EP0571353B2 - Procédé pour galvaniser un feuillard et installation pour la mise en oeuvre de ce procédé - Google Patents

Procédé pour galvaniser un feuillard et installation pour la mise en oeuvre de ce procédé Download PDF

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Publication number
EP0571353B2
EP0571353B2 EP93890053A EP93890053A EP0571353B2 EP 0571353 B2 EP0571353 B2 EP 0571353B2 EP 93890053 A EP93890053 A EP 93890053A EP 93890053 A EP93890053 A EP 93890053A EP 0571353 B2 EP0571353 B2 EP 0571353B2
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EP
European Patent Office
Prior art keywords
strip
layer
zinc
iron content
process according
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
EP93890053A
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German (de)
English (en)
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EP0571353A2 (fr
EP0571353B1 (fr
EP0571353A3 (fr
Inventor
Josef Dipl.-Ing. Faderl
Manfred Dipl.-Ing. Maschek
Alois Dipl.-Ing. Stadlbauer
Klaus Dr. Dipl.-Ing. Zeman
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.)
Voestalpine Stahl GmbH
Primetals Technologies Austria GmbH
Voestalpine Stahl Linz GmbH
Original Assignee
Voestalpine Stahl GmbH
Voestalpine Stahl Linz GmbH
Voest Alpine Industrienlagenbau GmbH
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Application filed by Voestalpine Stahl GmbH, Voestalpine Stahl Linz GmbH, Voest Alpine Industrienlagenbau GmbH filed Critical Voestalpine Stahl GmbH
Publication of EP0571353A2 publication Critical patent/EP0571353A2/fr
Publication of EP0571353A3 publication Critical patent/EP0571353A3/fr
Publication of EP0571353B1 publication Critical patent/EP0571353B1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching

Definitions

  • the invention relates to a method for the method for galvanizing a band, in particular a steel band, the band continuously in a continuous process either electrolytically with Zinc or according to the hot-dip galvanizing process in a zinc bath is coated with zinc, then to form a Zn-Fe layer a heat treatment in a continuous furnace and further an online control of the zinc layer while measuring the iron content subjected to the zinc layer by means of X-ray fluorescence is, the galvanizing process depending on the iron content the zinc layer is controlled, and a plant for Execution of the procedure.
  • the post-annealing process causes the pure zinc layer to diffuse through converted into a Zn-Fe layer by iron.
  • Each A product is formed according to the iron content of the Zn-Fe alloy different mechanical properties (e.g. toughness, Hardness), whereby the area of application (abrasion behavior, weldability, Paintability, corrosion resistance, deep drawing ability) is decisively determined.
  • the Fe content can be adjusted accordingly Measuring devices (e.g. by means of X-ray fluorescence, X-ray diffraction or similar processes), i.e. on-line, be measured, e.g. described in EP-A 0 473 154 is, the measurement result is usually about one Average value of the Fe content over the thickness of the Zn-Fe layer represents.
  • the invention has for its object that described above Process to further develop that a galvanized Tape with a defined layer structure can, being directly and immediately in the manufacturing process for Ensuring a uniform quality of the galvanized Band can be intervened and the production of rejects is minimized.
  • inventive Procedure of automatic consideration of intended Enabling changes in process parameters as well as their unintentional changes so that the manufacturing process is continuously optimized and without manual intervention.
  • This object is achieved by a method for Galvanizing a strip, in particular a steel strip, solved, the belt being continuously continuous either electrolytically with zinc or according to the hot-dip galvanizing process is coated with zinc in a zinc bath, then for Formation of a Zn-Fe layer of a heat treatment in one Continuous furnace and an on-line control of the zinc layer subjected to measurement of the iron content of the zinc layer by means of X-ray fluorescence is, the galvanizing process depending on the Iron content of the zinc layer is controlled, a value of Iron content of the Zn-Fe layer is determined as a reference variable, the actual value of the iron content of the Zn-Fe layer with the Reference variable compared and a control deviation over one Controller in a closed loop with the help of a Calculator, taking into account the tape dimension, the Basic material of the tape with regard to its chemical Composition and / or structure, the zinc layer thickness, the Composition of the zinc bath, e.g. its Al content, the Belt speed and possibly other parameters such as the temperature
  • the method according to the invention is based on the knowledge that the diffusion processes of iron into the zinc layer (diffusion rate, Iron content) primarily from temperature and the duration of the heat treatment in the continuous furnace.
  • the temperature control in the continuous furnace influences the structure of the galvannealt layer crucial and therefore also the mechanical properties of the product.
  • the surface of the tape after or during the Heat treatment measured using at least one pyrometer.
  • the procedure is preferably that of the belt passage by measurement using several in the direction of tape travel successively arranged pyrometer that position is determined from which the Zn-Fe layer has reacted, and by regulation the heating power of the continuous furnace this point in Belt running direction in front of a border point, from which the Zn-Fe layer must be fully reacted at the latest.
  • the regulation is done in a closed loop performed by a computer that registers the control deviation and the heating power of the continuous furnace by means of control commands regulates, the computer to increase reproducibility the quality of the tape produced, the tape dimension, the Basic material of the tape with regard to its chemical Composition and / or structure, the zinc layer thickness, the Composition of the zinc bath, e.g. its Al content, the Belt speed and possibly other parameters such as the temperature of the belt at the inlet of the continuous furnace and the Ambient temperature, taken into account.
  • a preferred embodiment is characterized in that the heating power and thus the temperature inside the continuous furnace can be set differently in individual heating zones is.
  • the heating output in the direction of Bandwidth of adjacent heating zones varies adjustable.
  • the Heating output in the line running direction Heating zones can be set differently, which increases the warm-up speed of the tape or the holding time of the tape on a certain temperature in order to achieve optimal tape quality can be varied.
  • Measuring device for measuring the iron content of the zinc layer characterized in that the measuring device with a a controller connected to a process computer, which is connected via a control line with the heating device of the heat treatment device is coupled.
  • the controller is coupled to a process computer.
  • At least one additional one is expedient: as a pyrometer trained radiation measuring device provided on the belt path after or in the heat treatment device, which is also coupled to the controller.
  • FIG. 1 in a schematic representation illustrates a system for galvanizing a strip.
  • the dependency is in the diagram shown in FIG of the iron content from the heating output.
  • Fig. 3 shows a deviation in the iron content in the Zn-Fe layer as a function of the bandwidth
  • FIG. 4 the dependence of the radiation emission on the holding time.
  • a steel strip 1 to be galvanized is by means of a strip guide device, the one Has a plurality of tape guide rollers 2, continuously along a tape path 3 of a not shown Unwind station to a winding station, also not shown.
  • this arrives Steel strip first to a zinc coating device 4, which in the illustrated embodiment as a hot-dip galvanizing device is designed.
  • This has a zinc bath 5 and a stripping device arranged downstream in the strip running direction 6 7 to ensure a constant zinc layer which is of equal thickness over the range.
  • the steel strip 1 is placed over a hot thickness measuring system 8 for measuring the thickness of the zinc layer and via a temperature measuring device 9 into a heat treatment device having two continuous furnaces 10, 11 13 initiated.
  • the galvanized steel strip is primarily heated 1 to the required annealing temperature.
  • the steel strip 1 primarily kept at a constant annealing temperature.
  • the radiation emission is determined by means of a pyrometer 14 of the finished annealed steel strip 1 measured. Then there are cooling devices on the belt guide 15 arranged. At a location downstream of the heat treatment device 13 of the belt path 3 there is also a measuring device 16 is provided for measuring the iron content of the Zn-Fe layer. the preferably as by the double arrow 17 indicated. Can be moved across the bandwidth so that at different points in the bandwidth a measurement can be carried out.
  • the measuring device works according to the X-ray method.
  • a controller 19 coupled to a process computer 18 is provided with heating devices of the two continuous furnaces 10, 11 coupled to adjust the heating power. as illustrated by the double arrows 20.
  • the aluminum dissolved in zinc bath 5 initially forms an iron-aluminum layer (Fe 2 Al 5 ) on the steel strip due to its higher affinity for iron. which prevents a reaction of the iron substrate of the steel strip 1 and the zinc layer.
  • This system (steel strip 1 + Fe-Al layer + liquid Zn layer) enters the first continuous furnace 10 and is brought to a temperature of 450 ° C to 700 ° C.
  • the steel strip 1 is kept at a certain temperature or heated even further.
  • the process of diffusion of iron into the zinc layer that occurs converts the pure zinc layer into a zinc-iron layer.
  • the Fe-Al barrier layer formed in the zinc bath is formed by the Zn-Fe growth at the grain boundaries of the base material is broken up, and a mushroom-shaped growth of the Zn-Fe complexes begins. Depending on the iron content different metallurgical phases are formed. that have different properties.
  • Iron content of the Fe-Zn layer is determined, preferably via the entire bandwidth and also over the entire band length.
  • This The actual value of the iron content of the Zn-Fe layer is determined using the Controller 19 with a value of the predetermined as a reference variable Iron content of the Zn-Fe layer compared.
  • a possible one Control deviation is over the controller 19 by changing the the heating output of the first or the second continuous furnace 10, 11 balanced. Is that about measured iron content less than the desired, the Heating capacity of the continuous furnace increased until the Control deviation becomes zero or below a specified value has dropped (dead band), as is shown in FIG. 2 below is explained:
  • the course I gives the relationship between the Fe content of the Zn-Fe layer and heating output. This is determined empirically and e.g. as a formula or in tabular form Control computer (controller 19) provided.
  • the steel strip 1 behaves exactly according to the course I, the desired setting of the Fe content Fe 1 (point A) is achieved with the power setting P 1 . If the strip behaves somewhat differently, e.g. according to curve II, due to unintentional changes in process parameters, such as drift of the ambient temperature, drift in the transformer output when the continuous furnaces are electrically heated or if other faults occur, the strip will have an Fe content of Fe 2 which deviates from the nominal value Fe 1 (point B).
  • the heating power is now changed, for example depending on the slope dP / dFe in point A'des course I, for example by the value k. dP dFe . ⁇ Fe
  • Desired changes in process parameters e.g. on Changing the dimension of the steel strip 1, changing the chemical composition of the steel strip 1, a change of Zinc layer thickness or a change in the conveying speed of the Steel strip 1, to take into account the heat output of the Heat treatment device entered the process computer 18.
  • the emissivity of the coating changes abruptly as soon as the surface of the Zn-Fe layer has iron (see FIG. 4), can make a radiation emission measurement using a pyrometer 14 used to assess the galvanized layer become.
  • the pyrometer 14 can after or in the Heat treatment device 13 (e.g. between galvannealing furnace 10 and holding furnace 11) can be arranged. In this measurement it is information about the purely of the Surface of the steel strip 1, i.e. its Zn-Fe layer, emitted radiant energy, which is a function of temperature and the emission number of the surface condition.
  • the heating power of the continuous furnaces 10, 11th with the help of the controller connected to a process computer 18 19, to which the measured value of the pyrometer is entered, increases until a reaction through the pyrometer can be determined.
  • the heating power is the control variable of the control process.
  • the heating power of the continuous furnaces 10, 11 is now using the Regulator 19 controlled so that the reaction from one certain desired position is completed. Another Possibility of recognizing the point in the tape running direction at the the through reaction is complete, the pyrometer measurement to compare with a thermal model calculation.
  • the pyrometer measurement is the empirically determined one Emissivity for the pure zinc layer and a second time empirically determined emissivity of the fully reacted layer based on. In terms of calculations, this initially results in two different according to the different emission numbers Pyrometer temperature values for the running belt.
  • the Zn-Fe layer has an Fe content within narrow limits and that at the same time the coating is complete is fully reacted. Because from the information about the Fe content of the Zn-Fe layer alone cannot be closed immediately, that the coating has also reacted, it is advantageous the heat output distribution over the length of the heat treatment device due to a combination of the two information, namely the Fe content of the Zn-Fe layer and the Emissivity determination.
  • Each of the control methods described above is in one closed loop operated.
  • the manipulated variables for the heat treatment device 13 are from a computer of the controller 19 from the measured values and the target-actual deviation for the iron content and, if applicable calculated for emissivity.
  • the measured values can be used the hot measurement (layer thickness measurement) and / or one before Afterglow furnace arranged temperature measurement, the Belt speed, the heating power supplied in the individual zones of the heat treatment device 13 are used to increase the accuracy of the control process, as indicated by the arrows 20, 21.
  • the manipulated variables are calculated using a Rule model, which corresponds to the on the specific system for Available measuring devices and control devices can be different.
  • a Rule model corresponds to the on the specific system for Available measuring devices and control devices can be different.
  • Base material, tape dimension, Al content in the zinc bath can from a higher-level computer (e.g. Production planning computer) or an external input unit are transmitted to the process computer 18.
  • You can use the target value for the product to be manufactured to the computer of the controller 19 are transmitted, cf. Arrow 22.
  • the computer of the controller 19 then calculates taking into account this model parameter of the control model the corresponding Control commands.
  • the total output or the performance of parts of the continuous furnaces 10, 11 (zones in Belt length direction) is set within certain limits become. It is particularly advantageous if the distribution of the Heat input on the belt, i.e. the heating power of the Continuous furnaces 10, 11, also within the width certain limits can be set, since this makes it possible to achieve the deviation shown in FIG. 3 of the Fe content of the Zn-Fe layer, which can occur despite the uniform thickness of the Zn-Fe layer.

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Electroplating Methods And Accessories (AREA)

Claims (10)

  1. Procédé pour la galvanisation d'une bande (1), en particulier d'une bande en acier (1), dans lequel la bande (1) est revêtue en continu de zinc dans un procédé de passage continu, soit de façon électrolytique, soit selon le procédé de galvanisation à chaud dans un bain de zinc, et ensuite, cette bande est soumise à un traitement à chaud dans un four de passage continu (10, 11) pour former une couche Zn-Fe, et de plus elle est soumise à un contrôle en ligne de la couche de zinc en mesurant la teneur en fer de la couche de zinc au moyen de la fluorescence aux rayons X, l'opération de galvanisation étant commandée en dépendance de la teneur en fer de la couche de zinc, caractérisé en ce que l'on détermine une valeur de la teneur en fer de la couche Zn-Fe en tant que grandeur pilote, on compare la valeur réelle de la teneur en fer de la couche Zn-Fe avec la grandeur pilote, et on compense un écartement de réglage via un régulateur (19) dans un circuit de réglage fermé à l'aide d'un ordinateur qui enregistre l'écartement de réglage et qui règle au moyen d'ordres de réglage la puissance calorifique du four de passage continu (10, 11), en prenant en considération la dimension de la bande, le matériau de base de la bande (1) en ce qui concerne sa composition chimique et/ou sa structure, l'épaisseur de la couche de zinc, la composition du bain de zinc, comme par exemple sa teneur en Al, la vitesse de la bande, et le cas échéant d'autres paramètres, comme la température de la bande (1) à l'entrée du four de passage continu (10, 11) et la température ambiante.
  2. Procédé selon la revendication 1, caractérisé en ce que pour la détection d'une réaction entière de la couche Zn-Fe, l'émission de rayonnement de la surface de la bande (1) est mesurée après ou pendant le traitement thermique au moyen d'au moins un pyromètre (14).
  3. Procédé selon la revendication 2, caractérisé en ce que l'on détermine, sur le trajet de passage de bande (3), par mesure au moyen de plusieurs pyromètres (14) agencés les uns derrière les autres en direction de circulation de bande (6), cet emplacement à partir duquel la couche Zn-Fe a entièrement réagi, et en ce que par réglage de la puissance calorifique du four de passage continu (10, 11), cet emplacement est amené en direction de circulation de bande (6) avant un emplacement limite à partir duquel la couche Zn-Fe doit au plus tard avoir réagi entièrement.
  4. Procédé selon l'une ou plusieurs des revendications 1 à 3, caractérisé en ce que la puissance calorifique et ainsi la température peuvent être réglées différemment à l'intérieur du four de passage continu (10, 11) dans des zones de réchauffement individuelles (12, 12').
  5. Procédé selon la revendication 4, caractérisé en ce que la puissance calorifique peut être réglée différemment dans des zones de réchauffement (12, 12') situées les unes à côté des autres en direction de la largeur de bande.
  6. Procédé selon l'une ou l'autre des revendications 4 et 5, caractérisé en ce que la puissance calorifique peut être réglée différemment dans des zones de réchauffement situées les unes derrière les autres en direction du passage de la bande.
  7. Procédé selon l'une ou plusieurs des revendications 4 à 6, caractérisé en ce que la mesure de la teneur en fer et/ou de l'émission de rayonnement s'effectue à des emplacements agencés en répartition sur la largeur de la bande.
  8. Installation pour la mise en oeuvre du procédé selon l'une ou plusieurs des revendications 1 à 7, comportant un dispositif de guidage de bande (2) guidant une bande (1) le long d'un trajet de passage de bande (3), un dispositif de revêtement de zinc (4) agencé sur le trajet de passage de bande (3), un dispositif de traitement thermique (13) agencé à la suite et formé par un four de passage en continu pour la bande (1), et un dispositif de mesure (16) situé également sur le trajet de passage de bande (3) et agencé en aval du dispositif de traitement thermique (13), pour mesurer la teneur en fer de la couche de zinc, caractérisée en ce que le dispositif de mesure (16) est accouplé à un régulateur (19) qui est accouplé via une ligne de commande au dispositif de chauffage du dispositif de traitement thermique (13).
  9. Installation selon la revendication 8, caractérisée en ce que le régulateur (19) est accouplé à un ordinateur de traitement (18).
  10. Installation selon l'une ou l'autre des revendications 8 et 9, caractérisée en ce qu'il est prévu au moins un dispositif de mesure de rayonnement supplémentaire réalisé sous la forme d'un pyromètre (14) agencé sur le trajet de passage de bande (3) après ou dans le dispositif de traitement thermique (13), qui est également accouplé au régulateur (19).
EP93890053A 1992-03-31 1993-03-23 Procédé pour galvaniser un feuillard et installation pour la mise en oeuvre de ce procédé Expired - Lifetime EP0571353B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT654/92 1992-03-31
AT65492 1992-03-31
AT0065492A AT397815B (de) 1992-03-31 1992-03-31 Verfahren zum verzinken eines bandes sowie anlage zur durchführung des verfahrens

Publications (4)

Publication Number Publication Date
EP0571353A2 EP0571353A2 (fr) 1993-11-24
EP0571353A3 EP0571353A3 (fr) 1994-01-26
EP0571353B1 EP0571353B1 (fr) 1996-01-31
EP0571353B2 true EP0571353B2 (fr) 2000-01-26

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ID=3496298

Family Applications (1)

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EP93890053A Expired - Lifetime EP0571353B2 (fr) 1992-03-31 1993-03-23 Procédé pour galvaniser un feuillard et installation pour la mise en oeuvre de ce procédé

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Country Link
EP (1) EP0571353B2 (fr)
JP (1) JPH06207297A (fr)
AT (2) AT397815B (fr)
DE (1) DE59301528D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10021948A1 (de) * 2000-05-05 2001-11-22 Thyssenkrupp Stahl Ag Verfahren und Anlage zum Verzinken eines Stahlbandes

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405770B (de) * 1997-09-24 1999-11-25 Voest Alpine Ind Anlagen Verfahren zur regelung eines ''galvannealing''-prozesses
KR100825975B1 (ko) * 2003-07-29 2008-04-28 뵈스트알파인 스탈 게엠베하 경화 강판 부품의 제조 방법
WO2009021279A1 (fr) * 2007-08-10 2009-02-19 Bluescope Steel Limited Commande de ligne de revêtement

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307968A (en) * 1963-09-03 1967-03-07 Armco Steel Corp Method and apparatus for controlling the alloying of zinc coatings
JPH068791B2 (ja) * 1984-02-10 1994-02-02 川崎製鉄株式会社 合金化亜鉛めつき鋼板の合金化度の測定方法
FR2563537A1 (fr) * 1984-04-25 1985-10-31 Stein Heurtey Procede et dispositif de recuit de diffusion pour l'obtention de toles a revetement allie
US4659437A (en) * 1985-01-19 1987-04-21 Tokusen Kogyo Kabushiki Kaisha Method of thermal diffusion alloy plating for steel wire on continuous basis
JPH01252761A (ja) * 1987-12-08 1989-10-09 Kawasaki Steel Corp 溶融亜鉛めっき用合金化炉の板温制御装置
JPH0637702B2 (ja) * 1988-09-29 1994-05-18 川崎製鉄株式会社 溶融亜鉛めっき合金化炉の燃料制御方法
JP2904891B2 (ja) * 1990-08-31 1999-06-14 日新製鋼株式会社 合金化亜鉛めつき鋼板のオンライン合金化度測定装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10021948A1 (de) * 2000-05-05 2001-11-22 Thyssenkrupp Stahl Ag Verfahren und Anlage zum Verzinken eines Stahlbandes
DE10021948B4 (de) * 2000-05-05 2004-02-19 Thyssenkrupp Stahl Ag Verfahren und Anlage zum Verzinken eines Stahlbandes

Also Published As

Publication number Publication date
JPH06207297A (ja) 1994-07-26
EP0571353A2 (fr) 1993-11-24
EP0571353B1 (fr) 1996-01-31
DE59301528D1 (de) 1996-03-14
EP0571353A3 (fr) 1994-01-26
AT397815B (de) 1994-07-25
ATA65492A (de) 1993-11-15
ATE133717T1 (de) 1996-02-15

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