EP0110809A1 - Verfahren und Vorrichtung zur Behandlung von Stahl in der Pfanne - Google Patents

Verfahren und Vorrichtung zur Behandlung von Stahl in der Pfanne Download PDF

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Publication number
EP0110809A1
EP0110809A1 EP83630190A EP83630190A EP0110809A1 EP 0110809 A1 EP0110809 A1 EP 0110809A1 EP 83630190 A EP83630190 A EP 83630190A EP 83630190 A EP83630190 A EP 83630190A EP 0110809 A1 EP0110809 A1 EP 0110809A1
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EP
European Patent Office
Prior art keywords
slag
materials
compartment
bath
tube
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
EP83630190A
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English (en)
French (fr)
Other versions
EP0110809B1 (de
Inventor
Paul Metz
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.)
Paul Wurth SA
Original Assignee
Arbed SA
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Filing date
Publication date
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Application filed by Arbed SA filed Critical Arbed SA
Priority to AT83630190T priority Critical patent/ATE34585T1/de
Publication of EP0110809A1 publication Critical patent/EP0110809A1/de
Application granted granted Critical
Publication of EP0110809B1 publication Critical patent/EP0110809B1/de
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
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • 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
    • C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions
    • 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
    • C21C7/064—Dephosphorising; Desulfurising
    • 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
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
    • C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents

Definitions

  • the present invention relates to a method for the metallurgical treatment of ladle steel, as well as to an installation for implementing this method.
  • the object of the invention is to exploit this new knowledge.
  • reactive slag which is prepared by combustion with oxygen of metallic elements, to which non-metallic elements are optionally added, leads to an acceleration and a improvement of desulfurization, deoxidation and purification reactions, while simultaneously allowing a significant and easily adjustable increase in the temperature of the metal bath.
  • the operation according to the invention can be carried out in the steel-making furnace or any other device, but is particularly effective in the steel ladle.
  • the process according to the invention therefore consists in adding to the liquid metal and by means of a lance, combustible materials such as metallic aluminum, calcium carbide, calcium-silicon, calcium-aluminum as well as possibly scorifying materials, such as lime and / or fluorspar, carried by a neutral or reducing carrier gas, to inject oxygen at the same point of impact, while regulating the amounts of additions and oxygen so as to form at the point of impact in the pocket the slags having the desired composition.
  • combustible materials such as metallic aluminum, calcium carbide, calcium-silicon, calcium-aluminum as well as possibly scorifying materials, such as lime and / or fluorspar
  • the process according to the invention simultaneously leads to the formation of a very hot and particularly reactive slag and to a substantial increase in the temperature of the steel contained in the ladle, provided that convection of the heat created through the bath.
  • Another characteristic of the process according to the invention consists in the simultaneous use of means with a view to avoiding immediate contact between the slag which covers the metal, with the slag formed during the process.
  • These means which will be described in more detail below, are essentially a dip tube which allows access to the metal in the pocket, while avoiding the presence in the working area of the slag entrained during the transfer of the metal into the poached.
  • the slag which covers the metal after pouring into a ladle is removed as far as possible.
  • the surface of the bath is covered with a protective layer which is preferably lime. Then a lid which is part of the installation according to the invention is lowered on the edges of the pocket and the treatment process is started, possibly after having protected the part of the surface of the bath which is free from the slag / lime mixture, by starting slag, as described above.
  • the installation according to the invention consists of a metallurgical ladle which is characterized in that it comprises means for delimiting a working area in the bath, the said means cooperating with means for injecting into said zone solid and gaseous materials and means are provided for introducing into the bath an ascending stream of bubbling gas, directed onto said zone.
  • the means delimiting the working area essentially consist of a dip tube, known per se, which is optionally provided with a cap in order to allow penetration through the slag layer and the exposure of an area of the bath.
  • This dip tube can be either a single compartment tube or a tube subdivided into several compartments.
  • the means for injecting solid and gaseous materials are one or more vertical lances discharging from above, while the means intended for supplying the bubbling gas consist of permeable elements housed in the bottom of the bag and / or by a submerged lance.
  • Fig.1 shows a section through an embodiment of the installation, using a single compartment dip tube.
  • Fig.2 shows a section through a two-compartment dip tube.
  • Figs. 3 and 4 show two variants of the installation shown in fig.l.
  • a pocket 1 provided with a layer of refractory not shown; in the bottom of the pocket is housed a permeable element 2 used to inject the inert bubbling gas or reducing agent G.
  • a single element 2 has been shown for reasons of convenience.
  • a cover 4 which covers the pocket to avoid heat loss and to prevent the entry of ambient air and which crimps the dip tube 5; the latter has at its base a cap 5e made of thin sheet metal, intended to pass through the layer of slag which swims over the steel 3 in the pocket to prevent these slag from entering the tube 5.
  • the cap 5e after fitting the cover 4 on the pocket 1, the cap 5e having passed through the slag layer, melts in the liquid metal.
  • the bubbling obtained by a gas injected from below, allows in many cases to avoid the use of the cap 5e by creating a zone free of slag in the region of the tube 5.
  • the tube 5 is provided with a cover 5c which has gas exhausts 5d. This cover crimps a lance 6 used for the introduction of solid and gaseous materials.
  • the tube 5 also includes an interior and exterior protective coating (not shown).
  • an interior and exterior protective coating (not shown).
  • a coating composed of materials giving off either under the action of high temperatures, or by reaction with the metallic bath respectively the slag and / or with combustion oxygen, a gas capable of reducing respectively to eliminate the contact between container and content.
  • any material having the qualities described above can be used which, as a result of their decomposition, does not result in the introduction of undesirable materials into the metal bath. It is obviously advantageous to choose or include materials which partially decompose into compounds having a beneficial effect on the metallurgical treatment in progress.
  • Adequate protective coatings can be obtained by depositing calcium carbonate, magnesium, soda, etc. mixed with binders, which will be sprayed according to known methods on the surface of the metallurgical container or of the device which is to be introduced in liquid metal. These materials, in contact with the heat of the reactions of the metal bath or slag respectively, will release their C0 2 , while causing an endothermic reaction which counteracts the corrosive effect of the high temperatures generated by the reaction.
  • the protective coating may also consist of combustible materials such as wood, wood agglomerates and / or cardboard. It does not depart from the scope of the invention to constitute protective coatings by means of a mixture of combustible materials and carbonates by using, for example, agglomerated wood respectively cartons containing and / or impregnated with preferably basic carbonates.
  • Either a single lance can be used, which must therefore be a multiflux machine capable of delivering through separate channels solid and gaseous materials which may not be compatible and the contact of which before leaving the lance must be avoided. Indeed, one can easily imagine that it is necessary to prevent the metallic aluminum powder and the oxygen from coming into contact in the insufflation lance itself. To avoid the use of a complex lance, it is also possible to provide two lances, directed towards the same point of impact and one of which will be used to inject the combustible materials conveyed by inert gas and the other to provide the oxygen.
  • a single lance 6 multiflux supplied with oxygen by a pipe 11 and combustible materials by a pipe 7. These materials are stored in tanks 8 provided with cellular metering devices 9; line 7 is connected to a source of inert gas G which may be a neutral or reducing gas.
  • a lance 10 intended to supply bubbling gas G and which can replace the permeable element 2 or supplement it in the case where the flow rate of the permeable element or elements 2 turns out to be insufficient to distribute the heat created. by chemical vote through the bath and to effect a valid purification of the bath by an extended contact between the metal and the purifying slag created in situ.
  • the pocket 1 is provided with a tap hole system 20.
  • Fig.2 shows a dip tube 50 whose main feature is that it is subdivided into two compartments 5a and 5b.
  • the compartment 5a delimits the working area into which solids and oxygen are introduced via the lance 6.
  • compartment 5b it communicates with compartment 5a through the opening 30 which is made in the partition between the two compartments.
  • the compartment 5a is provided at its base with a bottom 12 which has a small opening 12a, while the compartment 5b is open downwards. There is also an interior thermal protection coating. 51 and outside 52.
  • the purpose of the embodiment shown in FIG. 2 is to obtain as complete a combustion as possible of the materials injected into compartment 5a, the operation of heating and refining of the metal taking place essentially in compartment 5b, which contains only the heating and refining slag with a very low content of deoxidizing materials.
  • This double tube is used when one wants to manufacture steels with a very low content of deoxidizing materials.
  • the permeable elements 2 respectively the lance 10, supplying the bubbling gas G are located below the compartment 5b, in which the refining operation takes place as well as the heat transmission.
  • the slag formed in 5a overflows into part 5b where there is an intense bubbling between the metal and the hot slag.
  • a dip tube as shown in fig.2, is of rather complex construction and difficult and costly maintenance.
  • the combustible materials and the fluxes are stored in tanks 8, provided at their base with vibrating dosers 9a discharging into a vibrating chute 7a, this operation can also be done in natural fall by a guide 7a delivering through an airlock (not shown) in the chute 6.
  • the chute 6 will preferably be cooled with water; a neutral or reducing gas G will prevent penetration of gas, slag or metal.
  • the tube 5 is provided in its inner part by a protective coating 5f of wood impregnated with magnesia 2 cm thick.
  • oxygen is introduced into the dip tube 5 by means of two lances lla, optionally cooled with water.
  • the lances lla which are connected to the oxygen pipe 11, as well as the chute 6 serving in this case only for the introduction of solid materials, end up facing a bowl 13a floating in the slag layer 14:
  • the bowl has spacers (not shown) to center it. It is provided with a cone, the tip of which is directed downwards, so as to obtain a suitable bath movement, thanks to the gas blown from below.
  • the blown thermogenic element will be aluminum in the form of powder or granules, mixed with calcium carbide, also in powder or granules, in a proportion of 1.6 kg of CaC 2 to 0.74 kg of Al, as well as possibly 3 to 10% of CaF 2 intended to improve the fluidity of the slag.
  • the pocket 1 contains 100 tonnes of steel from a converter where the steel in the converter had a temperature of 1.610 ° C, the metal contained in the pocket received the additions of ferromanganese, aluminum, silicon etc. necessary to obtain its final analysis and was cleaned of most of the slag from the converter.
  • the temperature in the pocket is currently 1.575 ° C.
  • the bag is then covered with a layer of powdered lime which neutralizes the rest of the slag floating on the bag.
  • a bubbling is then carried out by introducing a neutral gas G through the porous plug 2 and / or the bubbling lance 10. In this way an area free of slag and lime is obtained in the middle of the pocket and the dip tube is introduced. 5 provided with refractories on the bottom and on the outside.
  • a 50 kg layer of prefabricated slag is then introduced into tube 5 and the addition of a mixture of calcium carbide and bauxite with a high content of A1 2 0 3 and titrating about 70% of Al 2 O 3 previously calcined in a proportion is started.
  • 1 kg of calcium carbide for 1.25 kg of bauxite so as to obtain a slag containing approximately 50% Ca0 and 50% Al 2 O 3 , without taking impurities into account.
  • Oxygen is introduced in parallel with the lances 11a into the jet of combustible and scoring products.
  • the temperature finally reached should be 1.605 ° C, while the heat losses during the operation are 1.3 ° C per minute.
  • the mixture injected with oxygen allows a temperature increase of 8 ° C per kg of CaC 2 per tonne of steel and an effective temperature increase of 3 ° C per minute will be sought.
  • the temperature of the 100 tonnes of steel in the converter will, as in the previous example, be 1,610 ° C and 1,535 ° C in the scrubbed pocket, including nuancing and recarburization; we will proceed exactly as in the previous example, the slag layer prefabricated being replaced by a mixture of 60 kg of lime and 1 0 kg of fluorspar introduced into the tube 5 and the addition is begun of the calcium carbide grains 2-4 mm, to which 10% will be added to fluorspar. Oxygen is introduced in parallel with the lance 11a into the jet of calcium carbide, taking care not to completely burn the calcium carbide in the slag finally formed, so as to maintain this slag a deoxidizing and desulfurizing effect. The final temperature will be around 1,560 ° C.
  • the increase of the desired 50 ° C (including 30 ° C for effective reheating and 20 ° C to compensate for the thermal losses incurred by the duration of the operation, approximately 1.3 ° C / minute) will require the addition of 7 kg of CaC 2 and 3.64 m 3 / O 2 per tonne of steel and, thanks to the stirring obtained by the neutral gas G, an important purifying effect without traces of Al in the steel and the increase in the desired temperature.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP83630190A 1982-11-17 1983-11-16 Verfahren und Vorrichtung zur Behandlung von Stahl in der Pfanne Expired EP0110809B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83630190T ATE34585T1 (de) 1982-11-17 1983-11-16 Verfahren und vorrichtung zur behandlung von stahl in der pfanne.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU84472 1982-11-17
LU84472A LU84472A1 (fr) 1982-11-17 1982-11-17 Procede et installation pour le traitement de l'acier en poche

Publications (2)

Publication Number Publication Date
EP0110809A1 true EP0110809A1 (de) 1984-06-13
EP0110809B1 EP0110809B1 (de) 1988-05-25

Family

ID=19729981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83630190A Expired EP0110809B1 (de) 1982-11-17 1983-11-16 Verfahren und Vorrichtung zur Behandlung von Stahl in der Pfanne

Country Status (8)

Country Link
US (1) US4518422B1 (de)
EP (1) EP0110809B1 (de)
JP (1) JPS59133314A (de)
AT (1) ATE34585T1 (de)
AU (1) AU554336B2 (de)
CA (1) CA1213147A (de)
DE (1) DE3376752D1 (de)
LU (1) LU84472A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0171350A1 (de) * 1984-07-19 1986-02-12 MANNESMANN Aktiengesellschaft Metallurgisches Gefäss
EP0334915A1 (de) * 1987-08-24 1989-10-04 Bethlehem Steel Corporation Verfahren zur erhitzung geschmolzenen stahls in einer pfanne
EP0352254A2 (de) * 1988-07-22 1990-01-24 Voest-Alpine Stahl Donawitz Gesellschaft M.B.H. Verfahren zum Erwärmen von Stahlschmelzen
WO1992000391A1 (fr) * 1990-06-29 1992-01-09 Cockerill Sambre S.A. Procede de rechauffage d'un bain d'acier liquide et dispositif pour la mise en ×uvre de ce procede
WO1998031841A1 (fr) * 1997-01-15 1998-07-23 Paul Wurth S.A. Procede et installation pour le traitement de l'acier en poche
LU90924B1 (fr) * 2002-05-24 2003-11-25 Wurth Paul Sa Procédé de traitements métallurgiques sur bain métallique

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU86552A1 (de) * 1986-08-11 1988-03-02 Arbed Verfahren und mittel zum gleichzeitigen aufheizen und reinigen von metallbaedern
US5188661A (en) * 1991-11-12 1993-02-23 Cook Donald R Dual port lance and method
GB2285061B (en) * 1993-12-21 1997-01-08 Vacmetal Gmbh A method of processing ferrous materials
GB2351297B (en) * 1999-06-21 2004-01-21 Vacmetal Gmbh Metallurgical treatment apparatus
FR2809336B1 (fr) * 2000-05-26 2002-11-08 Jean Albert Francois Sunnen Procede de reduction selective de dechets industriels et menagers
EP1428894A1 (de) * 2002-12-13 2004-06-16 SMS Mevac GmbH Entgasungsverfahren von Flüssigstahl
JP4345769B2 (ja) * 2006-04-07 2009-10-14 住友金属工業株式会社 極低硫高清浄鋼の溶製方法
CN104588631B (zh) * 2015-01-19 2018-12-11 新疆八一钢铁股份有限公司 应用钢渣余热烘烤新修砌铁水包的方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE898595C (de) * 1950-02-06 1953-12-03 Leo Henry Timmins Verfahren zum Reinigen von geschmolzenem Eisen
US2776206A (en) * 1953-08-01 1957-01-01 Int Nickel Co Method and apparatus for introducing low-boiling substances into molten metal
GB1076456A (en) * 1964-02-28 1967-07-19 Gborg Fischer Ag Method of and apparatus for treating molten metals
LU57878A1 (de) * 1968-02-01 1969-05-21
DE2032845A1 (de) * 1969-07-15 1971-02-04 Allmanna Svenska Elektnska Aktie bolaget, Vasteras (Schweden) Stahlherstellung
DE1959173A1 (de) 1969-11-25 1971-06-09 Eitel Hans Joachim Verfahren zur Herstellung von Stahlschmelzen
FR2204692A1 (en) 1972-10-31 1974-05-24 Arbed Making addns to steel melts - in ladles without slag contamination
GB1436452A (en) * 1973-06-07 1976-05-19 Kobe Steel Ltd Method of and apparatus for agitating a bath of molten metal
US3971655A (en) 1974-08-21 1976-07-27 Nippon Steel Corporation Method for treatment of molten steel in a ladle
DE2558072A1 (de) * 1975-12-22 1977-07-07 Labate Michael D Verfahren und vorrichtung zum einfuehren von entschwefelungs- oder anderen zusaetzen unter dem metallbadspiegel
EP0000466A1 (de) * 1977-07-13 1979-02-07 VOEST-ALPINE Aktiengesellschaft Verfahren zum Einbringen von körnigen Stoffen in eine Metallschmelze und Vorrichtung zur Durchführung des Verfahrens
FR2432552A1 (fr) * 1978-08-03 1980-02-29 Siderurgie Fse Inst Rech Lance a double flux pour l'insufflation en profondeur de produits pulverulents au sein d'une masse en fusion
FR2491364A1 (fr) * 1980-10-03 1982-04-09 Morival Fernand Dispositif permettant l'introduction d'une poudre de traitement dans un bain d'acier en fusion

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AT247888B (de) * 1961-10-16 1966-06-27 Oesterr Alpine Montan Verfahren zur Herstellung hochlegierter Stähle und Anwendung desselben zur Herstellung von ultraweichen Chrom-Nickel-Stählen
GB1148602A (en) * 1966-09-26 1969-04-16 Steel Co Of Wales Ltd Improvements in and relating to the treatment of metals
DE2321644B2 (de) * 1973-04-28 1976-06-10 Verfahren zum entschwefeln von stahlschmelzen
DE2333937C2 (de) * 1973-07-04 1975-07-17 Fried. Krupp Huettenwerke Ag, 4630 Bochum Verfahren zur Herstellung hochchromhaltiger Stähle mit niedrigstem Kohlenstoffgehalt
US4130417A (en) * 1975-07-11 1978-12-19 Gfe Gesellschaft Fur Elektrometallurgie Mit Beschrankter Haftung Process for refining high-carbon ferro-alloys

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE898595C (de) * 1950-02-06 1953-12-03 Leo Henry Timmins Verfahren zum Reinigen von geschmolzenem Eisen
US2776206A (en) * 1953-08-01 1957-01-01 Int Nickel Co Method and apparatus for introducing low-boiling substances into molten metal
GB1076456A (en) * 1964-02-28 1967-07-19 Gborg Fischer Ag Method of and apparatus for treating molten metals
LU57878A1 (de) * 1968-02-01 1969-05-21
DE2032845A1 (de) * 1969-07-15 1971-02-04 Allmanna Svenska Elektnska Aktie bolaget, Vasteras (Schweden) Stahlherstellung
DE1959173A1 (de) 1969-11-25 1971-06-09 Eitel Hans Joachim Verfahren zur Herstellung von Stahlschmelzen
FR2204692A1 (en) 1972-10-31 1974-05-24 Arbed Making addns to steel melts - in ladles without slag contamination
GB1436452A (en) * 1973-06-07 1976-05-19 Kobe Steel Ltd Method of and apparatus for agitating a bath of molten metal
US3971655A (en) 1974-08-21 1976-07-27 Nippon Steel Corporation Method for treatment of molten steel in a ladle
DE2558072A1 (de) * 1975-12-22 1977-07-07 Labate Michael D Verfahren und vorrichtung zum einfuehren von entschwefelungs- oder anderen zusaetzen unter dem metallbadspiegel
EP0000466A1 (de) * 1977-07-13 1979-02-07 VOEST-ALPINE Aktiengesellschaft Verfahren zum Einbringen von körnigen Stoffen in eine Metallschmelze und Vorrichtung zur Durchführung des Verfahrens
FR2432552A1 (fr) * 1978-08-03 1980-02-29 Siderurgie Fse Inst Rech Lance a double flux pour l'insufflation en profondeur de produits pulverulents au sein d'une masse en fusion
FR2491364A1 (fr) * 1980-10-03 1982-04-09 Morival Fernand Dispositif permettant l'introduction d'une poudre de traitement dans un bain d'acier en fusion

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0171350A1 (de) * 1984-07-19 1986-02-12 MANNESMANN Aktiengesellschaft Metallurgisches Gefäss
EP0334915A1 (de) * 1987-08-24 1989-10-04 Bethlehem Steel Corporation Verfahren zur erhitzung geschmolzenen stahls in einer pfanne
EP0334915A4 (de) * 1987-08-24 1990-01-08 Bethlehem Steel Corp Verfahren zur erhitzung geschmolzenen stahls in einer pfanne.
EP0352254A2 (de) * 1988-07-22 1990-01-24 Voest-Alpine Stahl Donawitz Gesellschaft M.B.H. Verfahren zum Erwärmen von Stahlschmelzen
EP0352254A3 (de) * 1988-07-22 1990-04-18 Voest-Alpine Stahl Donawitz Gesellschaft M.B.H. Verfahren zum Erwärmen von Stahlschmelzen
WO1992000391A1 (fr) * 1990-06-29 1992-01-09 Cockerill Sambre S.A. Procede de rechauffage d'un bain d'acier liquide et dispositif pour la mise en ×uvre de ce procede
BE1004483A3 (fr) * 1990-06-29 1992-12-01 Cockerill Sambre Sa Procede de rechauffage d'un bain d'acier liquide.
WO1998031841A1 (fr) * 1997-01-15 1998-07-23 Paul Wurth S.A. Procede et installation pour le traitement de l'acier en poche
AU717378B2 (en) * 1997-01-15 2000-03-23 Sms Mevac Gmbh Method and installation for the treatment of steel in a ladle
US6413469B1 (en) 1997-01-15 2002-07-02 Paul Wurth, S.A. Method and installation for ladle treatment of steel
LU90924B1 (fr) * 2002-05-24 2003-11-25 Wurth Paul Sa Procédé de traitements métallurgiques sur bain métallique
WO2003100102A2 (fr) * 2002-05-24 2003-12-04 Paul Wurth S.A. Procédé de traitements métallurgiques sur bain métallique
WO2003100102A3 (fr) * 2002-05-24 2004-02-26 Wurth Paul Sa Procédé de traitements métallurgiques sur bain métallique
AU2003273150B2 (en) * 2002-05-24 2009-01-08 Paul Wurth S.A. Metallurgical treatment method on a metal bath
KR100926321B1 (ko) * 2002-05-24 2009-11-12 풀 부르스 에스.에이. 금속용탕의 야금처리방법

Also Published As

Publication number Publication date
EP0110809B1 (de) 1988-05-25
AU554336B2 (en) 1986-08-14
ATE34585T1 (de) 1988-06-15
LU84472A1 (fr) 1984-06-13
JPH0361724B2 (de) 1991-09-20
JPS59133314A (ja) 1984-07-31
CA1213147A (fr) 1986-10-28
US4518422B1 (en) 1999-06-08
AU2141683A (en) 1984-05-24
US4518422A (en) 1985-05-21
DE3376752D1 (en) 1988-06-30

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