WO2022215228A1 - ホットスタンプ用鋼板及びホットスタンプ部材 - Google Patents
ホットスタンプ用鋼板及びホットスタンプ部材 Download PDFInfo
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- WO2022215228A1 WO2022215228A1 PCT/JP2021/014907 JP2021014907W WO2022215228A1 WO 2022215228 A1 WO2022215228 A1 WO 2022215228A1 JP 2021014907 W JP2021014907 W JP 2021014907W WO 2022215228 A1 WO2022215228 A1 WO 2022215228A1
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- WIPO (PCT)
- Prior art keywords
- oxide
- surface treatment
- treatment film
- hot stamping
- steel sheet
- Prior art date
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- C—CHEMISTRY; METALLURGY
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- 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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- 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
- C23C28/04—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 of inorganic non-metallic material
- C23C28/042—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 of inorganic non-metallic material including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/61—Additives non-macromolecular inorganic
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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
- C21D1/34—Methods of heating
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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
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
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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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
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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
- C21D2221/00—Treating localised areas of an article
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
- C21D8/0405—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/30—Ferrous alloys, e.g. steel alloys containing chromium with cobalt
Definitions
- the present invention relates to a hot stamping steel sheet and a hot stamping member.
- hot stamping method also called hot pressing method, hot pressing method, high temperature pressing method, die quenching method.
- the material to be formed is heated to a high temperature to transform it into a structure called austenite (austenitization), the steel plate softened by heating is pressed and formed, and after forming, it is cooled.
- austenite austenite
- the material is once heated to a high temperature and softened, so that the material can be easily pressed.
- the mechanical strength of the material can be enhanced by the quenching effect of cooling after molding. Therefore, by this hot stamping method, a molded article having good shape fixability and high mechanical strength can be obtained.
- Patent Document 1 describes a component in which at least two types of Zn-based plated steel sheets with different steel components are joined.
- Patent Document 2 describes a technique of differentiating the average cooling rate and the cooling stop temperature depending on the location of the steel sheet to create different structures after cooling.
- Patent Document 3 describes a technique for enhancing ductility by tempering a part of the steel after martensitic transformation by controlling the temperature of the mold.
- Patent Document 1 In order to manufacture the parts as described in Patent Document 1, it is required to manufacture steel sheets with different strengths, which increases the manufacturing load and increases the joining process. necessary and not economical.
- Patent Document 2 if the method described in Patent Document 2 is used, it is economically disadvantageous because two types of molds for cooling are required, and it becomes difficult to ensure robustness in manufacturing. , unfavorable.
- Patent Document 3 Even if the technique described in Patent Document 3 is used, it is difficult to ensure robustness of manufacturing as in Patent Document 2, which is not preferable.
- the current situation is that there is a desire for a technology that can perform hot stamping while suppressing cost increases and ensuring product robustness.
- an object of the present invention is to provide a steel sheet for hot stamping suitable for manufacturing parts having portions with different strengths by hot stamping, and a steel sheet for hot stamping. and a hot stamping member having different parts.
- the present inventors conducted extensive studies and found that a surface treatment film with a high emissivity is applied to a part of the surface of the steel plate. The idea was to increase the rate of temperature rise (rate of temperature rise).
- the present invention is based on the above knowledge obtained by the present inventors, and the gist of the present invention is as follows.
- the treated film contains carbon black and one or more oxides selected from the group consisting of Zr oxide, Zn oxide, and Ti oxide, and the carbon black and the oxide are , the surface treatment film is dispersed throughout the surface treatment film, the surface treatment film has a silica content of 0 to 0.3 g / m 2 , and the carbon black and the oxide adhesion amount are each X CB (g/m 2 ) and X Oxide (g/m 2 ), a steel sheet for hot stamping that satisfies the following formula (1).
- the adhesion amount X CB of the carbon black is 0.030 g/m 2 or more, and the adhesion amount X Oxide of the oxide is 0.030 g/m 2 or more.
- [1] to [3] The steel plate for hot stamping according to any one of .
- [5] The steel sheet for hot stamping according to any one of [1] to [4], wherein the emissivity of the surface treatment film at a wavelength of 8.0 ⁇ m at 700° C. is 60% or more.
- the surface of the steel sheet has a portion having a surface treatment film and a portion not having the surface treatment film, and the surface treatment film is composed of Zr oxide, Zn oxide, and Ti oxidation
- the surface treatment film contains one or more oxides selected from the group consisting of substances, and the adhesion amount X Oxide of the oxide is 0.030 g / m 2 or more, and the surface treatment film has a silica content is between 0 and 0.3 g/m 2 .
- FIG. 4 is a diagram schematically showing the start time and completion time of austenitization in a film-coated region and a non-coated region during hot stamp heating.
- FIG. 2 is a diagram schematically showing a coated portion and its central portion (P1) and an uncoated portion and its central portion (P2) on the surface of a steel sheet for hot stamping.
- Step plate for hot stamping The steel sheets for hot stamping according to embodiments of the present invention described below are suitable for manufacturing parts having portions with different strengths.
- Such a steel sheet for hot stamping has a portion having a surface treatment film having an emissivity of 60% or more at a wavelength of 8.0 ⁇ m at 25° C. and a portion having no such surface treatment film on the surface of the steel sheet. It is what I did.
- the emissivity at a wavelength of 8.0 ⁇ m at 25° C. can be increased to 60% or more by applying the surface treatment film to a portion of the steel sheet as described above.
- the type of steel sheet that serves as the base material is not particularly limited.
- Examples of such steel sheets include various hot-rolled steel sheets, cold-rolled steel sheets, and plated steel sheets.
- Galvanized steel sheets include, for example, steel sheets subjected to hot-dip aluminum plating, hot-dip galvanizing, alloyed hot-dip galvanizing, electro-galvanizing, etc., but are limited to these galvanized steel sheets as long as they can be applied to hot stamping. not a thing
- a specific surface treatment film is applied only to a portion of the steel plate surface to increase the heating rate of the film-coated portion during hot stamping heating. After the film-coated portion reaches a temperature of Ac3 or higher and the non-coated portion reaches a temperature of less than Ac3, the steel plate is hot-stamped to locally harden the film-coated portion (martensite structure). make it possible to
- a surface treatment film with high emissivity is applied to part of the steel plate surface.
- Specific methods for applying the surface treatment film include methods such as coating and lamination, but are not limited to these methods.
- the surface treatment film as described above may be applied to only one side of the steel sheet, or may be applied to both sides of the steel sheet.
- the emissivity at a wavelength of 8.0 ⁇ m at 25° C. in the region provided with the surface treatment film on the surface of the steel sheet is 60% or more.
- the emissivity at a wavelength of 8.0 ⁇ m at 25° C. of the region provided with the surface treatment film is preferably 70% or more, more preferably 80% or more.
- the emissivity measurement method can be carried out as described in the Japanese Industrial Standard JIS R 1801 (2002).
- the sample is set in a Fourier transform infrared spectrophotometer, the radiation intensity is measured at a wavelength of 8.0 ⁇ m at 25° C., and the emissivity is calculated.
- a surface treatment film When applying a surface treatment film only to a part of the steel plate surface by painting, for example, an organic or inorganic treatment liquid containing carbon black and metal oxide is applied to a part of the steel plate surface with a roll coater or a curtain coater. After coating, a surface treatment film can be applied by drying the volatile components in the treatment liquid. Also, by coating a part of the steel sheet with a polyester tape or another material and then coating the steel sheet with the treatment liquid, a film can be applied to any part of the surface of the steel sheet.
- the emissivity at a wavelength of 8.0 ⁇ m at 25° C. of the portion provided with the surface treatment film is 60% or more. If the emissivity at a wavelength of 8.0 ⁇ m at 25° C. is less than 60%, the difference in temperature rise rate from that of the portion to which the surface treatment film is not applied becomes small. As a result, it is not possible to ensure the hardness difference after heating and cooling in hot stamping, and the degree of freedom in the timing of removing the steel sheet from the heating furnace to ensure it is reduced, which imposes a burden on manufacturing, making it lightweight as an automobile part. It becomes difficult to achieve both reduction and safety performance.
- the emissivity at a wavelength of 8.0 ⁇ m at 25° C. is preferably 80% or more.
- the emissivity at a wavelength of 8.0 ⁇ m at 25° C. is 80% or more, it becomes easier to secure the above hardness difference, and it becomes possible to further reduce the load on manufacturing.
- the surface treatment film according to the present embodiment contains carbon black and specific metal oxides as detailed below. Moreover, the surface treatment film according to the present embodiment may further contain a binder component, various additives, and the like, if necessary. Furthermore, the surface treatment film according to the present embodiment may contain no silica or may contain silica within a certain range. A desired emissivity can be achieved by adjusting the contents of carbon black and metal oxides, the thickness of the surface treatment film, and the like.
- the surface treatment film according to the present embodiment contains carbon black and one or more oxides selected from the group consisting of Zr oxide, Zn oxide, and Ti oxide. Moreover, the carbon black and the oxide are dispersed throughout the surface treatment film. Further, when the carbon black adhesion amount is represented by X CB (g/m 2 ) and the oxide adhesion amount is represented by X Oxide (g/m 2 ), the surface treatment film according to the present embodiment is expressed by the following formula ( 1) is satisfied.
- Equation 1 defines the relational expression between the rate of increase (%) of the rate of temperature increase (°C/s) and the adhesion amount of carbon black and oxides. More specifically, with regard to the rate of increase in temperature increase rate, carbon black functions as a heat absorbing material in the range up to 700 ° C., and in the range of 700 ° C. or higher, Zr oxide and Zn oxide that remain even in such a temperature range , Ti oxide functions as a heat absorbing material.
- the surface treatment film according to the present embodiment can be formed by applying a treatment liquid containing carbon black and specific oxides to desired portions of the steel sheet.
- a treatment liquid containing carbon black and specific oxides to desired portions of the steel sheet.
- carbon black and oxides are dispersed throughout the surface treatment film. Since the carbon black and the oxide are dispersed throughout the surface treatment film, the emissivity of the surface treatment film at a wavelength of 8.0 ⁇ m at 25° C. can be made uniform throughout the film.
- the part to which the surface treatment film according to the present embodiment is applied is hot stamped, the surface treatment film as a whole can be evenly heated.
- Such a distribution state of carbon black and oxides is obtained by analyzing the surface treatment film with an electron probe microanalyzer (EPMA), an element derived from carbon black (e.g., C), and an oxide derived from This can be confirmed by surface analysis of the elements (that is, Zr, Zn, and Ti).
- EPMA electron probe microanalyzer
- the surface treatment film according to the present embodiment satisfies the relationship expressed by the above formula (1) between the carbon black adhesion amount X CB and the oxide adhesion amount X Oxide , so that the wavelength at 25° C. is 8.5.
- the emissivity at 0 ⁇ m becomes 60% or more, and the difference in the rate of temperature rise from the portion where the surface treatment film does not exist becomes remarkable. If the value defined by the middle term of the above formula (1) is less than 118.9, the amounts of carbon black and oxide attached are insufficient, and the above emissivity cannot be achieved.
- the value defined by the middle term of the above formula (1) is preferably 119.0 or more, more preferably 170.0 or more, and even more preferably 220.0 or more.
- the value defined by the middle term of the above formula (1) exceeds 332.0, the adhesion of the coating is lowered, which is not preferable.
- the value defined by the middle term in formula (1) is preferably 330.0 or less, more preferably 310.0 or less, and even more preferably 300.0 or less.
- the carbon black adhesion amount X CB in the surface treatment film can be measured as follows by cross-sectional analysis of the surface treatment film using a transmission electron microscope (TEM). . That is, the range of the region represented by the film thickness ⁇ 5 ⁇ m is subjected to cross-sectional analysis by TEM-EDS analysis, and the film thickness of the surface treatment film and the area ratio occupied by particles having a carbon content of 70% by mass or more are determined. Measure. When the film thickness is d ( ⁇ m) and the area ratio is a (%), the value represented by d ⁇ a is the carbon black adhesion amount X CB (g/m 2 ).
- TEM transmission electron microscope
- the adhesion amount X Oxide of the oxide of at least one of Zr, Zn, and Ti in the surface treatment film is Zr oxide, Zn oxide, and Ti oxide (that is, ZrO 2 , ZnO, TiO 2 ). means the amount of metal Zr, metal Zn, and metal Ti attached per unit area.
- the amount X Oxide of these oxides is determined by elemental analysis from the surface of the surface treatment film using a fluorescent X-ray analyzer (ZSX Primus manufactured by RIGAKU Co., Ltd.) to quantify metal Zr, metal Zn and metal Ti. can ask.
- the steel sheet for hot stamping according to the present embodiment has the characteristics described above, so that the emissivity at a wavelength of 8.0 ⁇ m at 700° C. can be 60% or more. Substances contained in the surface treatment film, which are characteristic for realizing the above emissivity, will be described in more detail below.
- the carbon black adhesion amount X CB in the surface treatment film is preferably 0.030 g/m 2 or more.
- the adhesion amount X CB is more preferably 0.100 g/m 2 or more.
- the upper limit of the adhesion amount XCB is a value determined by the above formula (1).
- the adhesion amount X CB is preferably 0.800 g/m 2 or less, more preferably 0.600 g/m 2 or less.
- the surface treatment film more preferably contains 5.0 to 40.0% by volume of carbon black.
- Carbon black has the effect of increasing the rate of temperature rise particularly in the region up to 700°C.
- the thickness of the surface treatment film may vary locally due to factors such as the roughness and waviness of the steel sheet, or the difference in volatilization speed of volatile components such as water in the treatment liquid during film formation. At this time, if the carbon black content is 5.0% by volume or more, the difference between the portion that looks black due to the carbon black and the other portion can be suppressed, and the design can be maintained, which is preferable in terms of appearance.
- the carbon black content in the surface treatment film is 40.0% by volume or less, it is possible to suppress deterioration in paint adhesion after hot stamp heating. Although the mechanism is not clear, it is speculated that by suppressing the remaining carbon black or compounds derived from carbon black oxides, etc., the hindrance of bonding between the paint and the substrate is suppressed. be done.
- carbon black disappears when heated to high temperatures. Therefore, by including carbon black in the surface treatment film, it is possible to maintain performance after hot stamping, such as adhesion after painting.
- the carbon black content in the surface treatment film is 5.0% by volume or more.
- the carbon black content in the surface treatment film is 8.0% by volume or more.
- the carbon black content in the surface treatment film is 40.0% by volume or less.
- the carbon black content in the surface treatment film is 30.0% by volume or less. By setting the carbon black content in the surface treatment film to 30.0% by volume or less, it is possible to further reduce the cost of the film.
- the total adhesion amount X Oxide of Zr oxide, Zn oxide, and Ti oxide in the surface treatment film is 0.030 g / m 2 or more at the part to which the surface treatment film is applied.
- the adhesion amount X Oxide is more preferably 0.060 g/m 2 or more.
- the upper limit of the adhesion amount X Oxide is a value determined by the above formula (1).
- the adhesion amount X Oxide is preferably 0.500 g/m 2 or less, more preferably 0.300 g/m 2 or less.
- the surface treatment film more preferably contains 1.0 to 30.0% by volume of Zr oxide, Zn oxide and Ti oxide in total. Oxides of these elements (that is, metal oxides of Zr, Zn, and Ti) remain in the surface treatment film even when heated to a high temperature of 700°C or higher, where the effect of carbon black is reduced. . As a result, since these metal oxides have a higher emissivity than the steel plate surface or the plated surface at a high temperature of 700 ° C. or higher, the amount of heat input due to radiant heat from the heating atmosphere is reduced. growing. As a result, even at a high temperature of 700° C. or higher, the effect of increasing the rate of temperature increase can be maintained.
- the content of these metal oxides is 1.0% by volume or more, the effect of increasing the rate of temperature increase can be sufficiently obtained. More preferably, the content of these metal oxides is 3.0% by volume or more. On the other hand, when the content of these metal oxides is 30% by volume or less, the film cost can be suppressed, which is economically preferable. More preferably, the content of these metal oxides is 25.0% by volume or less.
- the content (% by volume) of various compounds such as carbon black and metal oxides in the surface treatment film was determined by observing the cross section with a scanning electron microscope (SEM) by polishing after embedding the sample in resin. , can be calculated from the area ratio of the cross section. Compounds can also be estimated by quantitative analysis using the EDX function attached to the SEM.
- SEM scanning electron microscope
- the ratio X Oxide /X CB between the carbon black adhesion amount X CB (g/m 2 ) and the oxide adhesion amount X Oxide (g/m 2 ) is 0 .20 or more and 200.00 or less.
- the ratio X Oxide /X CB is more preferably 0.40 to 10.00, still more preferably 0.60 to 5.00.
- the surface treatment film according to the present embodiment can contain various binder components and additives in addition to the above carbon black and metal oxides.
- the binder component that can be contained in the surface treatment film according to this embodiment is preferably a water-dispersible or water-soluble resin.
- the content of the binder component selected from water-dispersible or water-soluble resins is preferably 40% by volume or more with respect to the total volume of the surface treatment film.
- the binder component selected from water-dispersible or water-soluble resins various known water-dispersible or water-soluble resins can be used.
- water-dispersible or water-soluble resins include polyurethane resins, polyester resins, acrylic resins, epoxy resins, fluorine resins, polyamide resins, polyolefin resins, and hydrolyzed/condensed silane coupling agents. Examples thereof include the resulting polymer compound.
- the binder component is one or more selected from the group consisting of polyester resins, polyurethane resins, polyolefin resins, acrylic resins, epoxy resins, fluororesins, and polyamide resins.
- the total content of the used some resin is treated as content of a binder component.
- the polyurethane resin is preferably a polyether-based polyurethane resin.
- a polyether-based polyurethane resin can prevent the occurrence of hydrolysis due to acid or alkali compared to a polyester-based polyurethane resin, and is harder than a polycarbonate-based polyurethane resin. This is because, by suppressing the formation of a brittle film, it is possible to ensure adhesion during processing and corrosion resistance of the processed portion.
- the content of the polyurethane resin a calibration curve showing the relationship between the content and the intensity of the characteristic absorption was prepared using a sample of which the content was known in advance. The content can be specified from the intensity.
- the surface treatment film according to the present embodiment contains additives such as a leveling agent, a water-soluble solvent, a metal stabilizer, an etching inhibitor, etc., as additives during the preparation of the treatment solution before forming the film, within a range that does not impair the effects of the present invention. It is possible to contain various additives such as
- leveling agents include nonionic or cationic surfactants, such as polyethylene oxide or polypropylene oxide adducts, acetylene glycol compounds, and the like.
- water-soluble solvents examples include alcohols such as ethanol, isopropyl alcohol, t-butyl alcohol and propylene glycol; cellosolves such as ethylene glycol monobutyl ether and ethylene glycol monoethyl ether; esters such as ethyl acetate and butyl acetate; and ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone.
- alcohols such as ethanol, isopropyl alcohol, t-butyl alcohol and propylene glycol
- cellosolves such as ethylene glycol monobutyl ether and ethylene glycol monoethyl ether
- esters such as ethyl acetate and butyl acetate
- ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone.
- metal stabilizers examples include chelate compounds such as EDTA (ethylenediaminetetraacetic acid) and DTPA (diethylenetriaminepentaacetic acid).
- etching inhibitors include amine compounds such as ethylenediamine, triethylenepentamine, guanidine and pyrimidine.
- the surface treatment film according to the present embodiment may contain no silica or may contain silica within a certain range. More specifically, in the surface treatment film according to this embodiment, the silica content is 0 to 0.3 g/m 2 . If the silica content exceeds 0.3 g/m 2 , the effect of raising the temperature cannot be expected, but the cost becomes high, which is not preferable from the economic point of view. In addition, since silica is a substance with low electrical conductivity, a silica content exceeding 0.3 g/m 2 is not preferable in terms of weldability after hot stamping. When silica is contained in the surface treatment film, the smaller the content of silica, the better.
- the silica content of the surface treatment film is more preferably 0.10 g/m 2 or less, still more preferably 0.05 g/m 2 or less.
- the film thickness of the surface treatment film containing the above components is preferably 0.5 to 5.0 ⁇ m, for example.
- the emissivity at a wavelength of 8.0 ⁇ m at 25° C. can more reliably be 60% or more.
- the film thickness of the surface treatment film is more preferably 1.0 to 3.0 ⁇ m.
- the hot stamping steel sheet according to the present embodiment preferably has a metal plating layer at least partly between the base steel sheet and the surface treatment film on one or both sides of the hot stamping steel sheet.
- a metal plating layer By having a metal plating layer, the post-coating corrosion resistance after hot stamping can be further improved.
- the presence of the metal plating layer can prevent the formation of iron scales due to heating during hot stamping. Iron scale contaminates the heating furnace and adheres to the rolls used for transportation, thus becoming a burden on production. Therefore, when iron scale is formed, a process such as shot blasting is required to remove the iron scale, which is economically unfavorable.
- the type of metal plating layer is not particularly limited.
- Examples of metal plating that constitutes such a metal plating layer include aluminum plating, Al-Si plating, zinc plating, alloyed zinc plating, Zn-Ni plating, Zn-Al-Mg plating, and Zn-Al-Mg-Si plating. etc.
- the method for forming the metal plating layer includes hot dip plating, electroplating, physical vapor deposition, chemical vapor deposition, etc., but is not particularly limited.
- the base material steel sheet of the steel sheet for hot stamping according to the present embodiment is not particularly limited as long as it is a steel sheet that can be suitably used for the hot stamping method.
- the chemical composition is mass%, C: 0.10 to 0.40%, Si: 0.01 to 0.60%, Mn: 0 .50-3.00%, P: 0.05% or less, S: 0.020% or less, Al: 0.10% or less, Ti: 0.01-0.10%, B: 0.0001-0 0.0100%, N: 0.010% or less, and the balance being Fe and impurities.
- examples of the form of the base material steel plate include steel plates such as hot-rolled steel plates and cold-rolled steel plates.
- the chemical composition of the base steel sheet will be described in detail below. In the following description of the chemical composition of the base steel sheet, the notation of "%” means “% by mass” unless otherwise specified.
- [C: 0.10 to 0.40%] C is contained to ensure the desired mechanical strength.
- the C content is preferably 0.10% or more.
- the C content is more preferably 0.20% or more.
- the C content is preferably 0.40% or less.
- the C content is more preferably 0.35% or less.
- Si is one of the strength-improving elements that improve mechanical strength, and like C, it is contained to ensure the desired mechanical strength.
- the Si content is preferably 0.01% or more.
- the Si content is more preferably 0.10% or more.
- Si is also an easily oxidizable element, when the Si content is 0.60% or less, the wettability during hot dip Al plating decreases due to the influence of the Si oxide formed on the surface layer of the steel sheet. It is suppressed, and the occurrence of non-plating can be suppressed. Therefore, the Si content is preferably 0.60% or less.
- the Si content is more preferably 0.40% or less.
- Mn is one of the strengthening elements that strengthen steel and is also one of the elements that improve hardenability. Furthermore, Mn is an element effective in preventing hot embrittlement caused by S, which is one of the impurities. These effects are sufficiently obtained when the Mn content is 0.50% or more. Therefore, the Mn content is preferably 0.50% or more in order to reliably exhibit the above effects. The Mn content is more preferably 0.80% or more. On the other hand, since Mn is an austenite-forming element, when the Mn content is 3.00% or less, the residual austenite phase does not become too large, and the decrease in strength is suppressed. Therefore, the Mn content is preferably 3.00% or less. The Mn content is more preferably 1.50% or less.
- P is an impurity contained in steel.
- the P content is 0.05% or less, it is possible to suppress the deterioration of the toughness of the base material of the hot-stamped compact due to the segregation of P contained in the steel sheet at the grain boundaries of the steel sheet. A decrease in delayed fracture resistance can be suppressed. Therefore, the P content is preferably 0.05% or less, and it is preferable to reduce the P content as much as possible.
- S is an impurity contained in steel.
- the S content is 0.020% or less, it is possible to suppress the deterioration of the toughness of the steel sheet due to the formation of sulfides by the S contained in the steel sheet, and to suppress the deterioration of the resistance to delayed fracture of the steel sheet. Therefore, the S content is preferably 0.020% or less, and it is preferable to reduce the S content as much as possible.
- Al 0.10% or less
- Al is commonly used for the purpose of deoxidizing steel.
- the Al content of the steel sheet is preferably 0.10% or less, more preferably 0.05% or less, and even more preferably 0.01% or less.
- Ti 0.01 to 0.10%
- the Ti content is one of the strength-enhancing elements.
- the Ti content is preferably 0.01% or more in order to reliably exhibit the above effects.
- the Ti content is more preferably 0.03% or more.
- the Ti content is preferably 0.10% or less.
- the Ti content is more preferably 0.08% or less.
- B has the effect of acting during quenching and improving the strength.
- the B content is preferably 0.0001% or more.
- the B content is more preferably 0.0010% or more.
- the B content is preferably 0.0100% or less.
- the B content is more preferably 0.0040% or less.
- N is an impurity contained in steel.
- the N content is 0.010% or less, the formation of nitrides due to N contained in the steel sheet is suppressed, and a decrease in toughness of the steel sheet can be suppressed.
- B is contained in the steel sheet, the N contained in the steel sheet is suppressed from bonding with B to reduce the amount of solid solution B, and the decrease in the hardenability improvement effect of B can be suppressed. Therefore, the N content is preferably 0.010% or less, and more preferably as low as possible.
- the base steel sheet of the steel sheet for hot stamping according to the present embodiment further includes Cr, Mo, Ni, Co, Cu, Mo, V, Nb, Sn, W, Ca, REM, O, Elements such as Sb may be contained.
- Cr 0 to 1.00%
- Cr is an element that improves the hardenability of the steel sheet.
- the Cr content is preferably 0.01% or more.
- the Cr content is preferably 1.00% or less.
- Ni and Co are elements that improve the hardenability of steel and ensure stable strength of steel plate members after hardening.
- the Ni content is preferably 0.10% or more, and the Co content is preferably 0.10% or more.
- the Ni content and the Co content are each 2.00% or less, economic efficiency can be enhanced while sufficiently obtaining the above effects. Therefore, when Ni is included, the Ni content is preferably 2.00% or less, and the Co content is preferably 2.00% or less.
- Cu is an element that enhances the hardenability of steel and makes it possible to stably ensure the strength of steel plate members after hardening. Cu also improves pitting resistance in corrosive environments.
- the Cu content is preferably 0.100% or more in order to sufficiently exhibit such effects.
- the content of Cu is preferably 1.000% or less.
- Mo is an element that enhances the hardenability of steel and makes it possible to stably ensure the strength of steel plate members after hardening.
- the Mo content is preferably 0.10% or more.
- Mo content is preferably 1.00% or less.
- V is an element that enhances the hardenability of steel and makes it possible to stably secure the strength of steel plate members after hardening.
- the V content is preferably 0.10% or more.
- the V content is preferably 1.00% or less.
- Nb is an element that enhances the hardenability of steel and makes it possible to stably secure the strength of steel plate members after hardening.
- the Nb content is preferably 0.01% or more.
- the Nb content is preferably 1.00% or less.
- Sn is an element that improves pitting corrosion resistance in corrosive environments.
- the Sn content is preferably 0.01% or more in order to sufficiently exhibit such effects.
- the Sn content is preferably 1.00% or less.
- W is an element that enhances the hardenability of steel and makes it possible to stably secure the strength of steel plate members after hardening. W also improves pitting resistance in corrosive environments. In order to fully exhibit such effects, the W content is preferably 0.01% or more. On the other hand, when the W content is 1.00% or less, economic efficiency can be enhanced while sufficiently obtaining the above effects. Therefore, when W is included, the W content is preferably 1.00% or less.
- Ca is an element that has the effect of refining inclusions in steel and improving toughness and ductility after quenching.
- the Ca content is preferably 0.001% or more, more preferably 0.002% or more.
- the content of Ca is preferably 0.010% or less, more preferably 0.004% or less.
- REM 0-0.30%
- REM is an element that has the effect of refining inclusions in steel and improving toughness and ductility after quenching.
- the REM content is preferably 0.001% or more, more preferably 0.002% or more.
- the REM content is preferably 0.30% or less, more preferably 0.20% or less.
- REM refers to a total of 17 elements of Sc, Y and lanthanoids, and the content of REM above means the total content of these elements.
- REMs are added to molten steel using, for example, Fe--Si--REM alloys, which include, for example, Ce, La, Nd, Pr.
- O is not an essential element and is contained as an impurity in steel, for example.
- O is an element that causes the deterioration of the properties of the steel sheet, such as forming an oxide and becoming a starting point of fracture.
- oxides existing near the surface of the steel sheet may cause surface flaws and deteriorate the appearance quality. Therefore, the lower the O content, the better.
- the O content is preferably 0.0070% or less.
- the lower limit of the O content is not particularly limited, and may be 0%, but the practical lower limit of the O content in terms of refining is 0.0005%.
- the lower limit of the Sb content is not particularly limited, and may be 0%.
- Sb is an effective element for improving wettability and adhesion of plating. In order to obtain this effect, it is preferable to contain 0.001% or more of Sb.
- the Sb content is preferably 0.100% or less
- the balance other than the above components is Fe and impurities.
- the base material steel plate may also contain other impurities that may be mixed during the manufacturing process or the like.
- impurities include, for example, Zn (zinc).
- the portion of the steel plate having the above chemical composition that has been given a surface treatment film can be made into a hot stamped member having a tensile strength of approximately 1000 MPa or more by heating and quenching by the hot stamping method.
- press working can be performed in a state of being softened at a high temperature, so that molding can be easily performed.
- the steel plate for hot stamping according to the present embodiment does not require the use of a plurality of steel plates, compared to the method of hot stamping after welding different steel plates or the method of changing the cooling rate depending on the part by controlling the temperature of the mold. , Preliminary welding equipment and processes are not required. In addition, equipment for changing the temperature of the mold and its running cost are not required. Therefore, it is economically preferable.
- a part having portions with different strengths in this way can be manufactured using a steel plate for hot stamping having a region where a surface treatment film is applied to a part of the surface as described above.
- a surface treatment film is applied to a part of the surface of a metal material such as a coiled steel plate, and parts with different emissivity are formed in advance.
- the steel sheet for hot stamping according to the present embodiment is obtained by performing various processing such as cutting and punching with a press.
- the steel sheet for hot stamping according to the present embodiment can also be obtained by applying a surface treatment film to a steel sheet that has been cut or punched by a press.
- the emissivity can be changed continuously by changing the film thickness of the surface treatment film.
- the steel plate for hot stamping to which the surface treatment film is applied as described above is hot stamped.
- heating devices include electric heating furnaces, gas heating furnaces, far-infrared furnaces, and general heating devices equipped with infrared heaters.
- the area to which the surface treatment film is applied (film-coated area) has an increased emissivity, and the heat transfer effect due to radiation is large, so the temperature rise rate is high. The temperature rise rate is slow.
- the film-coated portion which is rapidly heated to a high temperature, is heated to a temperature higher than the Ac3 point at which the metal structure transforms into the austenite phase.
- the non-coated part has a slow temperature rise rate, even if the coated part reaches the temperature of Ac 3 point or higher, the temperature should be kept below Ac 3 point so that the metal structure does not completely transform into an austenite single phase. can be done.
- the heating device and the like to be used may be appropriately controlled so as to realize the above state.
- the heated steel plate is shaped and cooled.
- the portion heated to the Ac3 point temperature or higher where the metal structure of the steel transforms into the austenite phase is quenched to increase its strength, while it is heated to a temperature below the Ac3 point temperature to complete the transformation to the austenite single phase.
- the strength is relatively low at the site where it is not.
- a part that is, a hot stamped member
- the difference in strength between the portions with different strengths can be measured by Vickers hardness ( Load F: 50 kgf, 1 kgf is about 9.8 N.), it can be 150 Hv or more.
- the hot stamped member obtained as described above has a portion having the surface treatment film and a portion not having the surface treatment film on the surface of the steel sheet.
- the surface treatment film contains one or more oxides selected from the group consisting of Zr oxide, Zn oxide, and Ti oxide, and the amount of oxide adhesion X Oxide is 0.030 g. /m 2 or more. Further, such a surface treatment film has a silica content of 0 to 0.3 g/m 2 .
- the carbon black present in the surface treatment film of the steel sheet for hot stamping used as the material for the hot stamping member disappears through the hot stamping process, leaving the metal oxide.
- the adhesion amount X Oxide of the oxide present in the surface treatment film of the hot stamping member depends on the adhesion amount of the oxide in the surface treatment film of the hot stamping steel plate used as the material, but the upper limit is roughly 0.600 g/ m2 .
- Such a hot stamped member has a maximum hardness HVmax and a minimum It is preferable that a portion exhibiting a hardness HVmin exists and a hardness difference ⁇ HV between the maximum hardness HVmax and the minimum hardness HVmin is 150 or more.
- both the portion exhibiting the maximum hardness HVmax and the portion exhibiting the minimum hardness HVmin are made of a common material (that is, the hot stamping steel sheet according to the present embodiment).
- the "common member” is the ratio of the content of specific elements (for example, C, Si, Mn, P, S, Al, Ti, B, N) in the 0.05 mm field of view near the center of the plate thickness ( ratio between members) is anywhere within the range of 0.80 times to 1.2 times.
- members having the same composition when confirmed at the center of plate thickness and manufactured through the same manufacturing process are the “common members” as used herein.
- such a common material may be composed of a single steel plate, or a plurality of identical steel plates (that is, the hot stamping steel plate according to the present embodiment) joined by some method. can be anything.
- a steel plate with high mechanical strength meaning various properties related to mechanical deformation and destruction such as tensile strength, yield point, elongation, reduction of area, hardness, impact value, fatigue strength, etc.
- Table 1 shows the chemical composition of the base steel sheet before plating, which was used in the steel sheets for hot stamping shown in the following examples.
- a surface treatment film was applied to the base material steel plates (steel Nos. S1 to S18) having the chemical compositions shown in Table 1. More specifically, as shown in FIG. 2, a steel plate having a width of 100 mm, a length of 200 mm, and a thickness of 1.2 mm is provided with a surface treatment film on one or both sides of the upper 100 mm of the 200 mm in the length direction. The other 100 mm was treated as a non-coated portion without applying a surface treatment film.
- water-based acrylic resins as binder components, compounds such as commercially available carbon black, TiO 2 , ZrO 2 , ZnO, Fe 2 O 3 , Fe 3 O 4 , CuO, SiO 2 , TiC, TiN, SiC and SiN was applied to a part of the base steel plate using an industrial inkjet printer, and dried to give a surface treatment film.
- silica was added to some of the aqueous treatment liquids. The film thickness of the surface treatment film was within the range of 1.0 to 2.5 ⁇ m, and when both surfaces were coated, the same type of coating was applied to both surfaces.
- thermocouples were connected to the central portion (P1) of the portion to which the surface treatment film was applied (film portion) and the center portion (P2) of the portion without the film (non-film portion) shown in FIG. , so that the temperature at each position can be measured. Then, the steel plate was heated in an electric heating furnace with a set temperature of 900°C, and the steel plate was removed from the heating furnace when the temperature of the film-applied portion reached 880°C. The steel plate was rapidly cooled in a flat die to obtain a hot stamped member.
- the portion to which the surface treatment film is applied becomes the portion exhibiting the maximum hardness HVmax, and the surface treatment film is not applied.
- the portion (non-coated portion) exhibits the minimum hardness HVmin.
- some base steel sheets are subjected to Al-10 mass% Si plating, Zn plating, or Al plating by hot dip plating, and then the above surface treatment film is applied, or electroplating After applying Zn-3 mass % Ni plating by the method, the above surface treatment film was applied.
- the coating amount was adjusted to 70 g/m 2 per side by the gas wiping method.
- the coating weight on one side was adjusted to 20 g/m 2 .
- the film composition of the site to which the surface treatment film was applied and the difference in Vickers hardness between P1 and P2 of the resulting hot stamped member were investigated, and in some examples, further appearance, paint adhesion, corrosion resistance after painting investigated.
- the evaluation method for each evaluation item was as follows.
- Tables 2, 3, 4, and 5 show the evaluation results obtained in Examples 1 to 4, which were carried out under the above conditions.
- Example 1 In Table 2 shown below, A1 to 21 are examples, and a1 to a3 are comparative examples.
- the total content of the compounds other than the binder component in the aqueous treatment liquid was within the range of 2 to 50% by volume with respect to the volume of the entire solid content.
- a water-based treatment liquid having a solid content concentration of 10 to 40% by mass was applied to a steel plate so as to have a liquid film thickness of 3 ⁇ m to 25 ⁇ m, followed by drying to obtain a film.
- the atmosphere during drying was air or nitrogen atmosphere, and the temperature was 100 to 300°C.
- the total content of the compounds in the aqueous treatment liquid is the total content of the compounds in the surface treatment film obtained after drying.
- the emissivity value at a wavelength of 8.0 ⁇ m was adjusted by adjusting the content of the compound and the adhesion amount of the surface treatment film.
- the emissivity at 25° C. and a wavelength of 8.0 ⁇ m in the coated portion P1 is as small as 58, 56, and 58%, and the difference in hardness between the coated portion P1 and the non-coated portion P2 of the hot stamping member. had a Vickers hardness of ⁇ HV of less than 150 (grade 1). Since the coatings a1 to a3 have an emissivity of less than 60% at a wavelength of 8.0 ⁇ m at 25° C., there is a large difference in the rate of temperature increase during heating between the coated portion P1 and the non-coated portion P2. Therefore, it is presumed that the structure of the hot stamped member did not have a Vickers hardness difference of ⁇ HV of 150 or more.
- invention examples A1 to A21 had an emissivity of 60% or more at 25°C and a wavelength of 8.0 ⁇ m.
- the difference in hardness between the coated portion and the uncoated portion of the hot stamped member was HV 150 or more and less than 200 (mark 2) in terms of Vickers hardness.
- Example 2 In Table 3, in Invention Example B1, carbon black (CB) was 2.7% by volume in the surface treatment film, and TiO 2 was 0.6% by volume in the surface treatment film. As a result, the emissivity at 25° C. and a wavelength of 8.0 ⁇ m in the coated portion was 86%, and the hardness difference between the coated portion and the non-coated portion of the hot stamping member was HV 150 or more and less than 200 in Vickers hardness (grade 2). became. The paint adhesion was rated 3, but the appearance was rated 1.
- Example 3 In Table 4, Invention Example C1 in which the content of Zn oxide in the surface treatment film was 0.2% by volume, Invention Example C2 in which the content of Ti oxide in the surface treatment film was 0.3% by volume, And, compared to Invention Example C6 in which the content of Ti oxide in the surface treatment film was 37.5% by volume, as in Invention Examples C3 to C5, the content of Ti oxide and Zr oxide in the surface treatment film was reduced. By setting the content to 1.0 to 30.0% by volume, the difference in hardness between the film-coated and non-coated regions of the hot stamping member was further increased (grade 3).
- the reason for the large hardness difference is that the emissivity of the oxide is higher than that of the compound on the steel plate surface, and the presence of the interface between the steel plate surface and the oxide particles prevents the reflection of infrared rays to the sample.
- the reason for this is thought to be that the difference in heating rate from the non-coated portion increased due to the increase in the amount of heat input.
- Example 4 In Table 5, in Example D1, the emissivity at the coated portion at 700° C. and the wavelength of 8.0 ⁇ m was 56%, and the hardness difference between the coated portion and the non-coated portion of the hot stamping member was HV 150 or higher. It became less than 200 (rating 2). On the other hand, in invention examples D2 to D6 in which the emissivity at the coated portion at 700° C. and the wavelength of 8.0 ⁇ m is 60% or more, the hardness difference between the coated portion and the non-coated portion of the hot stamping member is HV200 or more ( A score of 3) was obtained.
- Example 5 In Table 6, as is clear from a comparison of Invention Examples E1 to E5 and E6, the corrosion resistance after painting was "1" in Invention Example E6 without plating, whereas Al-10 mass% Si, or The corrosion resistance after painting was improved to "2" or "3" in invention examples E1 to E5 having Zn-3% by mass Ni plating.
- the present invention it is possible to rapidly heat a region provided with a surface treatment film having an increased emissivity at a wavelength of 8.0 ⁇ m at 25° C. by increasing heat transfer by radiation.
- a surface treatment film having an increased emissivity at a wavelength of 8.0 ⁇ m at 25° C. By making a difference in hardenability, it is possible to provide portions having different strengths in a hot stamped member from a single steel plate. Therefore, industrial applicability is high.
Abstract
Description
118.9≦24280/{6700/(100+76×XCB)+18000/(130+65×XOxide)}≦332.0 ・・・ 式(1)
[2]前記表面処理皮膜は、前記カーボンブラックを5.0~40.0体積%含有し、前記酸化物を1.0~30.0体積%含有する、[1]に記載のホットスタンプ用鋼板。
[3]前記カーボンブラックの付着量XCB(g/m2)と前記酸化物の付着量XOxide(g/m2)との比率XOxide/XCBは、0.20以上200.00以下である、[1]又は[2]に記載のホットスタンプ用鋼板。
[4]前記カーボンブラックの付着量XCBは、0.030g/m2以上であり、前記酸化物の付着量XOxideは、0.030g/m2以上である、[1]~[3]の何れか1つに記載のホットスタンプ用鋼板。
[5]前記表面処理皮膜の700℃における波長8.0μmでの放射率は、60%以上である、[1]~[4]の何れか1つに記載のホットスタンプ用鋼板。
[6]前記ホットスタンプ用鋼板の片面又は両面において、前記鋼板の基材と前記表面処理皮膜との間に、金属めっき層を有する、[1]~[5]の何れか1つに記載のホットスタンプ用鋼板。
[7]鋼板の表面に、表面処理皮膜を有する部位と、前記表面処理皮膜を有していない部位と、を有し、前記表面処理皮膜は、Zr酸化物、Zn酸化物、及び、Ti酸化物からなる群より選択される1種以上の酸化物を含有し、かつ、前記酸化物の付着量XOxideは、0.030g/m2以上であり、前記表面処理皮膜は、シリカの含有量が0~0.3g/m2である、ホットスタンプ部材。
[8]JIS Z 2244(2009)で規定されるビッカース硬度を測定したときに、最大硬度HVmaxを示す部位と、最小硬度HVminを示す部位と、が存在し、かつ、前記最大硬度HVmaxと前記最小硬度HVminとの硬度差ΔHVが、150以上である、[7]に記載のホットスタンプ部材。
[9]前記最大硬度HVmaxを示す部位と、前記最小硬度HVminを示す部位の双方は、共通の素材で構成された領域内に存在する、[8]に記載のホットスタンプ部材。
以下で説明する、本発明の実施形態に係るホットスタンプ用鋼板は、強度の異なる部分を有する部品の製造に適したものである。かかるホットスタンプ用鋼板は、25℃における波長8.0μmでの放射率が60%以上である表面処理皮膜を有する部位と、かかる表面処理皮膜を有していない部位と、を鋼板の表面に有したものである。本実施形態では、上記のように鋼板の一部に表面処理皮膜を付与することにより、25℃における波長8.0μmでの放射率を60%以上に高めることができる。
本実施形態に係るホットスタンプ用鋼板において、表面処理皮膜を付与した部分の25℃における波長8.0μmでの放射率は、60%以上である。25℃における波長8.0μmでの放射率が60%未満になると、表面処理皮膜を付与していない部分との昇温速度の差が小さくなる。これにより、ホットスタンプでの加熱・冷却後の硬度差が確保できなかったり、確保するための加熱炉からの鋼板取り出しタイミングの自由度が低くなり製造に負荷がかかったりして、自動車部品として軽量化と安全性能の両立が難しくなる。25℃における波長8.0μmでの放射率は、80%以上であることが好ましい。25℃における波長8.0μmでの放射率が80%以上となることで、上記の硬度差をより確保しやすくなったり、製造への負荷をより削減したりすることが可能となる。なお、表面処理皮膜を付与した部分の25℃における波長8.0μmでの放射率は、高ければ高いほどよく、その上限値を規定するものではなく、100%であってもよい。
118.9≦24280/{6700/(100+76×XCB)+18000/(130+65×XOxide)}≦332.0 ・・・ 式(1)
鋼板の表面のうち、表面処理皮膜の付与された部位において、表面処理皮膜におけるカーボンブラックの付着量XCBは、0.030g/m2以上であることが好ましい。付着量XCBを0.030g/m2以上とすることで、700℃までの領域における昇温速度を、確実に大きくすることが可能となる。付着量XCBは、より好ましくは0.100g/m2以上である。一方、付着量XCBの上限値は、上記式(1)により定まる値となる。付着量XCBは、好ましくは0.800g/m2以下であり、より好ましくは0.600g/m2以下である。
鋼板の表面のうち、表面処理皮膜の付与された部位において、表面処理皮膜におけるZr酸化物、Zn酸化物、及び、Ti酸化物の合計の付着量XOxideは、0.030g/m2以上であることが好ましい。付着量XOxideを0.03g/m2以上とすることで、700℃以上の領域における昇温速度を、確実に大きくすることが可能となる。付着量XOxideは、より好ましくは0.060g/m2以上である。一方、付着量XOxideの上限値は、上記式(1)により定まる値となる。付着量XOxideは、好ましくは0.500g/m2以下であり、より好ましくは0.300g/m2以下である。
本実施形態に係る表面処理皮膜に含有されうるバインダー成分は、水分散性又は水溶解性の樹脂であることが好ましい。水分散性又は水溶解性の樹脂から選択されるバインダー成分の含有量は、表面処理皮膜の全体積に対して、40体積%以上であることが好ましい。
本実施形態に係る表面処理皮膜には、本発明の効果を損なわない範囲で、皮膜形成前の処理液作製時の添加剤として、レベリング剤、水溶性溶剤、金属安定化剤、エッチング抑制剤等といった各種の添加剤を含有させることが可能である。
本実施形態に係る表面処理皮膜は、先だって言及したように、シリカを含有していなくともよく、ある範囲内でシリカを含有していてもよい。より詳細には、本実施形態に係る表面処理皮膜において、シリカの含有量は、0~0.3g/m2である。シリカを0.3g/m2を超えて含有する場合、温度上昇効果が望めない一方で高コストとなるため、経済性の点で好ましくない。また、シリカは電気伝導性が低い物質であるため、シリカを0.3g/m2を超えて含有する場合、ホットスタンプ後の溶接性の点で好ましくない。シリカを含有させる場合における表面処理皮膜のシリカの含有量は、小さければ小さいほどよい。表面処理皮膜のシリカの含有量は、より好ましくは0.10g/m2以下であり、更に好ましくは0.05g/m2以下である。
以上のような成分を含有する表面処理皮膜の膜厚は、例えば、0.5~5.0μmとすることが好ましい。表面処理皮膜の膜厚を上記の範囲内とすることで、25℃における波長8.0μmでの放射率について、より確実に60%以上とすることができる。表面処理皮膜の膜厚は、より好ましくは、1.0~3.0μmである。
本実施形態に係るホットスタンプ用鋼板は、かかるホットスタンプ用鋼板の片面又は両面において、母材鋼板と上記表面処理皮膜との間の少なくとも一部に、金属めっき層を有することが好ましい。金属めっき層を有することにより、ホットスタンプ後の塗装後耐食性をより一層向上させることができる。また、金属めっき層が存在することで、ホットスタンプの際に、加熱により鉄スケールが生成するのを防ぐことができる。鉄スケールは、加熱炉を汚染させたり、搬送のために用いられるロールに付着したりするため、製造上の負荷になる。そのため、鉄スケールが生成した場合には、鉄スケールを除去するためにショットブラスト等の工程が必要となり、経済上好ましくない。
次に、本実施形態に係るホットスタンプ用鋼板の母材鋼板は、ホットスタンプ法に好適に利用可能な鋼板であれば、特に制限はない。本実施形態に係るホットスタンプ用鋼板に適用可能な鋼板として、例えば、化学成分が質量%で、C:0.10~0.40%、Si:0.01~0.60%、Mn:0.50~3.00%、P:0.05%以下、S:0.020%以下、Al:0.10%以下、Ti:0.01~0.10%、B:0.0001~0.0100%、N:0.010%以下を含有し、残部がFe及び不純物からなる鋼板を例示できる。また、母材鋼板の形態としては、例えば熱延鋼板や冷延鋼板などの鋼板を例示できる。以下、母材鋼板の化学成分について、詳細に説明する。なお、以下の母材鋼板の化学成分に関する説明において、「%」の表記は、特に断りのない限り「質量%」を意味する。
Cは、目的とする機械的強度を確保するために含有される。C含有量が0.10%以上であることで、十分な機械的強度の向上が得られ、Cを含有する効果が十分に得られる。そのため、C含有量は、0.10%以上であることが好ましい。C含有量は、より好ましくは0.20%以上である。一方、C含有量が0.40%以下であることで、鋼板の強度を硬化向上させつつ、伸び、絞りの低下を抑制できる。そのため、C含有量は、0.40%以下であることが好ましい。C含有量は、より好ましくは0.35%以下である。
Siは、機械的強度を向上させる強度向上元素の一つであり、Cと同様に、目的とする機械的強度を確保するために含有される。Si含有量が0.01%以上であることで、強度向上効果が十分に発揮され、十分な機械的強度の向上が得られる。そのため、Si含有量は、0.01%以上であることが好ましい。Si含有量は、より好ましくは0.10%以上である。一方、Siは易酸化性元素でもあるため、Si含有量が0.60%以下であることで、鋼板表層に形成したSi酸化物の影響による、溶融Alめっきを行う際の濡れ性の低下が抑制され、不めっきの発生が抑制できる。そのため、Si含有量は、0.60%以下であることが好ましい。Si含有量は、より好ましくは0.40%以下である。
Mnは、鋼を強化させる強化元素の1つであり、焼入れ性を高める元素の1つでもある。更に、Mnは、不純物の1つであるSによる熱間脆性を防止するのにも有効な元素である。Mn含有量が0.50%以上であることで、これらの効果が十分に得られる。そのため、上記効果を確実に発現させるために、Mn含有量は、0.50%以上であることが好ましい。Mn含有量は、より好ましくは0.80%以上である。一方、Mnはオーステナイト形成元素であるため、Mn含有量が3.00%以下であることで、残留オーステナイト相が多くなり過ぎず、強度の低下が抑制される。そのため、Mn含有量は、3.00%以下であることが好ましい。Mn含有量は、より好ましくは1.50%以下である。
Pは、鋼中に含まれる不純物である。P含有量が0.05%以下であることで、鋼板に含まれるPが鋼板の結晶粒界に偏析してホットスタンプされた成形体の母材の靭性を低下させることを抑制でき、鋼板の耐遅れ破壊性の低下を抑制できる。そのため、P含有量は0.05%以下であることが好ましく、P含有量はできる限り少なくすることが好ましい。
Sは、鋼中に含まれる不純物である。S含有量が0.020%以下であることで、鋼板に含まれるSが硫化物を形成して鋼板の靭性を低下させることを抑制でき、鋼板の耐遅れ破壊性の低下を抑制できる。そのため、S含有量は0.020%以下であることが好ましく、S含有量はできる限り少なくすることが好ましい。
Alは、一般に鋼の脱酸目的で使用される。一方、Al含有量が0.10%以下であることで、鋼板のAc3点の上昇が抑制されるため、ホットスタンプの際に鋼の焼入れ性確保に必要な加熱温度を低減でき、ホットスタンプ製造上望ましい。従って、鋼板のAl含有量は、0.10%以下が好ましく、より好ましくは0.05%以下であり、更に好ましくは0.01%以下である。
Tiは、強度強化元素の1つである。Ti含有量が0.01%以上であることで、強度向上効果や耐酸化性向上効果が十分に得られる。そのため、上記効果を確実に発現させるために、Ti含有量は、0.01%以上であることが好ましい。Ti含有量は、より好ましくは0.03%以上である。一方、Ti含有量が0.10%以下であることで、例えば炭化物や窒化物の形成が抑制され、鋼の軟質化を抑制でき、目的とする機械的強度を十分に得ることができる。従って、Ti含有量は、0.10%以下であることが好ましい。Ti含有量は、より好ましくは0.08%以下である。
Bは、焼入れ時に作用して強度を向上させる効果を有する。B含有量が0.0001%以下であることで、このような強度向上効果が十分に得られる。そのため、B含有量は、0.0001%以上であることが好ましい。B含有量は、より好ましくは0.0010%以上である。一方、B含有量が0.0100%以下であることで、介在物の形成が低減されて鋼板の脆化が抑制され、疲労強度の低下を抑制できる。そのため、B含有量は、0.0100%以下であることが好ましい。B含有量は、より好ましくは0.0040%以下である。
Nは、鋼中に含まれる不純物である。N含有量が0.010%以下であることで、鋼板に含まれるNによる窒化物の形成が抑制されて、鋼板の靭性低下を抑制できる。更に、鋼板中にBが含有される場合に、鋼板に含まれるNがBと結合して固溶B量を減少させることが抑制され、Bの焼入れ性向上効果の低下が抑制できる。そのため、N含有量は、0.010%以下であることが好ましく、N含有量はできる限り少なくすることがより好ましい。
Crは、鋼板の焼入れ性を向上させる元素である。かかる効果を十分に得るためには、Cr含有量を0.01%以上とすることが好ましい。一方、Cr含有量を1.00%以下とすることで、その効果を十分に得つつ、コストの上昇を抑制できる。そのため、含有させる場合のCr含有量は、1.00%以下とすることが好ましい。
[Co:0~2.00%]
Ni及びCoは、鋼の焼入れ性を高め、かつ、焼入れ後の鋼板部材の強度を安定して確保することを可能にする元素である。かかる効果を十分に発現させるためには、Ni含有量を0.10%以上とすることが好ましく、Co含有量を0.10%以上とすることが好ましい。一方、Ni含有量及びCo含有量がそれぞれ2.00%以下であることで、上記の効果を十分に得つつ、経済性が高められる。そのため、含有させる場合のNi含有量は、2.00%以下とすることが好ましく、Co含有量は2.00%以下とすることが好ましい。
Cuは、鋼の焼入れ性を高め、かつ、焼入れ後の鋼板部材の強度を安定して確保することを可能にする元素である。また、Cuは、腐食環境において耐孔食性を向上させる。かかる効果を十分に発現させるためには、Cu含有量を0.100%以上とすることが好ましい。一方、Cu含有量が1.000%以下であることで、上記の効果を十分に得つつ、経済性が高められる。そのため、含有させる場合のCu含有量は、1.000%以下とすることが好ましい。
Moは、鋼の焼入れ性を高め、かつ、焼入れ後の鋼板部材の強度を安定して確保することを可能にする元素である。かかる効果を十分に発現させるためには、Mo含有量を0.10%以上とすることが好ましい。一方、Mo含有量が1.00%以下であることで、上記の効果を十分に得つつ、経済性が高められる。そのため、含有させる場合のMo含有量は、1.00%以下とすることが好ましい。
Vは、鋼の焼入れ性を高め、かつ、焼入れ後の鋼板部材の強度を安定して確保することを可能にする元素である。かかる効果を十分に発現させるためには、V含有量を0.10%以上とすることが好ましい。一方、V含有量が1.00%以下であることで、上記の効果を十分に得つつ、経済性が高められる。そのため、含有させる場合のV含有量は、1.00%以下とすることが好ましい。
Nbは、鋼の焼入れ性を高め、かつ、焼入れ後の鋼板部材の強度を安定して確保することを可能にする元素である。かかる効果を十分に発現させるためには、Nb含有量を0.01%以上とすることが好ましい。一方、Nb含有量が1.00%以下であることで、上記の効果を十分に得つつ、経済性が高められる。そのため、含有させる場合のNb含有量は、1.00%以下とすることが好ましい。
Snは、腐食環境において耐孔食性を向上させる元素である。かかる効果を十分に発現させるためには、Sn含有量を0.01%以上とすることが好ましい。一方、Sn含有量が1.00%以下であることで、粒界強度の低下が抑制され、靭性の低下を抑制できる。そのため、含有させる場合のSn含有量は、1.00%以下とすることが好ましい。
Wは、鋼の焼入れ性を高め、かつ、焼入れ後の鋼板部材の強度を安定して確保することを可能にする元素である。また、Wは、腐食環境において耐孔食性を向上させる。かかる効果を十分に発現させるためには、W含有量を0.01%以上とすることが好ましい。一方、W含有量が1.00%以下であることで、上記の効果を十分に得つつ、経済性が高められる。そのため、含有させる場合のW含有量は、1.00%以下とすることが好ましい。
Caは、鋼中の介在物を微細化し、焼入れ後の靱性及び延性を向上させる効果を有する元素である。かかる効果を十分に発現させるためには、Ca含有量を0.001%以上とすることが好ましく、0.002%以上とすることがより好ましい。一方、Ca含有量が0.010%以下であることで、その効果を十分に得つつ、コストを抑制できる。そのため、含有させる場合のCa含有量は、0.010%以下とすることが好ましく、0.004%以下とすることがより好ましい。
REMは、Caと同様に鋼中の介在物を微細化し、焼入れ後の靱性及び延性を向上させる効果を有する元素である。かかる効果を十分に発現させるためには、REM含有量を0.001%以上とすることが好ましく、0.002%以上とすることがより好ましい。一方、REM含有量が0.30%以下であることで、その効果を十分に得つつ、コストを抑制できる。そのため、含有させる場合のREM含有量は、0.30%以下とすることが好ましく、0.20%以下とすることがより好ましい。
Oは必須元素ではなく、例えば鋼中に不純物として含有される。Oは、酸化物を形成し破壊の起点になるなど鋼板の特性劣化をもたらす元素である。また、鋼板の表面の近傍に存在する酸化物は、表面疵の原因となり、外観品位を劣化させる場合もある。このため、O含有量は低ければ低いほど良い。特に、O含有量を0.0070%以下とすることで、特性の劣化を抑制できるため、O含有量は0.0070%以下が好ましい。O含有量の下限は、特に限定するものではなく、0%としてもよいが、実操業上、精錬上のO含有量の実質的な下限は0.0005%である。
Sb含有量の下限は、特に限定するものではなく、0%としてもよい。Sbはめっきの濡れ性や密着性を向上させるのに有効な元素である。この効果を得るため、Sbは0.001%以上含有させることが好ましい。一方、Sb含有量を0.100%以下とすることで、製造時に発生する疵を抑制し、また靭性の低下を抑制できる。そのため、Sbの含有量は、0.100%以下であることが好ましい
自動車用の骨格部品では、一部の強度を高くし、その他の部分では、衝突時のエネルギーを吸収する目的で、強度を低くする場合がある。このように強度の異なる部分を有する部品は、上記のような、表面処理皮膜が表面の一部に付与された領域が形成されたホットスタンプ用鋼板を用いて製造できる。
以上のようにして得られるホットスタンプ部材は、鋼板の表面に、表面処理皮膜を有する部位と、表面処理皮膜を有していない部位と、を有している。かかる表面処理皮膜は、Zr酸化物、Zn酸化物、及び、Ti酸化物からなる群より選択される1種以上の酸化物を含有し、かつ、酸化物の付着量XOxideは、0.030g/m2以上である。また、かかる表面処理皮膜は、シリカの含有量が0~0.3g/m2である。ホットスタンプ部材の素材として用いられたホットスタンプ用鋼板の表面処理皮膜中に存在したカーボンブラックは、ホットスタンプの工程を経ることで消失し、上記金属酸化物が残存するようになる。ホットスタンプ部材の表面処理皮膜中に存在する酸化物の付着量XOxideは、素材として用いたホットスタンプ用鋼板の表面処理皮膜中の酸化物の付着量に依存するが、その上限値は、概ね0.600g/m2である。
各評価項目の評価方法は、以下の通りとした。
(評点)
日本産業規格 JIS Z 2244(2009)に記載された方法を用いて、表面処理皮膜を付与した部位の中心部P1と表面処理皮膜を付与していない部位の中心部P2におけるビッカース硬度を、鋼板断面から測定した(荷重F:50kgf)。P1とP2の硬度差により強度特性を評価し、硬度差がHv150以上の場合、異強度を有した優れた強度特性を有する部材とした。
3:ビッカース硬度の差ΔHVがHv200以上
2:ビッカース硬度の差ΔHVがHv150以上200未満
1:ビッカース硬度の差ΔHVがHv150未満
(評点)
日本産業規格JIS Z 8781-4(2013)に記載される方法でCIE 1976 L*a*b*色空間を5か所測定し、任意の2箇所を比較した場合のL*値の比率(RL*=L*値1/L*値2)を評価した。
2:0.5~2.0
1:0.5未満又は2.0超
試料に対し、リン酸化成処理、及び、厚み15μmの電着塗装を施し、170℃で20分間焼き付けて塗膜を付与した。その後、60℃の脱イオン水に200時間浸漬後にカッターで1mm間隔の碁盤目を100個切り、碁盤目部の剥離した部分の個数を目視で測定することで、剥離した部分の面積率を算出した。算出した面積率に基づいて、評点付けを行った。
(評点)
3:剥離面積0%以上10%未満
2:剥離面積10%以上70%未満
1:剥離面積70%以上100%以下
(3)と同様に付与した塗膜にカッターで疵を入れ、自動車技術会制定のJASO M609に規定する方法で行った。腐食試験180サイクル後のカット疵からの塗膜膨れの幅(片側最大値)を計測した。
(評点)
3:膨れ幅0mm以上1.5mm未満
2:膨れ幅1.5mm以上3mm未満
1:膨れ幅3mm以上
以下に示す表2において、A1~21が実施例であり、a1~a3が比較例である。
本実施例1では、水系処理液を調整する際に、バインダー成分以外の化合物として、カーボンブラック、窒化チタン、炭化チタン、酸化チタン、酸化鉄、酸化銅、酸化ジルコニウム、窒化ケイ素、酸化コバルト、酸化スズの少なくとも何れかを用いた。水系処理液における、バインダー成分以外の化合物の合計含有量は、固形分全体の体積に対して、2~50体積%の範囲内となるようにした。水系処理液の固形分濃度を10~40質量%とし、鋼板上に3μm~25μmの液膜厚みとなるように塗布した後、乾燥させることで皮膜を得た。乾燥時の雰囲気は、大気又は窒素雰囲気とし、温度は100~300℃とした。水系処理液における化合物の合計含有量が、乾燥後に得られる表面処理皮膜における化合物の合計含有量となる。本実施例では、化合物の含有量、及び、表面処理皮膜の付着量を調整することで、波長8.0μmでの放射率の値を調整した。
表3において、発明例B1では、カーボンブラック(CB)を表面処理皮膜中で2.7体積%とし、TiO2を表面処理皮膜中で0.6体積%とした。その結果、有皮膜部位における25℃、波長8.0μmでの放射率は86%となり、ホットスタンプ部材の有皮膜部位と無皮膜部位の硬度差は、ビッカース硬度HV150以上200未満(評点2)となった。塗料密着性は、評点3であったものの、外観は、評点1であった。また、カーボンブラックを表面処理皮膜中で4.0体積%とし、TiO2を表面処理皮膜中で1.0体積%とした発明例B2では、有皮膜部位における25℃、波長8.0μmでの放射率は80%となり、ホットスタンプ部材の有皮膜部位と無皮膜部位の硬度差がビッカース硬度HV150以上200未満(評点2)となった。カーボンブラックを表面処理皮膜中で58.3体積%とし、ZnOを表面処理皮膜中で1.2体積%とした発明例B5と、カーボンブラックを表面処理皮膜中で47.3体積%とし、ZnOを表面処理皮膜中で1.0体積%とした発明例B6では、有皮膜部位における25℃、波長8.0μmでの放射率はそれぞれ88%、90%となり、外観は、評点2であった。また、塗料密着性は、評点2であった。
表4において、表面処理皮膜中のZn酸化物の含有量を0.2体積%とした発明例C1、表面処理皮膜中のTi酸化物の含有量を0.3体積%とした発明例C2、及び、表面処理皮膜中のTi酸化物の含有量を37.5体積%とした発明例C6に比べて、発明例C3~C5のように、表面処理皮膜中のTi酸化物,Zr酸化物の含有量を1.0~30.0体積%とすることで、ホットスタンプ部材の有皮膜部位と無皮膜部位の硬度差が更に大きくなった(評点3)。硬度差が大きくなったのは、酸化物の輻射率が鋼板表面の化合物に比べて大きいこと、及び、鋼板表面と酸化物粒子との界面の存在により赤外線の反射が妨げられることで試料への入熱量が大きくなるために、無皮膜部位との加熱速度差が大きくなったこと、が要因と考えられる。
表5において、発明例D1では、有皮膜部位における700℃、波長8.0μmでの放射率は56%であり、ホットスタンプ部材の有皮膜部位と無皮膜部位の硬度差は、ビッカース硬度HV150以上200未満(評点2)となった。一方、有皮膜部位における700℃、波長8.0μmでの放射率が60%以上である発明例D2~D6では、ホットスタンプ部材の有皮膜部位と無皮膜部位の硬度差がビッカース硬度HV200以上(評点3)となった。
表6において、発明例E1~E5とE6を比較すると明らかなように、めっきの無い発明例E6では塗装後耐食性が「1」であったのに対して、Al-10質量%Si、又は、Zn-3質量%Niのめっきを有する発明例E1~E5では塗装後耐食性が「2」又は「3」に向上した。
Claims (9)
- 25℃における波長8.0μmでの放射率が60%以上である表面処理皮膜を有する部位と、前記表面処理皮膜を有していない部位と、を鋼板の表面に有し、
前記表面処理皮膜は、カーボンブラックと、Zr酸化物、Zn酸化物、及び、Ti酸化物からなる群より選択される1種以上の酸化物と、を含有し、かつ、前記カーボンブラック及び前記酸化物は、前記表面処理皮膜の全体に分散して存在し、
前記表面処理皮膜は、シリカの含有量が0~0.3g/m2であり、
前記カーボンブラック及び前記酸化物の付着量を各々XCB(g/m2)、XOxide(g/m2)とするとき、下記式(1)を満足する、ホットスタンプ用鋼板。
118.9≦24280/{6700/(100+76×XCB)+18000/(130+65×XOxide)}≦332.0 ・・・ 式(1)
- 前記表面処理皮膜は、前記カーボンブラックを5.0~40.0体積%含有し、前記酸化物を1.0~30.0体積%含有する、請求項1に記載のホットスタンプ用鋼板。
- 前記カーボンブラックの付着量XCB(g/m2)と前記酸化物の付着量XOxide(g/m2)との比率XOxide/XCBは、0.20以上200.00以下である、請求項1又は2に記載のホットスタンプ用鋼板。
- 前記カーボンブラックの付着量XCBは、0.030g/m2以上であり、前記酸化物の付着量XOxideは、0.030g/m2以上である、請求項1~3の何れか1項に記載のホットスタンプ用鋼板。
- 前記表面処理皮膜の700℃における波長8.0μmでの放射率は、60%以上である、請求項1~4の何れか1項に記載のホットスタンプ用鋼板。
- 前記ホットスタンプ用鋼板の片面又は両面において、前記鋼板の基材と前記表面処理皮膜との間に、金属めっき層を有する、請求項1~5の何れか1項に記載のホットスタンプ用鋼板。
- 鋼板の表面に、表面処理皮膜を有する部位と、前記表面処理皮膜を有していない部位と、を有し、
前記表面処理皮膜は、Zr酸化物、Zn酸化物、及び、Ti酸化物からなる群より選択される1種以上の酸化物を含有し、かつ、前記酸化物の付着量XOxideは、0.030g/m2以上であり、
前記表面処理皮膜は、シリカの含有量が0~0.3g/m2である、ホットスタンプ部材。 - JIS Z 2244(2009)で規定されるビッカース硬度を測定したときに、最大硬度HVmaxを示す部位と、最小硬度HVminを示す部位と、が存在し、かつ、前記最大硬度HVmaxと前記最小硬度HVminとの硬度差ΔHVが、150以上である、請求項7に記載のホットスタンプ部材。
- 前記最大硬度HVmaxを示す部位と、前記最小硬度HVminを示す部位の双方は、共通の素材で構成された領域内に存在する、請求項8に記載のホットスタンプ部材。
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CN202180096658.5A CN117222774A (zh) | 2021-04-08 | 2021-04-08 | 热冲压用钢板和热冲压构件 |
KR1020237034077A KR20230154955A (ko) | 2021-04-08 | 2021-04-08 | 핫 스탬프용 강판 및 핫 스탬프 부재 |
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