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EP1047515A1 - Procede et dispositif pour la coulee continue de metaux - Google Patents

Procede et dispositif pour la coulee continue de metaux

Info

Publication number
EP1047515A1
EP1047515A1 EP98966811A EP98966811A EP1047515A1 EP 1047515 A1 EP1047515 A1 EP 1047515A1 EP 98966811 A EP98966811 A EP 98966811A EP 98966811 A EP98966811 A EP 98966811A EP 1047515 A1 EP1047515 A1 EP 1047515A1
Authority
EP
European Patent Office
Prior art keywords
mold
narrow side
area
continuous casting
narrow
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Withdrawn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
EP98966811A
Other languages
German (de)
English (en)
Inventor
Joachim SCHÖNBECK
Jan Vollrath
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 Siemag AG
Original Assignee
SMS Demag 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 Demag AG filed Critical SMS Demag AG
Publication of EP1047515A1 publication Critical patent/EP1047515A1/fr
Withdrawn legal-status Critical Current

Links

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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/0408—Moulds for casting thin slabs

Definitions

  • the invention relates to a process for the continuous casting of metals, in particular thin slabs of steel, in a stationary mold with two opposite broad side walls which have a funnel-shaped opening in the direction of the mold inlet and in the strand withdrawal direction over at least part of the mold height to the thickness of the strand to be cast converge, and two narrow side strips clamped between the broad sides, and a continuous casting mold to carry out the process.
  • Each narrow side wall has a V-shaped recess into which a plate of a corresponding shape made of boron nitride is inserted, the plate starting from the upper edge of the mold with a bulge-shaped thickening which extends into the casting cross-section and extends up to below the casting level in the Mold is enough.
  • the walls of the narrow side strips facing the mold cavity are flat.
  • a continuous mold for casting strands with a maximum thickness of 80 mm is known, the narrow sides of which run perpendicular to the broad sides run essentially parallel to one another, the narrow sides at least in an upper area starting from the mold entrance toward the interior of the mold have a curved cross-section, the curvature of which decreases continuously towards the mold exit.
  • the narrow sides have one in the upper area of the mold towards the inside of the mold and in the lower area a cross-section arched towards the outside of the mold.
  • the length of the inner wall of the narrow side strips thus changes constantly and has a minimum length in the continuous casting direction when changing its curvature direction.
  • DE 35 01 422 A1 discloses a continuous mold for a continuous casting plant for casting a thin strand, in which the cross section of the inlet end in a second direction perpendicular to the first direction has a smaller dimension than the cross section of the outlet end in this second direction.
  • the side walls of the continuous mold have mutually opposite in the first direction, converging in the direction of passage and in the second
  • the inner walls of the narrow side strips which diverge in the direction of the strand are bulged outwards and are preferably bulged in the form of a part circle.
  • the Schmais sidebars used here are not adjustable clamped in the broad sidebars. Furthermore, the distance of the broad side walls in the area of the narrow side strips remains constant over the entire height of the mold.
  • the invention has set itself the goal of providing a process for the continuous casting of metals, including the suitable continuous casting mold, with which high-speed casting is achieved with simple and constructive means, with special consideration of reliable lubrication.
  • the free surface of the liquid metal in the mold outside the immersion pouring tube with a sufficient amount of lubricant, essentially casting powder, with which the lubricant requirement is covered.
  • lubricant essentially casting powder
  • it is melted due to its contact with the hot liquid metal and the friction between the strand shell and the mold is then used as a lubricant in liquid form.
  • the free surface of the mold liquid steel is too small to apply a lubricant in an amount that meets the current lubrication needs of the slab. This applies particularly to speeds above 4 m / min. and increases with increasing casting speed, for example at speeds of 7 to 8 m / min.
  • the bath surface in particular in the area of the narrow side strips, is enlarged and, at the same time, the shape of the narrow-strand side of the slab is influenced in such a way that trouble-free casting is possible.
  • This enlargement in the area of the narrow sides has the advantage that reliable lubrication is achieved especially in the narrow side area of the mold, which is particularly susceptible to insufficient lubrication.
  • a correspondingly larger amount of lubricant is required per free surface of the liquid metal.
  • continuous casting molds have a length in the direction of the broadside distance, which remains constant according to the respective contour except for the natural shrinkage of the slabs.
  • the broadside distance changes significantly. This is achieved according to the invention by the inner wall of the
  • Narrow side strips are designed in an arc or wave shape.
  • a trough-shaped configuration of the broad side walls is provided at least in the shadow of the immersion spout. in the In the area of the mold outlet, the broad side walls are again guided essentially parallel to one another.
  • the trough is designed in such a way that a chord corresponding to the broadside distance in the area of the narrow side bars is one
  • the size of the chord is selected so that not only is the formation of bridges between the immersion pouring tube and the mold avoided, but that the effective bath surface area is increased.
  • Deformation of the strand shell can be carried out in the area of the trough.
  • a wedge of less heat dissipation is provided for the narrow side strips in the casting area of the mold.
  • the wedge has a trapezoidal shape, the trapezoidal tip has a minimum width of 2 mm. Furthermore, below the trapezoidal tip, special influence is exerted on the heat dissipation of the mold in this area.
  • Figure 1 shows a basic structure of the mold with the shape of
  • FIG. 2 shows a narrow side strip with a wedge-shaped insert
  • FIG. 3 shows a mold with a trough
  • FIG. 4 shows the section AA through the mold in the region of the trough.
  • FIG. 1 shows broad sides 31, between which narrow sides are clamped in an adjustable manner.
  • the maximum slab width is shown, in the right part the narrow side is set to a specifiable measure of the slab width.
  • the broadside distance at the mold inlet is marked with d E , that at the mold outlet with d A.
  • a narrow side bar 21 is shown schematically, which is clamped between two wide sides 31 which are arranged with a wide side distance d from one another.
  • the inside 22 of the narrow side bar 21 has a length I.
  • this length I can have the same length as the broadside distance d (example i)). As in example ii), the length I can be arc-shaped and thus longer than the broadside distance d.
  • section CC is also in section DD according to EE
  • Broadside distance d is chosen to be smaller than length I, in the latter case d corresponding to broadside distance d A at the mold outlet.
  • the length I is wave-shaped. A particularly large difference in length between I and d can be achieved by this line of length I having one or two troughs or peaks.
  • FIG. 2 shows a narrow side bar 21, in which a wedge 26 is inserted in the inner wall 22.
  • This wedge 26 has a trapezoidal shape with a width b at the trapezoid tip of greater than 2 mm.
  • the wedge 26 consists of a refractory material, for example boron nitride.
  • the relatively blunt tip has the advantage that, on the one hand, the service life of the wedge is increased and, on the other hand, channels 52 connected to a cooling device 51 (not shown) can be introduced in the narrow side bar 21 below this tip.
  • Specifiable cooling parameters actively influence the temperature and thus the behavior of the slab shell at this point.
  • a trough-shaped bulge 32 is provided in addition to FIG. 1 in the casting area 16 of the mold in the broad sides 31. In this bulge
  • the wide side distance d has the maximum size d M in the area of the trough-shaped bulge 32, in the area of the narrow side strips 21 it has the size d E at the mold inlet 11 and it decreases over the mold height h to the wide side distance at the mold outlet 14 to d A.
  • FIG. 4 shows a section AA again, in which the trough-shaped bulge 32 is shown in a special embodiment, namely in the left part the outer surface 23 is rectilinearly conical and in the right part curved 24 with an inflection point 25.
  • FIG. 3 also shows a square bath surface with the edge length d E at the mold inlet 11 and a square surface with the edge length d A at the mold outlet 14.
  • the ratio d E / d A is between 1.05 to 2.0

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour la coulée continue de métaux, en particulier de brames minces d'acier, dans une lingotière fixe qui présente deux parois latérales larges en vis-à-vis qui présentent, dans la zone d'entrée de coulée, une ouverture en forme d'entonnoir, et convergent, dans le sens de sortie de la brame, en partant de l'entrée de la lingotière, au moins sur une partie de la hauteur de la lingotière, pour former un espace correspondant à l'épaisseur de la brame à couler. Cette lingotière comporte également deux entretoises qui forment les côtés étroits et sont bloquées entre les côtés longs, ainsi qu'un tube de coulée plongeur par l'intermédiaire duquel le métal liquide est introduit dans la lingotière. Sur la surface libre du métal liquide se trouvant dans la lingotière, à l'extérieur du tube plongeur de coulée, est appliqué un lubrifiant en une quantité satisfaisant au besoin de lubrification actuel de la brame, à des vitesses de coulée supérieures à 4 m/min, les surfaces des côtés étroits de la croûte des brames étant déformées de sorte que leur longueur horizontale ne soit pas modifiée d'une valeur supérieure à cinq fois la grandeur de retrait naturel de la brame.
EP98966811A 1998-01-15 1998-12-22 Procede et dispositif pour la coulee continue de metaux Withdrawn EP1047515A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE1998101822 DE19801822C1 (de) 1998-01-15 1998-01-15 Verfahren und Vorrichtung zum Stranggießen von Metallen
DE19801822 1998-01-15
PCT/DE1998/003798 WO1999036211A1 (fr) 1998-01-15 1998-12-22 Procede et dispositif pour la coulee continue de metaux

Publications (1)

Publication Number Publication Date
EP1047515A1 true EP1047515A1 (fr) 2000-11-02

Family

ID=7855038

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98966811A Withdrawn EP1047515A1 (fr) 1998-01-15 1998-12-22 Procede et dispositif pour la coulee continue de metaux

Country Status (5)

Country Link
EP (1) EP1047515A1 (fr)
AU (1) AU2510499A (fr)
DE (1) DE19801822C1 (fr)
TW (1) TW379149B (fr)
WO (1) WO1999036211A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600116859A1 (it) * 2016-11-18 2018-05-18 Danieli Off Mecc Dispositivo di colata continua per bramme sottili

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT379093B (de) * 1984-02-16 1985-11-11 Voest Alpine Ag Durchlaufkokille fuer eine stranggiessanlage
DE3640525C2 (de) * 1986-11-27 1996-02-15 Schloemann Siemag Ag Kokille zum Stranggießen von Stahlband
US5279354A (en) * 1990-11-30 1994-01-18 Acutus Industries, Inc. Method of continuous casting with changing of slab width
DE4138642A1 (de) * 1991-11-25 1993-05-27 Schloemann Siemag Ag Durchlaufkokille zum giessen von straengen mit einer maximalen dicke von 80 mm
DE4337399C2 (de) * 1993-10-26 1995-08-17 Mannesmann Ag Stranggießkokille für die Erzeugung von dünnen Brammen, Platten oder Blechen aus Stahl
DE4403049C1 (de) * 1994-01-28 1995-09-07 Mannesmann Ag Stranggießanlage und Verfahren zur Erzeugung von Dünnbrammen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9936211A1 *

Also Published As

Publication number Publication date
WO1999036211A1 (fr) 1999-07-22
DE19801822C1 (de) 1999-03-18
AU2510499A (en) 1999-08-02
TW379149B (en) 2000-01-11

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