CN208116707U - Slab quality and improve the control device of middle and later periods solid-liquid two-phase region mobility during a kind of continuous casting and solidifying - Google Patents
Slab quality and improve the control device of middle and later periods solid-liquid two-phase region mobility during a kind of continuous casting and solidifying Download PDFInfo
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- CN208116707U CN208116707U CN201820433490.8U CN201820433490U CN208116707U CN 208116707 U CN208116707 U CN 208116707U CN 201820433490 U CN201820433490 U CN 201820433490U CN 208116707 U CN208116707 U CN 208116707U
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Abstract
The utility model discloses slab quality during a kind of continuous casting and solidifying and the control devices of improvement middle and later periods solid-liquid two-phase region mobility, belong to metallurgical continuous casting technical field.The utility model is 25% >=b1 in continuous casting billet metal liquid fraction>It is provided with end exciting force bringing device at 0 position, and is 75% >=b2 in continuous casting billet metal liquid fraction>Middle section exciting force bringing device is provided at 25% position, end exciting force bringing device and middle section exciting force bringing device are respectively used to for applying intermittent exciting force to green shell surface；The exciting force on the green shell surface in continuous casting billet solidification middle section is hit, the dendrite head that solidification front is grown in cooling procedure can be regularly interrupted, promote the growth of equiax crystal；And in the exciting force on the green shell surface of continuous casting billet solidifying end half solidification molten steel can be improved in the feeding capacity of solidification middle and later periods, improvement casting blank inner organization is loose, improves slab quality in strike.
Description
Technical field
The utility model relates to metallurgical continuous casting technical fields, more specifically to slab during a kind of continuous casting and solidifying
Quality and the control device for improving middle and later periods solid-liquid two-phase region mobility.
Background technique
The concrete technology of continuous casting is that molten steel constantly passes through water mold, is connected after congealing into hard shell from crystallizer lower exit port
It is continuous to pull out, through water-spraying control, the foundry technology process of blank is all cut into after solidification.In continuous casting of iron and steel production, due to solidification
The process middle and later periods, with the increase of two-phase section solid phase ratio, the viscosity of molten steel increases, mobility is deteriorated, it is difficult to it is solidifying to supplement molten steel
Gu when the cavity that is formed in solidification end due to volume contraction, then form the loose of solidified structure.Due to the solidification shrinkage of steel
Rate is significantly greater than the non-ferrous metals such as copper, aluminium, and thermal coefficient is far below copper and aluminium, therefore is easier the solidification end in slab
Form center porosity.To solve the above-mentioned problems, many patents and technology are formd in this aspect for a long time, these patents and
Technology is broadly divided into three classes：First is that with solidification end electromagnetic agitating technology, second is that solidification end pressure or rolling casting technology, last
Kind is to mold casting technique with mechanical oscillation.These three types of technologies have been employed in modern steel Foundry Production, but existing
Technique is difficult to effectively improve the loose problem of continuous casting billet structure, so that the properties of steel deteriorate.
In addition, for the consolidated structure for improving slab, improving equiaxial crystal ratio in continuous casting production process, reducing slab center
The loose and component segregation in region, being widely used with electromagnetic agitation is typical application outfield force stirring technique.But electromagnetism stirs
It mixes due to persistently applying constant or alternating electromagnetic force to liquid metal, it is brilliant to become Center Equiaxial Crystal in the dendrite head for brushing disconnected column crystal
While core, also make the dendrite of liquid metal and solidification front that relative motion persistently occur, causes solute element constantly to liquid
Transfer in state metal causes to continue serious macroscopical negative segregation inside the slab of the outfield force zone of action, such as in continuous casting steel machine
Slab white band.Urgent need overcomes the technical problem.
It is retrieved, existing correlation similar techniques disclose.Such as：A kind of continuous casting blooms based on end electromagnetic agitation are gently pressed
Lower technique (publication number：CN103121092A；Publication date：2013.05.29), which is mounted in end electromagnetic stirring device
Air cooling zone after secondary cooling zone, before aligning, it is ensured that when slighter compress is with aligning while carrying out, the liquid phase between column crystal is complete
The internal soundness of steel can be improved in full solidification, the technology.In addition, a kind of bloom continuous
(publication number：CN101648263A；Publication date：2010.02.17), in Continuous Casting Soft Reduction region, pass through slab center solid rate fs
Variation control drafts, and give the relationship of slighter compress rack drafts and slab center solid rate；It can reduce cord
Steel center segregation of casting blank, and improve the center porosity and central pipe of cord steel slab.In addition, a kind of raising continuous casting billet quality
Method and vibration support roller device (publication number CN1586767A；Publication date 2005.03.02), by being tightly attached to outside continuous casting green shell
The vibration support roller of wall is done under the driving of vibroseis while keeping rotating with continuous casting billet surface synchronization perpendicular to slab thickness
Degree direction or the vibration for being parallel to throwing direction, and this vibration is transferred to by the solidified shell with wick-containing by contact；The technology
Continuous casting billet Center Equiaxial Crystal rate is improved by vibration support roller device with reach be obviously improved continuous casting billet central pipe and it is loose,
It reduces segregation and effectively prevents generating using rolling crack caused by solidification end slighter compress.
Utility model content
1. utility model technical problems to be solved
The purpose of this utility model is that improving the loose problem of continuous casting billet structure, and then improve slab quality；
The control device of slab quality during a kind of continuous casting and solidifying provided, in continuous casting billet solidifying end and solidification middle section
Green shell surface apply intermittent exciting force respectively, hit the exciting force on the green shell surface in continuous casting billet solidification middle section, can be with
The dendrite head that solidification front is grown in cooling procedure is regularly interrupted, so that column crystal is converted into the process of equiax crystal, is promoted
The growth of equiax crystal；And strike utilizes the positive touching of solid-liquid two-phase metal in the exciting force on the green shell surface of continuous casting billet solidifying end
Denaturation improves feeding capacity of the half solidification molten steel in the solidification middle and later periods, and then improves slab quality；
A kind of control device of the improvement continuous casting process solidification middle and later periods solid-liquid two-phase region mobility provided, continuous casting billet solidification
The green shell surface of end applies intermittent exciting force, using the positive thixotropy of solid-liquid two-phase metal, improves half solidification molten steel and exists
The feeding capacity of middle and later periods is solidified, improvement casting blank inner organization is loose, improves slab quality.
2. technical solution
In order to achieve the above objectives, technical solution provided by the utility model is：
The control device of slab quality during a kind of continuous casting and solidifying of the utility model is in continuous casting billet metal liquid fraction
25% >=b1>It is provided with end exciting force bringing device at 0 position, and is 75% >=b in continuous casting billet metal liquid fraction2>25%
Position at be provided with middle section exciting force bringing device, end exciting force bringing device and middle section exciting force bringing device are used respectively
In for applying intermittent exciting force to green shell surface.
Preferably, the two sides in continuous casting billet solidification middle section are correspondingly arranged on middle section exciting force bringing device.
Preferably, the exciting force force direction of the middle section exciting force bringing device of continuous casting billet two sides is conllinear.
Preferably, the time interval that the exciting force of end exciting force bringing device applies is 0.0167~2s.
Preferably, the time interval that the exciting force of middle section exciting force bringing device applies is 1-30s.
The control device of a kind of improvement continuous casting process solidification middle and later periods solid-liquid two-phase region mobility of the utility model, even
Slab metal liquid fraction is 25% >=b1>End exciting force bringing device, end exciting force bringing device are provided at 0 position
For applying intermittent exciting force to the green shell surface of solidification end.
Preferably, the exciting force force direction of end exciting force bringing device is perpendicular to green shell surface.
Preferably, the time interval that the exciting force of end exciting force bringing device applies is 0.0167~2s.
3. beneficial effect
Using technical solution provided by the utility model, compared with existing well-known technique, there is following remarkable result：
(1) during a kind of continuous casting and solidifying of the utility model slab quality control device, in continuous casting billet metal liquid phase
Rate is 25% >=b1>It is provided with end exciting force bringing device at 0 position, and is 75% >=b in continuous casting billet metal liquid fraction2>
Middle section exciting force bringing device, end exciting force bringing device and middle section exciting force bringing device point are provided at 25% position
It Yong Yu not be for applying intermittent exciting force to green shell surface, on the green shell surface point of continuous casting billet solidifying end and solidification middle section
Do not apply intermittent exciting force, hits the exciting force on the green shell surface in continuous casting billet solidification middle section, can regularly interrupt
The dendrite head that solidification front is grown in cooling procedure, promotes the growth of equiax crystal while not generating negative segregation；And strike is in continuous casting
The exciting force on base solidification end green shell surface improves half solidification molten steel in solidification using the positive thixotropy of solid-liquid two-phase metal
The feeding capacity in later period improves half solidification molten steel in the feeding capacity of solidification middle and later periods, changes while improving the production of equiax crystal
Kind casting blank inner organization is loose, improves slab quality；
(2) control device of a kind of improvement continuous casting process solidification middle and later periods solid-liquid two-phase region mobility of the utility model,
It is 25% >=b in continuous casting billet metal liquid fraction1>End exciting force bringing device is provided at 0 position, end exciting force applies
Device is used to apply intermittent exciting force to the green shell surface of solidification end and be mentioned using the positive thixotropy of solid-liquid two-phase metal
Feeding capacity of the high half solidification molten steel in the solidification middle and later periods, improvement casting blank inner organization is loose, improves slab quality.
Detailed description of the invention
Fig. 1 is that a kind of improvement continuous casting process of the utility model solidifies the control device of middle and later periods solid-liquid two-phase region mobility
Schematic diagram；
Fig. 2 is the pattern schematic diagram of the round billet microstructure of embodiment 1；
Fig. 3 is the pattern schematic diagram of the round billet microstructure of comparative example 1；
Fig. 4 be embodiment 2 a kind of continuous casting and solidifying during slab quality control device structural schematic diagram；
Fig. 5 be embodiment 3 a kind of continuous casting and solidifying during slab quality control device structural schematic diagram；
Fig. 6 is the pattern schematic diagram of the round billet microstructure of embodiment 2.
Label declaration in schematic diagram：
100, continuous casting billet；110, molten steel is not solidified；120, solidified shell；101, slab concave arc side；102, slab convex arc side；
210, end exciting force bringing device；220, middle section exciting force bringing device；
310, columnar zone；320, isometric crystalline region, 330, center porosity hole.
Specific embodiment
For the content for further appreciating that the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.
Structure depicted in this specification attached drawing, ratio, size etc., only to cooperate the revealed content of specification,
So that those skilled in the art understands and reads, enforceable qualifications are not intended to limit the utility model, therefore are not had
Technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size, is not influencing the utility model
Under the effect of can be generated and the purpose that can reach, it should all still fall in the revealed technology contents of the utility model and obtain and can cover
In the range of.Meanwhile cited such as "upper", "lower", "left", "right", " centre " term in this specification, it is merely convenient to
Narration is illustrated, rather than to limit enforceable range, relativeness is altered or modified, in without substantive change technology
It holds, when being also considered as the enforceable scope of the utility model.
A kind of method of improvement continuous casting process solidification middle and later periods solid-liquid two-phase region mobility of the present embodiment, continuous casting billet 100
Outside be solidified shell 120, molten steel 110 is not solidified inside solidified shell 120, in the green shell of 100 solidification end of continuous casting billet
Surface applies intermittent exciting force, and wherein the slab cross section metal liquid fraction of 100 solidification end of continuous casting billet is b1, and 25%
≥b1>0, i.e. the exciting force of solidification end is applied to the section that Coagulated hemothorax is before 25% to metal liquid fraction；I.e. in continuous casting
100 metal liquid fraction of base is 25% >=b1>End exciting force bringing device 210 is provided at 0 position, end exciting force applies
Device 210 is used to apply intermittent exciting force, the exciting of end exciting force bringing device 210 to the green shell surface of solidification end
Power force direction is perpendicular to green shell surface.It requires exciting force to act on metal liquid fraction in slab cross section and is not more than 25%
Casting billet surface, such hammer vibration energy can play half solidification fluidity molten steel of raising with useful effect in the mushy zone of solidification end
Effect；When casting billet surface application of the metal liquid fraction greater than 25% acts in slab cross section, the zone of influence can be solidifying along slab
Solid portion will lead to the zone of influence because negative segregation occurs in sustained vibration to front transfer, simultaneously because vibration application position is excessively leaned on
Before, cause vibrating effect to be difficult to influence solidification end below, does not have the effect for improving slab central tissue.It is worth saying herein
Bright, the exciting force applied herein and vibration are entirely different, are described as follows：
(1) exciting force and the mode of action of vibration are entirely different, wherein intermittent exciting force is one way single to solidification end
The impact or percussion on the green shell surface at end, slab itself do not have relative displacement；And vibration is the reciprocal shaking to slab,
Slab itself may generate relative displacement, and vibrate that apply to casting blank shell surface is reciprocal active force, because around here
Having a rest property exciting force and vibration have the difference of essence；
(2) mechanism of action is entirely different, formally since exciting force and the mode of action of vibration are entirely different, while making two
Person is completely same to the mechanism of action of slab；The green shell surface for wherein solidifying middle section, which applies intermittent exciting force, to be passed through in moment
Solidified shell 120 is transmitted to slab core, makes half solidification molten steel under the action of shear stress, because positive thixotropy makes under viscosity
Drop and mobility improve, and improve half mobility for solidifying molten steel, improve half solidification molten steel in the feeding capacity of solidification middle and later periods；And
Vibration is to play feeding using inertia force and improve the loose problem of metal solidification texture, and vibration can additionally increase outfield force and draw
The molten steel and solidification front risen is interdendritic to continue relative displacement, promotes solute element in steel to shift into the liquid phase of steel, causes
The generation of slab negative segregation.
It is worth noting that：The excessive velocities of exciting force strike all transmit the strike effect of exciting force slowly excessively
It is bad.The time interval that the exciting force on solidification end green shell surface applies is t1, t1=0.0167~2s, so as to solidify
The exciting force of end green shell surface application rapid strike.Wherein the time interval of the exciting force application on solidification end green shell surface is
t1, t1=0.0167~2s, it is different in solidification end shell thickness as caused by slab size, to keep effect of vibration effective
It is transmitted to slab core, the time interval that exciting force applies is 0.0167~2s, good exciting force strike effect can be played, and
Exciting force is transmitted to slab core by green shell, makes half solidification molten steel under the action of shear stress, because positive thixotropy to glue
Degree decline and mobility improve, and then improve half feeding capacity for solidifying molten steel.
In addition, the impact energy range that the exciting force on solidification end green shell surface applies is W1, W1=15~1500J.In detail
Explanation is：The impact energy range that external force is described in detail is related with casting blank section with active position (metal liquid fraction), in continuous casting billet
The impact energy that the green shell surface of 100 solidification ends applies exciting force is W1,a1Value model
It encloses for 0.2~1.0J/mm3, b1For metal liquid fraction/% of the slab transversal cross-section of solidification end exciting force point of application position；C1
Value range is 2.7~3.3；S is casting blank section area/mm2；As metal liquid fraction is lower in slab, the bigger external force of section
Ballistic work it is bigger；In the exciting force of the appropriate impact energy of application on solidification end green shell surface, half solidification molten steel can be made to cut
Viscosity decline and mobility improve under the action of shearing stress, and then improve half solidification molten steel feeding capacity.
When the impact energy of exciting force is less than 15 joules, then slab mobility can not be effectively improved, it is difficult to it is solidifying to effectively improve half
Gu molten steel is in the feeding capacity of solidification middle and later periods；If the impact energy of exciting force is greater than 1500 joules, slab is easily caused
Surface quality problems.Furthermore this patent further includes exciting force generating system, which includes：Energy resource supply device, exciting force are applied
Feeder apparatus and excitation parameter regulation device, wherein exciting force producing method includes electromagnetic drive, motor driven, fluid driving etc..
In addition, technical research team finds by long-term research and development, solidification end electromagnetic agitating technology, solidification end pressure
Or rolling casting technology and with mechanical oscillation molding casting technique have the following problems：
It (1) is that the typical principle for applying outfield force technology is with electromagnetic agitation：To solidify by applying magnetic fields
The dendrite in forward position is broken off and is crushed, and partly solidifies molten steel using magnetic field force stirring mushy zone two-phase.But due in casting blank solidification
End, for molten steel temperature close to solidus, solid phase ratio is gradually high, and the mobility of molten steel deteriorates, and feeding capacity is weak, loose to continuous casting billet structure
It is difficult to play improvement, almost can not find in practice and stablize effective case.
(2) the main function principle of solidification end pressure or rolling casting technology is by the way that slab, solidified shell 120 applies
Half interstice coverage that solidification state molten steel squeezes out solidification cave and extrusion solidification is shunk is reduced continuous casting billet structure and dredged by the pressure of some strength
Pine.But the technology has the following disadvantages：Need to increase that huge slighter compress device, drafts are small is difficult to eliminate solidification end shape
At center porosity, biggish drafts is easy to crack in casting blank solidification forward position, solidifies to some crack sensitivity steel grades
Final position is difficult to position and be only applicable to the problems such as rectangular casting blank.
(3) mechanical oscillation molding placingJi Shu only has application report in small-sized molding ingot casting, and principle is by entire
The up-down vibration of platform is molded, the vibration of mold interior liquid metal is driven, feeding is played using inertia force and improves metal and coagulate
Gu the problem of tissue looseness.But the technology can not be used in continuous casting process, main reason is that：1, continuous casting installation for casting can not
Body vibration；2, continuous casting is a dynamic continuous production process, the static process with molding, and the two makes a big difference；3, phase
For small-sized molding ingot casting, the length dimension of continuous-cast blank is very big.
But but existing technique be difficult to effectively improve the loose problem of continuous casting billet structure so that the properties of steel
Deteriorate.And apply exciting force at the position that the slab cross section metal liquid fraction of 100 solidification end of continuous casting billet is 0~25%,
Exciting force is transmitted to slab core by green shell, makes half solidification molten steel under the action of shear stress, because positive thixotropy to glue
Degree decline and mobility improve, and under the conditions of molten steel high-head and solidification shrinkage are sucked by vacuum, half, which solidifies molten steel feeding capacity, increases
By force, thus using solid-liquid two-phase metal positive thixotropy, improve half mobility for solidifying molten steel, improve half solidification molten steel and solidifying
The feeding capacity of middle and later periods, improvement casting blank inner organization is loose, improves slab quality.
Embodiment 1
The present embodiment flows round billet continuous casting machine using certain factory 5, in the continuous casting process of different section round billet, in casting billet surface
One position is provided according to certain time interval using compressed air-driven using different time intervals, the bringing device of exciting force
The exciting force of certain impact function, each case are carried out continuously one and pour secondary test, and one piece of slab low power sample is taken after casting,
Loose grading is carried out, determine its porousness and is averaged, embodiment design parameter and the results are shown in Table 1.
The present embodiment applies exciting force in the point of application, and wherein the metal liquid fraction of the slab cross section at the point of application is respectively
23%, 15%, 15% and 11%, each experiment condition carries out one and pours secondary test, and slab low power sample one is taken after casting
Block, analyzes slab equiaxial crystal ratio and negative segregation situation, embodiment design parameter and the results are shown in Table 1.Wherein point of application metal
The pattern schematic diagram for the macrostructure that liquid fraction is 23% is as shown in Figure 2.
Comparative example 1
The basic content of this comparative example with embodiment 1, the difference is that, not to continuous casting billet during continuous casting
100 surfaces apply exciting force.One piece of slab low power sample is taken after casting, analyzes slab equiaxial crystal ratio and negative segregation situation, it is real
It applies a design parameter and the results are shown in Table 1.The pattern schematic diagram of the macrostructure of comparative example 1 is as shown in Figure 3.
Table 1
By the analysis to comparative example 1 and embodiment 1 it can be found that Fig. 2 is the pattern of the slab microstructure of embodiment 1
Schematic diagram；Fig. 3 is the pattern schematic diagram of the slab microstructure of comparative example 1；It include columnar zone 310, isometric crystalline region 320 in figure
With center porosity hole 330.Comparison discovery, using the isometric crystalline region 320 of slab after this patent with unused this patent and not just with outer
The isometric crystalline region 320 of slab of field force effect is compared, in metal liquid fraction 23%, 15%, 15%, 11%；Time interval difference
For：0.022,0.037,0.0625,0.1s；Ballistic work size is provided respectively：35,40,60,200/J；Center porosity grading detection
The case where obtaining above-mentioned center porosity, center porosity grading are respectively less than 0.5；And the center porosity of comparative example 1 is rated 1.0.
Embodiment 1 applies intermittent since exciting force strikes in casting billet surface green shell on the green shell surface of 100 solidification end of continuous casting billet
Exciting force, the slab cross section metal liquid fraction of 100 solidification end of continuous casting billet is 0~25%, and exciting force passes through green shell transmitting
To slab core, make half solidification molten steel under the action of shear stress, because positive thixotropy improves viscosity decline and mobility,
Under the conditions of molten steel high-head and solidification shrinkage are sucked by vacuum, half solidifies the enhancing of molten steel feeding capacity, to utilize solid-liquid two-phase
The positive thixotropy of metal improves half mobility for solidifying molten steel, improves half solidification molten steel in the feeding capacity of solidification middle and later periods, changes
Kind casting blank inner organization is loose, improves slab quality.
Embodiment 2
The basic content of the present embodiment with embodiment 1, the difference is that：In 100 solidification end of continuous casting billet and continuous casting billet
The green shell surface in 100 solidification middle sections applies intermittent exciting force respectively；And the green shell surface of 100 solidification end of continuous casting billet applies
The time interval of exciting force is less than the time interval that continuous casting billet 100 solidifies the green shell surface application exciting force in middle section；Wherein continuous casting
The slab cross section metal liquid fraction of 100 solidification end of base is b1, and 25% >=b1>0；The slab that continuous casting billet 100 solidifies middle section is horizontal
Cross section metal liquid fraction is b2, and 75% >=b2>25%.It is 25% >=b in 100 metal liquid fraction of continuous casting billet1>At 0 position
It is provided with end exciting force bringing device 210, end exciting force bringing device 210 is used to apply to the green shell surface of solidification end
Intermittent exciting force, the time interval that the exciting force of end exciting force bringing device 210 applies are 0.0167~2s, and vibration power is applied
The impact energy range added is 15~1500J.It is 75% >=b in 100 metal liquid fraction of continuous casting billet2>It is provided at 25% position
Middle section exciting force bringing device 220, middle section exciting force bringing device 220 are used to apply to the green shell surface in solidification middle section intermittent
Exciting force (as shown in Figure 4), the time interval that the exciting force of middle section exciting force bringing device 220 applies is 1-30s；Exciting force
The impact energy range of application is 10~800J.
It is worth noting that, the exciting force and vibrate completely not that solidification end applies are had been described that in embodiment 1 herein
Together, illustrate that the exciting force for solidifying middle section application and vibration are entirely different again herein, be described as follows：
(1) exciting force and the mode of action of vibration are entirely different, wherein intermittent exciting force is one way single to solidification end
The impact or percussion on the green shell surface at end, slab itself do not have relative displacement；And vibration is the reciprocal shaking to slab,
Slab itself may generate relative displacement, and vibrate that apply to casting blank shell surface is reciprocal active force, because around here
Having a rest property exciting force and vibration have the difference of essence；
(2) mechanism of action is entirely different, formally since exciting force and the mode of action of vibration are entirely different, exciting force impact
In casting billet surface green shell, the dendrite head that solidification front is grown in cooling procedure can be interrupted, column crystal is promoted to be converted into
Axialite, while will not additionally increase molten steel caused by outfield force and the interdendritic lasting relative displacement of solidification front, it is suppressed that steel
Middle solute element is shifted into the liquid phase of steel；And vibrate be played using inertia force feeding and improve metal solidification texture it is loose
Problem, molten steel caused by vibration meeting additionally increases outfield force simultaneously and the interdendritic lasting relative displacement of solidification front, promote in steel
Solute element is shifted into the liquid phase of steel, causes the generation of slab negative segregation.
Moreover, because the green shell surface in solidification end and solidification middle section applies the position of exciting force, ballistic work size respectively
With the difference of time interval so that solidification end and solidification middle section apply exciting force the mechanism of action it is also entirely different.
Continuous casting billet 100 includes slab concave arc side 101 and slab convex arc side 102, in the solidified shell 120 of continuous casting billet 100
Surface applies intermittent exciting force, and the metal liquid fraction of the slab cross section at the exciting force point of application is 25%~85%.
This is because metal liquid fraction is higher than, the green shell intensity solidified when 85% is inadequate, does not have and bears the outer of dendrite head that be effectively broken
The condition of power impact；Metal liquid fraction has been in solidification end when being lower than 25%, slab etc. can not be improved by continuing exciting
Axialite ratio.Apply exciting force in the slab concave arc side 101 of continuous casting billet 100 or slab convex arc side 102；Or in continuous casting billet
The corresponding position of the two sides of 100 slab concave arc sides 101 and slab convex arc side 102 applies exciting force.
Solidifying the time interval that middle section exciting force applies is 1-30s, this is because the effect of external force connects when the time is lower than 1s
Nearly continuous action causes molten steel and the interdendritic lasting relative displacement of solidification front, causes solute element constantly to liquid metal
Interior transfer, is easy to produce negative segregation, and fracture effect is also reduced because dendrite has little time growth；When time is greater than 30s, dendritic growth
Length it is too long, fracture dendrite head it is few, it is inadequate to column crystal inhibitory effect.The time interval is related with position shell thickness,
Dendritic growth is fast when green shell is thin, and exciting interval wants short, and specifically available following relationship indicates：The green shell surface for solidifying middle section applies
The time interval of exciting force is t2, t2=ε × b2 τ× S, ε value range are 0.4~0.8s/mm2；b2For continuous casting at active position
Metal solid rate/% in 100 transversal cross-section of base；τ value range is 1.4~2.0；S is casting blank section area/mm2。
Solidifying the impact energy range that middle section exciting force applies is 10~800J.Specific value and shell thickness (metal liquid phase
Rate) etc. factors it is related, specifically available following relationship indicates：Apply exciting force on the green shell surface that continuous casting billet 100 solidifies middle section
Impact energy be W2,a2Value range is 0.2~2.6J/mm3, b2Swash for solidification middle section
Metal liquid fraction/% of the slab transversal cross-section of vibration power point of application position；C2Value range is 1.8~2.4；S is casting blank section
Area/mm2。
Along 100 liquidus curve length direction of continuous casting billet, the surface of the solidified shell 120 in middle section is solidified extremely in continuous casting billet 100
1 group of middle section exciting force bringing device 220 is set less, middle section exciting force bringing device 220 is used to apply exciting force to solidification middle section,
The present embodiment slab concave arc side 101 is provided with 1 middle section exciting force bringing device 220, and 210 He of end exciting force bringing device
Middle section exciting force bringing device 220 is set to the same side of continuous casting billet 100,210 He of the present embodiment end exciting force bringing device
Middle section exciting force bringing device 220 is set to slab concave arc side 101.Applied in a metal liquid fraction position of continuous casting billet 100
The corresponding position of the unilateral exciting force or two sides that add at the same apply exciting force be 1 group of exciting force；In the difference of continuous casting billet 100
Multiple exciting forces that metal liquid fraction position applies, then be multiple groups exciting force.It simultaneously can be along 100 liquid phase line length of continuous casting billet
The point of application of multiple exciting forces is arranged on the surface of the solidified shell 120 of continuous casting billet 100 in direction.
The present embodiment flows round billet continuous casting machine using certain factory 5, and slab diameter is 380mm between casting billet surface is using different time
It is every the bringing device of, exciting force, and in 100 solidification end liquid fraction of continuous casting billet：23% position applies exciting force, the position
Exciting force time interval be 0.022s, solidification end ballistic work be 35J；Continuous casting billet 100 solidify middle section liquid fraction be：
75%, time interval 3s, solidification end ballistic work are 20J.One piece of slab low power sample is taken after casting, detects equiax crystal
Rate carries out loose grading, determines its porousness and is averaged, 2 design parameter of embodiment and the results are shown in Table 2, low power
The pattern schematic diagram of tissue is as shown in Figure 6.
Comparative example 2
The basic content of this comparative example 2 with embodiment 2, the difference is that：Continuous casting process does not apply other measures.Casting
After take one piece of slab low power sample, detection equiaxial crystal ratio carries out loose grading, determines its porousness and is averaged, right
2 design parameter of ratio and the results are shown in Table 2.
Embodiment 3
The basic content of the present embodiment with embodiment 2, the difference is that：Slab diameter is 380mm, and continuous casting billet 100 is solidifying
Gu the two sides in middle section are correspondingly arranged on middle section exciting force bringing device 220, and the middle section exciting force bringing device 220 of two sides is sharp
Power force direction of shaking is conllinear, and the force direction of middle section exciting force bringing device 220 passes through in the geometry of 100 cross section of continuous casting billet
The heart, the present embodiment are round billet, then the big beating position of exciting force passes through the center of circle of slab cross section；I.e. on slab two sides surface
One point of application position applies exciting force simultaneously, using uniform impingement function symmetric shock, and the present embodiment is in the solidification of continuous casting billet 100
The corresponding position of the two sides of section slab concave arc side 101 and slab convex arc side 102 applies identical exciting force (such as Fig. 5 institute simultaneously
Show).
And the application position of exciting force in 100 solidification end of continuous casting billet and solidification middle section, time interval and ballistic work it is big
It is small different.One piece of slab low power sample is taken after casting, detection equiaxial crystal ratio carries out loose grading, determines its loose journey
It spends and is averaged, embodiment design parameter and the results are shown in Table 2.
Table 2
By table 2 it can be found that being applied respectively on the green shell surface that 100 solidification end of continuous casting billet and continuous casting billet 100 solidify middle section
After adding intermittent exciting force, the equiaxial crystal ratio of embodiment 2 and embodiment 3 is respectively increased to 55% or more, and center porosity is commented
The phenomenon that grade is 0, and when improving slab quality, does not generate any negative segregation.Compared to comparative example 1, embodiment 2 and implementation
The quality of example 3 is improved significantly.
In addition, comparison diagram 3 and Fig. 6, the green shell surface in continuous casting billet solidifying end and solidification middle section applies intermittent respectively
After exciting force, not only the ratio of isometric crystalline region 320 is expanded, but also it is loose to reduce casting blank inner organization.This is because even
The green shell surface in casting blank solidification end and solidification middle section applies intermittent exciting force respectively, and strike is in the solidification of continuous casting billet 100
The exciting force on the green shell surface of section can regularly interrupt the dendrite head that solidification front is grown in cooling procedure, so that column
Crystalline substance is converted into the process of equiax crystal, promotes the growth of equiax crystal；And the green shell in 100 solidification end of continuous casting billet is being hit in strike
The exciting force on surface improves feeding capacity of the half solidification molten steel in the solidification middle and later periods using the positive thixotropy of solid-liquid two-phase metal,
The feeding capacity for improving half solidification molten steel while the production of equiax crystal in the solidification middle and later periods is improved, improves casting blank inner organization and dredges
Pine improves slab quality；Middle section is solidified using exciting force generating system to slab certain position, every a timing in slab 100
Between, the method that instantaneously strikes casting billet surface green shell with the external force of some strength, so that exciting force is transmitted to casting blank solidification by green shell
Forward position, the dendrite head for the solidification front growth that is periodically broken, while inhibiting column crystals growth, for after the equiax crystal of center
Continuous formed provides nucleus core.
The utility model is described in detail above in conjunction with specific exemplary embodiment.It is understood, however, that can be
It is carry out various modifications in the case where not departing from the scope of the utility model being defined by the following claims and modification.It is detailed to retouch
State should be to be considered only as with attached drawing it is illustrative and not restrictive, if there is any such modifications and variations, then
They fall in the scope of the utility model described herein.In addition, background technique is intended to grinding in order to illustrate this technology
It was found that shape and meaning, it is no intended to limit the application field of the utility model or the application and the utility model.
Claims (8)
1. the control device of slab quality during a kind of continuous casting and solidifying, it is characterised in that：In continuous casting billet (100) metal liquid fraction
For 25% >=b1>It is provided with end exciting force bringing device (210) at 0 position, and is in continuous casting billet (100) metal liquid fraction
75% >=b2>Be provided with middle section exciting force bringing device (220) at 25% position, end exciting force bringing device (210) and
Middle section exciting force bringing device (220) is respectively used to apply intermittent exciting force to green shell surface.
2. the control device of slab quality during a kind of continuous casting and solidifying according to claim 1, it is characterised in that：Continuous casting
The two sides in base (100) solidification middle section are correspondingly arranged on middle section exciting force bringing device (220).
3. the control device of slab quality during a kind of continuous casting and solidifying according to claim 2, it is characterised in that：Continuous casting
The exciting force force direction of the middle section exciting force bringing device (220) of base (100) two sides is conllinear.
4. the control device of slab quality, feature during a kind of continuous casting and solidifying according to claim 1-3
It is：The time interval that the exciting force of end exciting force bringing device (210) applies is 0.0167~2s.
5. the control device of slab quality, feature during a kind of continuous casting and solidifying according to claim 1-3
It is：The time interval that the exciting force of middle section exciting force bringing device (220) applies is 1-30s.
6. a kind of control device for improving continuous casting process solidification middle and later periods solid-liquid two-phase region mobility, it is characterised in that：In continuous casting
Base (100) metal liquid fraction is 25% >=b1>End exciting force bringing device (210), end exciting force are provided at 0 position
Bringing device (210) is used to apply intermittent exciting force to the green shell surface of solidification end.
7. a kind of control dress for improving continuous casting process solidification middle and later periods solid-liquid two-phase region mobility according to claim 6
It sets, it is characterised in that：The exciting force force direction of end exciting force bringing device (210) is perpendicular to green shell surface.
8. a kind of control dress for improving continuous casting process solidification middle and later periods solid-liquid two-phase region mobility according to claim 6
It sets, it is characterised in that：The time interval that the exciting force of end exciting force bringing device (210) applies is 0.0167~2s.
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| CN201820433490.8U CN208116707U (en) | 2018-03-29 | 2018-03-29 | Slab quality and improve the control device of middle and later periods solid-liquid two-phase region mobility during a kind of continuous casting and solidifying |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108526423A (en) * | 2018-03-29 | 2018-09-14 | 马鞍山钢铁股份有限公司 | A kind of method, control method and device of slab quality improving casting process solidification middle and later periods solid-liquid two-phase region mobility |
| CN110548845A (en) * | 2019-09-30 | 2019-12-10 | 中达连铸技术国家工程研究中心有限责任公司 | Continuous casting rotary supporting roller with vibrating piece |
-
2018
- 2018-03-29 CN CN201820433490.8U patent/CN208116707U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108526423A (en) * | 2018-03-29 | 2018-09-14 | 马鞍山钢铁股份有限公司 | A kind of method, control method and device of slab quality improving casting process solidification middle and later periods solid-liquid two-phase region mobility |
| WO2019184729A1 (en) * | 2018-03-29 | 2019-10-03 | 马鞍山钢铁股份有限公司 | Method for improving fluidity of solid-liquid two-phase region in middle and late solidification stages of continuous casting process, and method and device for controlling quality of cast ingot |
| CN110548845A (en) * | 2019-09-30 | 2019-12-10 | 中达连铸技术国家工程研究中心有限责任公司 | Continuous casting rotary supporting roller with vibrating piece |
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