EP2054536B1 - Procédé de recouvrement d'un feuillard d'acier laminé à chaud ou à froid et contenant de 6 à 30 % en poids de mn par une couche métallique de protection - Google Patents

Procédé de recouvrement d'un feuillard d'acier laminé à chaud ou à froid et contenant de 6 à 30 % en poids de mn par une couche métallique de protection Download PDF

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EP2054536B1
EP2054536B1 EP07802701A EP07802701A EP2054536B1 EP 2054536 B1 EP2054536 B1 EP 2054536B1 EP 07802701 A EP07802701 A EP 07802701A EP 07802701 A EP07802701 A EP 07802701A EP 2054536 B1 EP2054536 B1 EP 2054536B1
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Prior art keywords
coating
steel strip
content
zinc
annealing
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German (de)
English (en)
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EP2054536A2 (fr
Inventor
Manfred Meurer
Ronny Leuschner
Harald Hofmann
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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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
    • C23C2/02—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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/11—Making amorphous alloys
    • 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
    • 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
    • C23C2/022—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
    • C23C2/02—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
    • 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
    • C23C2/26—After-treatment
    • 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
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • 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

  • the invention relates to a process for coating a hot-rolled or cold-rolled steel strip containing 6 to 30% by weight of Mn with a metallic protective layer, in particular a zinc-based protective layer, in which the steel strip to be coated is heated below 800 to 1100 ° C annealed a nitrogen, water and hydrogen-containing annealing atmosphere and then subjected to a hot-dip coating.
  • steels with high manganese contents are, due to their favorable combination of properties consisting of high strengths of up to 1,400 MPa on the one hand and extremely high strains (uniform strains of up to 70% and elongations at break of up to 90%), in principle particularly suitable for use in the field of vehicle construction , especially in the automotive industry.
  • particularly suitable steels with high Mn contents of 6 wt .-% to 30 wt .-% are for example from DE 102 59 230 A1 , of the DE 197 27 759 C2 or the DE 199 00 199 A1 known. From the known steels produced flat products have at high strengths isotropic deformation behavior and are still ductile even at low temperatures.
  • JP 07-216524 A discloses a method of hot dipping a hot rolled steel plate having a high tensile strength.
  • the steel plate is first descaled, pickled and cleaned. Then, it is lightly oxidized to produce thereon an iron oxide film having a thickness of 500 - 10,000 ⁇ .
  • This iron oxide film is then reduced by reducing heating to active metallic iron. The reducing heating is carried out in such a way that a selective oxidation of Si and Mn in the steel and a concentration of these elements on the surface are avoided.
  • the reductive heating is carried out under an atmosphere whose hydrogen concentration is controlled in the range of 3 to 25% by volume so as to have a reducing ability sufficient for the reduction of the iron oxide but omitting the selective oxidation of Si and Mn ,
  • EP1612288 discloses a process for coating a 0.1 to 2.5 wt% Mn-containing steel strip with a zinc-based protective layer in which the steel strip to be coated is annealed at 650 to 900 ° C under a nitrogen, water and hydrogen containing Annealing annealed and then subjected to a hot dip coating.
  • BE1011131A6 discloses a method for coating a steel strip with a zinc-based protective layer, in which the steel strip to be coated is annealed under an annealing atmosphere and then subjected to hot-dip coating.
  • the ratio of the water content to the hydrogen content of the annealing atmosphere is between 0.07 and 0.35.
  • the object of the invention was to provide a method by which high cost manganese steel sheets can be hot dip coated in a cost effective manner.
  • the ratio% H 2 O /% H 2 of the water content% H 2 O to hydrogen Content% H 2 of the annealing atmosphere is set as a function of the respective annealing temperature T G as follows: % H 2 ⁇ O / % H 2 ⁇ 8th ⁇ 10 - 15 ⁇ T G 3 . 529
  • the invention is based on the recognition that, by a suitable setting of the annealing atmosphere, namely its hydrogen content in relation to its water content and its dew point, a surface finish of the steel strip to be coated sets during the annealing, the optimum adhesion of the subsequently applied by hot-dip coating ensured metallic protective coating.
  • the inventively set annealing atmosphere acts both with respect to the iron and against the manganese of the steel strip reducing.
  • the formation of a according to the inventors the adhesion of the melt coating on the high manganese steel substrate impairing oxide layer thus deliberately avoided.
  • the annealing and the hot dip coating can be carried out in a continuous pass.
  • This type of application of the method according to the invention is particularly suitable when the coating is carried out in a conventional coil coating plant, in which an annealing furnace and the hot dip are arranged inline in the usual way and are run continuously in succession in an uninterrupted sequence.
  • the inventive method is suitable for hot dip coating of high manganese steel strips with a substantially completely consisting of Zn and unavoidable impurities layer (so-called "Z-coating”), with a zinc-iron layer, which consists of up to 92 wt .-% Zn and up to 12% by weight of Fe (so-called “ZF coating”), with an aluminum-zinc layer whose Al content is up to 60% by weight and whose Zn content is up to 50% by weight.
  • the coating procedure according to the invention is particularly suitable for steel strips which are highly alloyed in order to ensure high strength and good elongation properties.
  • the steel strips which are provided with a metallic protective coating by hot-dip coating according to the invention typically contain (in% by weight) C: ⁇ 1.6%, Mn: 6 - 30%, Al: ⁇ 10%, Ni: ⁇ 10%, Cr: ⁇ 10%, Si: ⁇ 8%, Cu: ⁇ 3%, Nb: ⁇ 0.6%, Ti: ⁇ 0.3%, V: ⁇ 0.3%, P: ⁇ 0 , 1%, B: ⁇ 0.01%, N: ⁇ 1.0%, balance iron and unavoidable impurities.
  • a steel which (in wt .-%) C: ⁇ 1.00%, Mn: 7.00 - 30.00%, Al: 1.00 - 10.00%, Si :> 2.50 - 8.00% (assuming that the sum of Al content and Si content is> 3.50 - 12.00%), B: ⁇ 0.01%, Ni: ⁇ 8, 00%, Cu: ⁇ 3.00%, N: ⁇ 0.60%, Nb: ⁇ 0.30%, Ti: ⁇ 0.30%, V: ⁇ 0.30%, P: ⁇ 0.01% , Rest contains iron and unavoidable impurities.
  • both hot-rolled and cold-rolled steel strips can be coated in accordance with the invention.
  • the steel strips are first cleaned in a continuous operating sequence and then held in a continuous annealing process to the respective annealing temperature T G , on which they have been held over an annealing time Z G of 30 seconds under a set according to the invention hydrogen-containing annealing atmosphere, has been brought.
  • the annealed steel strips were each cooled to a bath inlet temperature of 470 ° C and passed in a continuous pass through a 460 ° C hot zinc molten bath consisting of 0.2% Al and balance of Zn and unavoidable impurities. After exiting the zinc molten bath, the thickness of the Zn protective coating on the steel strip has been adjusted in a manner known per se by means of a nozzle scraper system.
  • the steel strip provided with the coating can be oiled for transport to the end user and wound up into a coil.
  • test series V1 comprised five experiments V1.1 - V1.5 with a steel strip produced from steel S1. in the In the course of the test series V2, seven experiments V2.1 - V2.7 were carried out with a steel strip made of steel S2. In test series V3, eleven tests were finally carried out on a steel strip made of steel S3.
  • the ratio% H 2 O /% H 2 is plotted against the annealing temperature T G.
  • the area located below this curve is "E" in which according to the condition % H 2 ⁇ O / % H 2 ⁇ 8th ⁇ 10 - 15 ⁇ T G 3 . 529 the ratios% H 2 O /% H 2 maintained in the inventive setting of the annealing atmosphere are separated from the region "N" located above the curve K, in which the ratios% H 2 O /% H 2 of an atmosphere not adjusted according to the invention are arranged.
  • FIG. 4 shows the result of a ball impact test carried out on the steel sheet coated in experiment V1.2.
  • the poor adhesion of the coating to the steel substrate is evidenced by the cracks in the most deformed area of the cup formed in the steel sheet.
  • Table 1 stolen C Si Mn P Cr Ni V S1 0.60 0.28 22.5 0,021 0,003 0.077 0,006 S2 0.63 0.20 22.2 0,014 0.130 0.046 0,200 S3 0.62 0.30 22.5 0,018 0,600 0,170 0,300 Data in wt .-%, balance Fe and unavoidable impurities attempt T G [° C] % H 2 [%] TP [° C] % H 2 O [%] % H 2 O /% H 2 Evaluation of galvanizing According to the invention V1.1 850 50 -31 0.03375 0.0006750 Bad No V1.2 850 100 -30 0.03747 0.0003747 Bad No V1.3 900 50 -38 0.01584 0.0003168 Bad No V1.4 950 50

Claims (14)

  1. Procédé de revêtement d'un feuillard d'acier laminé à chaud ou à froid, qui contient de 6 à 30 % en poids de Mn, par une couche métallique de protection, en particulier avec une couche de protection à base de zinc, procédé au cours duquel le feuillard d'acier à recouvrir est recuit à une température de recuit de 800 à 1100 °C, dans une atmosphère de recuit contenant de l'azote, de l'eau et de l'hydrogène, et est ensuite soumis à un revêtement par immersion dans un bain de fusion, caractérisé en ce que, pour réaliser sur le feuillard une couche métallique de protection sensiblement exempte de couches intermédiaires d'oxydes, on ajuste comme suit le rapport %H2O / %H2 de la teneur en eau % H2O à la teneur en hydrogène %H2, de l'atmosphère de recuit, en fonction de la température de recuit TG : % H 2 ⁢ O / % H 2 ≤ 8 - 10 - 15 . T G 3 , 529 .
    Figure imgb0005
  2. Procédé selon la revendication 1, caractérisé en ce qu'un laminage du feuillard d'acier est exécuté avant le revêtement par immersion dans un bain de fusion.
  3. Procédé selon la revendication 2, caractérisé en ce que le laminage est exécuté en plusieurs phases de laminage et que le feuillard d'acier est recuit selon la détermination de la revendication 1, entre chaque phase de laminage.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que le recuit et le revêtement par immersion dans un bain de fusion sont effectués en passage continu.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que le revêtement métallique consiste sensiblement entièrement en Zn et en impuretés inévitables.
  6. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le revêtement métallique est un revêtement de zinc et de fer, avec une teneur en Zn allant jusqu'à 92 % en poids et une teneur en Fe allant jusqu'à 12 % en poids.
  7. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le revêtement métallique est un revêtement d'aluminium et de zinc, avec une teneur en Al allant jusqu'à 60 % en poids et une teneur en Zn allant jusqu'à 50 % en poids.
  8. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le revêtement métallique est un revêtement d'aluminium et de silicium, avec une teneur en Al allant jusqu'à 92 % et une teneur en Si allant jusqu'à 12 % en poids.
  9. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le revêtement métallique est un revêtement de zinc et d'aluminium, qui présente une teneur en Al allant jusqu'à 10 % en poids, le complément étant du zinc et des impuretés inévitables.
  10. Procédé selon l'une des revendications 1 à 4, caractérisé en ce le revêtement métallique est un revêtement de zinc et de magnésium, qui contient jusqu'à 99,5 % en poids de Zn et jusqu'à 5 % en poids de Mg.
  11. Procédé selon la revendication 10, caractérisé en ce que le revêtement de zinc et de magnésium contient jusqu'à 11 % en poids d'Al, jusqu'à 4 % en poids de Fe et jusqu'à 2 % en poids de Si.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que le feuillard d'acier contient (en % en poids) C : ≤ 1,6 %, Mn : 6 - 30 %, Al : ≤ 10 %, Ni : ≤ 10 %, Cr : ≤ 10 %, Si : ≤ 8 %, Cu : ≤ 3 %, Nb : ≤ 0,6 %, Ti : ≤ 0,3 %, V : ≤ 0,3 %, P : ≤ 0,1 %, B : ≤ 0,01 %, N : ≤ 1,0 %, le complément étant du fer et des impuretés inévitables.
  13. Procédé selon la revendication 12, caractérisé en ce que le feuillard d'acier contient (en % en poids) C : ≤ 1,00 %, Mn : 20,0 - 30,0 %, Al : ≤ 0,5 %, Si : ≤ 0,5 %, B : ≤ 0,01 %, Ni : ≤ 3, 0 %, Cr : ≤ 10, 0 %, Cu : ≤ 3, 0 %, N : < 0, 6 %, Nb : < 0, 3 %, Ti : < 0,3 %, V : < 0, 3 %, P : < 0,1 %, le complément étant du fer et des impuretés inévitables.
  14. Procédé selon l'une des revendications 1 à 12, caractérisé en ce que le feuillard d'acier contient (en % en poids) C : ≤ 1,00 %, Mn : 7,00 - 30,00 %, B : < 0,01 %, Ni : < 8,00 %, Cu : < 3,00 %, N : < 0,60 %, Nb : < 0,30 %, Ti : < 0,30 %, V : < 0,30 %, P : < 0,01 %, ainsi que Al : 1,00 - 10,00 % et Si > 2,50 - 8,00 %, avec la condition d'une teneur en Al + teneur en Si > 3,50 - 12,00 %, le complément étant du fer et des impuretés inévitables.
EP07802701A 2006-08-22 2007-08-20 Procédé de recouvrement d'un feuillard d'acier laminé à chaud ou à froid et contenant de 6 à 30 % en poids de mn par une couche métallique de protection Active EP2054536B1 (fr)

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PL07802701T PL2054536T3 (pl) 2006-08-22 2007-08-20 Sposób powlekania stalowej taśmy walcowanej na gorąco lub na zimno, zawierającej 6-30% wagowych Mn, z metaliczną warstwą ochronną

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DE102006039307A DE102006039307B3 (de) 2006-08-22 2006-08-22 Verfahren zum Beschichten eines 6-30 Gew.% Mn enthaltenden warm- oder kaltgewalzten Stahlbands mit einer metallischen Schutzschicht
PCT/EP2007/058602 WO2008022980A2 (fr) 2006-08-22 2007-08-20 Procédé de recouvrement d'un feuillard d'acier laminé à chaud ou à froid et contenant de 6 à 30 % en poids de mn par une couche métallique de protection

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EP2054536A2 (fr) 2009-05-06
AU2007287602A1 (en) 2008-02-28
ES2353438T3 (es) 2011-03-02
JP2010501725A (ja) 2010-01-21
WO2008022980A2 (fr) 2008-02-28
CN101506403A (zh) 2009-08-12
AU2007287602B2 (en) 2010-11-25
CA2660398C (fr) 2013-11-05
US20100065160A1 (en) 2010-03-18
ATE486974T1 (de) 2010-11-15
CA2660398A1 (fr) 2008-02-28
KR101463221B1 (ko) 2014-11-19
US8394213B2 (en) 2013-03-12
DE102006039307B3 (de) 2008-02-21
CN101506403B (zh) 2011-12-28
PL2054536T3 (pl) 2011-04-29
DE502007005570D1 (de) 2010-12-16
KR20090040349A (ko) 2009-04-23

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