EP0166868A2 - 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
EP0166868A2
EP0166868A2 EP85103726A EP85103726A EP0166868A2 EP 0166868 A2 EP0166868 A2 EP 0166868A2 EP 85103726 A EP85103726 A EP 85103726A EP 85103726 A EP85103726 A EP 85103726A EP 0166868 A2 EP0166868 A2 EP 0166868A2
Authority
EP
European Patent Office
Prior art keywords
electrodes
steel
melt
carbon
lid
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.)
Granted
Application number
EP85103726A
Other languages
German (de)
English (en)
Other versions
EP0166868A3 (en
EP0166868B1 (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 metals according to the preamble of the main claim and to a method according to the preamble of claim 6.
  • a lid over the pan similar to that of an electric arc furnace.
  • 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. This corresponds to a price of approx. 6 DM / kg electrode Costs of approx. DM 150,000 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 of metal 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.
  • Remnants of continuous casting billets or remnants of continuous casting round 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 metal strands, preferably of continuous casting billets or continuous casting base material, which have a composition corresponding to the analysis of the molten metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
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
DE19843424510 DE3424510A1 (de) 1984-07-04 1984-07-04 Vorrichtung und verfahren zur metallurgischen nachbehandlung von vorgeschmolzenen metallen
DE3424510 1984-07-04

Publications (3)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6751986B2 (en) 2000-12-22 2004-06-22 The Bog Group, Inc. Structured packing

Families Citing this family (5)

* 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
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
DE102020005129B4 (de) 2020-08-21 2024-05-16 Technische Universität Bergakademie Freiberg, Körperschaft des öffentlichen Rechts Kohlenstoffärmere und kohlenstofffreie Elektroden für den Einsatz in der Stahlmetallurgie

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3232551A1 (de) * 1981-12-01 1983-06-09 Iso "Metalurgkomplekt", Sofija Verfahren und vorrichtung zur behandlung und raffinierung von fluessigen metallegierungen mittels gleichstrom-lichtbogenerhitzung
EP0094334A1 (fr) * 1982-05-07 1983-11-16 Paul Metz Dispositif pour le traitement métallurgique de métaux liquides

Family Cites Families (2)

* 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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3232551A1 (de) * 1981-12-01 1983-06-09 Iso "Metalurgkomplekt", Sofija Verfahren und vorrichtung zur behandlung und raffinierung von fluessigen metallegierungen mittels gleichstrom-lichtbogenerhitzung
EP0094334A1 (fr) * 1982-05-07 1983-11-16 Paul Metz Dispositif pour le traitement métallurgique de métaux liquides

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 5, Nr. 57 (M-64)[729], 18. April 1981; & JP - A - 56 111133 (KAWASAKI SEITETSU) 04.02.1981 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6751986B2 (en) 2000-12-22 2004-06-22 The Bog Group, Inc. Structured packing

Also Published As

Publication number Publication date
DE3561690D1 (en) 1988-04-07
US4604135A (en) 1986-08-05
DE3424510A1 (de) 1986-01-09
EP0166868A3 (en) 1986-10-08
JPS6119722A (ja) 1986-01-28
JPH0142322B2 (fr) 1989-09-12
EP0166868B1 (fr) 1988-03-02

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