EP2054536A2 - 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

Info

Publication number
EP2054536A2
EP2054536A2 EP07802701A EP07802701A EP2054536A2 EP 2054536 A2 EP2054536 A2 EP 2054536A2 EP 07802701 A EP07802701 A EP 07802701A EP 07802701 A EP07802701 A EP 07802701A EP 2054536 A2 EP2054536 A2 EP 2054536A2
Authority
EP
European Patent Office
Prior art keywords
coating
steel strip
content
zinc
weight
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
EP07802701A
Other languages
German (de)
English (en)
Other versions
EP2054536B1 (fr
Inventor
Manfred Meurer
Ronny Leuschner
Harald Hofmann
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel 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
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Application filed by ThyssenKrupp Steel AG filed Critical ThyssenKrupp Steel AG
Priority to PL07802701T priority Critical patent/PL2054536T3/pl
Publication of EP2054536A2 publication Critical patent/EP2054536A2/fr
Application granted granted Critical
Publication of EP2054536B1 publication Critical patent/EP2054536B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C23C2/02—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 method for coating a 6-30 wt .-% Mn-containing hot- or cold-rolled steel strip with a metallic protective layer, in particular a protective layer based on zinc, wherein the steel strip to be coated at a 800-1100 C 0 amount forming annealing temperature under 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%), 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 known for example from DE 102 59 230 Al, DE 197 27 759 C2 or DE 199 00 199 Al. From the known steels produced flat products have at high strengths isotropic deformation behavior and are still ductile even at low temperatures.
  • Another method for coating a high manganese-containing, from 0.35 to 1.05 wt .-% C, 16 to 25 wt .-% Mn, balance iron and unavoidable impurities containing steel strip is known from WO 2006/042931 Al.
  • the steel strip thus composed is first cold-rolled and then annealed recrystallizing in an atmosphere which is reducing with respect to iron.
  • the annealing parameters are selected such that on both sides of the steel strip an intermediate layer is formed, which consists essentially completely of amorphous oxide (FeMn) O, and additionally adjusts an outer layer consisting of crystalline Mn oxide, wherein the thickness of two layers is at least 0.5 microns.
  • Practical investigations have shown that even such complex precoated steel strips in practice not have the required for a cold deformation adhesion to the steel substrate.
  • 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 power sufficient for the reduction of iron oxide but to prevent the selective oxidation of Si and Mn ,
  • 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.
  • This object has been achieved in a method of the type specified in that according to the invention for the production of a substantially free of oxidic interlayers metallic protective layer on the steel strip, 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:
  • the invention is based on the recognition that by a suitable adjustment of the annealing atmosphere, namely its hydrogen content in relation to their water content and their dew point, adjusts a surface finish of the steel strip to be coated during annealing, the optimal adhesion of the subsequently by Ensures hot dip coating applied 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, according to the inventors, adhesion of the melt coating to the high manganese steel substrate impairing oxide layer thus deliberately avoided.
  • Typical applied in an inventive method calcination temperatures are in the range of 800 - 1100 0 C. Over the entire range of annealing temperatures should according to the invention, the% H 2 O /% H 2 - ratio are each below 4.5 * 10 ⁇ . 4
  • the steel strip processed according to the invention is cold rolled one or more times, then the steel strip can be annealed under the annealing atmosphere set according to the invention during the intermediate annealing carried out between the individual cold rolling steps or during the annealing carried out after the cold rolling to prepare the hot dip coating.
  • 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 method according to the invention is suitable for hot dip coating of high manganese steel strips with a layer consisting essentially entirely of Zn and unavoidable impurities
  • Z-coating with a zinc-iron layer, which consists of up to 92 wt .-% Zn and up to 12 wt .-% Fe (so-called "ZF coating"), with a Aluminum-zinc layer, whose Al content up to 60 wt .-% and whose Zn content up to 50 wt .-% (so-called "ZF coating"
  • AZ coating is, with an aluminum-silicon layer having an Al content of up to 92% by weight and a Si content of up to 12 wt .-% (see called “AS coating”), with a zinc-aluminum layer having a content of up to 10 wt .-% Al, balance zinc and unavoidable impurities (so-called “ZA coating”) or with a zinc magnesium Layer which has a Zn content of up to 99.5% by weight and an Mg content of up to 5% by weight (so-called “ZnMg coating”) and additionally optionally up to 11% by weight.
  • % Al, up to 4 wt .-% Fe and up to 2 wt .-% Si may contain.
  • 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.
  • Mn 20.0 - 30.0%
  • Al ⁇ 0.5%
  • Si ⁇ 0.5%
  • B ⁇ 0.01%
  • 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.
  • Fig. 1 shows the inclusion of a provided according to the invention with a zinc coating steel sheet after a ball impact test
  • Figure 2 shows the inclusion of a comparison with in a deviating from the invention manner with a zinc-coated steel sheet after a ball impact test.
  • Fig. 3 shows the inclusion of a second provided in accordance with the invention with a zinc coating steel sheet after a ball impact test
  • Figure 4 shows the inclusion of a second comparison provided in a deviating from the invention manner with a zinc-coated steel sheet after a ball impact test.
  • Diag. 1 the ratio% H 2 O /% H 2 of the water content% H 2 O to the hydrogen content% H 2 of the annealing atmosphere as a function of the annealing temperature
  • the annealed steel strips were each cooled to a bath inlet temperature of 470 0 C and passed in a continuous pass through a 460 0 C hot zinc molten bath, which consisted of 0.2% Al and the remainder of Zn and unavoidable impurities. After leaving 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 scraping 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 Vl comprised five experiments Vl .1 - Vl .5 with a steel strip produced from the steel Sl. 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 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. 1 shows the result of a ball impact test, which was carried out on the obtained from the experiment Vl.4, provided with the Zn protective coating steel is. The perfect adhesion of the coating even in the most deformed area of the molded into the steel sheet dome is clearly visible.
  • Fig. 2 shows the result of a ball impact test, which has been carried out on the steel sheet resulting from experiment Vl .1. The flaking of the coating in the area of the dome formed in the steel sheet are clearly visible.
  • Fig. 3 shows the result of a ball impact test, which was carried out on the steel sheet obtained in experiment Vl .5. Also in this invention coated sample, the coating adheres properly over the entire molded into the sheet dome.
  • FIG. 4 shows the result of a ball impact test, which was carried out on the steel sheet coated in experiment VI.1.
  • 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.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

La présente invention concerne un procédé de revêtement 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 et en particulier une couche de protection à base de zinc, dans lequel le feuillard d'acier à revêtir est recuit à une température de recuit comprise entre 800 - 1100 °C dans une atmosphère de recuit qui contient de l'azote, de l'eau et de l'hydrogène, et subit ensuite un revêtement par immersion dans un bain. Le procédé selon l'invention permet de manière économique de revêtir par immersion dans un bain des tôles d'acier qui présentent une haute teneur en manganèse. On obtient ce résultat en réglant le rapport %H<SUB>2</SUB>O/%H<SUB>2</SUB> de la teneur en eau %H<SUB>2</SUB>0 à la teneur en hydrogène % H<SUB>2</SUB> de l'atmosphère de recuit en fonction de la température particulière de recuit T<SUB>G</SUB>
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 Not-in-force EP2054536B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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

Publications (2)

Publication Number Publication Date
EP2054536A2 true EP2054536A2 (fr) 2009-05-06
EP2054536B1 EP2054536B1 (fr) 2010-11-03

Family

ID=38955140

Family Applications (1)

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EP07802701A Not-in-force EP2054536B1 (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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JP (1) JP2010501725A (fr)
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CN (1) CN101506403B (fr)
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AU (1) AU2007287602B2 (fr)
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DE (2) DE102006039307B3 (fr)
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ES2353438T3 (es) 2011-03-02
DE502007005570D1 (de) 2010-12-16
JP2010501725A (ja) 2010-01-21
AU2007287602B2 (en) 2010-11-25
CA2660398A1 (fr) 2008-02-28
EP2054536B1 (fr) 2010-11-03
ATE486974T1 (de) 2010-11-15
WO2008022980A2 (fr) 2008-02-28
CN101506403A (zh) 2009-08-12
KR101463221B1 (ko) 2014-11-19
US20100065160A1 (en) 2010-03-18
CN101506403B (zh) 2011-12-28
WO2008022980A3 (fr) 2008-10-30
DE102006039307B3 (de) 2008-02-21
CA2660398C (fr) 2013-11-05
KR20090040349A (ko) 2009-04-23
AU2007287602A1 (en) 2008-02-28
PL2054536T3 (pl) 2011-04-29
US8394213B2 (en) 2013-03-12

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