EP0544114A1 - Procédé et dispositif pour la coulée de lingots métalliques - Google Patents

Procédé et dispositif pour la coulée de lingots métalliques Download PDF

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Publication number
EP0544114A1
EP0544114A1 EP92118392A EP92118392A EP0544114A1 EP 0544114 A1 EP0544114 A1 EP 0544114A1 EP 92118392 A EP92118392 A EP 92118392A EP 92118392 A EP92118392 A EP 92118392A EP 0544114 A1 EP0544114 A1 EP 0544114A1
Authority
EP
European Patent Office
Prior art keywords
heat
mold
melt
casting
heating
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Withdrawn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
EP92118392A
Other languages
German (de)
English (en)
Inventor
Eberhard Dr. Ing. Sowka
Hermann Lax
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.)
Thyssen Stahl AG
Original Assignee
Thyssen Stahl 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 Thyssen Stahl AG filed Critical Thyssen Stahl AG
Publication of EP0544114A1 publication Critical patent/EP0544114A1/fr
Withdrawn legal-status Critical Current

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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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
    • 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
    • B22D11/11—Treating the molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
    • B22D27/06—Heating the top discard of ingots

Definitions

  • the invention relates to a method for the ingot or continuous casting of metals in a mold with heat-dissipating walls and to an apparatus for performing the method.
  • This solidified meniscus shell forms with the heat-dissipating walls a gap that can only be partially filled by molten metal flowing in during further casting, because this flowing metal quickly solidifies due to the cooling on the walls.
  • Another known method provides for the cooling intensity of the cooled walls of the mold on the melt in the region of the molten pool level to be reduced by means of an insert of low thermal conductivity which is adjacent to the melt in the region of the bath level and is arranged in the cooled mold wall.
  • this measure has not been satisfactorily implemented because cracks and / or wear of the insert occur after only a few castings and therefore errors in the Strand surface or even strand breakthroughs can arise (EP 0 030 308 A1).
  • the invention has for its object to provide a method for block or continuous casting of metals and a device suitable for performing this method, with which it is possible to cast blocks or strands that are as free as possible of casting or oscillation marks are on the surface.
  • this object is achieved in that the metal poured into the mold is kept molten by supplying heat in an area of the bath level adjacent to the walls.
  • the method according to the invention does not reduce the cooling intensity of the walls on the melt to form a solidified shell, but instead the formation of a through the targeted supply of heat at the critical point of the area of the bath level adjacent to the cooled mold walls if not prevented, solidified meniscus shell emanating from the cooled walls is considerably reduced. For this reason, there is practically no longer any formation of cast or oscillation marks. Since the cooling effect of the mold wall, for example by the heating or insulating inserts, is not reduced or even canceled in the invention, a desired early growth of the strand shell is not prevented. Comparative investigations with a conventional method for continuous casting and the method according to the invention have shown that with the method according to the invention the depth of the oscillation marks is reduced by more than a power of ten to two powers of ten can be reached.
  • the heat should overheat the melt to 15 o C above the liquidus temperature, so that when the meniscus is flushed over the walls, the gap between the meniscus and the walls is filled as far as possible.
  • heat is supplied to the melt from above.
  • Induction heating can be used for this.
  • a gas burner can also be used. In order to largely avoid oxidation of the bath level by the flame of the gas burner, this may only have a weakly oxidizing character. Oxidation of the molten steel can be safely avoided if there is an indirect supply of heat by heating the bath level using an inert gas as an intermediate carrier for the energy. An indirect supply of heat by heating the pouring slag lying on the molten bath level would also be conceivable. In any case, the heat supply must be designed so that only a predetermined narrow area of the bath surface is heated along the mold walls, but the cooled mold walls are not heated directly.
  • the gas burner is directed obliquely from above onto the melt with a component directed against the mold wall, then the pouring oil or pouring slag also remains in the area near the wall, so that the problems described do not occur.
  • the melt is heated in the area of the bath level by electromagnetic induction fields penetrating into the melt from the side.
  • electromagnetic induction fields penetrating into the melt from the side.
  • a heating device In a device suitable for carrying out the method, effective heating devices are provided in the mold in the area near the wall to the side or above the bath level.
  • the heating devices are preferably induction heating or gas burners directed at the molten pool level.
  • a heating device In continuous casting, a heating device is preferably used, which consists of several induction coils installed in the mold walls, which are suitably at the level of the bath level or the slag layer are arranged.
  • the melt 2 When pouring molten metal into a mold with heat-dissipating walls 1, the melt 2 forms a convexly curved meniscus in the region near the wall due to the surface tension of the molten metal on the casting level 3. Where the melt 2, with its casting bath level 3 rising in the direction 7, touches the heat-dissipating wall 1, the melt solidifies. This solidified area 4 is washed over by molten metal upon further supply. The melt 2 only partially fills the gap between the meniscus shell 4 and the mold wall 1 because the penetration of the melt into the narrow gap is hindered due to the cooling effect of the mold wall 1. Therefore, each time the meniscus shell is washed over by liquid melt, a linear depression 5 of the block surface is formed on the circumference of the block.
  • a heating device in the form of gas burners 6 is arranged above the bath level 3, the jet direction of which is directed at the bath level 3. With one component, the Beam direction can also be directed to the wall 1. Since the bath level 3 rises continuously during block casting, it is necessary to raise the heating device 6 synchronously with the rising of the bath level. So the conditions are kept the same during ingot casting.
  • a solidifying convex meniscus shell 4 is also formed here.
  • the meniscus shell is washed over by metal, which forms the gap between the meniscus shell 4 and the wall 1 of the mold can only partially fill because the flow into the narrow gap under the strong cooling of the wall 1 is hindered.
  • a line-shaped depression 5 is therefore formed on the circumference of the strand with each oscillation cycle of the mold.
  • An inductive heating device 9 is arranged in the mold wall 1 in the area of the bath level 3 so that the melt that solidifies on the bath level 3 grows as little as possible into the interior of the mold and fills the gap as completely as possible when the melt is flushed over.
  • the height of the inductor 9 is around 30 to 100 mm. This fixed installation of the inductor 9 in the mold wall 1 is possible because during continuous casting the bath level is kept at the same level due to the continuous withdrawal of the strand and the continuous supply of molten metal.
  • the inductor is not located in the wall 1 of the mold, but immediately in front of it just above the casting powder 8 covering the bath level 3.
  • the specific heating power to be applied must be several thousand kW / m2. With a heating output of around 4000 to 8000 kW / m2, a continuous casting melt of 0.15 m / min can be achieved at a rate of rise or pouring. reach a penetration depth of 15 mm for steel. The depth of the cast marks that occurred was less than 0.01 mm. It goes without saying that, at the higher casting speeds customary in continuous casting, the required specific heating power must be chosen to be higher because of the short dwell time of the meniscus in the effective range of the heating device 6. For continuous casting you will therefore need specific heating outputs between 4000 and 30000 kW / m2. In a typical example of continuous casting, the casting speed is approximately 1 m / min.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
EP92118392A 1991-11-28 1992-10-28 Procédé et dispositif pour la coulée de lingots métalliques Withdrawn EP0544114A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4139087A DE4139087A1 (de) 1991-11-28 1991-11-28 Verfahren und vorrichtung zum block- oder stranggiessen von metallen
DE4139087 1991-11-28

Publications (1)

Publication Number Publication Date
EP0544114A1 true EP0544114A1 (fr) 1993-06-02

Family

ID=6445745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92118392A Withdrawn EP0544114A1 (fr) 1991-11-28 1992-10-28 Procédé et dispositif pour la coulée de lingots métalliques

Country Status (9)

Country Link
EP (1) EP0544114A1 (fr)
JP (1) JPH05212518A (fr)
KR (1) KR930009680A (fr)
AU (1) AU2960592A (fr)
CA (1) CA2084025A1 (fr)
CZ (1) CZ350792A3 (fr)
DE (1) DE4139087A1 (fr)
FI (1) FI925345A (fr)
PL (1) PL296725A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ302712B6 (cs) * 2010-02-04 2011-09-14 Afe Cronite Cz S.R.O. Technologie výroby bimetalických a vícevrstvých odlitku odlévaných gravitacním nebo odstredivým litím

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5781944A (en) * 1980-09-13 1982-05-22 Kawasaki Steel Corp Continuous casting device
LU83476A1 (fr) * 1981-07-08 1983-04-06 Centre Rech Metallurgique Perfectionnements aux procedes de coulee continue des metaux,et lingotiere pour la mise en oeuvre de ces procedes
JPS5897464A (ja) * 1981-12-02 1983-06-09 Atsumi Ono 共晶複合材の連続鋳造法
JPS61245949A (ja) * 1985-04-22 1986-11-01 Sumitomo Metal Ind Ltd 連続鋳造方法
JPS62127162A (ja) * 1985-11-27 1987-06-09 Daido Steel Co Ltd 鋼塊の製造方法
JPS6356339A (ja) * 1986-08-25 1988-03-10 Nippon Kokan Kk <Nkk> 滴下式鋳造装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU60743A1 (fr) * 1970-04-16 1972-03-02
IT1040998B (it) * 1975-07-23 1979-12-20 Centro Speriment Metallurg Materozza per la produzione di lingotti fusi sotto elettroscoria
EP0030308A1 (fr) * 1979-11-27 1981-06-17 Concast Holding Ag Moule pour la coulée continue de l'acier
SE452122B (sv) * 1980-04-04 1987-11-16 Nippon Steel Corp Forfarande for kontinuerlig gjutning av stalplatiner fria fran ytdefekter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5781944A (en) * 1980-09-13 1982-05-22 Kawasaki Steel Corp Continuous casting device
LU83476A1 (fr) * 1981-07-08 1983-04-06 Centre Rech Metallurgique Perfectionnements aux procedes de coulee continue des metaux,et lingotiere pour la mise en oeuvre de ces procedes
JPS5897464A (ja) * 1981-12-02 1983-06-09 Atsumi Ono 共晶複合材の連続鋳造法
JPS61245949A (ja) * 1985-04-22 1986-11-01 Sumitomo Metal Ind Ltd 連続鋳造方法
JPS62127162A (ja) * 1985-11-27 1987-06-09 Daido Steel Co Ltd 鋼塊の製造方法
JPS6356339A (ja) * 1986-08-25 1988-03-10 Nippon Kokan Kk <Nkk> 滴下式鋳造装置

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 094 (M-574)25. März 1987 & JP-A-61 245 949 ( SUMITOMO METAL IND LTD ) 1. November 1986 *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 347 (M-641)(2794) 13. November 1987 & JP-A-62 127 162 ( DAIDO STEEL CO LTD ) 9. Juni 1987 *
PATENT ABSTRACTS OF JAPAN vol. 12, no. 272 (M-724)(3119) 28. Juli 1988 & JP-A-63 056 339 ( NIPPON KOKAN KK ) 10. März 1988 *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 167 (M-153)31. August 1982 & JP-A-57 081 944 ( KAWASAKI STEEL CORP ) 31. August 1982 *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 197 (M-239)(1342) 27. August 1983 & JP-A-58 097 464 ( ATSUMI OONO ) 9. Juni 1983 *

Also Published As

Publication number Publication date
JPH05212518A (ja) 1993-08-24
CA2084025A1 (fr) 1993-05-29
KR930009680A (ko) 1993-06-21
DE4139087A1 (de) 1993-06-03
PL296725A1 (en) 1993-07-12
FI925345A0 (fi) 1992-11-25
FI925345A (fi) 1993-05-29
AU2960592A (en) 1993-06-03
CZ350792A3 (en) 1993-06-16

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