EP2580358A1 - Procédé de fabrication d'un élément en acier thermoformé et durci, recouvert d'un revêtement métallique anticorrosion, à partir d'un produit plat en acier - Google Patents

Procédé de fabrication d'un élément en acier thermoformé et durci, recouvert d'un revêtement métallique anticorrosion, à partir d'un produit plat en acier

Info

Publication number
EP2580358A1
EP2580358A1 EP11724650.4A EP11724650A EP2580358A1 EP 2580358 A1 EP2580358 A1 EP 2580358A1 EP 11724650 A EP11724650 A EP 11724650A EP 2580358 A1 EP2580358 A1 EP 2580358A1
Authority
EP
European Patent Office
Prior art keywords
steel product
flat steel
coating
annealing
layer
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.)
Withdrawn
Application number
EP11724650.4A
Other languages
German (de)
English (en)
Inventor
Martin Norden
Jens Kondratiuk
Manfred Meurer
Patrick Kuhn
Volker Marx
Horst Berndsen
Frank Friedel
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
Publication of EP2580358A1 publication Critical patent/EP2580358A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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
    • C21D8/0447—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 heat treatment
    • C21D8/0457—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 heat treatment with diffusion of elements, e.g. decarburising, nitriding
    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • 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
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—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
    • 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
    • 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
    • C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
    • 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
    • C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
    • C23C28/3225—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only with at least one zinc-based 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
    • 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
    • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
    • 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
    • C23C28/36—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including layers graded in composition or physical properties

Definitions

  • the invention relates to a method for producing a hot-formed and hardened, coated with a metallic Korrosionsschut zbe slaughterung steel component made of a flat steel product having an Mn content of at least 0.4 wt .-%.
  • a steel comparable to steel 22MnB5 is known from JP 2006104526A.
  • This known steel contains besides Fe and unavoidable impurities (in% by weight) 0.05 - 0, 55% C, max. 2% Si, 0.1-3% Mn, max. 0.1% P and max. 0.03% S.
  • additional contents of 0.0002 - 0.005% B and 0.001 - 0.1% Ti can be added to the steel.
  • the respective Ti content serves for setting the nitrogen present in the steel. In this way, the boron present in the steel can develop its strength-increasing effect as completely as possible.
  • Corrosion protection coating are provided.
  • a special difficulty is the hot forming of galvanized flat steel products to high- or high-strength steel components.
  • Liquid metal embrittlement in flat steel products made of higher strength and high strength Mn containing steels have only a limited ductility and, as a result, tend during their deformation to form near-surface, near the grain boundary cracks.
  • Nitriding treatment can be generated to the
  • Flat-rolled steel is typically more than
  • Examples of the steels processed according to the invention can be adjusted to their respective properties up to 0.2 wt .-% Ti, up to 0.005 wt .-% B, up to 0.5 wt% Cr, up to 0.1 wt. -% V or up to 0.03 wt .-% Nb included.
  • Nitrous oxide or internal nitriding requires the presence of diffusible nitrogen. This condition is met when the nitrogen is present in the statu nascendi.
  • the nitriding is carried out by annealing the respective flat steel product in an ammonia-containing H 2 -N 2 Glühgasatmospreheat.
  • ammonia and Nitrogen as a nitrogen donor available.
  • Ammonia gas splits at atmospheric pressure and
  • the object of the invention was to provide a method which minimizes it
  • coated steel component is based on the idea of performing a nitriding treatment on the flat steel product prior to its hot forming, in which W
  • Metal material of the coating counteracts. Moreover, an unusually high iron diffusion sets in the coating. As a result, especially in the processing of zinc based coatings, the
  • the method according to the invention comprises the following working steps:
  • Such a flat steel product may be in the hot or cold rolled state in processed according to the invention. It is also possible to make different steel blanks
  • the flat steel product is heated in a continuous furnace under an annealing atmosphere containing up to 25% by volume of H 2 ,
  • Liquid metal embrittlement prone temperature range so it can be postponed that this does not coincide with the typical temperature range for hot forming.
  • the board can optionally be preformed.
  • the preforming can go so far that after preforming the shape of the board corresponds approximately completely to the shape of the finished component. Typically, preforming occurs at cold or below the austenitizing temperature
  • thermoforming alone, preforming is eliminated.
  • the board is on a
  • Austenitizing temperature is accelerated cooled.
  • the cooling of the steel component is carried out such that forms in the flat steel product hardness structure.
  • Hot forming and hardening can be carried out "in one step". In this case, the thermoforming and the curing are performed in one go together in a tool.
  • the inventive method is characterized in particular by the fact that it can be carried out in a particularly economical manner using a continuous furnace. This makes it possible to use the method according to the invention in
  • Anticorrosive coating are hot-dip coated.
  • Iron surfaces present in the reaction space catalyze the dissociation. Some of the nitrogen atoms liberated at the moment of decomposition can diffuse into the iron material.
  • the NH 3 content of the annealing atmosphere is at most 5% by volume
  • the dew point of the annealing atmosphere is -40 ° C to
  • the holding temperature of the annealing is 680-840 ° C
  • the holding time of the annealing is 30 - 120 s.
  • a nitrided boundary layer is deliberately adjusted. The thickness of these fine-structured, if necessary only
  • nitriding layer is determined by the determined according to DIN 50190-3 Nitrierhärtiefe.
  • the nitriding hardness depth is the distance from the surface to the point of the steel substrate where the hardness of the core hardness is + 50HV. In this way turns in the nitrided, near-surface
  • Core area i. Hv (nitrided) / Hv (core area) 1.25.
  • Coating of the flat steel product with the metallic protective layer by a hot dip coating is carried out in a continuous on the annealing treatment - -
  • the annealing treatment carried out according to the invention takes place simultaneously with the surface conditioning for the downstream surface finishing via a heterogeneous annealing gas-metal reaction.
  • the annealing treatment in this case can include the edge nitriding, surface conditioning and recrystallization of the base material and then the
  • Procedure can be performed in-line following the annealing treatment. It is conceivable in principle, the traversed by the flat steel product
  • Oven line to flood over its entire length with NH 3 -containing gas.
  • Fire coating carried out an oxidation of the surface of the flat steel product.
  • surface refinement preferably carried out by hot-dip coating, of a
  • produced flat steel product can be applied to the steel substrate per se known coating systems which on Zn, Al, Zn-Al, Zn-Mg, Zn-Ni, Zn-Fe, Al-Mg, Al-Si, Zn-Al-Mg or Zn-Al-Mg-Si are based.
  • further heat treatment steps can be carried out in order to emboss the metallic protective coating in a specific way. If necessary, continuous annealing after hot dip coating, e.g. a galvanic treatment.
  • a flat steel product on which a fine-structured nitriding layer has been formed in a continuous annealing according to the invention can be given a metallic, a metallic-inorganic or a metallic-organic coating by applying it electrolytically, e.g. coated with a Zn, a ZnNi or a ZnFe coating, by PVD or CVD deposition or by another metal-organic or metal-inorganic coating process.
  • the annealing treatment according to the invention can be carried out in a conventional manner
  • the nitriding layer produced according to the invention makes it possible to easily heat the flat steel product according to the invention to an austenitizing temperature at which the flat steel product is largely complete
  • Melting temperature is less than or equal to
  • Heating temperature is.
  • the fine graininess of the surface layer achieved by the nitriding according to the invention prevents cracking and thus ensures that no metal of the coating penetrates into the core region or
  • Base material of the steel substrate can penetrate.
  • Fe / coating metal ratio advantageous Coating training the formation of solder cracks and thus counteracts liquid metal embrittlement.
  • the invention is based on
  • FIG. 1 shows a vertical section of a nitriding-annealed steel sample according to the invention
  • FIG. 2 shows a vertical section of a non-annealed, hard-rolling comparative sample
  • FIG. 4 shows a vertical section of the tensile zone region of a steel component formed from the steel sample according to FIG. 1;
  • FIG. 5 shows a vertical section of the tensile zone region of a steel component formed from the hard steel sample according to FIG. 2.
  • Hot-dip galvanizing is performed.
  • FIG. 1 shows the micrograph of the sample produced from the steel WU and heat-treated according to the invention. It can be clearly seen that as a result of the procedure according to the invention
  • ⁇ Nitriding layer "N" has been set.
  • Nitriding layer (Fig. 2).
  • GDOES Glow Discharge Optical Emission Spectrometer
  • treated sample represents.
  • FIG. 3 clearly shows that the sample treated according to the invention has a pronounced embroidered
  • Nitriding N whose thickness is about 20 ⁇ .
  • Nitriding region N has a microhardness of 340 HV and the non-nitrided core region (base material) K has a hardness of 180 HV.
  • Austenitizing temperature of 880 ° C Maschinenmint and then thermoformed in a hot press forming tool to a component for an automobile body.
  • thermoforming After thermoforming, the components obtained have been cooled in a manner known per se so fast that hardened structure has formed.
  • FIGS. 4 and 5 make it clear that no cracking has occurred in the region of the tensile zone in the component produced in accordance with the invention, while in the component produced in a conventional manner distinct intergranular crack formation
  • the inventive method thus improves the forming properties of surface-refined

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Abstract

La présente invention concerne un procédé de fabrication d'un élément en acier recouvert d'un revêtement protecteur métallique à partir d'un produit plat en acier comprenant 0,4 % en poids de Mn. L'objet de l'invention est de produire de façon économique un élément en acier extrêmement résistant tout en réduisant au minimum le risque de formation de fissures induites par le métal. A cet effet, le produit plat en acier est recuit dans un four continu dans une atmosphère de recuit contenant 25 % en volume de H2, 0,1 à 10 % en volume de NH3, H20 et le reste étant N2 ainsi que des impuretés techniquement inévitables et présentant un point de rosée situé entre -50 °C et -5 °C, à une température de maintien comprise entre 400 et 1100 °C pendant un temps de maintien compris entre 5 et 600 s. Le produit plat en acier recuit comprend une couche de nitrure (N) d'une épaisseur comprise entre 5 et 200 pm (N) dont la taille de particule est plus fine que celle de la couche de noyau intérieure (K) du produit plat en acier. Une fois la couche de protection métallique appliquée, un flan réchauffé après un préformage optionnel à une température d'austénitisation comprise entre 780 et 950 °C est séparé du produit plat en acier recuit, façonné à chaud pour obtenir l'élément en acier et refroidi rapidement de sorte qu'une structure de trempe se forme dans le produit plat en acier.
EP11724650.4A 2010-06-14 2011-06-14 Procédé de fabrication d'un élément en acier thermoformé et durci, recouvert d'un revêtement métallique anticorrosion, à partir d'un produit plat en acier Withdrawn EP2580358A1 (fr)

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DE102010017354A DE102010017354A1 (de) 2010-06-14 2010-06-14 Verfahren zum Herstellen eines warmgeformten und gehärteten, mit einer metallischen Korrosionsschutzbeschichtung überzogenen Stahlbauteils aus einem Stahlflachprodukt
PCT/EP2011/059808 WO2011157690A1 (fr) 2010-06-14 2011-06-14 Procédé de fabrication d'un élément en acier thermoformé et durci, recouvert d'un revêtement métallique anticorrosion, à partir d'un produit plat en acier

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EP (1) EP2580358A1 (fr)
JP (1) JP2013534971A (fr)
KR (1) KR20130085410A (fr)
CN (1) CN102985570B (fr)
BR (1) BR112012030991A2 (fr)
DE (1) DE102010017354A1 (fr)
WO (1) WO2011157690A1 (fr)

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KR20130085410A (ko) 2013-07-29
CN102985570B (zh) 2016-03-30
CN102985570A (zh) 2013-03-20
WO2011157690A1 (fr) 2011-12-22
BR112012030991A2 (pt) 2016-11-08
JP2013534971A (ja) 2013-09-09
DE102010017354A9 (de) 2012-04-05
US20130206284A1 (en) 2013-08-15
DE102010017354A1 (de) 2011-12-15

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