EP0140001A1 - Procédé et dispositif pour la fabrication d'acier ayant un degré de pureté élevé et une basse teneur en gaz - Google Patents

Procédé et dispositif pour la fabrication d'acier ayant un degré de pureté élevé et une basse teneur en gaz Download PDF

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Publication number
EP0140001A1
EP0140001A1 EP84110166A EP84110166A EP0140001A1 EP 0140001 A1 EP0140001 A1 EP 0140001A1 EP 84110166 A EP84110166 A EP 84110166A EP 84110166 A EP84110166 A EP 84110166A EP 0140001 A1 EP0140001 A1 EP 0140001A1
Authority
EP
European Patent Office
Prior art keywords
converter
inert gas
steel
pan
oxygen
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
EP84110166A
Other languages
German (de)
English (en)
Other versions
EP0140001B1 (fr
Inventor
Ulrich Dipl.-Ing. Glasmeyer
Horst Dipl.-Ing. Willaschek
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.)
Glasmeyer Ulrich Dipl-Ing
MAN GHH Immobilien GmbH
Original Assignee
MAN Gutehoffnungshutte GmbH
MAN Maschinenfabrik Augsburg Nuernberg 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25813671&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0140001(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by MAN Gutehoffnungshutte GmbH, MAN Maschinenfabrik Augsburg Nuernberg AG filed Critical MAN Gutehoffnungshutte GmbH
Priority to AT84110166T priority Critical patent/ATE33679T1/de
Publication of EP0140001A1 publication Critical patent/EP0140001A1/fr
Application granted granted Critical
Publication of EP0140001B1 publication Critical patent/EP0140001B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/068—Decarburising
    • C21C7/0685—Decarburising of stainless steel
    • 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/005—Manufacture of stainless steel
    • 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
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/072—Treatment with gases

Definitions

  • the invention relates to a method and the device for the production of steels with a high degree of purity and low gas contents for special requirements, in which the liquid steel is refined with an inert gas in a pan and the treatment steps refining and deoxidizing are carried out in a converter.
  • the best known is the melting in the arc furnace or the melting in the arc furnace with subsequent freshening in a converter using mixed gases or under vacuum.
  • the device for carrying out the method according to the invention should furthermore be of relatively simple construction and be able to be operated at low energy costs, it being possible to dispense with the use of vacuum and high operator expenditure.
  • the converter is refined in one or more phases by means of an inert gas / air / oxygen mixture, with the after a rapid deoxidation phase known per se and, after the smear, a fine rinsing phase with inert gas in the pan.
  • a collecting slag can advantageously be applied to the melt. This is followed by the fine rinsing phase, which in particular prevents the formation of troublesome coarse inclusions.
  • argon in particular can be used as the inert gas.
  • Can also advantageous during the Desoxydationsphase converter in a reduction in the Konverteröff - opening area and / or, during tapping from the converter may further advantageously a deoxidant for the avoidance of Stahloxydation abandoned and the converter to be kept oxygen-free atmosphere.
  • the device for carrying out the method described above is advantageously characterized in that a converter for freshening and deoxidizing the steel is present in several phases, which allows successive treatment with an inert gas / air / oxygen mixture and pure inert gas with widely differing gas quantities.
  • the converter advantageously has a device which temporarily allows the converter opening to be reduced.
  • the converter can advantageously have injection openings and a gas quantity control which allow a continuous variation of the different gases to be injected. Controlling the action of the injection openings individually can be advantageous.
  • the subject matter of the invention makes it possible, with little outlay on equipment and without the use of vacuum, during the adjustment of the steel to the desired one metallurgical values, to produce a particularly high-quality steel, and with which stable and reproducible control is possible.
  • the steel is melted in phase I, this being possible either in a cupola furnace, an induction furnace or an arc furnace or in a crucible heated by a lance.
  • phase II the steel is tapped and provided with the desired alloy additives as well as additives that enable the necessary temperature increase in the fresh process according to phases II and III.
  • phase IV After the melt has been tipped over in a pan in accordance with phase IV, a fine rinsing is carried out there and then in phase V either block, mold or continuous casting etc. can take place.
  • the mixing and control elements for the introduction of the required gases in a converter have an appropriate design and that the injection openings in the bottom or near the bottom of the converter are designed in such a way that they are also in phases with low gas throughput stay free of penetrating steel.
  • the device for reducing the converter opening can be designed such that it can remain on the converter when the melt taps.
  • the melt is emptied via the converter edge, the slag being tipped into the pan and forming part of the collecting slag there.
  • the inert gas atmosphere is maintained in the converter and the outflowing steel is curled to avoid a deoxidizer or the use of an inert gas shield.
  • phase V the steel is then poured under pouring beam protection.
  • All slag formers should be filled in advance in the converter and the batch should be transferred without slag. At least 0.5% carbon is freshened out in the converter.
  • the process gas supply must be controllable in the range of 0.5 - 2.0 Nm 3 / t / min with a suitable extraction of the flue gas quantities.
  • a rinsing with at least 4 - 6 Nm'Ar / t should be carried out and the time until tapping after completion of the melt should not exceed 5 - 10 min.
  • tapping pan It is also advantageous to adjust the tapping pan to be basic or neutral. It should be preheated well and equipped with one or more floor sinks.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP84110166A 1983-09-02 1984-08-25 Procédé et dispositif pour la fabrication d'acier ayant un degré de pureté élevé et une basse teneur en gaz Expired EP0140001B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84110166T ATE33679T1 (de) 1983-09-02 1984-08-25 Verfahren zur herstellung von staehlen mit hohem reinheitsgrad und geringen gasgehalten in stahlwerken und stahlgiessereien.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3331710 1983-09-02
DE3331710 1983-09-02
DE3347718A DE3347718C2 (de) 1983-09-02 1983-12-31 Verfahren zur Herstellung von Stählen mit hohem Reinheitsgrad und geringen Gasgehalten in Stahlwerken und Stahlgießereien
DE3347718 1983-12-31

Publications (2)

Publication Number Publication Date
EP0140001A1 true EP0140001A1 (fr) 1985-05-08
EP0140001B1 EP0140001B1 (fr) 1988-04-20

Family

ID=25813671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84110166A Expired EP0140001B1 (fr) 1983-09-02 1984-08-25 Procédé et dispositif pour la fabrication d'acier ayant un degré de pureté élevé et une basse teneur en gaz

Country Status (4)

Country Link
US (1) US4544405A (fr)
EP (1) EP0140001B1 (fr)
CA (1) CA1231533A (fr)
DE (2) DE3347718C2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19728102C2 (de) * 1997-07-02 1999-08-05 Schloemann Siemag Ag Verfahren und Vorrichtung zur Herstellung von Stählen mit hohem Cr-Gehalt und/oder Ferrolegierungen
GB2406580B (en) * 2000-06-05 2005-09-07 Sanyo Special Steel Co Ltd High-cleanliness steel and process for producing the same
GB2410252B (en) * 2000-06-05 2005-09-07 Sanyo Special Steel Co Ltd High-cleanliness steel and process for producing the same
WO2001094648A2 (fr) * 2000-06-05 2001-12-13 Sanyo Special Steel Co., Ltd. Acier de grande purete et son procede de production

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754894A (en) * 1972-04-20 1973-08-28 Joslyn Mfg & Supply Co Nitrogen control in argon oxygen refining of molten metal
FR2385467A1 (fr) * 1977-03-31 1978-10-27 Union Carbide Corp Procede de production de pieces moulees finies
LU81190A1 (fr) * 1979-04-26 1980-12-16 Centre Rech Metallurgique Perfectionnements aux procedes de desoxydation et de mise a nuance des aciers
FR2506332A1 (fr) * 1981-05-20 1982-11-26 Usinor Dispositif d'alimentation et de distribution de gaz de brassage pour des unites d'injection situees dans le fond d'un convertisseur de fonte en acier a l'oxygene

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US16082A (en) * 1856-11-11 Improvement in the manufacture of iron and steel
GB1206062A (en) * 1967-10-18 1970-09-23 Nippon Kokan Kk Deoxidation method
US3598383A (en) * 1969-01-14 1971-08-10 William H Moore Method and apparatus for incorporating additives in a melt
LU62545A1 (fr) * 1971-02-04 1972-12-05
IT1036194B (it) * 1974-06-07 1979-10-30 British Steel Corp Procedimento e dispositivo a lancia di ossigeno per la produzione dell acciaio
DE2527156B2 (de) * 1975-06-18 1980-09-04 Thyssen Niederrhein Ag Huetten- Und Walzwerke, 4200 Oberhausen Verfahren zur Vorbehandlung einer Stahlschmelze beim Stranggießen
DE7928208U1 (de) * 1979-10-04 1980-01-03 Thyssen Ag Vorm. August Thyssen Huette, 4100 Duisburg Vorrichtung zur durchfuehrung metallurgischer reaktionen in einer pfanne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754894A (en) * 1972-04-20 1973-08-28 Joslyn Mfg & Supply Co Nitrogen control in argon oxygen refining of molten metal
FR2385467A1 (fr) * 1977-03-31 1978-10-27 Union Carbide Corp Procede de production de pieces moulees finies
LU81190A1 (fr) * 1979-04-26 1980-12-16 Centre Rech Metallurgique Perfectionnements aux procedes de desoxydation et de mise a nuance des aciers
FR2506332A1 (fr) * 1981-05-20 1982-11-26 Usinor Dispositif d'alimentation et de distribution de gaz de brassage pour des unites d'injection situees dans le fond d'un convertisseur de fonte en acier a l'oxygene

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
JOURNAL OF METALS, Band 21, Nr. 2, Februar 1969, Seiten 59-64, New York, US; J.M. SACCOMANO u.a.: "Making stainless steel in the argon-oxygen reactor at Joslyn" *
STAHL UND EISEN, Band 101, Nr. 6, 23. März 1981, Seiten 81-86, Düsseldorf, DE; U. GLASMEYER et al.: "Stahlherstellung auf dem Verfahrensweg Netzfrequenzinduktionsofen/AOD-Konverter/Horizontal-Stranggiessanlage" *

Also Published As

Publication number Publication date
DE3347718C2 (de) 1986-05-28
DE3470565D1 (en) 1988-05-26
EP0140001B1 (fr) 1988-04-20
CA1231533A (fr) 1988-01-19
US4544405A (en) 1985-10-01
DE3347718A1 (de) 1985-03-28

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