EP1277531A2 - Verfahren und Vorrichtung zum Giessen eines Metallstranges - Google Patents

Verfahren und Vorrichtung zum Giessen eines Metallstranges Download PDF

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Publication number
EP1277531A2
EP1277531A2 EP02447058A EP02447058A EP1277531A2 EP 1277531 A2 EP1277531 A2 EP 1277531A2 EP 02447058 A EP02447058 A EP 02447058A EP 02447058 A EP02447058 A EP 02447058A EP 1277531 A2 EP1277531 A2 EP 1277531A2
Authority
EP
European Patent Office
Prior art keywords
nozzle
metal
inclusions
basket
ingot
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.)
Withdrawn
Application number
EP02447058A
Other languages
English (en)
French (fr)
Other versions
EP1277531A3 (de
Inventor
Paul Naveau
Philippe Joly
René Munnix
Christian Marique
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP1277531A2 publication Critical patent/EP1277531A2/de
Publication of EP1277531A3 publication Critical patent/EP1277531A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/62—Pouring-nozzles with stirring or vibrating means

Definitions

  • the present invention relates to a method for casting a metal ingot having improved quality, especially in the context of disposal of inclusions present in the cast metal in order to obtain a quality ingot improved, said ingot giving birth by its hot or cold transformation to superior quality products. It also relates to a device for putting implementing the method of the invention.
  • the invention can be applied to any casting operation of a ferrous molten metal or non-ferrous, with a view to obtaining an ingot, both in batch processes than continuous.
  • the casting of molten metal, in particular steel, is a technique that has long been used to obtain an ingot.
  • Said technique consists mainly in pouring the metal from a reservoir, for example a pocket, into an intermediate reservoir, called a distribution basket, and from the latter via an element, called a nozzle, into an ingot mold.
  • the distributing basket can be fed by various successive pockets, so as to keep in operation a practically constant level of liquid metal as and when casting operations.
  • Said basket can feed one or more nozzles, which conduct the liquid metal to one or more ingot molds.
  • the presence non-metallic inclusions in the cast metal which are mainly oxides such as SiO2, Al2O3, CaO, MgO, ..., is at the origin of the appearance of defects in the quality of the cast ingot.
  • a common solution to limit the harmful effect of aforementioned inclusions consists in modulating the passage of the liquid metal in the basket distributor so as to impose a sufficiently long residence time on said metal so that a significant settling of the inclusions in question takes place.
  • the inclusions are lighter than liquid metal, for example steel, and that decantation actually means the rise of said inclusions towards the surface of the liquid metal where they can be captured by the slag, which covers the surface of said liquid metal and can optionally be removed from the bath of metal, for example via an overflow chute thus driving out of the metallic bath the decanted inclusions it contains.
  • cover powders are used and / or the flow profile of the cast metal is modified in order to promote the capture of the inclusions, in particular by creating casting conditions promoting the coalescence of the inclusions.
  • these techniques have positive results with regard to the elimination of inclusions, they are all highly detrimental to the economic yield of the casting operation, since they impose increased construction costs for the installations and / or operation.
  • the subject of the present invention is a process for casting quality ingots improved, especially in terms of eliminating inclusions and giving satisfaction even in the case of inclusions of small sizes, thus solving different current problems related to the presence of said inclusions within the solidified ingot got.
  • a method of casting a molten metal in which said liquid metal is passed from a container called a distribution basket to by means of an element called a nozzle towards an ingot mold in which it undergoes a cooling is essentially characterized in that said metal is subjected, preferably steel, when it passes through the aforementioned nozzle in action at least one electromagnetic field, in that we choose the characteristic parameters said electromagnetic field (s), for example their position spatial in relation to the nozzle, their intensity, ..., so as to create an effect of rotation of said metal during its passage through said nozzle, and in that modulates the characteristic parameters of said electromagnetic field (s) rotating so as to optimize an agglomeration effect of the inclusions present in liquid metal, as well as a rising effect of inclusions or clusters of inclusions formed towards the distribution basket.
  • said electromagnetic field for example their position spatial in relation to the nozzle, their intensity, ...
  • a nozzle whose section is of substantially circular shape, said nozzle consisting of at least two parts, the section of the part located near the distributor basket, called upper, being larger than the section of the most close to the ingot mold, called the bottom, we have close to the upper part aforementioned means for generating one or more electromagnetic fields intended to act on the metal passing through the nozzle and give it a movement of rotation, there is preferably arranged within said nozzle, preferably positioned directly before the last lower part, an element, called a dome, which modifies the free passage section for liquid metal and said element is used above to deflect the flow of metal put in rotation, so as to avoid entrainment towards the ingot mold of inclusions or clusters of inclusions, preferably a gas is injected in the metal flow during its passage in the part of the so-called upper nozzle, preferably a gas injection is made directly below said dome and the gas is argon.
  • the previous modality has the advantage of making it possible to combine two actions taking place one at the level of the nozzle and the other at the aforementioned dome, in to optimize conditions favorable to the elimination of inclusions.
  • This approach in which one or more means are used to inject gas in the liquid metal flow, allows implementation in the context of installations currently used for casting ingots, both in continuous mode that discontinuous, which is very favorable for obtaining a settling of the inclusions which prevents clogging of the nozzle.
  • the parameters defining the electromagnetic field (s) are regulated acting on the metal passing through the upper part of the nozzle so as to obtain at the wall of the nozzle an average speed of rotation of between 0.1 and 5 revs / sec, preferably 1 rev / sec. ⁇ 10%.
  • mechanical means are used to modify the internal surface of the nozzle to influence the flow of steel in the nozzle to promote the flow effect of the steel towards the ingot mold, preferably there are inserts on the internal surface of said nozzle.
  • the previous modality creates a set of forces that act on the steel crossing the nozzle, and therefore also on the inclusions therein, so as to promote the flow of steel, the effect of forces due to fields electromagnetic being combined with the mechanical effect of the aforementioned inserts.
  • the subject of the present invention there is between the distribution basket and the entrance of the part upper of the nozzle means to limit transmission to the basket distributor of the rotational movement generated in the liquid metal passing through the upper part of the nozzle, preferably said means are planar elements radially oriented.
  • the ingot mold is a continuous casting ingot mold, preferably the speed of rotation of the liquid metal is modulated as a function of the extraction speed of the continuous ingot.
  • the flow of metal through the nozzle is regulated by means of an element disposed at the outlet of the latter, preferably said element is a gate valve. sliding drawer or sliding gate.
  • the present invention also relates to a device for implementing the method of casting defined in the preceding modalities.
  • the device for implementing the method of casting a metal ingot of improved quality, object of the present invention is essentially characterized in that that it comprises a substantially circular section nozzle made of material refractory, said nozzle having two parts, a first part has a larger section compared to the section of the second part, preferably the first part has a frustoconical hollow volume in its contact with the second part, said second part preferably being of cylindrical shape hollow or tube-shaped, an element is arranged within the nozzle near the inlet of the lower part of said nozzle, preferably positioned in the frustoconical portion and made of refractory material and having a surface convex upstream of the flowing metal and a concave surface downstream of the flow of metal, said element being provided with orifices, preferably these orifices are arranged so as to define channels in contact with the wall of the nozzle, by which the liquid metal passes to the bottom of the nozzle and then from this last towards the ingot mold.
  • a distributor basket (1) supplied by means (not shown) in liquid metal (2), which has a higher level (3).
  • a nozzle (4) which is formed mainly by two parts, the first so-called upper part (5) and the second so-called lower part (6), said lower part (6) feeding in the direction of the arrow a mold (not shown), via a metal flow regulation means, here of the drawer type sliding gate (8).
  • the upper part (5) comprises in its connection with the lower part (6) a frustoconical portion (7).
  • ELM electromagnetic
  • coils (9) intended to generate ELM fields which cause the metal to rotate liquid flowing in the upper part (5).
  • the frustoconical part (7) comprises an element (11) comprising a dome (not shown) oriented towards the distribution basket (1) and provided with means, here openings (not shown) to introduce a gas, often argon, into the liquid metal passing through said element (11) to pass from the upper part (5) to the lower part (6), and this directly in the volume located below said dome.
  • means (15) for introducing gases are arranged in the part of the nozzle between the distribution basket (1) and the element (11).
  • the agglomeration effect obtained by means of the ELM field generates a settling of the inclusions that go back to the distribution basket (1), operation shown schematically by the cone (12) within the upper part (5) of the nozzle, which ends in the ascent (13) of said inclusions towards the free surface (3) of the liquid metal in the distribution basket (1).
  • the injection of gas via the means (15) has the effect of promoting the aforementioned effect of rising (13) of inclusions to the free surface (3) of the liquid metal in the basket distributor (1).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP02447058A 2001-07-05 2002-04-09 Verfahren und Vorrichtung zum Giessen eines Metallstranges Withdrawn EP1277531A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2001/0457A BE1014278A3 (fr) 2001-07-05 2001-07-05 Procede de coulee d'un lingot metallique de qualite amelioree et dispositif pour sa mise en oeuvre.
BE200100457 2001-07-05

Publications (2)

Publication Number Publication Date
EP1277531A2 true EP1277531A2 (de) 2003-01-22
EP1277531A3 EP1277531A3 (de) 2003-01-29

Family

ID=3897048

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02447058A Withdrawn EP1277531A3 (de) 2001-07-05 2002-04-09 Verfahren und Vorrichtung zum Giessen eines Metallstranges

Country Status (2)

Country Link
EP (1) EP1277531A3 (de)
BE (1) BE1014278A3 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006031964A1 (en) * 2004-09-13 2006-03-23 Energetics Technologies, L.L.C. Methods and facilities for suppressing vortices arising in tundishes or ladles during their respective discharge
CN103203450A (zh) * 2013-03-20 2013-07-17 河北三方电气设备有限公司 一种连铸用电磁旋流水口
US9360255B2 (en) 2011-08-29 2016-06-07 Abb Research Ltd. Method and arrangement for vortex reduction in a metal making process
CN111299560A (zh) * 2020-04-08 2020-06-19 河北新兴铸管有限公司 铁水包聚渣装置及聚渣方法
US10875090B2 (en) 2016-12-12 2020-12-29 Abb Schweiz Ag Assembly for a metal-making process
CN118893187A (zh) * 2024-08-26 2024-11-05 中铁北赛电工有限公司 一种铜铬锆合金连铸用电磁调控装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE410284B (sv) * 1978-02-10 1979-10-08 Asea Ab Forfaringssett for omrorning av metalliska smelta samt anordning for genomforande av detta forfaringssett
LU84103A1 (fr) * 1982-04-22 1984-03-02 Arbed Systeme de decrassage automatique de busettes pendant la coulee de metaux
EP0269180B1 (de) * 1986-11-26 1992-01-02 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Vorrichtung zum Giessen eines pastenartigen Metalles
JPH04365809A (ja) * 1991-06-12 1992-12-17 Kawasaki Steel Corp 溶融金属中の非金属介在物除去装置
JPH09295109A (ja) * 1996-04-30 1997-11-18 Nippon Steel Corp 清浄溶湯の連続鋳造法

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006031964A1 (en) * 2004-09-13 2006-03-23 Energetics Technologies, L.L.C. Methods and facilities for suppressing vortices arising in tundishes or ladles during their respective discharge
JP2008513214A (ja) * 2004-09-13 2008-05-01 エナージェティクス テクノロジーズ， エル．エル．シー． タンディッシュまたはとりべのそれぞれの排出の間に、タンディッシュまたはとりべにおいて生じる渦を抑制するための方法および設備
US9360255B2 (en) 2011-08-29 2016-06-07 Abb Research Ltd. Method and arrangement for vortex reduction in a metal making process
CN103203450A (zh) * 2013-03-20 2013-07-17 河北三方电气设备有限公司 一种连铸用电磁旋流水口
US10875090B2 (en) 2016-12-12 2020-12-29 Abb Schweiz Ag Assembly for a metal-making process
CN111299560A (zh) * 2020-04-08 2020-06-19 河北新兴铸管有限公司 铁水包聚渣装置及聚渣方法
CN111299560B (zh) * 2020-04-08 2021-11-30 河北新兴铸管有限公司 铁水包聚渣装置及聚渣方法
CN118893187A (zh) * 2024-08-26 2024-11-05 中铁北赛电工有限公司 一种铜铬锆合金连铸用电磁调控装置

Also Published As

Publication number Publication date
EP1277531A3 (de) 2003-01-29
BE1014278A3 (fr) 2003-07-01

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