EP0514246B1 - Stahlabkohlungsverfahren in einer Vakuumbehandlungskammer und Vakuumbehandlungskammer dafür - Google Patents

Stahlabkohlungsverfahren in einer Vakuumbehandlungskammer und Vakuumbehandlungskammer dafür Download PDF

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Publication number
EP0514246B1
EP0514246B1 EP92401278A EP92401278A EP0514246B1 EP 0514246 B1 EP0514246 B1 EP 0514246B1 EP 92401278 A EP92401278 A EP 92401278A EP 92401278 A EP92401278 A EP 92401278A EP 0514246 B1 EP0514246 B1 EP 0514246B1
Authority
EP
European Patent Office
Prior art keywords
enclosure
steel
treated
metal
vacuum treatment
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
EP92401278A
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English (en)
French (fr)
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EP0514246A1 (de
Inventor
Bernard Bauvois
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0514246A1 publication Critical patent/EP0514246A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • F27D25/008—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag using fluids or gases, e.g. blowers, suction units
    • 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 present invention relates to a method for decarburizing steel in a vacuum treatment enclosure and a vacuum treatment enclosure for carrying out the process.
  • Such an enclosure is used to carry out decarburization treatments or dehydrogenation as well as light treatments consisting in producing a steel in which the ranges of the various additives are reduced to such an extent that it is impossible to obtain it directly from the converter.
  • the carbon contained in the metal bath to be treated reacts with the oxygen supplied according to the reaction: C + 1/2 WHERE ⁇ CO Oxygen is brought to the level of the liquid metal bath to be treated by means of a lance which plunges into the treatment enclosure.
  • the disadvantage of this process lies in the fact that the oxygen is blown vertically with respect to the walls of the treatment enclosure, that is to say that it never comes into direct contact with the vertical walls of the enclosure on which metal deposits are formed due to projections from the metal bath during treatment.
  • the deposits on the walls of the enclosure contain a certain amount of carbon depending on the carbon content of the steel during previous treatments.
  • the metal to be treated comes to lick these deposits during its circulation in the intermediate ring of the enclosure, circulation due to the blowing of a neutral gas in one of the plungers with which the lower part is provided. of said enclosure.
  • Part of the deposit is then remelted, which can lead to recarburization of the metal to be treated in the enclosure.
  • the object of the present invention is to provide a process for the decarburization of steel in a vacuum treatment chamber consisting of an upper bell-shaped part, an intermediate ring and a lower part in which the bath is located. of metal to be treated provided with two plungers, which plunge into a steel pocket containing all the metal to be treated, in which oxygen is blown horizontally above the bath of metal to be treated, at the level of the intermediate ring of said enclosure.
  • the present invention also relates to a vacuum steel treatment enclosure for implementing the above process, in which at least two horizontal nozzles are formed in the intermediate ring of said enclosure above the metal bath to process, as claimed in claim 2.
  • the steel decarburization method according to the invention consists in sending an oxygen flow 1 above the metal bath to be treated 2 which is in a vacuum treatment enclosure 3 consisting of an upper part 4 in the form bell, an intermediate ring 5 and a lower part 6 comprising two plungers 7,8 plunging into a steel pocket 9 containing all the steel to be treated 10.
  • the vacuum is produced by means of a vacuum pump device of a known type, not shown, connected to the conduit 13 with which the upper part 4 of the enclosure is provided.
  • the important feature is that the oxygen is sent to the treatment chamber horizontally, that is to say perpendicular to the axis XX of said enclosure.
  • the oxygen licks the bath 2 of metal to be treated contained in the intermediate ring.
  • This oxygen reacts with the carbon contained in the metal according to the reaction: C + 1/2 WHERE ⁇ CO as well as with the CO released during the decarburization reaction, according to the reaction CO + 1/2 O2 ⁇ CO2.
  • the oxygen thus provided allows the implementation of decarburization treatments and of lowering the temperature of the steel before treatment since the addition of oxygen induces an exothermic effect.
  • the advantage of such a method lies in the fact that part of the oxygen blown into the treatment enclosure comes into contact with the vertical walls of the upper part 4 and of the intermediate ring 5 of the enclosure. thus preventing metal projections from the treatment from adhering against said walls.
  • an iron oxide is formed, which falls into the bottom of the lower part of the enclosure, lined with refractory material of the magnesia-chromium type.
  • the refractory material then combines with the iron oxide from unbundling, which leads to a reduction in the melting point of the refractory material, hence an acceleration of its wear by erosion.
  • the present invention also relates to a vacuum treatment enclosure for implementing the method described above.
  • the enclosure 3 is provided in its intermediate ring 5 with at least two horizontal nozzles 11, 12 allowing the blowing of oxygen.
  • the horizontal nozzles 11, 12 are regularly distributed around the periphery of the enclosure 3 and are formed in the middle of the intermediate ring 5, above the metal bath to be treated 2.
  • the intermediate ring 5 is provided with two nozzles 11, 12 facing each other, diametrically opposite, disposed at mid-height of said intermediate ring 5 of the enclosure 3.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Furnace Details (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Furnace Charging Or Discharging (AREA)

Claims (4)

  1. Verfahren zur Entkohlung von Stahl in einem Behandlungsraum unter Vakuum, der aus einem oberen Teil (4) in Form einer Glocke, einem Zwischenring (5) und einem unteren Teil (6), in welchem sich das zu behandelnden Metallbad (2) befindet, versehen mit zwei Tauchern (7, 8), welche in die das gesamte zu behandelnde Metall (10) enthaltende Stahlpfanne (9) eintauchen, gebildet ist, wobei nach dem Verfahren Sauerstoff in den Behandlungsraum eingeblasen wird, dadurch gekennzeichnet, daß das Einblasen von Sauerstoff horizontal über dem zu behandelnden Metallbad (2) auf Höhe des Zwischenrings (5) des Raumes erfolgt.
  2. Vakuumbehandlungsraum zur Durchführung des Verfahrens nach Anspruch 1, der aus einem oberen Teil (4) in Form einer Glocke, einem Zwischenring (5) und einem unteren Teil (6), in welchem sich das zu behandelnde Metallbad (2) befindet, versehen mit zwei Tauchern (7, 8), welche in die das gesamte zu behandelnde Metall (10) enthaltende Stahlpfanne (9) eintauchen, gebildet ist, dadurch gekennzeichnet, daß wenigstens zwei horizontale Blasdüsen (11, 12) in dem Zwischenring (5) des Raumes (3) über dem zu behandelnden Metallbad (2) vorgesehen sind.
  3. Vakuumbehandlungsraum nach Anspruch 2, dadurch gekennzeichnet, daß die horizontalen Blasdüsen (11, 12) regelmäßig auf den Umfang des Raumes verteilt sind.
  4. Behandlungsraum nach Anspruch 2, dadurch gekennzeichnet, daß die Blasdüsen (11, 12) in der Mitte des Zwischenrings (58) des Raumes (3) vorgesehen sind.
EP92401278A 1991-05-13 1992-05-07 Stahlabkohlungsverfahren in einer Vakuumbehandlungskammer und Vakuumbehandlungskammer dafür Expired - Lifetime EP0514246B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9105753 1991-05-13
FR919105753A FR2676458B1 (fr) 1991-05-13 1991-05-13 Procede de decarburation d'acier dans une enceinte de traitement sous vide et enceinte de traitement sous vide pour la mise en óoeuvre du procede.

Publications (2)

Publication Number Publication Date
EP0514246A1 EP0514246A1 (de) 1992-11-19
EP0514246B1 true EP0514246B1 (de) 1995-08-02

Family

ID=9412712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92401278A Expired - Lifetime EP0514246B1 (de) 1991-05-13 1992-05-07 Stahlabkohlungsverfahren in einer Vakuumbehandlungskammer und Vakuumbehandlungskammer dafür

Country Status (10)

Country Link
US (1) US5332417A (de)
EP (1) EP0514246B1 (de)
KR (1) KR100232912B1 (de)
AT (1) ATE125933T1 (de)
CA (1) CA2087179C (de)
DE (1) DE69203788T2 (de)
ES (1) ES2076705T3 (de)
FR (1) FR2676458B1 (de)
TW (1) TW202482B (de)
WO (1) WO1992020986A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5603749A (en) * 1995-03-07 1997-02-18 Bethlehem Steel Corporation Apparatus and method for vacuum treating molten steel
KR100270113B1 (ko) * 1996-10-08 2000-10-16 이구택 극저탄소강의 용강 제조장치
RU2215047C2 (ru) * 2001-12-25 2003-10-27 Открытое акционерное общество "Новолипецкий металлургический комбинат" Устройство для циркуляционного вакуумирования стали
RU2212454C1 (ru) * 2002-09-25 2003-09-20 Шатохин Игорь Михайлович Способ вакуумной обработки расплава металла и устройство для его осуществления
RU2331673C1 (ru) * 2006-10-26 2008-08-20 Государственное образовательное учреждение высшего профессионального образования Липецкий государственный технический университет (ЛГТУ) Циркуляционный вакууматор с экраном для подавления капель металла
RU2348700C1 (ru) * 2007-05-08 2009-03-10 Государственное образовательное учреждение высшего профессионального образования Московский государственный вечерний металлургический институт Способ обработки жидкой стали в вакуумной камере
RU2430974C1 (ru) * 2010-04-30 2011-10-10 Владимир Викторович Тиняков Способ вакуумирования стали
CN111518992B (zh) * 2020-05-08 2022-02-08 赵元庆 一种罐式单嘴精炼炉及真空精炼方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104057A (en) * 1972-06-10 1978-08-01 Hermann Maas Method for making low carbon high chromium alloyed steels
US4071356A (en) * 1976-11-24 1978-01-31 Nippon Steel Corporation Method for refining a molten steel in vacuum
US4105057A (en) * 1977-09-23 1978-08-08 Amity Leather Products Company Flexible receptacle with credit card holder
FR2542014B1 (fr) * 1983-03-02 1985-06-21 Solmer Dispositif pour le decrassage des becs de convertisseur d'acierie
EP0328851A1 (de) * 1988-02-16 1989-08-23 Acciaierie E Ferriere Lombarde Falck S.P.A. Vorrichtung zum Entkohlen von Stählen zu der Pfanne
JPH01283316A (ja) * 1988-05-11 1989-11-14 Nkk Corp 脱ガス槽の保守方法

Also Published As

Publication number Publication date
US5332417A (en) 1994-07-26
FR2676458B1 (fr) 1994-03-04
ES2076705T3 (es) 1995-11-01
FR2676458A1 (fr) 1992-11-20
EP0514246A1 (de) 1992-11-19
CA2087179C (fr) 2002-07-02
DE69203788T2 (de) 1996-01-11
CA2087179A1 (fr) 1992-11-14
KR100232912B1 (ko) 1999-12-01
TW202482B (de) 1993-03-21
WO1992020986A1 (fr) 1992-11-26
ATE125933T1 (de) 1995-08-15
DE69203788D1 (de) 1995-09-07
KR930701721A (ko) 1993-06-12

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