EP0166868B1 - Dispositif et procédé pour le traitement ultérieur d'acier préfondu - Google Patents

Dispositif et procédé pour le traitement ultérieur d'acier préfondu Download PDF

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Publication number
EP0166868B1
EP0166868B1 EP85103726A EP85103726A EP0166868B1 EP 0166868 B1 EP0166868 B1 EP 0166868B1 EP 85103726 A EP85103726 A EP 85103726A EP 85103726 A EP85103726 A EP 85103726A EP 0166868 B1 EP0166868 B1 EP 0166868B1
Authority
EP
European Patent Office
Prior art keywords
electrodes
steel
melt
carbon
premelted
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
EP85103726A
Other languages
German (de)
English (en)
Other versions
EP0166868A3 (en
EP0166868A2 (fr
Inventor
Karl-Heinz Dipl.-Ing. Heinen
Wolfgang Dr.-Ing. Glitscher
Heinz Dipl.-Ing. Zörcher
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.)
Krupp Hoesch Stahl AG
Original Assignee
Krupp 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 Krupp Stahl AG filed Critical Krupp Stahl AG
Publication of EP0166868A2 publication Critical patent/EP0166868A2/fr
Publication of EP0166868A3 publication Critical patent/EP0166868A3/de
Application granted granted Critical
Publication of EP0166868B1 publication Critical patent/EP0166868B1/fr
Expired 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
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle

Definitions

  • the invention relates to a device for the metallurgical aftertreatment of premelted steel according to the preamble of claim 1 and to a method according to the preamble of claim 6.
  • the aftertreatment pan is provided with a pan heating device, usually in the form of an arc heater.
  • a pan heating device usually in the form of an arc heater.
  • the molten steel can be heated via the resulting electric arc via one or more electrodes (usually operated with alternating current) which are suspended on support arms and guided through the cover in electrode guides.
  • the electric arc heating can take place both under atmospheric pressure - a sealing of the pan against the lid is not necessary - and under vacuum, the pan being sealed in a vacuum-tight manner from the atmosphere and the electrodes being led through the lid via vacuum seals.
  • Round graphite electrodes are used as electrodes according to the prior art, which can be loaded with high currents and generate an easily controllable arc. Depending on the pan size and the desired heating output, they have a diameter of 300 to 500 mm.
  • the electrodes are consumed by oxidation with the atmosphere during operation.
  • the electrode consumption is approx. 0.5 kg / t of treated steel.
  • - DM / kg electrode this corresponds to costs of approx. 150,000, - DM with a monthly post-treatment of approx. 50,000 tons of steel.
  • the present invention therefore proposes to provide a device for metallurgical aftertreatment of the type mentioned at the beginning with electrodes made from steel strands.
  • the electrodes advantageously consist of billets cast in the strand, which have a composition corresponding to the analysis of the molten metal intended for aftertreatment.
  • the casting structure of these continuous casting billets - in particular of steel billets with a dendritic solidification structure in the core - permits high current loads on such a metal electrode with a high current density, but without the electrodes melting quickly.
  • the burn-off of an electrode made of a continuous cast billet of steel quality 42 Cr Mo 4 with a square cross section of 175 x 175 mm at a load of 40,000 amps and 250 volts for a period of 10 minutes is only approx. 0.5 m, corresponding to a melting weight of 120 kg.
  • a total of 360 kg which is added to the weight of the steel melt to be treated as additional metal.
  • the melted material of the continuous cast billet electrode is therefore not lost, but rather increases the output of the post-treated steel melt. Because of the very low electrode burn-up in relation to the total weight of the molten steel, there is generally no need to consider a different steel quality between the electrode and the melt, since the possibilities of analysis deviations are negligible.
  • the electrodes choose a steel composition that corresponds to the analysis of the post-treated metal.
  • Remnants of continuous casting billets or remnants of continuous casting base material are preferably used as metal electrodes. If these remaining pieces are not of sufficient length for clamping as an electrode, they can easily be welded together to form a longer piece before being used as an electrode.
  • the invention is particularly suitable for the production of low-carbon steels or for the production of steel grades with a narrowly defined carbon content.
  • the inventive method according to claim 6 is advantageously carried out with electrodes made of continuously cast steel billets.
  • Fig. 1 a pan aftertreatment system is shown schematically.
  • the pan 1 consists of a cylindrical pan 1, which contains liquid metal 2.
  • the molten metal is stirred over a bottom blowing stone 3.
  • the pan 1 is closed with a lid 4 through which three electrodes 51, 52 and 53 are passed. The electrode tips reach close to the surface of the molten metal and heat the molten metal there via the electric arc.
  • the electrodes consist of steel strands, preferably of continuous casting billets or round casting material, which have a composition corresponding to the analysis of the molten metal.

Claims (6)

1. Dispositif pour le retraitement métallurgique d'acier de première fusion constitué d'une poche cylindrique recevant la masse fondue et fermée par un couvercle, et d'une ou plusieurs électrodes traversant le couvercle pour le chauffage de la masse fondue par des arcs électriques, caractérisé par le fait que les électrodes (51, 52, 53) sont constituées de barres d'acier.
2. Dispositif selon la revendication 1, caractérisé par le fait que les électrodes (51, 52, 53) sont constituées de billettes de coulée continue.
3. Dispositif selon l'une des revendications 1 et 2, caractérisé par le fait qu'on utilise des électrodes qui présentent une composition correspondant à l'analyse de la masse métallique fondue.
4. Dispositif selon l'une des revendications 1 à 3, caractérisé par le fait que les électrodes (51, 52, 53) présentent une section transversale carrée avec une longueur de côté de 120 à 200 mm.
5. Dispositif selon l'une des revendications 1 à 3, caractérisé par le fait que les électrodes (51, 52, 53) présentent une section transversale circulaire avec des diamètres compris entre 120 et 200 mm.
6. Procédé pour la fabrication d'aciers avec des teneurs en carbone inférieures à 0,02 % ou d'aciers avec des tolérances étroites en carbone, l'acier étant fondu dans un agrégat de fusion et ensuite allié, agité et homogénéisé dans un agrégat de retraitement, la masse fondue étant chauffée par des arcs électriques entre la masse fondue et des électrodes, caractérisé par le fait qu'on règle la teneur en carbone prédéterminée dans l'agrégat de fusion et on la maintient dans l'agrégat de retraitement, qu'on utilise pour créer les arcs électriques des électrodes en acier à faible teneur en carbone.
EP85103726A 1984-07-04 1985-03-28 Dispositif et procédé pour le traitement ultérieur d'acier préfondu Expired EP0166868B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3424510 1984-07-04
DE19843424510 DE3424510A1 (de) 1984-07-04 1984-07-04 Vorrichtung und verfahren zur metallurgischen nachbehandlung von vorgeschmolzenen metallen

Publications (3)

Publication Number Publication Date
EP0166868A2 EP0166868A2 (fr) 1986-01-08
EP0166868A3 EP0166868A3 (en) 1986-10-08
EP0166868B1 true EP0166868B1 (fr) 1988-03-02

Family

ID=6239757

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85103726A Expired EP0166868B1 (fr) 1984-07-04 1985-03-28 Dispositif et procédé pour le traitement ultérieur d'acier préfondu

Country Status (4)

Country Link
US (1) US4604135A (fr)
EP (1) EP0166868B1 (fr)
JP (1) JPS6119722A (fr)
DE (2) DE3424510A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3612174A1 (de) * 1986-04-11 1987-10-15 Krupp Stahl Ag Verfahren und vorrichtung zum verlaengern von aus stahl bestehenden heizelektroden einer nachbehandlungsanlage fuer fluessigen stahl
US6751986B2 (en) 2000-12-22 2004-06-22 The Bog Group, Inc. Structured packing
JP7139876B2 (ja) * 2018-10-25 2022-09-21 日本製鉄株式会社 溶鋼の取鍋精錬方法
JP7139877B2 (ja) * 2018-10-26 2022-09-21 日本製鉄株式会社 溶鋼の取鍋精錬方法
JP7139878B2 (ja) * 2018-10-26 2022-09-21 日本製鉄株式会社 溶鋼の取鍋精錬方法
DE102020005129A1 (de) 2020-08-21 2022-02-24 Technische Universität Bergakademie Freiberg, Körperschaft des öffentlichen Rechts Kohlenstoffärmere und kohlenstofffreie Elektroden für den Einsatz in der Stahlmetallurgie

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT295060B (de) * 1969-07-21 1971-12-27 Boehler & Co Ag Geb Vorrichtung zum Elektroschlackenumschmelzen von Metallen, insbesondere von Stählen
US3826646A (en) * 1969-10-13 1974-07-30 G Karlsson Method for treating melts and means for carrying out this treatment
US4090054A (en) * 1976-10-12 1978-05-16 Brown Boveri Corporation Electrical preheating apparatus
JPS5611133A (en) * 1979-07-11 1981-02-04 Kawasaki Steel Corp Arc-type heating apparatus for molten steel contained in ladle
BG35678A1 (en) * 1981-12-01 1984-06-15 Savov Method and device for treating and refining liquid alloys
LU84133A1 (de) * 1982-05-07 1984-03-07 Arbed Verfahren und vorrichtung zum metallurgischen behandeln von fluessigen metallen

Also Published As

Publication number Publication date
DE3424510A1 (de) 1986-01-09
JPH0142322B2 (fr) 1989-09-12
EP0166868A3 (en) 1986-10-08
JPS6119722A (ja) 1986-01-28
US4604135A (en) 1986-08-05
EP0166868A2 (fr) 1986-01-08
DE3561690D1 (en) 1988-04-07

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