EP0452294A2 - Verfahren und Vorrichtung zum Stranggiessen eines Metalls - Google Patents

Verfahren und Vorrichtung zum Stranggiessen eines Metalls Download PDF

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Publication number
EP0452294A2
EP0452294A2 EP91870056A EP91870056A EP0452294A2 EP 0452294 A2 EP0452294 A2 EP 0452294A2 EP 91870056 A EP91870056 A EP 91870056A EP 91870056 A EP91870056 A EP 91870056A EP 0452294 A2 EP0452294 A2 EP 0452294A2
Authority
EP
European Patent Office
Prior art keywords
metal
cast product
casting
temperature
cooling
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
EP91870056A
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English (en)
French (fr)
Other versions
EP0452294A3 (de
EP0452294B1 (de
Inventor
Paul Naveau
Stéphan Wilmotte
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
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Publication date
Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP0452294A2 publication Critical patent/EP0452294A2/de
Publication of EP0452294A3 publication Critical patent/EP0452294A3/xx
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Publication of EP0452294B1 publication Critical patent/EP0452294B1/de
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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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/112—Treating the molten metal by accelerated cooling
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling

Definitions

  • the present invention relates to the continuous casting of a metal, such as liquid steel; it relates on the one hand to a process and on the other hand to an installation making it possible to carry out continuous casting with a high speed.
  • Continuous casting is a casting method which is now well known and widely used in the art, and in particular in the steel industry.
  • the description which follows is specially devoted to the continuous casting of steel, but it goes without saying that the present process could also find its application for the casting of other metals or metal alloys.
  • continuous casting consists in casting steel from a container, such as a ladle or a distribution basket, in a bottomless ingot mold whose side walls are energetically cooled. .
  • the steel undergoes a beginning of cooling in this ingot mold, and it is extracted therefrom by the bottom in the form of a continuous ingot which has a solidified skin surrounding a liquid core.
  • the ingot undergoes cooling by spraying water, called secondary cooling, while being mechanically supported to avoid breakthroughs, that is to say flows of liquid steel by tearing the skin. solidified.
  • the secondary cooling has the effect of increasing the thickness of the solidified skin to a value where there is no longer any risk of breakthrough.
  • the length of the ingot between the exit of the ingot mold and the point where the solidification is complete is called metallurgical length.
  • the steel is poured vertically and the ingot then follows, during its solidification, a curved trajectory which brings it to the horizontal.
  • the point of passage from the curved trajectory to the rectilinear horizontal trajectory is generally called the straightening point of the ingot, because its curvature becomes zero there.
  • the steel contained in the casting container has a temperature higher than its liquidus temperature, in order to avoid any risk of freezing due to localized cooling.
  • This temperature difference, called overheating is typically of the order of 25 to 35 ° C.
  • the object of the present invention is to provide a process for the continuous casting of a metal, in particular steel, which does not have the above-mentioned drawback and which therefore makes it possible to obtain cast products free from cracks. , both on the surface and inside the metal.
  • the temperature of the metal in the casting container is lowered to a value situated in the aforementioned temperature range, and the temperature of the metal is maintained at this value during casting .
  • This implementation may require heating of the metal to compensate for heat losses by radiation or convection.
  • Another particular implementation of the process of the invention consists in lowering the temperature of said metal by controlled cooling during casting, that is to say between the casting container and the mold.
  • a hollow jet of metal is formed, for example, which flows in a continuous layer along a cooled wall before entering the ingot mold.
  • the first means for lowering the temperature of the metal can consist of a device limiting the cooling of the metal caused by thermal losses in the pouring vessel, ladle or distributor basket; such a device can for example comprise a heat-insulating cover and / or burners.
  • Another embodiment of said first means consists of a vertical conduit disposed between the casting container and the ingot mold, comprising at its inlet end a metal distribution member which extends transversely to near the interior surface of said drove.
  • This vertical duct is preferably cooled externally, for example by circulation of water, over at least part of its length.
  • the second means which provide intense secondary cooling of the cast product, advantageously comprise a box surrounding at least partially and at a certain distance the cast product, and at least one wall of which faces towards said product is pierced with orifices for passage of the liquid. cooling.
  • Such cooling means make it possible to establish a continuous layer of pressurized coolant on the surface of the cast product and thus not only to cool it quickly but also to support it uniformly.
  • said second means could also be constituted, totally or partially, by any other secondary cooling device capable of ensuring the desired cooling.
  • this device may consist of a conventional set of water sprinklers alternating with rollers for supporting the cast product.
  • Another interesting way of ensuring the desired rapid cooling consists in using an enclosure surrounding the product poured over an appropriate length, the interior wall of this enclosure being pierced with orifices directed towards the product to be cooled.
  • This enclosure is supplied with pressurized water; this escapes through the orifices in the form of jets which strike the surface of the cast product to be cooled and ensure its rapid cooling.
  • said third means for the moderate cooling of the cast product comprise an enclosure situated under the aforementioned second means, which surrounds the cast product by defining at its lower end a slot of calibrated width with the poured product.
  • Means can also be provided for measuring the temperature of the product poured at the outlet of said enclosure and for adjusting the width of said slot as a function of the measured temperature.
  • the continuous casting installation is arranged essentially under a casting container, for example a distribution basket symbolized by its casting nozzle 1.
  • the first device encountered by steel is a distribution member 2, in the form of a dome, disposed in the inlet portion of a vertical duct 3, which is provided with a water cooling circuit 4.5. .
  • This vertical duct 3 is extended downwards by a pouring tube 6.
  • the path of the liquid steel is indicated in dotted lines in Figure 1. This first cooling eliminates part of the steel overheating.
  • the pouring tube 6 is introduced into a casting mold 7, of conventional type, and the lower end of this tube is immersed in the liquid steel 8 present in the ingot mold 7.
  • the steel undergoes cooling and a start of solidification in the ingot mold 7, and it leaves it in the form of a continuous ingot 9 having a solidified skin of a relatively small thickness.
  • the partially solidified ingot 9 then enters an intense cooling device 10; this essentially consists of a box surrounding the ingot 9 and whose wall facing the ingot is pierced with slots 11 inclined in the direction of progression of the ingot 9. These slots provide passage to a pressurized coolant, usually water, which forms a continuous layer between the ingot 9 and said wall and which cools and uniformly supports said ingot 9.
  • a pressurized coolant usually water
  • This water then flows along the ingot 9 and is collected in an enclosure 12 which surrounds the ingot under the box 10.
  • the lower end of this enclosure 12 is throttled so as to form an outlet slot 13 calibrated around the ingot 9. Due to this constriction, the water collected in the enclosure 12 forms a relatively calm bath where the ingot undergoes moderate cooling.
  • a pyrometer 14 measures the surface temperature of the ingot 9 at the outlet of the enclosure 12 and optionally controls the width of the slot 13.
  • the ingot is finally guided along a curved trajectory, in a manner known per se, to the straightening point where it takes a trajectory horizontal. Its temperature T R is also measured at the recovery point, because it is this which conditions certain subsequent operations, in particular the hot charging of the cast products.
  • Figure 3 illustrates the evolution of axial segregation as a function of overheating.
  • Axial segregation is expressed by the ratio (C max / C0) between the maximum carbon content, essentially in the axis, and the average carbon content in the cross section of the cast product.
  • Overheating ( ⁇ T) is expressed in degrees centigrade.
  • the products considered here are square billets of 220 mm side, with a nominal carbon content of 0.8%.
  • the Figure shows a curve (a) representing the variation of the aforementioned ratio in the case of products cast with conventional cooling and a casting speed of 0.85 m / min.
  • the set of points (b) corresponds to products obtained in accordance with the invention, cast with a speed of 1.5 m / min.
  • the C max / C0 ratio is much closer to 1 for these latter products, which translates into a marked reduction in axial segregation thanks to the two-stage low overheating and cooling casting provided by the present invention.
  • the method of the invention makes it possible to obtain products having optimal properties, in particular a very fine solidification structure, practically zero central segregation, a total absence of cracks both internal and surface and a very low porosity.
  • An additional advantage is that these properties are obtained with a substantially increased casting speed compared to conventional practice; the productivity of the installation and certain subsequent operations such as hot charging are thereby favored.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP91870056A 1990-04-11 1991-04-08 Verfahren und Vorrichtung zum Stranggiessen eines Metalls Expired - Lifetime EP0452294B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU87722A LU87722A1 (fr) 1990-04-11 1990-04-11 Procede et installation pour la coulee continue d'un metal
LU87722 1990-04-11

Publications (3)

Publication Number Publication Date
EP0452294A2 true EP0452294A2 (de) 1991-10-16
EP0452294A3 EP0452294A3 (de) 1994-01-19
EP0452294B1 EP0452294B1 (de) 1998-07-01

Family

ID=19731229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91870056A Expired - Lifetime EP0452294B1 (de) 1990-04-11 1991-04-08 Verfahren und Vorrichtung zum Stranggiessen eines Metalls

Country Status (4)

Country Link
EP (1) EP0452294B1 (de)
AT (1) ATE167821T1 (de)
DE (1) DE69129671D1 (de)
LU (1) LU87722A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000054909A1 (en) * 1999-03-17 2000-09-21 Corus Uk Limited Apparatus for removing superheat from liquid metal

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771584A (en) * 1971-01-08 1973-11-13 Roblin Industries Method for continuously casting steel billet strands to minimize the porosity and chemical segregation along the center line of the strand
EP0054867A1 (de) * 1980-12-23 1982-06-30 Neue Hamburger Stahlwerke GmbH Verfahren zum Kühlen von Strängen beim Stranggiessen von Stahl
DE3440235A1 (de) * 1984-11-03 1986-05-22 Mannesmann AG, 4000 Düsseldorf Verfahren und vorrichtung zum bandstranggiessen von metallen, insbesondere von stahl
EP0393005A2 (de) * 1989-04-13 1990-10-17 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren und Vorrichtung zur Kühlung eines stranggegossenen Metallerzeugnisses
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3771584A (en) * 1971-01-08 1973-11-13 Roblin Industries Method for continuously casting steel billet strands to minimize the porosity and chemical segregation along the center line of the strand
EP0054867A1 (de) * 1980-12-23 1982-06-30 Neue Hamburger Stahlwerke GmbH Verfahren zum Kühlen von Strängen beim Stranggiessen von Stahl
DE3440235A1 (de) * 1984-11-03 1986-05-22 Mannesmann AG, 4000 Düsseldorf Verfahren und vorrichtung zum bandstranggiessen von metallen, insbesondere von stahl
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
EP0393005A2 (de) * 1989-04-13 1990-10-17 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren und Vorrichtung zur Kühlung eines stranggegossenen Metallerzeugnisses

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 291 (M-989)22 Juin 1990 & JP-A-02 920 438 (NIPPON KINZOKU KOGYO KK) 3 Avril 1990 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000054909A1 (en) * 1999-03-17 2000-09-21 Corus Uk Limited Apparatus for removing superheat from liquid metal

Also Published As

Publication number Publication date
LU87722A1 (fr) 1990-07-24
ATE167821T1 (de) 1998-07-15
DE69129671D1 (de) 1998-08-06
EP0452294A3 (de) 1994-01-19
EP0452294B1 (de) 1998-07-01

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