EP1430162A1 - Procede de finissage par immersion a chaud - Google Patents

Procede de finissage par immersion a chaud

Info

Publication number
EP1430162A1
EP1430162A1 EP02800118A EP02800118A EP1430162A1 EP 1430162 A1 EP1430162 A1 EP 1430162A1 EP 02800118 A EP02800118 A EP 02800118A EP 02800118 A EP02800118 A EP 02800118A EP 1430162 A1 EP1430162 A1 EP 1430162A1
Authority
EP
European Patent Office
Prior art keywords
rotors
strip
container
coating
melt
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
EP02800118A
Other languages
German (de)
English (en)
Other versions
EP1430162B1 (fr
Inventor
Rolf Brisberger
Walter Trakowski
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.)
SMS Siemag AG
Original Assignee
SMS Demag 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 SMS Demag AG filed Critical SMS Demag AG
Publication of EP1430162A1 publication Critical patent/EP1430162A1/fr
Application granted granted Critical
Publication of EP1430162B1 publication Critical patent/EP1430162B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/24—Removing excess of molten coatings; Controlling or regulating the coating thickness using magnetic or electric fields

Definitions

  • the invention relates to a method for coating the surface of, in particular, strip-shaped material, for example a non-ferrous metal strip or a steel strip with at least one metallic coating in the course of passing through at least one container holding the molten coating material.
  • the invention also relates to a device for carrying out the method.
  • process 1 The conventional hot-dip coating of strip (called process 1) with Zn, Zn-Al, Al or Al-Si alloys is described in the coating area in that the strip runs into the melt from an annealing furnace with the exclusion of air and by means of a different arrangement of non-driven rollers are deflected into the vertical and stabilized, cf. Figure 1. This applies to all coating metals / alloys listed for hot-dip coating.
  • a disadvantage of method 1 is that the rollers and bearings of the rollers are located in the melt and all materials are exposed to the chemical attack of the melt. The service life of all internals within the melt is limited. Furthermore, a large melting volume with a correspondingly large melting vessel is required in order to accommodate the rolls or the entire bathing equipment. 200 - 400 tons of liquid zinc are common for hot-dip galvanizing. Rapid regulation of the melt with regard to temperature and alloy composition is not possible due to the large volume. Larger fluctuations in the above parameters have to be accepted and may lead to qualitative losses, since alloying measures and the strip quality in the same vessel influence one another. Another disadvantage is that the production speed, particularly in the case of thin strips ⁇ 0.5 mm, cannot be increased in order to achieve an economical system output (approx. 180 m / min). One reason for this is that there is relative movement between the rollers in the bath and the belt. If the trains are raised to avoid this problem, there is a risk of a belt break. The result is the production of scrap and longer plant downtimes.
  • a further restriction for the maximum strip speed of a hot-dip galvanizing plant is given by the nozzle stripping system arranged above the zinc melt, cf. Fig. 1.
  • the layer thickness is adjusted with air or nitrogen, whereby the minimum coating thickness that can be represented increases with increasing belt speed. This means that thin runs cannot be produced at high belt speeds. But especially thin runs ( ⁇ 25 g / m 2 , one-sided with hot-dip galvanized sheet) are required for certain demanding applications.
  • So-called vertical hot-dip galvanizing is known as a further developed process for hot-dip coating of ferritic steel strip made of soft, unalloyed steels and is described in various patents such as EP 0 630 421 B1 and EP 0 630 420 B1 and EP 0 673 444 B1.
  • process 2 the strip runs through a working vessel filled with molten metal made of zinc and / or Al alloys from bottom to top, the strip having previously undergone a temperature treatment and the strip entering the melt underneath Air is closed.
  • the smelting volume is significantly lower compared to process 1 with approx. 2-5 t liquid zinc.
  • the above-mentioned qualitative problems do not exist either, since the alloying measures are carried out in a reservoir located next to the line and the strip quality is generated separately in the working vessel.
  • the connection between the working vessel and the furnace chamber underneath is made through a gas-tight ceramic channel, which is approx. 800 high and a passage width of only max. Has 20 mm.
  • the method 2 is characterized in that, at least in the coating area up to the weld pool, significantly higher belt speeds in the range of 300 m / min can be produced without problems even with thin steel belt, since there are no rollers in the coating vessel.
  • the coating unit with a temperature, for example, of hot-dip galvanizing from approx. 460 ° C from bottom to top, comparable to method 1, just above the melting bath, the desired thickness of the metallic finishing layer is set using the nozzle stripping method. This is done in a similar way to the process by inflating compressed air or nitrogen.
  • the nozzle wiping process comparable to process 1, a in process 2, limits the maximum possible Ba speed in the case of thin coatings.
  • the method 2 offers greater degrees of freedom, the galvanizing parameters temperature, viscosity of the melt and alloy composition, which also affect the layer thickness. For this reason, it can be expected that the belt speed in process 2 of the same layer thickness can be chosen to be higher than in process 1.
  • method 2 is n on an industrial scale not been tested. So far, only trials with pilot plants with narrow belts have been carried out. These were successful.
  • Cooling usually takes place with the aid of several air cooling sections arranged one behind the other.
  • the cooling effect and more precisely the cooling rate is limited due to the medium and cannot be increased arbitrarily over a defined distance (e.g. 2 x 15 m) using the cooling medium air.
  • a defined distance e.g. 2 x 15 m
  • the cooling sections With increasing belt speed or with increasing mass throughput, the cooling sections have to be extended. However, this entails the increase in the upper deflection roller in the cooling tower of a hot-dip coating plant.
  • the height of the upper pulley is usually between 30-60 m.
  • the cooling sections would have to be correspondingly extended further at high belt speeds, and the cooling tower height could possibly be increased in the direction of 80-90 m. This entails higher investment costs for buildings and foundations.
  • the object of the present invention is to avoid the above-mentioned disadvantages of methods 1 and 2 and to create a high-speed hot-dip coating plant without a cooling tower, which combines the least possible construction effort with optimized investment costs and high plant performance with the best production quality.
  • Figure 1 shows a conventional coating process for strips
  • Figure 2 shows a further developed coating process according to the state of the art
  • Figure 3 shows the coating method according to the invention and a correspondingly designed high-speed hot-dip coating plant in operation
  • FIG 4 shows the system according to Figure 3 in the start-up situations
  • Figure 5 shows the system according to Figure 3 at a standstill after operation
  • volume 1 runs vertically downwards into a container in which the melt pool is located after being deflected in the furnace with the exclusion of air. This weld pool is sealed at the bottom. Forces are required, which are not electromagnetic, but are generated with the help of rotating permanent magnets. Sealing the melt with permanent magnets is known per se. But rectangular channels were used there. This channel shape cannot be changed in distance and shape.
  • the present invention proposes two adjacent rotors 5, 5 '.
  • the rotors are tubes 6, 6 'made of temperature and melt resistant materials, preferably ceramic.
  • the diameter of which can be freely selected, rollers rotate, on the lateral surface of which permanent magnets 4 are arranged.
  • the rotors 5, 5 ' can be turned to melt or to the band. It is also possible to close gap 7 when the system is at a standstill or when starting up the system.
  • Permanent magnets are considerably less expensive than electromagnetic sealing by means of coils or indectors, and much less energy is required for rotation than for electromagnetic sealing, which is particularly advantageous in the event of a power failure.
  • the tape 1 can be clamped much shorter than in the previously known methods 1 and 2, since the tape 1 can be immediately cooled and deflected in a water bath 9 directly below the sealing unit.
  • the guy length in the present invention is preferably only about 5000 mm, in process 1 this is approx. 8-10 times higher and in process 2 even higher.
  • a further advantage of the method according to the invention is that the surface of the molten metal, preferably the zinc melt, is in the coating area within a protective gas atmosphere, preferably consisting of a nitrogen / hydrogen mixture, and there can be no disruptive oxidation of the liquid zinc.
  • a protective gas atmosphere preferably consisting of a nitrogen / hydrogen mixture
  • the plant for hot-dip coating a non-ferrous metal strip or a steel strip 1 is in the state of ongoing operation.
  • the incoming and to be finished band 1 passes through a tensioning roller 17 in the furnace 2 and then through the lock 18, which the inside of the dip finishing the prevailing protective gas atmosphere hermetically seals off from the atmosphere of the environment.
  • the strip 1 is deflected into the vertical against the coating section 19 via guide rollers 13.
  • the strip 1 runs vertically from top to bottom through the bath of melt 3 maintained in the gap 7 between the rotors 5, 5 'and thus receives the desired coating.
  • This melt pool 3 is prevented in a gap formed between spaced rotors 5, 5 ', at the lower end, from moving downwards with the aid of magnetic forces from magnetic fields or traveling magnetic fields of the rotating permanent magnets 4.
  • the rotors 5, 5 ' are located within the pipes 6, 6' surrounding them in the coating section 19 which is surrounded on the outside by a channel-shaped housing and which accommodates the rotors 5, 5 in a variable manner. They are surrounded by the tubes 6, 6 'made of temperature and melt-resistant, in particular non-magnetic material, preferably ceramic.
  • the permanent magnets 4 rotate within these tubes 6, 6 ′.
  • the melt required for coating and to be continuously supplemented is conveyed from a supply container 8, in which it is conditioned, by means of a quantity-controlled metal pump 12 into the gap 7 between the rotors 5, 5 '.
  • the band 1 coated therein passes through the gap 7 at the lower end and then through a device 15 for air stabilization and then a device 16 for water cooling.

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 With Molten Metal (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

La présente invention concerne un procédé et un dispositif destinés au revêtement de la surface de matériaux notamment en forme de feuillard, par exemple d'un feuillard métallique non ferreux ou d'un feuillard en acier comprenant au moins un revêtement métallique, en passant par au moins un réservoir contenant le matériau de revêtement en fusion. Le feuillard métallique à revêtir passe par le bain de fusion de matériau de revêtement contenu dans le réservoir du haut vers le bas. A cet effet sont utilisés des éléments de guidage appropriés. La fermeture du réservoir dans sa partie inférieure s'effectue au moyen d'aimants permanents circonférentiels.
EP02800118A 2001-09-28 2002-09-25 Procede de finissage par immersion a chaud Expired - Lifetime EP1430162B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10148158 2001-09-28
DE10148158A DE10148158A1 (de) 2001-09-28 2001-09-28 Verfahren zur Schmelztauchveredelung mit umgekehrtem Bandlauf
PCT/EP2002/010741 WO2003029507A1 (fr) 2001-09-28 2002-09-25 Procede de finissage par immersion a chaud

Publications (2)

Publication Number Publication Date
EP1430162A1 true EP1430162A1 (fr) 2004-06-23
EP1430162B1 EP1430162B1 (fr) 2006-05-24

Family

ID=7700812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02800118A Expired - Lifetime EP1430162B1 (fr) 2001-09-28 2002-09-25 Procede de finissage par immersion a chaud

Country Status (18)

Country Link
US (1) US20050048216A1 (fr)
EP (1) EP1430162B1 (fr)
JP (1) JP2005504177A (fr)
KR (1) KR20040045011A (fr)
CN (1) CN1295373C (fr)
AT (1) ATE327352T1 (fr)
BR (1) BR0212938A (fr)
CA (1) CA2461912A1 (fr)
DE (2) DE10148158A1 (fr)
ES (1) ES2264738T3 (fr)
HU (1) HUP0401759A2 (fr)
MX (1) MXPA04002746A (fr)
PL (1) PL367442A1 (fr)
RU (1) RU2300577C2 (fr)
UA (1) UA78722C2 (fr)
WO (1) WO2003029507A1 (fr)
YU (1) YU25704A (fr)
ZA (1) ZA200401565B (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10240954B4 (de) * 2002-09-05 2012-05-31 Sms Siemag Aktiengesellschaft Vorrichtung zur Schmelztauchbeschichtung eines Metallstranges
WO2004024974A1 (fr) * 2002-09-13 2004-03-25 Jfe Steel Corporation Procede et dispositif de production d'une courroie metallique revetue par immersion a chaud
FR2958563A3 (fr) * 2010-04-13 2011-10-14 Fives Stein Procede et dispositif de revetement de bandes metalliques.

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2223499A (en) * 1936-08-20 1940-12-03 Crown Cork & Seal Co Method of coating metal
SE328454B (fr) * 1968-09-20 1970-09-14 Asea Ab
JPS5129981B2 (fr) * 1973-07-17 1976-08-28
JPS63286562A (ja) * 1987-05-19 1988-11-24 Hitachi Cable Ltd 溶融めっき方法
DE3718178A1 (de) * 1987-05-29 1988-12-15 Hoesch Stahl Ag Verfahren zur herstellung von metallischen fasern und vorrichtung zu dessen durchfuehrung
CA2072210A1 (fr) * 1991-06-25 1992-12-26 Toshio Sato Methode assurant le deplacement continu d'un feuillard d'acier
IN191638B (fr) * 1994-07-28 2003-12-06 Bhp Steel Jla Pty Ltd
JPH1017184A (ja) * 1996-07-01 1998-01-20 Nippon Steel Corp 鋼帯の搬送ロール
JPH1143754A (ja) * 1997-07-23 1999-02-16 Nisshin Steel Co Ltd 溶融めっき金属の流下防止機構を備えた空中ポット
JPH11172400A (ja) * 1997-12-15 1999-06-29 Hitachi Ltd 連続溶融金属めっき装置及び連続溶融金属めっき方法
CN2332733Y (zh) * 1998-07-17 1999-08-11 张玉崑 使用电磁力抹制的金属线材热镀钢丝设备
JP2000212714A (ja) * 1999-01-18 2000-08-02 Hitachi Ltd 連続溶融金属めっき装置及び連続溶融金属めっき方法
JP2000219944A (ja) * 1999-01-29 2000-08-08 Nkk Corp 溶融金属メッキ鋼帯の製造装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03029507A1 *

Also Published As

Publication number Publication date
BR0212938A (pt) 2004-10-13
ATE327352T1 (de) 2006-06-15
ZA200401565B (en) 2004-05-04
RU2300577C2 (ru) 2007-06-10
EP1430162B1 (fr) 2006-05-24
CN1295373C (zh) 2007-01-17
JP2005504177A (ja) 2005-02-10
UA78722C2 (en) 2007-04-25
CA2461912A1 (fr) 2003-04-10
DE50206923D1 (de) 2006-06-29
WO2003029507A1 (fr) 2003-04-10
KR20040045011A (ko) 2004-05-31
CN1561404A (zh) 2005-01-05
MXPA04002746A (es) 2005-09-08
RU2004113102A (ru) 2005-05-20
HUP0401759A2 (en) 2004-12-28
PL367442A1 (en) 2005-02-21
YU25704A (sh) 2006-08-17
ES2264738T3 (es) 2007-01-16
DE10148158A1 (de) 2003-04-17
US20050048216A1 (en) 2005-03-03

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