EP1430162B1 - Verfahren zur schmelztauchveredelung - Google Patents

Verfahren zur schmelztauchveredelung Download PDF

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Publication number
EP1430162B1
EP1430162B1 EP02800118A EP02800118A EP1430162B1 EP 1430162 B1 EP1430162 B1 EP 1430162B1 EP 02800118 A EP02800118 A EP 02800118A EP 02800118 A EP02800118 A EP 02800118A EP 1430162 B1 EP1430162 B1 EP 1430162B1
Authority
EP
European Patent Office
Prior art keywords
strip
rotors
melt
coating
gap
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
EP02800118A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1430162A1 (de
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/de
Application granted granted Critical
Publication of EP1430162B1 publication Critical patent/EP1430162B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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 particular band-shaped material, such as a non-ferrous metal strip or steel strip, with at least one metallic coating passing through at least one molten coating material receiving container, wherein the coating material from a storage container in a gap between two counter-rotating Introduced rotors and the tape is passed from top to bottom through the melt and between the rotors.
  • the invention also relates to a device for carrying out the method.
  • process 1 The conventional fire-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 from an annealing furnace enters the melt under exclusion of air and by means of different arrangement of non-driven rollers are deflected into the vertical and stabilized, see. Figure 1. This applies to all listed coating metals / alloys in hot dip finishing.
  • rollers and bearings of the rollers are inner half of the melt and all materials are exposed to the chemical attack of the melt.
  • the lifetime of all internals within the melt is limited.
  • a large volume of melt with a correspondingly large melting vessel is required to accommodate the roles or the entire bathing equipment.
  • 200 - 400 t of liquid zinc is usual.
  • Fast regulation of the melt in terms of temperature and alloy composition is not possible due to the large volume. Greater fluctuations and above-mentioned parameters have to be accepted and may lead to qualitative losses as alloying measures and the strip quality in the same vessel influence each other.
  • Another disadvantage is that the production speed can not be increased, in particular for thin strips ⁇ 0.5 mm to achieve an economic performance (about 180 m / min).
  • One reason for this is that there is relative movement between the rollers in the bath and the belt. If the traits are increased to avoid this problem, there is a risk of a ligament tear. The consequence is a production of scrap and longer plant shutdowns.
  • process 2 the belt passes through a working vessel filled with molten metal of zinc and / or Al alloys from bottom to top, the belt having previously undergone a temperature treatment and the inlet of the belt into the melt with exclusion of air ,
  • the melt volume is much lower compared to process 1 with about 2-5 t of liquid zinc.
  • the alloying measures are carried out in a holding vessel located next to the line and the strip quality in the working vessel is produced separately from it.
  • the connection between the working vessel and the furnace chamber below is carried out by a gas-tight ceramic channel, which is about 800 mm high and for the band a passage width of only max. 20 mm.
  • the sealing of the working vessel down and avoiding the run-down of melt in the furnace chamber takes place within this channel by means of two laterally arranged on the channel or band inductors. These inductors generate an electromagnetic traveling field that produces an upward force that prevents the melt from being blown. This inductive system works like a pump, so that the exchange of the melt in the channel is guaranteed.
  • the method 2 is characterized in that much higher belt speeds in the range of 300 m / min, even at thin steel strip should be easily displayed at least in the coating area to the molten bath, since no rollers in the coating vessel are available.
  • the Düsenabstreifclar limited comparable to the method 1, also in the method 2 in the case of thin coatings, the maximum possible tape speed.
  • the method 2 offers greater degrees of freedom for the galvanizing parameters temperature, viscosity of the melt and alloy composition, which likewise act on the layer thickness. It is therefore to be expected that the belt speed in process 2 can be selected to be higher for the same layer thickness compared to process 1.
  • the method 2 is still industrially not tested. So far only attempts have been made with pilot systems with narrow band. These were successful.
  • the cooling is usually carried out with the aid of several air cooling sections arranged one behind the other.
  • the cooling effect and more specifically the cooling rate is limited by the medium and can not be arbitrarily increased using the cooling medium air at a fixed distance (for example, 2 by 15 m).
  • the cooling sections With increasing belt speed or with increasing mass flow rate, the cooling sections must be extended. However, this entails the increase of the upper deflection roller in the cooling tower of a hot dip finishing plant.
  • the height of the upper deflection roller is usually between 30-60 m.
  • the cooling sections would have to be correspondingly further extended at high belt speeds and thus the cooling tower height possibly increased in the direction of 80-90 m. This entails higher investment costs for buildings and foundations.
  • Another problem with the electromagnetic seal according to method 2 is. that the forces acting on the liquid melt, in particular also act on the ferritic band. An undesired contact of the band with the channel by the magnetic forces of the sealing inductors is only possible by additional complex measures. Additional stabilizing coils and a complex control technology are required.
  • EP-A-85 54 50 discloses a device for coating strip-shaped material, in which a metal strip is passed through a container receiving the molten coating material. The seal downwards by means of rotating rotors.
  • the document JP-A-2000212714 as well as the document JP-A-11172400 disclose a setting of desired coating thickness on a metallic belt by means of circulating permanent magenta.
  • the present invention has for its object to avoid the above-mentioned disadvantages of the method 1 and 2 and to provide in a development of the previously described prior art, a high-speed Schmelztauchveredlungsstrom without cooling tower, which has the least possible construction effort with optimized investment costs and high system performance at best Production quality combined.
  • belt 1 runs vertically downwards into a container in which the molten bath is located.
  • This molten bath is sealed downwards.
  • forces are required, but they are not electromagnetic type, but are generated by means of rotating permanent magnets.
  • the sealing of the melt with permanent magnets is known per se. But there they worked with rectangular channels. This channel shape can not be changed in distance and shape.
  • the present invention proposes two juxtaposed rotors 5, 5 'before.
  • the rotors are tubes 6, 6 'of temperature and melt-resistant materials, preferably of ceramic.
  • These tubes 6, 6 ' whose diameter can be freely selected, rotate rollers on the lateral surface permanent magnets 4 are arranged.
  • the rotors 5, 5 ' can be made to melt or to the band. It is also possible to close the gap 7 during system downtime or when starting the system.
  • Permanent magnets are much cheaper than the electromagnetic seal by means of coils or indices, and much less energy is needed for the rotation than for an electromagnetic seal, which is particularly advantageous in the event of a power failure.
  • the band 1 can be clamped much shorter than in the previously known methods 1 and 2, since directly below the sealing unit, the band 1 can be immediately cooled and deflected in a water bath 9,
  • the guy length in the present invention is preferably only about 5000 mm, in method 1 this is about 8-10 times higher and in method 2 even higher.
  • the surface of the molten metal is preferably the molten zinc in the coating area within a protective gas preferably consisting of a nitrogen / hydrogen mixture and disturbing oxidation of the liquid zinc can not take place.
  • a protective gas preferably consisting of a nitrogen / hydrogen mixture
  • disturbing oxidation of the liquid zinc can not take place.
  • these processes require that the zinc bath surface be accessible to certain manual operations.
  • access to the molten bath surface is not required for the purpose of removing oxidic particles.
  • FIG. 3 is the plant for hot dip finishing of a non-ferrous metal strip, or a steel strip 1 in the state of a running operation.
  • the tapered and to be refined belt 1 passes through the furnace 2 a tensioning roller 17 and then the lock 18, which in the interior of the immersion treatment plant prevailing protective gas atmosphere with respect to the atmosphere of the environment with oxygen hermetically seals.
  • the belt 1 is deflected by guide rollers 13 in the vertical direction against the coating section 19.
  • the belt 1 passes through the bath of melt 3 in the vertical direction from top to bottom in the gap 7 between the rotors 5, 5 'and thus obtains the desired coating.
  • This molten pool 3 is prevented from passing downward in a gap formed between spaced rotors 5, 5 'at the lower end by means of magnetic forces of magnetic field or traveling magnetic fields of the rotating permanent magnets 4.
  • the rotors 5, 5 ' are located inside the tubes 6, 6' surrounding them in the coating section 19 which is outwardly surrounded by a channel-shaped housing and which accommodates the rotors 5, 5 in a variable spacing. They are surrounded the tubes 6, 6 'made of temperature and melt-resistant, in particular non-magnetic material, preferably ceramic. Within these tubes 6, 6 ', the permanent magnets 4 rotate.
  • the required for coating and continuously to be supplemented melt is from a reservoir 8, wherein it is conditioned by means of a metal pump 12 volume controlled in the gap 7 between the rotors 5, 5 'promoted.
  • the coated therein tape 1 passes through the gap 7 at the bottom and then a device 15 for air stabilization, and then a device 16 for water cooling. It is withdrawn after passing through the water bath 9 and a tension roller 20 for further use or treatment of the plant.

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)
EP02800118A 2001-09-28 2002-09-25 Verfahren zur schmelztauchveredelung Expired - Lifetime EP1430162B1 (de)

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 (de) 2001-09-28 2002-09-25 Verfahren zur schmelztauchveredelung

Publications (2)

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

Family

ID=7700812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02800118A Expired - Lifetime EP1430162B1 (de) 2001-09-28 2002-09-25 Verfahren zur schmelztauchveredelung

Country Status (18)

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

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
CA2479031C (en) * 2002-09-13 2008-06-03 Jfe Steel Corporation Method and apparatus for producing hot-dip plated metal strip
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 (pl) * 1968-09-20 1970-09-14 Asea Ab
JPS5129981B2 (pl) * 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 (en) * 1991-06-25 1992-12-26 Toshio Sato Method for continuously moving a steel strip
IN191638B (pl) * 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

Also Published As

Publication number Publication date
KR20040045011A (ko) 2004-05-31
HUP0401759A2 (en) 2004-12-28
WO2003029507A1 (de) 2003-04-10
ATE327352T1 (de) 2006-06-15
MXPA04002746A (es) 2005-09-08
CN1561404A (zh) 2005-01-05
RU2300577C2 (ru) 2007-06-10
ZA200401565B (en) 2004-05-04
EP1430162A1 (de) 2004-06-23
RU2004113102A (ru) 2005-05-20
ES2264738T3 (es) 2007-01-16
JP2005504177A (ja) 2005-02-10
DE50206923D1 (de) 2006-06-29
DE10148158A1 (de) 2003-04-17
CN1295373C (zh) 2007-01-17
CA2461912A1 (en) 2003-04-10
US20050048216A1 (en) 2005-03-03
BR0212938A (pt) 2004-10-13
PL367442A1 (pl) 2005-02-21
YU25704A (sh) 2006-08-17
UA78722C2 (en) 2007-04-25

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