WO2023037396A1 - 溶融めっき鋼材 - Google Patents
溶融めっき鋼材 Download PDFInfo
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- WO2023037396A1 WO2023037396A1 PCT/JP2021/032749 JP2021032749W WO2023037396A1 WO 2023037396 A1 WO2023037396 A1 WO 2023037396A1 JP 2021032749 W JP2021032749 W JP 2021032749W WO 2023037396 A1 WO2023037396 A1 WO 2023037396A1
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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
- C23C2/06—Zinc or cadmium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
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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
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
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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
- 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
- B32B15/043—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 of metal
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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
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- 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
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
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- 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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- 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
- C23C2/50—Controlling or regulating the coating processes
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- C—CHEMISTRY; METALLURGY
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- 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
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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
- C23C28/3225—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only with at least one zinc-based layer
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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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
- C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12785—Group IIB metal-base component
- Y10T428/12792—Zn-base component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/12799—Next to Fe-base component [e.g., galvanized]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
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- Y10T428/12951—Fe-base component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
Definitions
- the present invention relates to hot-dip plated steel.
- hot-dip Zn-Al-Mg-based plated steel A steel material with a hot-dip Zn-plated layer containing Al and Mg formed on the surface (hot-dip Zn-Al-Mg-based plated steel) has excellent corrosion resistance. Therefore, hot-dip Zn--Al--Mg plated steel materials are widely used as materials for structural members that require corrosion resistance, such as building materials.
- Patent Document 1 discloses a plated steel material having a steel material and a plating layer including a Zn-Al-Mg alloy layer disposed on the surface of the steel material, wherein the plating layer has a predetermined chemical composition, Zn - After polishing the surface of the Al-Mg alloy layer to 1/2 of the layer thickness, in the backscattered electron image of the Zn-Al-Mg alloy layer obtained when observed with a scanning electron microscope at a magnification of 100 times, Al A plated steel material is disclosed in which Al crystals are present and the average value of the cumulative perimeter of the Al crystals is 88 to 195 mm/mm 2 .
- Patent document 2 has a steel sheet and a plating layer formed on at least a part of the surface of the steel sheet, and the chemical composition of the plating layer is more than 5.00% by mass of Al:35. 00% or less, Mg: 3.00 to 15.00%, Si: 0 to 2.00%, Ca: 0 to 2.00%, the balance being Zn and impurities, the plating layer is In the cross section in the thickness direction, the area ratio of the lamellar structure in which the (Al—Zn) phase and the MgZn 2 phase are arranged in layers is 10 to 90%, and the lamellar spacing of the lamellar structure is 2.5 ⁇ m or less, A plated steel sheet having an (Al—Zn) dendrite area ratio of 35% or less is disclosed.
- hot-dip Zn-Al-Mg plated steel materials are also required to have corrosion resistance in running water.
- Corrosion resistance to running water is corrosion resistance in a state of being exposed to running water.
- corrosion products adhering to the surface of the hot-dip plating layer are washed away, and the rust-preventing effect of the corrosion products is impaired. Therefore, the running water corrosion resistance of steel materials is evaluated by means different from the usual corrosion resistance.
- high corrosion resistance to running water is required for materials used as materials for wall surfaces of irrigation channels through which rainwater and industrial water always flow.
- Patent Document 1 the corrosion resistance of flat surfaces is evaluated according to JASO M609-91, and in this evaluation, the corrosive solution is assumed to be in a state of no flow. Therefore, Patent Literature 1 does not discuss or evaluate the corrosion resistance to flowing water.
- Patent Document 2 also evaluates the corrosion resistance after painting in a non-flowing water environment, and does not examine or evaluate the corrosion resistance under running water. Furthermore, as a result of the present inventors' investigation, it can be said that even hot-dip Zn-Al-Mg-based plated steel materials with high normal corrosion resistance, such as those disclosed in Patent Documents 1 and 2, do not have sufficient corrosion resistance in flowing water. I understand.
- the temperature range from the plating solidification start temperature to the plating solidification start temperature -30°C is to be cooled at an average cooling rate of 12°C/s or less.
- the present inventors have found that, in the hot-dip plating obtained under such cooling conditions, the interface between the ⁇ -phase and the MgZn 2- phase is likely to corrode under a running water environment, as will be described later.
- the plating stock sheet after the controlled cooling is stopped is to be cooled to 335 ° C. or less so that the average cooling rate is 5 ° C./sec or less, but the temperature range is 335 ° C. or less. , cooling control aimed at controlling the structure of the plating layer is not implemented.
- the ⁇ phase crystallizes from the ⁇ phase, and corrosion is likely to occur at the interface between the ⁇ phase and ⁇ phase and between the ⁇ phase and the MgZn 2- phase.
- the inventors have found that corrosion resistance is impaired.
- powdering is a phenomenon in which a hot-dip plated layer peels off and becomes powdery during press forming of a hot-dip Zn--Al--Mg-based plated steel. In order to use hot-dip Zn--Al--Mg plated steel as a material for various structural parts, powdering resistance is also required.
- an object of the present invention is to provide a hot-dip plated steel material that is excellent in powdering resistance and corrosion resistance in flowing water.
- the gist of the present invention is as follows.
- a hot-dip plated steel material includes a base steel material and a hot-dip plated layer disposed on the surface of the base steel material, and the chemical composition of the hot-dip plated layer is Al : 10.00-30.00%, Mg: 3.00-12.00%, Sn: 0-2.00%, Si: 0-2.50%, Ca: 0-3.00%, Ni: 0% or more and less than 0.25%, Cr: 0% or more and less than 0.25%, Ti: 0% or more and less than 0.25%, Co: 0% or more and less than 0.25%, V: 0% or more and less than 0.25 %, Nb: 0% or more and less than 0.25%, Cu: 0% or more and less than 0.25%, Mn: 0% or more and less than 0.25%, Bi: 0% or more and less than 5.000%, In: 0% % or more and less than 2.00%, Y: 0 to 0.50%, La: 0% or more and less than 0.50%, Ce
- the adjacent MgZn2 phase has a (111) ⁇ // (0001) MgZn2 orientation relationship. may be 60 to 100%.
- the adjacent MgZn2 phase in the chemical composition of the hot-dip plated layer, in mass%, Mg: 5.00 to 8.00%, Sn: 0.05 to It may be 2.00%.
- FIG. 1 is a cross-sectional view of a hot-dip plated steel material according to an aspect of the present invention
- FIG. 1 is a schematic diagram of an ⁇ -phase having a dendrite shape
- FIG. 1 is a schematic diagram of cooling conditions in manufacturing a hot-dip plated steel material according to an aspect of the present invention
- the inventors of the present invention have repeatedly studied means for improving the corrosion resistance of hot-dip plated steel.
- the present inventors focused on the crystal orientation relationship between the ⁇ -phase and the MgZn2- phase on the surface of the hot-dip plated layer.
- a hot-dip plated layer composed of a Zn--Al--Mg alloy contains an ⁇ phase and a MgZn 2 phase.
- the ⁇ -phase is a solid solution having a face-centered cubic lattice crystal structure whose chemical components are mainly composed of Al and Zn.
- the ⁇ phase may contain 0.5% or less of each of these elements. Since the ⁇ -phase is mainly composed of Al, it can be passivated and has the effect of improving the corrosion resistance of the plated layer on the flat surface. Furthermore, since the ⁇ -phase is highly plastically deformable due to its crystal structure, it also has the effect of improving the powdering resistance.
- the MgZn 2 phase is an intermetallic compound phase whose chemical composition is mainly composed of Mg and Zn.
- MgZn 2- phase has sacrificial corrosion resistance against base iron because it is electrically base in a corrosive environment, and the flat part corrosion resistance and sacrificial corrosion resistance of the hot-dip plated layer are improved by forming an insulating film of Zn-based corrosive organisms with Mg. improve sexuality.
- the inventors have found that corrosion tends to occur at the interface between these ⁇ phases and MgZn 2 phases.
- the natural potential of ⁇ -phase is higher than that of MgZn2 - phase. Therefore, galvanic corrosion occurs at the interface between the ⁇ phase and the MgZn2 phase.
- Corrosion at the interface between the ⁇ phase and the MgZn 2 phase was not regarded as a problem in the conventional evaluation of flat surface corrosion resistance in a non-flowing water environment.
- the reason for this is thought to be that in a non-flowing environment, corrosion products generated at the interface between the ⁇ phase and the MgZn2 phase adhere to the surface of the hot-dip plated layer and exert an anticorrosive effect.
- the corrosion products cannot provide an antirust effect. Therefore, corrosion occurring at the interface between the ⁇ phase and the MgZn2 phase is considered to impair the corrosion resistance in flowing water.
- the present inventors have found that the corrosion resistance of the interface between the ⁇ phase and the MgZn2 phase can be enhanced by setting the crystal orientation relationship between the ⁇ phase and the MgZn2 phase within a specific range.
- the present inventors have found that, in addition to the flat surface corrosion resistance that has been the focus of attention, the running water corrosion resistance of hot-dip plated steel can be improved by increasing the corrosion resistance at the interface between the ⁇ phase and the MgZn 2 phase.
- the "%" display of the content of each element in the chemical composition means “% by mass”.
- the content of an element in a chemical composition may be expressed as element concentration (for example, Zn concentration, Mg concentration, etc.).
- the term "flat area corrosion resistance” refers to the property of the hot-dip plated layer (specifically, the Zn--Al--Mg alloy layer) itself to be resistant to corrosion.
- “Sacrificial corrosion resistance” refers to the strength of the base steel at the exposed parts of the base steel (for example, the cut edges of the plated steel, cracks in the hot-dip coating layer during processing, and locations where the base steel is exposed due to peeling of the hot-dip coating layer). Shows the property of suppressing corrosion.
- the term “corrosion resistance in running water” indicates the property of the hot-dip coating layer itself to be resistant to corrosion in a running water environment to the extent that corrosion products on the surface of the plated steel material are washed away.
- a "hot-dip plated layer” means a plated film produced by so-called hot-dip galvanizing treatment.
- the hot-dip plated steel material 1 has a base steel material 11 .
- the shape of the base steel material is not particularly limited, and one example of the base steel material is a steel plate.
- Base steel materials include, for example, steel pipes, civil engineering and construction materials (fences, corrugated pipes, drain covers, sand prevention plates, bolts, wire meshes, guardrails, water stop walls, etc.), home appliance components (outdoor unit housings for air conditioners, etc.) etc.), automobile parts (suspension parts, etc.), and the like.
- Forming processing includes various plastic processing methods such as press processing, roll forming, and bending.
- Base steel materials include, for example, general steel, pre-plated steel, Al-killed steel, ultra-low-carbon steel, high-carbon steel, various high-strength steels, and some high-alloy steels (steel containing strengthening elements such as Ni and Cr), etc.
- the base steel material may be hot-rolled steel plate, hot-rolled steel strip, cold-rolled steel plate, cold-rolled steel strip, etc. described in JIS G 3302:2010.
- the method of manufacturing the base steel sheet hot rolling method, pickling method, cold rolling method, etc.
- specific manufacturing conditions thereof are not particularly limited.
- the base steel material may be pre-plated pre-plated steel material.
- Pre-plated steel materials are obtained, for example, by electrolytic treatment or displacement plating.
- Electrolytic treatment is carried out by immersing the base steel material in a sulfuric acid bath or a chloride bath containing metal ions of various pre-plating components for electrolytic treatment.
- Displacement plating is carried out by immersing a base steel material in an aqueous solution containing metal ions of various pre-plating components and pH-adjusted with sulfuric acid to cause displacement deposition of metals.
- An example of pre-plated steel is Ni pre-plated steel.
- the hot-dip plated steel material 1 according to this embodiment has a hot-dip plated layer 12 arranged on the surface of the base steel material.
- the hot-dip plated layer of the hot-dip plated steel material according to the present embodiment is mainly composed of a Zn--Al--Mg alloy layer due to the chemical composition described later. Further, the hot-dip plated layer of the hot-dip plated steel material according to the present embodiment may include an Al--Fe alloy layer between the base steel material and the Zn--Al--Mg alloy layer.
- the hot dip plated layer may have a single layer structure of a Zn--Al--Mg alloy layer, or may have a laminated structure including a Zn--Al--Mg alloy layer and an Al--Fe alloy layer.
- the chemical composition of the hot-dip plating layer according to this embodiment is composed of Zn and other alloying elements.
- the chemical composition of the hot-dip layer is described in detail below.
- the elements whose lower limit of concentration is 0% are not essential for solving the problems of the hot-dip plated steel material according to the present embodiment, but are included in the hot-dip plated layer for the purpose of improving properties. is an arbitrary element that is allowed to be
- Al forms an ⁇ -phase that is a solid solution with Zn, and contributes to the improvement of flat surface corrosion resistance, sacrificial corrosion resistance, running water corrosion resistance, and workability. Therefore, the Al concentration is set to 10.00% or more.
- the Al concentration may be 11.00% or more, 12.00% or more, or 15.00% or more.
- ⁇ crystallizes ahead of MgZn2 . Then, ⁇ grows without satisfying the crystal orientation relationship with the MgZn 2 phase. As a result, a structure that satisfies the ⁇ /MgZn 2 crystal orientation relationship is not formed in a sufficient amount, resulting in deterioration of corrosion resistance in flowing water. Therefore, the Al concentration is set to 30.00% or less.
- the Al concentration may be 28.00% or less, 25.00% or less, or 20.00% or less.
- Mg is an essential element for ensuring flat surface corrosion resistance, sacrificial corrosion resistance and flowing water corrosion resistance. Therefore, the Mg concentration should be 3.00% or more.
- the Mg concentration may be 4.00% or higher, 5.00% or higher, or 6.00% or higher.
- the Mg concentration is set to 12.00% or less.
- the Mg concentration may be 11.00% or less, 10.00% or less, 8.00% or less, less than 8.00%, or 6.00% or less.
- the Sn concentration may be 0%.
- Sn is an element that forms an intermetallic compound with Mg and improves the sacrificial corrosion resistance of the hot-dip plated layer. Therefore, the Sn concentration may be 0.05% or more, 0.10% or more, 0.20% or more, or 0.50% or more. However, if the Sn concentration is excessive, the planar corrosion resistance and the running water corrosion resistance deteriorate. Therefore, the Sn concentration is set to 2.00% or less.
- the Sn concentration may be 1.80% or less, 1.50% or less, or 1.20% or less.
- the Si concentration may be 0%.
- Si contributes to improvement of planar corrosion resistance and running water corrosion resistance. Therefore, the Si concentration may be 0.05% or more, 0.10% or more, 0.20% or more, or 0.50% or more.
- the Si concentration should be 2.50% or less.
- the Si concentration may be 2.40% or less, 1.80% or less, or 1.20% or less.
- the Ca concentration may be 0%.
- Ca is an element capable of adjusting the optimum Mg elution amount for imparting flat portion corrosion resistance and running water corrosion resistance. Therefore, the Ca concentration may be 0.05% or more, 0.1% or more, or 0.5% or more.
- the Ca concentration is set to 3.00% or less.
- the Ca concentration may be 2.40% or less, 1.80% or less, or 1.20% or less.
- Ni, Cr, Ti, Co, V, Nb, Cu and Mn 0% or more and less than 0.25% each>
- the concentration of Ni, Cr, Ti, Co, V, Nb, Cu and Mn may be 0%.
- these contribute to improvement of sacrificial corrosion resistance. Therefore, the respective concentrations of Ni, Cr, Ti, Co, V, Nb, Cu and Mn may be 0.05% or more, 0.08% or more, or 0.1% or more.
- concentrations of Ni, Cr, Ti, Co, V, Nb, Cu and Mn are excessive, the planar corrosion resistance and the running water corrosion resistance deteriorate.
- the respective concentrations of Ni, Cr, Ti, Co, V, Nb, Cu and Mn should be less than 0.25%.
- Each concentration of Ni, Cr, Ti, Co, V, Nb, Cu and Mn may be 0.22% or less, 0.20% or less, or 0.15% or less.
- the concentration of Bi may be 0%.
- Bi contributes to improvement of sacrificial corrosion resistance. Therefore, the Bi concentration may be 0.100% or more, 1.000% or more, or 3.000% or more.
- the Bi concentration should be less than 5.000%.
- the Bi concentration may be 4.800% or less, 4.500% or less, or 4.000% or less.
- the concentration of In may be 0%.
- In contributes to improvement of sacrificial corrosion resistance. Therefore, the In concentration may be 0.10% or more, 0.50% or more, or 1.00% or more.
- the In concentration should be less than 2.00%.
- the In concentration may be 1.80% or less, 1.50% or less, or 1.00% or less.
- the concentration of Y may be 0%.
- Y contributes to improvement of sacrificial corrosion resistance. Therefore, the Y concentration may be 0.10% or more, 0.15% or more, or 0.20% or more.
- the Y density is set to 0.50% or less.
- the Y concentration may be 0.30% or less, 0.25% or less, or 0.22% or less.
- each concentration of La and Ce may be 0%.
- La and Ce contribute to improvement of sacrificial corrosion resistance. Therefore, each of La concentration and Ce concentration may be 0.10% or more, 0.15% or more, or 0.20% or more.
- each of La concentration and Ce concentration is set to less than 0.50%.
- Each of La concentration and Ce concentration may be 0.40% or less, 0.30% or less, or 0.25% or less.
- the concentration of Fe may be 0%.
- Fe may be contained in the hot dip plated layer. It has been confirmed that if the Fe concentration is 5.00% or less, there is no adverse effect on the performance of the hot-dip plated layer.
- the Fe concentration may be, for example, 0.05% or more, 0.10% or more, 0.50% or more, or 1.00% or more.
- the Fe concentration may be, for example, 4.00% or less, 3.50% or less, or 3.00% or less. Since Fe may be mixed from the base material steel plate, the Fe concentration may be 0.05% or more.
- ⁇ Sr, Sb, Pb and B 0% or more and less than 0.50% each>
- the concentration of each of Sr, Sb, Pb and B may be 0%.
- Sr, Sb, Pb and B contribute to improvement of sacrificial corrosion resistance. Therefore, the respective concentrations of Sr, Sb, Pb and B may be 0.05% or more, 0.10% or more, or 0.15% or more.
- the concentration of each of Sr, Sb, Pb and B should be less than 0.50%.
- Each concentration of Sr, Sb, Pb and B may be 0.40% or less, 0.30% or less, or 0.25% or less.
- Zn and impurities The rest of the components of the hot-dip plated layer according to this embodiment are Zn and impurities.
- Zn is an element that brings flat part corrosion resistance and sacrificial corrosion resistance to the hot-dip coating layer.
- Impurities refer to components contained in raw materials or components mixed in during the manufacturing process and not intentionally included.
- the hot-dip plated layer may contain a small amount of components other than Fe as impurities due to mutual atomic diffusion between the base steel material and the plating bath.
- the chemical composition of the hot-dip plating layer is measured by the following method. First, using an acid containing an inhibitor for suppressing corrosion of the base steel material, an acid solution is obtained by stripping and dissolving the hot-dip plating layer. Next, the obtained acid solution is subjected to ICP analysis. Thereby, the chemical composition of the hot dipping layer can be obtained.
- the acid species is not particularly limited as long as it is an acid capable of dissolving the hot-dip plating layer.
- the chemical composition measured by the above means is the average chemical composition of the entire hot-dip plated layer.
- the metallographic structure of the hot-dip plated layer 12 contains 5 to 45 area % of ⁇ phase with a grain size of 0.5 to 2 ⁇ m. This area ratio is the area ratio of the ⁇ phase having a grain size of 0.5 to 2 ⁇ m with respect to all the phases constituting the hot-dip plating layer 12 .
- the ⁇ -phase having a particle size of 0.5 to 2 ⁇ m improves the corrosion resistance and powdering resistance of the hot-dip plated layer.
- these effects cannot be obtained when the amount of the ⁇ phase having a particle size of 0.5 to 2 ⁇ m is less than 5 area %. Therefore, the amount of the ⁇ phase with a particle size of 0.5 to 2 ⁇ m is made 5 area % or more.
- the amount of ⁇ -phase having a grain size of 0.5 to 2 ⁇ m may be 6 area % or more, 8 area % or more, or 10 area % or more.
- the amount of the ⁇ phase with a grain size of 0.5 to 2 ⁇ m exceeds 45 area %, the amount of the ⁇ phase becomes excessive with respect to the MgZn 2 phase. Therefore, the ⁇ -phase grows without being adjacent to the MgZn2- phase, and as a result, it becomes difficult to form a crystal orientation relationship at the interface between the ⁇ -phase and the MgZn2- phase, and the corrosion resistance of running water is lowered. Therefore, the amount of the ⁇ phase with a particle size of 0.5 to 2 ⁇ m is set to 45 area % or less.
- the amount of ⁇ -phase having a particle size of 0.5 to 2 ⁇ m may be 42 area % or less, 40 area % or less, or 35 area % or less.
- the area ratios of the ⁇ phase with a particle size of less than 0.5 ⁇ m and the ⁇ phase with a particle size of more than 2 ⁇ m are not particularly limited as long as the area ratio of the ⁇ phase with a particle size of 0.5 to 2 ⁇ m is within the above range.
- the area fraction of the ⁇ phase with a grain size of less than 0.5 ⁇ m and the ⁇ phase with a grain size of more than 2 ⁇ m is ignored.
- MgZn 2- phase improves the planar corrosion resistance, running water corrosion resistance, and powdering resistance of the hot-dip plating layer 12 .
- the amount of MgZn 2 phase is set to 15 area % or more.
- the amount of MgZn 2 phase may be 18 area % or more, 20 area % or more, or 25 area % or more.
- the amount of the MgZn 2 phase exceeds 70 area %, the powdering resistance of the hot-dip plated steel is impaired. This is because the MgZn2 phase is brittle. Therefore, the amount of MgZn 2 phase is set to 70 area % or less.
- the amount of MgZn 2 phase may be 65 area % or less, 60 area % or less, or 50 area % or less.
- the hot dip plated layer 12 may contain phases other than the ⁇ phase and the MgZn 2 phase.
- the hot-dip layer having the above chemical composition may include Mg 2 Sn phase, ⁇ / ⁇ /MgZn 2 ternary eutectic structure, ⁇ -Zn phase, Al-Ca-Si phase, and the like.
- the composition of the phases other than the ⁇ phase and the MgZn2 phase is not particularly limited.
- the hot-dip plated layer of the hot-dip plated steel material according to the present embodiment (111) ⁇ //( 0001 ) MgZn2
- the area ratio of ⁇ -phases having an orientation relationship is set to 25 to 100%.
- the hot-dip plated layer of the hot-dip plated steel according to the present embodiment satisfies the following formula.
- A1 Area of ⁇ phase with a grain size of 0.5 to 2 ⁇ m, measured in the cross section of the hot-dip plated layer
- A2 MgZn with a grain size of 0.5 to 2 ⁇ m, and adjacent MgZn, measured in the cross section of the hot-dip plated layer
- phase means an ⁇ -phase that is adjacent to the MgZn2 - phase and in which the (111) plane of the ⁇ -phase is parallel to the (0001) plane of the adjacent MgZn2 - phase.
- A2/A1 is set to 0.25 or more.
- A2/A1 may be 0.35 or more, 0.50 or more, or 0.60 or more. Since A2/A1 is preferably as high as possible, A2/A1 may be 1.00. On the other hand, A2/A1 may be 0.95 or less, 0.90 or less, or 0.85 or less.
- the method for measuring the area ratio of the ⁇ phase with a particle size of 0.5 to 2 ⁇ m is as follows.
- the surface of the plated layer of the sample cut to 30 mm x 30 mm is adjusted to be flat by mechanical polishing.
- the surface of the plating layer is chemically polished by colloidal polishing until the surface becomes a mirror surface.
- the surface of the plated layer after polishing is observed by SEM.
- an elemental distribution image is taken using SEM-EDS at a magnification of 5000 times. In this elemental distribution image, the phase in which Al and Zn coexist is specified as the ⁇ phase.
- the ⁇ -phase After specifying the ⁇ -phase, one having a grain size of 0.5 to 2 ⁇ m is selected from among the ⁇ -phases contained in the field of view. After that, the area ratio of the ⁇ phase having a particle size of 0.5 to 2 ⁇ m is calculated by binarization using image analysis software. Regarding the ⁇ -phase having a granular shape, the particle size of the ⁇ -phase is equivalent circle diameter. In addition, regarding the ⁇ -phase in which dendrites have grown, the grain size of the ⁇ -phase means the minor diameter of the dendrite. The short diameter of the dendrite is the maximum value of the dendrite width measured in the direction orthogonal to the long diameter direction of the dendrite, as shown in FIG.
- the method for measuring the area ratio of the MgZn 2 phase is as follows.
- the surface of the plated layer of the sample cut to 30 mm x 30 mm is adjusted to be flat by mechanical polishing.
- the surface of the plating layer is chemically polished by colloidal polishing until the surface becomes a mirror surface.
- the surface of the plated layer after polishing is observed by SEM.
- an elemental distribution image is taken using SEM-EDS at a magnification of 5000 times.
- the phase in which Mg and Zn coexist is specified as the MgZn 2 phase.
- the area ratio of the MgZn 2 phase contained in the field of view is calculated by binarization using image analysis software.
- a method for measuring the area ratio of the ⁇ phase having a (111) ⁇ //(0001) MgZn2 orientation relationship with the adjacent MgZn2 phase among the ⁇ phases having a grain size of 0.5 to 2 ⁇ m is as follows. First, the surface of the plating layer is mirror-polished and, if necessary, chemically polished. Next, the polished surface is observed with an SEM at a magnification of 5000 times. Then, five visual fields are selected in which 5% or more of the ⁇ phase having a particle size of 0.5 to 2 ⁇ m can be visually recognized in terms of area ratio. Crystallographic orientation analysis using EBSD is performed on these fields of view.
- the (111) pole figure of the ⁇ phase and the (0001) pole figure of the MgZn2 phase are obtained.
- a crystal orientation is selected in which the orientations of the ⁇ phase and the MgZn2 phase match.
- the crystal orientation that matches the crystal orientation pole figure can be identified.
- the ⁇ phase having a crystal orientation within ⁇ 10° in the measurement system is illustrated on the IPF map.
- ⁇ It is possible to calculate the area ratio of the ⁇ phase having a grain size of 0.5 to 2 ⁇ m and having a crystal orientation within 10°.
- the hot-dip plated layer As long as the area ratio of the ⁇ -phase, the area ratio of the MgZn2 - phase, and the state of the interface between the ⁇ -phase and the MgZn2 - phase are within the ranges described above, other constitutions of the hot-dip plated layer are not particularly limited.
- the structure of a normal hot-dip plated steel material can be suitably adopted for the hot-dip plated layer of the hot-dip plated steel material according to the present embodiment.
- a preferred configuration of the hot-dip plating layer is exemplified below.
- the coating weight per side of the hot-dip plating layer may be, for example, within the range of 20 to 150 g/m 2 .
- the adhesion amount per side may be, for example, within the range of 20 to 150 g/m 2 .
- the corrosion resistance of the hot-dip plated steel material can be further enhanced.
- the workability of the hot-dip plated steel material can be further improved by setting the adhesion amount per side to 150 g/m 2 or less.
- the manufacturing method of the hot-dip plated steel material according to this embodiment is not particularly limited.
- the hot-dip plated steel material according to the present embodiment can be obtained.
- the manufacturing method of the hot-dip plated steel material includes: a step of immersing the base steel material in a hot-dip plating bath and then withdrawing the base steel material to adhere a hot-dip plating layer to the surface of the base steel material; a step of cooling the hot-dip plated layer; with As illustrated in FIG. 3, the hot-dip plating layer immediately after being pulled up from the hot-dip plating bath is cooled to a quenching stop temperature of 360° C. or higher and 520° C. or lower at an average cooling rate of 15° C./second or more.
- a first cooling that quenches at a rate
- a second cooling that slowly cools the hot-dip plated layer from the rapid cooling stop temperature to 335°C at a cooling rate of 5°C/sec or less
- a third cooling that rapidly cools the hot-dip plated layer from 335° C. to 70° C. at a cooling rate of 70° C./sec or more; including.
- the base steel material is immersed in a hot-dip plating bath.
- the chemical composition of the hot-dip plating bath may be appropriately adjusted so as to obtain the chemical composition of the hot-dip plating layer described above.
- the temperature of the hot dip plating bath is not particularly limited, and a temperature at which hot dip plating can be performed can be appropriately selected.
- the plating bath temperature may be about 20° C. or more higher than the melting point of the plating bath.
- the base steel material is pulled up from the hot-dip plating bath.
- the adhesion amount of the hot-dip plating layer can be controlled.
- the base steel material to which the hot-dip plated layer has adhered may be wiped to control the amount of the hot-dip plated layer.
- the adhesion amount of the hot-dip plating layer is not particularly limited, and can be within the range described above, for example.
- Cooling consists of first cooling, second cooling, and third cooling.
- the molten metal (hot dipping layer) adhering to the surface of the base steel material is rapidly cooled. Specifically, the molten metal is acceleratedly cooled down to a rapid cooling stop temperature (controlled cooling stop temperature) within a temperature range of 360° C. or higher and 520° C. or lower by accelerated cooling means such as spraying a coolant.
- the rapid cooling stop temperature is the temperature of the hot-dip plated layer when accelerated cooling is stopped.
- the average cooling rate in the first cooling shall be 15° C./second or more.
- the average cooling rate in the first cooling is a value obtained by dividing the difference between the plating bath temperature and the quenching stop temperature by the elapsed time from the time the base steel material is pulled out of the plating bath to the time the accelerated cooling is stopped. is.
- the molten plating layer is slowly cooled.
- the average cooling rate in the temperature range from the above-described rapid cooling stop temperature to 335° C. is set to 5° C./second or less.
- the average cooling rate in the temperature range from the quenching stop temperature to 335°C is obtained by dividing the difference between the quenching stop temperature and 335°C by the time required for the temperature of the hot-dip coating layer to drop from the quenching stop temperature to 335°C. value.
- the cooling rate described above can be achieved by leaving the hot-dip plated layer on standby after stopping the accelerated cooling.
- heat treatment may be required to reduce the temperature drop rate of the hot-dip plating layer.
- the average cooling rate in the temperature range from 335°C to 70°C is set to 70°C/second or more.
- the average cooling rate in the temperature range from 335 ° C to 70 ° C is the difference between 335 ° C and 70 ° C (265 ° C), the time required for the temperature of the hot dipping layer to drop from 335 ° C to 70 ° C is the divided value.
- the above cooling rate can be achieved by water-cooling the hot-dip plated steel material.
- the hot-dip plated layer By cooling the hot-dip plated layer so as to satisfy the above conditions, it is possible to form a hot-dip plated layer in which the amount of the ⁇ phase having the (111) ⁇ // (0001) MgZn2 orientation relationship is 25 area % or more. .
- the inventors presume that the reason is as follows. In the first cooling, the molten metal is quenched. This causes both the ⁇ phase and the MgZn2 phase to crystallize out of the molten metal. In the second cooling following this, the hot-dip plated layer in which both the ⁇ -phase and the MgZn 2- phase are crystallized is slowly cooled. Thereby, the crystal can be grown while the ⁇ -phase and the MgZn2 - phase are in contact with each other.
- the crystal orientations at the interface between the ⁇ phase and the MgZn2 phase match, and solidification of the molten metal can be completed in a state where the (111) ⁇ //(0001) MgZn2 orientation relationship is established.
- the hot-dip plated layer containing a large amount of the ⁇ phase with the (111) ⁇ //(0001) MgZn2 orientation relationship is rapidly cooled again.
- the solid-phase transformation in which the ⁇ phase precipitates from the ⁇ phase can be suppressed, and the (111) ⁇ //(0001) MgZn2 orientation relationship can be preserved.
- Various hot-dip plated steel products are produced by immersing the base steel material in various hot-dip plating baths and pulling it out to adhere a hot-dip plated layer to the surface of the base steel material, and then cooling the hot-dip plated layer under various conditions. manufactured.
- the chemical composition of the hot dipping layer was as shown in Tables 1A and 1B.
- the symbol "-" is shown in Tables 1A and 1B.
- the manufacturing conditions were as shown in Tables 2A and 2B.
- the metallographic structure of the plating layer was evaluated, and the results are shown in Tables 3A and 3B.
- the powdering resistance and corrosion resistance of the hot-dip plated steel were evaluated, and the results are shown in Tables 4A and 4B.
- the evaluation of the chemical composition of the hot-dip plated layer and the metal structure of the hot-dip plated layer was performed by the means described above. Some of the base steel materials were pre-plated with Ni before being hot-dip galvanized. The components of the Ni pre-plating are included in the hot-dip layer chemical composition disclosed in Tables 1 and 1B.
- Hot-dip plated steel materials with an evaluation result of A or AA were judged to be steel materials with excellent powdering resistance.
- test piece having dimensions of 200 mm ⁇ 100 mm ⁇ 0.8 mm was prepared by cutting the hot-dip plated steel material.
- a tape was attached to the surface opposite to the evaluation surface and to a range of 5 mm width from the cut end surface of the evaluation surface to avoid contact with the corrosive solution.
- the test piece was placed on a table with an inclination angle of 60° with respect to the horizontal plane.
- the step of exposing the test piece to running water and the step of drying the test piece were alternately repeated.
- a 0.5% NaCl solution was run at a flow rate of 100 ml/min for 6 hours.
- drying step the specimen was allowed to stand for 18 hours.
- test environment was the atmosphere, and the temperature was kept at 25°C. After 336 hours, the corrosion weight loss per unit area of the plating layer was measured. Those with corrosion weight loss of 30 g/m 2 or less were rated "AA", those with 60 g/m 2 or less were rated "A”, and those with more than 60 g/m 2 were rated "B”.
- a hot-dip plated steel material with an evaluation result of A or AA was judged to be a steel material with excellent corrosion resistance in flowing water. According to the evaluation method described above, it can be judged that the hot-dip plated steel material having high corrosion resistance in flowing water also has high corrosion resistance in the plane portion.
- Comparative Example b1 the amount of Al in the hot-dip plated layer was insufficient. Therefore, the ⁇ -phase was insufficient in Comparative Example b1. In addition, since crystal growth occurred in a state where the ⁇ phase and the MgZn2 phase did not contact each other, in Comparative Example b1, the ratio of the ⁇ phase having an appropriate crystal orientation relationship with the MgZn2 phase was also insufficient. As a result, in Comparative Example b1, both powdering resistance and running water corrosion resistance were insufficient. In Comparative Example b2, the amount of Mg in the hot-dip plated layer was insufficient. Therefore, the MgZn 2 phase was insufficient in Comparative Example b2. As a result, in Comparative Example b2, the running water corrosion resistance was insufficient.
- Comparative Example b3 the amount of Mg in the hot-dip plated layer was excessive. Therefore, in Comparative Example b3, the brittle MgZn 2 phase was excessive, and both powdering resistance and running water corrosion resistance were insufficient. In Comparative Example b4, the amount of Si in the hot-dip plated layer was excessive. Therefore, a large amount of a brittle Si-based compound was formed in the hot-dip plated layer of Comparative Example b3, and both the powdering resistance and the running water corrosion resistance were insufficient. In Comparative Example b5, the amount of Al in the hot-dip plated layer was excessive.
- Comparative Example b5 the amount of the ⁇ -phase that crystal-grown without contacting the MgZn2- phase increased, and the ratio of the ⁇ -phase having an appropriate crystal orientation relationship with the MgZn2 - phase decreased.
- the running water corrosion resistance was insufficient.
- Comparative Example b6 the amount of Ca in the hot-dip plated layer was excessive. Therefore, a large amount of brittle Ca-based compounds were formed in the hot-dip plated layer of Comparative Example b6, and both powdering resistance and running water corrosion resistance were insufficient.
- Comparative Examples b7 and b11 the average cooling rate in the first cooling was insufficient.
- Comparative Examples b7 and b11 crystal growth occurred in a state where the ⁇ phase and the MgZn2 phase were not in contact with each other, and the proportion of the ⁇ phase having an appropriate crystal orientation relationship with the MgZn2 phase was insufficient.
- the running water corrosion resistance was insufficient.
- the powdering resistance was also insufficient in Comparative Example b7.
- Comparative Example b8 and Comparative Example b12 the average cooling rate in the second cooling was excessive.
- Comparative Examples b8 and Comparative Examples b12 the ⁇ phase and the MgZn2 phase in contact with each other could not be sufficiently grown, and the ratio of the ⁇ phase having an appropriate crystal orientation relationship with the MgZn2 phase ran out.
- the running water corrosion resistance was insufficient.
- Comparative Example b9 the average cooling rate in the third cooling was insufficient. Therefore, in Comparative Example b9, the ⁇ phase was separated into an Al-rich ⁇ phase and a Zn-rich ⁇ phase during the third cooling, and the ratio of the ⁇ phase having an appropriate crystal orientation relationship with the MgZn 2 phase was lacked.
- Comparative Example b9 the running water corrosion resistance was insufficient.
- Comparative Example b10 the amount of Sn in the hot-dip plated layer was excessive. Therefore, in Comparative Example b10, Sn-based compounds with low corrosion resistance were generated, and the running water corrosion resistance was insufficient.
- the examples according to the present invention in which the chemical composition and metallographic structure of the hot-dip plating layer were appropriately controlled, were excellent in powdering resistance and running water corrosion resistance.
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Abstract
Description
さらに本発明者らが検討したところ、特許文献1及び2に開示されたような、通常の耐食性が高い溶融Zn-Al-Mg系めっき鋼材であっても、その流水耐食性は十分とは言えないことがわかった。例えば特許文献1においては、めっき凝固開始温度からめっき凝固開始温度-30℃までの温度域を、平均冷却速度12℃/s以下で冷却することとされている。このような冷却条件によって得られた溶融めっきにおいては、後述するように、α相とMgZn2相との間の界面が流水環境下で腐食しやすいことを、本発明者らは知見した。また、特許文献2においては、制御冷却停止後のめっき原板を、平均冷却速度が5℃/秒以下となるように、335℃以下まで冷却することとされているが、335℃以下の温度域において、めっき層の組織制御を目的とした冷却制御は実施されていない。このような冷却条件によって得られた溶融めっきにおいては、α相からη相が晶出し、α相とη相の界面や、α相とMgZn2相との間の界面で腐食が生じやすく、流水耐食性が損なわれることを本発明者らは知見した。
(2)上記(1)に記載の溶融めっき鋼材では、粒径0.5~2μmの前記α相のうち、隣接する前記MgZn2相に対して(111)α//(0001)MgZn2方位関係を有する前記α相の前記面積率が、60~100%であってもよい。
(3)上記(1)又は(2)に記載の溶融めっき鋼材では、前記溶融めっき層の前記化学組成において、質量%で、Mg:5.00~8.00%、Sn:0.05~2.00%であってもよい。
Alは、Znとの固溶体であるα相を形成し、平面部耐食性、犠牲防食性及び流水耐食性、並びに加工性の向上に寄与する。従って、Al濃度は10.00%以上とする。Al濃度を11.00%以上、12.00%以上、又は15.00%以上としてもよい。
一方、Alが過剰である場合、αがMgZn2に先んじて晶出する。そして、αは、MgZn2相と結晶方位関係を満たさないまま成長する。その結果として、α/MgZn2結晶方位関係を満たす組織が十分な量で形成しないため、流水耐食性が劣化する。よって、Al濃度は30.00%以下とする。Al濃度を28.00%以下、25.00%以下、又は20.00%以下としてもよい。
Mgは、平面部耐食性、犠牲防食性及び流水耐食性を確保するために必須の元素である。従って、Mg濃度は、3.00%以上とする。Mg濃度を4.00%以上、5.00%以上、又は6.00%以上としてもよい。
一方、Mg濃度が過剰であると、加工性、特にパウダリング性が劣化する。よって、Mg濃度は12.00%以下とする。Mg濃度を11.00%以下、10.00%以下、8.00%以下、8.00%未満、又は6.00%以下としてもよい。
Sn濃度は0%であってもよい。一方、Snは、Mgと金属間化合物を形成し、溶融めっき層の犠牲防食性を向上させる元素である。従って、Sn濃度を0.05%以上、0.10%以上、0.20%以上、又は0.50%以上としてもよい。
ただし、Sn濃度が過剰であると、平面耐食性及び流水耐食性が劣化する。従って、Sn濃度は2.00%以下とする。Sn濃度を1.80%以下、1.50%以下、又は1.20%以下としてもよい。
Si濃度は0%であってもよい。一方、Siは、平面耐食性及び流水耐食性の向上に寄与する。従って、Si濃度を0.05%以上、0.10%以上、0.20%以上、又は0.50%以上としてもよい。
一方、Si濃度が過剰であると、平面部耐食性、犠牲防食性および加工性が劣化する。従って、Si濃度は2.50%以下とする。Si濃度を2.40%以下、1.80%以下、又は1.20%以下としてもよい。
Ca濃度は0%であってもよい。一方、Caは、平面部耐食性、及び流水耐食性を付与するのに最適なMg溶出量を調整することができる元素である。従って、Ca濃度は0.05%以上、0.1%以上、又は0.5%以上であってもよい。
一方、Ca濃度が過剰であると、平面部耐食性、流水耐食性、及び加工性が劣化する。従って、Ca濃度は3.00%以下とする。Ca濃度を2.40%以下、1.80%以下、又は1.20%以下としてもよい。
Ni、Cr、Ti、Co、V、Nb、CuおよびMnの濃度は0%でもよい。一方、これらは犠牲防食性の向上に寄与する。従って、Ni、Cr、Ti、Co、V、Nb、CuおよびMnそれぞれの濃度を0.05%以上、0.08%以上、又は0.1%以上としてもよい。
一方、Ni、Cr、Ti、Co、V、Nb、CuおよびMnの濃度が過剰であると、平面耐食性及び流水耐食性が劣化する。従って、Ni、Cr、Ti、Co、V、Nb、CuおよびMnそれぞれの濃度は、0.25%未満とする。Ni、Cr、Ti、Co、V、Nb、CuおよびMnそれぞれの濃度を0.22%以下、0.20%以下、又は0.15%以下としてもよい。
Biの濃度は0%でもよい。一方、Biは犠牲防食性の向上に寄与する。従って、Bi濃度を0.100%以上、1.000%以上、又は3.000%以上としてもよい。
一方、Bi濃度が過剰であると、平面耐食性及び流水耐食性が劣化する。従って、Bi濃度は5.000%未満とする。Bi濃度を4.800%以下、4.500%以下、又は4.000%以下としてもよい。
Inの濃度は0%でもよい。一方、Inは、犠牲防食性の向上に寄与する。従って、In濃度は0.10%以上、0.50%以上、又は1.00%以上であってもよい。
一方、In濃度が過剰であると、平面耐食性及び流水耐食性が劣化する。従って、In濃度は2.00%未満とする。In濃度を1.80%以下、1.50%以下、又は1.00%以下としてもよい。
Yの濃度は0%でもよい。一方、Yは、犠牲防食性の向上に寄与する。従って、Y濃度は0.10%以上、0.15%以上、又は0.20%以上としてもよい。
一方、Y濃度が過剰であると、平面耐食性及び流水耐食性が劣化する。従って、Y濃度は0.50%以下とする。Y濃度は0.30%以下、0.25%以下、又は0.22%以下であってもよい。
LaおよびCeそれぞれの濃度は0%でもよい。一方、LaおよびCeは、犠牲防食性の向上に寄与する。従って、La濃度およびCe濃度それぞれを0.10%以上、0.15%以上、又は0.20%以上としてもよい。
一方、La濃度およびCe濃度が過剰であると、平面耐食性及び流水耐食性が劣化する。従って、La濃度およびCe濃度それぞれを、0.50%未満とする。La濃度およびCe濃度それぞれを0.40%以下、0.30%以下、又は0.25%以下としてもよい。
Feの濃度は0%でもよい。一方、Feが溶融めっき層に含有されてもよい。Fe濃度が5.00%以下であれば、溶融めっき層の性能に悪影響がないことが確認されている。Fe濃度を例えば0.05%以上、0.10%以上、0.50%以上、又は1.00%以上としてもよい。Fe濃度を例えば4.00%以下、3.50%以下、又は3.00%以下としてもよい。Feは、母材鋼板から混入する場合があるため、Fe濃度は0.05%以上でもよい。
Sr、Sb、PbおよびBそれぞれの濃度は0%でもよい。一方、Sr、Sb、PbおよびBは、犠牲防食性の向上に寄与する。従って、Sr、Sb、PbおよびBそれぞれの濃度を0.05%以上、0.10%以上、又は0.15%以上としてもよい。
一方、Sr、Sb、PbおよびBの濃度が過剰であると、平面耐食性及び流水耐食性が劣化する。従って、Sr、Sb、PbおよびBそれぞれの濃度は0.50%未満とする。Sr、Sb、PbおよびBそれぞれの濃度を0.40%以下、0.30%以下、又は0.25%以下としてもよい。
本実施形態に係る溶融めっき層の成分の残部は、Zn及び不純物である。Znは、平面部耐食性及び犠牲防食性を溶融めっき層にもたらす元素である。不純物は、原材料に含まれる成分、または、製造の工程で混入する成分であって、意図的に含有させたものではない成分を指す。例えば、溶融めっき層には、素地鋼材とめっき浴との相互の原子拡散によって、不純物として、Fe以外の成分も微量混入することがある。
溶融めっき層12の金属組織は、粒径0.5~2μmのα相を、5~45面積%含有する。この面積率は、溶融めっき層12を構成する全ての相に対する、粒径0.5~2μmのα相の面積率である。
一方、粒径0.5~2μmのα相の量が45面積%超である場合、α相の量がMgZn2相に対し過剰となる。そのため、α相がMgZn2相と隣接しない状態のまま成長し、結果として、α相とMgZn2相との界面で結晶方位関係を形成することが困難となり、流水耐食性が低下する。従って、粒径0.5~2μmのα相の量は45面積%以下とする。粒径0.5~2μmのα相の量を42面積%以下、40面積%以下、又は35面積%以下としてもよい。
MgZn2相は、溶融めっき層12の平面耐食性、流水耐食性及び耐パウダリング性を向上させる。しかし、MgZn2相の量が15面積%未満である場合、これら効果が得られない。従って、MgZn2相の量を15面積%以上とする。MgZn2相の量を18面積%以上、20面積%以上、又は25面積%以上としてもよい。
一方、MgZn2相の量が70面積%超である場合、溶融めっき鋼材の耐パウダリング性が損なわれる。MgZn2相は脆いからである。従って、MgZn2相の量は70面積%以下とする。MgZn2相の量を65面積%以下、60面積%以下、又は50面積%以下としてもよい。
α相の自然電位は、MgZn2相の自然電位よりも高い。従って、α相とMgZn2相との界面では、異種金属接触腐食が生じる。これは、粒径0.5~2μmのα相の量が5面積%以上である場合に、特に顕著となる。なぜなら、粒径2μm以下の微細なα相の量が増えると、流水環境に露出するα相の界面の長さが増大するからである。溶融めっき鋼材の流水耐食性を向上させるためには、α相とMgZn2相との界面の耐食性を増大させる必要がある。
0.25≦A2/A1≦1.00
A1:溶融めっき層の断面で測定される、粒径0.5~2μmのα相の面積
A2:溶融めっき層の断面で測定される、粒径0.5~2μmであって且つ隣接するMgZn2相に対して(111)α//(0001)MgZn2方位関係を有するα相の面積
ここで、「隣接するMgZn2相に対して(111)α//(0001)MgZn2方位関係を有するα相」とは、MgZn2相と隣接しており、且つ、α相の(111)面と、隣接するMgZn2相の(0001)面とが平行であるα相のことである。
まず、めっき層の表面を鏡面研磨し、必要に応じて化学研磨する。次に、倍率5000倍で、研磨された面をSEMで観察する。そして、粒径が0.5~2μmのα相が面積率で5%以上視認できる視野を、5箇所選定する。これらの視野に対して、EBSDを用いた結晶方位分析を実施する。そして、α相の(111)極点図、及びMgZn2相の(0001)極点図を得る。これら極点図を対比し、α相及びMgZn2相の方位が一致する結晶方位を選択する。
以上の手順により、結晶方位極点図が一致する結晶方位を特定することができる。この結晶方位から、測定系において±10°以内の結晶方位を有するα相を、IPFマップに図示する。このIPFマップの画像を二値化して、画像分析に供することにより、観察視野中の粒径0.5~2μmのα相に占める、α相及びMgZn2相の方位が一致する結晶方位から±10°以内の結晶方位を有する、粒径0.5~2μmのα相の面積率を算出することができる。
素地鋼材を溶融めっき浴に浸漬し、次いで引き上げることにより、溶融めっき層を前記素地鋼材の表面に付着させる工程と、
前記溶融めっき層を冷却する工程と、
を備え、
前記冷却は、図3に例示されるように
前記溶融めっき浴から引き上げられた直後の前記溶融めっき層を、360℃以上520℃以下の急冷停止温度まで、平均冷却速度15℃/秒以上の冷却速度で急冷する第1の冷却と、
前記溶融めっき層を、前記急冷停止温度から335℃まで、5℃/秒以下の冷却速度で徐冷する第2の冷却と、
前記溶融めっき層を、335℃から70℃まで、70℃/秒以上の冷却速度で急冷する第3の冷却と、
を含む。
第1の冷却では、溶融金属が急冷される。これにより、溶融金属から、α相及びMgZn2相の両方が晶出する。
これに次ぐ第2の冷却では、α相及びMgZn2相の両方を晶出させた溶融めっき層を徐冷する。これにより、α相とMgZn2相とを接触させた状態で、結晶成長させることができる。その結果、α相とMgZn2相との界面における結晶方位が整合し、(111)α//(0001)MgZn2方位関係を成立させた状態で、溶融金属の凝固を完了させることができる。
第3の冷却では、(111)α//(0001)MgZn2方位関係が成立したα相が多く含まれる溶融めっき層を、再び急冷する。これにより、α相からη相が析出する固相変態を抑制し、(111)α//(0001)MgZn2方位関係を保存することができる。
比較例b2では、溶融めっき層のMg量が不足していた。そのため、比較例b2ではMgZn2相が不足していた。その結果、比較例b2では、流水耐食性が不足した。
比較例b3では、溶融めっき層のMg量が過剰であった。そのため、比較例b3では脆いMgZn2相が過剰となり、耐パウダリング性及び流水耐食性の両方が不足した。
比較例b4では、溶融めっき層のSi量が過剰であった。そのため、比較例b3の溶融めっき層には脆いSi系化合物が多量に生成し、耐パウダリング性及び流水耐食性の両方が不足した。
比較例b5では、溶融めっき層のAl量が過剰であった。そのため、比較例b5では、MgZn2相と接しない状態で結晶成長するα相の量が増大し、MgZn2相との間で適切な結晶方位関係を有するα相の割合が小さくなった。その結果、比較例b5では、流水耐食性が不足した。
比較例b6では、溶融めっき層のCa量が過剰であった。そのため、比較例b6の溶融めっき層には脆いCa系化合物が多量に生成し、耐パウダリング性及び流水耐食性の両方が不足した。
比較例b7及び比較例b11では、第1の冷却における平均冷却速度が不足していた。そのため比較例b7及び比較例b11では、α相とMgZn2相とが接しない状態で結晶成長が生じ、MgZn2相との間で適切な結晶方位関係を有するα相の割合が不足した。その結果、比較例b7及び比較例b11では、流水耐食性が不足した。また、比較例b7では耐パウダリング性も不足した。
比較例b8及び比較例b12では、第2の冷却における平均冷却速度が過剰であった。そのため比較例b8及び比較例b12では、互いに接した状態にあるα相及びMgZn2相を十分に成長させることができず、MgZn2相との間で適切な結晶方位関係を有するα相の割合が不足した。その結果、比較例b8及び比較例b12では、流水耐食性が不足した。
比較例b9では、第3の冷却における平均冷却速度が不足していた。そのため比較例b9では、第3の冷却の際にα相がAlリッチなα相及びZnリッチなη相に分離し、MgZn2相との間で適切な結晶方位関係を有するα相の割合が不足した。その結果、比較例b9では、流水耐食性が不足した。
比較例b10では、溶融めっき層のSn量が過剰であった。そのため、比較例b10では耐食性が低いSn系化合物が生成し、流水耐食性が不足した。
11 素地鋼材
12 溶融めっき層
Claims (3)
- 素地鋼材と、
前記素地鋼材の表面に配された溶融めっき層と、を備え、
前記溶融めっき層の化学組成が、質量%で、
Al:10.00~30.00%、
Mg:3.00~12.00%、
Sn:0~2.00%、
Si:0~2.50%、
Ca:0~3.00%、
Ni:0%以上0.25%未満、
Cr:0%以上0.25%未満、
Ti:0%以上0.25%未満、
Co:0%以上0.25%未満、
V :0%以上0.25%未満、
Nb:0%以上0.25%未満、
Cu:0%以上0.25%未満、
Mn:0%以上0.25%未満、
Bi:0%以上5.000%未満、
In:0%以上2.00%未満、
Y :0~0.50%、
La:0%以上0.50%未満、
Ce:0%以上0.50%未満、
Fe:0~5.00%、
Sr:0%以上0.50%未満、
Sb:0%以上0.50%未満、
Pb:0%以上0.50%未満、及び
B :0%以上0.50%未満
を含有し、残部がZn及び不純物からなり、
前記溶融めっき層の金属組織が、粒径0.5~2μmのα相を、5~45面積%含有し、
前記溶融めっき層の前記金属組織が、MgZn2相を、15~70面積%含有し、
粒径0.5~2μmの前記α相のうち、隣接する前記MgZn2相に対して(111)α//(0001)MgZn2方位関係を有するα相の面積率が、25~100%である
溶融めっき鋼材。 - 粒径0.5~2μmの前記α相のうち、隣接する前記MgZn2相に対して(111)α//(0001)MgZn2方位関係を有する前記α相の前記面積率が、60~100%である
ことを特徴とする請求項1に記載の溶融めっき鋼材。 - 前記溶融めっき層の前記化学組成において、質量%で、
Mg:5.00~8.00%、
Sn:0.05~2.00%である
ことを特徴とする請求項1又は2に記載の溶融めっき鋼材。
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| JP2022504124A JP7056811B1 (ja) | 2021-09-07 | 2021-09-07 | 溶融めっき鋼材 |
| PL21944420.5T PL4174203T3 (pl) | 2021-09-07 | 2021-09-07 | Materiał stalowy galwanizowany zanurzeniowo na gorąco |
| EP21944420.5A EP4174203B1 (en) | 2021-09-07 | 2021-09-07 | Hot-dip galvanized steel material |
| EP24194567.4A EP4484584A1 (en) | 2021-09-07 | 2021-09-07 | Hot-dip galvanized steel material |
| PCT/JP2021/032749 WO2023037396A1 (ja) | 2021-09-07 | 2021-09-07 | 溶融めっき鋼材 |
| KR1020227045399A KR102524791B1 (ko) | 2021-09-07 | 2021-09-07 | 용융 도금 강재 |
| MX2024002595A MX2024002595A (es) | 2021-09-07 | 2021-09-07 | Acero enchapado por inmersion en caliente. |
| CN202180046313.9A CN117280070B (zh) | 2021-09-07 | 2021-09-07 | 热浸镀钢材 |
| ES21944420T ES2991302T3 (es) | 2021-09-07 | 2021-09-07 | Acero chapado por inmersión en caliente |
| AU2021463503A AU2021463503B2 (en) | 2021-09-07 | 2021-09-07 | Hot-dip plated steel |
| CN202410403454.7A CN118241139A (zh) | 2021-09-07 | 2021-09-07 | 热浸镀钢材 |
| HUE21944420A HUE069505T2 (hu) | 2021-09-07 | 2021-09-07 | Forrón merített galvanizált acél anyag |
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| PE2024000334A PE20240737A1 (es) | 2021-09-07 | 2021-09-07 | Acero enchapado por inmersion en caliente |
| ECSENADI202416851A ECSP24016851A (es) | 2021-09-07 | 2024-03-01 | Acero enchapado por inmersión en caliente |
| CONC2024/0004134A CO2024004134A2 (es) | 2021-09-07 | 2024-04-03 | Acero chapado en caliente |
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| JP2023104640A (ja) * | 2022-01-18 | 2023-07-28 | 日本製鉄株式会社 | めっき鋼線 |
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| WO2024143367A1 (ja) * | 2022-12-26 | 2024-07-04 | 日本製鉄株式会社 | めっき鋼板 |
| JPWO2024219123A1 (ja) * | 2023-04-17 | 2024-10-24 | ||
| WO2025225565A1 (ja) * | 2024-04-23 | 2025-10-30 | 日本製鉄株式会社 | めっき鋼材 |
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- 2021-09-07 ES ES21944420T patent/ES2991302T3/es active Active
- 2021-09-07 EP EP21944420.5A patent/EP4174203B1/en active Active
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- 2021-09-07 WO PCT/JP2021/032749 patent/WO2023037396A1/ja not_active Ceased
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| PE20240737A1 (es) | 2024-04-16 |
| EP4174203C0 (en) | 2024-10-02 |
| CN117280070B (zh) | 2024-04-19 |
| JPWO2023037396A1 (ja) | 2023-03-16 |
| AU2021463503B2 (en) | 2025-06-05 |
| EP4174203B1 (en) | 2024-10-02 |
| EP4174203A4 (en) | 2023-09-06 |
| KR20230038660A (ko) | 2023-03-21 |
| AU2021463503A1 (en) | 2024-03-28 |
| EP4174203A1 (en) | 2023-05-03 |
| ES2991302T3 (es) | 2024-12-03 |
| PL4174203T3 (pl) | 2025-02-03 |
| CN117280070A (zh) | 2023-12-22 |
| CN118241139A (zh) | 2024-06-25 |
| EP4484584A1 (en) | 2025-01-01 |
| KR102524791B1 (ko) | 2023-04-24 |
| CA3229519A1 (en) | 2023-03-16 |
| HUE069505T2 (hu) | 2025-03-28 |
| US20230203635A1 (en) | 2023-06-29 |
| JP7056811B1 (ja) | 2022-04-19 |
| MX2024002595A (es) | 2024-03-22 |
| US11814732B2 (en) | 2023-11-14 |
| ECSP24016851A (es) | 2024-04-30 |
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