US20230366056A1 - Method for Producing a Sheet Metal Component by Hot-Forming a Flat Steel Product Provided with an Anti-Corrosion Coating - Google Patents

Method for Producing a Sheet Metal Component by Hot-Forming a Flat Steel Product Provided with an Anti-Corrosion Coating Download PDF

Info

Publication number
US20230366056A1
US20230366056A1 US18/024,126 US202118024126A US2023366056A1 US 20230366056 A1 US20230366056 A1 US 20230366056A1 US 202118024126 A US202118024126 A US 202118024126A US 2023366056 A1 US2023366056 A1 US 2023366056A1
Authority
US
United States
Prior art keywords
flat steel
steel product
corrosion coating
alkaline earth
hot
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.)
Pending
Application number
US18/024,126
Other languages
English (en)
Inventor
Maria Köyer
Manuela Ruthenberg
Janko Banik
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 Europe 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 filed Critical ThyssenKrupp Steel Europe AG
Assigned to THYSSENKRUPP STEEL EUROPE AG reassignment THYSSENKRUPP STEEL EUROPE AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BANIK, JANKO, RUTHENBERG, MANUELA, KÖYER, Maria
Publication of US20230366056A1 publication Critical patent/US20230366056A1/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C23C2/04—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
    • C23C2/14—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 galvanizing, and which, by means of flexible cold rolling, is provided with at least one portion which has a different thickness than another adjoining portion of the flat steel product, wherein the transition between the portions of the flat steel product of different thicknesses takes place abruptly.
  • “Flat steel products” are understood here to be rolled products the length and width of which are each substantially greater than their thickness. These include in particular steel strips and steel sheets.
  • a method is known by means of which a component is formed from a hot-dip galvanized steel sheet which has an Al-based anti-corrosion coating and is intended for use at high temperatures of 450 to 650° C., which component should have improved oxidation resistance at the high operating temperatures.
  • the anti-corrosion coating of the sheet metal consists of up to 13 wt % Si, 0.5-8 wt % Mg and, if necessary, of one or more metals from the group “0.001-1 wt % Sr, 0.001-1 wt % Ca, 0.0001-0.1 wt % Be, 0.001-1 wt % Ba”.
  • an alloy layer is formed between the steel substrate and the anti-corrosion coating of the flat steel product.
  • the Mg present in the anti-corrosion coating causes Mg or Mg oxides to accumulate on the exposed surfaces of the coating in the region of cracks that arise in the anti-corrosion coating.
  • up to 50 vol. % iron oxides can be found in a transition layer between the anti-corrosion coating and the steel substrate.
  • EP 2 993 248 A1 discloses a further method in which flat steel products of the type discussed here are hot-formed.
  • the starting material used for this method is a flat steel product 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. In the case of hot pressing, they allow reliable process control, by means of which it is possible, in a commercially viable way, to achieve martensite hardening in the tool during the hot forming, without additional cooling.
  • a typical example of such a steel is the steel known as 22MnB5, which is to be found in the Key to Steel—Stahlischen everl 2004 under material number 1.5528.
  • fully killed 22MnB5 steel available on the market contains in wt. %, 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 flat steel products according to the known method are provided with an Al-based anti-corrosion coating, which contains, as an additional alloying component, effective contents of 0.005-0.7 wt % of at least one alkaline earth metal or transition metal.
  • an Si content of 3-15 wt % and Fe content of up to 5 wt % can also be present in the coating.
  • Mg is preferably used as the at least one alkaline earth metal or transition metal of the protective coating in a content of 0.1-0.5 wt.
  • the Al-based protective coating can be applied to the steel substrate by hot dip galvanizing, also called “hot dip aluminizing” in technical terminology, or by a gas separation method, for example the known PVD (physical vapor deposition) or CVD (chemical vapor deposition) methods.
  • “Flexible rolling” is a method for the production of metal strips with different strip thicknesses defined over their length.
  • the height of the roll gap provided between two work rolls of a roll stand, which gap the flat steel product to be rolled has to pass is usually varied during rolling for this purpose. In this way, consecutive sections having a greater thickness (wider roll gap) and smaller thickness (narrower roll gap) can be produced on the flat steel product over the length of the flat steel product.
  • the flexible rolling is ideally suited to producing a flat steel product the properties of which are adapted, for example, to the loads acting locally thereon during use or the requirements imposed on its deformation behavior.
  • flat steel products can be formed by flexible rolling in such a way that different sheet metal thicknesses are present at the required locations on a component obtained from such a flat steel product by reforming, said sheet thicknesses toughening the component with minimized weight to absorb high loads.
  • the object is to specify a method which makes it possible to flexibly hot-roll a flat steel product of the type explained above with high rolling degrees, without having to accept the risk of hydrogen penetrating the steel substrate.
  • the invention proposes that at least the method steps specified herein are completed during flexible cold rolling of a flat steel product provided with an anti-corrosion coating.
  • a sheet metal component by hot-forming a flat steel product which is provided with an anti-corrosion coating and which, by means of flexible cold rolling, is provided with at least one portion which has a different thickness than another adjoining portion of the flat steel product, wherein the transition between the portions of the flat steel product of different thicknesses is abrupt, the following steps are completed:
  • a flat steel product comprising a steel substrate produced from a steel which, in wt %, 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 to 0.15% Ti, up to 0.6% Nb, up to 0.005% B, up to 0.5% Cr, up to 0.5% Mo, wherein the sum of the content of Cr and Mo is at most 0.5%, and, as the remainder, of iron and unavoidable impurities, and comprising an anti-corrosion coating applied to the steel substrate, which coating is formed from, in wt %, up to 15% Si, up to 5% Fe, optionally up to 5 wt % of at least one alkaline earth metal or transition metal, and, as the remainder, from Al and unavoidable impurities, then
  • the anti-corrosion coating contains no or less than 0.1 wt % of the at least alkaline earth metal or transition metal: applying a solution containing at least one alkaline earth metal or transition metal to the anti-corrosion coating of the flat steel product,
  • step b) heating the flexibly cold-rolled flat steel product to a hot-forming temperature of 800-1000° C. in an atmosphere containing more than 15 vol. % oxygen, over a holding period which is sufficient to introduce a thermal energy quantity Js of more than 44,000 kJs and at most 400,000 kJs into the flat steel product, so that, after heating, the surface of the anti-corrosion coating of the flat steel product is densely coated with a layer consisting of a primary oxide of the at least one alkaline earth metal or transition metal contained in the anti-corrosion layer and/or optionally additionally applied in step b), then
  • a flat steel product which comprises an MnB steel substrate composed in a certain way and an Al-based anti-corrosion coating applied thereto, in particular by hot dip galvanizing.
  • hot dip galvanizing carried out in a conventional manner for purposes of the invention, the flat steel product is passed through a melt bath alloyed in accordance with the invention, and from the flat steel product emerging from the melt bath the thickness of the protective layer is adjusted by means of stripping nozzles. Air is used as the stripping medium. By applying the air jet and the resulting rapid temperature reduction, the oxide layer present on the anti-corrosion layer is “frozen”, i.e., it cannot develop in accordance with the chemical equilibrium rules.
  • the anti-corrosion coating of the flat steel product has a content of at least one alkaline earth metal or transition metal or, in step b), which is carried out if necessary, is wetted with a solution containing at least one such alkaline earth metal or transition metal.
  • the solution used for this purpose in accordance with the invention is preferably an aqueous solution whose “water” is simple in terms of process engineering and is harmless with respect to the environment.
  • Step b) is necessarily carried out if the anti-corrosion coating contains an excessively low content of the at least one alkaline earth metal or transition metal.
  • the wetting with the aqueous solution containing the at least one alkaline earth metal or transition metal can, of course, also take place as a supplementary measure if, although a basically sufficient amount of alkaline earth metal or transition metal is present in the anti-corrosion coating, further amounts of the at least one alkaline earth metal or transition metal are to be applied to the surface of the anti-corrosion coating in order to ensure the occurrence of the effect, which is used according to the invention, of the presence of these metals in or on the anti-corrosion layer.
  • the alkaline earth metal and transition metals alloyed to the anti-corrosion layer and/or applied to the surface of the anti-corrosion coating in the form of a solution for the purposes of the invention 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 which is carried out optionally necessarily or optionally additionally, can take place before or after the flexible rolling. It is essential that, prior to heating to the hot-forming temperature, a sufficient amount of the respective alkaline earth or transition metal is present in or on the anti-corrosion coating.
  • step c) the flat steel product provided and optionally coated with the layer containing the at least one alkaline earth metal or transition metal is flexibly cold-rolled in a conventional manner at room temperature in order to provide it with the portions of different thicknesses.
  • the flat steel product is rolled with rolling degrees W of 0.1 to 80%.
  • a rolling degree W of 48.64% is required to produce a first portion with a thickness X1 of 1.85 mm
  • a rolling degree W of 10.00% is required to produce a second portion with a thickness X2 of 2.5 mm
  • a rolling degree W of 27.90% is required to produce a third portion with a thickness X3 of 2.15 mm
  • a rolling degree W of 22.22% is required to produce a fourth portion with a thickness X4 of 2.25 mm.
  • Rolling degree W which are particularly suitable in practice are 0.1-60%, in particular 0.1-50%.
  • the flexible rolling reduces the thickness of the flat steel product in limited length portions in a targeted manner. Due to the constant volume, this decrease in thickness is inevitably accompanied by 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 this deformation of the flat steel product taking place in the longitudinal and thickness direction even in the boundary regions at which the portions of different thickness abut one another.
  • the protective oxide layer on the anti-corrosion coating is substantially more brittle with the result that it tears locally due to the deformation of the flat steel product.
  • the resulting cracks are rapidly closed again by means of newly forming oxides. Since this process takes place in an ambient atmosphere and without separate temperature supply or removal, the new oxide layer can form such that it corresponds to the chemical equilibrium at the location of the crack, taking into account the respective ambient conditions. Damage to the originally present oxide layer occurring during the flexible rolling is closed by new oxides which emerge in the course of the cold rolling, so that a tightly closed oxide layer is again present on the finished flexibly rolled flat steel product. This is characterized by regions in which the original oxide layer remained and regions in which a new oxide layer was formed.
  • the percentage area ratio B of the surface of the flat steel product B obtained after the flexible rolling, which is covered by the newly formed oxide is 100% ⁇ A ⁇ 5%.
  • the surface of a flat steel product which is 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 new oxide layer formed in the course of the flexible rolling.
  • % A/% Si ⁇ 6.4 ⁇ W ⁇ 0.1 applies to the total oxide layer present on the flat steel product after the flexible cold rolling
  • the original oxide layer present on the flat steel product processed according to the invention prior to the flexible cold rolling typically consists of silicon, magnesium and aluminum oxides, wherein the proportion of Si is substantially smaller than the proportion of Mg, which in turn is smaller than the proportion of Al.
  • typically present in the oxide layer, and given in atomic % are 10-40% C, 30-60% O, 4-30% Al, 0-5% Si and 1-20% of the at least one alkaline earth metal or transition metal, in particular Mg.
  • small proportions of Fe of up to 10 atomic % can be present in the oxide layer. This applies in particular when the anti-corrosion coating has been applied by hot dip galvanizing.
  • the thickness of the original oxide layer is typically 5-600 nm, in particular 5-300 nm, particularly preferably 5-150 nm. In this case, the original oxide layer covers the surface of the anti-corrosion coating completely, that is to say 100%.
  • the oxide layer which is newly formed via flexible cold rolling and which can form in equilibrium, likewise consists substantially of oxides of silicon, magnesium and aluminum.
  • the secondary oxide layer typically consists of, in atomic %, 10-40% C, 40-60% O, 20-30% AI, 0-5% Si and 1-20% of the at least one alkaline earth metal or transition metal, in particular Mg, wherein small traces of iron of up to 10 atomic % can also be contained in the secondary oxide layer.
  • the thicknesses of the secondary oxide layer are 1-100 nm, in particular 1-80 nm or 1-50 nm, wherein thicknesses of up to 30 nm have proven to be particularly favorable.
  • the percentage area ratio F ox of the secondary oxide layer on the overall oxide layer, which covers the anti-corrosion coating of the flat steel product processed according to the invention after flexible cold rolling, is related to the rolling degree W, wherein F ox ⁇
  • compositions of the oxide layers can be determined by means of X-ray photoelectron spectroscopy (XPS).
  • XPS X-ray photoelectron spectroscopy
  • the respective sample of the flat steel product to be investigated 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 in each case to a sample carrier, introduced into the measurement chamber of the X-ray photoelectron spectroscope and investigated in a high vacuum.
  • the tank pressure is typically less than 5 ⁇ 10 8 mbar.
  • Argon is typically used as the bombardment gas.
  • the radiation was excited as Al K with a bombardment voltage of 2 or 4 kV.
  • At least one measurement is carried out on each sample with respect to the composition and oxide layer thickness.
  • a plurality of samples of a blank are investigated and the results of all samples of the relevant blank are arithmetically averaged in each case.
  • the composition and thickness thus determined of the oxide layer present on the respectively investigated blank is therefore also referred to as “average composition” or “average thickness”.
  • the flat steel product is heated to a hot-forming temperature, wherein, if necessary, from the flat steel product present beforehand, for example in the form of a steel strip or larger metal sheet, at least one is partitioned off which is then further processed as a flat steel product according to the invention.
  • 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, as a result of the heat treatment carried out prior to the hot forming, a primary oxide layer formed from the at least one alkaline earth metal or transition metal is produced on the anti-corrosion coating.
  • the invention is based on the finding that, on a flat steel product which is provided with an aluminum-based (“Al-based”) anti-corrosion coating doped with at least one alkaline earth metal or transition metal according to the invention, during the heating carried out for hot forming an oxide layer (“primary oxide layer”) is formed on the anti-corrosion coating which protects the underlying layers of the anti-corrosion coating and thus the steel substrate of the flat steel 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 the heating and determined in particular by the respective hot-forming temperature. This process continues even during and after the hot forming. Any damage to the oxide layer present before heating and hot forming is thus closed very quickly.
  • the reactivity of the alkaline earth metals or transition metals provided in accordance with the invention in and/or on the anti-corrosion layer guarantees that the oxides of the newly formed oxide layer are produced within such a short time that penetration of harmful substances from the surroundings is reliably prevented.
  • 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, consequently, a separation of a larger quantity of hydrogen during the heating to the hot-forming temperature or the hot forming itself, is prevented.
  • the penetration of larger 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 utilized by the invention occur particularly reliably when the alkaline earth metal or transition metal which is additionally present in the anti-corrosion coating or additionally applied to the anti-corrosion coating, is magnesium (“Mg”), i.e., if Mg alone or in combination with further elements belonging to the group of alkaline earth metals or transition metals is present in the contents 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 when the content of alkaline earth metal or transition metal in the anti-corrosion coating is too small.
  • Mg magnesium
  • the method according to the invention is suitable for processing flat steel products with a large thickness spectrum.
  • flat steel products whose thickness is 0.6-7 mm can be processed with the method according to the invention.
  • the production of the flat steel product provided in step a) in each case can be carried out in any manner known from the prior art.
  • the method according to the invention is thus suitable in particular for processing flat steel products having a thickness of 0.8 to 4 mm, in particular 0.8 to 3 mm.
  • flat steel products can also be provided in step a) which are formed from a stack of sheet metal comprising three to five sheet metal layers, for example, which have been joined to form a uniform flat steel product in a manner known per se, for example in the manner of roll cladding.
  • step a) for the method according to the invention flat steel products and steel strips composed from different sheet metal blanks welded together or the like in the manner of tailored blanks, which flat steel products and steel strips are welded together and together form the flat steel product to be processed, can be provided for the process according to the invention.
  • the flat steel product provided according to the invention consists of a steel which has a composition typical for MnB steels. Steels of this kind typically have yield limits in the delivered condition of 250-580 MPa and tensile strengths of 400-720 MPa.
  • Such composite steels achieve tensile strengths of up to 2000 MPa after the hot forming and cooling.
  • the prerequisite for the effects achieved according to the invention is the presence of at least one alkaline earth metal or transition metal in or on the Al-based anti-corrosion coating provided according to the invention.
  • a sufficient amount of alkaline earth metal or transition metal can be alloyed to the anti-corrosion coating.
  • the minimum contents of alkaline earth metal or transition metal required for this purpose in the anti-corrosion coating are 0.1 wt % and can range up to 5 wt %.
  • alkaline earth or transition metal contents of the anti-corrosion coating of at least 0.11 wt % have proven to be particularly favorable with regard to the reliability with which the positive effects of the presence of the at least one alkaline earth metal or transition metal in the coating applied according to the invention can be utilized.
  • the content of alkaline earth metal or transition metal in the anti-corrosion coating applied in step a) can be limited in total to at most 1.5 wt %, in particular at most 0.6 wt %.
  • sufficiently effective alkaline earth metal contents or transition metal contents 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, they are thus 0.1-5 wt. %, in particular 0.11-1.5 wt. % or, especially, 0.11-0.6 wt. %.
  • step b) The optional application of the solution containing the respective alkaline earth metal or transition metal (step b)) can be carried out directly after the application of the anti-corrosion layer by means of spraying and squeezing or also by conventional coil coating.
  • salt solutions with up to 200 g/l are used in practice.
  • the alkaline earth metals or transition metals can be present as sulfates, phosphates and nitrates or in oxide form as a dispersion of alkaline earth metal or transition metal oxide particles.
  • Chloride should not be used due to the possibility of corrosive attack.
  • Silicates can also be used. However, it should be noted here that these compounds can impede the further processing due to possible silicon bonding. Fluorine compounds are not suitable since they can react to form hydrofluoric acid when heated to the hot-forming temperature. It is also possible to use mixtures formed from compounds of the type described here and/or different alkaline earth metals or transition metals.
  • the solution applied according to the invention to the surface of the anti-corrosion layer can additionally contain a network former, such as bismuth nitrate, and/or a wetting agent, such as a surfactant.
  • a network former such as bismuth nitrate
  • a wetting agent such as a surfactant
  • drying A separately performed drying treatment (“baking”) is normally not necessary.
  • step b) provided according to the invention is to be carried out inline in a plant for hot dip galvanizing, the application of the aqueous solution containing the at least one alkaline earth metal or transition metal can take place after the flat steel product has left the melt bath and the coating thicknesses have been set at a point at which the flat steel product treated in each case is still warm enough for the solvent of the solution to evaporate rapidly 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 method step, on a conventional coil coating system.
  • a separate drying treatment can be expedient if it is to be ensured that the solution is dried before further processing. This is particularly true when water is used as solvent.
  • either the flat steel product itself can be 100-250° C., in particular 100-180° C. warm when the solution containing the at least one alkaline earth metal or transition metal is being applied, or it can be subjected to a drying treatment at these temperatures.
  • Typical drying times here are 0-300 s, in particular 10-60 s. Drying times of “0 s” are achieved when the flat steel product or its surroundings are so hot when the solution is applied that the respective solvent evaporates spontaneously, i.e., without a waiting time, when hitting the surface of the anti-corrosion layer.
  • step b) can also be carried out in the factory of the manufacturer of the flat steel product.
  • the solution containing the at least one alkaline earth metal or transition metal directly before the flat steel product enters the furnace provided for heating to the hot-forming temperature.
  • care should be taken to ensure that no solvent, in particular no water, enters the furnace.
  • the flat steel product coated according to the invention is completely dry when it enters the furnace. Otherwise, the moisture introduced into the furnace by the water could lead to a sharp increase in the moisture of the furnace atmosphere and thus to an undesired increase in dew point, which in turn would bring about the risk of increased hydrogen absorption via the hot forming process.
  • silicon in contents of up to 15 wt %, in particular up to 11 wt %, can be present in the anti-corrosion coating of the flat steel product provided according to the invention in order to reduce the formation of an iron-aluminum phase.
  • Si contents of at least 3 wt %, in particular at least 8.5 wt % prove to be particularly favorable, so that in the case of Si contents of 3-15 wt %, in particular 3-11 wt %, especially 8.5-11 wt %, the positive influences of Si can be utilized particularly reliably in practice.
  • contents of at least 3 wt % of Si it is ensured that the alloy layer between the steel substrate and the anti-corrosion layer of a flat steel product according to the invention does not become too thick and optimal further processing properties are maintained.
  • Fe can be present in the anti-corrosion coating provided on a steel flat product according to the invention in contents of up to 5 wt %, in particular up to 4 wt %, especially up to 3.5 wt %.
  • the Fe content is substantially achieved by diffusion of Fe from the steel substrate and contributes to optimal adhesion of the protective layer on the substrate.
  • Fe contents of at least 1 wt % prove to be particularly favorable, so that, in the case of Fe contents of 1-5 wt %, in particular 1-4 wt %, especially 1-3.5 wt %, the positive influences of the presence of Fe can be utilized 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 galvanizing also called “hot dip aluminizing”
  • Such hot dip galvanizing is particularly suitable for strip-shaped flat steel products having a thickness of up to 3 mm. With larger thicknesses, it is also possible to use one of the above-mentioned vapor deposition methods (PVD, CVD) in order to apply the anti-corrosion coating.
  • the coating 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.
  • the group of alkaline earth metals or transition metals, particularly Mg has proven particularly suitable for the purposes of 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, which are also mentioned above, in the coating applied according to the invention, in order to utilize the effects intended by the invention.
  • the flat steel product provided according to the invention is heated in step d) to a hot-forming temperature of 800-1000° C., in particular 850-950° C., and kept at this temperature until a sufficient amount of heat is introduced into the flat steel product or a blank separated therefrom.
  • Hot-forming temperatures of 850-930° C. have been found to be particularly favorable in this case.
  • the holding period and annealing temperature specifically required in each case can be estimated based on the requirement that the amount of heat energy Js introduced into the flat steel product or the blank in step d) should be more than 40,000 kJs and at most 400,000 kJs, wherein Js can be calculated according to the following known equation:
  • Js[kJs ] [( T 2 ⁇ T 1) ⁇ c ⁇ t ⁇ m]/ 1000;
  • Heating can be performed in any suitable manner.
  • the suitable holding period is typically 100-900 s, in particular 100-600 s or, in a particularly practical manner, 180-600 s.
  • a hot-forming temperature of 850-930° C. is selected, holding periods of 180-600 s generally prove to be sufficient in practice.
  • pre-alloying of the anti-corrosion layer can be carried out before the hot forming in combination with the 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 duration 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 that is customary in practice, to a hot-forming apparatus in which the flat steel product is hot-formed to form the component (step e)).
  • each of the anti-corrosion coatings Z1-Z5 contained the Mg content reported in Table 2.
  • the steel sheets A-F provided with one of the anti-corrosion coatings Z1-Z5 in each case were flexibly cold-rolled in a conventional manner, wherein a rolling degree W was achieved in each case via this cold rolling.
  • the steel sheets A-F provided with one of the anti-corrosion coatings Z1-Z5 in each case were heated in a conventional continuous furnace to a hot-forming temperature of 850-930° C., wherein the holding period at the respective hot-forming temperature was varied such that a sufficient amount of energy EE was introduced into the respective sheet.
  • the heating was carried out in two stages in order to initially bring about pre-alloying of the anti-corrosion coating.
  • heating was carried out in a single stage.
  • the sheet-metal samples A-F heated to the respective hot-forming temperature in this way were 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 gives the steel of the steel substrate of the sheet steel used in tests V1-V9 in each case, the coating applied to the respective steel sheet in each case, the thickness D of the examined sheet-metal samples, the coating weight of the coating before heating to the hot-forming temperature, the amount of heat introduced during heating to the hot-forming temperature and the rolling degree W achieved via the flexible cold-rolling.
  • the area ratio % OB of the newly formed oxide layer OB which was produced on the anti-corrosion coating of the steel sheet processed in each case during the flexible cold rolling, was determined by means of XPS analysis on the oxide layer densely coating the surface of the steel sheet.
  • 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 by the flexible rolling and present after the flexible rolling, and the thickness D_OP, present after the hot forming, of the oxide layer formed during the heating to the hot-forming temperature and present after the hot forming on the component obtained in each case were determined by XPS measurement in each case. The relevant measurement results are summarized in Table 4.
  • compositions of the oxide layer present on the anti-corrosion coating prior to the flexible rolling, between the flexible rolling and the heating to the hot-forming temperature and after the hot forming were determined for samples A-F by XPS measurement in each case.
  • Composition of the oxide layer Increase in between flexible rolling and diffusible Composition of the oxide layer heating to the hot-forming Composition of the oxide layer hydrogen before flexible rolling temperature after hot forming Diffusible O Al Si Mg C O Al Si Mg C O Al Si Mg C hydrogen Test [Atomic %] [Atomic %] [ppm] C1 35 18.40 4 5 Remainder 35 21 4.5 4.0 Remainder 49 28 8.0 1.0 Remainder 0.22 V2 38 16.10 3.5 4 38 25 4.9 4.7 50 26 9.0 0.5 0.28 V3 45 12.00 2.7 3 45 23 4.8 4.5 51 25 8.5 2.0 0.27 V4 55 14.50 3.1 4 55 29 6.0 6.2 45 30 10.0 1.0 0.21 V5 54 17.90 4.1 4 54 27 4.7 5.4 44 31 10.0 1.0 0.31 V6 37 7.50 1.5 2 37 28 4.9 5.8 51 27 8.0 1.5 0.24 V7 41 14.80 3.3 4 41 29 5.0 5.1 49 28 8.0 0.5 0.31 V8
US18/024,126 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 Pending US20230366056A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP20194103.6A EP3964602A1 (de) 2020-09-02 2020-09-02 Verfahren zum herstellen eines blechbauteils durch warmumformen eines mit einer korrosionsschutzbeschichtung versehenen stahlflachprodukts
EP20194103.6 2020-09-02
PCT/EP2021/073759 WO2022049003A1 (de) 2020-09-02 2021-08-27 Verfahren zum herstellen eines blechbauteils durch warmumformen eines mit einer korrosionsschutzbeschichtung versehenen stahlflachprodukts

Publications (1)

Publication Number Publication Date
US20230366056A1 true US20230366056A1 (en) 2023-11-16

Family

ID=72340287

Family Applications (1)

Application Number Title Priority Date Filing Date
US18/024,126 Pending 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

Country Status (4)

Country Link
US (1) US20230366056A1 (de)
EP (1) EP3964602A1 (de)
CN (1) CN116249793A (de)
WO (1) WO2022049003A1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19846900C2 (de) 1998-10-12 2000-08-10 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
EP2993248B1 (de) 2014-09-05 2020-06-24 ThyssenKrupp Steel Europe AG Stahlflachprodukt mit einer Al-Beschichtung, Verfahren zu seiner Herstellung, und Verfahren zur Herstellung eines warmgeformten Bauteils
DE102017218704A1 (de) * 2017-10-19 2019-04-25 Thyssenkrupp Ag Verfahren zur Herstellung eines mit einem metallischen, vor Korrosion schützenden Überzug versehenen Stahlbauteils
DE102018118015A1 (de) * 2018-07-25 2020-01-30 Muhr Und Bender Kg Verfahren zur Herstellung eines gehärteten Stahlprodukts

Also Published As

Publication number Publication date
WO2022049003A1 (de) 2022-03-10
CN116249793A (zh) 2023-06-09
EP3964602A1 (de) 2022-03-09

Similar Documents

Publication Publication Date Title
CN110352260B (zh) 用于制备热成形的涂覆的钢产物的方法
CN106795613B (zh) 具有Al涂层的扁钢产品及其制造方法和钢部件及其制造方法
JP5390104B2 (ja) 鋼ストリップをコーティングする方法及び前記コーティングを付与された鋼ストリップ
JP4119804B2 (ja) 密着性の優れた高強度合金化溶融亜鉛めっき鋼板及びその製造方法
US20220042155A1 (en) High-strength galvanized steel sheet having excellent electrical resistance spot weldability, and method for producing same
US20080053580A1 (en) Method for Production of Sheet of Austenitic Iron/Carbon/Manganese Steel and Sheets Produced Thus
RU2472868C2 (ru) Сталь для высокопрочных деталей из лент, листов или труб с превосходной деформируемостью и особо пригодная для способов высокотемпературного нанесения покрытий
EP2980245B1 (de) Hochfestes legiertes verzinktes stahlblech und verfahren zur herstellung davon
US10927441B2 (en) High-strength galvanized hot-rolled steel sheet and method for manufacturing same
EP3418417B1 (de) Hochfestes kaltgewalztes stahlblech
EP3409808B1 (de) Hochfestes verzinktes stahlblech mit hohem streckgrenzenverhältnis und verfahren zur herstellung davon
EP3715493A1 (de) Hochfestes stahlblech und verfahren zur herstellung davon
JP2003096541A (ja) 強度延性バランス、めっき密着性と耐食性に優れた高張力溶融亜鉛めっき鋼板および高張力合金化溶融亜鉛めっき鋼板
EP2740813B1 (de) Feuerverzinktes stahlblech und herstellungsverfahren dafür
US11920243B2 (en) Method for manufacturing a sheet metal component from a flat steel product provided with a corrosion protection coating
JP7006774B2 (ja) ジルコニウム系化成処理用冷延鋼板およびその製造方法ならびにジルコニウム系化成処理鋼板およびその製造方法
EP2759617B1 (de) Legiertes feuerverzinktes stahlblech mit hervorragender korrosionsbeständigkeit nach dem beschichten
US20230366056A1 (en) Method for Producing a Sheet Metal Component by Hot-Forming a Flat Steel Product Provided with an Anti-Corrosion Coating
US11643702B2 (en) High-strength hot-dip galvannealed steel sheet and method for producing same
US20230024115A1 (en) Advanced high strength zinc plated steel sheet having excellent surface quality and electrical resistance spot weldability and manufacturing method thereof
US20240133014A1 (en) Method for Manufacturing a Sheet Metal Component from a Flat Steel Product Provided With a Corrosion Protection Coating
EP4265805A1 (de) Hochfestes feuerverzinktes stahlblech mit hervorragender oberflächenqualität und punktschweissbarkeit sowie herstellungsverfahren dafür
EP4265806A1 (de) Hochfestes feuerverzinktes stahlblech mit hervorragender oberflächenqualität und punktschweissbarkeit sowie herstellungsverfahren dafür
TW202208640A (zh) 表面處理鋼板以及表面處理鋼板的加工方法

Legal Events

Date Code Title Description
STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

AS Assignment

Owner name: THYSSENKRUPP STEEL EUROPE AG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KOEYER, MARIA;RUTHENBERG, MANUELA;BANIK, JANKO;SIGNING DATES FROM 20230622 TO 20230720;REEL/FRAME:064898/0954