EP4374986A1 - Installation de coulée continue, en particulier pour la coulée de produits longs métallurgiques, ainsi qu'une buse de coulée - Google Patents

Installation de coulée continue, en particulier pour la coulée de produits longs métallurgiques, ainsi qu'une buse de coulée Download PDF

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Publication number
EP4374986A1
EP4374986A1 EP22209627.3A EP22209627A EP4374986A1 EP 4374986 A1 EP4374986 A1 EP 4374986A1 EP 22209627 A EP22209627 A EP 22209627A EP 4374986 A1 EP4374986 A1 EP 4374986A1
Authority
EP
European Patent Office
Prior art keywords
pouring
mold
pouring tube
tube
cross
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.)
Pending
Application number
EP22209627.3A
Other languages
German (de)
English (en)
Inventor
Stephan Feldhaus
Marcel Meier
Frank Tillenkamp
Lorenz BRENNER
Mirco GANZ
Martin Schneider
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.)
SMS Concast AG
Original Assignee
SMS Concast AG
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 SMS Concast AG filed Critical SMS Concast AG
Priority to EP22209627.3A priority Critical patent/EP4374986A1/fr
Publication of EP4374986A1 publication Critical patent/EP4374986A1/fr
Pending legal-status Critical Current

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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
    • 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
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • 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 a continuous casting plant, in particular for the production of metallic long products, which has a metallurgical vessel with at least one pouring spout, a pouring pipe connected thereto with a flow opening and a mold for producing the cast strand, wherein the mold is provided with a mold cavity cross-section in billet format or smaller.
  • the invention also relates to a pouring pipe for such a plant.
  • pouring tubes which are made of a refractory material, are usually provided with an approximately cylindrical cross-section in the case of a round, square or rectangular mold cavity cross-section, such as in the case of billet, bloom, beam blank or round formats, where the outlet runs in the axial direction of the mold.
  • the mold cavity cross-section of the continuous casting mold is preferably formed as a four-round format, in which the corner areas are provided with radii based on a square or rectangle.
  • the mold suitable for near-net-shape casting consists of wide side walls and narrow side walls in the pouring area.
  • the immersion pouring pipe that dips into the melt during casting is designed with a continuously widened cross-section, at the lower end of which there are two lateral outlet openings with a base piece separating them from each other.
  • Such an immersion pouring pipe is mainly suitable for casting steel strips in the slab casting area, but not for smaller formats such as blooms, billets, round formats or similar. Due to their cross-section, such immersion pipes are complex to manufacture in order to ensure sufficient service life.
  • the invention is based on the object of further developing a continuous casting plant of the type mentioned at the beginning in such a way that an increase in the melt throughput can be made possible with simple means and the required sufficient degree of solidification in the mold can be ensured without affecting the formation and quality of the strand.
  • the pouring tube should be designed in such a way that it is optimally shaped in terms of flow technology and its service life is not limited.
  • the pouring tube is designed with at least one cross-sectional widening and an extended end region in the pouring direction, wherein this end region is immersed in the melt in the mold to below the pouring level during continuous pouring.
  • the invention also provides that the ratio of the exit dimension to the inlet dimension of the flow opening of the pouring tube is preferably between 1.25 and 2.0. With this ratio between the exit dimension and the inlet dimension, the flow rate of the melt, which is increased by the higher throughput, is reduced to values that exist in conventional casting and correspond to lower casting speeds. By reducing the flow rate and thus the kinetic energy when the melt exits the pouring tube, it is avoided that the hot pouring jet can penetrate into the mold far below the pouring level and below the outlet from the pouring tube and cause the strand shell that is being formed to melt again.
  • the invention also provides that the ratio of the external dimension of the pouring tube to the smallest internal dimension of the mold is preferably between 0.5 and 0.8. This ensures that there is a sufficient minimum distance between the outer casing of the pouring tube and the mold, which prevents the the strand shell forming on the mold wall comes into contact with the pouring tube and a breakthrough could occur. In addition, there is a risk that if there is contact between them, the inside of the strand shell and/or the pouring tube could be damaged due to the oscillation of the mold.
  • the pouring tube has a cylindrical design of its flow opening, which is provided with at least one step forming the cross-sectional expansion. This is advantageously formed either vertically or conically in the flow opening. During casting, it is immersed together with the cross-sectional expansion of the pouring tube to below the casting level in the mold.
  • the pouring tube is provided with two or more cross-sectional expansions that follow one another in the pouring direction and can be immersed into the mold one after the other during the pouring operation. This makes it possible to divide the average flow rate into two or more stages as required during the pouring operation, which can result in a more constant melt flow in the pouring tube with less turbulence.
  • the pouring tube In the interests of trouble-free casting, it is advisable to design the pouring tube essentially with a cylindrical shape or one with an almost rectangular cross-section with at least one step that forms the cross-sectional expansion, with the outer wall of the pouring tube running almost parallel to the inner wall of the mold at least in the expanded end area. As mentioned, this can also prevent the strand shell that forms all around the inside of the mold wall from coming into contact with the pouring tube during casting.
  • the invention also relates to a pouring pipe which is particularly suitable for the continuous casting plant and which is easy to manufacture due to its geometry and its properties and whose manufacture as a wearing part is economical.
  • the pouring tube according to the invention is characterized in that it is designed with a cylindrical or box-shaped outer shape with at least one step forming the cross-sectional expansion, wherein the outer wall of the pouring tube is designed at least in the expanded end region such that it runs approximately parallel to the inner wall of the mold during casting operation.
  • Fig.1 shows schematically a mold 2 and a pouring pipe 1 extending into it of a continuous casting plant (not shown in detail) which is used to manufacture metallurgical long products such as billets and similar products.
  • a continuous casting plant has a metallurgical vessel (not shown) with at least one pouring spout and a pouring pipe 1 connected to it, which is immersed in the melt bath in the mold 2 as an immersion pipe during continuous casting as shown.
  • the vessel can also be equipped with several pouring spouts, each with a pouring pipe and a mold for multi-strand casting.
  • Such a continuous casting plant is primarily suitable for the near-net-shape casting of billets with smaller formats between 50 x 50 mm and 220 x 220 mm, where relatively fast Casting speeds in the range of 4 to 12 m/min, preferably 5 to 8 m/min.
  • the billets or blooms cast in the continuous casting machine of the continuous casting plant are very advantageously transferred directly, and in particular without dividing the strand into sections, to a rolling train of a rolling mill and rolled by the rolling stands to form these long products. This is why these increased continuous casting speeds are necessary.
  • the invention does not exclude other formats or casting speeds and the conditions can be adapted to the specific requirements of a steelworks as required.
  • the pouring pipe 1 can be embedded directly in the spout of the vessel provided with a refractory lining, such as in a distribution vessel or the like. However, it can also be held removably on the vessel below the spout by a holding or changing device with or without a control element, such as a sliding closure or a plug.
  • the mold 2 which has a mold cavity cross-section in the form of a billet or a similar format, and thus the long products emerging from it, have a rectangular, square, polygonal, round or rectangular cross-sectional profile combined with rounded corners, as required. Only the walls are shown schematically, but not the water cooling system on the outside and other details of the same.
  • the mold can also be designed in its longitudinal direction with a radius approximately the same as the subsequent radius of the curved strand path.
  • the mold 2 and the pouring tube 1 extending coaxially into it are cylindrical.
  • the mold 2 could be rectangular or square in cross section, for example in a four-round format, and the pouring tube 1 could be cylindrical or in cross section also rectangular or square in cross section as a box shape with a flow opening.
  • the pouring tube 1 shown in the pouring position during continuous pouring is designed with at least one cross-sectional widening with this step 3 and an enlarged end region 4 in the pouring direction L, wherein the step 3 and the end region 4 are immersed in the melt in the mold 2 to below the indicated pouring level 6.
  • the pouring pipe 1 is positioned with its narrower, non-expanded external dimension D1 at the height of the pouring level 6, while it is immersed with its expanded external dimension D2.
  • the step 3 which defines the cross-sectional expansion, is aligned obliquely in the inner wall 5 as a cone with an angle ⁇ to the axial direction of the pouring tube 1.
  • This angle ⁇ can be 135°, for example, but can of course also deviate from this as required.
  • This step 3 could also be rounded at the ring-shaped edges in order to achieve a laminar flow.
  • the pouring tube 1 which is made of a single or multi-part refractory material and is a wearing part, its external shape is designed to be almost the same as its internal shape in the interests of cost-effective production.
  • a largely uniform wall thickness 8 which is preferably dimensioned between 15 and 30 mm.
  • Reinforcement of the pouring tube for longer pouring times can be achieved by a thicker wall thickness or by reinforcement using higher-quality materials, such as, for example, conventional zirconium inserts ZrO2 as rings, preferably in the areas exposed to greater wear.
  • the immersion tube can be designed in such a way that the wall thickness in the area of the non-expanded external dimension D1 is thicker than in the expanded external dimension D2 in order to generate a thicker wear layer of the immersion tube in contact with the casting powder and in particular the casting slag in the mold during casting.
  • the wall thickness of the casting tube could also be thicker at its outlet than in the rest of the area.
  • This cross-sectional expansion of the pouring tube 1 according to the invention produces a diffuser effect in the latter, which causes a reduced flow rate to be caused during pouring on the melt flowing into the mold 2 at the outlet 1' of the pouring tube 1, so that a sufficient strand shell is formed in the mold 2 below the pouring tube 1 up to the outlet of the mold without this strand shell being melted.
  • the end region 4 of the pouring tube 1 is preferably approximately 100 to 150 mm long in the pouring direction L. This depends in particular on the total length of the mould 2.
  • This cross-sectional expansion is dimensioned such that the ratio of the inner outlet dimension d2 to the inlet dimension d1 is, for example, approximately 1.35. This ratio can be selected between 1.25 and 2.0, depending on the operating mode of the system. If the flow opening 9 of the pouring pipe 1 is not cylindrical, this ratio can be
  • the ratio of the exit dimension D2 in the end region 4 to the smallest internal dimension Dm of the mold 2 is set at 0.7. Depending on the casting speed, this ratio can preferably be between 0.5 and 0.8. This results in a sufficient distance a between the pouring tube and the strand shell formed on the inside of the mold so that the strand cannot break through and/or the pouring tube can break off, or the oscillation of the mold can cause damage to the inside of the strand shell and/or the pouring tube. However, this distance should be chosen to be as small as possible in order to maximize performance. The proposed ratio also tolerates a certain deviation in the centering of the pouring tube within the mold.
  • This minimum distance is also important from a metallurgical point of view, so that during casting the continuously applied metal on the meniscus Casting powder melts and forms a liquid slag, which is drawn into the casting gap between the strand shell and the mold by the oscillation of the mold, causing a homogeneous heat extraction and lubrication.
  • the casting powder thus receives enough heat from the melt at the bath surface in the meniscus area to melt there, also so that no bridges can form between the pouring tube and the mold wall due to half-melted material, which would prevent a continuous transport of fresh casting powder and a flow of slag into the casting gap.
  • the pouring pipe 10 shown differs from the pouring pipe 1 according to Fig.1 only in that the step 13 is not inclined or conical, but perpendicular to the inner wall 15 of the pouring tube 10 with an angle ⁇ of approximately 90°. Otherwise, the pouring tube 10 is approximately the same as that according to Fig.1 and therefore only the differences are explained.
  • the same reference numerals are used for the same parts.
  • the flow opening 19 of the tubular pouring pipe 10, which has no lateral openings, also opens into a circular outlet 10', by means of which the melt flow runs in the axial direction or pouring direction L.
  • a pouring tube 20 and a mold 22 according to Fig. 3 and Fig. 4 is a distinguishing feature compared to the pouring pipe 1 according to Fig.1 essentially, the pouring pipe 20 is provided with two cross-sectional extensions in the pouring direction L with corresponding steps 23', 23". Otherwise, the pouring pipe 10 is approximately the same as that according to Fig.1 and therefore only the differences The same reference symbols with one or two upward-shifted primes are used for the same parts.
  • the pouring pipe 20 in the pouring position is immersed in the melt only with its lower step 23" and its lower end area 24" with the outlet 20'.
  • the upper step 23' which is spaced apart from the lower one, is located above the mold 22. It serves as the first extension of the flow opening 29 from the inlet dimension d1 to an intermediate dimension d2', where the external dimension D2' is also at the height of the pouring level 6.
  • the pouring pipe 20 In the pouring position during continuous pouring, the pouring pipe 20 is in a position that is immersed deeper into the melt, with both steps 23', 23" preferably immersed in the melt below the pouring level 6.
  • This positioning can be advantageous if the bath surface is to be dimensioned with a larger annular area in order to be able to use more casting powder.
  • Fig.5 shows a cross-section of a pouring tube 1 in a mold 2, for example according to Fig. 1 or Fig. 2 , in which it is almost cylindrical both in the narrower external dimension D1 and in the extended external dimension D2.
  • the mold 2 is formed with a square cross-sectional profile combined with rounded corners, which is known as the so-called four-round format.
  • the inner wall 7 The mold 2 consists of four flat surfaces and rounded surfaces in the corners, which can be circular or elliptical in shape. Only the resulting differences or additions to the above explanations are mentioned below.
  • the ratio of the external dimension D2 in the end region 4 of the pouring tube 1 to the smallest internal dimension Dm of the mold 2 refers to the points at which the respective distances a between the outer shell of the pouring tube 1 in its end region 4 and the inner wall 7 of the mold 2 are the smallest, which are each between 0.5 and 0.8. These distances a are aligned radially to the longitudinal axis of the pouring tube 1, whereby, for geometric reasons, they are slightly larger in the rounded surfaces than in the flat surfaces.
  • the pouring pipes explained above are provided with stepped outer shapes, the profile of which approximately corresponds to that of the inner shape. However, within the scope of the invention it is easily possible to design the pouring pipes on the outside purely cylindrical or rectangular without any steps, although the front end of the pipe must be able to fit into the mold.
  • the casting pipes are also possible within the scope of the invention to manufacture the casting pipes, particularly in the area of the cross-sectional expansion, with materials that differ from the rest, which in particular counteract the wear caused by the slag.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP22209627.3A 2022-11-25 2022-11-25 Installation de coulée continue, en particulier pour la coulée de produits longs métallurgiques, ainsi qu'une buse de coulée Pending EP4374986A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22209627.3A EP4374986A1 (fr) 2022-11-25 2022-11-25 Installation de coulée continue, en particulier pour la coulée de produits longs métallurgiques, ainsi qu'une buse de coulée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22209627.3A EP4374986A1 (fr) 2022-11-25 2022-11-25 Installation de coulée continue, en particulier pour la coulée de produits longs métallurgiques, ainsi qu'une buse de coulée

Publications (1)

Publication Number Publication Date
EP4374986A1 true EP4374986A1 (fr) 2024-05-29

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EP22209627.3A Pending EP4374986A1 (fr) 2022-11-25 2022-11-25 Installation de coulée continue, en particulier pour la coulée de produits longs métallurgiques, ainsi qu'une buse de coulée

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0403808A1 (fr) 1989-06-03 1990-12-27 Sms Schloemann-Siemag Aktiengesellschaft Tube plongeur pour l'introduction d'acier liquide dans une lingotière de coulée continue
EP0700740A1 (fr) * 1994-08-08 1996-03-13 DANIELI & C. OFFICINE MECCANICHE S.p.A. Busette pour la coulée continue
DE19724232A1 (de) * 1997-06-03 1998-12-24 Mannesmann Ag Verfahren und Vorrichtung zum Erzeugen von Brammen
WO2006010231A1 (fr) * 2004-07-29 2006-02-02 Vesuvius Crucible Company Buse d'entree immergee
US20060243760A1 (en) * 2005-04-27 2006-11-02 Mcintosh James L Submerged entry nozzle
EP2025432A1 (fr) 2007-07-27 2009-02-18 Concast Ag Procédé destiné à la production de produits allongés en acier par coulage en continu et laminage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0403808A1 (fr) 1989-06-03 1990-12-27 Sms Schloemann-Siemag Aktiengesellschaft Tube plongeur pour l'introduction d'acier liquide dans une lingotière de coulée continue
EP0700740A1 (fr) * 1994-08-08 1996-03-13 DANIELI & C. OFFICINE MECCANICHE S.p.A. Busette pour la coulée continue
DE19724232A1 (de) * 1997-06-03 1998-12-24 Mannesmann Ag Verfahren und Vorrichtung zum Erzeugen von Brammen
WO2006010231A1 (fr) * 2004-07-29 2006-02-02 Vesuvius Crucible Company Buse d'entree immergee
US20060243760A1 (en) * 2005-04-27 2006-11-02 Mcintosh James L Submerged entry nozzle
EP2025432A1 (fr) 2007-07-27 2009-02-18 Concast Ag Procédé destiné à la production de produits allongés en acier par coulage en continu et laminage

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