EP3564409A1 - Tôle d'acier plaquée pour formage à chaud à la presse, son procédé de fabrication, procédé de fabrication d'un article formé à chaud à la presse et procédé de fabrication de véhicule - Google Patents

Tôle d'acier plaquée pour formage à chaud à la presse, son procédé de fabrication, procédé de fabrication d'un article formé à chaud à la presse et procédé de fabrication de véhicule Download PDF

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Publication number
EP3564409A1
EP3564409A1 EP17886827.9A EP17886827A EP3564409A1 EP 3564409 A1 EP3564409 A1 EP 3564409A1 EP 17886827 A EP17886827 A EP 17886827A EP 3564409 A1 EP3564409 A1 EP 3564409A1
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EP
European Patent Office
Prior art keywords
steel sheet
zinc
plated steel
film
metal soap
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Withdrawn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
EP17886827.9A
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German (de)
English (en)
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EP3564409A4 (fr
Inventor
Masahiro Kubo
Yoshiaki Nakazawa
Toshiya Suzuki
Narihiko NOMURA
Soshi Fujita
Hideaki IRIKAWA
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Nippon Steel Corp
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Nippon Steel Corp
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Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of EP3564409A1 publication Critical patent/EP3564409A1/fr
Publication of EP3564409A4 publication Critical patent/EP3564409A4/fr
Withdrawn legal-status Critical Current

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    • 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
    • C23C28/02—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 only coatings only including layers of metallic material
    • C23C28/023—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 only coatings only including layers of metallic material only coatings of metal elements only
    • C23C28/025—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 only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • 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
    • 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
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
    • C23C18/1208—Oxides, e.g. ceramics
    • C23C18/1216—Metal oxides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—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
    • 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
    • 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
    • C23C22/05—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 using aqueous solutions
    • C23C22/60—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 using aqueous solutions using alkaline aqueous solutions with pH greater than 8
    • C23C22/66—Treatment of 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
    • 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
    • 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
    • C23C28/34—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
    • C23C28/345—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 with at least one oxide layer

Definitions

  • the present disclosure relates to a plated steel sheet for hot stamping, a method of manufacturing a plated steel sheet for hot stamping, a method of manufacturing a hot-stamped component, and a method of manufacturing a vehicle.
  • thermoforming In general, materials having high mechanical strength tend to have lower shape freezing properties in forming such as bending processing, and when such materials are processed into complicated shapes, processing itself becomes difficult.
  • a so-called “hot stamping method hot stamping method, high temperature stamping method, die quenching method)
  • a hot stamping method a material to be formed is temporarily heated to a high temperature, and the material softened by heating is stamped, molded, and then cooled.
  • this hot stamping method a material is once heated to a high temperature and softened, and therefore, the material can be easily stamped. Therefore, by this hot stamping, a molded component satisfying both favorable shape freezing property and high mechanical strength can be obtained. Particularly when the material is steel, the mechanical strength of the stamped component can be enhanced by quenching effect by cooling after forming.
  • Examples of a method of suppressing such a decrease in productivity include a method of applying coating to a steel sheet.
  • a variety of materials such as an organic material and an inorganic material are used as coating on a steel sheet.
  • a zinc-based plated steel sheet having sacrificial and corrosion-proof action against a steel sheet is widely used for an automobile steel sheet or the like from the viewpoint of corrosion protection performance and steel sheet production technology.
  • the heating temperature in a hot stamping aims at a temperature higher than the Ac3 transformation point of steel in order to obtain quenching effect. In other words, the heating temperature is about from 700 to 1000°C.
  • this heating temperature is higher than the decomposition temperature of an organic material and the boiling point of a metal material such as a Zn-based material. Therefore, when heated for hot stamping, a plating layer on the surface evaporates, which may be a cause of remarkable deterioration of surface properties.
  • an Al-based metal coated steel sheet having higher boiling point than organic material coating or Zn-based metal coating so-called an aluminum-plated steel sheet for a steel sheet subjected to hot stamping to be heated to high temperature.
  • Al-based metal coating By applying Al-based metal coating, it is possible to prevent a scale from adhering to the surface of a steel sheet, and a process such as a descaling step becomes unnecessary, by which the productivity is improved.
  • Al-based metal coating also has anti-rust effect, and therefore, corrosion resistance after painting is also improved.
  • Patent Document 1 A method of using an aluminum-plated steel sheet obtained by applying an Al-based metal coating to steel having a predetermined steel component for hot stamping is described in Patent Document 1.
  • Al-based metal coating when Al-based metal coating is applied, Al coating first melts depending on preheating conditions prior to stamping in a hot stamping method, and thereafter, an Al-Fe compound layer is formed by Fe diffusion from the steel sheet.
  • the Al-Fe compound layer grows to the surface of a steel sheet as an Al-Fe compound layer in some cases.
  • This compound layer is hereinafter referred to as an alloy layer. Since this alloy layer is extremely hard, a processed scratch is formed by contact with a mold during stamping.
  • Patent Document 2 discloses a method of forming a film of a wurtzite type compound such as a film of ZnO on the surface of an aluminum-plated steel sheet for the purpose of improving the hot lubricity, the chemical conversion treatment property, and corrosion resistance for preventing occurrence of processing damage.
  • Patent Document 3 discloses a method of forming a film of one or more Zn compounds selected from the group consisting of Zn hydroxide, Zn phosphate, and organic acid Zn on the surface of an Al-plated steel sheet for the purpose of enhancing adhesion of a film of ZnO during stamping.
  • each of the plated steel sheets described in Patent Documents 2 to 3 is excellent in hot lubricity, and occurrence of processing flaws can be suppressed.
  • abrasion occurs on a sliding surface of a mold for hot stamping in which a plated steel sheet slides, such as a portion to be a vertical wall portion and a flange portion of a stamped component.
  • mold maintenance it is necessary to perform mold maintenance as a countermeasure against wear occurring on a sliding surface of a mold.
  • the plated steel sheets of Patent Documents 2 to 3 were expected to reduce die wear, even with Patent Documents 2 to 3, mold wear was not solved as with other non-plated materials or plated steel sheets.
  • an object of one embodiment of the disclosure is to provide a plated steel sheet for hot stamping that suppresses occurrence of wear of a sliding surface of a mold for hot stamping, and a method of manufacturing such a sheet.
  • Another object of one embodiment of the disclosure is to provide a method of manufacturing a hot stamped product for suppressing occurrence of wear of a sliding surface of a mold for hot stamping and a method of manufacturing a vehicle using a stamped component manufactured with a method of manufacturing a hot-stamped component by using the plated steel sheet for hot stamping.
  • a zinc oxide film layer ZnO film
  • the surface properties of the aluminum plating layer having a convex portion on the surface is reflected on the surface properties of a zinc oxide film.
  • an aluminum plated steel sheet with a zinc oxide film layer formed on the surface slides on the surface of a mold for hot stamping, local pressure is applied to a convex portion of the zinc oxide film, causing wear on a sliding surface of the mold for hot stamping. Therefore, the inventors found that if a zinc oxide film having high smoothness could be formed, the occurrence of wear of the sliding surface of a mold for hot stamping could be suppressed.
  • the gists of the disclosure are as follows.
  • a plated steel sheet for hot stamping for suppressing occurrence of wear of a sliding surface of a mold for hot stamping, and a method of manufacturing such a sheet.
  • the numerical range expressed by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
  • step herein encompasses not only an independent step but also a step of which the desired object is achieved even in a case in which the step is incapable of being definitely distinguished from another step.
  • the plated steel sheet for hot stamping (hereinafter, also referred to as “plated steel sheet”) according to the embodiment includes: a plated steel sheet body including a steel sheet and an aluminum plating layer (hereinafter, also referred to as "Al plating layer”) provided on one side or both sides of the steel sheet; and a zinc-based metal soap film provided on the Al plating layer side surface of the plated steel sheet body and having an adhesion amount of an adhered portion of from 7.1 to 19.8 g/m 2 based on Zn amount.
  • Al plating layer aluminum plating layer
  • the plated steel sheet body may include a zinc oxide film (hereinafter, also referred to as "ZnO film”) provided on the Al plating layer. It is noted that, when the plated steel sheet body includes a ZnO film, the total adhesion amount of adhered portions of the ZnO film and the zinc-based metal soap film is set to from 7.1 to 19.8 g/m 2 based on Zn amount.
  • ZnO film zinc oxide film
  • the plated steel sheet according to the embodiment suppresses occurrence of wear of a sliding surface of a mold for hot stamping (hereinafter, also referred to as "mold") when hot stamped.
  • mold a mold for hot stamping
  • the stamped component obtained by hot stamping the plated steel sheet (plated steel sheet on which a ZnO film was formed on the Al plating layer) and the mold were analyzed, and the following was confirmed.
  • the ZnO film had a convex portion conforming to the surface properties of the Al plating layer (see Fig. 2A : in Fig. 2A , 12 denotes a steel sheet, 14 denotes an Al plating layer, and 16 denotes a ZnO film).
  • the inventors found that the following is effective for suppressing wear of the sliding surface of the mold. 1) Applying lubricant to improve the smoothness of the ZnO film. 2) Using zinc-based metal soap containing Zn as a lubricant in consideration of chemical conversion treatment properties after hot stamping and corrosion resistance. Specifically, the inventors found the following.
  • a zinc-based metal soap film having high smoothness can be formed (see Fig. 1A : 10 denotes a plated steel sheet, 10A denotes a plated steel sheet body, 12 denotes a steel sheet, 14 denotes an Al plating layer, 16 denotes a ZnO film, and 18 denotes a zinc-based metal soap film.).
  • this zinc-based metal soap film zinc is oxidized by heating before stamping of hot stamping, and an organic substance (a fatty acid or the like) other than zinc is decomposed, resulting in a ZnO film.
  • a ZnO film having a high smoothness for example, a ZnO film having a maximum value of the skewness Rsk of the surface roughness curve less than 0
  • the zinc-based metal soap film may be heated to form a ZnO film.
  • 10 denotes a plated steel sheet
  • 10A denotes a plated steel sheet body
  • 12 denotes a steel sheet
  • 14 denotes an Al plating layer
  • 16 denotes a ZnO film
  • 18 A denotes a ZnO film formed of a zinc-based metal soap film
  • 26 denotes a metal mold.
  • the inventors found that the plated steel sheet according to the embodiment suppresses occurrence of wear of a sliding surface of a mold for hot stamping when hot stamped by the above configuration.
  • a ZnO film formed from a zinc-based metal soap film is difficult to peel off during hot stamping and after molding, and wear of a mold hardly occurs. Therefore, a molded component having high mass productivity, high chemical conversion processability, excellent adhesion between an Al plating layer and a ZnO film after molding, and high corrosion resistance (or corrosion resistance after coating) is obtained.
  • the plated steel sheet body includes a steel sheet and an Al plating layer provided on one side or both sides of the steel sheet.
  • the plated steel sheet body may have a ZnO film provided on the Al plating layer.
  • steel sheet for example, it is preferable to use a steel sheet formed to have high mechanical strength (meaning properties related to mechanical deformation and fracture such as tensile strength, breakdown point, elongation, drawing, hardness, impact value, fatigue strength, or creep strength).
  • high mechanical strength meaning properties related to mechanical deformation and fracture such as tensile strength, breakdown point, elongation, drawing, hardness, impact value, fatigue strength, or creep strength.
  • a steel sheet preferably contains at least one of C: from 0.1 to 0.6%, Si: from 0.01 to 0.6%, Mn: from 0.5 to 3%, Ti: from 0.01 to 0.1%, and B: from 0.0001 to 0.1% based on % by mass, the balance being Fe and impurities.
  • C is included for securing an intended mechanical strength.
  • C is less than 0.1%, sufficient improvement in mechanical strength can not be obtained and the effect of containing C is poor.
  • C exceeds 0.6%, although a steel sheet can be further cured, melt cracking is likely to occur. Therefore, the C content is preferably from 0.1% to 0.6%.
  • Si is one of strength improving elements for improving the mechanical strength, and is contained in order to ensure an intended mechanical strength like C.
  • Si is less than 0.01%, a strength improving effect is hardly exerted, and sufficient improvement in mechanical strength can not be obtained.
  • Si is also an easily oxidizable element. Therefore, when Si exceeds 0.6%, the wettability decreases and non-plating may occur when molten aluminum plating is performed. Therefore, the Si content is preferably from 0.01% to 0.6%.
  • Mn is one of the strengthening elements for strengthening steel, and is also one of elements which increase the hardenability. Further, Mn is also effective for preventing hot embrittlement caused by S which is one of impurities. When Mn is less than 0.5%, these effects can not be obtained, and when the Mn is 0.5% or more, the above effects are exerted. On the other hand, when Mn exceeds 3%, there is a fear that the residual ⁇ phase becomes too much and the strength decreases. Therefore, the Mn content is preferably from 0.5% to 3%.
  • Ti is one of the strength strengthening elements, and is also an element for improving the heat resistance of an Al plating layer.
  • Ti is less than 0.01%, a strength improving effect or an oxidation resistance improving effect can not be obtained, and these effects are exerted at 0.01% or more.
  • too much Ti is contained in a steel, there is a risk of, for example, forming a carbide or a nitride, and softening the steel.
  • the Ti content is preferably from 0.01% to 0.1%.
  • B acts during quenching and has an effect of improving the strength.
  • B is less than 0.0001%, such a strength improving effect is low.
  • B exceeds 0.1%, there is a risk of forming inclusions and embrittling and lowering the fatigue strength. Therefore, the B content is preferably from 0.0001% to 0.1%.
  • This steel sheet may contain impurities that may be mixed in other manufacturing processes or the like.
  • a steel sheet formed from such a chemical component can be quenched by heating by a hot stamping method or the like, and have a mechanical strength of about 1,500 MPa or higher.
  • this steel sheet has such a high mechanical strength, when the steel sheet is processed by a hot stamping method, since a hot stamping can be performed with the steel sheet being softened by heating, the steel sheet can be easily molded.
  • the steel sheet can realize high mechanical strength, and as a result, even when the sheet is thinned for weight reduction, mechanical strength can be maintained or improved.
  • An Al plating layer is formed on one side or both sides of a steel sheet before plating.
  • the Al plating layer is formed on one side or both sides of the steel sheet by, for example, a hot plating method, but the forming method is not limited thereto.
  • the component composition of the Al plating layer may be 50% or more of Al.
  • the element other than Al is not particularly limited, and Si may be positively contained for the following reason.
  • the Si content in the Al plating layer is preferably from 3 to 15%.
  • An Al plating layer prevents corrosion of a steel sheet. Further, when the plated steel sheet is processed by a hot stamp method, the Al plating layer does not oxidize the surface and does not generate a scale (iron oxide) even when heated to a high temperature. By preventing generation of a scale with the Al plating layer, it is possible to omit a step of removing the scale, a surface cleaning step, a surface treatment step, or the like, and the productivity of a molded component is improved.
  • the Al plating layer has a higher boiling point and melting point than a plating layer of an organic material or a plating layer of another metal-based material (for example, a Zn-based material). Therefore, when forming by hot stamping is performed, since the plating layer does not evaporate, hot stamping at a high temperature becomes possible. Therefore, the formability in hot stamping can be further enhanced, and molding can be easily performed.
  • the Al plating layer can be alloyed with Fe in the steel sheet by heating during hot plating and hot stamping. Therefore, the Al plating layer is not necessarily formed of a single layer having a constant component composition, and includes a partially alloyed layer (alloy layer).
  • a ZnO film (coating containing ZnO) is formed on the surface of the Al plating layer of the plated steel sheet body, if necessary.
  • the ZnO film is formed on the entire surface of the Al plating layer of the plated steel sheet body. In a region where the ZnO film serves as the outermost surface layer of the plated steel sheet, the ZnO film gives the hot lubricity, the chemical conversion property, and the corrosion resistance to the plated steel sheet.
  • the method of forming the ZnO film is not particularly limited, and can be formed on the Al plating layer by the methods described in Patent Documents 1 and 2, for example.
  • the adhesion amount of an adhered portion of the ZnO film (hereinafter, also simply referred to as "adhesion amount”) is preferably from 0.5 to 7 g/m 2 based on Zn amount per one side of a steel sheet.
  • adhesion amount of ZnO film is 0.5 g/m 2 or more based on the Zn amount, a lubrication improving effect can be effectively exerted in a region in contact with a part other than the sliding surface of a mold in hot stamping.
  • the adhesion amount of the ZnO film is particularly preferably about from 1 to 4 g/m 2 based on the Zn amount per one side of a steel sheet, lubricity at the time of hot stamping can also be secured in a region which is in contact with a part other than the sliding surface of a mold during hot stamping, and weldability and paint adhesion are also favorable.
  • a fluorescent X-ray method As a method of measuring the adhesion amount of the ZnO film, a fluorescent X-ray method is used. Specifically, a calibration curve is prepared by using fluorescent X-ray method using several kinds of standard samples whose adhesion amount of the ZnO film (based on Zn amount) is known, the Zn intensity of a sample to be measured is converted into the adhesion amount of ZnO film, and the adhesion amount of the ZnO film is determined.
  • a zinc-based metal soap film (coating containing a zinc-based metal soap) is provided on the surface of the plated steel sheet body on the Al plating layer side. Specifically, when a ZnO film is not provided on the Al plating layer of the plated steel sheet body, a zinc-based metal soap film is provided on the surface (entire surface) of the Al plating layer. On the other hand, when a ZnO film is provided on the Al plating layer of the plated steel sheet body, a zinc-based metal soap film is provided on at least a part of the surface of the ZnO film.
  • Examples of the metal soap of the zinc-based metal soap film include a metal salt (fatty acid zinc salt) of a fatty acid (for example, a fatty acid having from 7 to 20 carbon atoms) and zinc.
  • the fatty acid may be either a saturated fatty acid or an unsaturated fatty acid.
  • the metal soap of the zinc-based metallic soap coating is preferably a liquid metal soap at room temperature (25°C).
  • the zinc-based metal soap film include a film of at least one zinc-based metal soap selected from the group consisting of zinc bis-octanoate, zinc octylate, zinc laurate, and zinc stearate.
  • the zinc-based metal soap film is formed using a zinc-based metal soap for lubricant application, it becomes a film with high smoothness.
  • zinc-based metal soap film for example, zinc is oxidized by heating at 300°C or higher (heating before stamping by hot stamping or preheating before hot stamping), and an organic substance (a fatty acid or the like) other than zinc is decomposed to obtain a ZnO film.
  • a region where the zinc-based metal soap film of the plated steel sheet body is provided becomes a region covered with the ZnO film derived from the zinc-based metal soap film by heating.
  • a ZnO film having high smoothness (for example, a ZnO film satisfying the maximum value of the skewness Rsk of the surface roughness curve satisfying Rsk ⁇ 0) can be formed.
  • a ZnO film having high smoothness is used to hot stamp a plated steel sheet, wear of the sliding surface of a mold on which the plated steel sheet slides is suppressed.
  • the adhesion amount of the adhered portion of the zinc-based metal soap film is affected by the surface properties of an underlying plated steel sheet body (Al plating layer) when the amount is too small or too large, and the smoothness of the zinc-based metal soap film and the smoothness of the ZnO film formed from a zinc-based metal soap film decrease.
  • the adhesion amount (hereinafter also simply referred to as "adhesion amount”) of an adhered portion of the zinc-based metal soap film is, based on Zn amount, from 7.1 to 19.8 g/m 2 , and preferably from 8.82 to 16.3 g/m 2 .
  • the adhesion amount may be in the range of, based on Zn amount, from 8.9 to 19.8 g/m 2 , 9.2 to 19.8 g/m 2 , or from 9.5 to 19.8 g/m 2 .
  • the adhesion amount of the zinc-based metal soap film is needed to be considered such that both the surface of the ZnO film of the underlying plated steel sheet body and the surface of the ZnO film formed of the zinc-based metal soap film are smooth.
  • the total of the adhesion amount of a zinc-based metal soap film with the adhesion amount of a ZnO film of a plated steel sheet body is, based on Zn amount, from 7.1 to 19.8 g/m 2 , and preferably from 8.82 to 16.3 g/m 2 .
  • the adhesion amount may be in the range of, based on Zn amount, from 8.9 to 16.3 g/m 2 , from 9.2 to 16.3 g/m 2 , or from 9.5 to 16.3 g/m 2 .
  • the adhesion amount of the zinc-based metal soap film to the total adhesion amount of the ZnO film and the zinc oxide film is not less than half, from the viewpoint of enhancing the smoothness of the surface of a ZnO film formed from the zinc-based metal soap film.
  • a fluorescent X-ray method As a method of measuring the adhesion amount of the zinc-based metal soap film, for example, a fluorescent X-ray method is used. Specifically, a calibration curve is prepared by using a fluorescent X-ray method using several types of standard samples with known amounts of zinc-based metal soap film (based on Zn amount), the Zn intensity of a sample to be measured is converted into the adhesion amount of the zinc-based metal soap film, and the adhesion amount of the zinc-based metal soap film is determined.
  • the zinc-based metal soap film is preferably formed at least on the surface of the plated steel sheet body on the Al plating layer side surface which is in contact with a sliding surface of a mold for hot stamping.
  • the zinc-based metal soap film is preferably formed at least on the surface of the plated steel sheet (the Al plating layer or the ZnO film of the plated steel sheet main body) which is to be a vertical wall portion and a flange portion of a stamped component to be obtained.
  • a plated steel sheet at a portion to be a vertical wall portion and a flange portion of a stamped component is a site where the surface is formed while being slid on a mold (for example, "a holder portion and a shoulder portion for holding a steel sheet” in an upper mold, "a holder portion and a shoulder portion for holding a steel sheet” in a lower mold) (see Fig. 3 (8)), the portion is a region where wear is likely to occur in the mold.
  • a zinc-based metal soap film is preferably formed on the entire surface of the Al plating layer.
  • the plated steel sheet according to the embodiment as described above is used for hot stamping in a state having a zinc-based metal soap film, and may be used for hot stamping in a state in which the zinc-based metal soap film was heated in advance and a ZnO film was formed.
  • the plated steel sheet according to the embodiment may be used for hot stamping as a plated steel sheet for hot stamping including: a plated steel sheet body including a steel sheet and an Al plating layer provided on one side or both sides of the steel sheet; and a ZnO film provided on the surface of the plated steel sheet body on the Al plating layer side, wherein the maximum value of the skewness Rsk of the roughness curve of the surface of the ZnO film is less than 0.
  • the skewness Rsk of the roughness curve is measured in accordance with JIS B 0601 (2001). Specifically, the skewness Rsk of the roughness curve is measured in accordance with IS B 0601 (2001) under the following measurement conditions.
  • Measuring device "Surface roughness/Profile shape measuring machine Form Tracer" manufactured by Mitutoyo Corporation Measurement length L: 9.6 mm Cutoff wavelength ⁇ c : 0.8 mm Stylus tip shape: Tip angle 60° cone Stylus tip radius: 2 ⁇ m Measurement speed: 1 mm/sec
  • the skewness Rsk of the roughness curve is defined in JIS B 0601 (2001) and is an index indicating the symmetry of ridges and valleys with respect to the average line of the roughness curve.
  • Rsk is positive (0 ⁇ Rsk)
  • the peaks and valleys are unevenly distributed downward from the average line of the roughness curve.
  • Rsk is negative (Rsk ⁇ 0)
  • the peaks and valleys are unevenly distributed upward from the average line of the roughness curve.
  • Rsk is negative (Rsk ⁇ 0)
  • the number of ridges protruding on the surface is small and the smoothness is high.
  • the maximum value of Rsk on the surface of the ZnO film is preferably less than 0.
  • the method of manufacturing a plated steel sheet according to the embodiment includes a step of forming a zinc-based metal soap film on the surface of a plated steel sheet body on the Al plating layer side.
  • the method of manufacturing the plated steel sheet includes a step of forming a zinc-based metal soap film on the surface of the Al plating layer.
  • the method of manufacturing a plated steel sheet includes a step of forming a zinc-based metal soap film on at least a part of the surface of the ZnO film.
  • the adhesion amount of a zinc-based metal soap film is, based on Zn amount, from 7.1 to 19.8 g/m 2 , and preferably from 8.82 to 16.3 g/m 2 .
  • the total adhesion amount of the zinc-based metal soap film with the adhesion amount of the ZnO film on the plated steel sheet body is set to, based on Zn amount, from 7.1 to 19.8 g/m 2 , and preferably from 8.82 to 16.3 g/m 2 .
  • the adhesion amount of the zinc-based metal soap film to the total adhesion amount of the ZnO film and the zinc oxide film is not less than half, from the viewpoint of enhancing the smoothness of the surface of a ZnO film formed from the zinc-based metal soap film.
  • a zinc-based metal soap film is formed by applying a zinc-based metal soap itself utilizing a well-known coating apparatus such as a spray coater, a roll coater, or a die coater.
  • a zinc-based metal soap film may be formed by utilizing a sponge, an electrostatic lubricating device, or the like.
  • the viscosity of the zinc-based metal soap may be adjusted with an organic solvent.
  • a zinc-based metal soap film is formed by drying the coating film of the zinc-based metal soap, if necessary, for example at 300°C or higher for 2 minutes or more.
  • the type of the zinc-based metal soap and a formation region of the zinc-based metal soap film are as described above.
  • the method of manufacturing a plated steel sheet according to the embodiment may include a step of heating a zinc-based metal soap film at 300°C or higher to form a ZnO film.
  • a ZnO film for example, a ZnO film whose surface roughness curve skewness Rsk satisfies Rsk ⁇ 0
  • the obtained plated steel sheet may be used for hot stamping.
  • Heating to convert a zinc-based metal soap film to a ZnO film is preferably performed under conditions of 300°C or higher and 2 minutes or more.
  • the method of manufacturing a hot-stamped component according to the embodiment is a method of manufacturing a formed component by hot stamping the plated steel sheet according to the embodiment.
  • a zinc-based metal soap film in a step of forming a zinc-based metal soap film, at least a zinc-based metal soap film is formed on the surface of the plated steel sheet body on the Al plating layer side surface which is in contact with a sliding surface of a mold for hot stamping, and then, the manufactured plated steel sheet for hot stamping is hot stamped.
  • the zinc-based metal soap film of the plated steel sheet becomes a ZnO film by heating before stamping, the plated steel sheet is stamped.
  • a plated steel sheet manufactured through a step of heating a zinc-based metal soap film at 300°C or higher and obtaining a ZnO film whose skewness Rsk of the surface roughness curve satisfies 0 ⁇ Rsk may be hot-stamped.
  • a hot stamping method of example after blanking (punching) if necessary, heating is performed at a high temperature and a plated steel sheet is softened. Then, using a mold, softened plated steel sheet is stamped and formed, and then cooled. In this way, in hot stamping, subsequent stamping can be easily performed by once softening the plated steel sheet.
  • the stamped component hot stamped is quenched by heating and cooling to obtain a formed component having a high tensile strength of about 1500 MPa or higher.
  • a heating method of hot stamping other than a normal electric furnace and a radiant tube furnace, a heating method by infrared heating, electrification heating, induction heating, or the like may be employed.
  • the Al plating layer of the plated steel sheet melts when heated above the melting point, and at the same time, the Al phase changes to Al-Fe alloy phase, Al-Fe-Si alloy phase due to mutual diffusion with Fe.
  • the melting points of the Al-Fe alloy phase and the Al-Fe-Si alloy phase are high and about 1150°C.
  • the state of the Al plating layer preferable as a stamped component is a state in which the layer is alloyed to the surface and in which the Fe concentration in the alloy phase is not high.
  • unalloyed Al remains, only this portion is rapidly corroded, corrosion resistance after coating deteriorates, and coating film blistering tends to occur very easily, which is not preferable.
  • the Fe concentration in the alloy phase becomes too high, the corrosion resistance of the alloy phase itself decreases, corrosion resistance after coating deteriorates, and coating film blistering is likely to occur.
  • the corrosion resistance of the alloy phase depends on the Al concentration in the alloy phase. Therefore, in order to improve the corrosion resistance after coating, the state of alloying is controlled by the Al adhesion amount and heating conditions.
  • the average temperature rising rate in a temperature range from 50°C to the temperature 10°C lower than the highest attainable sheet temperature is preferably set to from 10 to 300°C/s.
  • the average temperature rising rate affects productivity in hot stamping of a plated steel sheet. When the average temperature rising rate is less than 10°C/s, it takes time to soften a plated steel sheet for hot stamping. On the other hand, when the temperature exceeds 300°C, although softening is rapid, alloying of the Al plating layer is considerable, which may cause powdering.
  • the average temperature rising rate is about 5°C/sec in the case of atmosphere heating. An average temperature rising rate of 100°C/s or more can be achieved by electric heating or high frequency induction heating.
  • the maximum attainable temperature is not particularly limited, and when the temperature is less than 850°C, sufficient quench hardness can not be obtained, which is not preferable.
  • the Al plating layer also needs to be made of an Al-Fe alloy phase. From these viewpoints, the maximum attainable temperature is preferably 850°C or higher.
  • the upper limit of the maximum attainable temperature is preferably 1100°C or lower in consideration of economic efficiency.
  • an example of a normal process from manufacturing of a plated steel sheet to hot stamping is as follows.
  • an Al plating layer is formed on one side or both sides of a steel sheet ( Fig. 3 (1): 12 in Fig. 3 denotes a steel sheet) ( Fig. 3 (2): 14 in Fig.3 denotes an Al plating layer).
  • a ZnO film is formed on the surface of the Al plating layer ( Fig. 3 (3): 16 in Fig. 3 denotes a ZnO film).
  • Fig. 3 (4): 20 in Fig. 3 denotes a plated steel sheet wound in a coil shape (plated steel sheet body in the embodiment)).
  • a plated steel sheet wound in a coil shape is drawn out and blanking (blanking processing) is performed ( Figs. 3(5) to 3(6) : 22 in Fig. 3 denotes a blank).
  • Fig. 3(7) : 24 in Fig. 3 denotes a heating furnace).
  • the heated blank is stamped with a pair of upper and lower molds and formed and quenched ( Fig. 3 (8): 26A in Fig. 3 denotes an upper mold and 26B denotes a lower mold).
  • Fig. 3(9) : 28 in Fig. 3 denotes a stamped component
  • a zinc-based metal soap film is formed in each step or between steps after formation of Al plating layer before a plated steel sheet (blank material) is heated.
  • a zinc-based metal soap film 1 is formed on the surface of an Al plating layer of a plated steel sheet main body (blank after blanking or the like) after forming the Al plating layer (when a zinc-based metal soap film is formed on the entire surface of an Al plating layer, formation of a ZnO film may be omitted), or, 2) a zinc-based metal soap film is formed on the surface of a ZnO film of a plated steel sheet body (blank after blanking or the like) after formation of a ZnO film.
  • a site where a zinc-based metal soap film is formed is preferably on the entire surface of an Al plating layer or a ZnO film, and may be on a surface in contact with a sliding surface of a mold for hot stamping.
  • a surface of the plated steel sheet in contact with the sliding surface of the mold for hot stamping is, for example, the surface of the plated steel sheet (the Al plating layer or the ZnO film of the plated steel sheet main body) to be a vertical wall portion and a flange portion of a stamped component to be obtained.
  • the surface of a plated steel sheet which is in contact with a sliding surface of a mold for hot stamping is the surface of the plated steel sheet (plated steel sheet body) which is in contact with "a holder portion and a shoulder portion for holding a steel sheet" in an upper mold and "a holder portion and a shoulder portion for holding a steel sheet” in a lower mold (see Fig. 3(8) : in Fig. 3 , 26A1 denotes a holder portion of the upper mold, 26A2 denotes a shoulder portion of the upper mold, 26B1 denotes a holder portion of the lower mold, and 26B2 denotes a shoulder portion of the lower mold).
  • Heating of a plated steel sheet before stamping may be performed with a zinc-based metal soap film as it is, or performed after the zinc-based metal soap film is formed into a ZnO film.
  • a variety of stamped components can be manufactured.
  • a surface on which a ZnO film is formed is particularly excellent in corrosion resistance (or coating corrosion resistance). For this reason, when a stamped component for a vehicle is manufactured, it is preferable to manufacture a vehicle by attaching the manufactured stamped component with the surface of a ZnO film facing the outer side of the vehicle.
  • a stamped component (such as a center pillar outer, a door outer, a roof rail outer, a side panel, or a fender) that is exposed when attached to a vehicle is manufactured by the hot stamping method according to the embodiment.
  • the stamped components are attached to a vehicle, the stamped components are attached to the vehicle in such a manner that the "surface on which a ZnO film is formed" faces the outer side of the vehicle (for example, in such a manner to be exposed from the vehicle).
  • Both sides of a cold-rolled steel sheet having a thickness shown in Table 1(based on % by mass, C: 0.21%, Si: 0.12%, Mn: 1.21%, P: 0.02%, S: 0.012%, Ti: 0.02%, B: 0.03%, Al: 0.04%, and the balance: Fe and impurities) were Al plated by a Sendzimir process.
  • the annealing temperature was about 800°C
  • an Al plating bath contained 9% Si and further contained Fe eluted from the cold-rolled steel sheet.
  • the Al basis weight after plating was adjusted by a gas wiping method, the Al basis weight per one side shown in Table 1 was obtained, and the sheet was then cooled. Thereafter, a chemical solution (nanotek slurry manufactured by C.
  • Both sides of a cold-rolled steel sheet having a thickness shown in Table 1 (based on % by mass, C: 0.21%, Si: 0.12%, Mn: 1.21%, P: 0.02%, S: 0.012%, Ti: 0.02%, B: 0.03%, Al: 0.04%, and the balance: Fe and impurities) were Al plated by a Sendzimir process.
  • the annealing temperature was about 800°C
  • an Al plating bath contained 9% Si and further contained Fe eluted from the cold-rolled steel sheet.
  • the Al basis weight after plating was adjusted by a gas wiping method, the Al basis weight per one side shown in Table 1 was obtained, and the sheet was then cooled. Thereafter, a chemical solution (nanotek slurry manufactured by C.
  • Both sides of a cold-rolled steel sheet having a thickness shown in Table 1 (based on % by mass, C: 0.21%, Si: 0.12%, Mn: 1.21%, P: 0.02%, S: 0.012%, Ti: 0.02%, B: 0.03%, Al: 0.04%, and the balance: Fe and impurities) were Al plated by a Sendzimir process.
  • the annealing temperature was about 800°C
  • an Al plating bath contained 9% Si and further contained Fe eluted from the cold-rolled steel sheet.
  • the Al basis weight after plating was adjusted by a gas wiping method, the Al basis weight per one side shown in Table 1 was obtained, and the sheet was then cooled.
  • zinc bis-octanoate (Zn-OCTOATE 22% solvent-free” manufactured by DIC Corporation) as zinc-based metal soap was coated on the Al plating layer thus formed with a roll coater, and a zinc-based metal soap film having an adhesion amount shown in Table 1 was formed. In this way, a test material of a plated steel sheet was obtained.
  • Characteristics of the test material of the plated steel sheet manufactured as described above were evaluated by the following method.
  • the average temperature rising rate during heating to 920°C was 7.5°C/s.
  • the apparatus for evaluating hot lubricity illustrated in Fig. 4 includes a near infrared heating furnace 100 and a mold including an upper mold 102A and a lower mold 102B.
  • the upper mold 102A and the lower mold 102B include convex portions with a width of 10 mm extending in a direction orthogonal to the drawing direction of a plated steel sheet, and a predetermined spressing load is applied by sandwiching the test material between top surfaces of the convex portions.
  • the apparatus for evaluating hot lubricity also includes a plated steel sheet heated in a near infrared heating furnace 100 and a thermocouple (not shown) for measuring the temperature of the plated steel sheet when the sheet is sandwiched between molds.
  • a thermocouple (not shown) for measuring the temperature of the plated steel sheet when the sheet is sandwiched between molds.
  • 10 denotes a test material of a plated steel sheet.
  • a test material of 30 mm ⁇ 500 mm was heated at 920°C in a nitrogen atmosphere by the near infrared heating furnace 100, and then, the specimen which had reached about 700°C was drawn out while applying a pressing load of 3 kN (or while sliding the test material on the mold) with a mold composed of an upper mold 102A and a lower mold 102B, and the drawing load was measured.
  • the drawing length was 100 mm, and the drawing speed was 40 mm/s.
  • the mold wear amount was measured by analyzing the surface shape difference of "mold of apparatus for measuring hot lubricity" before and after the evaluation test of (1) Hot Lubricity. Specifically, using a contact-type shape measuring machine, profiles of the mold surface at a sliding portion before and after sliding were measured, and the mold wear amount was measured. The mold wear amount was the average value of the wear amounts of the upper mold and the lower mold.
  • the adhesion amount (based on Zn amount) of the ZnO film on the surface of the test material after the evaluation test of (1) Hot Lubricity was measured by the above-described method.
  • the total amount adhered on the surface based on Zn amount means "adhesion amount (based on Zn amount) of ZnO film and zinc-based metal soap film”.
  • Steel type Test material of plated steel sheet Evaluation Sheet thickness Al basis mass per side Adhesion amount of ZnO film (based on Zn amount) Adhesion amount of zinc-based metal soap film (based on Zn amount) Total amount adhered on the surface based on Zn amount Adhesion amount of ZnO film of test material (after heating) (based on Zn amount) Hot friction coefficient Mold wear amount
  • Surface properties of test material (maximum value of skewness Rsk) mm g/m 2 g/m 2 g/m 2 g/m 2 g/m 2 - ⁇ m Comparative Example 1 1.4 80 0.70 0.00 0.70 0.70 0.46 1.70 + Comparative Example 2 1.6 40 0.80 0.00 0.80 0.80 0.53 2.73 + Comparative Example 3 1.8 60 2.00 0.00 2.00 2.00 0.51 1.47 + Comparative Example 4
  • the total adhesion amount of zinc-based metal soap film with the adhesion amount of ZnO film was larger than 8.8 g/m 2 (not including 8.8) based on Zn amount, and when the amount is 16.3 g/m 2 or less, mold wear is suppressed and the hot friction coefficient is 0.4 or less, and as a result, the formability of a material in hot stamping (hot stamp) can be improved.
  • a target (period) and conditions (formation method, adhesion amount, presence or absence of a heating step in which a zinc-based metal soap film is made into a ZnO film, site to be formed) for forming a zinc-based metal soap film were changed as shown in Table 2, and stamped components (dish-like shaped components) were manufactured.
  • the surface of the Al plating layer was a target for forming a zinc-based metal soap film, no ZnO film was formed.
  • the plated steel sheet was heated to 900°C, and then stamped under conditions of 700°C and 3 kN pressing load.
  • the type of the steel sheet, conditions for forming the Al plating layer, condition for forming the ZnO film, and the type of the zinc-based metal soap were the same as in Example 1.
  • the column adhesion amount (based on Zn amount) of Zinc-based aliphatic metal soap film indicates, for Example 9 in which a zinc-based aliphatic metal soap film is formed on the surface of the Al plating layer, "Adhesion amount (based on Zn amount) of the zinc-based aliphatic metal soap film itself", and indicates, for Examples 10 to 16 in which the zinc-based aliphatic metal soap film is formed on the surface of the ZnO film, "the total adhesion amount (based on Zn amount) of the ZnO film and the zinc-based aliphatic metal soap film”.

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EP17886827.9A 2016-12-28 2017-12-21 Tôle d'acier plaquée pour formage à chaud à la presse, son procédé de fabrication, procédé de fabrication d'un article formé à chaud à la presse et procédé de fabrication de véhicule Withdrawn EP3564409A4 (fr)

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EP4140613A4 (fr) 2020-04-20 2023-05-10 Nippon Steel Corporation Procédé de fabrication d'un article formé à la presse à chaud et article formé à la presse à chaud
CN111705282B (zh) * 2020-06-24 2022-04-08 浙江东南新材科技有限公司 一种高强度镀锌钢卷的生产工艺

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CN110114510A (zh) 2019-08-09
JPWO2018123831A1 (ja) 2018-12-27
RU2710396C1 (ru) 2019-12-26
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JP6369659B1 (ja) 2018-08-08
MX2019007700A (es) 2019-09-13
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CN110114510B (zh) 2020-06-09

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