CN106029256B - The continuous casing of steel - Google Patents
The continuous casing of steel Download PDFInfo
- Publication number
- CN106029256B CN106029256B CN201580008825.0A CN201580008825A CN106029256B CN 106029256 B CN106029256 B CN 106029256B CN 201580008825 A CN201580008825 A CN 201580008825A CN 106029256 B CN106029256 B CN 106029256B
- Authority
- CN
- China
- Prior art keywords
- mold
- lorentz force
- electromagnetic
- force density
- mixing apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
It is a primary object of the present invention to provide a kind of continuous casing of the further steel for suppressing pin hole defect.The present invention is a kind of continuous casing of steel, characterized in that, the value obtained from being equalized in the range of the lorentz force density component on the direction parallel with the long side of mold (11) will be made to exist in the iron core core (13a) of the structural element as electromagnetic mixing apparatus (13) is set to Lx (N/m3), the lorentz force density component made on the direction parallel with the short side of mold (11) value obtained from being equalized in the range of iron core core (13a) is present is set to Ly (N/m3) in the case of, calculated using F=Lx α Ly and obtain effective lorentz force density F (N/m3), try to achieve effective lorentz force density F (N/m3) relation between the power frequency (Hz) of electromagnetic mixing apparatus (13), use the frequency of the electromagnetic agitation electric current of the scope of maximum Fmax to the 0.9Fmax from effective lorentz force density F to carry out the continuously casting of steel.
Description
Technical field
The present invention relates to a kind of operation for most preferably carrying out the electromagnetic mixing apparatus located at mold so as to continuously casting steel
Method.
Background technology
As the main cause of the quality deterioration for the blank surface for making to be fabricated by using continuously casting, pin hole can be there are
Property defect.Because the Ar gases for being blown into submersed nozzle to suppress the closing of submersed nozzle in continuously casting enter
Enter in the molten steel into mold, and be solidified shell seizure, so as to produce the pin hole defect.
As the method for suppressing the pin hole defect, the method that electromagnetic mixing apparatus is set in mold is more effective.Make
For the operations factor of the electromagnetic mixing apparatus, molten steel flow speed, submersed nozzle, molten steel handling capacity can be there are
(throughput), Lorentz force etc..
As the technology these operations factors being set in appropriate scope, for example, disclose following technologies.
For example, there is such a technology disclosed in patent document 1：In order to which the surface defect for reducing obtained strand is sent out
Raw rate, 10cm/s~60cm/s is set to by the electromagnetic agitation flow velocity in meniscus position.
In addition, there is such a technology disclosed in patent document 2：Using between submersed nozzle and the long side of mold away from
From, submersed nozzle and molten steel tap in the casting direction with a distance from, molten steel handling capacity, magnetic flux density in freezing interface etc.
Parameter, solidified shell will be attached to as bubble caused by strand surface defect be set in as defined in value below.Moreover, special
In sharp document 2, describe by shape, the shape of mold for changing submersed nozzle so as to control submersed nozzle and mold long
The technology on the distance between side.
In addition, there is such a technology disclosed in patent document 3：The floating of bubble in order to promote Ar gases and avoid
Covering slag is rolled into molten steel, and the average value using the electromagnetic force on the direction parallel with the long side of mold is 3000N/m3~
12000N/m3, the local value on parallel with mold short side direction be -2000N/m3~2000N/m3, on direction vertically downward
Local value be -1000N/m3~1000N/m3Mode apply electromagnetic force.
By the technology disclosed in the application patent document 1~3, pin hole defect can be suppressed to a certain extent.So
And, pin hole defect is not wholly absent.Due to the surface quality increasingly severization of the steel plate required by user, therefore, need
Further to suppress the technology of pin hole defect.
In the continuously casting of steel, electromagnetic mixing apparatus is the device maximally efficient for suppressing pin hole defect.Institute
State in the technology disclosed in patent document 1~3, also have studied in detail produced by electromagnetic mixing apparatus electromagnetic force, by electromagnetism
The appropriate scope for the molten steel flow speed that power is produced.
Here, electromagnetic mixing apparatus is to make to produce Lorentz force in in-mold molten steel so that the device of MOLTEN STEEL FLOW.Should
Lorentz force is only produced in conductive molten steel, without producing in the extremely low material of the conductances such as the bubble of Ar gases
In (the commonly known as material of insulator).
Thus, the bubble phase of Ar gases is moved round about for the molten steel in mold.That is, as shown in figure 8,
In the electromagnetic force produced by electromagnetic mixing apparatus, also increase pin hole containing making the bubble of Ar gases be concentrated in blank surface
The negative component of defect.
The component for the electromagnetic force that the bubble of the Ar gases contained in the molten metal concentrates in blank surface is set to be referred to as " electricity
Magnetic repulsion ", " electromagnetism Archimedes power ", are described in detail in non-patent literature 1.In addition, the reference in Fig. 8
1 represents mold wall, and reference 2 represents solidified shell, and reference 3 represents freezing interface, and reference 4 represents Ar gases
Bubble, in addition, the arrow towards upside on the downside of the paper represents Lorentz force, from paper on the upside of arrow towards downside represent
Electromagnetic repulsive force.In addition, in non-patent literature 2, disclosing a kind of in view of the long-range navigation of the molten steel acted in continuously casting
The hereby hot fluid simulation of force density.
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 6-605 publications
Patent document 2：Japanese Unexamined Patent Publication 2007-216288 publications
Patent document 3：Japanese Unexamined Patent Publication 2010-240687 publications
Non-patent literature
Non-patent literature 1：Iron and steel, Vol.83 (1997), No.1, p.30~35
Non-patent literature 2：K.Takatani：ISIJ International, Vol.43,2003, No.6, p.915-922
The content of the invention
Problems to be solved by the invention
The problem to be solved in the present invention point is：In continuously casting steel, during the electromagnetic agitation of in-mold molten steel,
In the case of conventional art, it is not conceived to and determines that preferably electromagnetism is stirred by the electromagnetic repulsive force that electromagnetic mixing apparatus is produced
Mix the design of condition.
The solution used to solve the problem
It is an object of the invention to by can reduce the electromagnetism produced during electromagnetic agitation in-mold molten steel as much as possible
The mode of repulsive force determines the optimal power frequency of electromagnetic mixing apparatus, so as to further suppress pin hole defect.
The present invention is the result of study based on inventor described later and makes,
The present invention is a kind of continuous casing of steel, and it uses the electromagnetic mixing apparatus located at mold, it is characterised in that
The electromagnetic mixing apparatus has the iron core core as structural element,
In the model that the lorentz force density component on the direction parallel with the long side of mold will be made to exist in the iron core core
Value obtained from enclosing interior equalization is set to Lx (N/m3),
The scope that the lorentz force density component made on the direction parallel with mold short side is existed in the iron core core
Value obtained from interior equalization is set to Ly (N/m3) in the case of,
Calculated using following formula and obtain effective lorentz force density F (N/m3),
F=Lx- α Ly,
Here, in the formula, α is the coefficient (=3~7) for the harmful effect degree for representing electromagnetic repulsive force,
The relation between effective lorentz force density F and the power frequency (Hz) of electromagnetic mixing apparatus is tried to achieve,
Use the electromagnetic agitation electric current of the scope of maximum Fmax to the 0.9Fmax from effective lorentz force density F
Frequency.
In the present invention, due to the electromagnetism row produced with that can reduce as much as possible during electromagnetic agitation in-mold molten steel
The mode of repulsion determines the optimal power frequency of electromagnetic mixing apparatus, therefore, it is possible to suppress the bubble of Ar gases as much as possible
Concentrated in blank surface.
The effect of invention
Using the present invention, because the bubble that can suppress Ar gases as much as possible is concentrated in blank surface, therefore, compared to
The continuous casing of the steel of conventional art has been used, can further suppress pin hole defect.
Brief description of the drawings
Fig. 1 be illustrate the present invention steel continuous casing used in mold and electromagnetic mixing apparatus figure, be from
Observe the figure of mold in top.
Fig. 2 is to represent the long-range navigation that strand obtained by Numerical Simulations, iron core core is extracted on the center of direction
The hereby figure of the distribution of force density.
Fig. 3 is to represent the iron for making the lorentz force density component on the direction parallel with the long side of mold in electromagnetic mixing apparatus
The figure of relation in the range of core core is present obtained from equalization between value Lx and power frequency.
Fig. 4 is the iron for representing to make the lorentz force density component on the direction parallel with mold short side in electromagnetic mixing apparatus
The figure of relation in the range of core core is present obtained from equalization between value Ly and power frequency.
Fig. 5 is the figure for representing the relation between Ly/Lx and power frequency.
Fig. 6 is the pin hole for representing to investigate the per unit area of freezing interface caused by power frequency using numerical analysis
Number (individual/m2) change obtained from result figure.
Fig. 7 is that the factor alpha for representing the harmful effect degree by electromagnetic repulsive force is represented is set in the case of 5, effective Lip river
The figure of human relations hereby force density F frequency dependence.
Fig. 8 is the figure for illustrating electromagnetic repulsive force.
Embodiment
In the present invention, by so that the electromagnetic repulsive force produced during electromagnetic agitation in-mold molten steel can be reduced as much as possible
Mode determine the optimal power frequency of electromagnetic mixing apparatus so that realize further suppress pin hole defect as mesh
's.
Inventor have studied in detail to produce in operation when mold is provided with the continuous casting machine of electromagnetic mixing apparatus in mold
Raw electromagnetic repulsive force, as a result draws：Pin hole defect can be reduced by suppressing electromagnetic repulsive force.
Then, for by suppressing electromagnetic repulsive force so that Ar gas bubbles are not close to the electromagnetic force near freezing interface
Applying method, inventor is further studied, and as a result specify that in the presence of the appropriate power frequency when applying electromagnetic force.
In the case of mold viewed from above, the mold and electromagnetic mixing apparatus used during the research is Fig. 1
Shown common shape and polarity, mold and electromagnetic mixing apparatus identical mold and electricity with illustrating in patent document 3
Magnetic agitating device.Reference 11 in Fig. 1 is that Copper casting mould (is also referred to as mold below.), reference 12 is immersion water
Mouthful, reference 13 is electromagnetic mixing apparatus, and reference 13a is the iron core core for constituting electromagnetic mixing apparatus 13, accompanying drawing mark
Note 13aa is formed at the teeth portion of iron core core 13, and reference 13b is wound around the winding of iron core core 13a periphery.
Fig. 2 is to represent to extract on the center of direction, Lip river using the strand of Numerical Simulations acquisition, iron core core
The figure of the human relations hereby distribution of force density.Here, lorentz force density refers to the electromagnetic force (N/m of per unit molten steel volume3)。
The distribution of lorentz force density shown in Fig. 2 is, with width 1200mm × thickness 250mm strand size, and will to use
It is set to 25mm in the thickness for the copper coin for forming mold, the conductance of mold is set to 1.9 × 107S/m and carry out numerical analysis mould
Result obtained from plan.
Lorentz force density shown in Fig. 2 is distributed as the distribution for stirring the molten steel in mold counterclockwise, in casting
The near wall of mould 11 has the larger Lorentz force along the long side direction of mold 11.
As Fig. 2 institutes are clear and definite, also have along the Lorentz force of the wall of the mold many towards mold
Internal component.The Lorentz force of such inside towards mold is acted on as the electromagnetic repulsive force of the wall towards mold
The bubble of Ar gases.That is, the bubble of Ar gases is transported to solidified shell near interface in the presence of electromagnetic repulsive force, so that
Make the increase of pin hole defect.
Even if increasing EMS (electromagnetic agitations：Electro-Magnetic Stirrer) current value, point of lorentz force density
Cloth will not also change.That is, increase the current value of electromagnetic mixing apparatus and in the case of making flow velocity increased, it is outer using being solidified
The cleaning performance of the pin hole of shell interface capture, results in the inhibition of pin hole defect, on the other hand, due to being arranged in electromagnetism
In the presence of repulsion, towards the bubble increase of the Ar gases at solidified shell interface, therefore, the increase of pin hole defect.
As will be explained below, inventor's progress is studied obtained result and is：In order that the direction of Lorentz force
Component reduction inside mold, the power frequency for changing electromagnetic mixing apparatus is highly effective.
Fig. 3 is to represent the component for making the lorentz force density on the direction parallel with the long side of mold in electromagnetic mixing apparatus
Value Lx (N/m obtained from iron core core is equalized in the range of existing3) relation between power frequency (Hz) figure.Will be with
Lorentz force on the direction of rotation identical direction of the molten steel produced by electromagnetic agitation is set to just, by the long-range navigation in opposite direction
Hereby power is set to negative, so as to calculate the described value Lx on the direction parallel with the long side of mold.
Specifically, in fig. 2, leaned on than the short side center of mold in the region above paper, by paper left direction
Lorentz force density be set to just, the lorentz force density in paper right direction is set into negative, leaned at the short side center than mold
In region below paper, the lorentz force density in paper right direction is set to just, by the Lorentz force in paper left direction
Density is set to bear to be calculated.
In figure 3, the maximum of the described value Lx on the direction parallel with the long side of mold is present in power frequency and is
In the range of 2.3Hz~2.5Hz, in order that stirring flow velocity turns into greatest extent, the electric current frequency of the 2.3Hz~2.5Hz should be selected
Rate.
Fig. 4 is to represent to make the component of the lorentz force density on the direction parallel with mold short side to be deposited in the iron core core
Value Ly (N/m obtained from being equalized in the range of3) relation between power frequency (Hz) figure.By towards in mold
The lorentz force density of side is set to just, the lorentz force density towards the outside of mold is set into negative, so as to calculate short with mold
Described value Ly on the parallel direction in side.
Specifically, in fig. 2, than the short side center of mold by the region above paper, by from the long side of mold
The lorentz force density downward that the wall of side is separated is set to just, at the short side center than mold by the region below paper
In, calculated being set to just from the separated lorentz force density upward of the wall of the long side of mold.
That is, the described value Ly on the direction parallel with mold short side is the wall of the long side from mold of the molten steel in mold
Facing to the component of short paracentral lorentz force density, represent the bubbles of Ar gases towards the electrodynamic repulsion of the wall of mold
Power.It specify that according to Fig. 4：The power frequency of electromagnetic mixing apparatus is higher, then the described value on the direction parallel with mold short side
Ly is bigger.
Fig. 5 is illustrated on described value Ly on the direction parallel with the mold short side direction parallel relative to the long side of mold
Described value Lx ratio Ly/Lx.It specify that according to Fig. 5：Ly/Lx value is smaller, then the long-range navigation produced in the molten steel in mold
Hereby the electrodynamic repulsion force component of force density is smaller.
It specify that according to Fig. 4 and Fig. 5：Declining power frequency helps to reduce electromagnetic repulsive force.In addition, bright according to Fig. 3
Really：In order to ensure electromagnetic agitation stirring flow velocity, it is necessary to which the described value Lx on the direction parallel with the long side of mold is set in
More than to a certain degree.Fluid analysis described later simulation is studied, results verification：It is less than 0.4Hz's in power frequency
In the case of, Lorentz force is not enough.
As described above, from power frequencies of the described value Lx on the direction parallel with the long side of mold as maximum to electromagnetism
Between the not good power frequency of stirring, it should optimal power frequency is there are, according to electromagnetic field and the numerical analysis mould of fluid
Plan is studied the optimal power frequency.
The lorentz force density produced by using the calculating of foregoing method by electromagnetic mixing apparatus in molten steel
Distribution, so as to carry out electromagnetic field simulation.Implement fluid simulation using the lorentz force density of acquisition, progress is solidified shell seizure
Ar gas bubbles number evaluation.Hot fluid simulation is carried out using the method shown in non-patent literature 2, steel flow is carried out
Dynamic, heat transfer, solidification and the calculating of Ar gas bubbles.
The hot fluid simulation that method according to using non-patent literature 2 is carried out, results in the steel of continuous casting machine
The information such as flow velocity, setting rate, the distribution of Ar gas bubbles in water.Thus, how to evaluate the Ar gas for being solidified shell seizure
Body bubble turns into problem.
As Patent Document 1, it is known that if in freezing interface being 10cm/s~60cm/s molten steel flow speed, Ar gas gas
Bubble will not be solidified shell seizure.That is, the molten steel flow speed in freezing interface (claims afterwards for the flow velocity that Ar gas bubbles are captured
To catch flow velocity.) below in the case of, carry out being set to the calculating that the Ar gas bubbles positioned at the position are captured.
The threshold value for catching flow velocity generally can be described as 20cm/s, but accurately be worth and indefinite.Additionally, it is believed that carrying out
Ar gas bubbles are not solidified shell when molten steel flow speed is 19.9cm/s and catch and coagulated when molten steel flow speed is 20.1cm/s
Gu shell catches such calculate and unnatural.
Then, inventors herein propose a kind of probability that Ar gas bubbles are solidified shell seizure and be set to following formula (1) institute
The method that the continuous function shown is evaluated.Here, Pg(-) is the probability that Ar gas bubbles are solidified shell seizure, C0To be normal
Number, U (m/s) is the molten steel flow speed of freezing interface.
By the constant C in following formula (1)0It is set in the case of 100, molten steel flow speed is the seizure in the case of 20cm/s
Probability PgFor 10-8Below.This is that Ar gas bubbles in 1,000,000 Ar gas bubbles are solidified shell and catch such general
Rate, be considered as on Numerical Simulations zero value.In addition, the C for Numerical Simulations0Value be preferably 10~
1000。
[formula 1]
Pg=exp (- C0U) ... formula (1)
Ar gas bubbles are solidified the speed η of shell seizureg(individual/m3S) using the Ar gas bubbles in freezing interface
Individual number density ng(individual/m3), setting rate Rs(1/s) and catch probability Pg(-) is expressed as following formula (2).
[formula 2]
ηg=ng·Rs·Pg... formula (2)
The individual number density S of Ar gas bubbles in solidified shellg(individual/m3) calculated according to following formula (3).Here, UsIt is solidifying
Gu the slab of shell extracts the translational speed (m/s) on direction.
[formula 3]
Make the individual number density S of Ar gas bubbles obtained according to the formula (3), in solidified shellg(individual/m3) time put down
Homogenizing, so as to evaluate the number of Ar gas bubbles.At this time, it is believed that catch flow velocity because of the bubble diameter of Ar gases in the nature of things
Produce change, but the relation and indefinite.Then, by the straight of the main Ar gas bubbles existed in the mold of continuous casting machine
Footpath is set to 1mm and studied.In addition, distance casting blank top layer 2mm scope to be evaluated as to a diameter of 1mm Ar gas bubbles pair
Casting billet surface produces the scope of influence.
Represented in Fig. 6 using numerical analysis to the pin hole number of the per unit area at power frequency, freezing interface (it is individual/
m2) between the result studied of relation.
It specify that according to Fig. 6：When turning into maximum, power frequency compared to lorentz force density for 2.3Hz, in electric current frequency
Rate is that pin hole number is less in the case of 1.2Hz, and when power frequency is below 0.8Hz, pin hole number is gradually largely
Increase.
In the case where power frequency is 1.2Hz, the pin hole number of the per unit area at freezing interface turns into minimum
43 (individual/m2), because, although the lorentz force density for electromagnetic agitation declines, but is due to that electromagnetic repulsive force declines,
Therefore, the effect increase of the Ar gas bubbles reductions of mold near wall.However, making power frequency drop below 1.2Hz
When, because the lorentz force density for stirring in-mold molten steel is not enough, therefore, pin hole increase.
Generally, the power frequency of electromagnetic mixing apparatus selectes the power frequency that lorentz force density turns into maximum, in Fig. 1 institutes
In the electromagnetic mixing apparatus shown, it is the 2.3Hz read from Fig. 3 that lorentz force density, which turns into maximum power frequency,.Such as Fig. 6 institutes
Show, the pin hole number in the case of the 2.3Hz selected using conventional art power frequency is 57 (individual/m2).Thus, such as Fig. 6
Shown, what technology can more suppress pin hole defect than ever is the scope that power frequency is 0.9Hz to 2.3Hz.
Thus, inventor learns：Strand size is being set to width 1200mm × thickness 250mm, by the thickness of Copper casting mould
25mm is set to, the conductance of Copper casting mould is set to 1.9 × 107In the case of S/m, it can more suppress the suitable of pin hole number than ever
When frequency range be 0.9Hz~2.3Hz.
Such fluid analysis for being used to evaluate pin hole needs the relatively long time compared to electromagnetic field analysis.Then,
Inventor have studied the method that optimal frequency is selected according to the result of electromagnetic field analysis.
For pin hole number, make the lorentz force density component on the direction parallel with the long side of mold in electromagnetic mixing apparatus
Iron core core exist in the range of equalize obtained from value Lx (N/m3) played a role as the positive factor, make short with mold
Lorentz force density component on the parallel direction in side in the range of the iron core core of electromagnetic mixing apparatus is present equalization and
Obtained value Ly (N/m3) played a role as the negative factor.Therefore, by effective lorentz force density F (N/m3) such as following formula (4)
It is shown to be defined.Here, coefficients of the α for the harmful effect degree of expression electromagnetic repulsive force.
[formula 4]
F=Lx- α Ly ... formulas (4)
The α is the coefficient of the harmful effect degree on the expression direction parallel with mold short side, therefore, the influence degree
Changed according to the length of mold short side.As common continuous casting machine, on 200mm to 300mm mold bond length,
Inventor to as the formula (4) obtain evaluation turn into Fig. 6 shown in evaluation identical α studied.Its result is learnt：
It is preferred that α to be set to 3~7 scope.In addition, in the case where α is less than 3, the Lorentz force parallel with mold short side can be underestimated, when
When α is more than 7, the Lorentz force parallel with mold short side can be over-evaluated.
Fig. 7 is that the factor alpha for representing the harmful effect degree by electromagnetic repulsive force is represented is set in the case of 5, effective Lip river
Human relations hereby force density F (N/m3) frequency dependence figure.It specify that according to Fig. 7：When power frequency is 1.2Hz, effective Lorentz
Force density F (N/m3) turn into maximum.
According to Fig. 3 and Fig. 6, what technology can more suppress pin hole defect than ever is that power frequency is 0.9Hz~2.3Hz
Scope, (power frequency is scope of the scope equivalent to maximum Fmax to the 0.9Fmax from effective lorentz force density F
0.9Hz~2.0Hz).Thus, by using the formula (4), optimal electromagnetism can be determined according only to the result of electromagnetic field analysis
The frequency of agitating device.
The present invention is the result of study based on inventor and made,
It is a kind of continuous casing of steel, and the continuous casing of the steel uses the electromagnetic agitation located at mold to fill
Put, it is characterised in that
The electromagnetic mixing apparatus has the iron core core as structural element,
In the model that the lorentz force density component on the direction parallel with the long side of mold will be made to exist in the iron core core
Value obtained from enclosing equalization is set to Lx (N/m3),
The scope that the lorentz force density component made on the direction parallel with mold short side is existed in the iron core core
Value obtained from equalization is set to Ly (N/m3) in the case of,
Calculated using the formula (4) and obtain effective lorentz force density F (N/m3),
Try to achieve effective lorentz force density F (N/m3) relation between the power frequency (Hz) of electromagnetic mixing apparatus,
Use the electromagnetic agitation electric current of the scope of maximum Fmax to the 0.9Fmax from effective lorentz force density F
Frequency.
According to the present invention, it can be determined to reduce electromagnetic agitation as much as possible according only to the result of electromagnetic field analysis
The optimal power frequency of the electromagnetic mixing apparatus of the electromagnetic repulsive force produced during in-mold molten steel.Thus, it is possible to as much as possible
The bubble for suppressing Ar gases is concentrated in blank surface, so as to further suppress pin hole defect.
Certainly, the present invention is not limited to described example, it goes without saying that as long as in the technological thought described in claim
In the range of, it is possible to suitably change embodiment.
Inventor has carried out fluid simulation using the method shown in non-patent literature 2, but self-evident, carries out hot fluid mould
The method of plan is not limited to the method described in non-patent literature 2.
Description of reference numerals
11st, mold；13rd, electromagnetic mixing apparatus；13a, iron core core.
Claims (1)
1. a kind of continuous casing of steel, it uses the electromagnetic mixing apparatus located at mold, it is characterised in that
The electromagnetic mixing apparatus has the iron core core as structural element,
In the lorentz force density component that will make on the direction parallel with the long side of mold in the range of iron core core presence
Value is set to Lx obtained from equalization,
The lorentz force density component made on the direction parallel with mold short side is put down in the range of iron core core presence
In the case that value is set to Ly obtained from homogenizing,
Calculated using following formula and obtain effective lorentz force density F,
F=Lx- α Ly,
Here, coefficients of the α for the harmful effect degree of expression electromagnetic repulsive force, α=3~7, Lx and Ly unit are N/m3, effectively
Lorentz force density F unit is N/m3,
The relation between effective lorentz force density F and the power frequency of electromagnetic mixing apparatus is tried to achieve, here, the list of power frequency
Position is Hz,
Use the frequency of the electromagnetic agitation electric current of the scope of maximum Fmax to the 0.9Fmax from effective lorentz force density F
Rate.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-034130 | 2014-02-25 | ||
| JP2014034130A JP6379515B2 (en) | 2014-02-25 | 2014-02-25 | Steel continuous casting method |
| PCT/JP2015/052627 WO2015129382A1 (en) | 2014-02-25 | 2015-01-30 | Continuous steel casting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106029256A CN106029256A (en) | 2016-10-12 |
| CN106029256B true CN106029256B (en) | 2017-10-27 |
Family
ID=54008708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580008825.0A Active CN106029256B (en) | 2014-02-25 | 2015-01-30 | The continuous casing of steel |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP3112051B8 (en) |
| JP (1) | JP6379515B2 (en) |
| KR (1) | KR101758034B1 (en) |
| CN (1) | CN106029256B (en) |
| BR (1) | BR112016019404B1 (en) |
| ES (1) | ES2738484T3 (en) |
| PL (1) | PL3112051T3 (en) |
| WO (1) | WO2015129382A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3760337A4 (en) | 2018-02-26 | 2021-07-14 | Nippon Steel Corporation | Molding facility |
| JP7159630B2 (en) * | 2018-06-11 | 2022-10-25 | 日本製鉄株式会社 | Electromagnetic stirring method, electromagnetic stirring device and mold facility |
| JP7135728B2 (en) * | 2018-10-30 | 2022-09-13 | 日本製鉄株式会社 | Slab Quality Estimating Method, Steel Manufacturing Method, Slab Quality Estimating Device, and Program |
| CN115982895B (en) * | 2023-03-20 | 2023-07-21 | 北京科技大学 | Determination method for technological parameters of alternate electromagnetic stirring of round billet continuous casting crystallizer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527973A (en) * | 2010-12-15 | 2012-07-04 | 鞍钢股份有限公司 | Method for establishing electromagnetic stirring parameters of secondary cooling area of plate blank |
| CN102990027A (en) * | 2012-12-31 | 2013-03-27 | 上海大学 | Low-energy-consumption electromagnetic stirring method for continuous casting and metal continuous casting device |
| CN103357838A (en) * | 2012-03-26 | 2013-10-23 | 卓然(靖江)设备制造有限公司 | Novel electromagnetic centrifugal furnace tube casting process |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4011929B2 (en) * | 2002-02-19 | 2007-11-21 | 株式会社神戸製鋼所 | Continuous casting method of steel |
| KR100764945B1 (en) * | 2003-04-11 | 2007-10-08 | 제이에프이 스틸 가부시키가이샤 | Method of continuous steel casting |
| JP4539024B2 (en) * | 2003-04-22 | 2010-09-08 | Ｊｆｅスチール株式会社 | Steel continuous casting method |
| JP4539251B2 (en) * | 2004-09-14 | 2010-09-08 | Ｊｆｅスチール株式会社 | Steel continuous casting method |
| JP5076330B2 (en) | 2006-02-20 | 2012-11-21 | Ｊｆｅスチール株式会社 | Steel continuous casting method |
| DE102007037340B4 (en) * | 2007-08-03 | 2010-02-25 | Forschungszentrum Dresden - Rossendorf E.V. | Method and device for the electromagnetic stirring of electrically conductive liquids |
| JP5310205B2 (en) * | 2009-04-06 | 2013-10-09 | 新日鐵住金株式会社 | Control method of molten steel flow in mold in continuous casting equipment. |
| JP5716440B2 (en) * | 2011-02-10 | 2015-05-13 | 新日鐵住金株式会社 | Slab manufacturing method and slab with excellent surface quality |
-
2014
- 2014-02-25 JP JP2014034130A patent/JP6379515B2/en active Active
-
2015
- 2015-01-30 CN CN201580008825.0A patent/CN106029256B/en active Active
- 2015-01-30 PL PL15754485T patent/PL3112051T3/en unknown
- 2015-01-30 BR BR112016019404-7A patent/BR112016019404B1/en active IP Right Grant
- 2015-01-30 KR KR1020167024368A patent/KR101758034B1/en active IP Right Grant
- 2015-01-30 WO PCT/JP2015/052627 patent/WO2015129382A1/en active Application Filing
- 2015-01-30 EP EP15754485.9A patent/EP3112051B8/en active Active
- 2015-01-30 ES ES15754485T patent/ES2738484T3/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527973A (en) * | 2010-12-15 | 2012-07-04 | 鞍钢股份有限公司 | Method for establishing electromagnetic stirring parameters of secondary cooling area of plate blank |
| CN103357838A (en) * | 2012-03-26 | 2013-10-23 | 卓然(靖江)设备制造有限公司 | Novel electromagnetic centrifugal furnace tube casting process |
| CN102990027A (en) * | 2012-12-31 | 2013-03-27 | 上海大学 | Low-energy-consumption electromagnetic stirring method for continuous casting and metal continuous casting device |
Non-Patent Citations (1)
| Title |
|---|
| 电磁搅拌中旋转磁场及洛伦兹力的数值模拟;张红霞等;《大学物理实验》;20101026;第23卷(第5期);第17-19页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| PL3112051T3 (en) | 2019-10-31 |
| EP3112051B8 (en) | 2019-07-31 |
| WO2015129382A1 (en) | 2015-09-03 |
| KR20160117586A (en) | 2016-10-10 |
| BR112016019404B1 (en) | 2021-05-11 |
| CN106029256A (en) | 2016-10-12 |
| EP3112051A4 (en) | 2017-10-18 |
| JP6379515B2 (en) | 2018-08-29 |
| EP3112051B1 (en) | 2019-05-15 |
| JP2015157309A (en) | 2015-09-03 |
| EP3112051A1 (en) | 2017-01-04 |
| ES2738484T3 (en) | 2020-01-23 |
| KR101758034B1 (en) | 2017-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106029256B (en) | The continuous casing of steel | |
| KR20180115364A (en) | Non-contacting molten metal flow control | |
| CN103781572A (en) | Continuous casting device for steel | |
| EP1508389A2 (en) | Method and apparatus for continuous casting of metals | |
| CA2971130A1 (en) | Method for continuously casting steel | |
| JP2008183597A (en) | Continuous casting method of steel, and method for manufacturing steel plate | |
| WO2016093328A1 (en) | Molten metal quality improving type low pressure casting method and device, molten metal quality improving type squeeze casting method and device, continuous casting method and continuous casting device with molten metal quality improving device, and casting method and casting device | |
| JP6164040B2 (en) | Steel continuous casting method | |
| TW202000340A (en) | Device and method for controlling steel flow in mold for thin slab casting | |
| CN101720262A (en) | Steel continuous casting method and in-mold molten steel fluidity controller | |
| JP5973023B2 (en) | Molten quality improved low pressure casting method and apparatus, molten quality improved squeeze casting method and apparatus, continuous casting method and continuous casting apparatus with molten quality improving apparatus, casting method and casting apparatus | |
| CN104308109B (en) | A kind of copper alloy plate strip impulse electromagnetic oscillation horizontal continuous-casting method and device | |
| JP2010179342A (en) | Method for continuously casting steel, and cast slab manufactured by the same method | |
| JP5310205B2 (en) | Control method of molten steel flow in mold in continuous casting equipment. | |
| JP2020124738A (en) | Tundish | |
| JP5772767B2 (en) | Steel continuous casting method | |
| JP6527069B2 (en) | Operating method of intermediate container for molten steel | |
| JP2008100248A (en) | Continuously casting tundish, and method of continuous casting | |
| JP2007098398A (en) | Apparatus for controlling fluidity of molten steel | |
| JP6167862B2 (en) | Molten metal cleaning method and molten metal cleaning apparatus | |
| Prodhan | Semi-solid processing by electric current during sand casting of aluminium alloys | |
| JPWO2019172142A1 (en) | Continuous casting method, slab slab, and continuous casting machine | |
| JP2006000896A (en) | Continuous casting method | |
| KR20120043332A (en) | Apparatus and method for continous casting using electromagnetic stirring device | |
| JP2012166209A (en) | Method for manufacturing cast slab and cast slab excellent in surface quality |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Tokyo, Japan, Japan Patentee after: Nippon Iron & Steel Corporation Address before: Tokyo, Japan, Japan Patentee before: Nippon Steel Corporation |
|
| CP01 | Change in the name or title of a patent holder |