CN108746525A - Bloom consistency takes into account the continuous cast method of control with homogeneity - Google Patents
Bloom consistency takes into account the continuous cast method of control with homogeneity Download PDFInfo
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- CN108746525A CN108746525A CN201810700007.2A CN201810700007A CN108746525A CN 108746525 A CN108746525 A CN 108746525A CN 201810700007 A CN201810700007 A CN 201810700007A CN 108746525 A CN108746525 A CN 108746525A
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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
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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
- B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
-
- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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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
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- 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
Abstract
The present invention relates to the continuous cast methods that a kind of bloom consistency and homogeneity take into account control, are suitable for 360mm × 450mm section blooms, belong to bloom continuous casting production technical field.The present invention is on the basis of M-EMS, electromagnetic agitation equipment is additionally arranged between two cold-zones and solidification end, and the installation site and running parameter of the two are rationally designed, it is further that M+F-EMS technology and " under solidification end weight " technique are subjected to matching application, finally superheat of liquid steel is poured into a mould in conjunction with control, poring rate, cooling parameter etc., improve the compactness and homogenieity of bloom steel continuous casting billet, in addition, pass through the fillet parameter designing to tube type mold, optimize the cooling of strand corner, improve the control of strand corner defect.By the improvement to cooling water channel, to ensure uniformity of conducting heat so that crystallizer exit casting blank shell thickness is uniform.Present invention can ensure that bloom steel continuous casting billet comprehensive quality high level controls.
Description
Technical field
The present invention relates to the continuous cast method that a kind of bloom consistency and homogeneity take into account control, be suitable for 360mm ×
450mm section blooms, belong to bloom continuous casting production technical field.
Background technology
With being constantly progressive for society, the life pursuit that people improve increasingly constantly pushes every profession and trade fast-developing.As
The performance requirement of one of basic material being most widely used, steel material has also constantly pushed new height to；Secondly as
The impetus of market economy itself, steel market environment with keen competition promote the steel products production of low cost, high quality
Technological development becomes inevitable.All the time, the good and bad of blank quality significantly determines product quality performance, also determines naturally
High efficiency, low cost, high-quality production feasibility.Technological difficulties focus primarily upon existing for the high quality of production of bloom continuous casting
Center segregation of casting blank, center porosity, central pipe control, this is because in bloom continuous casting production process, center portion setting time
Long, liquid core length increases, and the feeding of solidification latter stage is difficult, caused by center segregation of casting blank control is difficult.
With the continuous development of continuous casting technology, the advantage of bloom continuous casting high efficiency, low cost promotes it gradually to substitute molding life
Produce high-end big specification product forms, such as axle, oxygen cylinder steel, Big sized gear.But compared to molding, continuous casting blooms strand
The rolling reduction of rolling large-size product forms is smaller, and the strand shrinkage cavity defect of large-size cannot obtain during the rolling process
Effective soldering, and then cause stocking flaw detection and performance that cannot meet the requirements well.The control of casting process Inner Quality of Billet is asked
Topic is the key that limit product capability and performance, and in all kinds of Inner Quality of Billet defects, gross segregation is " homogenieity " and center
Loose i.e. " compactness " control is always the key problem of continuous casting research.Domestic and foreign scholars are to Stirring During Continuous Casting, solidification end
The techniques such as pressure have carried out numerous studies.Wherein, Stirring During Continuous Casting mainly drives solidification front molten steel strong by rotating excitation field
System disturbance, optimized temperature field and flow field improve solidification and develop dynamic conditions, solidified shell is promoted uniformly to develop, promote solidification
The molten steel of forward position solute mixes fortune again, and then effectively promotes steel homogeneity.In addition, solidification end soft reduction process is by squeezing
Central pipe size is transmitted to center portion and then is reduced in pressure, deformation, improves center portion segregation.
Currently, it is more to the research of Stirring During Continuous Casting and solidification end soft reduction process technology both at home and abroad, and practical application
In the process, the metallurgical effect of Stirring During Continuous Casting and solidification end soft reduction process in the presence of overlapping with interact, and it is each have by oneself
Stressed.Control, i.e. bloom continuous casting electromagnetic agitating technology and solidification end are taken into account for bloom consistency and homogeneity
It is then rare in terms of soft reduction process matching correct to be related to.
Such as：
CN107262689A discloses convex sufficient roll structure and soft reduction process, especially one kind under a kind of bloom two is cold-pressed and relates to
And convex sufficient roll structure and soft reduction process under the cold pressing of bloom two of technical field of ferrous metallurgy.Under the bloom two of the present invention is cold-pressed
Convex foot roll structure, including sufficient roller and sufficient roller under pressure area in area are depressed, it is described to depress sufficient roller sufficient roller in pressure area under area
Lower section is provided with boss in the pressure area in the middle part of sufficient roller, sufficient roller middle part is provided with boss, the pressure area under the pressure area
The boss of lower foot roller is longer than the boss of sufficient roller in pressure area.The lower area's soft reduction process of the cold pressing of bloom two of the present invention, setting are multigroup
It depresses sufficient roller in area and depresses sufficient roller under area, the drafts of sufficient roller gradually increases in throwing direction in the pressure area.The application
It can effectively solve the problems, such as bloom continuous casting base center segregation and center porosity.But it is generous for 360mm × 450mm sections
The particular content for the technical method that base consistency takes into account control with homogeneity is not directed to.
CN106735013A discloses a kind of continuous casting process improving bloom quality of primary blank, this is simple for process, changes
It is kind to open the contact for pouring molten steel with copper plate of crystallizer, increase lubrication, prevent angle seam and scrape steel phenomenon, effectively avoids opening base surface of gravying with meat or vegetables poured over rice or noodles and lack
It falls into, ensures excellent bloom quality of primary blank, while also improving the service life of copper plate of crystallizer.It is characterized in that including following
Step：(1) casting machine starts the preceding 40 ± 5min of cast, lubrication of crystallizer agent is smeared on crystallizer copper wall, and fill, especially tied
Brilliant device corner；Mode is smeared in the lubrication of crystallizer agent：It is uniformly smeared using roller, primary to smear, natural wind
Dry 5 ± 1min, then carries out secondary smearing, and other preparations opened and pour preceding routine are carried out after natural air drying；(2) casting process
In, open when pouring filled graphite at copper plate of crystallizer angle seam, control stopper open degree is 30~45% when cast, and steel stream is normally to pour
The 40~60% of casting, after the operation, other open of normal control pours work, to starting to walk, pulling rate stabilization in 0.45m/min or
0.48m/min.But the tool of the technical method of control is taken into account for 360mm × 450mm section bloom consistency and homogeneity
Hold in vivo and is not directed to.
CN107225148A disclose it is a kind of providing a kind of milling method of 22CrMoH pinion steels, by cogging temperature
The adjusting of degree, final rolling temperature, finishing temperature, pass deformation, the cold technique of control, can effectively reduce the length/width ratio of MnS field trashes,
The austenite structure that state is organized as flattening is rolled according to the pinion steel that the method obtains, precipitate size is 20~25nm, is precipitated
It is 0.31~0.38% to measure weight fraction；After heat treatment, austenite grain size is 5~7 μm, impact of collision toughness ratio approach
In 1.It is characterized in that the milling method includes the following steps：(1) the heated stove heat of continuous casting billet, goes through high-pressure water descaling
Except iron scale；(2) continuous casting billet after dephosphorization carries out cogging and obtains bloom；(3) bloom is rolled into Continuous mill train；(4) go out
Water mist cooling is carried out after Continuous mill train；(5) enter slow cooling bed after water mist cooling and carry out slow cooling；(6) enter burial pit and carry out slow cooling；
(7) air-cooled, it can be obtained hot rolling 22CrMoH gear round steel.But for 360mm × 450mm section bloom consistency and
The particular content that matter degree takes into account the technical method of control is not directed to.
CN106967931A discloses a kind of 20Cr2Ni4 pinion steels and its production technology, which uses
20Cr2Ni4 is made, and the mass percentage of Mo is in 20Cr2Ni4：0.15~0.30%.Its production technology include dispensing,
Electric arc furnace smelting, refining furnace are smelted, and molten steel melts in arc furnace smelting procedure, and temperature reaches 1570~1590 DEG C, and sampling carries out
Detection and analysis, make the mass percentage of Mo reach 0.15~0.30%；In refining furnace smelting process, temperature reaches 1570~
1590 DEG C, sampling is detected analysis, and the mass percentage of Mo is made to reach 0.15~0.30%.The present invention reduces to be mingled in steel
Object reduces H, O, N gas content in steel, reduces harmful element P, S, As, Sn in steel, appropriate Mo is added, and can improve steel use
In components such as large gear, axis, in quenching degree, heat resistance, crystal grain thinning, the improved combination properties such as hardness of steel are improved.Its feature
It is, the mass percentage of Mo is in 20Cr2Ni4：0.15~0.30%.But it is generous for 360mm × 450mm sections
The particular content for the technical method that base consistency takes into account control with homogeneity is not directed to.
CN105215310A discloses a kind of method of big cross section Properties of Heavy Rail Steel strand center porosity control.It is disclosed by the invention
A kind of method of big cross section Properties of Heavy Rail Steel strand center porosity control, includes the following steps：The degree of superheat of Baogang's liquid in control；Normally
In casting process, pulling rate is controlled；It is depressed in solidification end in casting process；The stirring for setting M-EMS is strong
Degree and stirring frequency；Set the stirring intensity and stirring frequency of solidification end electromagnetic agitation；Control crystallizer cooling water inflow and two
Cold water ratio.It can be effectively controlled using the center porosity of big cross section heavy rail steel billet of this method production, strand is inside remaining
Quality can obtain effective guarantee.It is characterized in that：Include the following steps (1) control in packet superheat of liquid steel 25 DEG C~35 DEG C it
Between；(2) in normal casting process, casting speed control is between 0.68m/min~0.72m/min；(3) in solidification in casting process
End carries out the pressure that drafts is 15mm~20mm；(4) by the stirring intensity of M-EMS be set as 300A~
400A, stirring frequency are 2.0~3.0Hz；(5) stirring intensity of solidification end electromagnetic agitation is set as 300A~400A, stirred
It is 67.0~8.0Hz to mix frequency；(6) between 3550~3650L/min, Water Rate for Secondary Cooling Water exists control crystallizer cooling water inflow
Between 0.31~0.35L/kg.But the skill of control is taken into account for 360mm × 450mm section bloom consistency and homogeneity
The particular content of art method is not directed to.
Invention content
The technical problem to be solved by the present invention is to：The continuous casting that a kind of bloom consistency takes into account control with homogeneity is provided
Method is suitable for 360mm × 450mm section blooms, can promote the compactness and homogenieity of steel continuous casting billet, it is ensured that bloom is cast
Base quality high level controls, and the high-quality production for high-end big specification sectional material blank under the conditions of low rolling reduction provides important technology
It ensures.
The technical solution adopted in the present invention is to solve above-mentioned technical problem：Bloom continuous casting produces 42CrMoH steel
Method, using tube type mold, the process parameter control of the cooling water of crystallizer is water flow 3150L/min~3350L/min,
Hydraulic pressure 0.80MPa~0.90MPa；
M-EMS is that the low level in crystallizer exit is installed, and M-EMS equipment cover height is
350mm, lower end are flushed with mouth under crystallizer；M-EMS true field gaussian intensity is measured, magnetic field is stirred with practical
Gaussian intensity is that 280 ± 15Gs is stirred electric current setting, stir current frequency 2.4Hz；
Electromagnetic agitation equipment is installed between two cold-zones and solidification end, it is solidification which, which equips installation site,
The region that linear ratio is 0.45~0.47；Actual measurement stirring magnetic field gaussian intensity, by true field gaussian intensity for 200 ± 25Gs into
Row stir current intensity is arranged, and stir current frequency is 7.0Hz；Water Rate for Secondary Cooling Water presses 0.301Lkg-1 Steel~0.323Lkg-1 SteelIt is configured；
Solidification end is 2#~7# withdrawal straightening machines, wherein 2#~6# withdrawal straightening machines using dynamic weight soft reduction process, pressure range
It depresses roller to depress for plain-barreled roll, single roller drafts is controlled by 1mm~3mm, and the pressure roller of 7# withdrawal straightening machines is under convex roll-in, under single roll-in
Amount is controlled by 8mm~10mm.
For the 1st heat of middle packet casting, cast superheat of liquid steel control is at 25 DEG C~45 DEG C；For the of middle packet casting
2~N heats, cast superheat of liquid steel control is at 15 DEG C~35 DEG C；
Casting speed control is in 0.45m/min~0.55m/min.
It is further：The corner fillet size of tube type mold is R20mm.The cooling of strand corner can be optimized in this way, changed
Kind strand corner defect control.
It is further：The cooling water channel of tube type mold is two into two times, and there are two water inlet and two water outlets for tool.
It can guarantee heat transfer uniformity in this way；Ensure that crystallizer exit casting blank shell thickness is uniform, shell thickness size is preferably controlled in
16mm~20mm.Crystallizer cooling water can be fine-tuned using DN250 regulating valves in water inlet when implementation, to better ensure that
Crystallizer exit casting blank shell thickness is uniform.
It is further：Electromagnetic agitation equipment installation site between two cold-zones and solidification end also can be by following parameter
Control：Mounted on apart from the sections crystallizer molten steel surface 10.0m~11.0m.
The beneficial effects of the invention are as follows：On the basis of M-EMS, increase between two cold-zones and solidification end
If electromagnetic agitation equipment, and the installation site and running parameter of the two are rationally designed, it is further will combine
Formula electromagnetic agitating technology carries out matching application with " under solidification end weight " technique, finally in conjunction with control cast molten steel overheat
Degree, poring rate, cooling parameter etc. improve the compactness and homogenieity of bloom steel continuous casting billet, in addition, by tubular type knot
The fillet parameter designing of brilliant device, the cooling of optimization strand corner improve the control of strand corner defect.By changing to cooling water channel
Into to ensure uniformity of conducting heat so that crystallizer exit casting blank shell thickness is uniform.Present invention can ensure that bloom steel continuous casting
Base comprehensive quality high level controls.
Specific implementation mode
With reference to embodiment, the invention will be further described.
In embodiment, the electromagnetic agitation equipment installed between two cold-zones and solidification end, referred to as " between two cold and solidifications
End electromagnetic agitation " (S~F-EMS).
Embodiment 1
The embodiment is certain steel mill method production 360mm × 450mm section LZ50 axle steel continuous castings using the present invention
Bloom.The present invention specific implementation mode be：(1) M+F-EMS is crystallizer exit by M-EMS
Low level installation, M-EMS equip cover height 350mm, lower end is flushed with mouth under crystallizer；Crystallizer electromagnetism stirs
True field 280 ± 15Gs of gaussian intensity is mixed, stir current is set as 490A~510A, stir current frequency 2.4Hz；" between
Two cold and solidification end electromagnetic agitations " (S~F-EMS) installation site is to solidify the region that linear ratio is 0.45~0.47, specifically
For apart from the sections crystallizer molten steel surface 10.0m~11.0m, stirring magnetic field gaussian intensity is 200 ± 25Gs, and stir current intensity is
210A~220A, stir current frequency are 7.0Hz.(2) under solidification end weight in terms of technology controlling and process：Pressure range is 2#~7#
Withdrawal straightening machine, wherein 2#~6# withdrawal straightening machines are depressed roller and are depressed for plain-barreled roll, put into operation by single roller drafts 1.5mm~3mm, under plain-barreled roll stagnation pressure
Amount is 8.6mm, and it is under convex roll-in that 7# withdrawal straightening machines, which depress roller, and single roller drafts is controlled by 8mm~10mm, in bloom width direction
Between region overall reduction be 16.6mm~18.6mm.
In addition, the corresponding casting parameters system of present invention matching is specially：Using tube type mold, corner fillet size
For R20mm；It is two into two times to design tube type mold water route, ensures heat transfer uniformity；Crystallizer is equipped with cooling water inflow
3150L/min~3350L/min, hydraulic pressure 0.80MPa~0.90MPa fine-tune crystallizer cooling using DN250 regulating valves
Water；Water Rate for Secondary Cooling Water is 0.301Lkg-1 Steel~0.323Lkg-1 Steel.Superheat of liquid steel (middle packet casting) control is poured into a mould at 17 DEG C
~32 DEG C, the first heat of middle packet, the degree of superheat is controlled at 25 DEG C~45 DEG C；By casting speed control in 0.45m/min~0.55m/min,
Target pull rate 0.50m/min constant speed duration of pouring ratios are 92.6%.
Casting process Mold liquid level stabilizing, covering slag thickness distribution are uniform.Low power is carried out to continuous casting blooms
Detection；Corroded using cold sour dendrite, detection strand cross section shell thickness distribution situation, the results show that the present invention was produced
LZ50 axle steel continuous casting bloom shell thicknesses are circumferentially distributed uniformly along section, and whole control is in 16mm~20mm；Strand corner
Portion's quality is good, and in-situ metal Scanning Detction is carried out to continuous casting billet tunneling boring, and strand tunneling boring homogeneity is 0.918~0.932,
Center portion consistency is 0.915~0.940, corresponding bite low power grading center segregation, center porosity≤0.5 grade, without in
Heart shrinkage cavity.
Embodiment 2
The embodiment is that certain steel mill method production 360mm × 450mm section 45M Fine Steel Casting irons using the present invention connect
Cast bloom.The present invention specific implementation mode be：(1) M+F-EMS is exported by M-EMS for crystallizer
The low level at place is installed, and M-EMS equips cover height 350mm, and lower end is flushed with mouth under crystallizer；Crystallizer electromagnetism
True field 280 ± 5Gs of gaussian intensity is stirred, stir current is set as 491A~500A, stir current frequency 2.4Hz；" between
Two cold and solidification end electromagnetic agitations " (S~F-EMS) installation site is to solidify the region that linear ratio is 0.45~0.47, specifically
For apart from the sections crystallizer molten steel surface 10.0m~11.0m, stirring magnetic field gaussian intensity is 200 ± 25Gs, and stir current intensity is
214A~218A, stir current frequency are 7.0Hz.(2) under solidification end weight in terms of technology controlling and process：Pressure range is 2#~7#
Withdrawal straightening machine, wherein 2#~6# withdrawal straightening machines are depressed roller and are depressed for plain-barreled roll, put into operation by single roller drafts 1.0mm~3mm, under plain-barreled roll stagnation pressure
Amount is 9.0mm, and it is under convex roll-in that 7# withdrawal straightening machines, which depress roller, and single roller drafts is controlled by 8.6mm~10mm, bloom width direction
Intermediate region overall reduction is 17.6mm~19.0mm.
In addition, the corresponding casting parameters system of present invention matching is specially：Using tube type mold, corner fillet size
For R20mm；It is two into two times to design tube type mold water route, ensures heat transfer uniformity；Crystallizer is equipped with cooling water inflow
3157L/min~3340L/min, hydraulic pressure 0.82MPa~0.87MPa fine-tune crystallizer cooling using DN250 regulating valves
Water；Water Rate for Secondary Cooling Water is 0.311Lkg-1 Steel~0.320Lkg-1 Steel；Superheat of liquid steel (middle packet casting) control is poured into a mould at 16 DEG C
~35 DEG C, the first heat of middle packet, the degree of superheat is controlled at 27 DEG C~43 DEG C；By casting speed control in 0.47m/min~0.53m/min,
Target pull rate 0.50m/min constant speed duration of pouring ratios are 95%.
Casting process Mold liquid level stabilizing, covering slag thickness distribution are uniform.Low power is carried out to continuous casting blooms
Detection；Corroded using cold sour dendrite, detection strand cross section shell thickness distribution situation, the results show that the present invention was produced
45M Fine Steel Casting iron continuous casting blooms shell thicknesses are circumferentially distributed uniformly along section, and whole control is in 17mm~18.6mm；Strand
Corner quality is good, to continuous casting billet tunneling boring carry out in-situ metal Scanning Detction, strand tunneling boring homogeneity be 0.904~
0.931, center portion consistency is 0.910~0.936, and corresponding bite low power grading center segregation, center porosity are ≤0.5
Grade, non-stop layer shrinkage cavity.
Embodiment 3
The embodiment is that certain steel mill method production 360mm × 450mm section 42CrMoA continuous castings using the present invention are generous
Base.The present invention specific implementation mode be：(1) M+F-EMS is the low of crystallizer exit by M-EMS
Position installation, M-EMS equip cover height 350mm, and lower end is flushed with mouth under crystallizer；M-EMS is real
Border magnetic field 280 ± 15Gs of gaussian intensity, M-EMS true field 280 ± 10Gs of gaussian intensity, stir current setting
For 495A~510A, stir current frequency 2.4Hz；" between two cold and solidification end electromagnetic agitations " (S~F-EMS) installation site
Magnetic is stirred specially apart from the sections crystallizer molten steel surface 10.0m~11.0m in the region for being 0.45~0.47 for solidification linear ratio
Field gaussian intensity is 200 ± 25Gs, and stir current intensity is 215A~220A, and stir current frequency is 7.0Hz.(2) solidification end
It holds under weight in terms of technology controlling and process：Pressure range is 2#~7# withdrawal straightening machines, and wherein 2#~6# withdrawal straightening machines pressure roller is depressed for plain-barreled roll,
It puts into operation by 1.5~3mm of single roller drafts, plain-barreled roll overall reduction is 8.8mm, and it is single roll-in under convex roll-in that 7# withdrawal straightening machines, which depress roller,
Lower amount is controlled by 9.2mm~10mm, and bloom width direction intermediate region overall reduction is 17.0mm~18.8mm.
In addition, the corresponding casting parameters system of present invention matching is specially：Using tube type mold, corner fillet size
For R20mm；It is two into two times to design tube type mold water route, ensures heat transfer uniformity；Crystallizer is equipped with cooling water inflow
3255L/min~3350L/min, hydraulic pressure 0.85MPa~0.90MPa fine-tune crystallizer cooling using DN250 regulating valves
Water；Water Rate for Secondary Cooling Water is 0.312Lkg-1 Steel~0.322Lkg-1 Steel.Superheat of liquid steel (middle packet casting) control is poured into a mould at 15 DEG C
~35 DEG C, the first heat of middle packet, the degree of superheat is controlled at 29 DEG C~45 DEG C；By casting speed control in 0.46m/min~0.55m/min,
Target pull rate 0.50m/min constant speed duration of pouring ratios are 90.3%.
Casting process Mold liquid level stabilizing, covering slag thickness distribution are uniform.Low power is carried out to continuous casting blooms
Detection；Corroded using cold sour dendrite, detection strand cross section shell thickness distribution situation, the results show that the present invention was produced
42CrMoA continuous casting blooms shell thickness is circumferentially distributed uniformly along section, and whole control is in 17.8mm~20mm；Strand corner
Quality is good, carries out in-situ metal Scanning Detction to continuous casting billet tunneling boring, strand tunneling boring homogeneity is 0.907~0.936, the heart
Portion's consistency is 0.912~0.934, corresponding bite low power grading center segregation, center porosity≤0.5 grade, non-stop layer
Shrinkage cavity.
Above-described embodiment illustrates, after technical scheme of the present invention, 360mm × 450mm section bloom strands
Quality control is good, and strand corner zero-fault, shell thickness is uniformly distributed circumferentially, and strand tunneling boring homogenieity is preferable, center portion
Loose and shrinkage cavity is effectively controlled, and the high-caliber control of strand center portion consistency, center porosity, center segregation low multiple quality are commented
Grade norm controlling is more excellent, other capability and performances are all qualified.
Claims (5)
1. bloom consistency takes into account the continuous cast method of control with homogeneity, it is characterised in that：Using tube type mold, crystallizer
Cooling water process parameter control be water flow 3150L/min~3350L/min, hydraulic pressure 0.80MPa~0.90MPa；
M-EMS is that the low level in crystallizer exit is installed, and it is 350mm that M-EMS, which equips cover height,
Lower end is flushed with mouth under crystallizer；M-EMS true field gaussian intensity is measured, it is strong with practical stirring magnetic field Gauss
Degree is that 280 ± 15Gs is stirred electric current setting, stir current frequency 2.4Hz；
Electromagnetic agitation equipment is installed between two cold-zones and solidification end, it is that solidification is linear which, which equips installation site,
Than the region for 0.45~0.47；Actual measurement stirring magnetic field gaussian intensity is that 200 ± 25Gs is stirred by true field gaussian intensity
Current strength setting is mixed, stir current frequency is 7.0Hz；Water Rate for Secondary Cooling Water presses 0.301Lkg-1 Steel~0.323Lkg-1 SteelInto
Row setting；
Solidification end is 2#~7# withdrawal straightening machines, the wherein pressure of 2#~6# withdrawal straightening machines using dynamic weight soft reduction process, pressure range
Roller is depressed for plain-barreled roll, and single roller drafts is controlled by 1mm~3mm, and the pressure roller of 7# withdrawal straightening machines is under convex roll-in, and single roller drafts is pressed
8mm~10mm is controlled；
For the 1st heat of middle packet casting, cast superheat of liquid steel control is at 25 DEG C~45 DEG C；For 2~N of middle packet casting
Heat, cast superheat of liquid steel control is at 15 DEG C~35 DEG C；
Casting speed control is in 0.45m/min~0.55m/min.
2. bloom consistency as described in claim 1 takes into account the continuous cast method of control with homogeneity, it is characterised in that：Tubular type
The corner fillet size of crystallizer is R20mm.
3. bloom consistency as described in claim 1 takes into account the continuous cast method of control with homogeneity, it is characterised in that：Tubular type
The cooling water channel of crystallizer is two into two times, and there are two water inlet and two water outlets for tool.
4. the bloom consistency as described in any one of claims 1 to 3 takes into account the continuous cast method of control with homogeneity,
It is characterized in that：Shell thickness size Control is in 16mm~20mm.
5. the bloom consistency as described in any one of claims 1 to 3 takes into account the continuous cast method of control with homogeneity,
It is characterized in that：Electromagnetic agitation equipment installation site between two cold-zones and solidification end is apart from crystallizer molten steel surface 10.0m
The sections~11.0m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810700007.2A CN108746525A (en) | 2018-06-29 | 2018-06-29 | Bloom consistency takes into account the continuous cast method of control with homogeneity |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810700007.2A CN108746525A (en) | 2018-06-29 | 2018-06-29 | Bloom consistency takes into account the continuous cast method of control with homogeneity |
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| CN108746525A true CN108746525A (en) | 2018-11-06 |
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|---|---|---|---|
| CN201810700007.2A Withdrawn CN108746525A (en) | 2018-06-29 | 2018-06-29 | Bloom consistency takes into account the continuous cast method of control with homogeneity |
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Cited By (2)
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| CN113862458A (en) * | 2021-09-27 | 2021-12-31 | 芜湖新兴铸管有限责任公司 | High-temperature diffusion heating process for reducing micro-area carbon segregation of axle steel billet LZ50 |
| CN114032442A (en) * | 2021-11-11 | 2022-02-11 | 建龙北满特殊钢有限责任公司 | Preparation method of 200-square continuous casting billet for high-homogeneity carbon wire rod |
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| CN105803149A (en) * | 2016-03-23 | 2016-07-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Equiaxial crystal ratio control method for 35CrMo round pipe billet with phi 280 mm |
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| CN113862458A (en) * | 2021-09-27 | 2021-12-31 | 芜湖新兴铸管有限责任公司 | High-temperature diffusion heating process for reducing micro-area carbon segregation of axle steel billet LZ50 |
| CN114032442A (en) * | 2021-11-11 | 2022-02-11 | 建龙北满特殊钢有限责任公司 | Preparation method of 200-square continuous casting billet for high-homogeneity carbon wire rod |
| CN114032442B (en) * | 2021-11-11 | 2022-03-25 | 建龙北满特殊钢有限责任公司 | Preparation method of 200-square continuous casting billet for high-homogeneity carbon wire rod |
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Application publication date: 20181106 |