CN106029256A - Continuous steel casting method - Google Patents
Continuous steel casting method Download PDFInfo
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- CN106029256A CN106029256A CN201580008825.0A CN201580008825A CN106029256A CN 106029256 A CN106029256 A CN 106029256A CN 201580008825 A CN201580008825 A CN 201580008825A CN 106029256 A CN106029256 A CN 106029256A
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- mold
- lorentz force
- electromagnetic
- force density
- mixing apparatus
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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
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
Abstract
The purpose of the present invention is to provide a continuous steel casting method that further curbs pinhole defects. The present invention is a continuous steel casting method in which, when the value resulting from averaging the Lorentz force density component in a direction that is parallel to a long side of a mold (11) in the range in which an iron core (13a) that is a constituent element of an electromagnetic stirring device (13) is present is denoted by Lx (N/m3) and the value resulting from averaging the Lorentz force density component in a direction that is parallel to a short side of the mold (11) in the range in which the iron core (13a) is present is denoted by Ly (N/m3), the relationship between an effective Lorentz force density (F) (N/m3) that is calculated using [F=Lx-alpha*Ly] and the current frequency (Hz) of the electromagnetic stirring device (13) is determined, and continuous casting of steel is performed using an electromagnetic stirring current frequency that is in the range of 0.9Fmax from the maximum value (Fmax) of the actual Lorentz force density (F).
Description
Technical field
The present invention relates to a kind of operation most preferably carrying out being located at the electromagnetic mixing apparatus of mold thus continuous
The method of cast steel.
Background technology
As making utilization cast the main cause that the quality of the blank surface being fabricated by deteriorates continuously, can arrange
Act has pin hole defect.Due in order to suppress the closing of submersed nozzle to be blown into when casting continuously
The Ar gas of submersed nozzle enters in the molten steel in mold, and is solidified shell seizure, thus produces
This pin hole defect.
As the method suppressing described pin hole defect, at mold, the method for electromagnetic mixing apparatus is set more
Effectively.As the operations factor of this electromagnetic mixing apparatus, can there are molten steel flow speed, submersed nozzle,
Molten steel handling capacity (throughput), Lorentz force etc..
As the technology these operations factor being set in suitable scope, such as, disclose following skill
Art.
Such as, disclosed in patent documentation 1, has such a technology: in order to reduce obtained strand
Surface defect incidence rate, is set to 10cm/s～60cm/s by the electromagnetic agitation flow velocity in meniscus position.
It addition, there is such a technology disclosed in patent documentation 2: use submersed nozzle and mold long
Distance, submersed nozzle and molten steel tap between limit distance in the casting direction, molten steel handling capacity,
The parameters such as the magnetic flux density in freezing interface, the table of the strand caused being attached to solidified shell by bubble
Planar defect is set in below the value of regulation.And, in patent documentation 2, describe and immersed by change
The shape at the formula mouth of a river, the shape of mold thus control the skill of the distance between submersed nozzle and the long limit of mold
Art.
It addition, there is such a technology disclosed in patent documentation 3: in order to promote the bubble of Ar gas
Float and avoid covering slag to be rolled in molten steel, putting down with the electromagnetic force on the direction that limit long with mold is parallel
Average is 3000N/m3～12000N/m3, local value on parallel with mold minor face direction be
-2000N/m3～2000N/m3, local value on direction vertically downward be-1000N/m3~
1000N/m3Mode apply electromagnetic force.
By applying the technology disclosed in described patent documentation 1～3, it is possible to suppression pin hole to a certain extent
Defect.But, pin hole defect is not wholly absent.The surface product of the steel plate required by user
Matter increasingly stringent, accordingly, it would be desirable to suppress the technology of pin hole defect further.
In the casting continuously of steel, electromagnetic mixing apparatus is the dress maximally efficient for suppression pin hole defect
Put.In the technology disclosed in described patent documentation 1～3, have studied the most in detail by electromagnetic mixing apparatus
The electromagnetic force produced, the suitable scope of molten steel flow speed produced by electromagnetic force.
Here, electromagnetic mixing apparatus is to make to produce Lorentz force in in-mold molten steel so that MOLTEN STEEL FLOW
Device.This Lorentz force only produces in the molten steel with electric conductivity, and does not produce the bubble at Ar gas
In the material (being commonly called the material of insulator) extremely low etc. conductivity.
Thus, the bubble phase of Ar gas moves round about for the molten steel in mold.It is to say,
As shown in Figure 8, in the electromagnetic force produced by electromagnetic mixing apparatus, exist possibly together with the bubble making Ar gas
Blank surface is concentrated and is increased the negative composition of pin hole defect.
Make the composition of the electromagnetic force that the bubble of the Ar gas contained in this motlten metal concentrates at blank surface
It is referred to as " electromagnetic repulsive force ", " electromagnetism Archimedes's power ", has carried out specifically in non-patent literature 1
Bright.It addition, the reference 1 in Fig. 8 represents mold wall, reference 2 represents solidified shell, attached
Figure labelling 3 represents that freezing interface, reference 4 represent the bubble of Ar gas, it addition, court on the downside of paper
Representing Lorentz force to the arrow of upside, on the upside of paper, the arrow towards downside represents electromagnetic repulsive force.
It addition, in non-patent literature 2, disclose a kind of Lip river in view of the molten steel acted in casting continuously
The hot fluid simulation of human relations hereby force density.
Prior art literature
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 6-605 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2007-216288 publication
Patent documentation 3: Japanese Unexamined Patent Publication 2010-240687 publication
Non-patent literature
Non-patent literature 1: ferrum 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
Summary of the invention
The problem that invention is to be solved
The problem to be solved in the present invention point is: when continuous cast steel, and the electromagnetism at in-mold molten steel stirs
During mixing, in the case of conventional art, it is not conceived to the electromagnetism row produced by electromagnetic mixing apparatus
Repulsion and determine the design of preferably electromagnetic agitation condition.
For solving the scheme of problem
It is an object of the invention to by producing during so that electromagnetic agitation in-mold molten steel can be reduced as much as possible
The mode of raw electromagnetic repulsive force determines the optimal power frequency of electromagnetic mixing apparatus, thus presses down further
Pin hole defect processed.
The present invention is result of study based on inventor described later and makes,
The present invention is the continuous casing of a kind of steel, and it uses the electromagnetic mixing apparatus being located at mold, its
It is characterised by,
The lorentz force density composition on parallel direction, limit long with mold will be made as described electromagnetism
The iron core core of the structural element of agitating device exist in the range of equalization and the value that obtains is set to Lx
(N/m3),
The lorentz force density composition made on the direction parallel with mold minor face is deposited at described iron core core
Equalization in the range of and the value that obtains is set to Ly (N/m3In the case of),
Try to achieve and utilize the calculated effective lorentz force density F (N/m of following formula3) fill with electromagnetic agitation
Relation between the power frequency (Hz) put,
Use is from the electromagnetism of the scope of maximum Fmax to the 0.9Fmax of described effective lorentz force density F
The frequency of stir current.
F=Lx-α Ly
Here, in described formula, α is the coefficient (=3～7) of the harmful effect degree representing electromagnetic repulsive force.
In the described present invention, owing to producing during so that electromagnetic agitation in-mold molten steel can be reduced as much as possible
The mode of electromagnetic repulsive force determine the optimal power frequency of electromagnetic mixing apparatus, therefore, it is possible to the greatest extent may be used
The bubble of Ar gas can be suppressed to concentrate at blank surface in ground.
The effect of invention
Use the present invention, owing to the bubble of Ar gas can be suppressed as much as possible to concentrate at blank surface, because of
This, compared to the continuous casing of the steel employing conventional art, it is possible to suppression pin hole lacks further
Fall into.
Accompanying drawing explanation
Fig. 1 is the mold that used of the continuous casing of the steel that the present invention is described and electromagnetic mixing apparatus
Figure, is the figure of mold viewed from above.
Fig. 2 is to represent that center, direction extracted by strand that obtained by Numerical Simulations, iron core core
On the figure of distribution of lorentz force density.
Fig. 3 is to represent that the lorentz force density composition on the direction making limit long with mold parallel is in electromagnetic agitation
The iron core core of device exist in the range of equalization and relation between value Lx and the power frequency that obtain
Figure.
Fig. 4 is to represent to make the lorentz force density composition on the direction parallel with mold minor face in electromagnetic agitation
The iron core core of device exist in the range of equalization and relation between value Ly and the power frequency that obtain
Figure.
Fig. 5 is the figure representing the relation between Ly/Lx and power frequency.
Fig. 6 is the per unit face representing the freezing interface utilizing numerical analysis investigation to be caused by power frequency
Long-pending pin hole number (individual/m2) change and the figure of result that obtains.
Fig. 7 is in the case of the factor alpha of the harmful effect degree representing and would indicate that electromagnetic repulsive force is set to 5
, the figure of the frequency dependence of effective lorentz force density F.
Fig. 8 is the figure that electromagnetic repulsive force is described.
Detailed description of the invention
In the present invention, by the electricity produced during so that electromagnetic agitation in-mold molten steel can be reduced as much as possible
The mode of magnetic repulsion determines the optimal power frequency of electromagnetic mixing apparatus, thus realizes suppression further
The such purpose of pin hole defect.
Inventor have studied in detail when operation is provided with the continuous casting machine of electromagnetic mixing apparatus at mold
The electromagnetic repulsive force produced in mold, result draws: can reduce pin hole by suppression electromagnetic repulsive force
Defect.
Then, for by suppression electromagnetic repulsive force so that Ar gas bubbles not close to freezing interface near
Electromagnetic force applying method, inventor is studied further, result specify that existence apply electromagnetism
Suitable power frequency during power.
In the case of mold viewed from above, carry out mold and the electromagnetic agitation dress used during described research
Be set to the common shape shown in Fig. 1 and polarity and the mold of explanation and electromagnetic agitation in patent documentation 3
Mold that device is identical and electromagnetic mixing apparatus.Reference 11 in Fig. 1 is Copper casting mould (following also letter
It is referred to as mold.), reference 12 is submersed nozzle, and reference 13 is electromagnetic mixing apparatus, accompanying drawing
Labelling 13a is the iron core core constituting electromagnetic mixing apparatus 13, and reference 13aa is formed at iron core core
The teeth portion in portion 13, reference 13b is wound around the winding of the periphery of iron core core 13a.
Fig. 2 is to represent to utilize Numerical Simulations acquisition, the strand of iron core core to extract direction centre bit
Put, the figure of lorentz force density distribution.Here, lorentz force density refers to per unit molten steel body
Long-pending electromagnetic force (N/m3)。
The distribution of the lorentz force density shown in Fig. 2 is with the strand of width 1200mm × thickness 250mm
Size, and the thickness being used for being formed the copper coin of mold is set to 25mm, the conductivity of mold is set to 1.9
×107S/m and the result that carries out Numerical Simulations and obtain.
Lorentz force density shown in Fig. 2 be distributed as stirring the molten steel in mold counterclockwise point
Cloth, the near wall at mold 11 has the bigger Lorentz force of the long side direction along mold 11.
As Fig. 2 institute is clear and definite, the Lorentz force along the wall of described mold also has a lot of court
Composition to the inside of mold.The Lorentz force of such inside towards mold is as the wall towards mold
The electromagnetic repulsive force in face acts on the bubble of Ar gas.That is, the bubble of Ar gas is at the work of electromagnetic repulsive force
Solidified shell near interface it is transported to, so that pin hole defect increases under with.
Even if increasing EMS (electromagnetic agitation: Electro-Magnetic Stirrer) current value, Lorentz force
The distribution of density also will not change.That is, increase at the current value making electromagnetic mixing apparatus and make flow velocity increase
In the case of, utilize the cleaning performance of the pin hole being solidified shell interfaces capture, it is possible to obtain pin hole and lack
The inhibition fallen into, on the other hand, due under the effect of electromagnetic repulsive force, towards solidified shell interface
Ar gas bubble increase, therefore, pin hole defect increase.
As will be explained below, inventor carries out studying the result obtained and is: in order to make Lorentz
Power towards the constituent reduction within mold, the power frequency changing electromagnetic mixing apparatus is highly effective.
Fig. 3 is that the composition representing the lorentz force density on the direction making limit long with mold parallel stirs at electromagnetism
Value Lx (the N/m mixing equalization in the range of the iron core core existence of device and obtain3) and power frequency
(Hz) figure of the relation between.By the direction identical with the direction of rotation of the molten steel produced by electromagnetic agitation
On Lorentz force be just set to, be set to bear by the Lorentz force on rightabout, thus calculate long with mold
Described value Lx on the direction that limit is parallel.
Specifically, in fig. 2, leaning in the region above paper than the minor face center of mold, by paper
Lorentz force density in the left direction of face is just set to, and is set to by the lorentz force density in paper right direction
Negative, leaning in the region below paper than the minor face center of mold, by the Lorentz force in paper right direction
Density is just set to, and is set to bear by the lorentz force density in paper left direction and calculates.
In figure 3, the maximum of described value Lx on parallel with the long limit of mold direction is present in electric current
Frequency is in the range of 2.3Hz～2.5Hz, in order to make stirring flow velocity become to greatest extent, should select this
The power frequency of 2.3Hz～2.5Hz.
Fig. 4 is that the composition representing and making the lorentz force density on the direction parallel with mold minor face is at described ferrum
Core core exist in the range of equalization and the value Ly (N/m that obtains3) and power frequency (Hz) between
The figure of relation.The lorentz force density of the inner side towards mold is just set to, by the outside towards mold
Lorentz force density be set to bear, thus calculate described value Ly on the direction parallel with mold minor face.
Specifically, in fig. 2, at the minor face center than mold by the region above paper, will be from
The separate lorentz force density downward of wall of the long side of mold is just set to, shorter than mold
Center, limit is by the region below paper, by from the separate Lip river upward of the wall of the long side of mold
Human relations hereby force density is set to just calculate.
That is, described value Ly on parallel with mold minor face direction is the length from mold of the molten steel in mold
The wall of avris, towards the composition of short paracentral lorentz force density, represents that the bubble of Ar gas is towards casting
The electromagnetic repulsive force of the wall of mould.Specify that according to Fig. 4: the power frequency of electromagnetic mixing apparatus is the highest,
Described value Ly on then parallel with mold minor face direction is the biggest.
Described value Ly that Fig. 5 illustrates on the direction parallel with mold minor face is parallel relative to limit long with mold
Direction on the ratio Ly/Lx of described value Lx.Specify that according to Fig. 5: the value of Ly/Lx is the least, then cast
The electromagnetic repulsive force composition of the lorentz force density produced in the molten steel in mould is the least.
Specify that according to Fig. 4 and Fig. 5: make power frequency decline and contribute to reducing electromagnetic repulsive force.It addition,
Specify that according to Fig. 3: in order to ensure the stirring flow velocity of electromagnetic agitation, need parallel for limit long with mold
Described value Lx on direction is set in more than to a certain degree.Fluid analysis described later simulation is ground
Studying carefully, results verification: in the case of power frequency is less than 0.4Hz, Lorentz force is not enough.
As it has been described above, described value Lx on the direction parallel from limit long with mold becomes maximum electric current frequency
Rate is between the best power frequency of electromagnetic agitation, it should there are optimal power frequency, according to electromagnetism
This optimal power frequency is studied by the Numerical Simulations of field and fluid.
The Lorentz produced in molten steel by electromagnetic mixing apparatus by utilizing foregoing method to calculate
The distribution of force density, thus carry out electromagnetic field simulation.The lorentz force density obtained is used to implement fluid mould
Intend, carry out being solidified the evaluation of the number of the Ar gas bubbles that shell catches.Utilize non-patent literature 2 institute
The method shown carries out hot fluid simulation, carries out MOLTEN STEEL FLOW, conducts heat, solidifies and the meter of Ar gas bubbles
Calculate.
The hot fluid simulation carried out according to the method utilized described in non-patent literature 2, it is possible to obtain casting continuously
The information such as the distribution making the flow velocity in the molten steel of machine, setting rate, Ar gas bubbles.Thus, how to comment
Valency is solidified the Ar gas bubbles of shell seizure becomes problem.
As Patent Document 1, it is known that if freezing interface is the molten steel flow speed of 10cm/s～60cm/s,
Then Ar gas bubbles will not be solidified shell seizure.That is, the molten steel flow speed in freezing interface is Ar gas
The flow velocity that bubble is captured (is referred to as catching flow velocity afterwards.) below in the case of, carry out being set to be positioned at this
The calculating that the Ar gas bubbles of position is captured.
The threshold value of described seizure flow velocity generally can be described as 20cm/s, but is worth accurately and indefinite.It addition,
Think carry out Ar gas bubbles be not solidified when molten steel flow speed is 19.9cm/s shell catch and at molten steel
Flow velocity is to be solidified shell during 20.1cm/s to catch such calculating unnatural.
Then, inventors herein propose a kind of probability that Ar gas bubbles is solidified shell seizure and be set to following
The method that continuous function shown in formula (1) is evaluated.Here, Pg(-) is that Ar gas bubbles is coagulated
Gu the probability that shell catches, C0For constant, U (m/s) is the molten steel flow speed of freezing interface.
By the constant C in following formula (1)0In the case of being set to 100, molten steel flow speed is the feelings of 20cm/s
Catch probability P under conditiongIt is 10-8Below.This is an Ar gas bubbles in 1,000,000 Ar gas bubbles
It is solidified shell and catches such probability, for being considered the value of zero on Numerical Simulations.It addition, use
C in Numerical Simulations0Value be preferably 10～1000.
[formula 1]
Pg=exp (-C0U) ... formula (1)
Ar gas bubbles is solidified speed η that shell catchesg(individual/m3S) Ar in freezing interface is used
Individual number density n of gas bubblesg(individual/m3), setting rate Rs(1/s) and catch probability Pg(-) table
Reach for following formula (2).
[formula 2]
ηg=ng·Rs·Pg... formula (2)
Individual number density S of the Ar gas bubbles in solidified shellg(individual/m3) calculate according to following formula (3).
Here, UsThe translational speed (m/s) on direction extracted by slab for solidified shell.
[formula 3]
Make individual number density S of Ar gas bubbles that obtain, in solidified shell according to described formula (3)g(individual
/m3) time averaged, thus evaluate the number of Ar gas bubbles.At this time, it is believed that catch flow velocity because of Ar
The bubble diameter of gas and produce change in the nature of things, but this relation indefinite.Then, will be continuously
The diameter of the main Ar gas bubbles existed in the mold of casting machine is set to 1mm and studies.Separately
Outward, the scope of distance casting blank top layer 2mm is evaluated as the Ar gas bubbles of a diameter of 1mm to casting billet surface
Produce the scope of impact.
Fig. 6 represents and utilizes the numerical analysis pin hole to the per unit area at power frequency, freezing interface
Number (individual/m2Relation between) carries out the result studied.
Specify that according to Fig. 6: compared to lorentz force density become maximum, power frequency be 2.3Hz time,
In the case of power frequency is 1.2Hz, pin hole number is less, when power frequency is below 0.8Hz, and pin
Hole number increases the most largely.
In the case of power frequency is 1.2Hz, the pin hole number of the per unit area at freezing interface becomes
For 43 minimum (individual/m2), this is because, although the lorentz force density for electromagnetic agitation declines,
But owing to electromagnetic repulsive force declines, therefore, the effect that the Ar gas bubbles of mold near wall reduces increases
Greatly.But, when making power frequency drop below 1.2Hz, due to for stirring in-mold molten steel
Lorentz force density is not enough, and therefore, pin hole increases.
Generally, the power frequency of electromagnetic mixing apparatus selectes the electric current frequency that lorentz force density becomes maximum
Rate, in the electromagnetic mixing apparatus shown in Fig. 1, lorentz force density become maximum power frequency for from
The 2.3Hz read in Fig. 3.As shown in Figure 6, the feelings of the power frequency of the selected 2.3Hz of conventional art are utilized
Pin hole number under condition is 57 (individual/m2).Thus, as shown in Figure 6, technology more can suppress than ever
Pin hole defect be power frequency be the scope of 0.9Hz to 2.3Hz.
Thus, inventor learns: strand size is being set to width 1200mm × thickness 250mm, will
The thickness of Copper casting mould is set to 25mm, and the conductivity of Copper casting mould is set to 1.9 × 107In the case of S/m, than
The suitable frequency range that in the past more can suppress pin hole number is 0.9Hz～2.3Hz.
When such fluid analysis for evaluating pin hole needs relatively long compared to electromagnetic field analysis
Between.Then, inventor have studied the method that the result according to electromagnetic field analysis selectes optimal frequency.
For the Lorentz force Lx (N/m needed for pin hole number, electromagnetic agitation3) send out as the positive factor
Wave effect, electromagnetic repulsive force Ly (N/m3) play a role as the negative factor.Therefore, by effective Lip river
Human relations hereby force density F (N/m3) be defined as shown in following formula (4).Here, α is for representing electromagnetism
The coefficient of the harmful effect degree of repulsive force.
[formula 4]
F=Lx-α Ly ... formula (4)
Described α is the coefficient of the harmful effect degree on the direction that expression is parallel with mold minor face, therefore,
This influence degree changes according to the length of mold minor face.As common continuous casting machine, about
The mold bond length of 200mm to 300mm, described formula (4) evaluation obtained is become by inventor
The α identical with the evaluation shown in Fig. 6 is studied.Its result is learnt: α is preferably set to the model of 3～7
Enclose.It addition, in the case of α is less than 3, the Lorentz force parallel with mold minor face can be underestimated, when α surpasses
After 7 time, the Lorentz force parallel with mold minor face can be over-evaluated.
Fig. 7 is in the case of the factor alpha of the harmful effect degree representing and would indicate that electromagnetic repulsive force is set to 5
, effective lorentz force density F (N/m3) the figure of frequency dependence.Specify that according to Fig. 7: electricity
When stream frequency is 1.2Hz, effective lorentz force density F (N/m3) become maximum.
According to Fig. 3 and Fig. 6, what technology more can suppress pin hole defect than ever is that power frequency is
The scope of 0.9Hz～2.3Hz, this scope be equivalent to from the maximum Fmax of effective lorentz force density F to
The scope (power frequency is 0.9Hz～2.0Hz) of 0.9Fmax.Thus, by using described formula (4),
The frequency of optimal electromagnetic mixing apparatus can be determined according only to the result of electromagnetic field analysis.
The present invention is i.e. described result of study based on inventor and makes,
It is the continuous casing of a kind of steel, and the continuous casing of this steel uses the electromagnetism being located at mold
Agitating device, it is characterised in that
The lorentz force density composition on parallel direction, limit long with mold will be made as described electromagnetism
Scope equalization that the iron core core of the structural element of agitating device exists and the value that obtains is set to Lx
(N/m3),
The lorentz force density composition made on the direction parallel with mold minor face is deposited at described iron core core
Scope equalization and the value that obtains is set to Ly (N/m3In the case of),
Try to achieve and utilize the calculated effective lorentz force density F (N/m of described formula (4)3) and electromagnetism
Relation between the power frequency (Hz) of agitating device,
Use is from the electromagnetism of the scope of maximum Fmax to the 0.9Fmax of described effective lorentz force density F
The frequency of stir current.
According to the described present invention, it is possible to the result according only to electromagnetic field analysis is determined to reduce as much as possible
The optimal electric current frequency of the electromagnetic mixing apparatus of the electromagnetic repulsive force produced during electromagnetic agitation in-mold molten steel
Rate.Thus, it is possible to suppress the bubble of Ar gas to concentrate at blank surface as much as possible such that it is able to enter one
Step suppression pin hole defect.
Certainly, the present invention is not limited to described example, it goes without saying that as long as described in claim
Technological thought in the range of, it is possible to suitably change embodiment.
Inventor utilizes the method shown in non-patent literature 2 to carry out fluid simulation, but self-evident, enters
The method of row hot fluid simulation is not limited to the method described in non-patent literature 2.
Description of reference numerals
11, mold；13, electromagnetic mixing apparatus；13a, iron core core.
Claims (1)
1. a continuous casing for steel, it uses the electromagnetic mixing apparatus being located at mold, its feature
It is,
The lorentz force density composition on parallel direction, limit long with mold will be made as described electromagnetism
The iron core core of the structural element of agitating device exist in the range of equalization and the value that obtains is set to Lx,
The lorentz force density composition made on the direction parallel with mold minor face is deposited at described iron core core
In the case of equalization in the range of and the value that obtains are set to Ly,
Try to achieve the electric current utilizing the calculated effective lorentz force density F of following formula with electromagnetic mixing apparatus
Relation between frequency,
F=Lx-α Ly,
Here, the coefficient that α is the harmful effect degree representing electromagnetic repulsive force, α=3～7, Lx and Ly
Unit be N/m3, the unit of effective lorentz force density F is N/m3, the unit of power frequency is Hz,
Use is from the electromagnetism of the scope of maximum Fmax to the 0.9Fmax of described effective lorentz force density F
The frequency of stir current.
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| 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 |
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| CN106029256B CN106029256B (en) | 2017-10-27 |
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| JP (1) | JP6379515B2 (en) |
| KR (1) | KR101758034B1 (en) |
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| BR (1) | BR112016019404B1 (en) |
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| WO2019164004A1 (en) | 2018-02-26 | 2019-08-29 | 日本製鉄株式会社 | 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 |
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- 2015-01-30 EP EP15754485.9A patent/EP3112051B8/en active Active
- 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
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2015157309A (en) | 2015-09-03 |
| EP3112051A4 (en) | 2017-10-18 |
| EP3112051A1 (en) | 2017-01-04 |
| KR101758034B1 (en) | 2017-07-14 |
| PL3112051T3 (en) | 2019-10-31 |
| WO2015129382A1 (en) | 2015-09-03 |
| JP6379515B2 (en) | 2018-08-29 |
| EP3112051B1 (en) | 2019-05-15 |
| BR112016019404B1 (en) | 2021-05-11 |
| CN106029256B (en) | 2017-10-27 |
| KR20160117586A (en) | 2016-10-10 |
| ES2738484T3 (en) | 2020-01-23 |
| EP3112051B8 (en) | 2019-07-31 |
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