CN108500226A - A kind of continuous casting and solidifying course control method for use inhibiting column crystals growth - Google Patents
A kind of continuous casting and solidifying course control method for use inhibiting column crystals growth Download PDFInfo
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- CN108500226A CN108500226A CN201810268562.2A CN201810268562A CN108500226A CN 108500226 A CN108500226 A CN 108500226A CN 201810268562 A CN201810268562 A CN 201810268562A CN 108500226 A CN108500226 A CN 108500226A
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
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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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
- B22D11/207—Controlling or regulating processes or operations for removing cast stock responsive to thickness of solidified shell
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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
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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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Abstract
The invention discloses a kind of continuous casting and solidifying course control method for use inhibiting column crystals growth, belong to metallurgical continuous casting technical field.The present invention applies intermittent exciting force on the surface of continuous casting billet solidified shell, and metal liquid fraction is 25%~85% in the strand cross section at the exciting force point of application.The exciting force of the present invention strikes 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 equiax crystal, molten steel caused by will not additionally increasing outfield force simultaneously and the interdendritic lasting relative displacement of solidification front, solute element in steel is inhibited to be shifted into molten steel, to which while inhibiting column crystals growth, promoting isometric crystals growth, the generation of strand negative segregation can be avoid or reduced.
Description
Technical field
The present invention relates to metallurgical continuous casting technical fields, solidifying more specifically to a kind of continuous casting inhibiting column crystals growth
Gu course control method for use.
Background technology
In continuous casting of iron and steel production process, to improve the consolidated structure of strand, equiaxial crystal ratio is improved, reduces strand center
The loose and component segregation in domain, it is widely used that outfield force stirring technique is applied to be typical with electromagnetic agitation.Electromagnetic agitating technology
Using electromagnetic induction principle, induced current is generated inside continuous casting billet, this electric current generates electromagnetic force with magnetic field interaction, makes gold
Belong to liquid and generate unidirectional rotational flow and the dendrite that fractures, broken crystal is promoted to generate the nucleus of more equiax crystal, to
Reach the growth for inhibiting the continuous casting billet dendrite in process of setting, while having expanded equiaxial crystal ratio, as a result improves slab quality.
But use such method due to persistently applying constant or alternating electromagnetic force to liquid metal, in the disconnected column crystal of brush
While dendrite head becomes Center Equiaxial Crystal nucleus, also so that opposite transport persistently occurs for the dendrite of liquid metal and solidification front
It is dynamic, that is, liquid metal constantly washing away to solidification front, it causes solute element constantly to be shifted into liquid metal, causes to hold
Serious macroscopical negative segregation inside continuous outfield force zone of action strand, such as the strand white band in continuous casting steel machine.Usually, such as
There is negative segregation band in fruit, often accordingly inevitably also will appear normal segregation band.
Through retrieval, innovation and creation it is entitled：A kind of the vibration hammer device and application method (application number of continuous casting billet：
201310412579.8 the applying date：2013.09.11), more particularly to the vibration hammer device and application method of a kind of continuous casting billet.
The vibration hammer device of the continuous casting billet, including tup, moving lever, fixed handle sturcture and power-driven system, wherein Gu
Determine the middle and later periods region that handle sturcture is fixed on casting blank solidification, the tup for being located at relative direction is mounted on fixed handle by moving lever
The surface held in mechanism and with strand is spaced apart, and moving lever is connected with power-driven system.Due to taking hammering
Mode replaces contact to vibrate, and in green shell thicker solidification latter stage, the effect that vibrations are passed into strand core is more preferable, is conducive to brokenly
Broken and refinement Center Equiaxial Crystal, is effectively improved strand central pipe and loose；It avoids caused by solidification end casting simultaneously
The generation of rolling crack.
Invention content
1. technical problems to be solved by the inivention
It is an object of the invention to improve the slab quality in casting process, a kind of continuous casting inhibiting column crystals growth is provided
Solidification process control method applies intermittent exciting force, and the casting at the exciting force point of application on the surface of casting blank solidification green shell
Metal liquid fraction is 25%~85% in base cross section；The exciting force in casting billet surface green shell is struck, can regularly be interrupted
The dendrite head that solidification front is grown in cooling procedure, and then the growth of equiax crystal can be promoted, while can avoid or reduce
The generation of strand negative segregation.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention is：
The continuous casting and solidifying course control method for use of a kind of inhibition column crystals growth of the present invention, in the solidified shell of continuous casting billet
Surface applies intermittent exciting force, and metal liquid fraction is 25%~85% in the strand cross section at the exciting force point of application.
The exciting force of the present invention strikes in casting billet surface green shell, can interrupt the dendrite head that solidification front is grown in cooling procedure, promotees
Column crystal is set to be converted into equiax crystal, while molten steel caused by will not additionally increasing outfield force and solidification front are interdendritic lasting
Relative displacement, it is suppressed that solute element is shifted into the liquid phase of steel in steel, inhibits column crystals growth and promotion isometric to reach
Crystals growth purpose.
Preferably, the time interval that exciting force applies is 1-30 seconds.
Preferably, impact energy ranging from 10~800J that exciting force applies.
Preferably, the time interval that exciting force applies is T, T=ε × bτ× S, ε value range are 0.4~0.8s/mm2；b
For metal solid rate/% in continuous casting billet lateral cross section at active position；The value of continuous casting of iron and steel process factor τ is 1.4~2.0,
The value of coefficient τ is 1.0~1.6 during copper continuous casting；S is casting blank section area/mm2。
Preferably, impact energy ranging from W, W=a × (1-b) that exciting force appliesC×S1.5, a value ranges be 0.2~
2.6J/mm3, b is the metal liquid fraction/% for the strand lateral cross section for solidifying stage casing exciting force point of application position；Continuous casting of iron and steel mistake
The value of journey C is 1.8~2.4, and the value of C is 1.0~1.6 during copper continuous casting；S is casting blank section area/mm2。
Preferably, apply exciting force in the corresponding two sides of continuous casting billet.
Preferably, apply identical exciting force simultaneously in the corresponding position of continuous casting billet both sides.
Preferably, along continuous casting billet liquidus curve length direction, at least it is arranged 1 group on the surface of the solidified shell of continuous casting billet and swashs
The point of application for power of shaking.
3. advantageous effect
Using technical solution provided by the invention, compared with existing known technology, there is following remarkable result：
(1) the continuous casting and solidifying course control method for use of a kind of inhibition column crystals growth of the invention, in casting blank solidification green shell
Surface applies intermittent exciting force, and metal liquid fraction is 25%~85% in the strand cross section at the exciting force point of application；
Exciting force strikes in casting billet surface green shell, can regularly interrupt the dendrite head that solidification front is grown in cooling procedure, quilt
The dendrite head interrupted falls in molten steel and is formed equiax crystal, is the process that column crystal is converted into equiax crystal, while will not additionally increase
Molten steel caused by adding outfield force and the interdendritic lasting relative displacement of solidification front, it is suppressed that liquid phase of the solute element to steel in steel
Middle transfer, to which while inhibiting column crystals growth, promoting isometric crystals growth, strand negative segregation can be avoid or reduced
It generates；
(2) the continuous casting and solidifying course control method for use of a kind of inhibition column crystals growth of the invention, at the exciting force point of application
Metal liquid fraction is 25%~85% in strand cross section so that solidified shell, can be with while can bear strike exciting force
The dendrite head that solidification front is grown is interrupted, and promotes the growth of equiax crystal；
(3) the continuous casting and solidifying course control method for use of a kind of inhibition column crystals growth of the invention, the time that exciting force applies
Between be divided into T, T=ε × στThe range of × S, ε are 0.4~0.8s/mm2, σ is the metal in strand lateral cross section at active position
Solid rate, continuous casting of iron and steel process factor τ, S are casting blank section area/mm2；It can be according to the practical need in continuous casting production process
It wants, adjusts the time interval that exciting force applies, molten steel caused by avoid excitation force frequency excessively high and solidification front interdendritic
Lasting relative displacement so that solute element is constantly shifted into liquid metal；Between the time that can also avoid exciting force application
Every long so that the length of dendritic growth is long, and fracture dendrite head is few, inadequate to column crystal inhibition；
(4) the continuous casting and solidifying course control method for use of a kind of inhibition column crystals growth of the invention, the impact that exciting force applies
Energy range is W, W=a × (1-b)C×S1.5, the range of coefficient a is 0.2~2.6J/mm3, b is strand transverse cutting at active position
Metal liquid fraction in face, S are casting blank section area/mm2；So as to apply suitable impact energy according to thickness, can keep away
Exempt from green shell deformation and applies low energy exciting force, and the dendrite head that can effectively be broken, and then the dendrite head that solidification front is grown
It is interrupted, and promotes the growth of equiax crystal, while the generation of strand negative segregation can be avoid or reduced.
Description of the drawings
Fig. 1 is a kind of continuous casting and solidifying process control equipment schematic diagram of inhibition column crystals growth of the present invention；
Fig. 2 is the pattern schematic diagram of the strand microstructure of embodiment 1；
Fig. 3 is the pattern schematic diagram of the strand microstructure of comparative example 1.
Label declaration in schematic diagram：
100, continuous casting billet；110, molten steel is not solidified；120, solidified shell；101, strand concave arc side；102, strand convex arc side；
200, exciting force bringing device；
310, columnar zone；320, isometric crystalline region.
Specific implementation mode
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Structure, ratio, size depicted in this specification attached drawing etc., only to coordinate the revealed content of specification,
So that those skilled in the art understands and reads, the enforceable qualifications of the present invention are not limited to, therefore do not have technology
On essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size can be generated not influencing the present invention
The effect of and the purpose that can reach under, should all still fall in the range of disclosed technology contents obtain and can cover.Together
When, cited such as "upper", "lower", "left", "right", " centre " term in this specification are merely convenient to the clear of narration,
Rather than to limit enforceable range, relativeness is altered or modified, in the case where changing technology contents without essence, when also regarding
For the enforceable scope of the present invention.
The present invention is in continuous casting of iron and steel production process, using exciting force generating system to strand certain position, Mei Geyi
The method fixed time, instantaneously strike casting billet surface green shell with the external force of some strength makes exciting force pass through green shell and is transmitted to strand
Solidification front, periodically be broken solidification front growth dendrite head, while inhibiting column crystals growth, centered on equiax crystal
Be subsequently formed nucleus core be provided, while molten steel caused by will not additionally increasing outfield force and solidification front are interdendritic lasting
Relative displacement, it is suppressed that solute element is shifted into the liquid phase of steel in steel, can avoid or reduce the generation of strand negative segregation.
The continuous casting billet 100 of the present invention includes strand concave arc side 101, strand convex arc side 102 and side, continuous casting billet 100 it is outer
Portion is solidified shell 120, and 120 inside of solidified shell is not solidify molten steel 110；A kind of company of inhibition column crystals growth of the present invention
Solidification process control method is cast, applies intermittent exciting force, and exciting force on the surface of the solidified shell 120 of continuous casting billet 100
Metal liquid fraction is 25%~85% in strand cross section at the point of application, is 75% >=b in 100 metal liquid fraction of continuous casting billet2>
Exciting force bringing device 200 is provided at 25% position, exciting force bringing device 200 to 120 surface of solidified shell for applying
Add intermittent exciting force (as shown in Figure 1), the force direction of exciting force is perpendicular to the green shell surface of continuous casting billet 100, the exciting
Force is the hitting power that one-way intermittent applies or two-way intermittent while application hitting power.This is because molten metal
One after another is higher than the green shell insufficient strength solidified when 85%, does not have the condition of the external force impact for the dendrite head that bears effectively to be broken；
Metal liquid fraction has been in solidification end when being less than 25%, and strand equiax crystal ratio can not be improved by continuing to exciting force
Example.Apply exciting force in the strand concave arc side 101 of continuous casting billet 100 or strand convex arc side 102, you can with applying exciting force
Position is added to be set to strand concave arc side 101 or strand convex arc side 102；The installation position of certain exciting force can also be located at continuous casting
At each position in side of base 100；Or pair in 100 strand concave arc side 101 of continuous casting billet and the two sides of strand convex arc side 102
Position is answered to apply exciting force.Corresponding position in 100 strand concave arc side 101 of continuous casting billet and the two sides of strand convex arc side 102 is same
When apply identical exciting force.
Along 100 liquidus curve length direction of continuous casting billet, at least it is arranged 1 group on the surface of the solidified shell 120 of continuous casting billet 100
The point of application of exciting force, i.e., the unilateral exciting force applied in a metal liquid fraction position of continuous casting billet 100 or two sides
It is 1 group of exciting force that corresponding position applies exciting force simultaneously；Apply in the different metal liquid fraction position of continuous casting billet 100 multiple sharp
It shakes power, is then multigroup exciting force.It can be along 100 liquidus curve length direction of continuous casting billet, in the solidified shell 120 of continuous casting billet 100
Surface the point of applications of multiple exciting forces is set, and metal liquid fraction differs in the strand cross section at each point of application.
The exciting force of application described herein as with it is entirely different with the vibration in simple meaning, be described as follows：
(1) exciting force and the mode of action of vibration are entirely different, wherein intermittent exciting force is that one way single is last to solidification
The impact or percussion on the green shell surface at end, strand itself do not have relative displacement；And vibration is the reciprocal shaking to strand
Or movement, strand itself may will produce relative displacement, and vibrate that apply to casting blank shell surface is reciprocal active force,
Therefore intermittent exciting force has the difference of essence with vibration；
(2) mechanism of action is entirely different, entirely different just because of exciting force and the mode of action of vibration, 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, at the same molten steel caused by will not additionally increasing outfield force with solidification front is interdendritic continues relative displacement, it is suppressed that steel
Middle solute element is shifted into the liquid phase of steel；And vibrate be using inertia force play 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 strand negative segregation.
Therefore, exciting force and the action principle of vibration, the effect reached, the mechanism of action are entirely different.
The time interval that exciting force applies is 1-30 seconds, this is because when the time is less than 1 second, the effect of external force is close to continuously
Effect causes molten steel and the interdendritic lasting relative displacement of solidification front, solute element is caused constantly to be shifted into liquid metal,
Negative segregation is easy tod produce, fracture effect is also reduced because dendrite has little time growth；Exciting force time interval is too greatly so that dendrite life
Long length is long, and fracture dendrite head is few, inadequate to column crystal inhibition.It is worth noting that, time interval and position
Shell thickness is related, and dendritic growth is fast when green shell is thin, and exciting interval wants short, and specifically available following relationship indicates：T=ε × στ
× S, wherein T are time interval/s, and the range of coefficient ε is 0.4~0.8s/mm2, impact energy, the work of concrete numerical value and external force
Related with a distribution, quantity, σ is the metal solid rate in strand lateral cross section at active position, continuous casting of iron and steel process factor τ's
Value is 1.4~2.0, and the value of coefficient τ is 1.0~1.6 during copper continuous casting, the springform of concrete numerical value and different metal material
Amount, intensity and pulling speed of continuous casting are related with section configuration, and S is casting blank section area/mm2。
Impact energy ranging from 10~800J that exciting force applies.The specific factors such as value and shell thickness (metal liquid fraction)
Related, specifically available following relationship indicates：W=a × (1-b)C×S1.5, wherein W is impact energy/J of external force, the model of coefficient a
It is 0.2~2.6J/mm to enclose3, concrete numerical value is distributed with exciting point of force application and quantity is related, and b is that strand is horizontal at active position
The value of metal liquid fraction into section, continuous casting of iron and steel process C is 1.8~2.4, and the value of C is 1.0~1.6 during copper continuous casting,
Its concrete numerical value is related with the elasticity modulus of different metal material, intensity and conticaster section configuration, and S is casting blank section face
Product/mm2.When thickness is smaller, the exciting force of appropriate energy can effectively be broken dendrite head while avoiding green shell from deforming；When
When thickness is big, the exciting force of appropriate energy can penetrate green shell surface, to the dendrite head that is effectively broken so that exciting force is to even
When strand 100 is hit, the dendrite head that solidification front is grown in cooling procedure can be regularly interrupted, the dendrite head being interrupted is fallen
In molten steel and form equiax crystal, at the same molten steel caused by will not additionally increasing outfield force with solidification front is interdendritic continues phase
To displacement, it is suppressed that solute element is shifted into the liquid phase of steel in steel, to inhibit column crystals growth, promote isometric crystals growth
While, the generation of strand negative segregation can be avoid or reduced.
Embodiment 1
The present embodiment flows round billet continuous casting machine using certain factory 5, and in the casting process of high-carbon steel round blank, wherein casting blank section is
A diameter of 380mm applies exciting force in the point of application of the medial surface of continuous casting billet 100, which is to be driven using compressed gas
Dynamic device applies intermittent impact force to the medial surface of continuous casting billet 100, i.e. strand concave arc side 101 applies intermittent impact
Power.
The present embodiment applies exciting force in the point of application, and metal liquid fraction is respectively in the strand cross section wherein at the point of application
75%, casting terminates post analysis strand equiaxial crystal ratio and negative segregation situation, embodiment design parameter and the results are shown in Table 1.Its
The pattern schematic diagram for the macrostructure that middle exciting force point of application metal liquid fraction is 75% is as shown in Figure 2.
Table 1
Comparative example 1
The substance of this comparative example with embodiment 1, the difference is that, not to continuous casting billet during continuous casting
100 surfaces apply exciting force.Casting terminates post analysis strand equiaxial crystal ratio and negative segregation situation, 1 design parameter of comparative example and knot
Fruit is as shown in table 1.The pattern schematic diagram of the macrostructure of comparative example 1 is as shown in Figure 3.
By the analysis to comparative example 1 and embodiment 1 it can be found that Fig. 2 is the pattern of the strand microstructure of embodiment 1
Schematic diagram；Fig. 3 is the pattern schematic diagram of the strand microstructure of comparative example 1；Figure includes columnar zone 310 and isometric crystalline region
320.From the comparison of Fig. 2 and Fig. 3, it has also been discovered that, the strand of embodiment 1 is not in the case where generating negative segregation, hence it is evident that improve etc.
Axialite rate, it is with obvious effects.The equiaxial crystal ratio of embodiment is 58.5%, is far longer than the equiaxial crystal ratio of comparative example 38.2%.Implement
Example 1 since exciting force strikes in casting billet surface green shell, can with moment by the energy transmission of exciting force to casting billet surface, and edge
It green shell and is transmitted to casting blank solidification forward position, exciting force can regularly interrupt the dendrite that solidification front is grown in cooling procedure
Head, and then effectively inhibit column crystals growth；At the same time, the dendrite head being interrupted falls in molten steel and is formed equiax crystal, is
Center Equiaxial Crystal is subsequently formed offer nucleus so that column crystal is converted into equiax crystal.
Since exciting force is the regular momentary action of interruption, molten steel and solidification front interdendritic it is no continue opposite position
It moves, solute element will not be caused to be shifted into liquid metal and cause strand negative segregation, and exciting force is to column crystal dendrite head
Fracture ability be much higher than electromagnetic force.And then the growth of equiax crystal is promoted, while strand negative bias can be avoid or reduced
The generation of analysis.
Embodiment 2
The present embodiment flows round billet continuous casting machine using certain factory 5, and in the casting process of high-carbon steel round blank, wherein casting blank section is
A diameter of 700mm, in the strand concave arc side 101 of continuous casting billet 100, the different point of applications applies exciting force, which is to use
Compressed gas-driven device applies intermittent impact force to the medial surface of continuous casting billet 100.
The present embodiment molten metal in two different point of applications application exciting forces, the strand cross section wherein at the point of application
One after another is respectively 45% and 40%, and casting terminates post analysis strand equiaxial crystal ratio and negative segregation situation, 2 design parameter of embodiment and
The results are shown in Table 2.
Table 2
Comparative example 2
The substance of this comparative example with embodiment 2, the difference is that, not to continuous casting billet during continuous casting
100 surfaces apply exciting force.Casting terminates post analysis strand equiaxial crystal ratio and negative segregation situation, 2 design parameter of comparative example and knot
Fruit is as shown in table 2.
By the analysis to comparative example 2 and embodiment 2 it can be found that the equiaxial crystal ratio of embodiment 2 is 62.1%, much greatly
In the equiaxial crystal ratio of comparative example 45.6%.The present embodiment not only applies exciting force on continuous casting billet 100, but also is applied in a different
Force applies exciting force simultaneously, realizes the exciting force impact of multisection type；Exciting force strikes in casting billet surface green shell, and moment will
The energy transmission of exciting force is transmitted to casting blank solidification forward position to casting billet surface, and along green shell, and exciting force not only can regularity
Ground interrupts the dendrite head of solidification front growth, and the action time of two positions and effect have certain difference, Ke Yichong
Divide and the dendrite head smashed is promoted to fall in molten steel, and form uniform forming core core, promotes the growth of equiax crystal.
Embodiment 3
The substance of the present embodiment with embodiment 1, the difference is that：It is tried on certain steel mill's slab caster
Test, in the casting process of 2150 × 230 section slabs, strand two sides surface a point of application position simultaneously, use
Uniform impingement work(symmetric shock applies exciting force, the i.e. both sides in 100 strand concave arc side 101 and strand convex arc side 102 of continuous casting billet
The corresponding position in face applies identical exciting force simultaneously.The present embodiment has carried out 2 groups of experiments, and in identical casting blank section condition
Under, it is tested respectively in different exciting force active positions, exciting force active position, action time interval and the offer of every group of experiment
Ballistic work size is as shown in table 3.Casting terminates post analysis strand equiaxial crystal ratio and negative segregation situation, embodiment design parameter and knot
Fruit is as shown in table 3.
Comparative example 3
The substance of this comparative example with embodiment 3, the difference is that, not to continuous casting billet during continuous casting
100 surfaces apply exciting force.Casting terminates post analysis strand equiaxial crystal ratio and negative segregation situation, 3 design parameter of comparative example and knot
Fruit is as shown in table 3.
Table 3
The implementation of scheme through the invention it can be seen from result of implementation is not generating negative bias using the strand of the present invention
In the case of analysis, hence it is evident that equiaxial crystal ratio is improved, it is with obvious effects.By the analysis to comparative example 3 and embodiment 3 it can be found that reality
The equiaxial crystal ratio for applying example 3 is all higher than 35.7%, is much larger than the equiaxial crystal ratio of comparative example 23.1%.The present embodiment is not only in continuous casting
Apply exciting force on base 100, and a point of application position on strand two sides surface simultaneously, use uniform impingement work(pair
Claim impact to apply exciting force, realize same position both sides while applying exciting force, the exciting force that both sides apply simultaneously promotes
Ability is transferred to solidification front by exciting force rapidly, and the exciting force that both sides apply simultaneously promotes the rupture of dendrite head and beats
It is broken, the dendrite head smashed can be sufficiently promoted and fallen in molten steel, and form uniform forming core core, promote the life of equiax crystal
It is long.
Embodiment 4
The substance of the present embodiment with embodiment 1, the difference is that：It is tried on certain steel mill's slab caster
It tests, in the casting process of 2150 × 230 section slabs, applies exciting force, experiment in the strand convex arc side 102 of continuous casting billet 100
Exciting force active position, action time interval and provide ballistic work size it is as shown in table 4.It is isometric that casting terminates post analysis strand
Brilliant rate and negative segregation situation, embodiment design parameter and the results are shown in Table 4.
Table 4
The strand convex arc side 102 of the present embodiment continuous casting billet 100 applies exciting force, promotes exciting force and rapidly transmits ability
It to solidification front, promotes the rupture of dendrite head and smashes, broken dendrite head can be promoted uniformly to fall in molten steel, and
Uniform forming core core is formed, the growth of equiax crystal is promoted.
Embodiment 5
The substance of the present embodiment with embodiment 1, the difference is that：It is tried on certain steel mill's slab caster
It tests, in the casting process of 2150 × 230 section slabs, applies exciting force in the side of continuous casting billet 100, side is non-strand
The position of concave arc side 101 or strand convex arc side 102, exciting force active position, action time interval and the offer impact of experiment
Work(size is as shown in table 5.Casting terminates post analysis strand equiaxial crystal ratio and negative segregation situation, embodiment design parameter and result
As shown in table 5.
Table 5
The side of the present embodiment continuous casting billet 100 applies exciting force, promotes before ability is transferred to solidification by exciting force rapidly
Edge, exciting force promote the rupture of dendrite head and smash, and can sufficiently promote the dendrite head smashed and fall in molten steel, and are formed equal
Even forming core core, promotes the growth of equiax crystal.
The present invention is described in detail above in conjunction with specific exemplary embodiment.It is understood, however, that can not take off
It is carry out various modifications in the case of from the scope of the present invention being defined by the following claims and modification.Detailed description and drawings
Should be to be considered only as it is illustrative and not restrictive, if there is any such modifications and variations, then they all will
It falls into the scope of the present invention described here.In addition, background technology is intended to Development Status and meaning in order to illustrate this technology,
It is not intended to limit the application field of the present invention or the application and the present invention.
Claims (8)
1. a kind of continuous casting and solidifying course control method for use inhibiting column crystals growth, it is characterised in that：Solidification in continuous casting billet (100)
The surface of green shell applies intermittent exciting force, and in the strand cross section at the exciting force point of application metal liquid fraction be 25%~
85%.
2. a kind of continuous casting and solidifying course control method for use inhibiting column crystals growth according to claim 1, it is characterised in that：
The time interval that exciting force applies is 1-30 seconds.
3. a kind of continuous casting and solidifying course control method for use inhibiting column crystals growth according to claim 1, it is characterised in that：
Impact energy ranging from 10~800J that exciting force applies.
4. a kind of continuous casting and solidifying course control method for use inhibiting column crystals growth according to claim 1, it is characterised in that：
The time interval that exciting force applies is T, T=ε × bτ× S,
ε value ranges are 0.4~0.8s/mm2；
B is metal solid rate/% in continuous casting billet (100) lateral cross section at active position；
The value of continuous casting of iron and steel process factor τ is 1.4~2.0, and the value of coefficient τ is 1.0~1.6 during copper continuous casting；
S is casting blank section area/mm2。
5. a kind of continuous casting and solidifying course control method for use inhibiting column crystals growth according to claim 1, it is characterised in that：
Impact energy ranging from W, W=a × (1-b) that exciting force appliesC×S1.5,
A value ranges are 0.2~2.6J/mm3,
B is the metal liquid fraction/% for the strand lateral cross section for solidifying stage casing exciting force point of application position；
The value of continuous casting of iron and steel process C is 1.8~2.4, and the value of C is 1.0~1.6 during copper continuous casting；
S is casting blank section area/mm2。
6. a kind of continuous casting and solidifying course control method for use inhibiting column crystals growth according to claim 4, it is characterised in that：
Apply exciting force in the corresponding two sides of continuous casting billet (100).
7. a kind of continuous casting and solidifying course control method for use inhibiting column crystals growth according to claim 6, it is characterised in that：
Corresponding position in continuous casting billet (100) both sides applies identical exciting force simultaneously.
8. according to a kind of continuous casting and solidifying course control method for use inhibiting column crystals growth of claim 1-7 any one of them,
It is characterized in that：Along continuous casting billet (100) liquidus curve length direction, at least it is arranged 1 on the surface of the solidified shell of continuous casting billet (100)
The point of application of group exciting force.
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| CN201810268562.2A CN108500226A (en) | 2018-03-29 | 2018-03-29 | A kind of continuous casting and solidifying course control method for use inhibiting column crystals growth |
| PCT/CN2019/078325 WO2019184730A1 (en) | 2018-03-29 | 2019-03-15 | Continuous casting solidification process control method for inhibiting growth of columnar crystals |
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| CN201810268562.2A CN108500226A (en) | 2018-03-29 | 2018-03-29 | A kind of continuous casting and solidifying course control method for use inhibiting column crystals growth |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2019184730A1 (en) * | 2018-03-29 | 2019-10-03 | 马鞍山钢铁股份有限公司 | Continuous casting solidification process control method for inhibiting growth of columnar crystals |
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| WO2019184730A1 (en) | 2019-10-03 |
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