EP0979879B1 - Procédé de galvanisation d'une bande métallique - Google Patents

Procédé de galvanisation d'une bande métallique Download PDF

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Publication number
EP0979879B1
EP0979879B1 EP99401700A EP99401700A EP0979879B1 EP 0979879 B1 EP0979879 B1 EP 0979879B1 EP 99401700 A EP99401700 A EP 99401700A EP 99401700 A EP99401700 A EP 99401700A EP 0979879 B1 EP0979879 B1 EP 0979879B1
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EP
European Patent Office
Prior art keywords
injected
hydrogen
inert gas
flow rate
annealing furnace
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
EP99401700A
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German (de)
English (en)
French (fr)
Other versions
EP0979879A1 (fr
Inventor
Serban Cantacuzene
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.)
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Air Liquide SA
LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude
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Publication date
Application filed by Air Liquide SA, LAir Liquide SA a Directoire et Conseil de Surveillance pour lEtude et lExploitation des Procedes Georges Claude filed Critical Air Liquide SA
Publication of EP0979879A1 publication Critical patent/EP0979879A1/fr
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Publication of EP0979879B1 publication Critical patent/EP0979879B1/fr
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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
    • C23C2/02—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
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • C23C2/0224—Two or more thermal pretreatments

Definitions

  • the invention relates to a method of galvanizing a part metallic (strip, sheet ...) in a continuous galvanizing line, the galvanizing line comprising, arranged in series and connected to each other others by conduits to form a circulation duct of a reducing atmosphere most often essentially composed of a gas inert such as nitrogen or argon, and hydrogen, a preheating oven, an oven annealing, a cooling station and a quenching station for said part metallic in a bath of liquid zinc or a zinc alloy, in which, before immersing the metal part in the liquid bath, it is exposed to this reducing atmosphere to remove oxides from the surface of the metal part.
  • a gas inert such as nitrogen or argon
  • a continuous galvanizing line includes at least four metal strip processing areas to galvanize: a preheating zone, an annealing zone, a cooling and a quenching zone comprising a zinc bath in which is dipped the metal strip to be galvanized.
  • the area preheating includes an oven with open flame burners serving on the one hand to rapidly reheat the metal strip to be treated at a temperature typically between 400 ° C and 700 ° C, and on the other hand subject the laminating oils present on the surface to pyrolysis the band.
  • the burners are operated in the absence of air to ensure an atmosphere non-oxidizing towards iron.
  • the different processing areas of the line galvanization are connected to each other by conduits to form a duct for circulating the reducing atmosphere.
  • the mixture of nitrogen and hydrogen is injected into a pipe also called a horn or bell one end of which is immersed in the zinc bath and the other end of which is connected to the outlet end of the cooling station, so that the reducing atmosphere circulates in the opposite direction to the direction of travel of the metal strip to be treated.
  • the flow rate of the nitrogen and hydrogen mixture and the hydrogen content of this mixture are maintained at the same level, regardless of characteristics and running speed of the metal strips at treat.
  • the flow rate of the nitrogen and hydrogen mixture and the hydrogen content of this mixture are set at a high level so as to allow treatment even the most unfavorable cases, i.e. the metal strips of large surface dimensions and / or treated at high speeds. But as we can see, this excess of quality represented by a mixture rich in hydrogen injected at a high rate entails a significant cost for this reducing atmosphere.
  • the invention aims to propose a method for optimizing the use of the reducing atmosphere in order to reduce the cost generated by this in the operation of the galvanizing line as well as better maintain the level of quality of products coming out of the line.
  • the invention relates to a galvanizing process of a metal strip in a continuous galvanizing line, the line of galvanizing comprising, arranged in series and connected to each other by conduits to form a continuous circulation sheath of a reducing atmosphere comprising an inert gas and hydrogen, a preheating, an annealing furnace, a cooling station and a soaking said metal strip in a bath of liquid zinc or a liquid zinc alloy, in which, before plunging the metal strip in the bath, it is exposed to this reducing atmosphere to eliminate oxides present on its surface, characterized in that to renew the reducing atmosphere in said sheath, the inert gas is injected therein and hydrogen by adjusting the flow of hydrogen according to the amount of metal strip surface to be treated per unit of time.
  • a reducing atmosphere comprising, arranged in series and connected to each other by conduits to form a continuous circulation sheath of a reducing atmosphere comprising an inert gas and hydrogen, a preheating, an annealing furnace, a
  • Figure 1 is shown schematically a line 1 for galvanizing a metal strip 3, for example steel.
  • the galvanizing line 1 comprises, arranged in series, an oven 5 preheating, an annealing oven 7, a cooling station 9 and a quenching station 11 comprising a bath 13 of liquid zinc or of alloy liquid.
  • the preheating oven 5 is for example equipped with burners 15 with an open flame used on the one hand to quickly heat the metal strip 3 to be treated, at a temperature typically between 400 ° C. and 700 ° C., and on the other hand to subject to a pyrolysis the rolling oils present on the surface of the strip.
  • the annealing furnace 7 is for example equipped with resistors electric or radiant tubes diagrammed in 8.
  • the cooling station 9 is used to cool the metal strip 3 at the outlet of the annealing oven 7, at a value for example close to 470 ° C.
  • the preheating oven 5, the annealing oven 7, the station 9 cooling and the station 11 quenching which each have a form of tunnel, are connected to each other by conduits 17, 19 and 21 for forming with them a continuous sheath 23 of circulation of an atmosphere reducing essentially composed of nitrogen and hydrogen.
  • conduit 21 connecting the outlet end of the station 9 of cooling at quenching station 11 is tilted down and plunges with its end 25 in the liquid bath 13.
  • This conduit 21 is often called horn or bell.
  • the galvanizing line 1 comprises according to the invention, on the one hand, an injector 30 of an inert gas, for example nitrogen, arranged in the wall of the tube 21 at a first location 30A located at near the end 25 of the tube immersed in the liquid bath 13, at above it, and on the other hand, a hydrogen injector 31 (or a mixture of hydrogen and an inert gas) arranged in the wall of the proboscis 21 at a second location 31A located near the end 33 thereof which is connected to the cooling station 9.
  • an injector 30 of an inert gas for example nitrogen
  • a hydrogen injector 31 or a mixture of hydrogen and an inert gas
  • the injector 30 is connected to a supply conduit 32 in which is arranged a member 34 regulating flow and the injector 31 is connected to a supply conduit 36 in which is arranged a flow regulating member 38.
  • line 1 includes means 40 for determining and for adjusting the running speed of the metal strip 3.
  • a gas sample point 42 inside the oven annealing used to return atmospheric samples for analysis, for example as shown in the figure to an analyzer 47 of the hydrogen content of the sample, and to an analyzer 46 of the water vapor content of the sample.
  • the means 40 as well as the analyzers 46 and 47, are connected to a data processing unit 50 (for example an automaton programmable), unit in turn able to control the operation of two flow regulators 34 and 38.
  • a data processing unit 50 for example an automaton programmable
  • the metal strip 3 guided by rollers 27 pass successively into the preheating oven 5 to be brought to a temperature here between 400 ° C and 700 ° C, then in the oven 7 annealing to ensure its metallurgical characteristics, in station 9 cooling to be brought to a temperature close to 470 ° C and finally in the quenching station 11 so as to be covered with zinc.
  • the unit 50 falls as described above, the running speed of the metal strip 3, the dew point and the hydrogen content of the atmosphere in at least one point (42) of the furnace 7 of annealing and controlling the flow rates via regulators 34 and 38 nitrogen and / or hydrogen injected into the tube 21, in accordance with one of the embodiments of the invention described above in the present description.
  • Unit 50 regulates these nitrogen and hydrogen flow rates as a function of the amount of surface of the metal strip to be treated per unit of time.
  • the speed is taken into account of running of the strip in the line supplied by the means 40, and the strip width 3.
  • the assembly making it possible to keep the hydrogen flow rate constant at S / t constant, at a value close to 0.009 m 3 of hydrogen per m 2 of strip.
  • Figure 2 therefore illustrates an example of abacuses that it is possible to carry out on a given line, for one or more steels treated, in adopting a medium gas setting, and sweeping a typical range of variation of the surface treated per unit of time (which takes into account the range of line speed usually practiced, and the range of widths of products treated on the line considered), reading these charts for determining changes in settings gas supply which it is advantageous to adopt in each case.
  • one realizes hydrogen zoning of the cooling zone by injecting, in addition nitrogen in the sheath 23 at the first location 30A at a substantially constant flow, and the hydrogen at location 31A, nitrogen in the annealing oven 7, preferably in the last portion of exit from it. And in this case, we can adjust the nitrogen flow injected into the annealing furnace 7 as a function of a set point value dew at this oven.
  • This provision allows on the one hand to locally raise the hydrogen concentration at cooling station 9, thus protecting the surface of the strip against oxidation before being immersed in the zinc bath 13, and on the other hand to contribute to the belt cooling 3.
  • the process of the invention not only reduces consumption of hydrogen and thus the operating cost to regenerate the atmosphere reductive but on the other hand to get more surely and under conditions that are not the simple implementation of an excess of quality consistency of the characteristics of the products released by the galvanizing line.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Coating With Molten Metal (AREA)
  • Electroplating Methods And Accessories (AREA)
EP99401700A 1998-08-13 1999-07-07 Procédé de galvanisation d'une bande métallique Expired - Lifetime EP0979879B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9810392 1998-08-13
FR9810392A FR2782326B1 (fr) 1998-08-13 1998-08-13 Procede de galvanisation d'une bande metallique

Publications (2)

Publication Number Publication Date
EP0979879A1 EP0979879A1 (fr) 2000-02-16
EP0979879B1 true EP0979879B1 (fr) 2003-11-12

Family

ID=9529665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99401700A Expired - Lifetime EP0979879B1 (fr) 1998-08-13 1999-07-07 Procédé de galvanisation d'une bande métallique

Country Status (9)

Country Link
US (1) US6224692B1 (es)
EP (1) EP0979879B1 (es)
JP (1) JP2000064006A (es)
AR (1) AR020168A1 (es)
AT (1) ATE254190T1 (es)
CA (1) CA2280405A1 (es)
DE (1) DE69912698T2 (es)
ES (1) ES2211006T3 (es)
FR (1) FR2782326B1 (es)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1225244A1 (fr) * 2001-01-17 2002-07-24 Recherche Et Developpement Du Groupe Cockerill Sambre Procédé de galvanisation de l'acier
BE1014997A3 (fr) * 2001-03-28 2004-08-03 Ct Rech Metallurgiques Asbl Procede de recuit en continu de bandes en acier en vue de leur galvanisation au trempe et four pour sa mise en oeuvre.
FR2833018B1 (fr) * 2001-11-30 2004-02-13 Air Liquide Methode de conduite et de controle de procedes de traitement thermique de produits dans des fours continus
ES2297143T3 (es) * 2002-06-28 2008-05-01 Sms Demag Aktiengesellschaft Ampliacion de gas de separacion durante el acabado en continuo por inmersion en fusion.
BE1015109A3 (fr) * 2002-09-13 2004-10-05 Drever Internat S A Procede de traitemant thermique de bande metallique.
FR2859469B1 (fr) * 2003-09-09 2006-01-06 Air Liquide Procede de controle du formage de verre plat
US20050281953A1 (en) * 2004-06-21 2005-12-22 Carroll Kevin R Coating apparatus and method
DE102005033288A1 (de) * 2005-07-01 2007-01-04 Sms Demag Ag Verfahren und Vorrichtung zur Schmelztauchbeschichtung eines Metallbandes
AT505289B1 (de) * 2007-07-18 2008-12-15 Ebner Instrieofenbau Ges M B H Verfahren zur wärmebehandlung eines metallbandes
JP5071551B2 (ja) * 2010-12-17 2012-11-14 Ｊｆｅスチール株式会社 鋼帯の連続焼鈍方法、溶融亜鉛めっき方法
US9212414B2 (en) 2011-05-27 2015-12-15 Ak Steel Properties, Inc. Meniscus coating apparatus and method
DE102011053634B3 (de) 2011-09-15 2013-03-21 Benteler Automobiltechnik Gmbh Verfahren sowie Vorrichtung zur Erwärmung einer vorbeschichteten Platine aus Stahl
EP2835432B1 (en) * 2012-04-06 2016-11-02 JFE Steel Corporation Continuous hot-dip zinc plating facility
IN2015DN03981A (es) * 2012-12-04 2015-10-02 Jfe Steel Corp
KR101611664B1 (ko) * 2013-10-30 2016-04-12 주식회사 포스코 도금표면 품질 및 도금밀착성이 향상된 아연도금강판 및 그 제조방법
JP6418175B2 (ja) * 2016-02-15 2018-11-07 Ｊｆｅスチール株式会社 露点制御方法および溶融亜鉛めっき鋼板の製造方法

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Publication number Priority date Publication date Assignee Title
US4053663A (en) * 1972-08-09 1977-10-11 Bethlehem Steel Corporation Method of treating ferrous strand for coating with aluminum-zinc alloys
JPS5235722A (en) * 1975-09-16 1977-03-18 Nippon Steel Corp One side molten metal plating method
US4123292A (en) * 1976-12-23 1978-10-31 Armco Steel Corporation Method of treating steel strip and sheet surfaces for metallic coating
AU543013B2 (en) * 1980-08-19 1985-03-28 Lysaght, J. (Australia) Ltd. Hot-dip coating of ferrous strands
US4557953A (en) * 1984-07-30 1985-12-10 Armco Inc. Process for controlling snout zinc vapor in a hot dip zinc based coating on a ferrous base metal strip
JP2530939B2 (ja) * 1990-11-30 1996-09-04 新日本製鐵株式会社 高Ｓｉ含有高張力溶融亜鉛めっき鋼板の製造方法
JP3014536B2 (ja) * 1992-05-01 2000-02-28 新日本製鐵株式会社 高強度合金化溶融亜鉛めっき鋼板の製造方法

Also Published As

Publication number Publication date
EP0979879A1 (fr) 2000-02-16
FR2782326A1 (fr) 2000-02-18
DE69912698T2 (de) 2004-09-23
US6224692B1 (en) 2001-05-01
DE69912698D1 (de) 2003-12-18
JP2000064006A (ja) 2000-02-29
FR2782326B1 (fr) 2000-09-15
ES2211006T3 (es) 2004-07-01
CA2280405A1 (fr) 2000-02-13
ATE254190T1 (de) 2003-11-15
AR020168A1 (es) 2002-04-10

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