EP1203106A2 - Procede et dispositif de galvanisation a chaud de feuillard d'acier lamine a chaud - Google Patents

Procede et dispositif de galvanisation a chaud de feuillard d'acier lamine a chaud

Info

Publication number
EP1203106A2
EP1203106A2 EP00958379A EP00958379A EP1203106A2 EP 1203106 A2 EP1203106 A2 EP 1203106A2 EP 00958379 A EP00958379 A EP 00958379A EP 00958379 A EP00958379 A EP 00958379A EP 1203106 A2 EP1203106 A2 EP 1203106A2
Authority
EP
European Patent Office
Prior art keywords
strip
station
hot
rinsing
galvanizing
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
EP00958379A
Other languages
German (de)
English (en)
Other versions
EP1203106B1 (fr
Inventor
Markus Reifferscheid
Rolf Brisberger
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
Priority claimed from DE19943238A external-priority patent/DE19943238A1/de
Application filed by SMS Demag AG filed Critical SMS Demag AG
Publication of EP1203106A2 publication Critical patent/EP1203106A2/fr
Application granted granted Critical
Publication of EP1203106B1 publication Critical patent/EP1203106B1/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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/19—Iron or steel
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G3/00—Apparatus for cleaning or pickling metallic material
    • C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
    • C23G3/027—Associated apparatus, e.g. for pretreating or after-treating
    • C23G3/029—Associated apparatus, e.g. for pretreating or after-treating for removing the pickling fluid from the objects

Definitions

  • the invention relates to a method and a system for hot-dip galvanizing hot-rolled steel strip, the strip being introduced into a pickling station in a first process step and a scale layer and reaction products being removed therein from the strip surface.
  • the strip is introduced into a rinsing station and the strip surface is rinsed free of residues of the pickling and pickling products, and then introduced into a drying station and dried therein.
  • the strip is introduced into a furnace in a further process step and set therein to the galvanizing temperature under a protective gas atmosphere, and in a last process step is passed through a galvanizing bath and the surface of the strip is coated with a hot-dip galvanizing layer.
  • the hot-dip coating in particular the hot-dip galvanizing of hot-rolled steel strip, so-called hot strip, is becoming more and more important economically compared to conventional cold-rolled strip coating.
  • hot strip Through the development of thin slab technology in hot strip, there is the technical possibility of producing hot strips in the thickness range below 1.2 mm from the casting heat. There is also the possibility, depending on customer requirements, to replace cold strip with comparatively cheaper hot strip.
  • hot-dip coating in particular hot-dip galvanizing of steel strips. These are predominantly plant types in which cold-rolled strips are used.
  • the actual coating process is preceded by an annealing furnace, in which a structural transformation takes place at high temperatures in order to achieve the desired mechanical properties.
  • the temperature difference between the molten bath, preferably zinc or zinc alloys, and the maximum strip temperature can be up to 400 ° C. With this strip overheating, however, a fire coating cannot be carried out, which is why the strip must be cooled to temperatures close to the melting bath temperature before the coating.
  • Hot strip or pre-annealed cold strip do not require annealing in order to influence the mechanical properties, rather the strip temperature is only adapted to that of the melting bath in order to achieve the desired reaction of the steel strip surface with the alloy components of the melting bath. In contrast, high-temperature annealing is often even disadvantageous for the mechanical properties of the strip.
  • the present invention relates, by way of example only, to the process variants for hot strip hot finishing or hot strip hot galvanizing.
  • the desired temperature level, especially in hot strip hot-dip galvanizing, is still higher than the required 450 ° C of the zinc bath in previously operated systems for hot-dip coating.
  • the reason for this is the need to remove all oxidation products and their precursors from the steel strip surface. Oxidation products inevitably arise in the transition area from the pickling stage through the rinsing and drying stage to the entrance to the furnace due to the action of atmospheric oxygen.
  • the quantity and formation of the oxidation products entering the furnace and the atmospheric oxygen carried in by the belt determine the necessary process parameters of the treatment procedure, characterized by a required reduction potential, temperature level and holding time. In many cases, the temperature level used is so high that the strip must be additionally cooled before it enters the zinc bath.
  • Another way of working is characterized by a significant increase in the temperature level in the zinc bath to values above 460 ° C.
  • the increased amount of zinc-containing slag is particularly disadvantageous in this process. This leads on the one hand to increased material and operating costs for the zinc bath, and on the other hand to a loss of quality on the assembly line.
  • the invention has for its object to provide a method and a hot strip galvanizing plant which overcomes the aforementioned disadvantages and difficulties and delivers hot-dip galvanized steel strip of high and flawless surface quality with an economical outlay on material and operating costs.
  • the strip temperature in the furnace is set to a maximum of 50 ° K above the immersion temperature in the zinc bath.
  • the H 2 concentration in the furnace is advantageously increased to max. 20% preferably set to less than 5%. It is expedient that the process steps between the last rinsing stage of the rinsing station and the drying station up to the inlet of the temperature control oven are carried out with hermetic shielding of atmospheric oxygen from the environment.
  • a corresponding system for carrying out the method according to the invention accordingly provides that the outlet of the last rinsing stage of the rinsing station is connected to the inlet of the dryer and its outlet to the inlet of the oven by means of locks and is hermetically sealed from the surrounding atmosphere.
  • the method and the system according to the invention ensure that the optimum surface condition of the strip, which is achieved after the strip has passed through the pickling station and rinsing station, is preserved in the subsequent drying stage and during the transition in the furnace areas and from this into the galvanizing bath. This is achieved through:
  • a water-binding medium preferably NH 3 , or a solution thereof, to the belt in the rinsing stage, after which the water-binding medium can be removed from the belt quickly and without residues in the subsequent drying stage, that is to say without oxygen or liquid cleaning medium being introduced,
  • the above-mentioned measures preserve the optimal strip condition after pickling into the oven and achieve the optimum strip temperature setting when immersed in the zinc bath.
  • the access of oxygen and the associated surface reactions, especially oxidation, are prevented.
  • This enables furnace operation at temperatures in the range of the melt bath temperature. Overheating of the belt and an extension of the holding time in the oven are not necessary. A belt cooler becomes superfluous.
  • the procedure according to the invention and the corresponding system allow a much more compact design of the furnace element and lower investments. Station and operating costs. At the same time, furnace operation with lower H 2 contents in the protective gas is possible.
  • the disadvantages in the aforementioned conventional method with an increased zinc bath temperature are advantageously avoided.
  • the strip is set to a temperature which is at most 50 ° K higher than the immersion temperature in the zinc bath.
  • Figure 2 shows a layout of a hot dip galvanizing plant according to the invention.
  • a strip 50 is introduced into a pickling station 10 with three pickling stages 11 to 13 in a first process step and a scale layer and reaction products are removed from the strip surface.
  • the pickling is usually carried out in the pickling station 10 or in the pickling stages 11, 12, 13 using hydrochloric acid (HCL).
  • HCL hydrochloric acid
  • the strip 50 is introduced into the rinsing station 20 with the rinsing stages 21 to 23 and the strip surface is freed of residues of the pickling and the pickling products.
  • the tape is then introduced into the drying station 30 and dried therein.
  • the strip 50 is introduced in a further process step into an oven 40, comprising a preheating stage 41 and an integrated temperature control stage 42, and is preferably heated therein to the galvanizing temperature in a protective gas atmosphere, and in a last process step through a galvanizing bath. leads.
  • the surface of the strip 50 is coated with a hot-dip galvanizing layer.
  • the process steps between the last rinsing stage 23 of the rinsing station 20 via the drying station 30 and the inlet 43 of the tempering furnace 40 are carried out with hermetic shielding of atmospheric oxygen from the environment.
  • a water-repellent or binding medium 25 is introduced into the rinsing stage 23.
  • NH 3 or a solution of NH 3 can be used as the medium.
  • a preferred embodiment of the method provides that the belt 50 is rinsed in the rinsing station 20 in the first stages 21, 22 with deionized water and in the third stage 23 with or with the addition of NH 3 as the drying medium.
  • the belt 50 is dried in the drying station 30 without air being supplied. According to the invention, drying is carried out by means of heat radiation with the addition of a mixture of nitrogen, hydrogen and ammonia gas (N 2 / NH 3 ) or H 2 .
  • the drying station 30 is hermetically sealed on both sides with locks 70, 80 following the neighboring stations 20 and 40 against the entry of atmospheric oxygen, the outlet of the last rinsing stage 23 of the rinsing station 20 with the inlet of the drying station 30 and its outlet with the inlet 43 of the Tempering furnace 40 are connected to one another by locks 70, 80 and are hermetically sealed from the surrounding atmosphere.
  • the measures according to the invention maintain the optimum strip state after pickling into the tempering furnace because the introduction of atmospheric oxygen is prevented.
  • its design can be simplified due to the lower heating output required and the cooling section eliminated and can be realized with more favorable investment and operating costs. Oven operation is also possible with comparatively low H 2 contents in the protective gas.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Coating With Molten Metal (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de galvanisation à chaud de feuillard d'acier laminé à chaud. Dans une première étape du procédé, le feuillard destiné à la galvanisation (50) est introduit dans une station de décapage (10) dans laquelle la couche de calamine et les produits réactionnels sont éliminés de la surface du feuillard. Dans une étape ultérieure du procédé, le feuillard (50) est introduit dans une station de rinçage (20) dans laquelle les résidus de calamine et de produits de calamine sont éliminés de la surface du feuillard. Pour finir, le feuillard (50) est introduit dans une station de séchage (30) puis séché. A partir de ce moment, le feuillard (50) est introduit, durant une étape suivante du procédé, dans un four (40) dans lequel il est chauffé sous atmosphère de gaz de protection à une température de galvanisation, puis, durant une dernière étape du procédé, le feuillard passe par un bain de galvanisation grâce auquel il se trouve recouvert d'une couche de galvanisation à chaud. Le procédé est amélioré par le chauffage du feuillard (50) dans le four (40) à une température qui ne dépasse pas de plus de 50 DEG K la température d'immersion dans le bain de galvanisation.
EP00958379A 1999-08-06 2000-08-04 Procede et dispositif de galvanisation a chaud de feuillard d'acier lamine a chaud Expired - Lifetime EP1203106B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19937216 1999-08-06
DE19937216 1999-08-06
DE19943238 1999-09-10
DE19943238A DE19943238A1 (de) 1999-08-06 1999-09-10 Verfahren und Anlage zum Feuerverzinken von warmgewalztem Stahlband
PCT/EP2000/007582 WO2001011099A2 (fr) 1999-08-06 2000-08-04 Procede et dispositif de galvanisation a chaud de feuillard d'acier lamine a chaud

Publications (2)

Publication Number Publication Date
EP1203106A2 true EP1203106A2 (fr) 2002-05-08
EP1203106B1 EP1203106B1 (fr) 2004-03-17

Family

ID=26054519

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00958379A Expired - Lifetime EP1203106B1 (fr) 1999-08-06 2000-08-04 Procede et dispositif de galvanisation a chaud de feuillard d'acier lamine a chaud

Country Status (14)

Country Link
US (1) US6761936B1 (fr)
EP (1) EP1203106B1 (fr)
JP (1) JP2003506573A (fr)
CN (1) CN1201029C (fr)
AT (1) ATE262049T1 (fr)
AU (1) AU777644B2 (fr)
BR (1) BR0012961A (fr)
CA (1) CA2381247C (fr)
EG (1) EG22474A (fr)
ES (1) ES2216948T3 (fr)
MX (1) MXPA02001283A (fr)
TR (1) TR200200323T2 (fr)
TW (1) TW500827B (fr)
WO (1) WO2001011099A2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1538233A1 (fr) * 2002-09-13 2005-06-08 JFE Steel Corporation Procede et dispositif de production d'une courroie metallique revetue par immersion a chaud
DE102005013103A1 (de) 2005-03-18 2006-09-28 Sms Demag Ag Kontrollierte Dickenreduktion bei schmelztauchbeschichtetem warmgewalztem Stahlband und hierbei eingesetzte Anlage
DE102008005605A1 (de) * 2008-01-22 2009-07-23 Thyssenkrupp Steel Ag Verfahren zum Beschichten eines 6 - 30 Gew. % Mn enthaltenden warm- oder kaltgewalzten Stahlflachprodukts mit einer metallischen Schutzschicht
CN103060829B (zh) * 2013-01-31 2015-03-11 汕尾市栢林电子封装材料有限公司 一种去除金属带表面氧化物的设备
TWI480422B (zh) * 2013-10-07 2015-04-11 China Steel Corp A device and method for cleaning the mouth of a zinc tank
EP2927343A1 (fr) 2014-03-31 2015-10-07 Primetals Technologies Austria GmbH Installation et procédé de décapage et de revêtement métallique d'une bande métallique
CN108265252B (zh) * 2018-01-19 2020-10-09 河北工业大学 一种环保热镀方法
CN108823584A (zh) * 2018-07-09 2018-11-16 宁波甬凌新材料科技有限公司 一种用于金属板热镀锌的酸洗烘干前处理装置

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Publication number Priority date Publication date Assignee Title
LU77032A1 (fr) * 1976-04-01 1977-07-22
BE890256A (fr) * 1981-09-07 1982-03-08 Centre Rech Metallurgique Perfectionnements aux procedes de galvanisation des toles ou bandes en acier
JPS6179755A (ja) * 1984-09-28 1986-04-23 Nisshin Steel Co Ltd 溶融めつき真空蒸着めつき兼用の連続めつき装置
US4814210A (en) * 1984-11-09 1989-03-21 Werner Ackermann Process and means for hot-dip galvanizing finned tubes
US5284680A (en) * 1992-04-27 1994-02-08 Inland Steel Company Method for producing a galvanized ultra-high strength steel strip
WO1995000675A1 (fr) * 1993-06-25 1995-01-05 Kawasaki Steel Corporation Procede de zingage a chaud par trempe d'une tole grosse d'acier a resistance elevee reduite dans les parties non revetues
DE4433946A1 (de) * 1994-09-23 1996-03-28 Henkel Kgaa Phosphatierverfahren ohne Nachspülung
DE69723782T2 (de) * 1996-02-22 2004-04-15 Sumitomo Metal Industries, Ltd. Geglühtes stahlblech und verfahren zu dessen herstellung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0111099A2 *

Also Published As

Publication number Publication date
MXPA02001283A (es) 2002-08-12
CA2381247A1 (fr) 2001-02-15
WO2001011099A3 (fr) 2001-09-07
AU6992300A (en) 2001-03-05
CN1420942A (zh) 2003-05-28
WO2001011099A2 (fr) 2001-02-15
CN1201029C (zh) 2005-05-11
CA2381247C (fr) 2009-02-03
AU777644B2 (en) 2004-10-28
TW500827B (en) 2002-09-01
TR200200323T2 (tr) 2002-06-21
ATE262049T1 (de) 2004-04-15
ES2216948T3 (es) 2004-11-01
EG22474A (en) 2003-02-26
US6761936B1 (en) 2004-07-13
BR0012961A (pt) 2002-04-30
EP1203106B1 (fr) 2004-03-17
JP2003506573A (ja) 2003-02-18

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