WO2022049003A1 - Procédé de fabrication d'un élément tôle par formage à chaud d'un produit plat en acier pourvu d'un revêtement anticorrosion - Google Patents

Procédé de fabrication d'un élément tôle par formage à chaud d'un produit plat en acier pourvu d'un revêtement anticorrosion Download PDF

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Publication number
WO2022049003A1
WO2022049003A1 PCT/EP2021/073759 EP2021073759W WO2022049003A1 WO 2022049003 A1 WO2022049003 A1 WO 2022049003A1 EP 2021073759 W EP2021073759 W EP 2021073759W WO 2022049003 A1 WO2022049003 A1 WO 2022049003A1
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WIPO (PCT)
Prior art keywords
flat
corrosion coating
product
steel
flat steel
Prior art date
Application number
PCT/EP2021/073759
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German (de)
English (en)
Inventor
Maria KÖYER
Manuela Ruthenberg
Janko Banik
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Thyssenkrupp Steel Europe Ag
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Publication date
Application filed by Thyssenkrupp Steel Europe Ag filed Critical Thyssenkrupp Steel Europe Ag
Priority to CN202180067892.5A priority Critical patent/CN116249793A/zh
Priority to US18/024,126 priority patent/US20230366056A1/en
Publication of WO2022049003A1 publication Critical patent/WO2022049003A1/fr

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    • 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
    • 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
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/34—Methods of heating
    • 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
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0436—Cold rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0478—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular surface treatment
    • 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
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates
    • 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
    • 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
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
    • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
    • C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
    • 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • 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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/12—Oxidising using elemental oxygen or ozone
    • C23C8/14—Oxidising of ferrous surfaces

Definitions

  • the invention relates to a method for producing a sheet metal component by hot forming a flat steel product, which is provided with an anti-corrosion coating in particular by hot-dip coating and which is given at least one section by flexible cold rolling, which has a different thickness than another section of the flat steel product adjoining it. the transition between the sections of the flat steel product having different thicknesses being abrupt.
  • Step flat products are understood here to mean rolled products whose length and width are each significantly greater than their thickness. These include, in particular, steel strips and steel sheets.
  • the anti-corrosion coating of the sheet consists of up to 13% by weight Si, 0.5 - 8% by weight Mg and, if necessary, one or more metals from the group "0.001 - 1% by weight Sr, 0.001 - 1 wt% Ca, 0.0001 - 0.1 wt% Be, 0.001 - 1 wt% Ba".
  • Sr 0.001 - 1% by weight
  • Mg metals from the group "0.001 - 1% by weight Sr, 0.001 - 1 wt% Ca, 0.0001 - 0.1 wt% Be, 0.001 - 1 wt% Ba".
  • EP 2 993248 A1 Another method is known from EP 2 993248 A1, in which flat steel products of the type in question are hot-formed.
  • a steel flat product is used as the starting product for this process, the steel substrate of which consists of so-called "MnB steel".
  • Steels of this type are standardized in DIN EN 10083-3 and have good hardenability. They allow safe process control during hot pressing, which makes it possible in an economical way to bring about martensite hardening in the tool without additional cooling during the course of hot forming.
  • a typical example of such a steel is the steel known under the designation 22MhB5, which can be found in the steel key 2004 under the material lobster 1.5528.
  • fully killed 22MnB5 steel available on the market contains, in addition to iron and unavoidable impurities, in % by weight, 0.10 - 0.250% C, 1.0 - 1.4% Mn, 0.35 - 0.4% Si, up to 0.03% P, up to 0.01% S, up to 0.040% Al, up to 0.15% Ti, up to 0.1% Nb, in total up to 0.5% Cr + Mo, and up to 0.005% B.
  • the steel flat products are coated according to the known method with an anti-corrosion coating on Al -Base which contains effective amounts of 0.005 - 0.7% by weight of at least one alkaline earth metal or transition metal as an additional alloying component.
  • Si contents of 3-15% by weight and Fe contents of up to 5% by weight can also be present in the coating.
  • Mg in contents of 0.1-0.5% by weight is preferably used as the at least one alkaline earth metal or transition metal of the protective coating, with calcium, strontium, sodium or barium also being possible as a substitute or in addition.
  • the Al-based protective coating can be applied to the steel substrate by hot-dip coating, also known as "hot-dip aluminizing" in technical jargon, or by a gas deposition process, e.g. the well-known PVD (physical vapor deposition) or CVD (chemical vapor deposition) process.
  • hot-dip coating also known as "hot-dip aluminizing” in technical jargon
  • gas deposition process e.g. the well-known PVD (physical vapor deposition) or CVD (chemical vapor deposition) process.
  • the height of the roll gap provided between two work rolls of a roll stand, through which the flat steel product to be rolled has to pass is usually varied during rolling. In this way, sections with greater thickness (wider roll gap) and less thickness (narrower roll gap) can be produced successively on the flat steel product over the length of the flat steel product.
  • flexible rolling is ideally suited for producing a steel flat product whose properties are adapted, for example, to the locally limited loads acting on it during use or to the requirements placed on its deformation behavior.
  • flexible rolling can be used to form flat steel products in such a way that a component obtained from such a flat steel product by forming has different sheet thicknesses at the required locations, which enable the component to withstand high loads while having a minimized weight.
  • the invention proposes that at least the process steps specified in claim 1 be completed during the flexible cold rolling of a flat steel product provided with an anti-corrosion coating.
  • a flat steel product which has a steel substrate which is produced from a steel which, in % by weight, consists of 0.07 - 0 .4% C, 1.0 - 2.5% Mn, 0.06 - 0.9% Si, up to 0.03% P, up to 0.01% S, up to 0.1% Al, up 0.15% Ti, up to 0.6% Nb, up to 0.005% B, up to 0.5% Cr, up to 0.5% Mo, the sum of the Cr and Mo contents not exceeding 0.5 %, the balance being iron and unavoidable impurities, and comprising an anti-corrosion coating applied to the steel substrate consisting of, in % by weight, up to 15% Si
  • a flat steel product which comprises an MnB steel substrate composed in a specific way and an Al-based anti-corrosion coating applied thereto, in particular by hot-dip coating.
  • hot-dip coating is carried out in a conventional manner for the purposes of the invention, the flat steel product is passed through a molten bath alloyed according to the invention and the coating layer thickness of the protective layer is adjusted from the flat steel product emerging from the molten bath by means of wiping nozzles. Air is used as the wiping medium.
  • the oxide layer on the anti-corrosion layer is "frozen", i.e. it cannot form according to the chemical equilibrium rules.
  • the anti-corrosion coating of the flat steel product contains at least one alkaline earth metal or transition metal or is wetted with a solution that contains at least one such alkaline earth metal or transition metal in step b), which is carried out if necessary.
  • the solution used for this purpose according to the invention is preferably an aqueous solution whose solvent “water” is easily mastered in terms of process technology and is harmless with regard to the environment.
  • Step b) is carried out when the anti-corrosion coating contains too little of the at least one alkaline earth metal or transition metal.
  • wetting with the aqueous solution containing the at least one alkaline earth metal or transition metal also take place as a supplementary measure if the anti-corrosion coating contains a fundamentally sufficient amount of alkaline earth metal or transition metal, but other amounts of the at least alkaline earth metal or transition metal are on the surface of the Anti-corrosion coating are to be applied in order to ensure the occurrence of the effect used according to the invention of the presence of these metals in or on the anti-corrosion layer.
  • the alkaline earth metals and transition metals applied in the anti-corrosion coating include in particular magnesium ("Mg”) and calcium (“Ca”), but also beryllium (“Be”), strontium (“Sr”) and barium (“Ba”).
  • the application of the solution containing the at least one alkaline earth metal or transition metal can take place before or after the flexible rolling. It is essential that, before heating to the hot forming temperature, there is a sufficient quantity of the respective alkaline earth metal or transition metal in or on the anti-corrosion coating.
  • step c) the steel flat product provided and optionally coated with the layer containing at least one alkaline earth metal or transition metal is flexibly cold-rolled at room temperature in a conventional manner in order to give it sections of different thicknesses.
  • the steel flat product is rolled with rolling degrees W, which are 0.1 to 80%.
  • a degree of rolling W of 48.64% is required to produce a second section with a thickness X2 of 2.5 mm a rolling degree W of 10.00%, to produce a third section with a thickness X3 of 2.15 mm a rolling degree W of 27.90% and to produce a fourth section with a thickness X4 of 2.25 mm requires a degree of rolling W of 22.22%.
  • Particularly practical rolling degrees W are 0.1 - 60%, in particular 0.1 - 50%.
  • the degree of rolling W specifically set in each case depends on the desired extent of reduction in the thickness of the flat steel product compared to the initial state.
  • the range specified here for the degree of rolling W thus only defines the limits within which the degree of rolling set in each case is set according to the invention.
  • the thickness of the steel flat product is specifically reduced in limited length sections. Due to the constant volume, this reduction in thickness is inevitably accompanied by an elongation of the flat steel product.
  • the aluminum alloy of the anti-corrosion coating on a flat steel product processed according to the invention is so ductile that it can follow the deformation of the flat steel product occurring in the longitudinal and thickness direction, even in the border areas where the sections of different thickness meet.
  • the protective oxide layer on the anti-corrosion coating is much more brittle, with the result that it locally cracks due to the deformation of the steel flat product.
  • the resulting cracks are quickly closed again by newly forming oxides. Since this process takes place in the ambient atmosphere and without separate temperature supply or removal, the new oxide layer can form in such a way that it corresponds to the chemical equilibrium at the location of the crack, taking into account the respective environmental conditions. Damage to the originally existing oxide layer that occurs during flexible rolling is caused by the During the course of the cold rolling, newly formed oxides are closed, so that the finished, flexibly rolled flat steel product has a densely closed oxide layer again. This is characterized by areas where the original oxide layer has remained and areas where a new oxide layer has been formed.
  • the surface of a flat steel product that has been flexibly hot-rolled according to the invention is 80-90% covered with the original oxide layer formed before the flexible rolling, while the remaining surface is covered with the oxide layer formed in the course of the flexible rolling itself new oxide layer is covered.
  • the ratio of the Si and Al contents in the oxide layer and the ratio of the Al, Si and Mg contents of the oxide layer also depend on the values set by flexible rolling Degree of rolling W.
  • the original oxide layer present on the flat steel product processed according to the invention before flexible cold rolling typically consists of silicon, magnesium and aluminum oxides, the proportion of Si being significantly smaller than the proportion of Mg, which in turn is smaller than the proportion of Al.
  • the oxide layer contains 10-40% C, 30-60% 0.4-30% Al, 0-5% Si and 1-20% of the at least one alkaline earth metal or transition metal, in particular mg, before
  • small proportions of Fe of up to 10 atom % can be present in the oxide layer. This applies in particular if the anti-corrosion coating has been applied by hot dip coating.
  • the thickness of the original oxide layer is typically 5-600 nm, in particular 5-300 nm, particularly preferably 5-150 nm.
  • the original oxide layer covers the surface of the anti-corrosion coating completely, ie 100%.
  • the oxide layer newly formed by the flexible cold rolling which can form in equilibrium, also essentially consists of oxides of silicon, magnesium and aluminum.
  • the quantity distribution of the Si, Mg and Al oxides corresponds to their distribution in the primary oxide layer.
  • the secondary oxide layer typically consists of, in atom %, 10 - 40 % C, 40-60% O, 20-30% Al, 0-5% Si and 1-20% of at least one alkaline earth metal or transition metal, in particular Mg, with small traces of iron of up to 10 atoms in the secondary oxide layer -% may be included.
  • the thickness of the secondary oxide layer is 1-100 nm, in particular 1-80 nm or 1-50 nm, with thicknesses of up to 30 nm having turned out to be particularly favorable.
  • the percentage area Fox of the secondary oxide layer in the total oxide layer covering the anti-corrosion coating of the steel flat product processed according to the invention after flexible cold rolling is related to the degree of rolling W, where F ox ⁇ W.
  • compositions of the oxide layers can be determined using X-ray photoelectron spectroscopy (XPS).
  • XPS X-ray photoelectron spectroscopy
  • the sample of the steel flat product to be examined, for which the composition and thickness are to be determined is degreased with n-heptane, rinsed with propanol and blown off in air.
  • the sample is then attached to a sample carrier, introduced into the measuring chamber of the X-ray photoelectron spectroscope and examined in a high vacuum.
  • the boiler pressure is typically less than 5x10 8 mbar.
  • Argon is typically used as the bombardment gas.
  • the radiation was excited as AI K with a bombardment voltage of 2 or 4 kV. At least one measurement regarding the composition and oxide layer thickness is carried out on each sample.
  • composition and thickness determined in this way of the oxide layer present on the circuit board examined is therefore also referred to as "average composition” or "average thickness”.
  • the steel flat product is heated to a hot forming temperature, if necessary from that previously
  • a hot forming temperature if necessary from that previously
  • at least one is separated, which is then further processed according to the invention as a steel flat product.
  • composition of the anti-corrosion coating selected according to the invention and/or the additional application of the alkaline earth metal or transition metal to the anti-corrosion coating by means of the aqueous solution ensures that a primary oxide layer formed from the at least one alkaline earth metal or transition metal is formed as a result of the heat treatment carried out before hot forming of the anti-corrosion coating.
  • the invention is based on the finding that on a steel flat product, which is provided with an aluminum-based (“Al-based”) anti-corrosion coating, which according to the invention is doped with at least one alkaline earth metal or transition metal, during the hot forming carried out heating on the anti-corrosion coating forms an oxide layer ("primary oxide layer"), which protects the underlying layers of the anti-corrosion coating and thus the steel substrate of the steel flat product against exposure to the ambient atmosphere.
  • the primary oxide layer in question is formed in such a way that it is in chemical equilibrium under the conditions prevailing during heating, in particular those determined by the respective hot-forming temperature. This process also continues during and after hot forming. Injuries to the oxide layer present before heating and hot forming are closed very quickly.
  • an oxide layer forms immediately as soon as the surface of the anti-corrosion layer is exposed to even the smallest amounts of oxygen.
  • the oxide layer present on the anti-corrosion coating covers the underlying aluminum of the anti-corrosion coating, so that contact of the Al with the ambient moisture and the associated elimination of larger amounts of hydrogen during heating to the hot-forming temperature or the hot forming itself can be prevented.
  • the penetration of relatively large amounts of hydrogen into the anti-corrosion coating and the steel substrate of a flat steel product processed according to the invention can thus be effectively suppressed.
  • the effects used by the invention occur particularly reliably when the alkaline earth metal or transition metal additionally present in the anti-corrosion coating or additionally applied to the anti-corrosion coating is magnesium ("Mg"), i.e. when Mg alone or in combination with others elements belonging to the group of alkaline earth metals or transition metals are present in the levels provided according to the invention in the anti-corrosion coating provided according to the invention of a flat steel product processed according to the invention or is additionally applied by means of the aqueous solution if the alkaline earth metal or transition metal content in the anti-corrosion coating is too low.
  • the method according to the invention is suitable for processing flat steel products with a wide range of thicknesses. With the method according to the invention, flat steel products can be processed with a thickness of 0.6-7 mm.
  • the flat steel product provided in step a) can be produced in any manner known from the prior art.
  • the method according to the invention is particularly suitable for processing flat steel products with a thickness of 0.8-4 mm, in particular 0.8-3 mm.
  • flat steel products can also be provided in step a), which are formed from a stack of metal sheets comprising, for example, three to five metal layers, which have been connected in a manner known per se, for example by roll cladding, to form a uniform flat steel product.
  • step a) for the method according to the invention in the manner of Taylored blanks from different sheet metal blanks welded to one another or similarly assembled flat steel products and steel strips, which are welded to one another and together form the flat steel product to be processed, can be provided for the process according to the invention.
  • the respective flat steel product provided according to the invention consists of a steel which has a composition typical of MnB steels. Such steels typically have yield strengths of 250 - 580 MPa and tensile strengths of 400 - 720 MPa in the as-delivered condition.
  • the steel substrate of which consists, in a manner known per se, of 0.07 - 0.4% by weight C, 1.0 - 2% by weight Mn, 0.06 - 0.4% by weight Si, up to 0. 03 wt% P, up to 0.01 wt% S, up to 0.1 wt% Al, up to 0.15 wt% Ti, up to 0.6 wt% Nb , up to 0.005% by weight B, up to 0.5% by weight Cr, up to 0.5% by weight Mo, the sum of the contents of Cr and Mo being at most 0.5% by weight , remainder iron and unavoidable impurities.
  • alkaline earth metal or transition metal must be added to the anti-corrosion coating.
  • the minimum required alkaline earth metal or transition metal content in the anti-corrosion coating is 0.1% by weight and can reach up to 5% by weight. Alkaline earth or transition metal contents of at least 0.11 wt permit. If the alkaline earth metal or transition metal content is more than 5% by weight, the Oxide layer and thus dust formation, which should be avoided. In order to avoid this consequence in a particularly reliable manner, the alkaline earth metal or transition metal content of the anti-corrosion coating applied in step a) can be limited to a total of at most 1.5% by weight, in particular at most 0.6% by weight.
  • alkaline earth metal or transition metal contents that are sufficiently effective for the purposes according to the invention are contained in the alloy of the anti-corrosion coating present on the steel substrate of a flat steel product processed according to the invention, these are therefore 0.1-5% by weight, in particular 0.11- 1.5% by weight or, especially, 0.11-0.6% by weight.
  • step b) The optional application of the solution containing the respective alkaline earth metal or transition metal (step b)) can take place directly after the application of the anti-corrosion layer inline by spraying and squeezing or by conventional coil coating.
  • salt solutions with up to 200 g/l are used for this purpose.
  • the alkaline earth metals or transition metals can be present as sulfates, phosphates and nitrates or in oxidic form as a dispersion of alkaline earth metal or transition metal oxide particles. Chlorides should not be used due to the potential for corrosive attack. Silicates can also find application. However, it should be noted here that these connections can impede further processing due to possible silicon connections. Fluorine compounds are not suitable because they can react to form hydrofluoric acid when heated to the hot forming temperature. Mixtures formed from compounds of the type discussed herein and/or different alkaline earth or transition metals can also be used.
  • the solution applied according to the invention, if necessary, to the surface of the anti-corrosion layer can additionally a network former such as bismuth nitrate and/or a wetting agent such as a surfactant.
  • drying A separate drying treatment ("baking") is not normally necessary.
  • the drying of the solution applied if necessary takes place by utilizing the process heat.
  • work step b) required according to the invention is to be carried out inline in a hot-dip coating system
  • the aqueous solution containing the at least one alkaline earth metal or transition metal can be applied at one point after the flat steel product has emerged from the molten bath and the coating thicknesses have been adjusted , at which the treated flat steel product is still warm enough for the solvent in the solution to evaporate quickly after contact with the surface of the flat steel product, i.e. the applied layer dries quickly.
  • the solution can also be applied in an additional process step on a conventional coil coating system.
  • a separate drying treatment can be useful if you want to ensure that the solution is dry before further processing. This applies in particular when water is used as the solvent.
  • either the flat steel product itself can be 100-250° C., in particular 100-180° C., warm when the at least one alkaline earth metal or transition metal-containing solution is applied, or it can be subjected to a drying treatment at these temperatures.
  • Typical drying times are 0-300 s, in particular 10-60 s. Drying times of "0 s" are achieved when the steel flat product or its surroundings are so hot when the solution is applied that the respective solvent when it hits the The surface of the anti-corrosion layer evaporates spontaneously, ie without waiting.
  • work step b) can also be carried out in the factory of the manufacturer of the flat steel product.
  • the flat steel product coated according to the invention is completely dry when it enters the furnace. Otherwise, the humidity brought into the oven by the water could lead to an excessive increase in the humidity of the oven atmosphere and thus to an unwanted Increase the dew point, which in turn would entail the risk of increased hydrogen absorption during the hot forming process.
  • the anti-corrosion coating of the flat steel product provided according to the invention can optionally contain silicon (“Si”) in amounts of up to 15% by weight, in particular up to 11% by weight, in order to reduce the formation of an iron-aluminum phase.
  • Fe can be present in the anti-corrosion coating provided on a flat steel product provided according to the invention in contents of up to 5% by weight, in particular up to 4% by weight, especially up to 3.5% by weight.
  • the Fe content is mainly due to the diffusion of Fe from the steel substrate and contributes to the optimal adhesion of the protective layer to the substrate.
  • Fe contents of at least 1 wt. 5% by weight the positive influences of the presence of Fe can be used particularly reliably in practice.
  • the anti-corrosion coating can be applied to the steel substrate of a flat steel product according to the invention in any known manner.
  • Hot-dip coating also known as “hot-dip aluminizing”
  • hot-dip aluminizing is particularly suitable for this purpose, in which the respective flat steel product is subjected to a suitably heated molten bath composed in accordance with the provisions of the invention with regard to the composition of the anti-corrosion coating is passed.
  • Such a hot-dip coating is particularly suitable for strip-shaped flat steel products with a thickness of up to 3 mm.
  • PVD, CVD vapor deposition processes
  • the application weight of an anti-corrosion coating present on a flat steel product processed according to the invention is typically 30-100 g/m 2 , in particular 40-80 g/m 2 , per side of the flat steel product.
  • Mg from the group of alkaline earth metals or transition metals has proven to be particularly suitable for the purposes according to the invention.
  • Mg can be present alone or in combination with other alkaline earth metals or transition metals, such as the elements beryllium, calcium, strontium and/or barium already mentioned, in the coating applied according to the invention in order to use the effects aimed at according to the invention.
  • step d) the flat steel product provided according to the invention is heated to a hot forming temperature of 800-1000° C., in particular 850-950° C., and is kept at this temperature until a sufficient amount of heat has been introduced into the flat steel product or a blank separated from it.
  • Hot forming temperatures of 850 - 930 °C have proven to be particularly favourable.
  • the specifically required holding time and annealing temperature can be estimated based on the proviso that the amount of heat energy Js introduced into the steel flat product or blank in step d) is more than 40,000 kJs and should be at most 400,000 kJs, where Js can be calculated according to the following well-known equation:
  • Js [kJs] [(T2-T1) x c x t x m] / 1000; with T2: Final temperature of the component at the end of heating in K T1: Start temperature of the component at the beginning of heating in K c: Heat capacity of steel (typically 460 J/kgK) t: Holding time of the steel flat product or blank at the final temperature in sm: Mass of steel flat product or blank in kg
  • the heating can be carried out in any suitable way. If a conventional continuous furnace is used for this purpose, in which the steel flat product or the blank is heated by radiant heat, the suitable holding time is typically 100-900 s, in particular 100-600 s or, particularly practical, 180-600 s If a hot forming temperature of 850 - 930 °C is selected, a holding time of 180 - 600 s is usually sufficient in practice.
  • a pre-alloying of the anti-corrosion layer can be carried out before hot forming in combination with heating to the hot forming temperature or as a separate treatment step.
  • the flat steel product can be kept at temperatures of 650-1100° C. for a period of 10-240 s, in particular 30-90 s.
  • the flat steel product heated in the manner according to the invention is fed within a transfer time customary in practice to a hot-forming device in which the flat steel product is hot-formed into the component (step e)).
  • Steel sheets each had a thickness D and were provided with an Al-based anti-corrosion coating in a conventional manner by hot-dip coating.
  • Five variants Z1 - Z5 of such an anti-corrosion coating were used, the compositions of which are given in Table 2.
  • Each of the anti-corrosion coatings Z1-Z5 contained the Mg content shown in Table 2 as the alkaline earth metal or transition metal added in accordance with the provisions of the invention.
  • the steel sheets AF each provided with one of the anti-corrosion coatings Z1-Z5 have been flexibly cold-rolled in a conventional manner, with a rolling degree W being achieved in each case by this cold-rolling.
  • the steel sheets A - F, each provided with one of the anti-corrosion coatings Z1 - Z5, were heated in a conventional continuous furnace to a hot forming temperature of 850 - 930 °C in each case, with the holding time at the respective hot forming temperature being varied so that a sufficient amount of energy EE has been introduced into the respective sheet.
  • the heating was carried out in two stages, in order to first bring about a pre-alloying of the anti-corrosion coating. All other tests V1 - V3, V5 and V7 - V9 were heated in one stage.
  • the sheet metal samples AF heated in this way to the respective hot forming temperature have been hot formed in a conventional manner in a tool provided for this purpose to form a sheet metal component.
  • the steel sheets obtained were cooled to room temperature at a cooling rate of 20-1000 K/s.
  • Table 3 shows the steel of the steel substrate of the steel sheet used in the tests V1 - V9, the respective coating applied to the steel sheet in question, the thickness D of the sheet metal samples examined, the coating weight of the coating before heating on the hot-forming temperature, the amount of heat introduced during heating to the hot-forming temperature and the degree of rolling W achieved via flexible cold rolling.
  • the percentage of area %OB of the newly formed oxide layer OB which was formed in the course of flexible cold rolling on the anti-corrosion coating of the steel sheet processed in each case, is determined by means of XPS analysis on the oxide layer densely covering the surface of the steel sheet overall been.
  • the thicknesses D_OA of the original oxide layers OA present before the flexible rolling, the thicknesses D_OB of the oxide layers OB newly formed via the flexible rolling and present after the flexible rolling, and the thickness D_OP present after the hot forming are the same as the XPS measurement during heating
  • the oxide layer formed on the hot forming temperature and present on the component obtained after hot forming has been determined.
  • the relevant measurement results are summarized in Table 4.
  • the compositions of the oxide layer present on the anti-corrosion coating before the flexible rolling, between the flexible rolling and heating to the hot forming temperature and the oxide layers present after the hot forming were also determined on samples A - F using XPS measurements.

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Abstract

L'invention permet, sans risque de pénétration de Ha, la fabrication d'un élément tôle à partir d'un produit plat en acier pourvu d'un revêtement anticorrosion, ledit élément tôle en acier présentant des sections de différentes épaisseurs, la transition entre les sections étant abrupte. A cet effet : a) on prend un produit plat en acier doté d'un substrat acier réalisé en acier, qui est constitué de, exprimé en % en poids, 0,07 - 0,4 % de C, 1,0 - 2,5 % de Mn, 0,06 - 0,9 % de Si, ≤ 0,03 % de P, ≤ 0,01 % de S, ≤ 0,1 % de AI, ≤ 0,15 % de Ti, ≤ 0,6 % de Nb, ≤ 0,005 % de B, ≤ 0,5 % de Cr, 50,5 % de Mo, la somme de Cr et Mo étant ≤ 0,5 %, le reste étant du Fe et les inévitables impuretés, et qui est pourvu d'un revêtement anticorrosion constitué de, exprimé en % en poids, ≤ 15 % de Si, ≤ 5 % de Fe, ≤ 5 % minimum d'un métal alcalinoterreux ou d'un métal de transition, le reste étant composé de AI et des inévitables impuretés. Si le revêtement anticorrosion contient 0,1 % en poids de métal alcalinoterreux ou métal de transition, b) une solution contenant au moins un métal alcalinoterreux ou métal de transition est appliquée sur le revêtement anticorrosion du produit plat en acier. Ensuite c) le produit plat en acier est laminé à froid de manière flexible pour obtenir les sections d'épaisseurs différentes. Ensuite on procède d) au chauffage à 800 - 1000 °C dans une atmosphère avec > 15 % en volume O2 jusqu'à ce qu'un volume d'énergie thermique Js > 44.000 kJs et s 400.000 kJs soit introduit. Ensuite le revêtement anticorrosion est recouvert d'une couche dense constituée d'un oxyde primaire de l'au moins un métal alcalinoterreux ou métal de transition. Enfin le produit plat en acier est soumis à un formage à chaud pour obtenir l'élément tôle.
PCT/EP2021/073759 2020-09-02 2021-08-27 Procédé de fabrication d'un élément tôle par formage à chaud d'un produit plat en acier pourvu d'un revêtement anticorrosion WO2022049003A1 (fr)

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US18/024,126 US20230366056A1 (en) 2020-09-02 2021-08-27 Method for Producing a Sheet Metal Component by Hot-Forming a Flat Steel Product Provided with an Anti-Corrosion Coating

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19846900A1 (de) 1998-10-12 2000-04-27 Thyssenkrupp Stahl Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes für abzulängende Tailored Blanks
DE10041280C2 (de) 2000-08-22 2003-03-06 Muhr & Bender Kg Verfahren und Vorrichtung zum flexiblen Walzen eines Metallbandes
JP2004083988A (ja) 2002-08-26 2004-03-18 Nisshin Steel Co Ltd 加工部耐酸化性に優れた耐熱用溶融Ａｌ基めっき鋼板加工材および耐高温酸化被覆構造
EP2993248A1 (fr) 2014-09-05 2016-03-09 ThyssenKrupp Steel Europe AG Produit plat en acier doté d'un revêtement Al, son procédé de fabrication, élément en acier et son procédé de fabrication
WO2019076720A1 (fr) * 2017-10-19 2019-04-25 Thyssenkrupp Steel Europe Ag Procédé de fabrication d'un élément en acier pourvu d'un revêtement métallique anticorrosion
DE102018118015A1 (de) * 2018-07-25 2020-01-30 Muhr Und Bender Kg Verfahren zur Herstellung eines gehärteten Stahlprodukts

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19846900A1 (de) 1998-10-12 2000-04-27 Thyssenkrupp Stahl Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes für abzulängende Tailored Blanks
DE10041280C2 (de) 2000-08-22 2003-03-06 Muhr & Bender Kg Verfahren und Vorrichtung zum flexiblen Walzen eines Metallbandes
JP2004083988A (ja) 2002-08-26 2004-03-18 Nisshin Steel Co Ltd 加工部耐酸化性に優れた耐熱用溶融Ａｌ基めっき鋼板加工材および耐高温酸化被覆構造
EP2993248A1 (fr) 2014-09-05 2016-03-09 ThyssenKrupp Steel Europe AG Produit plat en acier doté d'un revêtement Al, son procédé de fabrication, élément en acier et son procédé de fabrication
WO2019076720A1 (fr) * 2017-10-19 2019-04-25 Thyssenkrupp Steel Europe Ag Procédé de fabrication d'un élément en acier pourvu d'un revêtement métallique anticorrosion
DE102018118015A1 (de) * 2018-07-25 2020-01-30 Muhr Und Bender Kg Verfahren zur Herstellung eines gehärteten Stahlprodukts

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