EP0771600B1 - Busette pour l'introduction d'un métal liquide dans une lingotière de coulée continue de produits métalliques, dont le fond comporte des orifices - Google Patents

Busette pour l'introduction d'un métal liquide dans une lingotière de coulée continue de produits métalliques, dont le fond comporte des orifices Download PDF

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Publication number
EP0771600B1
EP0771600B1 EP96402025A EP96402025A EP0771600B1 EP 0771600 B1 EP0771600 B1 EP 0771600B1 EP 96402025 A EP96402025 A EP 96402025A EP 96402025 A EP96402025 A EP 96402025A EP 0771600 B1 EP0771600 B1 EP 0771600B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
metal
liquid metal
mould
holes
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.)
Expired - Lifetime
Application number
EP96402025A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0771600A1 (fr
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 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 SA filed Critical Thyssen Stahl AG
Publication of EP0771600A1 publication Critical patent/EP0771600A1/fr
Application granted granted Critical
Publication of EP0771600B1 publication Critical patent/EP0771600B1/fr
Anticipated expiration legal-status Critical
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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 tubes made of refractory material called "nozzles" which, usually are connected by their upper end to the container used for liquid metal reservoir, the lower end of which dips into the metal bath liquid contained in the ingot mold where the solidification of the product must begin metallic.
  • nozzles tubes made of refractory material which, usually are connected by their upper end to the container used for liquid metal reservoir, the lower end of which dips into the metal bath liquid contained in the ingot mold where the solidification of the product must begin metallic.
  • the primary role of these nozzles is to protect from oxidation atmospheric the jet of liquid metal on its path between the container and the mold. They also allow, thanks to appropriate configurations of their end lower, to favorably direct the flow of liquid metal in the 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 under slab shape, i.e. products about 1 to 2 m wide and a thickness generally of the order of 20 cm, but which can go down to a few cm on certain 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 metal. We are also experimenting with installations making it possible to obtain, directly by solidification of the liquid metal, steel strips a few mm thick.
  • the casting space is delimited on its long sides by a pair of cooled cylinders internally with parallel horizontal axes and rotating around these axes in a direction inverses, and on its short sides by closing plates (called lateral faces) made of refractory material applied against the ends of the cylinders.
  • Cylinders can also be replaced by cooled endless belts.
  • This orientation is conventionally obtained by removing the metal from the nozzle through two orifices called "gills", arranged opposite one another on the side wall of the lower part of the nozzle, and not through a single hole placed in the bottom of the nozzle.
  • the metal liquid 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 hearing.
  • the first part is composed of a cylindrical tube whose upper end is connected to an opening in the bottom of the distributor which constitutes the reserve of liquid steel feeding the ingot mold, 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 section of this orifice depends on the flow maximum of metal that can flow inside the nozzle.
  • the second part fixed at the lower end of the preceding tube, for example by screwing, or being integrated therein of construction, is intended to be immersed in the bath of liquid metal present in the ingot 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 metal recirculation loop flowing through the vents. In as a result only a small fraction of this hot metal gets deep into the central part of the pouring space, and the thermal homogenization function of this space that was assigned to the ports is not properly filled.
  • the object of the invention is to propose a configuration of the lower part of the nozzle which effectively makes it possible to obtain this thermal homogeneity using simple nozzle bottom holes.
  • the subject of the invention is a nozzle for the introduction of liquid metal into an ingot mold for continuous casting of flat metal products comprising two large sides and two short sides, of the type comprising at its lower end two gills formed on its side wall opposite one another and intended to send the metal each liquid towards a small side of said mold, and at least two openings in the bottom of said lower end, characterized in that a first group of said orifices is disposed 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 disposed 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 continuous casting installation of a liquid metal, such as steel, in the form thin strips shown in Figures 1a and 1c comprises, as known, two cylinders 1, 1 'with horizontal axes, rotated in opposite directions around their axles and energetically cooled internally. Their cylindrical lateral surfaces 2, 2 'define between them a pouring space which is closed laterally by two side 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 casting space by 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, i.e. 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 one wishes to pour.
  • FIGS. 1a and 1c the preferred directions of the flows of the metal liquid 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 liquid metal 5 contained in the casting space, and then descends along the nozzle 6.
  • the regions of the casting space located at the plumb of the nozzle 6 are mainly powered only by metal which has already to his credit a relatively high residence time in the casting space, which, plus, circulated in the vicinity of the cylinders 1, 1 'and the lateral faces 3, 3'. For these reasons, this metal is cooler than it would be desirable to ensure homogeneity satisfactory thermal performance of the casting space.
  • the solidification conditions of the central region of the strip 9 may, for this reason, differ significantly from those that prevailed in its lateral regions which have were mainly supplied by hotter liquid metal. Consequently, the band solidification structure 9 is not uniform over the entire width of its core, which can lead to significant inequalities in mechanical properties of the final product.
  • the casting installation shown in Figures 2a and 2c differs from the previous in that it is equipped with a nozzle 15 according to the invention, shown also 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 openings 10, 10 ', as seen in Figure 2b. They are therefore arranged on either side of the IIa-IIa plane who constitutes, for the nozzle 15, a longitudinal plane of symmetry including the axes of the vents 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.
  • these jets tend to attract liquid metal 5 from the upper areas 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 areas of the casting space, which further improves the agitation of the bath and its thermal homogeneity.
  • nozzles 19 are formed of two parts main refractory materials which are assembled here by screwing from the first to the second.
  • the first part comprises a cylindrical tube 20 or substantially cylindrical, the interior space of which constitutes the passageway for 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. Space inside 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 zone of this cylindrical portion 24 comprises a housing 25 with a threaded wall, so as to ability to screw the lower end 21 of the tube 20 into it.
  • the cylindrical portion 24 opens into a tubular portion 26 which is substantially perpendicular thereto, approximately square section in the example shown (it being understood that this section can 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 orifices 29-35, 29'-35 '. They are aligned according 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 'facing each other are convergent, similar to the example shown in Figures 3a, 3b, 3c, but one can also imagine drilling these same bottom holes 29-35, 29'-35 'simply vertically.
  • the invention applies in the same way if one confers on the interior space of the element hollow 23 a shape different from that of a simple inverted T, the main thing being that this interior space ends with an elongated portion that can be oriented parallel to the long sides of the mold, and at the ends of which spared gills.
  • the bottom orifices according to the invention are all the more effective as the flows inside the nozzle are regularly distributed and stable in the time.
  • obstacles are described in application FR 95 11375.
  • the nozzle 19 of Figure 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 into which is inserted the lower end 21 of the tube 20.
  • the pellet upper 36 and the lower pad 38 have relatively small perforations 39 dimensions, and the perforations of each patch are arranged in an offset manner by compared to the perforations of the other patch.
  • the middle patch 37 has a wide single perforation 40 of diameter slightly smaller than that of the tube 20, and plays, in done, a role of spacer separating the two other pellets. This example of obstacle is not, of course, not limiting, and other configurations can be envisaged, and be also applied to other types of nozzles otherwise conforming to the invention.
  • the nozzles of the type according to the invention can, as described and shown, to be used on continuous casting systems for metal strips thin between cylinders. But they can also be used profitably for casting continuous flat metal products with larger sections, such as slabs steel of conventional thickness (approximately 200 mm) or of thinner thickness. So general, the invention applies to installations for 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 has vents sending the liquid metal towards the small sides of the mold.

Landscapes

  • 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 Busette pour l'introduction d'un métal liquide dans une lingotière de coulée continue de produits métalliques, dont le fond comporte des orifices Expired - Lifetime EP0771600B1 (fr)

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 EP0771600A1 (fr) 1997-05-07
EP0771600B1 true EP0771600B1 (fr) 1999-09-15

Family

ID=9484033

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96402025A Expired - Lifetime EP0771600B1 (fr) 1995-10-30 1996-09-25 Busette pour l'introduction d'un métal liquide dans une lingotière de coulée continue de produits métalliques, dont le fond comporte des orifices

Country Status (23)

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

Families Citing this family (16)

* 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
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
FR2769862B1 (fr) * 1997-10-20 1999-11-19 Usinor Busette de coulee pour installation de coulee continue des metaux, notamment de coulee entre cylindres
FR2777485B1 (fr) * 1998-04-16 2000-05-19 Usinor Busette pour l'indroduction de metal liquide dans une lingotiere de coulee continue des metaux
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.
FR2818567B1 (fr) * 2000-12-22 2003-03-28 Usinor Busette equipee d'une reglette pour l'introduction de metal liquide dans une lingotiere de coulee continue des metaux
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
US7926550B2 (en) * 2007-01-19 2011-04-19 Nucor Corporation Casting delivery nozzle with insert
US7926549B2 (en) * 2007-01-19 2011-04-19 Nucor Corporation Delivery nozzle with more uniform flow and method of continuous casting by use thereof
RU2359782C2 (ru) 2007-07-04 2009-06-27 Техком Гмбх Погружной стакан
ES2388900T3 (es) * 2008-12-17 2012-10-19 Kovac, Peter Procedimiento de colada continua
US8047264B2 (en) * 2009-03-13 2011-11-01 Nucor Corporation Casting delivery nozzle
EP2788134A4 (en) 2011-12-09 2016-03-16 Nucor Corp CASTING DISTRIBUTION NOZZLE
US20170274446A1 (en) * 2016-03-25 2017-09-28 Novelis Inc. Liquid metal jet optimization in direct chill casting
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

Family Cites Families (9)

* 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.
AT331438B (de) * 1973-06-14 1976-08-25 Voest Ag Kontinuierliches stahlstranggiessverfahren sowie anlage zur durchfuhrung des verfahrens
JPS6021171A (ja) * 1983-07-16 1985-02-02 Nisshin Steel Co Ltd 幅広薄板連続鋳造装置
DE3607104C1 (de) * 1986-03-05 1987-08-27 Didier Werke Ag Tauchrohr
JPH01266950A (ja) * 1988-04-18 1989-10-24 Nkk Corp 連続鋳造方法
FR2647698A1 (fr) * 1989-05-31 1990-12-07 Siderurgie Fse Inst Rech Dispositif d'alimentation en metal liquide d'une installation de coulee continue de produits minces et procede pour sa mise en oeuvre
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
FR2700283B1 (fr) * 1993-01-12 1995-02-10 Lorraine Laminage Busette immergée pour la coulée continue des métaux.
AT400935B (de) * 1994-07-25 1996-04-25 Voest Alpine Ind Anlagen Tauchgiessrohr

Also Published As

Publication number Publication date
MX9605211A (es) 1997-06-28
RU2165825C2 (ru) 2001-04-27
UA41991C2 (uk) 2001-10-15
DE69604260D1 (de) 1999-10-21
GR3032049T3 (en) 2000-03-31
ATE184526T1 (de) 1999-10-15
AU711242B2 (en) 1999-10-07
US5840206A (en) 1998-11-24
FR2740367B1 (fr) 1997-11-28
ES2137642T3 (es) 1999-12-16
CN1157197A (zh) 1997-08-20
TR199600839A2 (xx) 1998-05-21
CZ286296B6 (cs) 2000-03-15
ZA969070B (en) 1997-05-29
SK138696A3 (en) 1998-02-04
RO117158B1 (ro) 2001-11-30
AU6800396A (en) 1997-05-08
FR2740367A1 (fr) 1997-04-30
PL316718A1 (en) 1997-05-12
EP0771600A1 (fr) 1997-05-07
PL181293B1 (pl) 2001-07-31
TW316861B (es) 1997-10-01
JPH09122856A (ja) 1997-05-13
DK0771600T3 (da) 2000-04-03
CA2188741A1 (fr) 1997-05-01
SK282201B6 (sk) 2001-12-03
DE69604260T2 (de) 2003-02-13
CN1068807C (zh) 2001-07-25
CZ312096A3 (en) 1997-05-14
BR9605365A (pt) 1998-07-28

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