KR20160139636A - Mold flux and method of continuous casting of steel using the same - Google Patents

Mold flux and method of continuous casting of steel using the same Download PDF

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Publication number
KR20160139636A
KR20160139636A KR1020150074872A KR20150074872A KR20160139636A KR 20160139636 A KR20160139636 A KR 20160139636A KR 1020150074872 A KR1020150074872 A KR 1020150074872A KR 20150074872 A KR20150074872 A KR 20150074872A KR 20160139636 A KR20160139636 A KR 20160139636A
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KR
South Korea
Prior art keywords
mold
mold flux
particles
flux
metal
Prior art date
Application number
KR1020150074872A
Other languages
Korean (ko)
Inventor
조중욱
Original Assignee
포항공과대학교 산학협력단
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Application filed by 포항공과대학교 산학협력단 filed Critical 포항공과대학교 산학협력단
Priority to KR1020150074872A priority Critical patent/KR20160139636A/en
Publication of KR20160139636A publication Critical patent/KR20160139636A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10Supplying or treating molten metal
    • B22D11/108Feeding additives, powders, or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/07Lubricating the moulds
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/076Use of slags or fluxes as treating agents
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Process efficiency
    • Y02P10/21Process efficiency by recovering materials
    • Y02P10/242Slag reuse in metallurgical processes

Abstract

The mold flux according to an exemplary embodiment of the present invention is used in continuous casting, wherein the mold flux is formed by adding metal particles or ceramic particles to block radiation emitted from the coagulation cells in the mold, The metal particles or the ceramic particles are injected together with the molten mold flux dissolved from the outside of the mold into the mold bath surface to be efficiently dispersed into the slag.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold flux and a continuous casting method using the same,

The present invention relates to a mold flux and a continuous casting method using the same, and more particularly, to a mold flux used in a continuous casting process of steel and a continuous casting method using the same.

The continuous casting process of steel has been widely used worldwide since the 1960s, and is a widely used process because it has many advantages such as improved productivity and yield compared to the ingot casting process which has been performed before. In the continuous casting process, the quality and productivity of the cast steel are determined by controlling the solidification in the mold.

When the molten steel flows into the mold from the tundish serving as a buffer, through the immersion nozzle, solidification starts from the meniscus, which is the portion where the molten steel and the mold abut.

At this time, when the solidification cell formed by solidification comes into direct contact with the mold, the solidification cell can be ruptured due to the friction between the solidification cell and the mold. Therefore, a mold flux serving as a lubricant is injected between the mold wall and the solidification cell.

In the continuous casting process, the mold flux applied to the bath surface is dissolved in the sensible heat of the bath surface molten steel, then flows into the mold wall surface from the meniscus portion and is present as a slag film. A solid film is present near the mold wall surface, There is a liquid film. Such a mold flux controls the rate of heat transfer from the molten steel to the mold wall surface, and has a lubricating ability.

The heat transfer through the liquid film and the solid film consists of two paths, conduction and radiation, respectively, and there are five kinds of heat resistance related to the slag film including the interface thermal resistance.

If the total heat becomes larger than a certain amount in the initial solidification step in the mold, that is, in the solidification step near the meniscus, a cracking defect occurs on the surface portion, which deteriorates the quality of the final product, A breakout may occur in which the molten steel exits through a crack and explodes.

Therefore, there is a need for a so-called initial complete cooling technique which lowers the amount of heat in the initial solidification step in an efficient manner. In the conventional operation, the heat resistance of the solid film was increased to lower the amount of heat in the initial solidification step. That is, a solid phase slag film having a high crystalline fraction is formed in the vicinity of the meniscus to shield radiation passing therethrough. However, when this method is applied, the fluidity of the solid film tends to deteriorate, so that the rupture of the solid film and the lubricating ability between the mold and the solidifying shell may be deteriorated.

Korean Patent Registration No. 10-0749027

The mold flux and the continuous casting method using the same according to an embodiment of the present invention are intended to solve the above-mentioned problems.

In order to effectively achieve the effective injection of the metal or ceramic particles of the liquid mold flux and the effective distribution of the particles into the liquid mold flux film at the mold wall surface finally, A metal mold or a ceramic mold is injected into an injection tube into which a molten mold flux is injected based on a so-called molten mold flux injection technique of injecting mold flux melted outside the mold into a mold, And finally effectively dispersing the metal or ceramic particles in the liquid mold flux film present on the wall surface of the mold, thereby effectively shielding the radiation wave emitted from the solidifying shell, and a continuous casting It is how to provide.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an apparatus and method for controlling the same.

A mold flux according to an embodiment of the present invention is a mold flux used for continuous casting in which a metal particle or a ceramic material particle is added in order to block radiation emitted from a coagulation cell in a mold .

The mold flux may be melted outside the mold, and then the metal particles or the ceramic particles may be added.

The mold flux may be blown by the metal particles or the ceramic particles.

The mold flux may be fed with particles of the metal material or particles of the ceramic material.

According to an embodiment of the present invention, there is provided a continuous casting method using a mold flux, comprising: injecting a mold flux into which a metal particle or a ceramic material particle is added to block a radiation emitted from a coagulation cell in a mold; And solidifying the mold flux.

The mold flux and the continuous casting method using the same according to an embodiment of the present invention are characterized in that the metal or ceramic particles are uniformly dispersed in the liquid mold flux film so that the radiant energy emitted from the surface of the solidification cell is transferred to the mold The effect can be effectively blocked.

Further, the total amount of heat in the mold, particularly, the amount of heat in the initial solidification step can be effectively reduced, and at the same time, the lubricating ability between the solidification cell and the mold can be improved in the continuous casting mold.

The effects of the present invention are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

1 is a schematic view schematically showing metallurgical phenomena occurring in a mold in a continuous casting process,
Fig. 2 is a view schematically showing heat transfer in a mold in the continuous casting process of Fig. 1,
3 is a schematic view of a device for adding metal or ceramic particles to a mold flux according to an embodiment of the present invention,
4 is a view sequentially showing a continuous casting method using a mold flux according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings, wherein like or similar elements are denoted by the same reference numerals, and redundant description thereof will be omitted. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. It is to be noted that the accompanying drawings are only for the purpose of facilitating understanding of the present invention and should not be construed as limiting the scope of the present invention.

3 is a schematic view of an apparatus for adding metal or ceramic particles to a mold flux according to an embodiment of the present invention.

The mold can be divided into a mold top surface and a mold wall surface in the mold. In the mold surface, there is always a constant flow of molten steel. On the mold wall surface, the vibrating mold wall surface and the constant casting speed The shear rate is determined by the relative velocity difference between the solidified cells flowing downward.

In this embodiment, the mold flux is added with metal particles or ceramic particles to block radiation emitted from the coagulation cells in the mold. Specifically, metal particles or ceramic particles having a higher density than the mold flux corresponding to the liquid phase mold flux among the slag films formed on the mold wall surface are added.

When metal or ceramic particles are added and dispersed in a liquid mold flux film, the radiation energy emitted from the surface of the solidifying cell can be effectively prevented from being transferred to the mold. As a result, it is possible to effectively reduce the total amount of heat in the mold, in particular, the heat transfer in the initial solidification step, and at the same time, improve the lubricating ability between the solidification cell and the mold in the continuous casting mold.

It is preferable that the metal or ceramic particles are uniformly dispersed in the liquid-phase mold flux film.

First, in order to produce a dispersion form of the solid phase particles and the liquid mold flux, the liquid phase mold flux is melted outside the mold, and then injected into the mold melt surface through the first injection pipe 110. Then, the metal or ceramic particles are added to the first injection tube 110. Thereafter, the metal or ceramic particles dispersed in the slag pool of the casting mold surface flow into the slag of the mold wall surface and move to the mold wall surface, and are uniformly dispersed in the liquid slag film of the mold wall surface.

In this embodiment, the particles of metal or ceramic material are blown or fed.

For example, the powder contained in the powder chamber 130 may be introduced into the nozzle of the molten mold flux together with the carrier gas through the second injection tube 120, or the powder may be formed into a wire form and fed. Accordingly, metal or ceramic particles can be uniformly dispersed and added to the inside of the liquid mold film.

As a result, it has been found that if the radiation heat transfer through the liquid slag film is remarkably suppressed, the heat transfer amount in the mold can be effectively lowered without any side effects. That is, when the radiative heat transfer blocking effect performed by the solid phase slag film in the conventional operation method is implemented through the liquid slag film, since the heat content can be controlled even if the crystalline fraction in the solid phase slag film is kept low, The problem of lowering the lubricating ability caused by the above problems does not occur.

Therefore, when a mold flux product that forms a liquid slag film capable of blocking radiative heat transfer is applied to crack-sensitive steel continuous casting, it is possible to satisfactorily control both heat transfer and lubrication in the mold, thereby remarkably improving the efficiency of the continuous casting process . It is characterized by forming a liquid slag film containing fine particles with appropriate density, number and size distribution so as to effectively dissipate the radiant energy emitted from the surface of solidified steel (solidification shell) in the continuous casting mold and to block radiative heat transfer The mold flux for continuous casting has been proposed.

However, since no specific method of how to form such a liquid-phase mold flux film containing fine particles has been proposed, it is necessary to effectively introduce metal or ceramic fine particles into the liquid-phase mold flux, The effective distribution of the particles into the mold flux film and the radiation heat transfer through the liquid mold flux film must be effectively blocked. For this purpose, based on a so-called molten mold flux injection technique of injecting molten mold flux outside the mold, metal or ceramic particles are injected into the injection pipe into which the molten mold flux is injected, and the molten mold flux is dispersed in the molten mold flux, Finally, the metal or ceramic particles are effectively dispersed in the liquid mold flux film existing on the wall surface of the mold, thereby effectively shielding the radiation wave emitted from the solidified shell.

4 is a flowchart sequentially illustrating a continuous casting method using a mold flux according to an embodiment of the present invention.

A continuous casting method using a mold flux according to an embodiment of the present invention includes a step (S100) of injecting a mold flux into a mold and a step (S200) of solidifying the mold flux.

In step S100 of injecting the mold flux into the mold, a mold flux into which a metal particle or ceramic particle is added is injected into the mold in order to block radiation emitted from the coagulation cell in the mold. First, the mold flux is melted outside the mold and then injected into the mold bath surface. Thereafter, metal or ceramic particles are added. Thus, the metal or ceramic particles can be uniformly dispersed in the liquid slag film on the wall surface of the mold.

The step of solidifying the mold flux (S200) increases the heat resistance of the mold flux, reduces the amount of heat, and solidifies the mold flux.

In this embodiment, the metal or ceramic particles are blown or fed with metal or ceramic particles. For example, the powder may be fed into the nozzle of the molten mold flux with the carrier gas, or the powder may be prepared in wire form and fed. Accordingly, metal or ceramic particles can be uniformly dispersed and added to the inside of the liquid mold film.

The embodiments and the accompanying drawings described in the present specification are merely illustrative of some of the technical ideas included in the present invention. Therefore, it is to be understood that the embodiments disclosed herein are not for purposes of limiting the technical idea of the present invention, but are intended to be illustrative, and thus the scope of the technical idea of the present invention is not limited by these embodiments. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. It should be interpreted.

110: first injection tube
120: second injection tube
130: Powder chamber

Claims (8)

  1. In the mold flux used for continuous casting,
    Wherein the mold flux is a metal particle or a ceramic material particle added to block radiation emitted from a solidifying cell in the mold.
  2. The method according to claim 1,
    Wherein the mold flux is melted outside the mold and then the metal particles or the ceramic material particles are added.
  3. The method according to claim 1,
    Wherein the mold flux is blown by particles of the metal material or particles of the ceramic material.
  4. The method according to claim 1,
    Wherein the mold flux is fed with particles of the metal material or particles of the ceramic material.
  5. Injecting a mold flux into which a metal particle or a ceramic material is added to block radiation emitted from the solidifying cell in the mold; And
    And then solidifying the mold flux.
  6. 6. The method of claim 5,
    Wherein the mold flux is melted outside the mold, and then the metal particles or the ceramic material particles are added.
  7. 6. The method of claim 5,
    Wherein the mold flux is a mold flux in which particles of the metal material or particles of the ceramic material are blown.
  8. 6. The method of claim 5,
    Wherein the mold flux is fed with particles of the metal material or particles of the ceramic material.
KR1020150074872A 2015-05-28 2015-05-28 Mold flux and method of continuous casting of steel using the same KR20160139636A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100749027B1 (en) 2006-06-23 2007-08-07 주식회사 포스코 Continuous casting machine and method using molten mold flux

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100749027B1 (en) 2006-06-23 2007-08-07 주식회사 포스코 Continuous casting machine and method using molten mold flux

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