WO2019066063A1 - めっき鋼板、めっき鋼板コイル、熱間プレス成形品の製造方法、及び自動車部品 - Google Patents
めっき鋼板、めっき鋼板コイル、熱間プレス成形品の製造方法、及び自動車部品 Download PDFInfo
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- WO2019066063A1 WO2019066063A1 PCT/JP2018/036550 JP2018036550W WO2019066063A1 WO 2019066063 A1 WO2019066063 A1 WO 2019066063A1 JP 2018036550 W JP2018036550 W JP 2018036550W WO 2019066063 A1 WO2019066063 A1 WO 2019066063A1
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- plated steel
- steel plate
- steel sheet
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- 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
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- 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
- B21D22/201—Work-pieces; preparation of the work-pieces, e.g. lubricating, coating
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- 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
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- 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
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- 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
- B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
- B21D24/04—Blank holders; Mounting means therefor
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- 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
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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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
- 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
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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
- 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
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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
- 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
- C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
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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
- 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
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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
- 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
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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
- 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
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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
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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
- C23C28/32—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
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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
- 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
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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
- C23C28/347—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 layers adapted for cutting tools or wear applications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
Definitions
- the present disclosure relates to a plated steel plate, a plated steel coil, a method of manufacturing a hot press-formed product, and an automobile part.
- hot press forming (hot press method, high temperature press method, die quench method)" is mentioned as one of the means for solving the problem about this formability.
- a material to be formed is temporarily heated to a high temperature, and a steel sheet softened by heating is subjected to press forming to form, and then cooled.
- this hot press forming since the material is once heated to a high temperature and softened, the material can be easily press-processed, and the mechanical strength of the material can be further improved by the quenching effect by cooling after forming. It can be enhanced. Therefore, by this hot press forming, a molded article having both good shape freezeability and high mechanical strength can be obtained.
- the method of coating to a steel plate is mentioned.
- various materials such as organic materials and inorganic materials are used as a coating on a steel plate.
- zinc-based plated steel plates having a sacrificial anticorrosion effect on steel plates are widely used for automobile steel plates and the like from the viewpoint of their anticorrosion performance and steel plate production technology.
- the heating temperature (700 to 1000 ° C.) in hot press forming is higher than the decomposition temperature of organic materials and the boiling point of metallic materials such as Zn, and when heated for hot press forming, The plating layer may evaporate to cause significant deterioration of the surface properties.
- aluminum-coated steel plates having a boiling point higher than that of organic-based material coatings or Zn-based metal coatings, so-called aluminum-plated steel plates are used It is preferable to do.
- Patent Document 1 describes a method in which an aluminum-plated steel sheet obtained by applying an Al-based metal coating to a steel having a predetermined steel component is used for hot press forming.
- Al-based metal coating when Al-based metal coating is applied, depending on the conditions of preheating before press forming, the Al coating is first melted and then changed to an aluminum-iron alloy layer by Fe diffusion from the steel plate, In some cases, the aluminum-iron alloy layer grows to become an aluminum-iron alloy layer up to the surface of the steel plate.
- Al—Fe alloy the aluminum-iron alloy is also referred to as “Al—Fe alloy” or “alloy”. Since this alloy layer is extremely hard, processing flaws are formed by contact with the mold at the time of pressing.
- Patent Document 2 for the purpose of improving chemical conversion treatability and corrosion resistance together with hot lubricity to prevent generation of processing flaws, wurtz such as zinc oxide film (hereinafter also referred to as "ZnO film”) A method of forming a coating of a mineral compound on the surface of an Al-plated steel sheet is disclosed.
- ZnO film zinc oxide film
- Patent Document 3 discloses a film of one or more Zn compounds selected from the group consisting of Zn hydroxide, Zn phosphate, and an organic acid Zn for the purpose of enhancing the adhesion of the ZnO film during press molding. Discloses a method of forming Al on a surface of an Al-plated steel sheet. In the method of Patent Document 3, a heat of press forming an Al-plated steel sheet on which a film of a Zn compound is formed generates a film of ZnO, thereby forming a ZnO film having excellent adhesion, and hot lubrication And coating adhesion, spot weldability, and corrosion resistance after coating can be improved.
- JP 2000-38640 A International Publication No. 2009/131233 JP, 2014-139350, A
- any of the plated steel sheets of Patent Documents 2 to 3 is excellent in hot lubricity and can suppress the generation of processing flaws.
- the sliding of the hot press forming die with which the plated steel plate slides such as the portion to be the vertical wall portion and flange portion of the press-formed product Wear occurs on the moving surface.
- mold maintenance is necessary as a countermeasure against the wear generated on the sliding surface of the mold.
- the subject of this indication provides the plated steel plate which suppresses generation
- another subject of the present disclosure is a plated steel coil, which uses this plated steel sheet and suppresses the occurrence of wear on the sliding surfaces of both the upper mold and the lower mold of a hot press molding die, and a thermal A method of manufacturing an inter-press-formed product and an automobile part using a press-formed product manufactured by a method of manufacturing a hot press-formed product.
- the gist of the present disclosure is as follows.
- a first aluminum plating layer provided on the first surface of the steel plate; A zinc compound layer or a metallic zinc layer provided on the surface of the first aluminum plating layer; A second aluminum-plated layer provided on the second surface and the outermost surface of the steel plate; Plated steel sheet.
- the adhesion amount of the second aluminum plating layer is 20 to 100 g / m 2 in terms of Al amount.
- ⁇ 4> The plated steel sheet according to any one of ⁇ 1> to ⁇ 3>, wherein the adhesion amount of the first aluminum plating layer is larger than the adhesion amount of the second aluminum plating layer.
- ⁇ 5> It is a plated steel plate coil in which the plated steel plate according to any one of ⁇ 1> to ⁇ 4> is wound, The plated steel plate coil in which the first surface of the plated steel sheet faces outward and the second surface faces inward.
- ⁇ 6> After heating the plated steel plate of any one of ⁇ 1> to ⁇ 4>, it is pressed by a die having an upper die and a lower die, and a hot press-formed product is formed by hot press forming.
- the manufacturing method of the hot press-formed article which performs the press of the said plated steel plate in the state which orient
- ⁇ 9> The method for producing a hot press-formed product according to any one of ⁇ 6> to ⁇ 8>, wherein the mold has a holder for pressing the plated steel sheet.
- a plated steel sheet which suppresses the occurrence of wear of the sliding surface of both the upper and lower molds of a hot press molding die when used in a hot press forming application.
- a plated steel sheet coil which uses this plated steel sheet and suppresses the occurrence of scratches on the sliding surface of both the upper mold and the lower mold of a hot press molding die, and a hot press It is possible to provide an automobile part using a press-formed product manufactured by the method of manufacturing a molded product and the method of manufacturing a hot press-formed product.
- the plated steel plate according to the present embodiment includes a steel plate, a first aluminum plated layer provided on the first surface of the steel plate, a zinc compound layer or a metallic zinc layer provided on the surface of the first aluminum plated layer, And a second aluminum-plated layer provided on the second surface and the outermost surface of the steel plate.
- the plated steel plate according to the present embodiment has the zinc compound layer or the metallic zinc layer as the outermost surface layer on the first surface side of the steel plate and the second aluminum plated layer as the outermost surface layer on the second surface side of the steel plate (See Figure 1).
- the first surface of the plated steel sheet is composed of the zinc compound layer or the metal zinc layer
- the second surface of the plated steel sheet is composed of the second aluminum plated layer.
- 10 is a plated steel plate
- 12 is a steel plate
- 14A is a first aluminum plating layer
- 14B is a second aluminum plating layer
- 16 is a zinc compound layer or a metal zinc layer.
- the first surface and the second surface of the plated steel plate according to the present embodiment, and the first surface and the second surface of the steel plate are surfaces facing each other in the thickness direction of the steel plate. In other words, the first surface and the second surface are in a front-to-back relationship.
- the first surface of the plated steel sheet is directed to the upper side in the direction of gravity, and is in contact with the upper mold of the hot press forming mold (the mold disposed on the upper side in the direction of gravity) It is a face.
- the second surface of the plated steel sheet is a surface directed downward in the direction of gravity and in contact with the lower die (the die disposed below the direction of gravity) of the hot press forming die. That is, in the plated steel sheet according to the present embodiment, the first surface in contact with the upper mold is constituted by the zinc compound layer or the metal zinc layer, and the second surface in contact with the lower mold is constituted by the aluminum plating layer.
- the first surface of the plated steel plate in contact with the upper mold is also referred to as the “upper surface”
- the second surface of the plated steel plate in contact with the lower mold is also referred to as the “lower surface”.
- zinc is also referred to as “Zn”, an aluminum plating layer as “Al plating layer”, a zinc oxide film as “ZnO film”, a zinc compound layer or a metal zinc layer as “Zn compound or metal Zn layer”.
- the first aluminum plating layer is "upper Al plating layer”
- the second aluminum plating layer is “lower Al plating layer”
- the zinc oxide film provided on the surface of the first aluminum plating layer is “upper ZnO film”
- the first The zinc compound layer or metal zinc layer provided on the surface of the aluminum plating layer is also referred to as “upper Zn compound layer or upper metal Zn layer”.
- the plated steel plate according to the present embodiment has the above-described configuration and when it is hot press-formed, the sliding faces of both the upper mold and the lower mold of the hot press molding die (hereinafter also referred to as “die”) Suppress the occurrence of wear. And the plated steel plate which concerns on this embodiment was discovered by the knowledge shown below.
- Al-plated steel sheet When hot pressing of a conventional Al-plated steel plate for hot press forming (a plated steel plate provided with an Al-plated layer on both sides of the steel plate), the aluminum of the Al-plated layer reacts with the material of the mold (iron) The die is abraded due to the occurrence of seizing, and adhesion and peeling of a large amount of the intermetallic compound (aluminum adherent) formed by the seizing on the surface of the die.
- Al-plated steel sheet is likely to form an oxide of aluminum on the surface of Al-plated layer and hardly react with the chemical conversion solution of the chemical conversion treatment after hot press forming, so the paintability is poor and the corrosion resistance of the press formed product is Low.
- a zinc phosphate process can be illustrated as a chemical conversion treatment.
- the formation solution of zinc phosphate treatment is mainly composed of primary zinc phosphate and phosphoric acid, and contains cations (such as nickel and manganese).
- cations such as nickel and manganese.
- anions nitrate ion, ⁇ -nitrate ion, fluoride ion, etc.
- organic acids citrate, etc.
- Patent Documents 1 and 2 a plated steel sheet (hereinafter referred to as “the steel sheet having a ZnO film formed on the surface of an Al plated layer provided on both sides of the steel sheet for the purpose of suppressing the wear of the mold and improving the corrosion resistance of the press-formed product
- a ZnO coated Al-coated steel sheet has been proposed. Since the surface of the Al plating layer is covered with the ZnO film, the adhesion of the aluminum adherent to the surface of the die due to the seizure is suppressed, and the gold is coated with gold, because the surface of the Al plating layer is covered with the ZnO film. The coefficient of friction with the surface of the mold is reduced. As a result, wear of the mold is suppressed.
- the Al-coated steel sheet with a ZnO film has high reactivity between ZnO in the ZnO film and a chemical conversion solution for chemical conversion treatment.
- the formation of aluminum oxide on the surface of the Al plating layer is suppressed, and iron and aluminum alloy phases (alloy phases other than aluminum oxide) in the Al plating layer partially react with the chemical conversion solution. Therefore, the paintability is high, and the corrosion resistance of the press-formed product is also improved.
- the high wall surface and the sliding surface of the die sliding with the plated steel plate such as the portions to be the vertical wall portion and the flange portion of the press formed product It takes pressure. Therefore, it was found that when the Al-plated steel sheet is used regardless of the presence or absence of the ZnO film, wear may occur on the sliding surface of the mold. According to the inventors, when the ZnO coating is in direct physical contact between the mold and the aluminum plating layer, wear of the mold can not be avoided. Therefore, I thought that what became a shock absorbing material was needed between the mold and the aluminum plating material.
- the inventors have found that adhesion of a large amount of aluminum adhesive to the surface of the mold causes wear of the mold. On the other hand, it was considered that the adhesion of the appropriate aluminum adhesive to the surface of the mold functions as a shock absorbing material on the surface of the metal, which is effective in reducing the wear of the mold. Then, inventors conducted the test of plating adhesion to the upper mold and the lower mold and found out the following.
- the adhesion amount of aluminum to the mold is different between the upper mold and the lower mold, and in order to suppress the occurrence of wear on the sliding surface of both the upper mold and the lower mold of the hot press molding mold In each of the above, there are suitable coating amounts and surface conditions for each surface.
- the inventors do not need to paint the inner surface of the press-formed product (for example, the surface facing the inner side of the vehicle when the press-formed product is attached to the vehicle in the case of a press-formed product for automobiles) I focused on things. That is, in the Al-coated steel sheet with ZnO film, let the lower surface of the plated steel plate in contact with the lower mold be the inner surface of the press-formed product, and form the ZnO film on the lower surface of the plated steel sheet to improve paintability and impart corrosion resistance. In addition, attention was focused on forming the lower surface of the plated steel with an Al plated layer.
- the inventors formed an aluminum plating layer in which the lower surface of the plated steel sheet in contact with the lower mold is exposed, thereby coagulating the aluminum adherent on the sliding surface of the lower mold. It was found that the amount of adhesion increased moderately and that the aluminum deposit functions as a protective film of the sliding surface of the lower mold. That is, the inventors obtained the following findings. If only the lower surface of the plated steel sheet in contact with the lower mold is made up of the exposed Al plating layer, the aluminum adherent adheres due to the contact between the sliding surface of the lower mold and the Al plating layer, and the sliding of the lower mold An aluminum aggregate layer of appropriate thickness is formed on the surface (see (1) in FIG. 2).
- the sliding surface of the lower mold and the Al plating layer repeatedly slide, whereby adhesion and peeling of the aluminum adherent are repeated on the sliding surface of the lower mold, and aluminum aggregation of an appropriate thickness is performed.
- the adhesion layer is maintained, and the function as a protective film of the sliding surface of the lower mold is maintained (see (2) in FIG. 2).
- 14 indicates an Al plating layer
- 18 indicates a mold
- 14C indicates an aluminum deposit
- 14C-1 indicates a peeled aluminum deposit.
- the inventors of the present invention suffer from wear of the sliding surface of the lower mold of the hot press forming mold. I found it to suppress. And the inventors also found out that the plated steel sheet according to the present embodiment has improved weldability because the ZnO film is not formed on the lower surface.
- the inventors examined the suppression of wear on the sliding surface when the upper mold (the mold disposed on the upper side in the direction of gravity) had a high surface pressure among the molds for hot press molding. .
- the following findings were obtained.
- the Al-plated layer on the upper surface side of the plated steel plate in contact with the upper mold is different from the Al-plated layer on the lower surface side of the plated steel even when subjected to heating by hot press forming. It is hard to produce plating deviation under the influence of the above, and it is hard to produce the generation of thickness unevenness.
- the adhesion amount (coating amount) of the Al plating layer is increased, and aluminum on the surface of the upper die is increased.
- the aluminum deposit functions as a protective film if the amount of deposit of the deposit is increased.
- the adhesion amount of the Al plating layer is increased, the projections on the surface of the Al plating layer become dense, so the surface of the ZnO film also becomes dense according to the surface properties of the Al plating layer. Therefore, when the adhesion amount of the Al plating layer is increased, the surface pressure applied to the sliding surface of the upper mold also decreases.
- the inventors also found out the following. At the time of hot press forming, in the Al plated steel sheet, the ZnO film on the upper surface side may be present at the time of hot press forming. Therefore, before the hot press forming, in addition to the ZnO film, an “upper Zn compound layer or an upper metal Zn layer” to be a ZnO film by heating may be present on the upper surface side of the Al plated steel sheet.
- the inventors in the plated steel plate according to the present embodiment, increase the adhesion amount of the upper Al plating layer to become the outer surface of the press-formed product, and improve the paintability and impart corrosion resistance. It has been found that the wear of the sliding surface of the upper mold can be suppressed even with the ZnO film.
- steel sheet For example, high mechanical strength (for example, tensile strength, bending point, elongation, squeezing, hardness, impact value, fatigue strength, creep strength, etc.) (Means properties related to deformation and fracture)).
- high mechanical strength for example, tensile strength, bending point, elongation, squeezing, hardness, impact value, fatigue strength, creep strength, etc.
- steel plate (steel plate before plating) which realizes the high mechanical strength used for the plated steel plate concerning this embodiment is as follows. The notation of% means mass% unless otherwise noted.
- the steel plate is, by mass%, C: 0.01 to 0.6%, Si: 0.01 to 0.6%, Mn: 0.3 to 3%, P: 0.001 to 0.03%, S : 0.0001 to 0.02%, Cr: 0.001 to 2.5%, Ti: 0.01 to 0.1%, Al: 0.01 to 0.1%, Mo: 0.001 to 1 .5% and B: at least one of 0.0001 to 0.1% and containing the balance Fe and impurities.
- the steel plate is, by mass%, as essential elements, C: 0.01 to 0.6%, Si: 0.01 to 0.6%, Mn: 0.3 to 3%, P It contains 0.001 to 0.03%, S: 0.0001 to 0.02%, and the balance consists of Fe and impurities.
- Cr: 0.001 to 2.5% Ti: 0.01 to 0.1%, Al: 0.01 to 0.1%, Mo: 0.001 to 1.5% and B: at least one of 0.0001 to 0.1% may be contained.
- C is included to secure the target mechanical strength.
- C is less than 0.01%, sufficient improvement in mechanical strength can not be obtained, and the effect of containing C becomes poor.
- C exceeds 0.6%, although it is possible to further harden the steel plate, melt cracking tends to occur. Therefore, the C content is preferably 0.01% or more and 0.6% or less.
- Si is one of the strength improving elements for improving the mechanical strength and, like C, is included to secure the desired mechanical strength.
- Si is less than 0.01%, it is difficult to exhibit the strength improvement effect, and a sufficient improvement in mechanical strength can not be obtained.
- Si is also an oxidizable element. Therefore, when Si exceeds 0.6%, when performing hot-dip aluminum plating, there is a possibility that wettability may fall and non-plating may occur. Therefore, the Si content is preferably 0.01% to 0.6%.
- Mn is one of the strengthening elements for strengthening the steel and is also one of the elements for enhancing the hardenability. Furthermore, Mn is also effective in preventing hot embrittlement due to S which is one of the impurities. When Mn is less than 0.3%, these effects can not be obtained, and the above effects are exhibited at 0.3% or more. On the other hand, if Mn exceeds 3%, the amount of residual ⁇ phase may be too large to lower the strength. Therefore, the Mn content is preferably 0.3% to 3%.
- P is an impurity and is preferably limited to 0.03% or less because it adversely affects the hot workability. More preferably, it limits to 0.02% or less. On the other hand, reducing P more than necessary places a heavy load on the steel making process, so it is preferable to set the lower limit to 0.001%.
- S is an impurity and is preferably limited to 0.02% or less because it adversely affects mechanical properties such as hot workability, ductility, toughness and the like. More preferably, it limits to 0.01% or less. On the other hand, since reducing the load more than necessary puts a heavy load on the steelmaking process, it is preferable to make 0.0001% the lower limit.
- Cr has the effect of suppressing the nitriding reaction (formation of AlN) of Al, which is a competing reaction when Al-Fe alloying the Al plating layer, and enhancing the adhesion between the base material and the plating layer.
- formation of AlN nitriding reaction
- Cr is an atom that influences also the diffusion behavior of Fe and also affects the phase configuration and the form of the alloy layer.
- the lower limit is preferably 0.001%.
- Ti is one of strength strengthening elements, and is also an element that improves the heat resistance of the Al plating layer. When Ti is less than 0.01%, the strength improvement effect and the oxidation resistance improvement effect can not be obtained, and these effects are exhibited at 0.01% or more. On the other hand, if Ti is contained too much, for example, it may form carbides or nitrides, which may soften the steel. In particular, when Ti exceeds 0.1%, there is a high possibility that the desired mechanical strength can not be obtained. Accordingly, the Ti content is preferably 0.01% or more and 0.1% or less.
- Al which is used as a deoxidizing element, adversely affects the plating property because it forms an oxide film.
- the amount of Al is 0.1% or less, the adverse effect is acceptable.
- the content of Al is preferably 0.07% or less.
- making the Al content less than 0.01% imposes a large load on the steel making process, so the lower limit may be 0.01%.
- Mo can be added from the viewpoint of improving hardenability and improving material strength.
- Mo is an extremely expensive element, and a large amount of addition leads to a significant cost increase. Therefore, from the viewpoint of cost reduction, the content of Mo is preferably 1.5% or less.
- setting the amount of Mo to less than 0.001% places a large load on the steel making process, so the lower limit of 0.001% is preferable.
- B acts at the time of hardening and has the effect of improving strength.
- B is less than 0.0001%, such a strength improvement effect is low.
- B exceeds 0.1%, inclusions are formed to cause embrittlement and the fatigue strength may be reduced. Therefore, it is preferable to make B content into 0.0001% or more and 0.1% or less.
- the steel plate may contain other impurities (for example, chemical components such as Cu, Nb, V, etc., oxides, nitrides, etc.) which are mixed in the manufacturing process or the like.
- impurities for example, chemical components such as Cu, Nb, V, etc., oxides, nitrides, etc.
- a steel plate formed of such chemical components can be quenched by heating by hot press forming or the like, and can have a mechanical strength of, for example, about 1500 MPa or more.
- a steel plate having high mechanical strength if it is processed by hot press forming, since hot press forming can be performed in a softened state by heating, it can be easily formed. Further, the steel plate can realize high mechanical strength, and can maintain or improve the mechanical strength even if it is thinned for weight reduction.
- Al plating layer The upper Al plating layer and the lower Al plating layer will be described. Hereinafter, common matters will be described as “Al plating layer”.
- the component composition of the Al plating layer may contain 50% or more of Al.
- Elements other than Al are not particularly limited, but Si may be positively contained for the following reasons.
- the Si content in the Al plating layer is preferably 3 to 15%.
- the Al plating layer prevents the corrosion of the steel plate.
- the Al plating layer does not oxidize on the surface and generate scale (iron oxide) even if it is heated to a high temperature.
- the process of removing the scale, the surface cleaning process, the surface treatment process and the like can be omitted, and the productivity of the molded product is improved.
- the Al plating layer has a boiling point and a melting point higher than those of a plating layer of an organic material and a plating layer of another metal material (for example, a Zn material).
- the Al plating layer can be alloyed with Fe in the steel sheet by heating during hot dipping and hot press forming. Therefore, the Al plating layer is not necessarily formed as a single layer having a constant component composition, but includes a partially alloyed layer (alloy layer).
- the adhesion amount of the upper Al plating layer is preferably 40 to 160 g / m 2 in terms of the amount of Al.
- the adhesion amount of the upper Al plating layer is preferably 40 g / m 2 or more, and more preferably 60 g / m 2 or more.
- the adhesion amount of the upper Al plating layer exceeds 160 g / m 2 , the thickness unevenness of the upper Al plating layer becomes large and the local surface pressure on the sliding surface of the upper die becomes large. As a result, the sliding surface of the upper die tends to wear. Therefore, 160 g / m ⁇ 2 > or less is preferable and, as for the upper limit of the adhesion amount of upper side Al plating layer, 120 g / m ⁇ 2 > or less is more preferable.
- the adhesion amount of the lower Al plating layer is preferably 20 to 100 g / m 2 in terms of the amount of Al.
- the adhesion amount of the lower Al plating layer is preferably 20 g / m 2 or more.
- the adhesion amount of the lower Al plating layer is more preferably 40 g / m 2 or more.
- the adhesion amount of the lower Al plating layer is more than 100 g / m 2 , a large amount of aluminum adherent adheres to the sliding surface of the lower mold, and wear of the sliding surface of the lower mold occurs. The trend is rising. for that reason.
- the adhesion amount of the lower Al plating layer is preferably 100 g / m 2 or less, and by setting the adhesion amount of the lower Al plating layer to 80 g / m 2 or less, appropriate plating adhesion on the mold surface is obtained. It is more preferable that the amount be 80 g / m 2 or less because the wear suppressing effect of the sliding surface of the lower mold can be obtained.
- the upper aluminum plating layer is a state in which the upper ZnO film is formed on the surface, and from the point of suppressing the wear of the sliding surface of the upper mold, an appropriate aluminum adherent on the sliding surface of the upper mold It is good to adhere Therefore, the adhesion amount of the upper aluminum plating layer is preferably large (thick coating is good).
- the adhesion amount of the lower aluminum plating layer is preferably small (that is, the light coating is good). Therefore, the adhesion amount of the upper aluminum plating layer is preferably larger than the adhesion amount of the lower aluminum plating layer.
- the adhesion amount of the Al plating layer of the steel plate before hot press forming is determined from (plating thickness x 2.7) by measuring the plating thickness described in, for example, JIS H 8672: 1995 (hot-dip aluminum plating test method) .
- the plating thickness As a specific method of measuring the plating thickness, the cross section of the target material is mirror-polished, the cross section is observed with an electron microscope (for example, observed at 1000 times), and the plating thickness is equally spaced from both ends within the same field of view. Measure the five points, and take the average value as the plating thickness at that point.
- the term “plated layer” as used herein includes the thickness of the Al—Fe alloy layer formed at the interface between the plated layer and the base layer.
- the upper Zn compound layer or the upper metal Zn layer is a layer that becomes the upper ZnO film or the upper ZnO film during hot press forming. Before hot press forming, the plated steel sheet is heated in an oxidizing atmosphere. At this time, the upper Zn compound layer or the upper metal Zn layer other than the upper ZnO film is oxidized to become the upper ZnO film.
- the upper Zn compound layer or the upper metal Zn layer other than the upper ZnO film may be of any type as long as it is oxidized to become the upper ZnO film. Examples of Zn compound layers other than the upper ZnO film include a zinc phosphate layer and a Zn-based metal soap layer.
- the Zn compound and the metal Zn may be mixed with a resin which is burnt off by heating to form an upper Zn compound layer or a metal Zn layer other than the upper ZnO film.
- the amount of Zn contained in the upper Zn compound layer or the metal Zn layer is adjusted according to the amount of upper ZnO film deposited on the target product.
- the upper ZnO film is a film which is in contact with the upper mold and serves as the outer surface of the press-formed product.
- the method for forming the upper 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 the upper ZnO film is preferably 0.4 to 4.0 g / m 2 in terms of the amount of Zn from the viewpoint of the corrosion resistance of the product.
- the adhesion amount of the upper ZnO film is 0.4 g / m 2 or more in terms of the amount of Zn, the corrosion resistance of the press-formed product is enhanced. Therefore, the lower limit of the adhesion amount of the upper ZnO film is preferably 0.4 g / m 2 or more in terms of the Zn amount.
- the upper limit of the adhesion amount of the upper ZnO film is preferably 4.0 g / m 2 in terms of the amount of Zn.
- the upper limit of the adhesion amount of the upper ZnO film is more preferably 2.0 g / m 2 in terms of the amount of Zn.
- the adhesion amount of the upper Al plating layer is low, it is desirable that the adhesion amount of the upper ZnO film is high within the above range.
- the thickness of the ZnO film is measured, and it is determined by converting it to the adhesion amount by (ZnO film thickness ⁇ 2).
- the cross section is mirror-polished, cross-sectional observation (for example, 10000 times) including the ZnO layer and the plating layer in the vicinity of the surface is performed with an electron microscope.
- the thickness of the ZnO film is measured at five points, and the average value is taken as the thickness of the ZnO film at that point.
- the existence of ZnO layers is observed using an energy dispersive X-ray analyzer (cross-section observation including a ZnO layer and a plating layer near the surface by an electron microscope) (Energy Dispersive X).
- Energy Dispersive X The presence or absence of the upper Zn compound layer or the upper metal Zn layer of the steel sheet before hot press forming can be confirmed by confirmation with -ray Spectrometer, EDX or EDS).
- the method for producing a hot press-formed product according to the present embodiment is a method for producing a hot press-formed product by hot press forming the plated steel sheet according to the present embodiment.
- the plated steel plate is heated, and then pressed by a die having an upper die and a lower die to perform hot press forming.
- the upper mold comes in contact with the first surface of the plated steel sheet (the surface of the upper ZnO film), and the lower mold forms the second surface (lower The plated steel sheet is hot-pressed so as to be in contact with the surface of the side Al plating layer).
- wear of the lower die can be suppressed even if the press surface pressure is increased.
- the life extension of the lower mold can be compatible with the mass production of the press-formed product.
- the plated steel sheet is heated (thermally) with the first surface of the plated steel sheet facing upward in the direction of gravity and the second surface facing downward in the direction of gravity. It is preferable to perform heating before pressing during press molding.
- heating in hot press forming is performed in this state, the wear of the lower mold can be suppressed even if unevenness in thickness occurs due to the shift of the lower Al plating layer constituting the second surface of the plated steel sheet.
- the life extension of the lower mold can be compatible with the mass production of the press-formed product.
- the upper mold be a die and the lower mold be a punch.
- the outer surface of a press-formed product for a car is the inner surface (the face facing the inner side of the vehicle when the press-formed product is attached to the vehicle)
- Higher corrosion resistance is required compared to.
- the press-formed product is painted to obtain high corrosion resistance. In the case of coating a press-formed product, if a ZnO film is present on the surface to be coated, it is easy to coat.
- the press-formed product is convex toward the outer surface of the press-formed product.
- the mold disposed on the convex side of the press-formed product is a die. Therefore, in order to make the outermost surface layer of the coated surface of the press-formed product as the product into the upper ZnO film, it is preferable to use the upper mold as a die and the lower mold as a punch.
- the mold can have a holder.
- the holder is, for example, a member that holds the plated steel plate of the portion that becomes the flange portion when hot press forming is performed.
- Hot press forming using a holder is drawn.
- the draw forming has a higher pressing surface pressure than the bending without using a holder.
- the method of manufacturing a hot press-formed product according to the present embodiment can suppress wear of the lower die and realize mass production of the press-formed product even if the press surface pressure is increased, and therefore can be applied to draw forming as well. . That is, mass production of molded articles by drawing can be realized.
- the hot press-formed product in the hot press-forming, for example, after performing blanking (punching) as necessary, the plated steel plate is softened by heating to a high temperature. Then, using a mold, the softened plated steel sheet is pressed and formed, and then cooled. As described above, in the hot press forming, the subsequent pressing can be easily performed by once softening the plated steel sheet. In addition, the hot press-formed press-formed product is quenched by heating and cooling to be a formed product having a high tensile strength of about 1500 MPa or more.
- a heating method for hot press forming it is possible to adopt a heating method by infrared heating, electric heating, induction heating or the like in addition to a usual electric furnace or radiant tube furnace.
- the heating is performed in an oxidizing atmosphere.
- this heating causes the upper Zn compound layer or the upper metal Zn layer on the surface of the plated steel sheet to be the upper It becomes a ZnO film.
- the Al plating layer of the plated steel sheet melts when heated to the melting point or higher, and at the same time, the Al phase changes to an Al-Fe alloy phase and an Al-Fe-Si alloy phase by interdiffusion with Fe.
- the melting points of the Al-Fe alloy phase and the Al-Fe-Si alloy phase are high, about 1150 ° C.
- the Al plating layer When hot pressed, the Al plating layer becomes an aluminum-iron alloy layer.
- the state of the aluminum-iron alloy layer preferable as a press-formed product is a state in which the surface is alloyed, and a state in which the Fe concentration in the alloy phase is not high. If the Fe concentration on the surface of the Al plating layer is 10% by mass or more, it is regarded as an aluminum-iron alloy layer. If non-alloyed Al remains, only this portion is rapidly corroded, corrosion resistance after coating is deteriorated, and coating film swelling is extremely likely to occur, which is not preferable. In order to reliably prevent the film from swelling, it is desirable that the Fe concentration on the surface of the aluminum-iron alloy layer is 20% by mass or more.
- the Fe concentration in the alloy phase becomes too high, the corrosion resistance of the alloy phase itself is reduced, the corrosion resistance after painting is deteriorated, and the coating film is easily swollen.
- the Fe concentration on the surface of the aluminum-iron alloy layer is 80 mass% or less.
- the Fe concentration on the surface of the aluminum-iron alloy layer is 60 mass% or less. That is, the corrosion resistance of the alloy phase depends on the Fe concentration in the alloy phase. Therefore, in order to improve the corrosion resistance after coating, the state of alloying is controlled by the amount of Al adhesion and the heating condition.
- the average temperature rising rate in the temperature range from 50 ° C. to a temperature 10 ° C. lower than the highest achieved plate temperature to 10 to 300 ° C./sec.
- the average temperature rising rate influences the productivity in hot press forming of the plated steel sheet.
- the average temperature rising rate is less than 10 ° C./second, it takes time to soften the plated steel sheet for hot press forming.
- the temperature exceeds 300 ° C., although the softening is rapid, the alloying of the Al plating layer may significantly cause powdering.
- a general average temperature rise rate is about 5 ° C./second in the case of atmosphere heating.
- An average heating rate of 100 ° C./sec or more can be achieved by electric heating or high frequency induction heating.
- the structure of a high strength (high hardness) press-formed product obtained by hot press forming has a high proportion of martensitic structure.
- a target temperature of heating for hot press forming is usually a temperature of about 900 to 950 ° C. in many cases.
- the maximum temperature to be reached is not particularly limited, but if it is less than 850 ° C., sufficient hardening hardness is hardly obtained, which is not preferable.
- the Al plating layer needs to be an Al-Fe alloy layer. From these viewpoints, it is preferable to set the highest temperature to 850 ° C.
- the upper limit of the maximum achievable temperature depends on the temperature rise rate and the amount of adhesion of Al, but it can not be generally stated, but the maximum achievable temperature may be 1100 ° C. or less even in consideration of economics. preferable.
- the plated steel plate heated to high temperature is press-formed with a metal mold
- an example of the usual process from manufacture of a plated steel plate to hot press forming is as follows. First, prepare a plated steel plate coil in which the plated steel plate is wound in a coil shape (see FIG. 3 (1): in FIG. 3, 10 is a plated steel plate, 12 is a steel plate, 14A is a first aluminum plated layer, 14B is a second)
- the aluminum plating layer, 16 is a zinc compound layer or a metal zinc layer
- 20 shows a plated steel plate coil.
- the first surface (the surface of the upper ZnO film) of the plated steel sheet faces the outside
- the second surface the surface of the lower Al plated layer
- the plated steel plate is drawn out from the plated steel plate coil and blanked (punched) (FIGS. 3 (2) to 3 (3): 22 in FIG. 3 indicates a blanking material).
- the first surface of the blanking material (surface of the upper ZnO film) faces upward,
- the blanking material is heated in the heating furnace with the second surface of the pre-loading material (the surface of the lower Al plating layer) facing downward (FIG. 3 (4): 24 in FIG. 3 is the heating furnace) Show).
- the first surface of the plated steel sheet (the surface of the upper Zn compound layer or the upper metal Zn layer) faces outward, and the second surface (the lower surface), as shown in an example of a typical process from the production of the plated steel sheet to hot press forming.
- the plated steel plate With the surface of the side Al plated layer facing inward, the plated steel plate is drawn out from the plated steel plate coil wound with the plated steel plate (that is, the plated steel plate is drawn from the upper side of the plated steel plate coil). Then, after blanking the drawn plated steel sheet, the upper surface mold and the lower surface mold are carried out even if the press surface pressure is increased by performing hot press forming without inverting the obtained blanking material. Both the wear of both are suppressed, and mass production of press-formed products is realized.
- the automobile part according to the present embodiment is an automobile part configured by a hot press-formed product.
- the automobile part has a hardened structure and has a steel plate bent in a convex manner on the first surface side, a first aluminum-iron alloy layer provided on the first surface of the steel plate, and a first aluminum-iron alloy layer A zinc oxide film provided on the surface of the steel sheet, a paint layer provided on the surface of the zinc oxide film, a second aluminum-iron alloy layer provided on the second surface of the steel plate, And an aluminum oxide film provided on the surface of the alloy layer (see FIG. 4).
- 100 is an automobile part
- 121 is a steel plate
- 141A is a first aluminum-iron alloy layer
- 141B is a second aluminum-iron alloy layer
- 142B is an aluminum oxide film
- 161 is a zinc oxide film
- 181 is a paint Indicates a layer.
- the automobile part according to the present embodiment is a press-formed product in which the coated layer is formed after the plated steel sheet according to the present embodiment is hot-pressed.
- the first surface (surface of the upper ZnO film) of the hot-pressed plated steel sheet is the surface facing the convex surface of the automobile part
- the second surface (lower Al plating layer Changes to an aluminum-iron alloy layer, and the surface of the layer on which the aluminum oxide film is formed on the surface) is the surface facing the concave surface of the automobile part, and a coated layer is formed on the first surface of the plated steel sheet It is an article.
- the convex side surface of the automobile part refers to the surface facing the outside of the automobile when the automobile part is attached to the automobile.
- the convex surface is the outer surface of the part having a closed cross section.
- the concave surface of the automobile part is the surface facing the inside of the automobile when the automobile part is attached to the automobile.
- the concave surface is the inner surface of the part having a closed cross section.
- the hardened structure of the steel sheet includes a martensitic structure or a tempered martensitic structure.
- the quenched structure may include a bainite structure, a bainite structure, a ferrite structure, a cementite structure, and the like.
- the aluminum-iron alloy layer is obtained by alloying an Al plating layer between heating before hot press forming and hot press forming.
- the aluminum-iron alloy layer is all alloyed from the steel plate side to the surface side.
- the aluminum oxide film gets in the way of painting but has corrosion resistance. For this reason, the second surface does not need to be painted.
- the thickness of the aluminum oxide film formed during heating and hot press forming is, for example, 1 ⁇ m depending on the manufacturing conditions.
- a center pillar outer, a door outer, a roof rail outer, a side panel, a fender etc. are mentioned, for example. Then, these automobile parts are attached to the automobile such that the “surface on which the upper ZnO film is formed” side faces the outside of the automobile (for example, so as to be exposed from the vehicle).
- Comparative Examples 1 to 4 Cold-rolled steel plate having the thickness shown in Table 1 (mass%, C: 0.21%, Si: 0.12%, Mn: 1.21%, P: 0.02%, S: 0.012%, Al was plated on both sides of Ti: 0.02%, B: 0.03%, Al: 0.04%, balance: Fe and impurities) by the Zenzimer method.
- the annealing temperature was about 800 ° C.
- the Al plating bath contained 9% of Si, and also contained Fe eluted from the cold-rolled steel sheet.
- Examples 1 to 7 A specimen of a plated steel sheet is obtained in the same manner as in Comparative Example 1 except that the adhesion amount of the first Al plating layer, the second Al plating layer, and the first ZnO film is changed, and the second ZnO film is not formed.
- the same effect can be obtained by forming the ZnO film directly on the Al plating layer or by oxidizing the upper Zn compound or metal Zn layer other than the ZnO film.
- the hot lubricity evaluation apparatus shown in FIG. 5 includes a near infrared heating furnace 101 and a mold including an upper mold 102A and a lower mold 102B.
- the upper mold 102A and the lower mold 102B have projections with a width of 10 mm extending in a direction perpendicular to the drawing direction of the plated steel plate, and sandwiching the test material with the top surfaces of the projections. Apply a predetermined pressing load.
- the hot lubricity evaluation apparatus is also provided with a plated steel plate heated by the near infrared heating furnace 101 and a thermocouple (not shown) for measuring the temperature of the plated steel plate when sandwiched by a mold.
- 10 shows the test material of a plated steel plate in FIG. 30 mm ⁇ in a nitrogen atmosphere by the near-infrared heating furnace 101 with the surface side of the test material on which the first ZnO film is formed facing upward using the hot lubricity evaluation apparatus shown in FIG. After heating the specimen of 500 mm at 920 ° C., the specimen which has become about 700 ° C.
- the amount of wear of the mold was measured by analyzing the surface shape difference of “the mold of the apparatus for measuring hot lubricity” before and after the evaluation test of hot lubricity. Specifically, the profile of the mold surface in the sliding portion before and after sliding was measured using a contact type shape measuring machine to measure the amount of wear of each of the upper and lower molds. .
- Table 1 shows the details of each example and each comparative example in a list.
- the wear of the sliding surface of the lower mold can be reduced by forming the lower surface (second surface) of the plated steel sheet in contact with the lower mold with the second Al plated layer It was confirmed. In particular, it was confirmed that the wear of the sliding surface of the lower mold can be further reduced by setting the adhesion amount of the second Al plating layer to 20 to 100 g / m 2 .
- the upper surface (first surface) of the plated steel plate in contact with the upper mold is constituted of a ZnO film, and the adhesion amount of the lower Al plating layer is "40 to 160 g / m 2 ". It was confirmed that the wear of the sliding surface of the upper mold can be reduced by carrying out.
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Abstract
Description
ところで、一般に非めっき材やめっき鋼板を使用して熱間プレス成形したとき、プレス成形品の縦壁部及びフランジ部となる部分等、めっき鋼板が摺動する熱間プレス成形用金型の摺動面に摩耗が発生する。このため、熱間プレス成形の高面圧部においては金型の摺動面に生じる摩耗対応として、金型手入れが必要である。特許文献2~3のめっき鋼板により金型摩耗が軽減されることが期待されたが、特許文献2~3をもってしても他の非めっき材やめっき鋼板と同様に金型摩耗を解決できなかった。
また、従来、熱間プレス成形用金型の課題として、上金型及び下金型の各々磨耗対策について検討されてはいないのが現状である。
また、他の本開示の課題は、このめっき鋼板を使用し、熱間プレス成形用金型の上金型および下金型の両方の摺動面の摩耗の発生を抑制するめっき鋼板コイル、熱間プレス成形品の製造方法、および、熱間プレス成形品の製造方法により製造したプレス成形品を用いた自動車部品を提供することである。
鋼板と、
前記鋼板の第一面上に設けられた第一アルミめっき層と、
前記第一アルミめっき層の表面上に設けられた亜鉛化合物層または金属亜鉛層と、
前記鋼板の第二面上かつ最表面に設けられた第二アルミめっき層と、
を有するめっき鋼板。
<2>
前記第一アルミめっき層の付着量が、Al量換算で40~160g/m2である<1>に記載のめっき鋼板。
<3>
前記第二アルミめっき層の付着量が、Al量換算で20~100g/m2である<1>又は<2>に記載のめっき鋼板。
<4>
前記第一アルミめっき層の付着量が、前記第二アルミめっき層の付着量よりも多い<1>~<3>のいずれか1項に記載のめっき鋼板。
<5>
<1>~<4>のいずれか1項のめっき鋼板が巻かれためっき鋼板コイルであって、
前記めっき鋼板の前記第一面が外側を向き、前記第二面が内側を向いているめっき鋼板コイル。
<6>
<1>~<4>のいずれか1項のめっき鋼板を加熱した後、上金型及び下金型を有する金型によりプレスして、熱間プレス成形する熱間プレス成形品の製造方法であって、
前記めっき鋼板の前記第一面を重力方向上側に向け、前記第二面を重力方向下側に向けた状態で、前記めっき鋼板のプレスを行う熱間プレス成形品の製造方法。
<7>
前記めっき鋼板の前記第一面を重力方向上側に向け、前記第二面を重力方向下側に向けた状態で、前記めっき鋼板の加熱を行う<6>に記載の熱間プレス成形品の製造方法。
<8>
前記上金型がダイであり、下金型がパンチである<6>又は<7>に記載の熱間プレス成形品の製造方法。
<9>
前記金型が、前記めっき鋼板を押えるホルダーを有する<6>~<8>のいずれか1項に記載の熱間プレス成形品の製造方法。
<10>
焼入れ組織を有し、第一面側に凸に曲がった鋼板と、
前記鋼板の第一面上に設けられた第一アルミ-鉄合金層と、
前記第一アルミ-鉄合金層の面上に設けられた酸化亜鉛皮膜と、
前記酸化亜鉛皮膜の面上に設けられた塗装層と、
前記鋼板の第二面上に設けられた第二アルミ-鉄合金層と、
前記第二アルミ-鉄合金層の面上に設けられた酸化アルミ皮膜と、
を有する自動車部品。
また、本開示によれば、このめっき鋼板を使用し、熱間プレス成形用金型の上金型および下金型の両方の摺動面の傷の発生を抑制するめっき鋼板コイル、熱間プレス成形品の製造方法、および、熱間プレス成形品の製造方法により製造したプレス成形品を用いた自動車部品を提供することができる。
以下に添付図面を参照しながら、本開示の好適な実施の形態について詳細に説明する。なお、本明細書及び図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複説明を省略する場合がある。
本開示の一実施形態に係るめっき鋼板について説明する。
本実施形態に係るめっき鋼板は、鋼板と、鋼板の第一面上に設けられた第一アルミめっき層と、第一アルミめっき層の表面上に設けられた亜鉛化合物層または金属亜鉛層と、鋼板の第二面上かつ最表面に設けられた第二アルミめっき層と、を有する。本実施形態に係るめっき鋼板は、亜鉛化合物層または金属亜鉛層を鋼板の第一面側の最表面層として、第二アルミめっき層を鋼板の第二面側の最表面層として有している(図1参照)。つまり、めっき鋼板の第一面は亜鉛化合物層または金属亜鉛層で構成され、めっき鋼板の第二面は第二アルミめっき層で構成されている。
なお、図1中、10はめっき鋼板、12は鋼板、14Aは第一アルミめっき層、14Bは第二アルミめっき層、16は亜鉛化合物層または金属亜鉛層を示す。
めっき鋼板の表面に汚れ防止又は洗浄のために油脂が塗布されている場合、油脂は無いものとみなす。そういった油脂は熱間プレス成形の前に実施する加熱で無くなり、製品への影響も無いからである。
つまり、本実施形態に係るめっき鋼板は、上金型と接触する第一面を亜鉛化合物層または金属亜鉛層で構成し、下金型と接触する第二面をアルミめっき層で構成する。
また、亜鉛を「Zn」、アルミめっき層を「Alめっき層」、酸化亜鉛被膜を「ZnO皮膜」、亜鉛化合物層または金属亜鉛層を「Zn化合物または金属Zn層」とも称する。第一アルミめっき層を「上側Alめっき層」、第二アルミめっき層を「下側Alめっき層」、第一アルミめっき層の表面上に設けられる酸化亜鉛皮膜を「上側ZnO皮膜」、第一アルミめっき層の表面上に設けられる亜鉛化合物層または金属亜鉛層を「上側Zn化合物層層または上側金属Zn層」とも称する。
また、Alめっき鋼板は、Alめっき層の表面にアルミの酸化物が形成され易く、熱間プレス成形後の化成処理の化成液と反応しにくいため、塗装性が悪く、プレス成形品の耐食性が低い。
なお、化成処理にはリン酸亜鉛処理が例示できる。リン酸亜鉛処理の化成液は、第一リン酸亜鉛及びリン酸が主成分であり、カチオン(ニッケル及びマンガン等)を含む。また、リン酸亜鉛処理の化成液には、アニオン(硝酸イオン、α硝酸イオン、フッ化物イオン等)、有機酸(クエン酸等)などが添加されていてもよい。
ZnO皮膜付きAlめっき鋼板は、Alめっき層の表面がZnO皮膜で覆われているため、熱間プレス成形したときでも、焼き付きによるアルミ凝着物の金型の表面への凝着が抑えられ、金型の表面との摩擦係数が低減される。その結果、金型の磨耗が抑制される。
また、ZnO皮膜付きAlめっき鋼板は、ZnO皮膜のZnOと化成処理の化成液との反応性が高い。これに加え、Alめっき層の表面でのアルミ酸化物の生成が抑えられ、Alめっき層中の鉄及びアルミの合金相(アルミ酸化物以外の合金相)も一部化成液と反応する。そのため、塗装性が高く、プレス成形品の耐食性も向上する。
発明者らが推測するに、ZnO皮膜をはさんでも金型とアルミめっき層が物理的に直接接触すると,金型の摩耗は避けられない。そこで、金型とアルミめっき材の間に緩衝材となるものが必要だと考えた。
なお、図2中、14はAlめっき層を示し、18は金型を示し、14Cはアルミ凝着物層を示し、14C-1は剥離したアルミ凝着物を示す。
そして、発明者らは、本実施形態に係るめっき鋼板は、下面にZnO皮膜が形成されていないことから、溶接性も高まることも見出した。
めっきをのせる鋼板(めっき前の鋼板)は、例えば、高い機械的強度(例えば、引張強さ、伏点、伸び、絞り、硬さ、衝撃値、疲れ強さ、クリープ強さなどの機械的な変形及び破壊に関する諸性質を意味する。)を有する鋼板が好ましい。本実施形態に係るめっき鋼板に使用される高い機械的強度を実現する鋼板(めっき前の鋼板)の一例は、以下の通りである。なお、%の表記は、特に断りがない場合は質量%を意味する。
具体的には、例えば、鋼板は、質量%で、必須元素として、C:0.01~0.6%、Si:0.01~0.6%、Mn:0.3~3%、P:0.001~0.03%、S:0.0001~0.02%を含有し、かつ、残部がFe及び不純物からなる。そして、必要に応じて、選択元素として、Cr:0.001~2.5%、Ti:0.01~0.1%、Al:0.01~0.1%、Mo:0.001~1.5%,及び、B:0.0001~0.1%のうちの少なくとも1以上を含有してよい。
上側Alめっき層及び下側Alめっき層について説明する。以下、共通する事項については「Alめっき層」と称して説明する。
Alめっき層の表面にごく薄い(たとえば厚さ0.1μm以下)酸化Al皮膜が存在する場合がある。この場合、酸化Al皮膜は無いものとみなす。なぜなら、熱間プレス成形前のこの酸化Al皮膜は、熱間プレス成形と熱間プレス成形品に特に影響しないからである。
一方で、上側Alめっき層の付着量を160g/m2超えにすると、上側Alめっき層の厚さムラが大きくなって上金型の摺動面への局所的な面圧が大きくなる箇所が生じ、上金型の摺動面の磨耗が発生する傾向が高まる。そのため、上側Alめっき層の付着量の上限は、160g/m2以下が好ましく、120g/m2以下がより好ましい。
一方で、下側Alめっき層の付着量を100g/m2超えにすると、下金型の摺動面へ多量のアルミ凝着物が凝着し、下金型の摺動面の磨耗が発生する傾向が高まる。そのため。下側Alめっき層の付着量を100g/m2以下が好ましい、また、下側Alめっき層の付着量を80g/m2以下にすることで、金型面への適度なめっき凝着となり、下金型の摺動面の磨耗抑制効果が得られるため、80g/m2以下であることがより好ましい。
よって、上側アルミめっき層の付着量は、下側アルミめっき層の付着量よりも多いことが好ましい。
熱間プレス成形後の鋼板から、熱間プレス成形前の鋼板のAlめっき層の付着量を推定する方法としては,例えば、電子顕微鏡による表面付近のめっき層を含む断面観察を用いる。この時の断面の鏡面研磨では、2%ナイタールでエッチング処理を行うことで、めっき層とマルテンサイト組織となっている基層とを区別できるようになる。表面のめっき層と基層を含む断面観察:たとえば1000倍の断面観察により,観察視野内のAlめっきおよびAlの拡散層の平均厚さ、tAlを測定し、以下の換算式(1)を用いて熱間プレス成形前の鋼板のAlめっき層の付着量を推定する.
式(1)Alめっき層の付着量(g/m2)=(tAl(μm)-5)×3(g/μm・m2)
上側Zn化合物層または上側金属Zn層は、上側ZnO皮膜、又は、熱間プレス成形時に上側ZnO皮膜になる層である。熱間プレス成形の前にめっき鋼板は酸化雰囲気で加熱される。このとき上側ZnO皮膜以外の上側Zn化合物層または上側金属Zn層は酸化されて上側ZnO皮膜になる。上側ZnO皮膜以外の上側Zn化合物層または上側金属Zn層は酸化して上側ZnO皮膜になるのであれば特に種類は問わない。上側ZnO皮膜以外のZn化合物層には、リン酸亜鉛層、Zn系金属石鹸層等が例示できる。また、Zn化合物と金属Znは加熱により燃えて無くなる樹脂と混合し、上側ZnO皮膜以外の上側Zn化合物層または金属Zn層としてもよい。上側Zn化合物層または金属Zn層に含まれるZnの量は、目標とする製品の上側ZnO皮膜の付着量に応じて調節する。
上側ZnO皮膜は、上金型と接触する面であって、プレス成形品の外側の面となる皮膜である。
上側ZnO皮膜の付着量がZn量換算で4.0g/m2を超える場合には、Alめっき層及びZnO皮膜の厚みが厚くなり過ぎ、溶接性、塗料密着性が低下することがある。そのため、上側ZnO皮膜の付着量の上限は、Zn量換算で4.0g/m2が好ましい。製品の生産性を考慮すると、上側ZnO皮膜の付着量の上限は、Zn量換算で2.0g/m2がより好ましい。
金型摩耗の観点では上側Alめっき層の付着量が低い場合、上側ZnO皮膜の付着量は上記範囲の中でも高いことが望ましい。
なお、熱間プレス成形前のZnO皮膜の付着量の測定方法としては、例えば、ZnO皮膜厚を測定し、(ZnO皮膜厚×2)で付着量に換算することで求める。具体的なZnO皮膜厚を求める方法としては、断面を鏡面研磨し、電子顕微鏡による表面付近のZnO層およびめっき層を含む断面観察(例えば10000倍)を行い、同一視野内で両端から等間隔にZnO皮膜厚さを5点測定し,その平均値をもってその箇所のZnO皮膜厚とする。
また、熱間プレス成形後の鋼板、及び、製品においても、電子顕微鏡による表面付近のZnO層およびめっき層を含む断面観察を用い、ZnO層の存在をエネルギー分散型X線分析装置(Energy Dispersive X-ray Spectrometer,EDXまたはEDS)で確認することにより、熱間プレス成形前の鋼板の上側Zn化合物層または上側金属Zn層の有無を確認することができる。
本実施形態に係る熱間プレス成形品の製造方法は、本実施形態に係るめっき鋼板を熱間プレス成形して、熱間プレス成形品の製造する方法である。
まず、めっき鋼板をコイル状に巻かれためっき鋼板コイルを準備する(図3(1)参照:図3中、10はめっき鋼板、12は鋼板、14Aは第一アルミめっき層、14Bは第二アルミめっき層、16は亜鉛化合物層または金属亜鉛層、20はめっき鋼板コイルを示す。)。ここで、めっき鋼板コイルは、めっき鋼板の第一面(上側ZnO皮膜の表面)が外側を向き、第二面(下側Alめっき層の表面)が内側を向いている。
次に、めっき鋼板コイルから、上出しで、めっき鋼板を引き出し、ブランキング(打ち抜き加工)する(図3(2)~図3(3):図3中22はブランキング材を示す)。
次に、ブランキング材を反転させずに(ブランキング材の第一面及び第二面の位置を変えずに)、ブランキング材の第一面(上側ZnO皮膜の表面)が上側を向き、プレンキング材の第二面(下側Alめっき層の表面)が下側を向いたままの状態で、加熱炉で、ブランキング材を加熱する(図3(4):図3中24は加熱炉を示す。)。
次に、同様に、ブランキング材を反転させずに、ブランキング材をホルダーで上金型としてのダイに押さえ付けた状態で、上金型としてのダイ及び下金型としてのパンチの一対の金型により、加熱されたブランキング材をブレスし、成形及び焼入れする(図3(5):図3中、26は金型、26Aは上金型(ダイ)、26Bは下金型(パンチ)、26Cはホルダーを示す)。
そして、金型から取り外すことで、目的とするプレス成形が得られる(図3(6):図3中28はプレス成形品を示す)。
本実施形態に係る自動車部品は、熱間プレス成形品で構成された自動車部品である。そして、自動車部品は、焼入れ組織を有し、第一面側に凸に曲がった鋼板と、鋼板の第一面上に設けられた第一アルミ-鉄合金層と、第一アルミ-鉄合金層の面上に設けられた酸化亜鉛皮膜と、酸化亜鉛皮膜の面上に設けられた塗装層と、鋼板の第二面上に設けられた第二アルミ-鉄合金層と、第二アルミ-鉄合金層の面上に設けられた酸化アルミ皮膜と、を有している(図4参照)。
なお、図4中、100は自動車部品、121は鋼板、141Aは第一アルミ-鉄合金層、141Bは第二アルミ-鉄合金層、142Bは酸化アルミ皮膜、161は酸化亜鉛皮膜、181は塗装層を示す。
アルミ-鉄合金層は熱間プレス成形前の加熱と熱間プレス成形の間にAlめっき層が合金化されたものである。アルミ-鉄合金層は鋼板側から表面側まで全て合金化されている。第二アルミ-鉄合金層の表面側には酸化アルミ皮膜がある。酸化アルミ皮膜は塗装の邪魔になるが、耐食性を備える。このため、第二面側は塗装の必要が無い。加熱と熱間プレス成形の間に生成される酸化アルミ皮膜の厚さは、製造条件にもよるが、例えば1μmである。
表1に示す板厚の冷延鋼板(質量%で、C:0.21%、Si:0.12%、Mn:1.21%、P:0.02%、S:0.012%、Ti:0.02%、B:0.03%、Al:0.04%、残部:Fe及び不純物)の両面に、ゼンジマー法でAlめっきした。焼鈍温度は約800℃とし、Alめっき浴はSiを9%含有し、他に冷延鋼板から溶出するFeを含有していた。めっき後のAlめっき層の付着量(目付量)をガスワイピング法で調整し、冷延鋼板の両面に形成する第一Alめっき層及び第二Alめっき層の付着量(目付量)を表1に示す付着量とした後、冷却した。その後、第一Alめっき層上に、薬液(シーアイ化成(株)社製nanotek slurry、酸化亜鉛粒の粒径=70nm)をロールコーターで塗布し、約80℃で焼きつけ、表1に示す付着量の第一ZnO皮膜を形成した。同様にして、第二Alめっき層上に、表1に示す付着量の第二ZnO皮膜を形成した。
このようにして、めっき鋼板の供試材を得た。
第一Alめっき層、第二Alめっき層、及び第一ZnO皮膜の付着量を変更し、第二ZnO皮膜を形成しない以外は、比較例1と同様にして、めっき鋼板の供試材を得た。ZnO皮膜は、直接Alめっき層の上に配置する他、ZnO皮膜以外の上側Zn化合物または金属Zn層を酸化させて生成しても、同様の効果が得られる。
上記のようにして製造しためっき鋼板の供試材の特性を、次に示す方法で評価した。なお、920℃に加熱する際の平均昇温速度は、7.5℃/秒とした。
図5に示す熱間潤滑性の評価装置を使用して、めっき鋼板の供試材の熱間潤滑性を評価した。図5に示す熱間潤滑性の評価装置は、近赤外線加熱炉101と、上金型102A及び下金型102Bからなる金型とを備えている。上金型102A及び下金型102Bは、めっき鋼板の引き抜き方向に直交する方向に伸びた幅10mmの凸部を有しており、互いの凸部の頂面で供試材を挟み込むことで、所定の押付け荷重をかける。また、熱間潤滑性の評価装置には、近赤外線加熱炉101で加熱しためっき鋼板、及び、金型で挟み込むときのめっき鋼板の温度を測定するための熱電対(不図示)も設けられている。なお、図5中、10はめっき鋼板の供試材を示す。
図5に示す熱間潤滑性の評価装置を用いて、供試材の第一ZnO皮膜が形成された面側を上側に向けた状態で、近赤外線加熱炉101により、窒素雰囲気で、30mm×500mmの供試材を920℃加熱した後、約700℃となった供試材を、上金型102A及び下金型102Bからなる金型で3kNの押付け荷重をかけつつ(つまり供試材を金型に摺動させつつ)、引き抜いて引抜き荷重を測定した。なお、引抜き長さは100mm,引抜き速度は40mm/sとした。そして、熱間摩擦係数(=(引き抜き荷重)/(押付け荷重))を求めた。
金型摩耗量は、(1)熱間潤滑性の評価試験前後における「熱間潤滑性の測定装置の金型」の表面形状差分を分析することで測定した。具体的には、接触式の形状測定機を用いて,摺動前後の摺動部における金型表面のプロファイルを計測して、上金型及び下金型の各々の金型摩耗量を測定した。
また、実施例1~7において、上金型と接触するめっき鋼板の上面(第一面)をZnO皮膜で構成し、その下層のAlめっき層の付着量を「40~160g/m2」にすることで、上金型の摺動面の磨耗を低減できることを確認した。
本明細書に記載された全ての文献、特許出願、および技術規格は、個々の文献、特許出願、および技術規格が参照により取り込まれることが具体的かつ個々に記された場合と同程度に、本明細書中に参照により取り込まれる。
Claims (10)
- 鋼板と、
前記鋼板の第一面上に設けられた第一アルミめっき層と、
前記第一アルミめっき層の表面上に設けられた亜鉛化合物層または金属亜鉛層と、
前記鋼板の第二面上かつ最表面に設けられた第二アルミめっき層と、
を有するめっき鋼板。 - 前記第一アルミめっき層の付着量が、Al量換算で40~160g/m2である請求項1に記載のめっき鋼板。
- 前記第二アルミめっき層の付着量が、Al量換算で20~100g/m2である請求項1又は請求項2に記載のめっき鋼板。
- 前記第一アルミめっき層の付着量が、前記第二アルミめっき層の付着量よりも多い請求項1~請求項3のいずれか1項に記載のめっき鋼板。
- 請求項1~請求項4のいずれか1項のめっき鋼板が巻かれためっき鋼板コイルであって、
前記めっき鋼板の前記第一面が外側を向き、前記第二面が内側を向いているめっき鋼板コイル。 - 請求項1~請求項4のいずれか1項のめっき鋼板を加熱した後、上金型及び下金型を有する金型によりプレスして、熱間プレス成形する熱間プレス成形品の製造方法であって、
前記めっき鋼板の前記第一面を重力方向上側に向け、前記第二面を重力方向下側に向けた状態で、前記めっき鋼板のプレスを行う熱間プレス成形品の製造方法。 - 前記めっき鋼板の前記第一面を重力方向上側に向け、前記第二面を重力方向下側に向けた状態で、前記めっき鋼板の加熱を行う請求項6に記載の熱間プレス成形品の製造方法。
- 前記上金型がダイであり、下金型がパンチである請求項6又は請求項7に記載の熱間プレス成形品の製造方法。
- 前記金型が、前記めっき鋼板を押えるホルダーを有する請求項6~請求項8のいずれか1項に記載の熱間プレス成形品の製造方法。
- 焼入れ組織を有し、第一面側に凸に曲がった鋼板と、
前記鋼板の第一面上に設けられた第一アルミ-鉄合金層と、
前記第一アルミ-鉄合金層の面上に設けられた酸化亜鉛皮膜と、
前記酸化亜鉛皮膜の面上に設けられた塗装層と、
前記鋼板の第二面上に設けられた第二アルミ-鉄合金層と、
前記第二アルミ-鉄合金層の面上に設けられた酸化アルミ皮膜と、
を有する自動車部品。
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| CN201880062131.9A CN111148856A (zh) | 2017-09-28 | 2018-09-28 | 镀覆钢板、镀覆钢板卷材、热压成形品的制造方法及汽车部件 |
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| US12472715B2 (en) | 2021-03-16 | 2025-11-18 | Jfe Steel Corporation | Damage evaluation device and damage evaluation method for press-forming die |
| KR20250094784A (ko) * | 2023-12-18 | 2025-06-26 | 주식회사 포스코 | 알루미늄계 도금강재, 열간성형부재 및 그 제조방법 |
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| EP3677701A4 (en) | 2020-09-30 |
| BR112020006056A2 (pt) | 2020-10-06 |
| TWI677595B (zh) | 2019-11-21 |
| KR20200044980A (ko) | 2020-04-29 |
| CA3077016A1 (en) | 2019-04-04 |
| TW201915193A (zh) | 2019-04-16 |
| EP3677701A1 (en) | 2020-07-08 |
| JPWO2019066063A1 (ja) | 2020-08-06 |
| KR102172010B1 (ko) | 2020-11-02 |
| MX2020003891A (es) | 2020-08-20 |
| US20200238357A1 (en) | 2020-07-30 |
| CN111148856A (zh) | 2020-05-12 |
| JP6708310B2 (ja) | 2020-06-10 |
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