EP0771600A1 - Tauchausguss mit Bodenöffnungen zum Einbringen von Metallschmelze in eine Kokille für das Stranggiessen metallischer Produkte - Google Patents

Tauchausguss mit Bodenöffnungen zum Einbringen von Metallschmelze in eine Kokille für das Stranggiessen metallischer Produkte Download PDF

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Publication number
EP0771600A1
EP0771600A1 EP96402025A EP96402025A EP0771600A1 EP 0771600 A1 EP0771600 A1 EP 0771600A1 EP 96402025 A EP96402025 A EP 96402025A EP 96402025 A EP96402025 A EP 96402025A EP 0771600 A1 EP0771600 A1 EP 0771600A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
orifices
liquid metal
metal
mold
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.)
Granted
Application number
EP96402025A
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English (en)
French (fr)
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EP0771600B1 (de
Inventor
Laurent Gacher
Jean-Michel Damasse
Gérard Raisson
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.)
Thyssen Stahl AG
USINOR SA
Original Assignee
Thyssen Stahl AG
USINOR Sacilor SA
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 Thyssen Stahl AG, USINOR Sacilor SA filed Critical Thyssen Stahl AG
Publication of EP0771600A1 publication Critical patent/EP0771600A1/de
Application granted granted Critical
Publication of EP0771600B1 publication Critical patent/EP0771600B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles
    • 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

Definitions

  • the invention relates to the continuous casting of metals, in particular steel. More specifically, it relates to the tubes of refractory material called "nozzles" which, usually, are connected by their upper end to the container serving as a reservoir of liquid metal, and whose lower end plunges into the bath of liquid metal contained in the mold. where the solidification of the metal product should begin.
  • nozzles tubes of refractory material which, usually, are connected by their upper end to the container serving as a reservoir of liquid metal, and whose lower end plunges into the bath of liquid metal contained in the mold. where the solidification of the metal product should begin.
  • the primary role of these nozzles is to protect the jet of liquid metal on its path between the container and the ingot mold from atmospheric oxidation. They also make it possible, thanks to appropriate configurations of their lower end, to favorably orient the flows of liquid metal in the ingot mold so that the solidification of the product takes place under the best possible conditions.
  • the casting can take place in an ingot mold which must give the product a very elongated rectangular section, which usually designates it by the expression "flat product”.
  • This is the case when, in the steel industry, steel is poured in the form of slabs, that is to say products having approximately 1 to 2 m in width and a thickness generally of the order of 20 cm, but which can descend up to a few cm on some recent installations called “thin slab casting machines”.
  • the ingot mold is composed of fixed walls which are energetically cooled on their face which is not in contact with the metal.
  • molds are used, the casting space of which is delimited on its long sides by a pair of internally cooled cylinders with parallel horizontal axes and rotating around these axes in opposite directions, and on its short sides by plates of closure (called side faces) of refractory material applied against the ends of the cylinders.
  • the cylinders can also be replaced by cooled endless belts.
  • the liquid metal flows must be directed homogeneously in the direction of the cylinders, and also in the direction of the short sides of the casting space. It is thus sought, in particular, to obtain a thermal homogenization of the metal so as to attenuate the variations in the solidified thickness along the perimeter of the mold.
  • This thermal homogenization and the stirring of the liquid bath which it requires are particularly crucial in the case of the casting of thin strips, due to the use of the refractory side faces. Indeed, if we did not ensure a forced renewal of the metal surrounding these side faces, this metal would cool abnormally intense. We would then see unwanted metal solidifications appear on the lateral faces, in particular in the vicinity of their zone of contact with the cylinders.
  • This orientation is conventionally obtained by removing the metal from the nozzle by two orifices called "gills", arranged opposite one another on the side wall of the lower part of the nozzle, and not by an orifice. single placed in the bottom of the nozzle.
  • the liquid metal is divided into two recirculation loops. An upper loop comes to lick the surface of the metal present in the casting space before descending along the nozzle, while a lower loop begins by descending along the short side of the mold before going up towards the hearing.
  • the first part is composed of a cylindrical tube, the upper end of which is connected to an orifice in the bottom of the distributor which constitutes the reserve of liquid steel supplying the ingot mold, an orifice which can be closed at will by the operator, partially or totally, thanks to a stopper or a drawer system ensuring the regulation of the metal flow.
  • the cross-section of this orifice depends on the maximum metal flow which can flow inside the nozzle.
  • the second part fixed to the lower end of the preceding tube, for example by screwing, or being integrated therein by construction, is intended to be immersed in the bath of liquid metal present in the mold.
  • This hollow element is composed of a hollow element inside which opens the lower orifice of the preceding cylindrical tube.
  • the interior space of this hollow element has a generally elongated shape, and is oriented substantially perpendicular to the tube.
  • nozzle bottom orifice (s) thus arranged is that the hot metal flowing through each of them tends to be entrained in the ascending part of the lower recirculation loop of the metal flowing through the louvers. Consequently, only a small fraction of this hot metal reaches deep into the central part of the casting space, and the function of thermal homogenization of this space which was assigned to the orifices is not correctly fulfilled.
  • the object of the invention is to propose a configuration of the lower part of the nozzle which effectively allows this thermal uniformity to be obtained using simple nozzle bottom orifices.
  • the subject of the invention is a nozzle for the introduction of liquid metal into a mold for the continuous casting of flat metal products comprising two long sides and two short sides, of the type comprising at its lower end two openings formed on its side wall at the 'opposite one another and intended to send the liquid metal each towards a small side of said mold, and at least two orifices provided in the bottom of said lower end, characterized in that a first group of said orifices is arranged on one side of a longitudinal plane of symmetry of the nozzle including the axes of the gills, and in that a second group of said orifices is arranged on the other side of said plane of symmetry.
  • the invention consists in providing that the orifices are no longer distributed in the longitudinal plane of symmetry of the nozzle, but distributed on either side of this plane of symmetry.
  • the installation for continuous casting of a liquid metal, such as steel, in the form of thin strips shown in FIGS. 1a and 1c comprises, as known, two cylinders 1, 1 ′ with horizontal axes, rotated in direction opposites around their axes and energetically cooled internally. Their cylindrical lateral surfaces 2, 2 'define between them a casting space which is closed laterally by two lateral walls 3, 3' of refractory material applied against the ends 4, 4 'of the cylinders 1, 1'.
  • the liquid metal 5 is introduced into this pouring space via a nozzle 6 connected to a distributor (not shown) containing a reserve of said metal 5.
  • the metal 5 solidifies against the cooled walls 2, 2 ′ of the cylinders 1, 1 'to form skins 7, 7' of increasing thickness which meet at the neck 8, that is to say at the level where the distance between the surfaces 2, 2 'of the cylinders 1, 1' is the smallest, equal to the thickness of the strips that you want to pour. Below the neck 8, we are therefore in the presence of a solidified strip 9 which peels off from the cylinders 1, 1 ′ and is extracted from the installation by a known device not shown.
  • FIGS. 1a and 1c the preferred directions of the flows of the liquid metal 5 are represented by arrows.
  • Figure 1a shows the flows in the longitudinal median plane Ia-Ia of the mold.
  • a first loop 12 initially ascending, returns towards the nozzle 6 by licking the surface 13 of the bath of liquid metal 5 contained in the casting space, and then descends along the nozzle 6.
  • the regions of the casting space situated directly above the nozzle 6 are not mainly supplied only by metal which already has a relatively high residence time in the casting space to its credit, and which, moreover, has circulated in the vicinity of the cylinders 1, 1 ′ and the lateral faces 3, 3 ′.
  • this metal is cooler than it would be desirable to ensure satisfactory thermal uniformity of the casting space.
  • the solidification conditions of the central region of the strip 9 can, for this reason, differ significantly from those which prevailed in its lateral regions which were mainly supplied by hotter liquid metal. Consequently, the solidification structure of the strip 9 is not uniform over the entire width of its core, which can lead to significant inequalities in the mechanical properties of the final product.
  • the casting installation shown in Figures 2a and 2c differs from the previous one in that it is equipped with a nozzle 15 according to the invention, also shown in Figure 2b.
  • This nozzle 15 differs from the previous one in that 'It is equipped not with one but with two vertical bottom holes 16, 16' aligned in a direction substantially perpendicular to the general orientation of the louvers 10, 10 ', as seen in Figure 2b. They are therefore arranged on either side of the plane IIa-IIa which constitutes, for the nozzle 15, a longitudinal plane of symmetry including the axes of the gills 10, 10 '.
  • These bottom holes have for example a diameter of 15 mm, the others conditions of use being identical to those of the previous example.
  • the flows in the casting space are significantly modified, compared to the reference configuration of Figures 1a and 1c.
  • the flows of metal leaving the vents 10, 10 ′ as observed in the median longitudinal plane IIa-IIa of the casting space, there is the first recirculation loop 12 initially ascending.
  • the second recirculation loop 14 initially descending, but as far as it is concerned, the ascent of the main stream of liquid metal 5 occurs substantially earlier than in the reference configuration. This is due to the presence of a third recirculation loop 17, which mainly contains liquid metal 5 from the bottom orifices 16, 16 '.
  • these jets tend to attract liquid metal 5 from the upper zones of the casting space, which further improves the agitation of the bath and its thermal homogeneity.
  • these jets tend to attract liquid metal 5 from the upper zones of the casting space, which further improves the agitation of the bath and its thermal homogeneity.
  • FIGS. 4a and 4b show the case of nozzles as shown in FIGS. 4a and 4b.
  • These nozzles 19 are formed of two main parts made of a refractory material which are here assembled to one another by screwing the first into the second.
  • the first part comprises a cylindrical or substantially cylindrical tube, the interior space of which constitutes the path for the passage of the liquid metal. Its upper part, not shown, is intended to be connected to a continuous casting distributor.
  • the lower end 21 of the tube 20 has a thread 22 on its outer wall, and this thread 22 makes it possible to assemble it to the second part of the nozzle 19.
  • This second part is composed of a hollow element 23 which, in the 'example described and shown, externally has the shape of an inverted T.
  • the interior space of the hollow element 23, also in the shape of an inverted T, thus comprises a cylindrical portion 24 extending the interior space of the tube 20.
  • the upper region of this cylindrical portion 24 comprises a housing 25 with a threaded wall, so as to be able to screw into it the lower end 21 of the tube 20.
  • the cylindrical portion 24 opens into a tubular portion 26 which is substantially perpendicular to it, of approximately square section in the example shown (it being understood that this section may also be rectangular , circular, oval, etc.).
  • Each end of this tubular portion 26 has a hole 27, 27 '.
  • the bottom 28 of the tubular element 26 is equipped with bottom holes 29-35, 29'-35 '. They are aligned in two parallel rows arranged on either side of the vertical plane of symmetry IVa-IVa of the tubular element 26.
  • the axes of the bottom orifices 29-35, 29'-35 ' which face each other are convergent, similar to the example shown in FIGS.
  • the bottom orifices according to the invention are all the more effective as the flows inside the nozzle are regularly distributed and stable over time.
  • Such obstacles are described in application FR 95 11375.
  • the nozzle 19 of FIG. 4a is shown equipped with such an obstacle. It consists of a stack of three perforated pads 36, 37, 38, arranged in the lower part of the housing 25 in which is inserted the lower end 21 of the tube 20.
  • the upper pad 36 and the lower pad 38 have perforations 39 of relatively small dimensions, and the perforations of each pellet are arranged offset from the perforations of the other pellet.
  • the central patch 37 has a single large perforation 40 of diameter slightly smaller than that of the tube 20, and in fact plays a role of spacer separating the other two pellets. This example of obstacle is not, of course, not limiting, and other configurations can be envisaged, and also be applied to other types of nozzles otherwise in accordance with the invention.
  • the nozzles of the type according to the invention can, as described and shown, be used on installations for the continuous casting of thin metal strips between cylinders. However, they can also be used with profit for the continuous casting of metallic flat products with larger sections, such as steel slabs of conventional thickness (about 200 mm) or of thinner thickness.
  • the invention applies to installations for the continuous casting of flat products, the mold of which has a rectangular or substantially rectangular cross section (the dimensions of which can possibly vary over the height of the mold), and the nozzle of which comprises vents sending the liquid metal towards the short sides of the mold.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Nozzles (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP96402025A 1995-10-30 1996-09-25 Tauchausguss mit Bodenöffnungen zum Einbringen von Metallschmelze in eine Kokille für das Stranggiessen metallischer Produkte Expired - Lifetime EP0771600B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9512764 1995-10-30
FR9512764A FR2740367B1 (fr) 1995-10-30 1995-10-30 Busette pour l'introduction d'un metal liquide dans une lingotiere de coulee continue de produits metalliques, dont le fond comporte des orifices

Publications (2)

Publication Number Publication Date
EP0771600A1 true EP0771600A1 (de) 1997-05-07
EP0771600B1 EP0771600B1 (de) 1999-09-15

Family

ID=9484033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96402025A Expired - Lifetime EP0771600B1 (de) 1995-10-30 1996-09-25 Tauchausguss mit Bodenöffnungen zum Einbringen von Metallschmelze in eine Kokille für das Stranggiessen metallischer Produkte

Country Status (23)

Country Link
US (1) US5840206A (de)
EP (1) EP0771600B1 (de)
JP (1) JPH09122856A (de)
CN (1) CN1068807C (de)
AT (1) ATE184526T1 (de)
AU (1) AU711242B2 (de)
BR (1) BR9605365A (de)
CA (1) CA2188741A1 (de)
CZ (1) CZ286296B6 (de)
DE (1) DE69604260T2 (de)
DK (1) DK0771600T3 (de)
ES (1) ES2137642T3 (de)
FR (1) FR2740367B1 (de)
GR (1) GR3032049T3 (de)
MX (1) MX9605211A (de)
PL (1) PL181293B1 (de)
RO (1) RO117158B1 (de)
RU (1) RU2165825C2 (de)
SK (1) SK282201B6 (de)
TR (1) TR199600839A2 (de)
TW (1) TW316861B (de)
UA (1) UA41991C2 (de)
ZA (1) ZA969070B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2763524A1 (fr) * 1997-05-23 1998-11-27 Vesuvius France Sa Installation pour la coulee continue d'un metal liquide, et organe pour cette installation
FR2769862A1 (fr) * 1997-10-20 1999-04-23 Usinor Busette de coulee pour installation de coulee continue des metaux, notamment de coulee entre cylindres
EP0950451A1 (de) * 1998-04-16 1999-10-20 Usinor Giessdüse zum Einführen von Metallschmelze in eine Strangiesskokille
FR2818567A1 (fr) * 2000-12-22 2002-06-28 Usinor Busette equipee d'une reglette pour l'introduction de metal liquide dans une lingotiere de coulee continue des metaux
EP2100676A1 (de) * 2008-12-17 2009-09-16 Kovác, Peter Stranggiessverfahren

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5335648A (en) * 1976-09-16 1978-04-03 Matsushita Electric Ind Co Ltd Electric power source for dc arc welding
CH691762A5 (de) 2000-06-28 2001-10-15 Main Man Inspiration Ag Zwischenbehälter mit einer feuerfesten Giessrohreinheit für das Abgiessen von Metallschmelze in eine Bandgiessmaschine sowie eine Giessrohreinheit.
US7690417B2 (en) * 2001-09-14 2010-04-06 Nucor Corporation Thin cast strip with controlled manganese and low oxygen levels and method for making same
JP2005230826A (ja) * 2004-02-17 2005-09-02 Ishikawajima Harima Heavy Ind Co Ltd 溶湯供給ノズル
US7926549B2 (en) * 2007-01-19 2011-04-19 Nucor Corporation Delivery nozzle with more uniform flow and method of continuous casting by use thereof
US7926550B2 (en) * 2007-01-19 2011-04-19 Nucor Corporation Casting delivery nozzle with insert
RU2359782C2 (ru) 2007-07-04 2009-06-27 Техком Гмбх Погружной стакан
US8047264B2 (en) * 2009-03-13 2011-11-01 Nucor Corporation Casting delivery nozzle
US8813828B2 (en) 2011-12-09 2014-08-26 Nucor Corporation Casting delivery nozzle
CN108883462A (zh) * 2016-03-25 2018-11-23 诺维尔里斯公司 直接激冷铸造中的液态金属射流优化
JP7230597B2 (ja) * 2019-03-11 2023-03-01 日本製鉄株式会社 注湯ノズル、双ロール式連続鋳造装置、及び、薄肉鋳片の製造方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2233121A1 (de) * 1973-06-14 1975-01-10 Voest Ag
JPS6021171A (ja) * 1983-07-16 1985-02-02 Nisshin Steel Co Ltd 幅広薄板連続鋳造装置
GB2187404A (en) * 1986-03-05 1987-09-09 Didier Werke Ag Immersion tube
JPH01266950A (ja) * 1988-04-18 1989-10-24 Nkk Corp 連続鋳造方法
EP0401144A1 (de) * 1989-05-31 1990-12-05 Institut De Recherches De La Siderurgie Francaise (Irsid) Vorrichtung und Verfahren zur Zuführung flüssigen Metalls an einer Stranggiessanlage für dünne metallische Produkte
JPH06600A (ja) * 1992-06-15 1994-01-11 Hitachi Zosen Corp 移動鋳型壁を持つ連続鋳造設備における注湯ノズル
FR2700283A1 (fr) * 1993-01-12 1994-07-13 Lorraine Laminage Busette immergée pour la coulée continue des métaux.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH557707A (de) * 1973-05-07 1975-01-15 Concast Ag Vorrichtung zum einbringen einer stahlschmelze in den giesskopf einer stranggiesskokille.
AT400935B (de) * 1994-07-25 1996-04-25 Voest Alpine Ind Anlagen Tauchgiessrohr

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2233121A1 (de) * 1973-06-14 1975-01-10 Voest Ag
JPS6021171A (ja) * 1983-07-16 1985-02-02 Nisshin Steel Co Ltd 幅広薄板連続鋳造装置
GB2187404A (en) * 1986-03-05 1987-09-09 Didier Werke Ag Immersion tube
JPH01266950A (ja) * 1988-04-18 1989-10-24 Nkk Corp 連続鋳造方法
EP0401144A1 (de) * 1989-05-31 1990-12-05 Institut De Recherches De La Siderurgie Francaise (Irsid) Vorrichtung und Verfahren zur Zuführung flüssigen Metalls an einer Stranggiessanlage für dünne metallische Produkte
JPH06600A (ja) * 1992-06-15 1994-01-11 Hitachi Zosen Corp 移動鋳型壁を持つ連続鋳造設備における注湯ノズル
FR2700283A1 (fr) * 1993-01-12 1994-07-13 Lorraine Laminage Busette immergée pour la coulée continue des métaux.

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* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 142 (M - 388) 18 June 1985 (1985-06-18) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 026 (M - 921) 18 January 1990 (1990-01-18) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 190 (M - 1586) 31 March 1994 (1994-03-31) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2763524A1 (fr) * 1997-05-23 1998-11-27 Vesuvius France Sa Installation pour la coulee continue d'un metal liquide, et organe pour cette installation
FR2769862A1 (fr) * 1997-10-20 1999-04-23 Usinor Busette de coulee pour installation de coulee continue des metaux, notamment de coulee entre cylindres
EP0911096A1 (de) * 1997-10-20 1999-04-28 Usinor Giessdüse für Metallstranggiessvorrichtung, insbesondere für Walzgiessmaschine
EP0950451A1 (de) * 1998-04-16 1999-10-20 Usinor Giessdüse zum Einführen von Metallschmelze in eine Strangiesskokille
FR2777485A1 (fr) * 1998-04-16 1999-10-22 Usinor Busette pour l'indroduction de metal liquide dans une lingotiere de coulee continue des metaux
US6092700A (en) * 1998-04-16 2000-07-25 Usinor Nozzle for introducing liquid metal into a mold for the continuous casting of metals
CN1103255C (zh) * 1998-04-16 2003-03-19 于西纳公司 将金属液注入用于金属连铸铸模的浇铸嘴
FR2818567A1 (fr) * 2000-12-22 2002-06-28 Usinor Busette equipee d'une reglette pour l'introduction de metal liquide dans une lingotiere de coulee continue des metaux
WO2002051569A1 (fr) * 2000-12-22 2002-07-04 Usinor Busette equipee d'une reglette pour l'introduction de metal liquide dans une lingotiere de coulee continue des metaux
EP2100676A1 (de) * 2008-12-17 2009-09-16 Kovác, Peter Stranggiessverfahren

Also Published As

Publication number Publication date
RO117158B1 (ro) 2001-11-30
SK138696A3 (en) 1998-02-04
RU2165825C2 (ru) 2001-04-27
DK0771600T3 (da) 2000-04-03
AU6800396A (en) 1997-05-08
PL316718A1 (en) 1997-05-12
CA2188741A1 (fr) 1997-05-01
US5840206A (en) 1998-11-24
SK282201B6 (sk) 2001-12-03
JPH09122856A (ja) 1997-05-13
ZA969070B (en) 1997-05-29
UA41991C2 (uk) 2001-10-15
AU711242B2 (en) 1999-10-07
ES2137642T3 (es) 1999-12-16
TR199600839A2 (xx) 1998-05-21
PL181293B1 (pl) 2001-07-31
BR9605365A (pt) 1998-07-28
FR2740367B1 (fr) 1997-11-28
CN1068807C (zh) 2001-07-25
DE69604260D1 (de) 1999-10-21
CZ312096A3 (en) 1997-05-14
CN1157197A (zh) 1997-08-20
TW316861B (de) 1997-10-01
ATE184526T1 (de) 1999-10-15
GR3032049T3 (en) 2000-03-31
MX9605211A (es) 1997-06-28
FR2740367A1 (fr) 1997-04-30
DE69604260T2 (de) 2003-02-13
EP0771600B1 (de) 1999-09-15
CZ286296B6 (cs) 2000-03-15

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