cylinder Chamber, epicoele side wall are connected with epicoele air inlet pipe 4 and epicoele escape pipe 5 respectively, and epicoele solenoid valve is installed in epicoele air inlet pipe 4 6, epicoele electromagnetic switch valve 7 is installed on epicoele escape pipe 5;Cavity of resorption side wall connects with cavity of resorption air inlet pipe 8 and cavity of resorption escape pipe 9 respectively Connect, cavity of resorption solenoid valve 10 is installed in cavity of resorption air inlet pipe 8, cavity of resorption electromagnetic switch valve 11 is installed on cavity of resorption escape pipe 9;Epicoele is pacified Equipped with upper cavity pressure sensor 12 and displacement transducer 13, displacement transducer 13 is used to detect the phase between pneumatic cylinder 1 and piston 2 To position;Cavity of resorption is provided with cavity of resorption pressure sensor 14;Epicoele overflow valve 27 is also equipped with the epicoele of pneumatic cylinder 1 and cavity of resorption with Chamber overflow valve 28, for protecting pneumatic cylinder 1 to be in the range of safe-working pressure;Epicoele escape pipe 5 and cavity of resorption escape pipe 9 are remote The one end being connected with pneumatic cylinder 1 is separately installed with screen pack 29, prevents the impurity in air from entering in pneumatic cylinder 1.
Fig. 2 shows that secondary cooling water spraying rack lowering or hoisting gear is 4 sets, import and export position both sides of the fan-shaped section along throwing direction Be fixed with 4 underframes the lower end of the piston rod 3 of 4 underframe supports, 25,4 sets of secondary cooling water spraying rack lowering or hoisting gears respectively with The upper surface of 4 underframe supports 25 is fixed;Secondary cooling water spraying rack 26 is fixedly connected at 4 sets of secondary cooling water spraying rack lowering or hoisting gears Pneumatic cylinder 1 side wall, on secondary cooling water spraying rack 26 installation it is cold by some spray guns 30, on the water inlet manifold of spray gun 30 to be provided with two Water-carrying capacity solenoid valve 15 and secondary cooling water flow sensor 16, the water in spray gun 30 are injected into the inner arcuate surface of strand 31.
Fig. 3 shows that Process Control System is connected by computer 17 and respectively with computer 17 carries out the upper of data communication Chamber solenoid valve PLC18, cavity of resorption solenoid valve PLC19, epicoele electromagnetic switch valve PLC20, cavity of resorption electromagnetic switch valve PLC21, pneumatic cylinder feedback of the information PLC22, secondary cooling water flow electromagnetic regulating valve PLC23, secondary cooling water flow feedback PLC24 compositions; Epicoele solenoid valve PLC18 is connected with epicoele solenoid valve 6, and cavity of resorption solenoid valve PLC19 is adjusted with cavity of resorption electromagnetism Valve 10 is connected;Epicoele electromagnetic switch valve PLC20 is connected with epicoele electromagnetic switch valve 7, cavity of resorption electromagnetic switch valve PLC21 and cavity of resorption Electromagnetic switch valve 11 is connected;Pneumatic cylinder feedback of the information PLC22 simultaneously with upper cavity pressure sensor 12, cavity of resorption pressure sensor 14 It is connected with displacement transducer 13, secondary cooling water flow electromagnetic regulating valve PLC23 is connected with secondary cooling water flow electromagnetic regulating valve 15, Secondary cooling water flow feedback PLC24 is connected with secondary cooling water flow sensor 16.
The present invention prevents the application method of the system of micro alloyed steel strand continuous casting chink defect, comprises the steps of:
Step 1:Manual-lock epicoele solenoid valve 6, cavity of resorption solenoid valve 10, epicoele electromagnetic switch valve 7, cavity of resorption electricity Magnetic switch valve 11 and secondary cooling water flow electromagnetic regulating valve 15;
Step 2:The mode of operation of computer 17 is adjusted to " open and pour preceding control " pattern, then, computer 17 is according to existing The instruction of field operator, is controlled, concrete operations to secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator respectively Step is:
(1), control computer 17 send command signal to epicoele solenoid valve PLC18, open epicoele solenoid valve 6, now pressure-air in the presence of ambient pressure enter pneumatic cylinder 1 epicoele;Meanwhile to cavity of resorption electromagnetic switch valve PLC21 Command signal is sent, opens cavity of resorption electromagnetic switch valve 11, pneumatic cylinder 1 moves up under the pressure of pressure-air, and drive two is cold Water spray frame is lifted to peak together;After displacement transducer 13 feeds back highest dot position information, control computer 17 Epicoele solenoid valve 6 and cavity of resorption electromagnetic switch valve 11 are closed, realize that secondary cooling water spraying rack is stood with pneumatic cylinder 1 in highest order It is motionless;
(2), control computer 17 command signal is sent to secondary cooling water flow electromagnetic regulating valve PLC23, by the PLC control two Cold water flow solenoid valve 15 is opened, and now high pressure secondary cooling water sprays from each spray gun 30 on spraying rack, and two is cold Water flow sensor 16 can feed back secondary cooling water house steward's data on flows to computer 17 in real time by secondary cooling water flow feedback PLC24, According to the data, command signal is sent to secondary cooling water flow electromagnetic regulating valve PLC23 in real time by computer 17, adjusts secondary cooling water The aperture of flow electromagnetic regulating valve 15, secondary cooling water flow is set to meet production technology sets requirement;
(3), after the feedback result of secondary cooling water flow sensor 16 matches with the cooling water flow of manufacturing technique requirent, Control computer 17 sends command signal to secondary cooling water flow electromagnetic regulating valve PLC23, by secondary cooling water flow electromagnetic regulating valve 15 Close, then according to step(2)In spraying effect, the inclination angle of each spray gun 30 on manual fine-tuning secondary cooling water spraying rack Degree, it is ensured that the cooling water that each row's spray gun 30 is sprayed on spraying rack can completely, uniformly be sprayed onto the whole interior of strand 31 On arc, the uniform cooling of the inner arcuate surface of strand 31 is realized;
Step 3:The spray angle of secondary cooling water spray gun 30 and the width parameter of strand 31 are inputted into computer 17, will be current Moment secondary cooling water spray rack position is defined as dead-center position;
Step 4:After formally pouring steel, the mode of operation of computer 17 is adjusted to " open and controlled after pouring " pattern, manually to meter The peak width of the inner arc edge of strand 31 not cooled water injection along inner arc central axis direction is inputted in calculation machine 17It is Simulation on Temperature Field experiment for different microalloy steel grades is drawn), inner arc edge is to the width regions of inner arc center line The region that water sprays that is not cooled is needed, computer 17 can calculate corresponding air pressure first according to its plug-in The distance that cylinder 1 moves down, i.e.,:
In formula:For for the steel grade, the strand inner arc edge of staff's setting along inner arc central axis direction not The peak width of cooled water injection, unit:m;
The distance for needing to move down for pneumatic cylinder 1, unit:m;
For the spray angle of secondary cooling water spray gun 30, scope is 110 ° ~ 120 °;
After the completion of calculating, computer 17 can send instruction to cavity of resorption solenoid valve PLC19, control cavity of resorption solenoid valve 10 open, and now pressure-air enters the cavity of resorption of pneumatic cylinder 1 in the presence of ambient pressure, and at the same time, computer 17 is upward Chamber electromagnetic switch valve PLC20 sends command signal, and epicoele electromagnetic switch valve 7 is opened, and now, pneumatic cylinder 1 will move down, so The numerical value that computer 17 is fed back using 10ms ~ 20ms by cycle monitoring displacement transducer 13 afterwards, when the numerical value is equal toWhen, Then computer 17 can send instruction to cavity of resorption solenoid valve PLC19 and epicoele electromagnetic switch valve PLC20 simultaneously, by cavity of resorption electromagnetism Regulating valve 10 and epicoele electromagnetic switch valve 7 are closed, it is ensured that pneumatic cylinder 1 is in the position transfixion;
Step 5:After the operation of step 4 is completed, computer 17 is ensureing the inner arcuate surface of strand 31 by its plug-in On the premise of cooling water inflow in unit area is constant, the adjustment amount of secondary cooling water flow after the change in location of pneumatic cylinder 1 is calculated, I.e.:
In formula:Preceding set secondary cooling water flow, unit are poured to open:m3/h;
For the secondary cooling water flow after spraying rack position adjustment, unit:m3/h;
For the width of strand, unit:m;
Then, computer 17 sends instruction to secondary cooling water flow electromagnetic regulating valve PLC23, and secondary cooling water flow electromagnetic is adjusted The aperture of valve 15 is turned down, while monitors the number that secondary cooling water flow sensor 16 is fed back in real time using 10ms ~ 20ms by the cycle Value, when the numerical value is equal toWhen, computer 17 then sends instruction to secondary cooling water flow electromagnetic regulating valve PLC23, by secondary cooling water stream The aperture of amount solenoid valve 15 is fixed, it is ensured that secondary cooling water flow no longer changes;
Step 6:After completing to pour steel production, perform step 1 again by staff and operate, and according to the production schedule, it is accurate The standby step 2 that carries out operates.

Claims (4)

1. prevent the system of micro alloyed steel strand continuous casting chink defect, it is characterised in that:It includes secondary cooling water spraying rack lifting dress Put, secondary cooling water flow regulator and Process Control System, the secondary cooling water spraying rack lowering or hoisting gear is by pneumatic cylinder(1), piston (2)And piston rod(3)Form, piston rod(3)Upper end and piston(2)Connection, piston(2)It is assemblied in pneumatic cylinder(1)It is middle by air pressure Cylinder is divided into epicoele and cavity of resorption, epicoele side wall respectively with epicoele air inlet pipe(4)With epicoele escape pipe(5)Connection, epicoele air inlet pipe(4) Upper installation epicoele solenoid valve(6), epicoele escape pipe(5)Upper installation epicoele electromagnetic switch valve(7);Cavity of resorption side wall is respectively with Chamber air inlet pipe(8)With cavity of resorption escape pipe(9)Connection, cavity of resorption air inlet pipe(8)Upper installation cavity of resorption solenoid valve(10), cavity of resorption outlet Pipe(9)Upper installation cavity of resorption electromagnetic switch valve(11);Epicoele is provided with upper cavity pressure sensor(12)And displacement transducer(13), under Chamber is provided with cavity of resorption pressure sensor(14);The secondary cooling water flow regulator is by fan-shaped section secondary cooling water main line Secondary cooling water flow electromagnetic regulating valve(15)With secondary cooling water flow sensor(16)Form;The Process Control System is by computer (17)And respectively with computer(17)Connection carries out the epicoele solenoid valve PLC of data communication(18), cavity of resorption electromagnetism regulation Valve PLC(19), epicoele electromagnetic switch valve PLC(20), cavity of resorption electromagnetic switch valve PLC(21), pneumatic cylinder feedback of the information PLC(22)、 Secondary cooling water flow electromagnetic regulating valve PLC(23), secondary cooling water flow feedback PLC(24)Composition;Epicoele solenoid valve PLC(18)With Epicoele solenoid valve(6)It is connected, cavity of resorption solenoid valve PLC(19)With cavity of resorption solenoid valve(10)It is connected;Epicoele Electromagnetic switch valve PLC(20)With epicoele electromagnetic switch valve(7)Connection, cavity of resorption electromagnetic switch valve PLC(21)With cavity of resorption electromagnetic switch Valve(11)It is connected;Pneumatic cylinder feedback of the information PLC(22)Simultaneously with upper cavity pressure sensor(12), cavity of resorption pressure sensor(14) And displacement transducer(13)It is connected, secondary cooling water flow electromagnetic regulating valve PLC(23)With secondary cooling water flow electromagnetic regulating valve(15) It is connected, secondary cooling water flow feedback PLC(24)With secondary cooling water flow sensor(16)It is connected;The secondary cooling water spraying rack lifting Device is 4 sets, its piston rod(3)Lower end respectively with being installed on import and export position two of the fan-shaped section underframe along throwing direction 4 underframe supports of side(25)Upper surface be fixedly connected;Secondary cooling water spraying rack(26)Respectively with 4 sets of secondary cooling water spraying rack liters The pneumatic cylinder of falling unit(1)Side wall is fixedly connected.
2. the system as claimed in claim 1 for preventing micro alloyed steel strand continuous casting chink defect, it is characterised in that:Described two is cold The pneumatic cylinder of Water spray frame lowering or hoisting gear(1)Epicoele overflow valve is also equipped with epicoele and cavity of resorption(27)With cavity of resorption overflow valve (28);Epicoele escape pipe(5)With cavity of resorption escape pipe(9)Remote and pneumatic cylinder(1)One end of connection is provided with screen pack(29).
3. the application method of the system for preventing micro alloyed steel strand continuous casting chink defect described in any one claim as described above, It is characterized in that:It comprises the following steps:
Step 1:Manual-lock epicoele solenoid valve(6), cavity of resorption solenoid valve(10), epicoele electromagnetic switch valve(7), cavity of resorption Electromagnetic switch valve(11)With secondary cooling water flow electromagnetic regulating valve(15);
Step 2:By computer(17)Mode of operation be adjusted to " open and pour preceding control " pattern, then, computer(17)According to existing The instruction of field operator, is controlled, concrete operations to secondary cooling water spraying rack lowering or hoisting gear, secondary cooling water flow regulator respectively Step is:
(1), control computer(17)To epicoele solenoid valve PLC(18)Command signal is sent, opens epicoele solenoid valve (6), now pressure-air enter pneumatic cylinder in the presence of ambient pressure(1)Epicoele;Meanwhile to cavity of resorption electromagnetic switch valve PLC(21)Command signal is sent, opens cavity of resorption electromagnetic switch valve(11), pneumatic cylinder(1)To moving up under the pressure of pressure-air It is dynamic, drive secondary cooling water spraying rack to be lifted to peak together;Displacement transducer(13)After feeding back highest dot position information, Control computer(17)By epicoele solenoid valve(6)With cavity of resorption electromagnetic switch valve(11)Close, realize secondary cooling water spraying rack with Pneumatic cylinder(1)Stood in highest order motionless;
(2), control computer(17)To secondary cooling water flow electromagnetic regulating valve PLC(23)Command signal is sent, two are controlled by the PLC Cold water flow solenoid valve(15)Open, now high pressure secondary cooling water is from each spray gun on spraying rack(30)Middle ejection, Secondary cooling water flow sensor(16)Secondary cooling water flow feedback PLC can be passed through(24)In real time to computer(17)Feed back secondary cooling water house steward Data on flows, according to the data, pass through computer(17)In real time to secondary cooling water flow electromagnetic regulating valve PLC(23)Send instruction letter Number, adjust secondary cooling water flow electromagnetic regulating valve(23)Aperture, secondary cooling water flow is met production technology sets requirement;
(3), when secondary cooling water flow sensor(16)Feedback result matched with the cooling water flow of manufacturing technique requirent after, control Computer processed(17)To secondary cooling water flow electromagnetic regulating valve PLC(23)Command signal is sent, by secondary cooling water flow electromagnetic regulating valve (15)Close, then according to step(2)In spraying effect, each spray gun on manual fine-tuning secondary cooling water spraying rack(30)Incline Rake angle, it is ensured that each row's spray gun on spraying rack(30)The cooling water sprayed can completely, be uniformly sprayed onto strand(31) Whole inner arc on, realize the uniform cooling of strand inner arcuate surface;
Step 3:To computer(17)Middle input secondary cooling water spray gun(30)Spray angle and strand(31)Width parameter, ought Preceding moment secondary cooling water spray rack position is defined as dead-center position;
Step 4:After formally pouring steel, by computer(17)Mode of operation be adjusted to " open and controlled after pouring " pattern, manually to calculating Machine(17)The peak width L of middle input strand inner arc edge not cooled water injection along inner arc central axis direction, is calculated Machine(17)Corresponding pneumatic cylinder can be calculated first according to its plug-in(1)The distance moved down, i.e.,:
In formula:The peak width of strand inner arc edge not cooled water injection along inner arc central axis direction, unit:m;
For pneumatic cylinder(1)Need the distance moved down, unit:m;
After the completion of calculating, computer(17)Can be to cavity of resorption solenoid valve PLC(19)Instruction is sent, controls cavity of resorption solenoid valve (10)Open, now pressure-air enters pneumatic cylinder in the presence of ambient pressure(1)Cavity of resorption, at the same time, computer (17)To epicoele electromagnetic switch valve PLC(20)Command signal is sent, by epicoele electromagnetic switch valve(7)Open, now, pneumatic cylinder (1)It will move down, then computer(17)Using 10ms ~ 20ms as cycle monitoring displacement transducer(13)The number fed back Value, when the numerical value is equal toWhen, then computer(17)Can be simultaneously to cavity of resorption solenoid valve PLC(19)With epicoele electromagnetic switch valve PLC(20)Instruction is sent, by cavity of resorption solenoid valve(10)With epicoele electromagnetic switch valve(7)Close, it is ensured that pneumatic cylinder(1)At this Position transfixion;
Step 5:After the operation of step 4 is completed, computer(17)By its plug-in, ensureing strand(31)Inner arcuate surface On the premise of cooling water inflow in unit area is constant, pneumatic cylinder is calculated(1)The adjustment amount of secondary cooling water flow after change in location, i.e.,:
In formula:Preceding set secondary cooling water flow, unit are poured to open:m3/h;
Then, computer(17)To secondary cooling water flow electromagnetic regulating valve PLC(23)Instruction is sent, secondary cooling water flow electromagnetic is adjusted Valve(15)Aperture turn down, while secondary cooling water flow sensor is monitored as the cycle using 10ms ~ 20ms in real time(16)Fed back Numerical value, when the numerical value is equal toWhen, computer(17)Then to secondary cooling water flow electromagnetic regulating valve PLC(23)Instruction is sent, will Secondary cooling water flow electromagnetic regulating valve(15)Aperture fix, it is ensured that secondary cooling water flow no longer changes;
Step 6:After completing to pour steel production, perform step 1 again by staff and operate, and according to the production schedule, prepare into Row step 2 operates.
4. preventing the application method of the system of micro alloyed steel strand continuous casting chink defect as claimed in claim 1, its feature exists In:Strand inner arc edge peak width L of not cooled water injection along inner arc central axis direction is pin in the step 4 Simulation on Temperature Field experiment to different microalloy steel grades is drawn;Secondary cooling water spray gun in the step 4(30)Spray angle Scope is 110 ° ~ 120 °.
CN201610000423.2A 2016-01-04 2016-01-04 Prevent the system and its application method of micro alloyed steel strand continuous casting chink defect Active CN105478704B (en)

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CN107303601B (en) * 2016-04-20 2020-03-06 宝山钢铁股份有限公司 Cooling monitoring system and method for casting blank
CN113843403B (en) 2020-06-25 2023-01-20 宝山钢铁股份有限公司 Method for improving surface cracks of casting blank by using ferrite phase
CN114734012A (en) * 2022-03-30 2022-07-12 东北大学 Slab surface quenching system and process based on horizontal section of continuous casting machine

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