EP0393005A2 - Verfahren und Vorrichtung zur Kühlung eines stranggegossenen Metallerzeugnisses - Google Patents

Verfahren und Vorrichtung zur Kühlung eines stranggegossenen Metallerzeugnisses Download PDF

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Publication number
EP0393005A2
EP0393005A2 EP90870050A EP90870050A EP0393005A2 EP 0393005 A2 EP0393005 A2 EP 0393005A2 EP 90870050 A EP90870050 A EP 90870050A EP 90870050 A EP90870050 A EP 90870050A EP 0393005 A2 EP0393005 A2 EP 0393005A2
Authority
EP
European Patent Office
Prior art keywords
cooling
metal product
product
coolant
intense
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Withdrawn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
EP90870050A
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English (en)
French (fr)
Other versions
EP0393005A3 (de
Inventor
Stéphan Wilmotte
Paul Naveau
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 EP0393005A2 publication Critical patent/EP0393005A2/de
Publication of EP0393005A3 publication Critical patent/EP0393005A3/de
Withdrawn legal-status Critical Current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
    • B22D11/12—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 a method for cooling a continuously cast metal product, as well as a device for carrying out this method.
  • continuous casting is a process which consists in casting a molten metal, in particular steel, in a mold cooled laterally and open at its two ends, and in extracting the metal out of this mold into a product having the form a partially solidified continuous ingot.
  • the solidification of this ingot is then continued under the action of surface cooling, called secondary cooling, which is generally carried out by spraying water under pressure.
  • secondary cooling which is generally carried out by spraying water under pressure.
  • One type of cooling device widely used for this purpose also includes means such as rollers to support the partially solidified ingot and thus avoid breakthroughs.
  • the object of the present invention is to propose a method which makes it possible to remedy the drawbacks which have just been mentioned, by means of continuous cooling of the cast product, belonging to the aforementioned type but which does not give rise to the formation of internal microcracks. .
  • a method of cooling a continuously cast metal product, in which said metal product is subjected, after it has left the continuous casting mold, to an intense cooling step by means of a continuous layer of pressurized coolant formed on the surface of said product is characterized in that at least one moderate cooling step is then applied to said metallic product by means of a coolant ensuring an exchange coefficient of heat less than or equal to 50% of the heat exchange coefficient of the intense cooling step.
  • the heat exchange coefficient of the moderate cooling step is between 20% and 40% of that of the intense cooling step.
  • the heat flow between a hot surface and a coolant is equal to the product of the heat exchange coefficient by the temperature difference between said surface and the coolant; the heat exchange coefficient depends on the method of projection of the coolant, in particular water, and especially on the flow speed and the temperature thereof.
  • water used at said temperature between 25 ° C and 60 ° C, and preferably close to 40 ° is used as the coolant in said moderate cooling step.
  • At least part of the coolant which flows from the intense cooling step of said metal product is collected, said coolant thus collected is kept in contact with said metallic product, this coolant is caused to flow along the metallic product and the speed of flow of said coolant is adjusted as well as its duration of contact with the product as a function of the temperature of the surface of the product after the moderate cooling step.
  • the surface temperature of the product is measured, after the moderate cooling step, it is compared with a predetermined value of this temperature and, depending on whether the measured value is greater or less than said predetermined value of this temperature, it is increased or decreasing the flow speed of said coolant along the metal product.
  • the process which has just been described makes it possible to collect the coolant flowing from the intense cooling step, to keep it in contact with the metallic product for a time sufficient to cause it to heat up to a desired temperature, while allowing it to flow with a speed or a flow rate adjustable as a function of the variation in the outlet temperature of the metal product.
  • the invention also relates to a device allowing the implementation of the method which has been described above.
  • This device is characterized in that it comprises an enclosure surrounding the path of the continuously cast product, in that said enclosure has an inlet end and an outlet end each having an opening intended to deliver passage to said metal product, and in that the opening provided in said outlet end has a calibrated section, which can moreover be adjustable.
  • this device is placed downstream of an intense cooling device, and it comprises means for collecting at least part of the cooling liquid flowing from said intense cooling device. Therefore, no additional water supply is necessary.
  • the device may also include means for measuring the temperature, disposed in the vicinity of the aforementioned calibrated outlet opening, in order to measure the surface temperature of the metal product at the outlet of the moderate cooling device.
  • the device illustrated in FIG. 1 comprises a continuous casting ingot mold 1 under which is placed an intense cooling device 2.
  • This device 2 is here of the type which is described in the aforementioned patent BE-A-904,436, but it could without incon comes to be different, as long as it provides cooling of comparable intensity.
  • the device 3 comprises an enclosure 4, which surrounds the path of the cast metal product.
  • the enclosure 4 consists of a body 5 of essentially constant section, the upper and lower ends of which have openings intended to allow passage to the cast product.
  • the upper end of the body 5 is entirely open, while its lower end is provided with a bottom in the form of a pyramid trunk 6 placed on its small base.
  • This small base is open and its lower edge is reinforced by a rigid frame 7 formed by angles.
  • the angles are placed with their wings inclined at 45 ° relative to a horizontal plane and their apex turned towards the cast metal product. These angles allow correct guidance of the dummy's head during the ascent of the latter before the start of a casting operation.
  • the internal dimension L of this frame 7 is determined so that a gap of width e remains between the face of the cast metal product and the edge at the top of the angles constituting the frame 7.
  • the dimensions L and e can be adapted in depending on the shape and dimensions of the cast metal product, as well as the flow rate of the coolant to be ensured.
  • the device also includes pressure rollers 8 and 9, respectively inside and outside the enclosure 4, as well as guide rollers 10 located inside the enclosure 4.
  • the interior pressure rollers 8 make it possible to reduce the speed d flow of water along the poured product and thus contribute to reducing the agitation of this water in the enclosure 4. The water can therefore undergo a certain heating in this enclosure 4 and thus ensure moderate cooling of the product metallic.
  • a pyrometer 11 measures the surface temperature of the cast metal product.
  • the molten metal for example steel, is poured into a continuous casting mold 1 where it undergoes conventional primary cooling. This results in a metal product 12 having a thin solidified skin, which then passes through an intense cooling device in which the thickness of the solidified skin increases greatly.
  • the metal product 12 then enters a moderate cooling device 3, through the open upper end of the body 5. It is guided by the guide rollers 10 so as to be correctly positioned relative to the internal edge of the rigid frame 7 .
  • the enclosure 4 collects, by its open inlet end, at least part of the water flowing from the intense cooling device 2.
  • the outlet section of the enclosure 4, determined by the dimensions L and e, is significantly less than its inlet section and therefore, the enclosure 4 is filled with water up to a predetermined level.
  • the enclosure 4 can also be provided with means, known per se and not shown here, for varying the level of the water according to the needs of the process.
  • the metal product 12 thus passes through a relatively calm body of water, which heats up on contact, ensuring moderate cooling of this metal product. This moderate cooling prevents too rapid heating of the solidified skin under the action of the heat given off by the still liquid core of the product. Therefore, the solidification of the metal can continue within this product without the appearance of internal microcracks at the solidification front.
  • the pyrometer 11 measures the surface temperature of the metal product 12 as it leaves the device 3 and it can control the re moderate cooling, for example the water level in enclosure 4, as a function of the temperature measured.
  • Fig. 2 illustrates an example of application of the method and the device of the present invention.
  • This example relates to the continuous casting of square section billets of 220 mm side in 0.8% C steel.
  • Diagrams (a) and (b) show, along the vertical axis on the left, the evolution of the surface temperature (T S ) of the billets, in the middle of a face, and along the right vertical axis, the change in the thickness (d) of the solidified surface layer, as a function of the distance (D) measured from the meniscus (M) in the mold 1 (see Fig. 1). In both cases, the same solidified thickness of 100 mm was produced.
  • the billets were poured into an installation of known type, comprising an ingot mold 1 and an intense cooling device 2. These two devices are symbolized in FIG. 2 by rectangles 1 and 2 differently hatched. It can be seen that after leaving the ingot mold 1, the surface temperature of the billets decreases very quickly in the device 2, to rise instantly as soon as it exits therefrom and then quickly reaches a maximum from which it decreases slowly.
  • a moderate cooling device 3 in accordance with the invention, has been added following the intense cooling device 2.
  • Diagram (b) clearly shows that the rise in the surface temperature of the billets is greatly slowed down in the cooling device 3 compared to what it was in the first case at the outlet of the device 2. Thereafter, the temperature also rises more slowly to its maximum value , which is the equalization temperature, before slowly decreasing. This slower rise in the temperature of the billets allows a more progressive solidification of the metal and makes it possible to avoid the formation of microcracks at the solidification front. The evolution of the solidified thickness is also more favorable in this case.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
EP19900870050 1989-04-13 1990-04-05 Verfahren und Vorrichtung zur Kühlung eines stranggegossenen Metallerzeugnisses Withdrawn EP0393005A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8900414A BE1003164A6 (fr) 1989-04-13 1989-04-13 Procede et dispositif de refroidissement d'un produit metallique coule en continu.
BE8900414 1989-04-13

Publications (2)

Publication Number Publication Date
EP0393005A2 true EP0393005A2 (de) 1990-10-17
EP0393005A3 EP0393005A3 (de) 1991-06-12

Family

ID=3884121

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900870050 Withdrawn EP0393005A3 (de) 1989-04-13 1990-04-05 Verfahren und Vorrichtung zur Kühlung eines stranggegossenen Metallerzeugnisses

Country Status (3)

Country Link
EP (1) EP0393005A3 (de)
JP (1) JPH02295656A (de)
BE (1) BE1003164A6 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0452294A2 (de) * 1990-04-11 1991-10-16 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren und Vorrichtung zum Stranggiessen eines Metalls
FR2677565A1 (fr) * 1991-06-14 1992-12-18 Vallourec Ind Procede d'augmentation de la production d'une ligne de coulee continue d'acier.
FR3101793A1 (fr) * 2019-10-11 2021-04-16 Safran Aircraft Engines Installation et procédé d’obtention d’un produit à partir d’une composition fondue

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009226470A (ja) * 2008-03-25 2009-10-08 Kobe Steel Ltd アルミニウム鋳塊またはアルミニウム合金鋳塊の製造方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1280293A (fr) * 1961-02-09 1961-12-29 Aluminium Lab Ltd Procédé et dispositif de coulée continue des métaux
CH456859A (de) * 1965-12-17 1968-05-31 Concast Ag Verfahren und Vorrichtung zum Kühlen von heissem Metall, insbesondere von stranggegossenem Material
US3918467A (en) * 1972-01-21 1975-11-11 Siderurgie Fse Inst Rech Apparatus for the cooling of a continuously cast product
EP0054867A1 (de) * 1980-12-23 1982-06-30 Neue Hamburger Stahlwerke GmbH Verfahren zum Kühlen von Strängen beim Stranggiessen von Stahl
JPS58167064A (ja) * 1982-03-26 1983-10-03 Nippon Kokan Kk <Nkk> 鋼の連続鋳造方法
US4658882A (en) * 1981-01-22 1987-04-21 Nippon Steel Corporation Machine for direct rolling of steel casting and producing steel product therefrom

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE904436A (fr) * 1986-03-18 1986-09-18 Centre Rech Metallurgique Dispositif et procede pour le refroidissement d'un produit metallique coule en continu.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1280293A (fr) * 1961-02-09 1961-12-29 Aluminium Lab Ltd Procédé et dispositif de coulée continue des métaux
CH456859A (de) * 1965-12-17 1968-05-31 Concast Ag Verfahren und Vorrichtung zum Kühlen von heissem Metall, insbesondere von stranggegossenem Material
US3918467A (en) * 1972-01-21 1975-11-11 Siderurgie Fse Inst Rech Apparatus for the cooling of a continuously cast product
EP0054867A1 (de) * 1980-12-23 1982-06-30 Neue Hamburger Stahlwerke GmbH Verfahren zum Kühlen von Strängen beim Stranggiessen von Stahl
US4658882A (en) * 1981-01-22 1987-04-21 Nippon Steel Corporation Machine for direct rolling of steel casting and producing steel product therefrom
JPS58167064A (ja) * 1982-03-26 1983-10-03 Nippon Kokan Kk <Nkk> 鋼の連続鋳造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 2 (M-266)[1439], 7 janvier 1984; & JP-A-58 167 064 (NIPPON KOKAN) 03-10-1983 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0452294A2 (de) * 1990-04-11 1991-10-16 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren und Vorrichtung zum Stranggiessen eines Metalls
EP0452294A3 (de) * 1990-04-11 1994-01-19 Centre Rech Metallurgique
FR2677565A1 (fr) * 1991-06-14 1992-12-18 Vallourec Ind Procede d'augmentation de la production d'une ligne de coulee continue d'acier.
FR3101793A1 (fr) * 2019-10-11 2021-04-16 Safran Aircraft Engines Installation et procédé d’obtention d’un produit à partir d’une composition fondue

Also Published As

Publication number Publication date
JPH02295656A (ja) 1990-12-06
BE1003164A6 (fr) 1991-12-17
EP0393005A3 (de) 1991-06-12

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