CN108356242A - A kind of micro alloyed steel sheet billet Corner Crackss control equipment and technique - Google Patents
A kind of micro alloyed steel sheet billet Corner Crackss control equipment and technique Download PDFInfo
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- CN108356242A CN108356242A CN201810329636.9A CN201810329636A CN108356242A CN 108356242 A CN108356242 A CN 108356242A CN 201810329636 A CN201810329636 A CN 201810329636A CN 108356242 A CN108356242 A CN 108356242A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/0408—Moulds for casting thin slabs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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Abstract
A kind of micro alloyed steel sheet billet Corner Crackss control equipment of present invention offer and technique, are related to the thin plate blank continuously casting and continuously rolling technology field of steel.Control equipment, which includes two cooling preparation waters, corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer and crystallizer narrow-face foot roller area, newly enhances spray system, and the new spray system that enhances includes newly-increased water supply pipe, new enhancing spraying rack and matches water control system.In control technique, the matching hydraulic art with hydraulic art, width face entirety slowly-cooling and carry out dynamic water allocation of spray system is newly enhanced using corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer, entirety enhancing cooling technique collaboration crystallizer narrow-face foot roller area.The present invention, which can stablize, realizes that strand corner tissue microalloy carbonitride dispersion is precipitated, itself strengthens strand corner tissue, strand wick-containing large deformation is promoted to depress process leptoprosopy metal simultaneously dynamic to side arc stream, strand corner stress is reduced, " effecting a permanent cure " controls micro alloyed steel sheet billet cracks of steel side cape and generate.
Description
Technical field
The present invention relates to the thin plate blank continuously casting and continuously rolling technology fields of steel more particularly to a kind of micro alloyed steel sheet billet corner to split
Line control equipment and technique.
Background technology
Continuous casting and rolling technique of sheet bar is developed in the end of the eighties in last century, the beginning of the nineties, is a kind of completely new short route band
Steel production new technique is substantially distinguished from traditional strip production technology at present, has notable energy saving, high production yield, production work
The advantages that skill is simplified, producing line is brief, life cycle of the product is short is developed very rapid in recent years.
Sheet billet rhythm of production is compact, if strand production process generates face crack, by the strand that is produced can not under
Line removing surface, follow-up tandem rolling product will generate notable surface quality defect.It is further preferred that sheet billet is in continuous casting
Production is containing micro alloyed steels processes such as Nb, B, Al, by such steel high temperature coagulation characteristic and follow-up strand production process heat/mechanical behavior
Function influence, strand production process show high face crack sensibility, and strand corner takes place frequently severe crack, and then causes it
Tandem rolling roll bending edge generates the major qualities defects such as " rotten side ", " chip off-falling " afterwards, receives industry concern.
In order to effectively eliminate micro alloyed steel sheet blank continuous casting process Corner Crackss defect, application No. is 201020149011.3
Utility model patent, disclosing a kind of working face, to be that inner concave arc surface structure, bosh cross-section center straight line are arranged thin
Slab caster mould narrow copper plate structure.It is by using the mold structure, strand process of setting angle in crystallizer
Portion forms obtuse angle corner structure and far from crystallizer bosh, and strand is solidified in crystallizer and follow-up continuous casting mistake
The corner temperature in the areas such as journey aligning is significantly increased, and to avoid the third brittle temperature zone of steel, reduces the production of strand corner crack
It is raw.Application No. is 201120089500.9 utility model patents, disclose a kind of chamfer crystallizer for sheet blank continuous casting
Narrow copper plate, by folding corner region arcwall face structure design, in addition to sheet billet right-angle structure, strand corner is in bending and rectifys
The temperature of the processes such as straight significantly improves, and reduces the generation of sheet billet cracks of steel side cape.Application No. is 200720089029.7 realities
With new patent, a kind of leptoprosopy crystallizer of similar folding corner region arc-shaped surface structure, strand corner are equally disclosed
Crackle control principle is similar with the utility model patent application No. is 201120089500.9.In the recent period, application No. is
201710511057.1 patent of invention, disclose a kind of method that control CSP niobium-containing low steels side is split.It mainly passes through control
Molten steel composition processed, tundish precision protective casting, continuous casting two cold bending roll inner arc increase T-shape rhone and rolled
The controls such as journey heating temperature and drafts reduce niobium-containing low steel side crackle and generate.
In addition, the scientific paper of entitled " the CSP hot-rolled sheet coil edge cracks origin causes of formation and control " discloses one kind and passing through control
Molten steel carbon processed and nitrogen equal size, optimization Oscilation Parameters of Mold and two are cold with measures such as hydraulic arts, reduce micro alloyed steel sheet billet
Corner crack generates；The scientific paper of entitled " the transverse fissure genetic analysis of sheet billet angle " is proposed using raising sheet billet temperature and drop
The two kinds of measures of low nitrogen content carry out the generation of anti-angle till transverse fissure；The science on entitled " CSP continuous-casting sheet billets side be cleaved into because with control "
Paper is proposed by reducing Cu, N component content in steel and avoiding peritectoid range, reduce by two cold water distributions and increase intersection fan-shaped section
The methods of spraying water check plate, optimization covering slag physical property control micro alloyed steel Corner Crackss generate.
In recent years, through deeply being detected to micro-alloyed steel continuous casting base high temperature coagulation characteristic and sheet blank continuous casting production process strand
Stress system of behavior is analyzed, and it is strand corner tissue clearly to have caused the key factor that micro alloyed steel sheet billet corner crack generates
High temperature coagulation process cooling velocity is insufficient, causes microalloy carbonitride to organize crystal boundary to be concentrated in chain along it and is precipitated, causes to cast
Organize embrittlement of grain boundaries in base corner.At the same time, since sheet blank continuous casting pulling rate is high, strand is in the two cold-zone domains such as grid, 1 section fan-shaped
Intensity of cooling it is big, cause into fan-shaped 1 section of strand corner temperature too low, the strand side in wick-containing large deformation pressure process
Originally brittle group is woven in that concentrated stress effect is lower to generate serious cracking in corner.Therefore, Fast Cooling micro alloyed steel sheet billet angle
Portion's high temperature coagulation process organization, its microalloy carbonitride of dispersion improve the modeling of strand corner tissue in organizing transgranular precipitation
Property, while properly increasing strand and entering the corner temperature of wick-containing pressure section and reduce its stress, it is to solve micro alloyed steel sheet billet
The fundamental way that cracks of steel side cape takes place frequently.
And it can be seen that it from the above-mentioned current micro alloyed steel sheet billet Corner Crackss control method announced and be based on steel more
Third brittle temperature zone principle, by being passivated two cold weak cold water distribution technologies (packet of the design of crystallizer corner structure or exploitation casting stream
Include water guide method) improve the temperature that the areas such as aligning are crossed in strand corner, reduce strand corner crack and generate, or by control molten steel at
Point and protective casting, reduce steel in microalloy and nitrogen content, to reduce microalloy carbonitride in continuous casting billet structure crystal boundary
Amount of precipitation is not the basic mechanism generated from microalloy sheet billet Corner Crackss, the control of actual implementation process crackle
Effect is not very ideal.At the same time, the ingredients such as Narrow Composition Control molten steel composition or reduction nitrogen in steel, it is real in actually steel-making etc.
It is big to apply process difficulty, and is difficult to stability contorting.Therefore, each sheet billet producing line fails to control its microalloy comprehensively both at home and abroad at present
Steel strand crackle generates.
In actually containing the micro-alloyed steel continuous castings production processes such as Nb, B, Al, carbonitride is in crystal boundary, dislocation, homogeneous etc.
Precipitation Temperature under nucleation mode focuses mostly in 730 DEG C~1120 DEG C sections, and the strand corner of the temperature range is through even
Strand produces whole process, i.e. crystallizer, foot roll area, grid area, 1~3 section of sector and bending and aligning area.Sheet billet casting is studied carefully in detail
Solidification and heat transfer feature is flowed, and combines micro alloyed steel Carbonitride Precipitation dynamics, if can be realized in crystallizer and the areas Zu Gundeng
Strand corner is quickly cooled down, and so that its corner temperature before entering grid area is down to 700 DEG C or less (keeps strand corner subcutaneous
10mm range temperatures are down to 730 DEG C of ＜), then strand corner microalloy carbonitride can be made in the transgranular dispersion analysis of tissue
Go out, concentrates Precipitation Embrittlement brilliant along corner tissue crystal boundary to solve micro alloyed steel sheet blank continuous casting process microalloy carbonitride
The problem on boundary.It is above-mentioned control cold measure by force on the basis of, if can be designed by crystallizer corner structure, make strand corner solidify shape
At contribute to strand leptoprosopy metal in the shape that flow to side arc direction of wick-containing pressure process, while slow down strand grid area with
Whole cooling level in 1 section fan-shaped improves the temperature that strand corner enters wick-containing reduction section, then can be expected to that strand is greatly reduced
The corner stress of process is depressed in wick-containing, to which fundamentally control micro alloyed steel strand Corner Crackss generate comprehensively.
Therefore, a kind of in conjunction with practical micro alloyed steel high temperature coagulation feature and sheet blank continuous casting production technology and equipment, exploitation
It can fundamentally stablize and eliminate technique and its relevant equipment that micro alloyed steel sheet blank continuous casting process Corner Crackss generate, to realizing
Micro alloyed steel sheet billet is high-quality, efficiently has important practical significance with greenization production.
Invention content
The technical problem to be solved by the present invention is in view of the above shortcomings of the prior art, provide a kind of micro alloyed steel sheet billet
Corner Crackss control equipment and technique can be stablized and realize that strand corner tissue microalloy carbonitride dispersion is precipitated, itself
Strengthen strand corner tissue, while promoting strand wick-containing large deformation to depress process leptoprosopy metal and being moved to side arc stream, reduces strand
Corner stress, " effecting a permanent cure " control micro alloyed steel sheet billet cracks of steel side cape and generate.
In order to solve the above technical problems, the technical solution used in the present invention is：
On the one hand, the present invention provides a kind of micro alloyed steel sheet billet Corner Crackss control equipment, which includes two cold matching
Water system, crystallizer and crystallizer narrow-face foot roller area newly enhance spray system；
Wherein, two cooling preparation waters in the wide face of strand are cold with water system using original two based on target surface temperature control
System；
The crystallizer is corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer, and the inner surface of narrow copper plate works
Face is laterally with the symmetrical Gauss concave curve structure in its transverse width center, according to different sheet billet sections from top to bottom
Thickness, two of the surface side that works under the peak of curve point to narrow face copper plate of crystallizer respective heights of the Gauss concave curve structure
The vertical range value of corner line is 4.5mm~10.0mm；
The inner surface working face of the narrow face copper plate of crystallizer is to cater to strand leptoprosopy along wide face center side along short transverse
To the consecutive variations curved configuration of solidification shrinkage characteristic；The back side of the narrow copper plate and two sides are straight line knot
Structure；
The bosh of the narrow face copper plate of crystallizer is circular configuration, and along in a vertical shape point of crystallizer short transverse
Cloth, the sink cross sectional dimensions close to crystallizer folding corner region are narrow copper plate width direction central region sink cross sectional dimensions
1.0~1.2 times, sink number by the cross sectional dimensions of narrow copper plate width and sink codetermine；The cross section of each sink
The line at center is in integrally to concave towards the Gaussian curve structure of narrow copper plate working face, and each sink is with narrow copper plate transverse width
Center line is symmetrical；Wherein, sink center or near narrow copper plate width centreline pair at narrow copper plate width centreline
The distance that 2 sink center of distribution are wired to narrow copper plate working face is referred to as 20mm~30mm；Near narrow copper plate side
Water trough distance narrow copper plate corresponding side surface 5.0mm~10.0mm, at narrow copper plate width centreline sink center or near
2 symmetrical sink center's lines of narrow copper plate width centreline and 2 sink center near narrow copper plate side
The distance change of line ranging from 2.0mm~10.0mm；Other sink distributing positions are wide along copper coin by its cross-section center line
Spend direction equidistantly distributed；
The narrow face copper plate of crystallizer is mouth narrow structure under upper mouth width, according to the slab thickness of institute's continuous casting, leptoprosopy copper
The width difference of the suitable for reading and lower mouth of plate is 0.2mm~1.0mm, is linearly decreased to lower mouth by upper edge short transverse；Narrow copper plate
Thickness is bigger, suitable for reading bigger with lower mouth width degree difference；Narrow copper plate is suitable for reading identical as the lower thickness of mouth, narrow copper plate short transverse
On central region thickness be consecutive variations curve values of the described suitable for reading or lower mouth thickness+correspondence working face along short transverse；
The altitude range of the narrow face copper plate of crystallizer is 900mm~1300mm；
The corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer, it is 50mm~135mm's to be suitable for section thickness
All sheet blank continuous castings only need to ensure that the installation site of its crystallizer meniscus and lower mouth and classic flat-plate type are narrow using process
The position of the meniscus of face copper plate of crystallizer and lower mouth is identical；
Crystallizer narrow-face foot roller area newly enhances spray system, including newly-increased water supply pipe, new enhancing spraying rack and
It is strong cooling with water control system；
The basic design parameters of the newly-increased water supply pipe are as follows：
1. pipeline hydraulic pressure：It is 0.3MPa~1.0MPa to send the water pressure to new enhancing spraying rack；
2. piping flow：Pipeline water supply capacity is 500L/min~800L/min；
3. according to pipeline pressure and traffic requirement, it is equipped with mating pipeline flowmeter and remote-controllable adjustment valve；
The new enhancing spraying rack is fixed on the corner efficient heat transfer leptoprosopy Gauss concave curved surface narrow face copper plate of crystallizer
Underface, and be connected with the newly-increased water supply pipe；The length of the new enhancing spraying rack is that crystallizer is exported to grid
Area's entrance；The nozzle of the new enhancing spraying rack is conical, massive nozzle or square solid nozzle, cooling or pure using aerosol
Water cooling mode, face strand inner arc and outer arc corner spray by force, according to slab thickness section variation, ensure the strong of strand corner
Spraying cooling sphere of action is changed to 75mm from apart from corner point 30mm；Each nozzle end extended line between strand corner at a distance from
For 50mm~150mm；The spray angle of nozzle according to pipeline hydraulic pressure, nozzle between strand corner at a distance from synthesis determination be selected as
30 °~90 °；The number of nozzle is codetermined by the spray angle of nozzle and the length of spraying rack, and the nozzle of each direction is along height
Direction is equally spaced；Nozzle maximum stream flow is close by its spray angle and the maximum flow of water needed for the maximum intensity of cooling of strand corner
Degree codetermines；
Water control system is matched in the strong cooling, independently of the existing secondary cooling control system of thin-slab caster, and is adopted
Dynamic control is carried out with based on steel grade classification, water meter control strategy associated with pulling rate, i.e., phase is selected according to produced steel grade
The water meter answered, and then corresponding cooling water inflow is issued according to current water meter and corresponding pulling speed of continuous casting, collaboration thin-slab caster is existing
There is the wide face foot roll area of two cooling preparation waters to spray water distribution by force, the cooling in strand corner in dynamic control foot roll area.
On the other hand, the present invention also provides a kind of micro alloyed steel sheet billet Corner Crackss control techniques, using above-mentioned micro- conjunction
Golden steel sheet base Corner Crackss control equipment is realized, the following contents is specifically included：
The micro alloyed steel sheet billet Corner Crackss control technique, crystallizer use above-mentioned micro alloyed steel sheet billet side
Corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer in chink line control equipment, adjusts the wide face of the crystallizer and leptoprosopy is cold
But water flow meets cooling velocity whole process of the strand corner point in crystallizer and stablizes the condition for being more than 5.0 DEG C/s；
The wide face foot roll area of crystallizer is based on the existing two cold water distributions based on target surface temperature control of sheet billet
System carries out dynamic water allocation using whole enhancing cooling technique, and collaboration crystallizer narrow-face foot roller area newly enhances matching for spray system
The temperature of hydraulic art, control strand corner into grid area is down to 700 DEG C hereinafter, and ensureing strand corner being averaged in grid area
Cooling velocity reaches 20 DEG C/s~35 DEG C/s；
Strand, based on existing two cooling preparation waters based on target surface temperature control of sheet billet, is adopted in grid area
Carry out dynamic water allocation with hydraulic art with wide face entirety slowly-cooling, control strand enter fan-shaped I section of corner temperature meet rise again to
Condition more than 860 DEG C；
Strand in fan-shaped I sections based on existing two cooling preparation waters based on target surface temperature control of sheet billet,
Dynamic water allocation is carried out with hydraulic art using wide face entirety slowly-cooling, control strand go out fan-shaped I section of corner temperature meet rise again to
Condition more than 920 DEG C；
Strand go out it is I sections fan-shaped after, the areas follow-up two Leng Ge are all made of the cold technique of sheet billet tradition control.
It is using advantageous effect caused by above-mentioned technical proposal：It splits micro alloyed steel sheet billet provided by the invention corner
Line control equipment and technique, corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer can adequately compensate for strand in crystallizer
Solidification shrinkage, be significantly increased strand corner cooling velocity, refinement strand corner initial set tissue crystal grain and dispersion microalloy
Carbonitride temperature end is precipitated；Meanwhile cooling then can further dispersion microalloy carbon nitridation by force in strand two cold foot roll area corner
Object low-temperature end is precipitated, and improves strand corner and organizes plasticity, solves traditional micro alloyed steel sheet blank continuous casting production process corner life
At the problem of friable tissues；At the same time, the continuous casting billet produced using the crystallizer, leptoprosopy is Gauss arcuate structure, high
Effect promotes strand wick-containing large deformation pressure process leptoprosopy metal dynamic to side arc stream, reduces strand corner stress, to " control comprehensively
This " control micro alloyed steel sheet billet cracks of steel side cape generation.
Description of the drawings
Fig. 1 is the leptoprosopy of sheet billet corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer provided in an embodiment of the present invention
Copper coin dimensional structure diagram；
Fig. 2 is that narrow face copper plate of crystallizer provided in an embodiment of the present invention is suitable for reading or lower mouth structure schematic diagram；
Fig. 3, which is sheet billet provided in an embodiment of the present invention, newly enhances spraying rack schematic diagram.
In figure：1, crystallizer leptoprosopy Gauss concave curved surface；2, crystallizer leptoprosopy bosh；3, on narrow face copper plate of crystallizer
Mouthful；4, mouth under narrow face copper plate of crystallizer；5, narrow copper plate side；6, newly enhance spraying rack；7, strand corner.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
Mould wall thickness is produced for the SS400- of 90mm with 4.0m/min pulling speed of continuous casting to a kind of CSP below in conjunction with the accompanying drawings
B steel sheet base embodiments are described further.
Micro alloyed steel sheet billet Corner Crackss control equipment in the present embodiment, including two cooling preparation waters, crystallizer and knot
Jing Qi narrow-face foot rollers area newly enhances spray system.Wherein, two cooling preparation waters in the wide face of strand are based on target surface using original
Temperature controlled two cooling preparation water.Used crystallizer is corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer,
The structure of narrow copper plate is as depicted in figs. 1 and 2, wherein 1 expression crystallizer leptoprosopy Gauss concave curved surface, that is, inner surface working face, 2
Indicate crystallizer leptoprosopy bosh, 3 indicate that narrow face copper plate of crystallizer is suitable for reading, and 4 indicate mouth under narrow face copper plate of crystallizer, and 5 indicate
The one of side of narrow copper plate, 6, indicate new enhancing spraying rack, 7 indicate strand corners, l1Indicate that narrow face copper plate of crystallizer is high
Degree, l2Indicate narrow face copper plate of crystallizer width suitable for reading, l3Indicate mouth width degree under narrow face copper plate of crystallizer, C1Indicate crystallizer leptoprosopy
Working face is along the distribution curve of short transverse, C2Indicate crystallizer leptoprosopy working face transverse direction Gauss concave curve, l4Indicate leptoprosopy copper
It sink center or is wired near 2 symmetrical sink center of narrow copper plate width centreline narrow at plate width centreline
The distance of face copper plate working surface, l5Indicate narrow face copper plate of crystallizer near proximal side sink at a distance from narrow copper plate side, l6Table
Show that narrow face copper plate of crystallizer is suitable for reading or lower mouth thickness, l7Indicate that working face transverse direction Gaussian curve peak point is corresponded to the narrow copper plate
The vertical range of two corner lines of height work surface side, Δ l indicate at narrow copper plate width centreline sink center or most
The 2 sink center lines symmetrical close to narrow copper plate width centreline and 2 sinks near narrow copper plate side
The distance of the line of centres.Narrow face copper plate of crystallizer height l1For 1100mm, mouth narrow structure under mouth width is presented, mouth width under crystallizer
Degree is 90mm, suitable for reading 3 with the width difference l of lower mouth 42-l3For 0.2mm, by suitable for reading 3 under crystallizer short transverse is linearly decreased to
Mouth 4；On narrow face copper plate of crystallizer thickness direction, the thickness l of narrow copper plate suitable for reading 3 is designed6It is identical as the thickness of lower mouth 4,
For 60mm.It is selected as shown in table 1 along short transverse curve distribution and efficiently caters to strand leptoprosopy along wide face center position solidification shrinkage
The curve C of characteristic1, the thickness of narrow copper plate short transverse central region is suitable for reading or lower mouth thickness+correspondence working face edge height
The distribution curve C in direction1Value.
1 sheet billet narrow copper plate working face of table is along short transverse curve values
In the present embodiment, the inner surface working face transverse direction Gauss concave curve C of narrow face copper plate of crystallizer2It is selected as distribution letter
NumberCoordinate system using narrow copper plate wherein a corner point is origin, x is along narrow copper plate width
Direction, y are directed toward the copper coin back side along narrow copper plate thickness direction, by inner surface working face.Narrow copper plate working face is equal from top to bottom
To be lateral concave structure with the Gaussian curve function, along C1 curve compensations, Gauss concave curved surface structure, concave curved are formed from top to bottom
The vertical range of work surface side two corners portion line of the Gaussian curve peak point in face away from the narrow face copper plate of crystallizer under respective heights
Value l7For 6.0mm.
Narrow copper plate back side and two sides 5 are linear structure.
In the present embodiment, in order to accelerate crystallizer corner cooling velocity, the bosh 2 of narrow face copper plate of crystallizer is circle
Structure designs 4 sinks, penetrates through distribution vertically along crystallizer short transverse altogether；The line of each sink cross-section center is whole
In the Gaussian curve structure for concaving towards working face 1, and it is symmetrical with narrow copper plate transverse width center line, Gaussian curve is distributed letter
Number isWherein, 2 sink diameters in the middle part of narrow copper plateIt is selected as 13mm, 2 sinks of edge
Diameter is selected as 15mm.Crystallizer is suitable for reading or 2, the middle part sink cross-section center of lower mouth be wired to narrow copper plate working face away from
From l4For 23.69mm.2 sinks of narrow copper plate edge arrive the distance l of narrow copper plate corresponding side surface respectively5For 5.5mm, near
2 symmetrical sink center's lines of narrow copper plate width centreline and 2 sink center's lines near copper coin side
Distance, delta l be 4.1mm, 4 sinks are along narrow copper plate width direction equidistantly distributed.
It is cooled down to reinforce strand outer arc angle portion in foot roll area, the new enhancing of installation in the underface of narrow face copper plate of crystallizer
Spray system.In the present embodiment, the crystallizer narrow-face foot roller area newly enhances spray system, including newly-increased water supply pipe,
Water control system is matched in new enhancing spraying rack 6 and strong cooling.Wherein, it is as follows that water supply pipe basic design parameters are increased newly：
1. pipeline hydraulic pressure：It is 0.8MPa to send the water pressure to new enhancing spraying rack 6；
2. piping flow：Piped water supply ability is 600L/min；
3. being equipped with the pneumatic diaphragm control valve (gas of pipeline flowmeter and remote-controllable that mating useful range is 800L/min
Pass formula).
In the present embodiment, the new enhancing spraying rack 6 is fixed on immediately below narrow face copper plate of crystallizer, and with newly-increased confession
Water lines are fixedly connected.The length of new enhancing spraying rack 6 is that crystallizer is exported to grid area entrance.New enhancing spraying rack 6 is to casting
The using effect schematic diagram that base corner 7 carries out strong spraying cooling is as shown in Figure 3.The nozzle of new enhancing spraying rack 6 is selected as jet angle
60 ° of conical, massive pure water spray spout, nozzle maximum stream flow assign 28L/min in 0.8MPa hydraulic pressure.Nozzle with by up to
Outer arc staggered mode face strand inner arc and outer arc leptoprosopy corner arrangement in lower, strand side leptoprosopy totally 8 nozzles, 4
It is a towards strand inner arc corner, 4 towards strand outer arc corner, each nozzle is along short transverse equidistantly distributed, and its end is prolonged
Long line distance l between corresponding strand corner8For 70mm, ensure strand leptoprosopy corner spray by force coverage area be from corner point to
In the range of the point 45mm of corner.In specific implementation, strand leptoprosopy corner sprays by force coverage area according to slab thickness section
Variation change to from corner point to the range apart from corner 75mm from corner point to apart from corner 30mm.
The crystallizer narrow-face foot roller area newly enhances spray system, strong cooling existing independently of CSP with water control system
There is secondary cooling control system, is controlled using based on steel grade classification, water meter control strategy associated with pulling rate, i.e., it is different
The corresponding water that issues is stored in the form of water meter in database under steel grade and its different casting, and system is according to the steel produced
Kind, corresponding water meter is selected, is had with the current pulling speed of continuous casting of water control system Auto-matching, corresponding cooling water inflow is issued, is cooperateed with
The original wide face foot roll areas based on target surface temperature control of CSP spray by force water distribution, strand corner in dynamic control foot roll area
It is cooling.For example, in the present embodiment, based on above-mentioned crystallizer corner efficient heat transfer Gauss spill narrow copper plate crystallizer basis
On, set the wide face centre of surface temperature of the wide face foot roll area of crystallizer newly enhances spray system as 965 DEG C, crystallizer narrow-face foot roller area
400L/min waters, the then temperature that SS400-B steel strand corner into grid area can be achieved are down to 700 DEG C or less, average cooling speed
It spends up to 24 DEG C/s or more.
A kind of micro alloyed steel sheet billet Corner Crackss control technique is controlled using above-mentioned micro alloyed steel sheet billet Corner Crackss
Equipment is realized.In the present embodiment, efficient using the corner in micro alloyed steel sheet billet Corner Crackss described above control equipment
Conduct heat leptoprosopy Gauss concave curved surface crystallizer, and can guarantee that strand corner is cold with leptoprosopy cooling water inflow using the former wide face of crystallizer
But speed whole process, which is stablized, is more than 10 DEG C/s.
In the present embodiment, it is based on above-mentioned crystallizer corner efficient heat transfer Gauss spill narrow copper plate crystallizer, based on CSP
Existing two cooling preparation waters based on target surface temperature control, it is whole strong cooling with hydraulic art, setting using the wide face of strand
The wide face centre of surface temperature of the wide face foot roll area of crystallizer is 965 DEG C, crystallizer narrow-face foot roller area newly enhances spray system and issues
400L/min waters, the then temperature that SS400-B steel strand corner into grid area can be achieved are down to 700 DEG C or less, average cooling speed
It spends up to 24 DEG C/s or more.
In the present embodiment, on the basis of above-mentioned control is cold, strand is based on object table in grid area based on CSP is existing
Temperature controlled two cooling preparation water in face matches hydraulic art using wide face entirety slowly-cooling, sets the wide face center of strand of grid area
1033 DEG C of target surface temperature, it is ensured that strand, which enters fan-shaped I sections of corner temperature and meets, rises again to more than 860 DEG C of condition.
In the present embodiment, cooling of the strand in I sections fan-shaped is controlled based on CSP is existing based on target surface temperature
Two cooling preparation waters, using wide face entirety slowly-cooling match hydraulic art, set I sections of sector strand wide face focus target surface temperature
1054 DEG C of degree, it is ensured that strand, which goes out fan-shaped I section of corner temperature and meets, rises again to more than 920 DEG C.Strand go out it is I sections fan-shaped after,
The areas follow-up two Leng Ge are all made of the cold technique of sheet billet tradition control.
By above-mentioned micro alloyed steel sheet billet Corner Crackss control equipment and control technique, it can stablize and realize CSP productions
SS400-B steel sheet base corner tissue BN dispersions are precipitated, itself strengthens strand corner tissue, while promoting strand wick-containing
Large deformation is depressed process leptoprosopy metal and is moved to side arc stream, and strand corner stress is reduced, and " effecting a permanent cure " control sheet billet corner is split
Line generates.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
To modify to the technical solution recorded in previous embodiment, either which part or all technical features are equal
It replaces；And these modifications or replacements, model defined by the claims in the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (2)
1. a kind of micro alloyed steel sheet billet Corner Crackss control equipment, it is characterised in that：The equipment includes two cooling preparation waters, knot
Brilliant device and crystallizer narrow-face foot roller area newly enhance spray system；
Wherein, two cooling preparation waters in the wide face of strand are using original two cooling preparation waters based on target surface temperature control；
The crystallizer is corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer, and the inner surface working face of narrow copper plate is horizontal
To be from top to bottom with the symmetrical Gauss concave curve structure in its transverse width center, according to different sheet billet sections thickness
It spends, the work surface side angles Liang Ge under the peak of curve point to narrow face copper plate of crystallizer respective heights of the Gauss concave curve structure
The vertical range value of portion's line is 4.5mm~10.0mm；
The inner surface working face of the narrow face copper plate of crystallizer is to cater to strand leptoprosopy to coagulate along wide face center position along short transverse
Gu the consecutive variations curved configuration of shrinkage character；The back side of the narrow copper plate and two sides are linear structure；
The bosh of the narrow face copper plate of crystallizer is circular configuration, and along the distribution in a vertical shape of crystallizer short transverse, is leaned on
The sink cross sectional dimensions of nearly crystallizer folding corner region is the 1.0 of narrow copper plate width direction central region sink cross sectional dimensions
~1.2 times, sink number is codetermined by the cross sectional dimensions of narrow copper plate width and sink；The cross-section center of each sink
Line is in integrally to concave towards the Gaussian curve structure of narrow copper plate working face, and each sink is with narrow copper plate transverse width center line
It is symmetrical；Wherein, sink center or symmetrical near narrow copper plate width centreline at narrow copper plate width centreline
2 sink center be wired to narrow copper plate working face distance be 20mm~30mm；Sink near narrow copper plate side
The sink center or near leptoprosopy copper at narrow copper plate corresponding side surface 5.0mm~10.0mm, narrow copper plate width centreline
2 symmetrical sink center's lines of plate width centreline and 2 sink center's lines near narrow copper plate side
Distance change ranging from 2.0mm~10.0mm；Other sink distributing positions are by its cross-section center line along copper coin width direction
Equidistantly distributed；
The narrow face copper plate of crystallizer is mouth narrow structure under upper mouth width, according to the slab thickness of institute's continuous casting, narrow copper plate
Width difference suitable for reading with lower mouth is 0.2mm~1.0mm, is linearly decreased to lower mouth by upper edge short transverse；Narrow copper plate thickness
It is bigger, it is suitable for reading bigger with lower mouth width degree difference；Narrow copper plate is suitable for reading identical as the lower thickness of mouth, in narrow copper plate short transverse
Central region thickness is consecutive variations curve values of the described suitable for reading or lower mouth thickness+correspondence working face along short transverse；
The altitude range of the narrow face copper plate of crystallizer is 900mm~1300mm；
The corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer, it is all of 50mm~135mm to be suitable for section thickness
Sheet blank continuous casting only needs the installation site and classic flat-plate type leptoprosopy knot that ensure its crystallizer meniscus and lower mouth using process
The meniscus of brilliant device copper coin and the position of lower mouth are identical；
Crystallizer narrow-face foot roller area newly enhances spray system, including newly-increased water supply pipe, new enhancing spraying rack (6) and strong
It is cooling to match water control system；
The basic design parameters of the newly-increased water supply pipe are as follows：
1. pipeline hydraulic pressure：It is 0.3MPa~1.0MPa to send the water pressure to new enhancing spraying rack；
2. piping flow：Pipeline water supply capacity is 500L/min~800L/min；
3. according to pipeline pressure and traffic requirement, it is equipped with mating pipeline flowmeter and remote-controllable adjustment valve；
The new enhancing spraying rack (6) is fixed on the corner efficient heat transfer leptoprosopy Gauss concave curved surface narrow face copper plate of crystallizer
Underface, and be connected with the newly-increased water supply pipe；The length of the new enhancing spraying rack (6) is that crystallizer is exported to lattice
Grid region entrance；The nozzle of the new enhancing spraying rack (6) is conical, massive nozzle or square solid nozzle, is cooled down using aerosol
Or pure water cooling mode, face strand inner arc and outer arc corner spray by force, according to slab thickness section variation, ensure strand corner
Strong spraying cooling sphere of action be from corner point to apart from corner point 30mm~75mm；Each nozzle end extended line and strand angle
Distance between portion is 50mm~150mm；The spray angle of nozzle according to pipeline hydraulic pressure, nozzle between strand corner at a distance from integrate
Determination is selected as 30 °~90 °；The number of nozzle is codetermined by the spray angle of nozzle and the length of spraying rack, each direction
Nozzle is equally spaced along short transverse；Nozzle maximum stream flow is needed for its spray angle and strand corner maximum intensity of cooling
Maximum flow of water density codetermines；
Water control system is matched in the strong cooling, independently of the existing secondary cooling control system of thin-slab caster, and uses base
Dynamic control is carried out in steel grade classification, water meter control strategy associated with pulling rate, i.e., is selected according to produced steel grade corresponding
Water meter, and then corresponding cooling water inflow is issued according to current water meter and corresponding pulling speed of continuous casting, cooperate with thin-slab caster existing two
The wide face foot roll area of cooling preparation water sprays by force water distribution, the cooling in strand corner in dynamic control foot roll area.
2. a kind of micro alloyed steel sheet billet Corner Crackss control technique, using micro alloyed steel sheet billet as described in claim 1
Corner Crackss control equipment is realized, it is characterised in that：
The micro alloyed steel sheet billet Corner Crackss control technique, crystallizer use microalloy as described in claim 1
Corner efficient heat transfer leptoprosopy Gauss concave curved surface crystallizer in steel sheet base Corner Crackss control equipment, it is wide to adjust the crystallizer
Face and leptoprosopy cooling water flow meet cooling velocity whole process of the strand corner point in crystallizer and stablize the item for being more than 5.0 DEG C/s
Part；
The wide face foot roll area of crystallizer based on sheet billet it is existing based on target surface temperature control two cooling preparation waters,
Dynamic water allocation is carried out using whole enhancing cooling technique, cooperates with the knot in the micro alloyed steel sheet billet Corner Crackss control equipment
Jing Qi narrow-face foot rollers area newly enhance spray system match hydraulic art, control strand corner into grid area temperature be down to 700 DEG C with
Under, and ensure that average cooling rate of the strand corner in grid area reaches 20 DEG C/s~35 DEG C/s；
Strand in grid area based on sheet billet it is existing based on target surface temperature control two cooling preparation waters, using width
Face entirety slowly-cooling carries out dynamic water allocation with hydraulic art, control strand enter fan-shaped I section of corner temperature meet rise again to more than
860 DEG C of condition；
Strand, based on existing two cooling preparation waters based on target surface temperature control of sheet billet, uses in fan-shaped I sections
Wide face entirety slowly-cooling carries out dynamic water allocation with hydraulic art, control strand go out fan-shaped I section of corner temperature meet rise again to more than
920 DEG C of condition；
Strand go out it is I sections fan-shaped after, the areas follow-up two Leng Ge are all made of the cold technique of sheet billet tradition control.
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| CN111992685A (en) * | 2020-08-10 | 2020-11-27 | 湖南华菱涟源钢铁有限公司 | Method for reducing edge-rot defects of steel coil of Q355B in thin slab continuous casting and rolling production line |
| CN112404382A (en) * | 2020-10-30 | 2021-02-26 | 山东钢铁集团日照有限公司 | Method for reducing bow defects of casting blank of ultra-wide slab continuous casting machine |
| CN112743055A (en) * | 2020-12-29 | 2021-05-04 | 马鞍山钢铁股份有限公司 | Crystallizer device for refining original austenite grain size of continuous casting slab corner |
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| CN115069997A (en) * | 2022-05-31 | 2022-09-20 | 天津钢铁集团有限公司 | Casting blank corner spray cooling structure based on slab caster narrow surface foot roll |
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| CN112404382B (en) * | 2020-10-30 | 2022-03-08 | 山东钢铁集团日照有限公司 | Method for reducing bow defects of casting blank of ultra-wide slab continuous casting machine |
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| CN113145817B (en) * | 2020-12-24 | 2023-01-10 | 山东寿光巨能特钢有限公司 | Method for controlling microcracks on surface of manganese-containing steel large round billet |
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| CN114054710A (en) * | 2021-11-13 | 2022-02-18 | 攀钢集团研究院有限公司 | Method for improving center quality of large-section rectangular continuous casting billet |
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| CN115069997A (en) * | 2022-05-31 | 2022-09-20 | 天津钢铁集团有限公司 | Casting blank corner spray cooling structure based on slab caster narrow surface foot roll |
| CN115090847A (en) * | 2022-05-31 | 2022-09-23 | 天津钢铁集团有限公司 | Spraying cooling control system and control method for corner of plate blank after being discharged from crystallizer |
| CN115090847B (en) * | 2022-05-31 | 2024-03-08 | 天津钢铁集团有限公司 | Spray cooling control system and control method for corner of slab after exiting crystallizer |
| CN115415489A (en) * | 2022-09-05 | 2022-12-02 | 东北大学 | Aluminum/aluminum alloy thin slab continuous casting equipment and process |
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