EP0451020B1 - Vorrichtung zur kontinuierlichen Oberflächenbeschichtung von einem Stahlband - Google Patents

Vorrichtung zur kontinuierlichen Oberflächenbeschichtung von einem Stahlband Download PDF

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Publication number
EP0451020B1
EP0451020B1 EP91400817A EP91400817A EP0451020B1 EP 0451020 B1 EP0451020 B1 EP 0451020B1 EP 91400817 A EP91400817 A EP 91400817A EP 91400817 A EP91400817 A EP 91400817A EP 0451020 B1 EP0451020 B1 EP 0451020B1
Authority
EP
European Patent Office
Prior art keywords
liquid metal
crucible
rollers
accordance
pinching
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
EP91400817A
Other languages
English (en)
French (fr)
Other versions
EP0451020A1 (de
Inventor
Charles Domaine Du Bois Saint-Denis Brun
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 EP0451020A1 publication Critical patent/EP0451020A1/de
Application granted granted Critical
Publication of EP0451020B1 publication Critical patent/EP0451020B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • 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
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • 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
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
    • C23C2/523—Bath level or amount

Definitions

  • the subject of the present invention is a device for continuously coating a steel strip using a liquid metal, in particular zinc, zinc-aluminum or aluminum.
  • the present invention is particularly suitable for continuous hot-dip galvanizing.
  • the steel strip is immersed in the bath of liquid metal contained in a crucible and the path of said strip in the crucible is about 2.50 meters.
  • the iron of the strip is attacked by the bath of liquid metal and dissolves in said bath.
  • the iron reacts with the elements of the bath to form solid intermetallic compounds in the form of particles, zinc-iron, zinc-iron-aluminum, or zinc-aluminum in the case of galvanization by quenching at hot.
  • These particles have a size ranging from a few microns to several hundred microns depending on the degree of saturation of the bath. Given the continuous stirring of the bath and according to their density and composition, these particles rise to the surface, or remain in saturation or even settle at the bottom of the bath. Consequently, the particles can be entrained by the strip and remain included in the coating. However, particle inclusions are detrimental to the surface appearance and to the use of hot-dip galvanized sheet, in particular for visible parts of the automobile body.
  • the large volume of the crucible has the drawback of making it difficult to purify the bath by filtration and of increasing the time necessary for any change in the composition of said bath.
  • the device comprises two pinching rollers with a horizontal axis between which the strip is driven continuously from bottom to top, means for continuously feeding the purified liquid metal, from said main crucible, at the level of the nip of the two rollers forming a zone for coating said strip and means for recovering and recycling in the main crucible the excess liquid metal flowing between the two pinch rollers.
  • the object of the present invention is to propose a device for continuously coating a steel strip which has the particular advantage of being able to continuously filter the entire bath after pollution in contact with the strip, while allowing corrections rapid composition of the bath.
  • the coating device comprises an enclosure 1 inside which a steel strip 2 passes.
  • the coating device also comprises, below the enclosure 1, a crucible main 3 containing liquid metal consisting of pure zinc without aluminum or lead.
  • This crucible is provided with heating means, not shown, for example by induction.
  • the enclosure 1 comprises an inlet airlock 5 provided with guide cylinders 5a and an outlet airlock 6, the two airlocks being supplied with pure nitrogen.
  • This enclosure 1 comprises, between the two airlocks 5 and 6, two pinch rollers 7 and 8, with a horizontal axis, motorized and between which the steel strip 2 is driven continuously from bottom to top.
  • the rollers 7 and 8 define a nip interval 9 which forms a coating zone 10 by partial retention of the liquid metal, as will be seen later.
  • the coating device also comprises means for supplying liquid metal into the coating zone 10 from the main crucible 3.
  • auxiliary crucible 11 provided with heating means 12, for example by induction, and arranged in the enclosure 1 above the rollers 7 and 8.
  • the auxiliary crucible 11 having a capacity of the order of two tonnes is connected to the main crucible 3 by a pipe 13 comprising a pump 14 with an adjustable flow rate from two tonnes to ten tonnes per hour, so as to transfer the liquid metal from the main crucible 3 to the auxiliary crucible 11.
  • a second pump can be mounted in parallel and put into service in case of failure of the first.
  • the auxiliary crucible 11 is provided at its upper part with an overflow spout 15 communicating with a trough 16 comprising at its lower part two supply ramps 17 disposed above the nip interval 9 of the rollers 7 and 8, each ramp 17 being placed on either side of the steel strip 2 (Fig. 2).
  • the supply ramps 17 are also connected to the base of the auxiliary crucible 11 by a pipe 18 forming an annex circuit closed by a buffer nozzle 19 at the bottom of said auxiliary crucible 11.
  • This auxiliary circuit 18 is closed in normal operation and can be opened in the event of a failure of the pump 14 so as to supply the coating zone 10 with the liquid metal contained in the auxiliary crucible 11 for 10 to 20 minutes.
  • the auxiliary crucible 11 also comprises a hopper 20 for correcting the quality of the liquid metal contained in said crucible 11, for example by the addition of elements such as, for example, aluminum, lead, or bismuth.
  • the pinch rollers 7 and 8 include a coating resistant to thermal stresses and not wetted by the liquid metal and are provided with wiping members, not shown, for example with nitrogen for preventing entrainment of liquid metal on the surface of said rollers.
  • the coating of the pinch rollers 7 and 8 may consist of a thin ceramic coating on steel, or a coating of non-porous and non-cracked molybdenum on steel.
  • Pinch rollers 7 and 8 can also be formed by ferrule rollers in silica or ceramic.
  • pinch rollers 7 and 8 may also include internal heating means, not shown, constituted for example by electric heating candles or a gas radiant tube, to minimize thermal stresses.
  • the horizontal axes of the pinch rollers 7 and 8 can be offset vertically relative to each other to avoid bending the steel strip 2 as it passes around one of the rollers and in the nip interval of said rollers.
  • Wringing means formed, for example by ramps 21 placed on either side of the steel strip 2, are disposed about one meter above the coating zone 10.
  • the steel strip 2 is wrung pneumatically under nitrogen with recirculation.
  • two pads 22 are applied for example by jacks 23 in said interval at an adjustable distance from the edge of the strip d steel 2.
  • pads 22 can be made of graphite or amorphous carbon or made of compacted fibrous ceramic materials or of organic materials resistant to high temperatures (up to 500 ° C.) under nitrogen protection.
  • the coating device also includes means for recovering and recycling the excess liquid metal flowing through the nip 9 of the rollers 7 and 8.
  • These means consist of a retention tank 25 made of refractory material disposed below said nip interval 9 and the bottom of which comprises two orifices 26a which can be closed alternately by a buffer nozzle 26.
  • each orifice 26a is placed a recovery crucible 27 each provided with heating means 28, for example by induction, and possibly with a filter 29.
  • Each crucible 27 is connected by a funnel 30 to the main crucible 3.
  • the liquid metal returns directly to the main crucible.
  • each recovery crucible 27 is provided with means 31 for detecting the overflow of the liquid metal of said crucible formed for example by a photoelectric cell targeting the overflow spout 27a of the corresponding crucible (FIG. 1).
  • the coating device according to the invention operates in the following manner.
  • the main crucible 3 is filled with liquid metal, in particular pure zinc without aluminum or lead, the liquid metal being maintained at the desired temperature by the heating means.
  • the pump 14 transfers the liquid metal via line 13 into the auxiliary crucible 11 where it is maintained at the desired temperature by the heating means 12.
  • the liquid metal in particular zinc
  • the liquid metal can be corrected by additions to the hopper, for example aluminum, lead or bismuth.
  • the temperature of the liquid metal can also be modified by the heating means 12.
  • the liquid metal necessary for coating the steel strip 2 feeds, by overflow from the auxiliary crucible 11, the nip interval 9 of the rollers 7 and 8 via the chute 16 and ramps 17.
  • the steel strip 2 entrained by the rollers 7 and 8 therefore crosses the coating zone 10 filled with liquid metal and is wrung by the ramps 21 at about one meter from its exit from said coating zone 10.
  • the height of the liquid metal in the coating zone 10 is regulated by acting on the flow rate of the pump 14 for a fixed position of the pads 22.
  • the height of the liquid metal in the coating zone 10 can also be controlled by acting on the distance of the pads 22 from the edges of the steel strip 2 so as to avoid any risk of liquid metal overflowing and to prevent leaks. liquid metal to the bearings of the rollers 7 and 8.
  • the supply of liquid metal to the area coating 10 can be ensured by the liquid metal contained in said auxiliary crucible for 10 to 20 minutes, by opening the buffer nozzle 19 located at the bottom of the auxiliary crucible 11 so as to feed the ramps 17.
  • the overflow of the liquid metal from the recovery crucible 17 in service is detected by the photoelectric cell 31 targeting the overflow spout 27 of the crucible and causes the change of the filtration crucible.
  • the liquid metal purified by the filter 29 returns to the main crucible 3 through the funnel 30.
  • the coating of the steel strip 2 can be removed at any time by stopping the pump 14.
  • the means for continuously feeding the liquid metal into the coating zone 10 are formed by the line 13 comprising at least one feed pump 14 and connected directly to the supply ramp 17 located at the above said coating zone 10.
  • the device operates without the auxiliary crucible 11, the liquid metal being pumped directly from the main crucible 3.
  • the device according to the invention makes it possible, under equal galvanizing conditions, to limit the quantity of zinc brought into contact with the steel strip to what is necessary for said galvanizing, while obtaining normal adhesion. It also allows rapid corrections to the composition of the liquid metal bath and to limit the addition of aluminum to the strict necessary quantity and only for products that require it.
  • the method according to the invention makes it possible to continuously filter all the liquid metal after pollution on contact with the steel strip and consequently to limit the amount of intermetallic compounds present in the bath, which makes it possible to improve the surface appearance. sheet metal in particular for visible parts of the automobile body.
  • the device according to the invention also has the advantage of being able to operate continuously even in the event of incidents and of being able to be installed without dismantling the normal equipment of the installations used until now.
  • Another advantage of the device according to the invention lies in the fact that it can be easily installed in a continuous annealing line.
  • this type of installation comprises two rollers with horizontal axis between which the steel strip is driven continuously from bottom to top and which play the role of the annealing system.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating Apparatus (AREA)
  • Coating With Molten Metal (AREA)
  • Spray Control Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (13)

  1. Vorrichtung zur kontinuierlichen Oberflächenbeschichtung eines Stahlbandes (2) mit Hilfe eines flüssigen Metalls, das in einer Hauptwanne (3) enthalten ist, die mit Heizeinrichtungen versehen ist, mit
    - zwei Klemmrollen (7, 8) mit horizontalen Achsen, zwischen denen das Stahlband (2) kontinuierlich von unten nach oben geführt wird,
    - Einrichtungen zur kontinuierlichen Zuführung des gereinigten flüssigen Metalls von der Hauptwanne (3) in den Bereich des Klemmspaltes (9) der beiden Rollen (7, 8), der eine Beschichtungszone (10) des Bandes (2) bildet,
    - Rückgewinnungs- und Rückführeinrichtungen (25, 27, 30) in der Hauptwanne (3) für überschüssiges flüssiges Metall, das zwischen den beiden Klemmrollen (7, 8) abläuft, und
    - Einrichtungen (14, 22, 23) zur Regulierung der Höhe des gereinigten flüssigen Metalls in der Beschichtungszone (10),
    dadurch gekennzeichnet, daß die Einrichtungen zur kontinuierlichen Zuführung des flüssigen Metalls in die Beschichtungszone (10) durch mindestens eine Hilfswanne (11) gebildet sind, die mit Heizeinrichtungen (12) versehen und über eine mit mindestens einer Speisepumpe (14) versehene Leitung (13) mit der Hauptwanne (3) in Verbindung steht sowie mindestens eine Speiserampe (17) aufweist, die über der Beschichtungszone (10) angeordnet ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Rampe (17) durch Überlauf der Hilfswanne (11) mit flüssigem Metall versorgt wird.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Rampe (17) über einen Erweiterungskreis (18, 19), der mit der Basis der Hilfswanne (11) in Verbindung steht, mit flüssigem Metall versorgt wird.
  4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Steuereinrichtungen für das Ablaufen des flüssigen Metalls zwei Schuhe (22) aufweisen, die im Klemmspalt (9) der beiden Rollen (7, 8) im Bereich des Austritts des Stahlbandes (2) aus den Rollen sowie beiderseits des Stahlbandes angeordnet sind.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Schuhe (22) vertikal und horizontal relativ zu den Rändern des Stahlbandes (2) verschiebbar sind.
  6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Horizontalachsen der Klemmrollen (7, 8) vertikal versetzt angeordnet sind, um ein Durchbiegen des Stahlbandes während seines Laufes um eine der Rollen (7, 8) und im Klemmspalt (9) der Rollen (7, 8) zu verhindern.
  7. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Klemmrollen (7, 8) eine gegenüber thermischen Spannungen widerstandsfähige nicht mit dem flüssigen Metall benetzte Beschichtung aufweisen.
  8. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Klemmrollen (7, 8) innere Heizeinrichtungen aufweisen, um die thermischen Spannungen zu minimieren.
  9. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jede Klemmrolle (7, 8) Trocknungsorgane, beispielsweise mit Hilfe von Stickstoff, aufweist, um das Mitführen des flüssigen Metalls auf der Oberfläche der Rolle zu verhindern.
  10. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Rückgewinnungs- und Rückführeinrichtungen in der Hauptwanne (3) für überschüssiges flüssiges Metall mindestens einen Rückhaltebehälter (25) aus feuerfestem Material umfassen, der unterhalb des Klemmspaltes (9) der Rollen (7, 8) angeordnet ist und mit mindestens einer Rückgewinnungswanne (27) in Verbindung steht, die mit Heizeinrichtungen (28) versehen und mit der Hauptwanne (3) verbunden ist.
  11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die Rückgewinnungs- und Rückführeinrichtungen zwei parallel angeordnete Rückführungswannen (27) aufweisen, die abwechselnd von dem Rückhaltebehälter (25) versorgt werden.
  12. Vorrichtung nach den Ansprüchen 10 und 11, dadurch gekennzeichnet, daß die Rückgewinnungswanne (27) mindestens ein Filterorgan (29) für das flüssige Metall aufweist.
  13. Vorrichtung nach den Ansprüchen 10 und 11, dadurch gekennzeichnet, daß die Rückgewinnungswanne (27) einen Detektor für den Überlauf (31) des flüssigen Metalls besitzt.
EP91400817A 1990-03-28 1991-03-26 Vorrichtung zur kontinuierlichen Oberflächenbeschichtung von einem Stahlband Expired - Lifetime EP0451020B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9003963A FR2660325B1 (fr) 1990-03-28 1990-03-28 Procede et dispositif de revetement en continu d'une bande d'acier.
FR9003963 1990-03-28

Publications (2)

Publication Number Publication Date
EP0451020A1 EP0451020A1 (de) 1991-10-09
EP0451020B1 true EP0451020B1 (de) 1995-07-19

Family

ID=9395205

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400817A Expired - Lifetime EP0451020B1 (de) 1990-03-28 1991-03-26 Vorrichtung zur kontinuierlichen Oberflächenbeschichtung von einem Stahlband

Country Status (6)

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EP (1) EP0451020B1 (de)
AT (1) ATE125309T1 (de)
DE (1) DE69111281T2 (de)
ES (1) ES2075380T3 (de)
FR (1) FR2660325B1 (de)
GR (1) GR3017314T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140048330A (ko) * 2011-08-24 2014-04-23 다니엘리 앤드 씨. 오피시네 메카니케 쏘시에떼 퍼 아찌오니 연속 용융 도금 및 이와 관련된 코팅 프로세스에 의해 평평한 금속 제품을 도금하기 위한 플랜트

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4208578A1 (de) * 1992-03-13 1993-09-16 Mannesmann Ag Verfahren zum beschichten der oberflaeche von strangfoermigem gut
DE10343648A1 (de) * 2003-06-27 2005-01-13 Sms Demag Ag Vorrichtung zur Schmelztauchbeschichtung eines Metallstranges und Verfahren zur Schmelztauchbeschichtung
DE10361055A1 (de) * 2003-12-22 2005-07-21 Eap Lachnit Gmbh Verfahren und Einrichtung zum Beschichten der Oberfläche von Stücken

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Publication number Priority date Publication date Assignee Title
FR1248834A (fr) * 1960-02-17 1960-12-23 Continental Can Co Procédé et appareil pour revêtir d'aluminium un métal de base
US3828723A (en) * 1973-05-17 1974-08-13 Thompson E Galvanizing apparatus for wire and the like
FR2341199A1 (fr) * 1976-02-11 1977-09-09 Commissariat Energie Atomique Procede et dispositif de formation et de depot sur un substrat de couches monomoleculaires de molecules amphiphiles
JPS60245774A (ja) * 1984-05-18 1985-12-05 Kobe Steel Ltd 溶融メツキ方法
JPS63140070A (ja) * 1986-12-03 1988-06-11 Nkk Corp 溶融めつき浴中の微小不純物除去装置
JPH0610331B2 (ja) * 1987-02-05 1994-02-09 川崎製鉄株式会社 溶融金属めつき装置
JPH01139744A (ja) * 1987-11-25 1989-06-01 Nippon Steel Corp 溶融メッキ装置
JPH01180954A (ja) * 1988-01-13 1989-07-18 Kobe Steel Ltd 溶融金属めっき装置
JPH0215155A (ja) * 1988-07-04 1990-01-18 Hitachi Ltd 連続式溶融メツキ装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140048330A (ko) * 2011-08-24 2014-04-23 다니엘리 앤드 씨. 오피시네 메카니케 쏘시에떼 퍼 아찌오니 연속 용융 도금 및 이와 관련된 코팅 프로세스에 의해 평평한 금속 제품을 도금하기 위한 플랜트

Also Published As

Publication number Publication date
FR2660325B1 (fr) 1994-01-21
EP0451020A1 (de) 1991-10-09
GR3017314T3 (en) 1995-12-31
DE69111281T2 (de) 1995-12-21
FR2660325A1 (fr) 1991-10-04
ATE125309T1 (de) 1995-08-15
DE69111281D1 (de) 1995-08-24
ES2075380T3 (es) 1995-10-01

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