WO2020007459A1 - Tôle fine à froid galvanisée possédant des propriétés de matériau homogènes - Google Patents

Tôle fine à froid galvanisée possédant des propriétés de matériau homogènes Download PDF

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Publication number
WO2020007459A1
WO2020007459A1 PCT/EP2018/068091 EP2018068091W WO2020007459A1 WO 2020007459 A1 WO2020007459 A1 WO 2020007459A1 EP 2018068091 W EP2018068091 W EP 2018068091W WO 2020007459 A1 WO2020007459 A1 WO 2020007459A1
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WO
WIPO (PCT)
Prior art keywords
flat steel
steel product
against corrosion
annealing
flat
Prior art date
Application number
PCT/EP2018/068091
Other languages
German (de)
English (en)
Inventor
Robert YANIK
Bastian Schöntaube
Yavuz Dogan
Thomas Brixius
Original Assignee
Thyssenkrupp Steel Europe Ag
Thyssenkrupp 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
Application filed by Thyssenkrupp Steel Europe Ag, Thyssenkrupp Ag filed Critical Thyssenkrupp Steel Europe Ag
Priority to PCT/EP2018/068091 priority Critical patent/WO2020007459A1/fr
Priority to EP19733645.6A priority patent/EP3752652A1/fr
Priority to PCT/EP2019/065793 priority patent/WO2020007594A1/fr
Publication of WO2020007459A1 publication Critical patent/WO2020007459A1/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
    • C23C2/04—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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/76—Adjusting the composition of the atmosphere
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • 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
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching

Definitions

  • the present invention relates to a method for producing a flat steel product with a protective coating against corrosion, a corresponding flat steel product, a component obtained therefrom by deformation and its use in the automotive sector, in particular for commercial vehicles, in particular trucks, construction machines and earth moving vehicles, in the industrial sector, for example as Housing or telescope rails, in the construction sector, for example as facade elements, for household appliances, in the energy sector, in shipbuilding.
  • US 2016/339491 A1 discloses a method for producing a zinc-coated sheet. For this purpose, a cold-rolled steel strip is rolled with a textured roller and then electrolytically coated with a zinc layer that protects against corrosion.
  • US 2012/0107636 A1 discloses a method for coating a flat steel product with a coating which protects against corrosion, in particular a coating containing Zn. After the actual coating process, excess liquid metal is removed in a stripping device with a certain geometry.
  • a common test condition for recording the surface change after forming is a biaxial stretching with 3.5% or 5% elongation.
  • the ripple is only measured in the profile section (see SEP 1941).
  • various measuring methods such as confocal light microscopy or laser scanning, are also suitable for capturing the surface not only along a line, but also in three dimensions.
  • the basis of the invention is the knowledge that a ripple characteristic value, which is determined from such a flat topography measurement, can reflect the appearance of the surface after painting more meaningfully than a simple profile characteristic value.
  • Profile filtering takes place only in one spatial direction. At a Area measurement, the folding operation is possible in both lateral directions. This is more realistic because the counterpart to filtering, the lacquer layer, does not cover the roughness in a linear manner, but rather over a large area.
  • the measuring surface must have a width of at least 0.5 mm and a length of at least 25 mm.
  • the lateral resolution of the measuring points must be at least 10 pm.
  • the flea data must be aligned in the area.
  • the aligned data are low-pass filtered using a surface filter in accordance with DIN EN ISO 16610-61: 2012.
  • the weight function of the area filter has the equation of a rotationally symmetrical Gaussian function with a cutoff wavelength lw of 0.6 mm.
  • a profile or several profiles are extracted from the topography measurement data along the measurement direction, and the profile or the profiles is / are high-pass filtered in accordance with the DIN EN ISO 11562 standard with a cutoff wavelength of 5 mm. From the flea data, the square mean or square mean QMW (root mean sguare RMS) is calculated and the SWg value is thus obtained.
  • the object of the present invention is to provide a method for the manufacture of flat steel products provided with a protective coating against corrosion, with which it can be ensured that corresponding flat steel products are obtained which, in a reshaping provided in the further process, do not cause any significant change which would interfere with the paint appearance experienced in the surface topography.
  • step (B) optionally cleaning the flat steel product from step (A),
  • the objects are further achieved by the flat steel product produced according to the invention and its use.
  • the deformation-related topography changes which are noticeable in the areal ripple value or after painting, result in cold-rolled thin sheet with a BH2 value according to SEW094 of more than 5 MPa from the usual manufacturing conditions, which lead to anisotropy of the material via the sheet metal cross-section in combination with a pronounced elongation limit, which then leads to flow figures on the surface.
  • the material anisotropy along the sheet cross-section is characterized by an inhomogeneous distribution of the free carbon. Elongation at stretch is caused by the interposition atoms dissolved in the structure, including the free carbon.
  • Elongation at yield point leads to the formation of flow figures on the component surface and is therefore undesirable for the purposes sought in the present invention application.
  • the free carbon content can be reduced, for example, by means of suitable measures, which would, however, also be associated with a disadvantageous reduction in the BH2 value.
  • this can be redistributed over the sheet cross-section in such a way that there is no significant reduction in the BH2 value, but stretching limit stretching and thus flow figures on the surface can be avoided.
  • the material anisotropy can be reduced in this way via the sheet metal cross section, which likewise leads to favorable long-wave properties of the surface.
  • a redistribution of the carbon content along the sheet thickness can be achieved by the procedure according to the invention, which leads to a homogeneous carbon distribution which corresponds to a low material anisotropy.
  • the combination of annealing temperature, annealing duration and dew point according to the invention makes it possible for the yield point elongation to be influenced positively, which contributes to the avoidance of flow figures during subsequent forming.
  • the yield point expansion results from the free carbon atoms in the material, which prevent the sliding of dislocations when deformation begins.
  • the material is decarburized in step (C) of the process by a targeted redistribution of the interstitially dissolved carbon atoms. If, for example, a too high dew point is set in the furnace in step (C), a lot of carbon is removed from the edge area of the material, which leads to an extreme concentration gradient between the core and the surface and, as a result, to a pronounced material anisotropy, which leads to an inhomogeneous Flow of the material along the sheet metal section is responsible during the forming process (eggshell effect).
  • step (C) makes it possible to maintain a previously set topography about a uniform flow of the material on the surface during the forming.
  • the individual steps of the method according to the present invention are described in detail below.
  • the process according to the invention can be carried out batchwise or continuously. In a preferred embodiment, it is carried out continuously.
  • Step (A) of the method according to the invention comprises providing a flat steel product.
  • step (A) of the method it is generally possible to use any flat steel product known to the person skilled in the art which can or should be provided with a coating which protects against corrosion.
  • a flat steel product is understood to be a sheet, a plate or a steel strip.
  • a steel strip is used before.
  • the flat steel product used in step (A) of the method according to the invention can be a hot strip or a cold strip.
  • a cold strip is preferably used according to the invention.
  • the flat steel product can generally be used in all thicknesses known to the person skilled in the art, for example 0.2 to 1.2 mm, preferably 0.5 to 0.9 mm. If a steel strip is used according to the invention, it preferably has a width of 500 to 2500 mm, particularly preferably 800 to 2000 mm.
  • the steel present in the flat steel product used according to the invention can generally have any composition.
  • the steel present in the flat steel product used according to the invention preferably has a composition which enables a BFI2 value of> 5 MPa.
  • a flat steel product is particularly preferably used, comprising a steel containing, in addition to Fe and unavoidable impurities (all data in% by weight)
  • the optional step (B) of the method according to the invention comprises cleaning the flat steel product from step (A).
  • Step (B) of the process according to the invention can generally be carried out by all processes known to the person skilled in the art.
  • the cleaning can be done mechanically by brushing, alkaline by appropriate cleaning agents, for example containing surfactants and / or defoamers, and / or electrolytically, for example by alternately switching the strip as cathode and anode.
  • the three methods mentioned can be used individually or usually in combination. If necessary, thermal cleaning can also be carried out on an open flame.
  • the flat steel product can be dried after cleaning, for example at elevated temperature and / or using air nozzles.
  • Step (C) of the method according to the invention comprises recrystallizing annealing of the flat steel product from step (A) or (B), step (C) being carried out in such a way that the process parameters annealing temperature in ° C, annealing duration in s and dew point in ° C within one three-dimensional coordinate system with the corner points A (870/190/15), B (870/190 / -25), C (830/190/15), D (830/190 / -25), E (870/381/0 ), K870 / 381 / -25), N (830/381 / -25), F (870/428/0), G (870/490 / 8.5), H (870/490 / -25), K (830/423/0), L (830/490 / -8.5), M (830/490 / -25), the annealing temperature in ° C by the x value, the annealing time in s by the y value and the dew point in ° C can be represented by the
  • the designation A (870/190/15) means, for example, a point in a three-dimensional coordinate system with the annealing temperature in ° C on the x-axis, the annealing duration in s on the y-axis and the dew point in ° C on the z- Axis.
  • the point therefore means, for example, that step (C) of the process according to the invention takes place at an annealing temperature of 870 ° C. for 190 s at a dew point of 15 ° C.
  • the recrystallizing annealing in step (C) is carried out under conditions which lie within the three-dimensional space spanned by the corner points A to M. If step (C) is carried out under these conditions, the technical advantages mentioned above are obtained. If step (C) is carried out under conditions which lie outside this three-dimensional space, the technical advantages mentioned above are not obtained.
  • step (C) of the process is carried out in such a way that the process parameters annealing temperature in ° C, annealing duration in s and dew point in ° C within a three-dimensional coordinate system with the corner points E (870/381/0 ), F (870/428/0), G (870/490 / -8.5), H (870/490 / -25), K870 / 381 / -25), J (830/381/0), K (830/423/0), L (830/490 / -8.5), M (830/490 / -25), N (830/381 / -25).
  • the present invention therefore preferably relates to the process according to the invention, the process parameters annealing temperature in ° C, annealing time in s and dew point in ° C within a three-dimensional coordinate natensystems with the corner points E (870/381/0), F (870/428/0), G (870/490 / -8.5), H (870/490 / -25), 1 (870/381 / - 25), J (830/381/0), K (830/423/0), L (830/490 / -8.5), M (830/490 / -25), N (830/381 / -25).
  • step (C) is not carried out in such a way that the process parameters annealing temperature in ° C, annealing duration in s and dew point in ° C within a three-dimensional coordinate system with the corner points 0 (870/434/0), P (870/490/0), Q (870/490 / -8), R (830/428/0), S (830/490/0), K830 / 490 / -8). If the method according to the invention were carried out in these areas, the above-mentioned technical advantages would not be obtained.
  • Step (C) of the method according to the invention can generally be carried out in all devices known to the person skilled in the art, in which it is possible to control the annealing temperature, annealing duration and dew point so that these values lie in the ranges according to the invention.
  • Preferred devices for step (C) of the process according to the invention are preferably continuously operating furnaces, for example a continuous annealing furnace of an FBA (fire coating system) or continuous annealing, or non-continuously operating furnaces, for example by bell annealing.
  • Step (D) of the method according to the invention comprises the application of a protective coating against corrosion to the flat steel product from step (C).
  • a coating containing zinc is preferably applied as a protective coating against corrosion.
  • a zinc-containing coating is preferably applied by a hot-melt dipping method known to the person skilled in the art or by electrolytic deposition. Methods for hot dip coating are described, for example, in US 2015/292072 A1, US 2016/339491 A1, US 2012/0107636 A1 and in our own application DE 10 2017 216 572.3.
  • Electrolytic processes for the deposition of a zinc-containing layer are also known to the person skilled in the art and are described, for example, in WO 2015/114405.
  • a coating protecting against corrosion is preferably applied, containing 0.1 to 2.0% by weight of Al and optionally 0.1 to 3% by weight of Mg, the rest being Zn and inevitable impurities.
  • the corrosion-protecting coating is further preferably applied by hot dip coating.
  • the present invention therefore preferably relates to the process according to the invention, step (D) being carried out by hot-dip coating in a melt bath, containing 0.1 to 2.0% by weight of Al and optionally 0.1 to 3% by weight of Mg, the remainder being Zn and inevitable impurities.
  • the desired layer thickness or the desired coating weight is set by methods known to the person skilled in the art, for example using scraping nozzles.
  • the protective coating against corrosion is preferably present in a coating weight of 20 to 100 g / m 2 , preferably 30 to 80 g / m 2 , in each case on each side of the flat steel product.
  • the applied coatings protecting against corrosion can optionally be diffusion annealed, for example at 450 to 550 ° C., so that an Fe content of 0.1 to 15% by weight, preferably 4 to 10% by weight, is found in the corrosion protection protective coating.
  • the present invention therefore preferably relates to the method according to the invention, the coating protecting against corrosion being diffusion annealed.
  • Step (E) of the method according to the invention comprises the dressing of the flat steel product from step (D).
  • step (E) of the method according to the invention can be carried out by all methods known to the person skilled in the art. Methods known to the person skilled in the art which can be used here are, for example
  • EDT electric discharge texturing
  • oscillating electrodes are attached to the rotating roller, the roller surface melts locally due to the current flow, when the current is switched off gas bubbles that have formed on the surface implode and material is thrown out;
  • EBT Electro Beam Texturing
  • ECD Electro Chemical Deposition
  • EDT-textured rollers are preferably used according to the invention.
  • the roughnesses Ra of the work rolls used are preferably less than or equal to 4.0 pm, particularly preferably less than or equal to 2.7 pm, very particularly preferably less than or equal to 2.2 pm. According to the invention, the work roll roughness is preferably at least 0.5 pm.
  • Step (F) of the method according to the invention comprises coiling the coated steel flat product from step (E).
  • step (F) of the method according to the invention the flat steel product obtained from step (E) is provided with a corrosion-protective coating, i.e. wound into a coil.
  • the reeling in step (F) of the method according to the invention can be carried out by all methods known to the person skilled in the art.
  • the flat steel product obtained by the process according to the invention comprising at least steps (A), (B), (C), (D), (E) and (F) is particularly suitable on account of the advantages described above, for further processing by forming into components , which are used, for example, as the outer skin of vehicles, in particular automobiles.
  • the present invention therefore further relates to a method for producing a component, comprising at least the following steps:
  • step (H) reshaping the steel flat product from step (G) to obtain the component.
  • Step (G) of the method according to the invention comprises providing a flat steel product with a coating protecting against corrosion by the method according to the invention.
  • This method according to the invention comprises at least steps (A), (B), (C), (D), (E) and (F) as described above.
  • step (F) of the method according to the invention the flat steel product emerges in coiled form as a coil. It is therefore preferred according to the invention to unroll the flat steel product obtained from step (F) before step (G) and, if necessary, to smooth and / or clean it.
  • the flat steel product passes through a set of processor straightening rollers, in particular for leveling any unevenness, is then cut into boards of the desired shape and, if necessary, treated with methods known to the person skilled in the art, for example oiling, cleaning, etc.
  • Step (H) of the method according to the invention comprises shaping the flat steel product from step (G) in order to obtain the component.
  • Appropriate methods are known per se to the person skilled in the art.
  • Step (G) of the method according to the invention is preferably carried out by cold working.
  • the flat steel product which is preferably obtained as a steel strip, is first cut or punched into corresponding sheets or blanks. These sheets or blanks are then placed in an appropriate forming tool and shaped under pressure.
  • the present invention also relates to a flat steel product provided with a corrosion-protecting coating, produced by the method according to the invention, comprising at least steps (A), (B), (C), (D) and (E).
  • the process according to the invention makes it possible to produce a flat steel product which, owing to the recrystallizing annealing according to the invention in step (C), has a particularly good surface condition in the deformed state under specially selected conditions. This is shown in particular by an advantageous ripple characteristic value SWg.
  • the present invention preferably relates to the flat steel product according to the invention, the coating protecting against corrosion not only containing Zn and unavoidable impurities, but also containing 0.1 to 2.0% by weight of Al and optionally 0.1 to 3% by weight of Mg.
  • the present invention further relates to a flat steel product provided with a protective coating against corrosion, the flat steel product having a carbon distribution according to the following formula (I)
  • f (x), x and k have the following meanings: f (x) relative amount of carbon, based on the original amount of carbon, at a normalized depth x, x normalized depth in the flat steel product, and
  • k less than 0.768 f (x) in formula (I) means the carbon content, based on the original carbon content, at a normalized depth x. If, for example, there is carbon in an amount of 50 ppm before the annealing step (C) at a standardized depth x, and after the annealing step (C) there is only 30 ppm of carbon in this standardized depth x, the relative would be Carbon amount f (x) 0.60 or 60%.
  • x in formula (I) means the normalized depth in the flat steel product. In the context of the present invention, “standardized depth in the flat steel product” means that the thickness of the flat steel product is first divided by two, and the value obtained in this way then forms the base value.
  • k is a unitless factor (k factor). According to the invention, k is less than 0.768, preferably less than or equal to 0.5, more preferably -0.5 to 0.7, particularly preferably -0.25 to 0.5.
  • the present invention also relates to the flat steel product according to the invention, the coating protecting against corrosion containing Zn and unavoidable impurities containing 0.1 to 2.0% by weight of AI and optionally 0.1 to 3% by weight of Mg.
  • the flat steel product according to the invention can be a hot strip or a cold strip.
  • a cold strip is preferred according to the invention.
  • the flat steel product can generally have all thicknesses known to the person skilled in the art, for example 0.2 to 1.2 mm, preferably 0.5 to 0.9 mm, in each case including the coating which protects against corrosion. If a steel strip is used according to the invention, it preferably has a width of 500 to 2500 mm, particularly preferably 800 to 2000 mm.
  • the steel present in the steel flat product according to the invention can generally have any composition.
  • the steel present in the flat steel product according to the invention preferably has a composition which enables a BFI2 value according to SEW094 of> 5 MPa.
  • a flat steel product is particularly preferably used, comprising a steel containing, in addition to Fe and unavoidable impurities (all data in% by weight)
  • the present invention also relates to the component produced by the method according to the invention, at least comprising steps (F) and (G).
  • the present invention preferably relates to the component according to the invention, it having a SWg value of at most 0.34, particularly preferably at most 0.33, very particularly preferably 0.25 to 0.34, in particular 0.25 to 0.33, in each case after reshaping.
  • the present invention also relates to the use of a flat steel product according to the invention or a component according to the invention in the automotive sector, in particular for commercial vehicles, in particular trucks, construction machinery and earth moving vehicles, in the industrial sector, for example as rails or telescopic rails, in the construction sector, for example as facade elements, for household appliances, in the energy sector , in shipbuilding.
  • Figures 1, 2 and 3 each show three-dimensional coordinate systems, in which the annealing temperature in ° C as the x value, the annealing time in s as the y value and the dew point in ° C as the z value.
  • FIG. 1 The particularly preferred space according to the invention is shown in FIG. 1
  • FIG. 1 A further space according to the invention is shown in FIG.
  • the entire space which results from the addition of the space according to FIG. 1 and the space according to FIG. 2, represents the space according to the invention.
  • FIG. 3 shows a space that is not preferred, according to the invention.
  • the strip is then galvanized on both sides in a hot-dip process (nominal coating weight per side 50 g / m 2 ) and treated with an EDT roller with a roller roughness Ra of 2.0 gm.
  • the C content of the annealed cold strip and the absolute decarburization are determined using GDOES. Furthermore, the SWg value was determined by a confocal white light microscope.
  • Coated flat steel products which are distinguished by a particularly high-quality surface structure can be obtained by the process according to the invention. These flat steel products can therefore be used advantageously in the automotive sector.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un produit plat en acier pourvu d'un revêtement anti-corrosion, un produit plat en acier correspondant, un élément obtenu par mis en forme à partir de ce produit plat en acier ainsi que leur utilisation dans le secteur automobile, en particulier pour les véhicules utilitaires, en particulier les camions, les engins de chantier et engins de terrassement, dans le secteur industriel, par exemple comme boîtiers ou glissières télescopiques, dans le secteur de la construction, par exemple comme éléments de façade, pour les appareils ménagers, dans le secteur de l'énergie, dans la construction navale.
PCT/EP2018/068091 2018-07-04 2018-07-04 Tôle fine à froid galvanisée possédant des propriétés de matériau homogènes WO2020007459A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/EP2018/068091 WO2020007459A1 (fr) 2018-07-04 2018-07-04 Tôle fine à froid galvanisée possédant des propriétés de matériau homogènes
EP19733645.6A EP3752652A1 (fr) 2018-07-04 2019-06-17 Tôle fine à froid galvanisée possédant des propriétés de matériau homogènes
PCT/EP2019/065793 WO2020007594A1 (fr) 2018-07-04 2019-06-17 Tôle fine à froid galvanisée possédant des propriétés de matériau homogènes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/068091 WO2020007459A1 (fr) 2018-07-04 2018-07-04 Tôle fine à froid galvanisée possédant des propriétés de matériau homogènes

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WO2020007459A1 true WO2020007459A1 (fr) 2020-01-09

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PCT/EP2018/068091 WO2020007459A1 (fr) 2018-07-04 2018-07-04 Tôle fine à froid galvanisée possédant des propriétés de matériau homogènes
PCT/EP2019/065793 WO2020007594A1 (fr) 2018-07-04 2019-06-17 Tôle fine à froid galvanisée possédant des propriétés de matériau homogènes

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