EP0512658B1 - Installation pour le traitement d'acier liquide et procédé pour son emploi - Google Patents

Installation pour le traitement d'acier liquide et procédé pour son emploi Download PDF

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Publication number
EP0512658B1
EP0512658B1 EP92250092A EP92250092A EP0512658B1 EP 0512658 B1 EP0512658 B1 EP 0512658B1 EP 92250092 A EP92250092 A EP 92250092A EP 92250092 A EP92250092 A EP 92250092A EP 0512658 B1 EP0512658 B1 EP 0512658B1
Authority
EP
European Patent Office
Prior art keywords
vacuum
melt
vessels
water ring
generating
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 - Lifetime
Application number
EP92250092A
Other languages
German (de)
English (en)
Other versions
EP0512658A1 (fr
EP0512658B2 (fr
Inventor
Schönewolf Dr.-Ing. Georg
Jürgen Ing. Dörpinghaus
Horst Dieter Dr.-Ing. Schöler
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.)
Vodafone GmbH
Original Assignee
Mannesmann 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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Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of EP0512658A1 publication Critical patent/EP0512658A1/fr
Application granted granted Critical
Publication of EP0512658B1 publication Critical patent/EP0512658B1/fr
Publication of EP0512658B2 publication Critical patent/EP0512658B2/fr
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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
    • C21C7/10—Handling in a vacuum

Definitions

  • the invention relates to a plant for the secondary metallurgical treatment of liquid steel, which is arranged within a production chain consisting of a melting device, such as an electric furnace or converter, and a casting device, in particular a continuous casting plant.
  • a melting device such as an electric furnace or converter
  • a casting device in particular a continuous casting plant.
  • the size of the individual parts of the plant and their capacity are matched to one another in such a way that a smooth flow of material within the process chain is guaranteed for a certain generation quantity.
  • Figure 2 shows the original treatment sequence at just one vacuum level.
  • the variant 2 shown in Figure 3 provides for the final treatment of the melt in a separate rinsing station.
  • Variant 3 ( Figure 4) contains a second treatment stand.
  • a further reduction in the cycle sequence is limited by the availability of the conventional vacuum pump system, usually consisting of water ring pumps and steam jets.
  • the problem is therefore to find a solution that ensures a high degree of flexibility and adaptation of the VOD treatment time to the cycle times of the upstream and downstream melting and pouring devices with the least possible effort.
  • the invention is based on a known VOD system. This usually consists of a combination of water ring pumps and the actual core of the vacuum system, the steam jets.
  • the method for melt treatment according to the preamble of claim 6 is further developed according to the invention with regard to the aforementioned problem with the characterizing features of claim 6.
  • Fig. 6 the usual line of treatment of a melt in a VOD system, as shown in Fig. 1, is shown only in the first line, with VAK level 1 (container 1), only with the modification that the Treatment section F was moved to a conditioning stand.
  • VAK level 1 container 1
  • oxygen is blown onto the melt in the ladle 2 by the device for supplying oxygen 6 '.
  • Oxygen can also be supplied via a combustible lance.
  • the first melt is now transferred and finished in a conditioner not shown in FIG. 7.
  • the container 1 is now available for receiving a third ladle, while the container 1 'can be subjected to a deep vacuum by appropriate actuation of shut-off devices.
  • water ring pumps are always used as devices for the generation of a medium vacuum and a combination of water ring pumps and steam jets for the generation of the low vacuum, but a steam jet system of corresponding design can also be used for the medium vacuum.
  • the advantages achieved are an increase in production of the system with reduced investment and operating costs, an increased utilization of the vacuum device and an increased possibility of adapting the VOD treatments to the cycle sequence of the melting or casting devices.
  • FIG. 5 shows a timing diagram of the solution according to the invention, including an electric arc furnace or converter and a continuous casting installation, the cycle time of the vacuum installation being 55 minutes.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Furnace Details (AREA)

Claims (6)

1. Installation pour le traitement métallurgique secondaire d'acier liquide à l'intérieur d'une chaîne de fabrication constituée d'un dispositif de fusion et d'un dispositif de coulée, en particulier une installation de coulée continue, comportant deux supports pour, à chaque fois, un récipient (1,1') pouvant être mis sous vide et contenant de l'acier en fusion, récipients qui présentent des dispositifs (6,6') pour l'amenée d'oxygène et des dispositifs (7,7') pour fournir des fondants au bain de fusion et des conduits tubulaires (3) qui relient les récipients à un dispositif comportant des pompes à anneau d'eau et des dispositifs émetteurs de vapeur pour engendrer un vide,
caractérisée par un dispositif, constitué d'un poste de pompes à anneau d'eau (5') pour engendrer un vide moyen et un dispositif (4,5), constitué de pompes à anneau d'eau (4) et de dispositifs émetteurs de vapeur (5), pour engendrer un vide poussé, les récipients (1,1') pouvant être commutés, au choix, uniquement sur l'un ou l'autre dispositif (5' ou 4,5).
2. Installation selon la revendication 1,
caractérisée en ce que les récipients (1,1') sont prévus pour la réception de poches de coulée (2).
3. Installation selon la revendication 1,
caractérisée en ce que les récipients (1,1') sont formés par des poches de coulée (2) comportant des couvercles étanches au vide démontables.
4. Installation selon une des revendications 1 à 3,
caractérisée en ce que les récipients (1,1') présentent des dispositifs (8,8') pour l'introduction de gaz dans le bain de fusion.
5. Installation selon une des revendications 1 à 4,
caractérisée en ce que les récipients (1,1') sont raccordés à un conduit tubulaire de dérivation (3') du conduit (3) qui mène au dispositif (4,5) pour engendrer le vide, et, entre le point de dérivation (3") et les récipients (1,1'), des dispositifs d'arrêt (9,9') sont agencés et un conduit d'aspiration (10) provenant des pompes à anneau d'eau (5') est raccordé, par l'intermédiaire de ses dérivations (11,11') et par l'intermédiaire de dispositifs d'arrêt (12,12'), au conduit (3') dans une zone entre les récipients (1,1') et les dispositifs d'arrêt respectifs (9,9').
6. Procédé pour le traitement métallurgique secondaire d'acier en fusion sous vide, en particulier pour l'utilisation d'une installation selon les revendications 1 à 5, comportant les étapes suivantes :
1. affinage du bain de fusion en amenant simultanément de l'oxygène,
2. revenue du bain de fusion en liaison à l'amenée d'oxygène,
3. addition d'agents réducteurs avec temps de traitement suivant pour dégazer et désulfurer le bain de fusion, et
4. correction d'analyse et alliage,
au moins une étape de procédé étant effectuée avec introduction simultanée d'un autre gaz, en particulier d'un gaz inerte, dans le bain de fusion et deux bains de fusion étant amenés simultanément sous vide,
caractérisé en ce que les bains de fusion sont amenés sous vide de façon décalée dans le temps, de sorte que, à chaque fois, le bain de fusion se trouvant sous un vide moyen et, pendant ce temps, l'autre bain de fusion, qui a été précédemment amené au vide moyen, sont traités dans le même récipient sous un vide poussé, le vide moyen étant compris dans une plage de 1 bar jusqu'à 200 mbars et le vide poussé au-dessous de cette valeur.
EP92250092A 1991-05-02 1992-04-23 Installation pour le traitement d'acier liquide et procédé pour son emploi Expired - Lifetime EP0512658B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4114613A DE4114613A1 (de) 1991-05-02 1991-05-02 Anlage zur behandlung fluessigen stahls und verfahren zum betrieb einer derartigen anlage
DE4114613 1991-05-02

Publications (3)

Publication Number Publication Date
EP0512658A1 EP0512658A1 (fr) 1992-11-11
EP0512658B1 true EP0512658B1 (fr) 1995-03-01
EP0512658B2 EP0512658B2 (fr) 1998-07-01

Family

ID=6430994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92250092A Expired - Lifetime EP0512658B2 (fr) 1991-05-02 1992-04-23 Installation pour le traitement d'acier liquide et procédé pour son emploi

Country Status (6)

Country Link
US (1) US5242484A (fr)
EP (1) EP0512658B2 (fr)
JP (1) JP3387522B2 (fr)
AT (1) ATE119210T1 (fr)
DE (2) DE4114613A1 (fr)
ES (1) ES2068672T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5520718A (en) * 1994-09-02 1996-05-28 Inland Steel Company Steelmaking degassing method
CN103305662A (zh) * 2013-05-31 2013-09-18 中冶南方工程技术有限公司 用于真空冶炼的真空系统
CN110295269B (zh) * 2019-06-21 2021-11-26 敬业钢铁有限公司 一种使用精炼炉抽真空装置的抽真空方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1062432B (de) * 1957-05-11 1959-07-30 Wiegand Appbau G M B H Entgasung von Metallschmelzen mittels Dampfstrahl-Apparaten
US3467167A (en) * 1966-09-19 1969-09-16 Kaiser Ind Corp Process for continuously casting oxidizable metals
DE2043861A1 (en) * 1970-09-04 1972-03-09 Rheinstahl AG Anlagentechnik, 4300 Essen Steel makin g - pre-heated scrap iron in electric furnaces and staged refining

Also Published As

Publication number Publication date
DE4114613C2 (fr) 1993-07-08
JPH05148528A (ja) 1993-06-15
JP3387522B2 (ja) 2003-03-17
US5242484A (en) 1993-09-07
DE59201502D1 (de) 1995-04-06
ES2068672T3 (es) 1995-04-16
EP0512658A1 (fr) 1992-11-11
DE4114613A1 (de) 1992-11-05
EP0512658B2 (fr) 1998-07-01
ATE119210T1 (de) 1995-03-15

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