WO2000034535A1 - Procede de denitruration de bains d'acier en fusion - Google Patents

Procede de denitruration de bains d'acier en fusion Download PDF

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Publication number
WO2000034535A1
WO2000034535A1 PCT/DE1999/003784 DE9903784W WO0034535A1 WO 2000034535 A1 WO2000034535 A1 WO 2000034535A1 DE 9903784 W DE9903784 W DE 9903784W WO 0034535 A1 WO0034535 A1 WO 0034535A1
Authority
WO
WIPO (PCT)
Prior art keywords
molten steel
steel
nitrogen
melt
carried out
Prior art date
Application number
PCT/DE1999/003784
Other languages
German (de)
English (en)
Inventor
Friedhelm Wagener
Heinz Holtermann
Original Assignee
Vai Technometal Gmbh
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 Vai Technometal Gmbh filed Critical Vai Technometal Gmbh
Publication of WO2000034535A1 publication Critical patent/WO2000034535A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • 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
    • 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
    • C21C7/10—Handling in a vacuum

Definitions

  • the invention relates to a method for reducing the nitrogen content in molten steel.
  • the known method has the disadvantage that the pretreatment stage used to reduce the sulfur content is complex; Another disadvantage is that the argon throughput required for sufficient denitrification of the steel melt has to be measured quite considerably.
  • the invention is therefore based on the object of specifying a method for reducing the nitrogen content in steel melts which, with less effort and a simple procedure, leads to a significant reduction in the nitrogen concentration in steel melts.
  • the basic idea of the invention provides that the steel melt is subjected to NH 3 as pretreatment.
  • NH 3 can be introduced into the molten steel under atmospheric or under vacuum conditions.
  • heating of the steel melt can be carried out during the application of NH 3 and / or also during the degassing in vacuo, which can be effected for example by adding aluminum.
  • NH 3 can be introduced either via a lance directed at the surface of the molten steel, retracted into the treatment vessel or via an immersion lance immersed in the molten steel, or via the bottom and / or the walls of the treatment vessel located flushing device.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

L'invention concerne un procédé destiné à réduire la teneur en azote dans des bains d'acier en fusion, caractérisé en ce que le bain d'acier en fusion se trouvant dans un récipient de traitement est soumis à l'action de NH3, puis est dégazé sous vide avec introduction simultanée d'argon comme gaz d'entraînement.
PCT/DE1999/003784 1998-12-04 1999-11-25 Procede de denitruration de bains d'acier en fusion WO2000034535A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998156050 DE19856050C1 (de) 1998-12-04 1998-12-04 Verfahren zur Entstickung von Stahlschmelzen
DE19856050.8 1998-12-04

Publications (1)

Publication Number Publication Date
WO2000034535A1 true WO2000034535A1 (fr) 2000-06-15

Family

ID=7890017

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/003784 WO2000034535A1 (fr) 1998-12-04 1999-11-25 Procede de denitruration de bains d'acier en fusion

Country Status (2)

Country Link
DE (1) DE19856050C1 (fr)
WO (1) WO2000034535A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1832620A1 (fr) * 2006-03-07 2007-09-12 Total Petrochemicals Research Feluy Procédé et système de degazage des poudres polymères
EP4026919A1 (fr) * 2021-01-07 2022-07-13 Primetals Technologies Germany GmbH Procédé et dispositif de production d'acier

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1214436A (fr) * 1957-12-06 1960-04-08 Fischer Ag Georg Procédé et dispositif de traitement d'une masse métallique en fusion
JPS57194206A (en) * 1981-05-26 1982-11-29 Kawasaki Steel Corp Production of molten extra low carbon steel
EP0340893A1 (fr) * 1988-05-02 1989-11-08 William M. Tekatch Procédé pour éliminer l'azote du fer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1214436A (fr) * 1957-12-06 1960-04-08 Fischer Ag Georg Procédé et dispositif de traitement d'une masse métallique en fusion
JPS57194206A (en) * 1981-05-26 1982-11-29 Kawasaki Steel Corp Production of molten extra low carbon steel
EP0340893A1 (fr) * 1988-05-02 1989-11-08 William M. Tekatch Procédé pour éliminer l'azote du fer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 043 (C - 152) 19 February 1983 (1983-02-19) *

Also Published As

Publication number Publication date
DE19856050C1 (de) 2000-04-20

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