EP0051221B1 - Procédé pour la coulée d'acier en continu, notamment de brames - Google Patents

Procédé pour la coulée d'acier en continu, notamment de brames Download PDF

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Publication number
EP0051221B1
EP0051221B1 EP81108778A EP81108778A EP0051221B1 EP 0051221 B1 EP0051221 B1 EP 0051221B1 EP 81108778 A EP81108778 A EP 81108778A EP 81108778 A EP81108778 A EP 81108778A EP 0051221 B1 EP0051221 B1 EP 0051221B1
Authority
EP
European Patent Office
Prior art keywords
strand
stirrer
steel
casting
die
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
Application number
EP81108778A
Other languages
German (de)
English (en)
Other versions
EP0051221A1 (fr
Inventor
Jan Lipton
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 Concast AG
Original Assignee
Concast Holding 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=4334697&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0051221(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Concast Holding AG filed Critical Concast Holding AG
Publication of EP0051221A1 publication Critical patent/EP0051221A1/fr
Application granted granted Critical
Publication of EP0051221B1 publication Critical patent/EP0051221B1/fr
Expired 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields

Definitions

  • the invention relates to a process for the continuous casting of steel, in particular slabs, the liquid core being stirred in the region of the mold by the action of electromagnetic forces.
  • the strand is stirred as usual during these events, the strand is locally "stirred", i. H. it is stirred too long on the same section of the strand.
  • an etching or a sulfur impression of a strand cross section shows a very sharp transition between the outer zone, which at the time of stirring, has already solidified and the inner globulitic zone. This sharp transition is visually visible on the rolled product, therefore undesirable and deteriorates the quality. Difficulties may also arise in the case of pouring because the intended solidification of the metal located in the area of the bathroom mirror is disturbed, because the thin shell formed at the end of the strand melts as a result of the flow of hot steel brought in by the strong stirring movement. This increases the risk of breakthrough when the strand is subsequently pulled off.
  • This object is achieved in that the electromagnetic forces are increased or decreased proportionally or stepwise according to the magnitude of the pull-out speed.
  • An advantageous solution for changing the electromagnetic forces causing the bath movement is brought about by controlling the stirrer output.
  • Another solution could e.g. B. exist by changing the stirrer distance from the strand.
  • the stirrer output can be changed by changing the current and / or the voltage in the stirrer.
  • the standing strand is closed within about two minutes, i. H. After removing slag residues, a lid made of solidified steel is produced by spraying water. The slab is then extended while increasing the pull-out speed and proportionally the stirrer output.
  • a particularly simple regulation within the scope of the invention can consist in that when falling below a preselected pull-out speed, e.g. B. 80%, the stirrer is turned off. If the above limit of the extraction speed is subsequently exceeded, the stirrer is switched on again. This so-called one-point control requires little equipment. If steel of different composition is poured from a number of pans in a sequential casting, separating plates are usually placed in the mold between the steel of the different batches in order to avoid a long transition piece. This requires a reduction in the pull-out speed. In this case, too, the stirrer output is changed accordingly, so that there is no disturbance of the necessary work in the area of the bathroom mirror or local over-stirring.
  • a preselected pull-out speed e.g. B. 80%

Landscapes

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

Claims (4)

1. Procédé pour la coulée continue d'acier, en particulier de brames, où le coeur liquide de la barre coulée est agité par l'action de forces électromagnétiques dans la région de la lingotière, caractérisé par l'augmentation ou la diminution des forces électromagnétiques proportionnellement à la vitesse d'extraction ou par paliers selon l'ordre de grandeur de la vitesse d'extraction.
2. Procédé selon la revendication 1, caractérisé en ce que la variation des forces électromagnétiques est produite par le réglage de la puissance de l'agitateur.
3. Procédé selon la revendication 2, caractérisé en ce que la variation de la puissance de l'agitateur est produite par la variation de son courant électrique d'excitation.
4. Procédé selon la revendication 3 en cas d'utilisation d'un agitateur à phases asymétriques, caractérisé en ce que le réglage des deux phases s'effectue avec maintien du rapport des courants d'excitation à une valeur constante.
EP81108778A 1980-10-30 1981-10-23 Procédé pour la coulée d'acier en continu, notamment de brames Expired EP0051221B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH8071/80 1980-10-30
CH8071/80A CH650429A5 (de) 1980-10-30 1980-10-30 Verfahren zum stranggiessen von stahl, insbesondere von brammen.

Publications (2)

Publication Number Publication Date
EP0051221A1 EP0051221A1 (fr) 1982-05-12
EP0051221B1 true EP0051221B1 (fr) 1984-11-28

Family

ID=4334697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81108778A Expired EP0051221B1 (fr) 1980-10-30 1981-10-23 Procédé pour la coulée d'acier en continu, notamment de brames

Country Status (6)

Country Link
US (1) US4478272A (fr)
EP (1) EP0051221B1 (fr)
JP (1) JPS57106457A (fr)
CA (1) CA1237869A (fr)
CH (1) CH650429A5 (fr)
DE (1) DE3167494D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4103963A1 (de) * 1991-02-09 1992-08-13 Kabelmetal Ag Verfahren zum kontinuierlichen stranggiessen von kupferlegierungen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2236584B1 (fr) * 1973-05-21 1976-05-28 Siderurgie Fse Inst Rech
SE410940C (sv) * 1978-04-05 1986-01-27 Asea Ab Forfaringssett for omroring vid strenggjutning
FI63682C (fi) * 1978-07-28 1983-08-10 Concast Ag Foerfarande foer gjutning av en metallstaong

Also Published As

Publication number Publication date
CH650429A5 (de) 1985-07-31
EP0051221A1 (fr) 1982-05-12
US4478272A (en) 1984-10-23
JPS57106457A (en) 1982-07-02
CA1237869A (fr) 1988-06-14
DE3167494D1 (en) 1985-01-10

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