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WO2001086017A1 - Procede et dispositif de galvanisation d'une bande d'acier - Google Patents

Procede et dispositif de galvanisation d'une bande d'acier Download PDF

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Publication number
WO2001086017A1
WO2001086017A1 PCT/EP2001/004810 EP0104810W WO0186017A1 WO 2001086017 A1 WO2001086017 A1 WO 2001086017A1 EP 0104810 W EP0104810 W EP 0104810W WO 0186017 A1 WO0186017 A1 WO 0186017A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel strip
furnace
strip
emission
radiation
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.)
Ceased
Application number
PCT/EP2001/004810
Other languages
German (de)
English (en)
Inventor
Wolfram RÖSSLER
Heinz-Günter Schwanke
Harald Henkemeyer
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Stahl 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
Application filed by ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Priority to AU2001260262A priority Critical patent/AU2001260262A1/en
Publication of WO2001086017A1 publication Critical patent/WO2001086017A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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 galvanizing a steel strip, in which the steel strip is a
  • the invention further relates to a system for galvanizing a steel strip with a plurality of treatment devices arranged one behind the other, namely a coating device for zinc, a continuous furnace and in particular a warming zone, with strip guiding and transport means that guide the steel strip through the various treatment devices, and with a control device that the Controls furnace output as a function of measured values of at least one measuring device arranged behind the continuous furnace for a characteristic value of the strip surface, in particular an emission radiation measuring device.
  • a steel strip is coated with zinc and then heat-treated (diffusion annealed). During this heat treatment, the zinc coating alloys with iron from the Steel strip, so that an iron-zinc alloy layer with about 90% zinc and 10% iron is formed. While a galvanized strip surface has a silvery shine, an iron-zinc alloy layer is mouse gray and matt if it is alloyed, while only areas that are alloyed are lighter. In the case of an optimally treated steel strip, the coating is alloyed down to the edge areas. The edge areas, on the other hand, are only alloyed due to a process-related slightly thicker zinc layer and lower treatment temperatures.
  • Radiation emission from the strip surface during or after the heat treatment (EP 0 564 437 AI).
  • the heat treatment is carried out by controlling the heating power of a continuous furnace. It is based on the alleged knowledge that the through reaction (optimal alloy state) can be recognized by a strong increase in the emission radiation. In order to avoid an overreaction during the steel strip passing through the continuous furnace and possibly the warming zones, it is necessary to determine the emission radiation of the surface of the strip at several points of the continuous furnace and the warming zones lying one behind the other. Only then can you intervene in the right place at the right place in a timely manner.
  • the invention has for its object to provide a method and a system for galvanizing a steel strip with a Zn-Fe alloy layer, in which or in which an optimal alloy state of the Zn-Fe alloy layer can be achieved.
  • This object is achieved according to the invention in the method mentioned at the outset that, in the event of a control deviation of the characteristic measured values of the emission radiation or the gray value of the steel strip recorded as a controlled variable, the furnace performance in the middle and in the edge regions thereof in the sense of an approximation to those which are decisive for an optimal alloy state of the strip surface , corresponding characteristic values are adjusted.
  • the object is achieved in that the measuring device supplies measured values for the radiation emission of the strip surface in the central region of the steel strip and on its edges, and the control device forms the manipulated variable for the furnace output from the comparison of these measured values.
  • the invention is based on the knowledge that the alloy state of the Zn-Fe layer of the steel strip can be determined very precisely by comparing the emission radiation or the gray value of the strip surface in the middle of the strip with the corresponding values at the strip edges. This is due to the fact that the emission radiation is the greatest in an optimal alloy state or the gray value is medium gray and matt, while the emission radiation is lower or the gray value is lighter and glossy in the case of a non-optimal alloy state. That is why the invention also sees According to one embodiment, the furnace output is adjusted in terms of a maximum of the difference value for the emission radiation or the gray value of the steel strip, which is determined from the mean values of the emission radiation or the gray value of the steel strip in the middle area and in the peripheral areas.
  • the manipulated variable formed from these measured values for the control serving for fine control
  • a manipulated variable formed from the measured values of the emission radiation and / or temperature of the steel strip measured at the exit of the furnace serves for a rough control. Since, as a rule, alloying at the outlet of the furnace has not yet taken place, but rather temperature treatment in the holding zone is still required for the alloying, exclusive regulation depending on the measured values within or at the end of the holding zones would result in an undesirable late reaction in the Adjust the furnace output. However, since the expected state of the alloy can already be roughly recognized at the exit of the furnace, it is advantageous to derive a first manipulated variable from a measured value at this point, so that only a fine control has to be carried out afterwards.
  • FIG. 1 shows a system for galvanizing a steel strip with subsequent heat treatment in a schematic illustration
  • Figure 2 shows a system for galvanizing a steel strip with subsequent heat treatment in a schematic representation in a different embodiment to Figure 1
  • FIG. 3 shows a diagram for the emission radiation as a function of the furnace output.
  • a steel strip 1 is passed over a roll 2a through a bath 2b made of liquid zinc of a coating system 2. Scraper nozzles 3 scrape off excess zinc.
  • the steel strip then passes into a continuous furnace 4 with a series of induction coils with which the heating power of the continuous furnace 4 can be controlled.
  • a measuring device for the emission radiation and the temperature 5, namely a special pyrometer, is arranged at the outlet of the furnace 4.
  • the steel strip 1 then passes through two warming zones 6, 7, namely a stationary 6 and a movable 7. At the exit of the warming zone 7, a measuring device 8a, 8b for the emission radiation of the surfaces of the steel strip 1 is arranged on each side of the steel strip.
  • measuring devices 8a, 8b are able, on the one hand, to detect the emission radiation in the areas of both band edges and, on the other hand, in the central area of the steel band and to supply corresponding measured values for this.
  • the steel strip 1 then passes through a cooling zone 9 in order to then be transported further via a deflection roller 10, for example to a reel.
  • the measuring devices 5, 8a, 8b deliver measured values about the emission radiation to a controller 11.
  • the measuring device 5 provides, for example, a measured value for the average emission of the steel strip 1.
  • the measuring devices 8a, 8b supply differentiated measured values, specifically measured values for the regions of the band edges and for the middle band region.
  • the controller 11 processes the measured value of the measuring device 5 into a manipulated variable in order initially to roughly adapt the performance of the continuous furnace. Average values are initially formed from the measured values for the radiation emission supplied by the measuring devices 8a, 8b. The mean values are compared with each other by forming the difference from them:
  • E rRand mean value of the emission radiation on the right
  • the size ⁇ E is plotted against the furnace output. It can be seen that the difference between the mean values of the emission radiation has its maximum at a certain furnace output.
  • the Zn-Fe layer of the metal strip is at this maximum optimally alloyed. Only narrow areas at the edges of the strip, in which a thicker zinc layer has formed due to the process and / or which have not been optimally heat-treated and are cut off when the metal strip is trimmed anyway, are only alloyed.
  • Figure 2 shows a corresponding embodiment. To the extent that there are similarities with the first exemplary embodiment, the corresponding system parts are provided with the same reference symbols.
  • the continuous furnace 4 consists of only one induction coil, while an additional movable warming zone 6 * is provided.
  • the special pyrometers 5 can be arranged behind each warming zone 6, 6 *, 7.
  • Measuring devices 11a, 11b are provided in the form of cameras, which record measured values for gray values of the steel strip 1 illuminated by lighting devices 12a, 12b, specifically measured values for the two edge regions and for the middle band region. These measured values are processed in the same way as the measured values for radiation emission are processed in the exemplary embodiment in FIG. 1.

Landscapes

  • 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)

Abstract

L'invention concerne un procédé et un dispositif de galvanisation d'une bande d'acier (1). L'invention vise à réaliser un alliage parfait entre la couche de zinc et le fer de la bande d'acier (1). A cet effet, la bande métallique (1) est soumise à un traitement thermique lors du passage dans le four (4), ledit traitement thermique étant commandé au centre de la bande et sur les bords de la bande en fonction du rayonnement d'émission de la bande métallique (1) relevé en tant que grandeur de régulation. L'état d'alliage de la bande métallique (1) est parfait lorsqu'on obtient un maximum à partir des valeurs moyennes du rayonnement d'émission de la zone centrale de la bande métallique (1) et des zones marginales.
PCT/EP2001/004810 2000-05-05 2001-04-28 Procede et dispositif de galvanisation d'une bande d'acier Ceased WO2001086017A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2001260262A AU2001260262A1 (en) 2000-05-05 2001-04-28 Method and installation for galvanizing a steel strip

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10021948.9 2000-05-05
DE10021948A DE10021948B4 (de) 2000-05-05 2000-05-05 Verfahren und Anlage zum Verzinken eines Stahlbandes

Publications (1)

Publication Number Publication Date
WO2001086017A1 true WO2001086017A1 (fr) 2001-11-15

Family

ID=7640912

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2001/004810 Ceased WO2001086017A1 (fr) 2000-05-05 2001-04-28 Procede et dispositif de galvanisation d'une bande d'acier

Country Status (3)

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AU (1) AU2001260262A1 (fr)
DE (1) DE10021948B4 (fr)
WO (1) WO2001086017A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009053368A1 (de) * 2009-11-14 2011-05-19 Bayerische Motoren Werke Aktiengesellschaft Verfahren und Fertigungsanlage zum Herstellen eines Blechformteils mit einer Korrosionsschutzbeschichtung
DE102013113708B3 (de) * 2013-12-09 2015-01-22 Thyssenkrupp Ag Vorrichtung zur Beobachtung eines Bereichs eines heißen Metallbandes und/oder Schmelzbades in einem Bandbehandlungsprozess

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0564437A1 (fr) * 1992-03-31 1993-10-06 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour galvaniser un feuillard et installation pour la mise en oeuvre de ce procédé
JPH0711413A (ja) * 1993-06-29 1995-01-13 Nisshin Steel Co Ltd 放射率による合金化度制御方法および装置
US5785772A (en) * 1995-12-06 1998-07-28 Bethlehem Steel Corporation Method and apparatus for controlling galvanneal induction furnace operation
EP0921709A2 (fr) * 1997-12-05 1999-06-09 Mitsubishi Heavy Industries, Ltd. Système d'alliage et dispositif de contrôle de chauffage d'acier affinée galvanisée
EP0992602A1 (fr) * 1998-08-24 2000-04-12 Sms Schloemann-Siemag Aktiengesellschaft Méthode et dispositif pour le contrôle de qualité et règlage du revêtement par immersion de tôles d'acier recuites

Family Cites Families (2)

* 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
AT397815B (de) * 1992-03-31 1994-07-25 Voest Alpine Ind Anlagen Verfahren zum verzinken eines bandes sowie anlage zur durchführung des verfahrens

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP0564437A1 (fr) * 1992-03-31 1993-10-06 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour galvaniser un feuillard et installation pour la mise en oeuvre de ce procédé
JPH0711413A (ja) * 1993-06-29 1995-01-13 Nisshin Steel Co Ltd 放射率による合金化度制御方法および装置
US5785772A (en) * 1995-12-06 1998-07-28 Bethlehem Steel Corporation Method and apparatus for controlling galvanneal induction furnace operation
EP0921709A2 (fr) * 1997-12-05 1999-06-09 Mitsubishi Heavy Industries, Ltd. Système d'alliage et dispositif de contrôle de chauffage d'acier affinée galvanisée
EP0992602A1 (fr) * 1998-08-24 2000-04-12 Sms Schloemann-Siemag Aktiengesellschaft Méthode et dispositif pour le contrôle de qualité et règlage du revêtement par immersion de tôles d'acier recuites

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 04 31 May 1995 (1995-05-31) *

Also Published As

Publication number Publication date
DE10021948B4 (de) 2004-02-19
AU2001260262A1 (en) 2001-11-20
DE10021948A1 (de) 2001-11-22

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