EP1819840B1 - Procede de galvanisation a chaud d'une bande d'acier de resistance superieure - Google Patents

Procede de galvanisation a chaud d'une bande d'acier de resistance superieure Download PDF

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Publication number
EP1819840B1
EP1819840B1 EP05812469A EP05812469A EP1819840B1 EP 1819840 B1 EP1819840 B1 EP 1819840B1 EP 05812469 A EP05812469 A EP 05812469A EP 05812469 A EP05812469 A EP 05812469A EP 1819840 B1 EP1819840 B1 EP 1819840B1
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EP
European Patent Office
Prior art keywords
strip
atmosphere
heat treatment
oxide layer
continuous furnace
Prior art date
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EP05812469A
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German (de)
English (en)
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EP1819840A1 (fr
Inventor
Ronny Leuschner
Manfred Meurer
Wilhelm Warnecke
Sabine Zeizinger
Gernot Nothacker
Michael Ullmann
Norbert Schaffrath
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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Priority to PL05812469T priority Critical patent/PL1819840T3/pl
Publication of EP1819840A1 publication Critical patent/EP1819840A1/fr
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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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • 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
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • 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
    • C23C2/0222—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
    • C23C2/02—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
    • 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
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • hot-rolled or cold-rolled, surface-treated steel sheets are used.
  • the demands placed on such sheets are many. They should on the one hand be well deformable and on the other hand have a high strength.
  • the high strength is achieved by adding certain alloying constituents, such as Mn, Si, Al and Cr, to the iron.
  • alloying constituents such as Mn, Si, Al and Cr
  • the solution to this problem consists in the method specified in claim 1.
  • the method according to the invention is in the max. 250 s first step prevents the heating of significant alloying constituents diffuse to the surface of the strip. It would be optimal if diffusion of alloy components to the surface of the strip could be completely prevented, which is hardly possible for practical reasons. What matters is that the diffusion of alloying constituents to the surface is suppressed to such an extent that, in the following step, an effective iron oxide layer can be formed which prevents further alloying constituents from diffusing to the surface at the elevated annealing temperature.
  • a pure iron layer can be formed during the longer than 50 s annealing treatment, which is very well suited for a full-surface and firmly adhering coating of zinc and / or aluminum.
  • the result is optimal if the iron oxide layer produced in the oxidizing atmosphere is completely reduced to pure iron, because then the coating is also optimized with respect to its deformation and strength properties.
  • the thickness of the forming oxide layer is measured and adjusted depending on this thickness and dependent on the passage speed of the belt treatment time of the O 2 content such that the Oxide layer can then be completely reduced.
  • the change in the throughput speed of the belt for example as a result of disturbances can be considered in this way without detriment to the surface quality of the hot dip coated strip.
  • the high-strength steel should contain at least one of the following constituents: Mn> 0.5%, Al> 0.2%, Si> 0.1%, Cr> 0.3%. Other components such as Mo, Ni, V, Ti, Nb and P can be added.
  • An essential feature of the invention is that the heat treatment of the strip in the reducing atmosphere takes much longer in both the warm-up and the subsequent annealing as compared to the heat treatment in the oxidizing atmosphere.
  • the volume of the oxidizing atmosphere is very small compared to the remaining volume of the reducing atmosphere.
  • This has the advantage that it is possible to react quickly to changes in the treatment process, in particular the throughput speed and the formation of the oxidation layer.
  • the heat treatment of the strip takes place in the reducing atmosphere in a continuous furnace with an integrated chamber with the oxidizing atmosphere, wherein the volume of the chamber to the remaining volume of the continuous furnace is many times smaller.
  • the cleaned belt 1 then passes into a continuous furnace 5. From the continuous furnace 5, the belt 1 passes through a locked to the atmosphere lock 6 in a hot dip 7 with zinc. From there it passes via a cooling section 8 or a device for heat treatment to a winding station 9 in the form of a coil.
  • the band 1 in reality does not run in a straight line through the continuous furnace 5, but meandering, in order to achieve sufficiently long treatment times at practical length of the continuous furnace 5 can.
  • the continuous furnace 5 is divided into three zones 5a, 5b, 5c.
  • the middle zone 5b forms a reaction chamber and is atmospherically closed with respect to the first and last zones 5a, 5c.
  • Their length is only about 1/100 of the total length of the continuous furnace 5. For better illustration, the drawing is not to scale extent. According to the different lengths of the zones and the treatment times of the continuous belt 1 in the individual zones 5a, 5b, 5c are different.
  • the first zone 5a there is a reducing atmosphere.
  • a typical composition of this atmosphere consists of 2% to 8% H 2 and balance N 2 .
  • the strip is heated to 650 to 750 ° C. At this temperature, the stated alloying constituents diffuse only in small amounts to the surface of the strip 1.
  • the temperature of the first zone 5a is essentially kept only.
  • Their atmosphere is oxygenated.
  • the O 2 content is between 0.01% to 1%. He can be hired. It depends on how long the treatment time is. If the treatment time is short, the O 2 content is high, while it is low with long treatment time.
  • an iron oxide layer is formed on the surface of the belt. The thickness of this iron oxide layer can be measured by optical means. Depending on the measured thickness and the flow rate of the O 2 content the atmosphere set. Since the central zone 5b is very short in comparison to the entire furnace length, the chamber volume is correspondingly small. Therefore, the reaction time for a change in the composition of the atmosphere is small.
  • a further heating up to about 900 ° C takes place, in which the strip 1 is annealed.
  • This heat treatment is carried out in a reducing atmosphere with an H 2 content of 2% to 8% and balance N 2 .
  • the iron oxide layer prevents alloying constituents from diffusing to the strip surface. Since the annealing treatment takes place in a reducing atmosphere, the iron oxide layer is converted into a pure iron layer.
  • the strip 1 is further cooled on its further way in the direction of the hot dip bath 7, so that when leaving the continuous furnace 5, it has about the temperature of the hot dip bath 7 of about 480 ° C. Since the strip 1 is made of pure iron after leaving the continuous furnace 5 on its surface, it provides the zinc of the hot-dip bath 7 an optimal basis for a strong bond.

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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)
  • Heat Treatment Of Sheet Steel (AREA)

Claims (5)

  1. Procédé de galvanisation à chaud au trempé, en continu, d'une bande en acier de résistance supérieure avec différents composants d'alliage, en particulier Mn, Al, Si et / ou Cr, dans un bain de fusion d'au moins 85 % de zinc et / ou d'aluminium au total, au cours des étapes et dans les conditions suivantes :
    a) la bande est chauffée en 250 secondes au maximum, sous une atmosphère réductrice, avec une teneur en H2 de 2 % à 8 % au minimum, à une température de 650 °C à 750 °C, à laquelle les composants d'alliage ne diffusent pas encore ou seulement en faibles quantités ;
    b) la surface, consistant en plus grande partie en fer pur, est transformée par un traitement à chaud de la bande pendant une durée de 1 à 10 secondes, à une température de 650 °C à 750 °C, dans une chambre de réaction, intégrée dans un four continu, sous une atmosphère oxydante, avec une teneur en O2 de 0,01 % à 1 %, en une couche d'oxyde de fer ;
    c) la bande est ensuite recuite sous une atmosphère réductrice avec une teneur en H2 de 2 % à 8 %, par poursuite du chauffage jusqu'à une température de 900 °C au maximum et refroidie ensuite jusqu'à la température du bain de fusion pour réduire la couche d'oxyde de fer en fer pur, au moins sur sa surface, sachant que la poursuite du chauffage, avec refroidissement consécutif de la bande, dure plus de 50 secondes ;
    d) la durée du traitement à chaud de la bande sous l'atmosphère réductrice, aussi bien lors du chauffage (étape a) que lors du recuit ultérieur (étape c), est supérieure d'un multiple à celle du traitement à chaud sous l'atmosphère oxydante (étape b);
  2. Procédé selon la revendication 1, caractérisé en ce que la couche d'oxyde de fer produite est complètement réduite en fer pur.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que l'acier de résistance supérieure contient au moins un choix des composants d'alliage suivants : Mn > 0,5% %, A1 > 0,2 %, Si > 0,1 %, Cr > 0,3 %
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le traitement à chaud de la bande est effectué sous l'atmosphère réduite, dans un four continu avec une chambre intégrée sous atmosphère oxydante, sachant que le volume de la chambre par rapport au reste du volume du four continu est plus petit d'un multiple.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que la bande est traitée à chaud après la galvanisation à chaud.
EP05812469A 2004-12-09 2005-12-02 Procede de galvanisation a chaud d'une bande d'acier de resistance superieure Active EP1819840B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05812469T PL1819840T3 (pl) 2004-12-09 2005-12-02 Sposób powlekania zanurzeniowego taśmy ze stali o podwyższonej wytrzymałości

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004059566A DE102004059566B3 (de) 2004-12-09 2004-12-09 Verfahren zum Schmelztauchbeschichten eines Bandes aus höherfestem Stahl
PCT/EP2005/012942 WO2006061151A1 (fr) 2004-12-09 2005-12-02 Procede de galvanisation a chaud d'une bande d'acier de resistance superieure

Publications (2)

Publication Number Publication Date
EP1819840A1 EP1819840A1 (fr) 2007-08-22
EP1819840B1 true EP1819840B1 (fr) 2012-08-29

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Country Status (12)

Country Link
US (1) US8652275B2 (fr)
EP (1) EP1819840B1 (fr)
JP (1) JP4918044B2 (fr)
KR (1) KR101303337B1 (fr)
CN (1) CN101103133B (fr)
BR (1) BRPI0518623B1 (fr)
CA (1) CA2590560C (fr)
DE (1) DE102004059566B3 (fr)
ES (1) ES2394326T3 (fr)
PL (1) PL1819840T3 (fr)
RU (1) RU2367714C2 (fr)
WO (1) WO2006061151A1 (fr)

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EP3511430A1 (fr) 2018-01-12 2019-07-17 SMS Group GmbH Procédé de traitement thermique en continu d'une bande en acier et installation de revêtement par immersion en bain fondu d'une bande en acier

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3511430A1 (fr) 2018-01-12 2019-07-17 SMS Group GmbH Procédé de traitement thermique en continu d'une bande en acier et installation de revêtement par immersion en bain fondu d'une bande en acier

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RU2367714C2 (ru) 2009-09-20
RU2007125701A (ru) 2009-01-20
BRPI0518623A2 (pt) 2008-12-02
KR20070093415A (ko) 2007-09-18
US20080308191A1 (en) 2008-12-18
CA2590560A1 (fr) 2006-06-15
WO2006061151A1 (fr) 2006-06-15
BRPI0518623B1 (pt) 2016-05-17
JP2008523243A (ja) 2008-07-03
KR101303337B1 (ko) 2013-09-03
EP1819840A1 (fr) 2007-08-22
CA2590560C (fr) 2012-06-19
US8652275B2 (en) 2014-02-18
JP4918044B2 (ja) 2012-04-18
CN101103133A (zh) 2008-01-09
ES2394326T3 (es) 2013-01-30
CN101103133B (zh) 2011-04-20
PL1819840T3 (pl) 2013-01-31
DE102004059566B3 (de) 2006-08-03

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