EP0452294B1 - Procédé et installation pour la coulée continue d'un métal - Google Patents

Procédé et installation pour la coulée continue d'un métal Download PDF

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Publication number
EP0452294B1
EP0452294B1 EP91870056A EP91870056A EP0452294B1 EP 0452294 B1 EP0452294 B1 EP 0452294B1 EP 91870056 A EP91870056 A EP 91870056A EP 91870056 A EP91870056 A EP 91870056A EP 0452294 B1 EP0452294 B1 EP 0452294B1
Authority
EP
European Patent Office
Prior art keywords
metal
cast product
temperature
casting
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.)
Expired - Lifetime
Application number
EP91870056A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0452294A3 (enrdf_load_stackoverflow
EP0452294A2 (fr
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
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 Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP0452294A2 publication Critical patent/EP0452294A2/fr
Publication of EP0452294A3 publication Critical patent/EP0452294A3/xx
Application granted granted Critical
Publication of EP0452294B1 publication Critical patent/EP0452294B1/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
    • B22D11/10—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 allowing continuous casting with a speed high.
  • Continuous casting is a well known casting method and widely used in technology, especially in industry steel.
  • 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 metallic alloys.
  • continuous casting consists of pour steel from a container, such as a ladle or distribution basket, in a bottomless ingot mold with side walls are energetically cooled.
  • Steel begins to cool in this mold, and it is extracted from the bottom in the form of a continuous ingot which presents a solidified skin surrounding a liquid core.
  • the ingot undergoes cooling by splashing water, said secondary cooling, while being supported mechanically to avoid breakthroughs, i.e. steel spills liquid by tearing solidified skin.
  • 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 outlet of the 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 transition point from the curved path to the path horizontal straight is usually called the straightening point of the ingot, because its curvature becomes zero there.
  • the steel contained in the pouring vessel has a temperature higher than its temperature of liquidus, to avoid any risk of freezing due to cooling located.
  • This temperature difference is typically on the order of 25 to 35 ° C.
  • the object of the present invention is to provide a method for casting continuous of a metal, in particular steel, which does not have the disadvantage mentioned above and which therefore makes it possible to obtain free cast products cracks, both on the surface and inside the metal.
  • This implementation may require heating of the metal to compensate heat losses by radiation or convection.
  • Another particular implementation of the process of the invention consists in lower the temperature of said metal by controlled cooling during the casting, that is to say between the casting container and the mold.
  • a hollow jet of metal is formed which flows in a layer continues along a cooled wall before entering the ingot mold.
  • the first ways to lower the temperature of the metal may be in a device limiting the cooling of the metal caused by heat losses in the pouring vessel, ladle or basket distributor; such a device can for example include a cover thermal insulation and / or burners.
  • Another embodiment of said first means consists of a vertical duct arranged between the pouring container and the ingot mold, having 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, by 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 include a box surrounding at least partially and at a certain distance the cast product, and of which at least a wall facing said product is pierced with orifices for passage of the cooling liquid.
  • Such cooling means make it possible to establish a continuous layer pressurized coolant on the surface of the poured product and thus not only to cool it quickly but also to support it uniformly.
  • said second means could also be made up, in whole or in part, by any other secondary cooling capable of providing the desired cooling.
  • this device may consist of a conventional set of water sprinklers alternating with rollers to support the cast product.
  • Another interesting way to ensure the desired rapid cooling consists in using an enclosure surrounding the product poured over a length appropriate, the inner wall of this enclosure being pierced with orifices directed to the product to be cooled.
  • This enclosure is supplied with water under pressure; this escapes through the orifices in the form of jets which strike the surface of the cast product to cool and ensure its rapid cooling.
  • said third means for moderate cooling of the cast product comprise an enclosure located under the aforementioned second means, which surrounds the cast product by defining at its lower end a width slot calibrated with the poured product. Means may also be provided for measure the temperature of the product poured out of said enclosure and to adjust the width of said slot as a function of temperature measured.
  • the continuous casting installation shown schematically in the Figure 1, is arranged essentially under a pouring container, by example a distribution basket symbolized by its pouring nozzle 1.
  • the first device encountered by steel is a distribution device 2, domed, arranged in the inlet portion of a vertical duct 3, which is provided with a water cooling circuit 4.5.
  • This conduit vertical 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 overheating steel.
  • the pouring tube 6 is introduced into a casting mold 7, of the type conventional, 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 beginning of solidification in the mold 7, and it leaves this in the form of a continuous ingot 9 having a solidified skin relatively thin.
  • the partially solidified ingot 9 then enters a device for intense cooling 10; this one basically consists of a box surrounding the ingot 9 and whose wall facing the ingot is pierced with slots 11 inclined in the direction of advancement of the ingot 9. These slots allow passage to pressurized coolant, usually water, which forms a continuous layer between ingot 9 and said wall and which cools and uniformly supports said ingot 9.
  • a device for intense cooling 10 this one basically consists of a box surrounding the ingot 9 and whose wall facing the ingot is pierced with slots 11 inclined in the direction of advancement of the ingot 9.
  • This water then flows along the ingot 9 and is collected in a enclosure 12 which surrounds the ingot under the casing 10.
  • the lower end of this enclosure 12 is constricted so as to form an outlet slot 13 calibrated around ingot 9. Due to this constriction, the water collected in enclosure 12 forms a relatively calm bath where the ingot undergoes a moderate cooling.
  • a pyrometer 14 measures the surface temperature of the ingot 9 at the outlet of enclosure 12 and optionally controls an adjustment 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 horizontal trajectory. Its temperature T R is also measured at the straightening 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 / C 0 ) 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 per 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. It is clearly seen that the ratio C max / C 0 is much closer to 1 for these latter products, which translates into a marked reduction in axial segregation by virtue of the method of low overheating casting and two-stage cooling proposed by the present invention.
  • the process of the invention makes it possible to obtain products having optimal properties, in particular a very solidification structure fine, almost zero central segregation, a total absence of both internal and surface cracks and very low porosity.
  • a additional advantage is that these properties are obtained with a casting speed significantly increased compared to conventional practice; the productivity of the installation and certain subsequent operations as the hot oven are 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 Procédé et installation pour la coulée continue d'un métal Expired - Lifetime EP0452294B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=19731229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91870056A Expired - Lifetime EP0452294B1 (fr) 1990-04-11 1991-04-08 Procédé et installation pour la coulée continue d'un métal

Country Status (4)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2347886A (en) * 1999-03-17 2000-09-20 British Steel Plc Apparatus for removing superheat from liquid metal using a distributor

Family Cites Families (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
DE3048711C2 (de) * 1980-12-23 1991-08-01 Hamburger Stahlwerke Gmbh, 2103 Hamburg Verfahren zum Kühlen von Strängen beim Stranggießen von Stahlknüppeln
DE3440235C2 (de) * 1984-11-03 1986-11-06 Mannesmann AG, 4000 Düsseldorf Verfahren und Vorrichtung zum Bandstranggießen von Metallen, insbesondere von Stahl
EP0269180B1 (fr) * 1986-11-26 1992-01-02 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Dispositif de coulée d'un métal en phase pâteuse
BE1003164A6 (fr) * 1989-04-13 1991-12-17 Centre Rech Metallurgique Procede et dispositif de refroidissement d'un produit metallique coule en continu.

Also Published As

Publication number Publication date
DE69129671D1 (de) 1998-08-06
EP0452294A3 (enrdf_load_stackoverflow) 1994-01-19
ATE167821T1 (de) 1998-07-15
LU87722A1 (fr) 1990-07-24
EP0452294A2 (fr) 1991-10-16

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