WO2017017905A1 - Procédé pour la production d'élément formé à la presse à chaud - Google Patents

Procédé pour la production d'élément formé à la presse à chaud Download PDF

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Publication number
WO2017017905A1
WO2017017905A1 PCT/JP2016/003196 JP2016003196W WO2017017905A1 WO 2017017905 A1 WO2017017905 A1 WO 2017017905A1 JP 2016003196 W JP2016003196 W JP 2016003196W WO 2017017905 A1 WO2017017905 A1 WO 2017017905A1
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Prior art keywords
steel sheet
hot
zinc
heating
pressed member
Prior art date
Application number
PCT/JP2016/003196
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English (en)
Japanese (ja)
Inventor
中島　清次
安藤　聡
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to MX2018001125A priority Critical patent/MX2018001125A/es
Priority to US15/747,880 priority patent/US20180216219A1/en
Priority to CN201680044284.1A priority patent/CN107921509A/zh
Priority to EP16830013.5A priority patent/EP3330016B1/fr
Priority to KR1020187002274A priority patent/KR102050175B1/ko
Priority to JP2016562278A priority patent/JP6409878B2/ja
Publication of WO2017017905A1 publication Critical patent/WO2017017905A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc

Definitions

  • the present invention relates to a method for manufacturing a hot press member suitable for application to an undercarriage member or a vehicle body structural member of an automobile.
  • Patent Document 1 discloses a hot press that enables both easy processing and high strength by simultaneously processing a heated steel sheet using a die and a punch and simultaneously quenching.
  • this hot press the steel plate is heated to a high temperature of around 950 ° C. before hot pressing, so scale (iron oxide) is generated on the surface of the steel plate and the scale peels off during hot pressing.
  • the mold is damaged or the surface of the member after hot pressing is damaged.
  • the scale remaining on the surface of the member also causes poor appearance and poor paint adhesion. For this reason, the scale on the surface of the member is usually removed by processing such as pickling or shot blasting. However, this complicates the manufacturing process and reduces productivity.
  • Patent Document 2 discloses a hot pressed member excellent in corrosion resistance in which a steel sheet coated with Zn or a Zn base alloy is hot pressed and a Zn—Fe base compound or a Zn—Fe—Al base compound is provided on the surface. A manufacturing method is disclosed.
  • Patent Document 3 describes a hot pressed member excellent in scale resistance, coating adhesion, post-coating corrosion resistance, and hydrogen penetration resistance, corresponding to the Ni diffusion region on the surface layer of the steel sheet and the ⁇ phase of Zn—Ni alloy.
  • a hot press member having an intermetallic compound layer and a ZnO layer is disclosed.
  • Patent Document 4 discloses a steel sheet for hot pressing in which a ZnO layer that suppresses evaporation of zinc is formed in advance on the surface layer of a zinc-based plating layer. By using this steel sheet, the appearance of a pressed product is disclosed. It has been shown that a hot press-molded article having good coating film adhesion and excellent corrosion resistance after coating can be obtained.
  • the use of a galvanized steel sheet as a steel sheet for hot pressing is effective in improving corrosion resistance.
  • the melting point of zinc is 419 ° C. and the boiling point is 907 ° C., both of them are low, so in the heating process before hot pressing, the zinc in the plating layer melts and the zinc evaporates from the plating layer. It has been difficult to stably produce a hot press member having a surface appearance.
  • a hot-pressed member manufactured by the method described in Patent Document 2 uses a galvanized steel sheet or a galvanized aluminum-plated steel sheet having a low melting point. Therefore, in the heating step before hot pressing, the plating layer is melted or zinc is evaporated. Occurs violently. As a result, a hot press member having a uniform and good surface appearance, such as a hot-pressed member finally obtained having a patchy non-uniform appearance or many white or black spot-like defects, is obtained. Was difficult.
  • the spot-like defect part not only the surface appearance problem but also the paint adhesion is poor, so a technique for preventing the spot-like defect has been eagerly desired, but no effective countermeasure has been proposed so far. It was.
  • the hot press member described in Patent Document 3 is manufactured using a steel plate having a Zn—Ni alloy plating layer having a melting point higher than that of zinc, the hot press member is hotter than when using a galvanized steel plate or a galvanized aluminum plated steel plate. Although the surface appearance of the pressed member is improved, it has not been able to completely prevent the occurrence of local point defects.
  • the surface appearance of the hot pressing member was improved to some extent by the action of the ZnO layer formed on the surface layer.
  • the ZnO layer forming process needs to be performed by a method such as an oxidation process by heat, a contact process with a solution, an electrolytic process in an aqueous solution, and a coating and drying process of a solution, resulting in a significant increase in cost. there were.
  • the present invention has been made for the purpose of solving the problems of the prior art as described above, and can stably produce a hot press member having a uniform and good surface appearance without incurring a significant cost increase. It aims at providing the manufacturing method of the hot press member excellent in the surface external appearance which enables manufacture.
  • the present inventors diligently studied a method for manufacturing a hot press member having an excellent surface appearance.
  • a hot-pressed steel sheet having a Zn—Ni alloy plating layer with a higher melting point than a zinc-based steel sheet with a relatively low melting point such as a hot-dip galvanized steel sheet or an alloyed hot-dip galvanized steel sheet, is used. However, it was found that the point defects cannot be completely prevented even in the case of a Zn—Ni alloy-plated steel sheet.
  • the manufacturing method of the hot press member of the present invention has been made based on such knowledge, and the gist thereof is as follows.
  • [1] A method for manufacturing a hot pressed member in which a zinc-based plated steel sheet is heated to a temperature range of Ac3 transformation point to 1000 ° C., and then hot-pressed and cooled.
  • [2] A method for producing a hot pressed member in which a zinc-based plated steel sheet is cold-pressed and then heated to a temperature range of Ac3 transformation point to 1000 ° C. and cooled.
  • the galvanized steel sheet contains 10 to 25% by mass of Ni, the balance is made of Zn and unavoidable impurities, and a coating layer having an adhesion amount per side of 10 to 90 g / m 2 is provided on one side or both sides.
  • the manufacturing method of the hot press member as described in [1] or [2] which is a Zn-Ni alloy plating steel plate which has.
  • % which shows the component of steel, and% which shows the component of plating are all the mass%.
  • the hot press member manufactured according to the present invention is suitable for an automobile suspension member and a vehicle body structural member.
  • FIG. 1 is a view showing a typical appearance of a hot-pressed member, and is an appearance photograph of (a) a good appearance product and (b) a point defect generation product, respectively.
  • FIG. 2 is a view showing a typical appearance of a point defect, and is an enlarged photograph of (a) a white defect and (b) a black defect, respectively.
  • Zinc-based plated steel sheet The method for producing a hot-pressed member of the present invention uses a zinc-based plated steel sheet having a zinc-based plated layer on one or both surfaces of the steel sheet surface.
  • Examples of zinc-based plating include hot dip galvanizing, alloyed hot dip galvanizing, hot dip zinc-aluminum alloy plating, hot dip zinc-aluminum-magnesium alloy plating, electrogalvanizing, and electrogalvanizing-nickel alloy plating.
  • the known zinc-based plating containing zinc is applicable.
  • the coating amount on the surface of these galvanized steel sheets is preferably 10 to 90 g / m 2 per side. If the amount of adhesion per side (hereinafter sometimes simply referred to as the amount of adhesion) is 10 g / m 2 or more, the corrosion resistance will not be insufficient. On the other hand, if the adhesion amount is 90 g / m 2 or less, the cost is not increased. A more preferable adhesion amount is 20 to 80 g / m 2 . The adhesion amount can be obtained by a wet analysis method.
  • the entire plating layer of a test piece with a known adhesion area is dissolved in an aqueous solution obtained by adding 1 g / L of hexamethylenetetramine as an inhibitor to a 6% by mass hydrochloric acid aqueous solution. What is necessary is just to obtain
  • a Zn-Ni alloy-plated steel sheet having a plating layer containing 10 to 25% by mass of Ni and the balance of Zn and inevitable impurities on one side or both sides is preferable.
  • the Ni content in the plating layer is 10 to 25% by mass
  • the phase structure of the plating layer becomes a ⁇ phase, and since this ⁇ phase has a high melting point of 881 ° C., the effect of suppressing the occurrence of point defects becomes more prominent.
  • the ⁇ phase has a crystal structure of Ni 2 Zn 11 , NiZn 3 , or Ni 5 Zn 21 and can be confirmed by an X-ray diffraction method.
  • a base plating layer such as a plating layer mainly composed of Ni may be provided below the plating layer.
  • a base plating layer such as a plating layer mainly composed of Ni may be provided below the plating layer.
  • a base plating layer such as a plating layer mainly composed of Ni may be provided below the plating layer.
  • the underlying steel plate of the zinc-based plating layer for example, C: 0.15-0.50%, Si: 0.05-2. 00%, Mn: 0.5 to 3.0%, P: 0.10% or less, S: 0.05% or less, Al: 0.10% or less, N: 0.010% or less, the balance Can be used a hot-rolled steel sheet or a cold-rolled steel sheet having a composition composed of Fe and inevitable impurities.
  • a hot-rolled steel sheet or a cold-rolled steel sheet having such a component composition is used as the base steel sheet, a hot-pressed member that can obtain the required high strength such as having a strength of 980 MPa or more can be obtained.
  • the reason for limitation of each component composition is demonstrated below.
  • C 0.15-0.50% C is an element that improves the strength of steel.
  • the amount In order to increase the tensile strength of the hot-pressed member (hereinafter sometimes referred to as TS) to 980 MPa or more, the amount needs to be 0.15% or more. is there.
  • the C content is preferably 0.15 to 0.50%.
  • Si 0.05-2.00% Si, like C, is an element that improves the strength of steel.
  • the amount needs to be 0.05% or more.
  • the Si content exceeds 2.00%, the plating processability may be adversely affected when a plating process for forming a plating film mainly composed of Zn or Al on the steel sheet surface is performed. Accordingly, the Si content is preferably 0.05 to 2.00%.
  • Mn 0.5 to 3.0%
  • Mn is an element effective for suppressing the ferrite transformation and improving the hardenability, and also reduces the Ac 3 transformation point, so that it is an effective element for lowering the heating temperature before hot pressing. is there. In order to exhibit such an effect, the amount needs to be 0.5% or more.
  • the amount of Mn exceeds 3.0%, it segregates and the uniformity of the characteristics of the raw steel plate and hot pressed member is lowered. Therefore, the amount of Mn is preferably 0.5 to 3.0%.
  • the P content is preferably 0.10% or less.
  • the amount of S is preferably 0.05% or less.
  • the Al content is preferably 0.10% or less.
  • N 0.010% or less
  • nitride of AlN is formed during hot rolling or heating before hot pressing, and blanking workability and hardenability of the raw steel sheet. Reduce. Accordingly, the N content is preferably 0.010% or less.
  • the balance is Fe and inevitable impurities. Further, in addition to the above component composition, it was selected from Cr: 0.01 to 1.0%, Ti: 0.01 to 0.20%, and B: 0.0005 to 0.0800% for the following reasons. It is preferable that at least one kind or Sb: 0.003 to 0.030% is contained individually or simultaneously.
  • Cr 0.01 to 1.0% Cr is an element effective for strengthening steel and improving hardenability. In order to exhibit such an effect, the Cr content is preferably 0.01% or more. On the other hand, if the Cr content exceeds 1.0%, the cost is significantly increased, so the upper limit is preferably set to 1.0%.
  • Ti 0.01-0.20%
  • Ti is an element effective for strengthening steel and improving toughness by refining. Further, it is also an element effective for forming a nitride in preference to B described below and exhibiting the effect of improving hardenability by solid solution B. Therefore, the Ti amount is preferably 0.01% or more. However, if the amount of Ti exceeds 0.20%, the rolling load during hot rolling increases extremely, and the toughness of the hot pressed member decreases, so the upper limit may be 0.20%. preferable.
  • B 0.0005 to 0.0800%
  • B is an element effective for improving the hardenability during hot pressing and toughness after hot pressing.
  • the B content is preferably 0.0005% or more.
  • the upper limit is preferably 0.0800%.
  • Sb 0.003 to 0.030%
  • Sb has an effect of suppressing a decarburized layer generated in the surface layer portion of the steel sheet between the time when the galvanized steel sheet is heated and before hot pressing and cooling. In order to exhibit such an effect, the amount needs to be 0.003% or more. On the other hand, if the amount of Sb exceeds 0.030%, the rolling load increases and the productivity is lowered. Therefore, the Sb content is preferably 0.003 to 0.030%.
  • a hot press member is manufactured by using the process of either of the following two aspects as a hot press process.
  • the first aspect is a method of manufacturing a hot press member in which a zinc-based plated steel sheet is heated to a temperature range of Ac 3 to 1000 ° C., and then hot pressed and cooled.
  • a hot press process called a direct process
  • the heating temperature is less than the Ac3 transformation point, the steel sheet is not sufficiently quenched, and the desired strength may not be obtained.
  • the heating temperature exceeds 1000 ° C., not only is it uneconomical in energy, but also the occurrence of point defects becomes significant, making it difficult to produce a hot pressed member having a uniform and good surface appearance.
  • the cooling after hot pressing may be performed using a mold simultaneously with the hot pressing, or may be performed using a coolant such as water at the same time as or immediately after the hot pressing.
  • the second aspect is a method for producing a hot pressed member in which a zinc-based plated steel sheet is cold-pressed and then heated to a temperature range of Ac3 transformation point to 1000 ° C. and then cooled, which is called an indirect process.
  • This is a hot pressing process.
  • cold pressing is first performed before heating the galvanized steel sheet.
  • the cold-pressed member is heated and then cooled.
  • the heating temperature is in the temperature range of Ac3 transformation point to 1000 ° C. for the same reason as described above. Cooling may be performed using a mold for cooling the member, or may be performed using a coolant such as water. Moreover, you may perform the additional process by a hot press, when cooling using a metal mold
  • the heating temperature here means the highest temperature reached of the steel sheet.
  • Examples of the heating method include heating by an electric furnace or a gas furnace, flame heating, energization heating, high frequency heating, induction heating, and the like.
  • 4) Surface cleaning treatment In the method for producing a hot-pressed member of the present invention, zinc is coated for the purpose of removing dirt, dust, fingerprints and the like adhering to the surface of the plating layer before heating the zinc-based plated steel sheet.
  • the surface-cleaning treatment of the galvanized steel sheet is performed. This surface cleaning treatment is an important requirement in the present invention. When this surface cleaning treatment is not performed, point defects are generated as shown in FIG. However, when the surface cleaning treatment is performed, a product having a good appearance can be produced as shown in FIG.
  • the point defects include white defects which are traces of destruction of the ZnO layer covering the surface of the zinc-based plating layer and intense zinc evaporation, or FIG. 2 (b).
  • the surface cleaning process is a process for removing a point-like defect.
  • the steel sheet coil It is necessary to carry out the surface cleaning treatment in the state of the above, or in the state of the steel plate sheet or steel plate blank cut out from the steel plate coil.
  • the second aspect after the zinc-plated steel sheet is cold-pressed and heated to a temperature range of Ac3 transformation point to 1000 ° C.
  • the state of the steel sheet coil, the steel sheet sheet cut from the steel sheet coil or the steel sheet blank The surface cleaning process can be performed in the state of the above, or the surface cleaning process can be performed in the state of the member after the cold pressing.
  • the method of the surface cleaning treatment is not limited as long as it is a method capable of removing dirt, dust, fingerprints and the like adhering to the surface of the plating layer.
  • a method of wiping the steel sheet surface with a cloth cloth a method of brushing the steel sheet surface using a brush such as nylon, a method of brushing the surface after applying a liquid that does not harm the steel sheet such as cleaning oil to the steel sheet surface, Examples include alkali degreasing and solvent degreasing. Cleaning methods such as cleaning oil brushing and brushing, alkali degreasing, solvent degreasing, etc., bringing the liquid into contact with the steel plate surface is more effective than physical methods such as wiping or brushing with cloth cloth.
  • a method of bringing a liquid into contact with the steel plate surface is preferable from the viewpoint of completely cleaning the steel plate surface.
  • alkaline degreasing is performed as a surface cleaning treatment
  • the pH of the alkaline degreasing solution is 12.5 or more
  • the action of dissolving the zinc-based plating layer itself is too strong.
  • the generation is promoted, and the amount of plating is reduced to deteriorate the corrosion resistance. Therefore, when alkali degreasing is performed as the surface cleaning treatment, the pH of the alkaline degreasing solution is less than 12.5.
  • the cost required for the surface cleaning process is preferably low. If you have a combination of cleaning oil coating and brushing as equipment for cold pressing, this equipment can be used for hot pressing and can be processed at low cost and with a high cleaning effect. Therefore, it is preferable.
  • hot dip Zn plating On the surface of this cold-rolled steel sheet, hot dip Zn plating, hot dip Zn—Al alloy plating (Al content: 55% by mass), alloyed hot dip Zn plating (Fe content: 10% by weight), electric Zn plating, electric Zn— One of Ni alloy plating (Ni content: 12% by mass) was applied and sheared to a size of 200 mm ⁇ 300 mm to obtain a test material.
  • the surface specimen was subjected to surface cleaning treatment.
  • As the surface cleaning treatment one of A: cloth wiping, B: brushing, C: combined use of cleaning oil coating and brushing, D: alkaline degreasing (pH is 12.0), E: solvent degreasing was performed. .
  • F a test material that had been subjected to strong alkali degreasing (pH was 13.0) and a test material that was not subjected to surface cleaning treatment were also prepared.
  • Cloth wiping was performed by manually wiping the surface of the test material twice with a cloth waste (cleaning white knitted cloth (cotton), manufactured by Nippon Wes Co., Ltd.).
  • the brushing was performed by manually wiping the surface of the specimen twice twice using a nylon fiber-implanted brush (SK linear brush, Showa Kogyo Co., Ltd.).
  • cleaning oil coating and brushing is performed by applying a cleaning rust preventive oil (Preton R352L, manufactured by Sugimura Chemical Co., Ltd.) to the surface of the test material so that the amount of coating is 2.0 g / m 2 . Brushing was performed as described above.
  • a cleaning rust preventive oil Preton R352L, manufactured by Sugimura Chemical Co., Ltd.
  • Alkaline degreasing was performed by spraying an alkali degreasing solution (CL-N364S, 20 g / L, 60 ° C., manufactured by Nihon Parkerizing Co., Ltd.) for 10 seconds on the test material, and then washing and drying.
  • the pH of the alkaline degreasing solution at this time was 12.0.
  • Solvent degreasing was performed by immersing the test material in a 1: 1 mixed solvent of toluene and ethanol, performing ultrasonic cleaning for 1 minute, and then drying.
  • the strong alkaline degreasing performed as a comparative example was performed by immersing the test material in a strong alkaline degreasing solution (NaOH aqueous solution, pH adjusted to 13.0, 50 ° C.) for 5 seconds, followed by washing with water and drying.
  • a strong alkaline degreasing solution NaOH aqueous solution, pH adjusted to 13.0, 50 ° C.
  • test material zinc-based plated steel sheet obtained as described above.
  • the zinc-based plated steel sheets (invention examples) manufactured by performing the surface cleaning treatment by the manufacturing method of the present invention are excellent in surface appearance.
  • the surface appearance is most excellent when an electric Zn—Ni alloy plated steel sheet is used.
  • the zinc-based plated steel sheet (comparative example) that has been subjected to strong alkaline degreasing with a pH of 12.5 or higher and the zinc-based plated steel sheet (comparative example) that has not been subjected to surface cleaning treatment are both poor in surface appearance. ing.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electrochemistry (AREA)
  • Coating With Molten Metal (AREA)
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  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Chemically Coating (AREA)

Abstract

L'invention concerne un procédé pour la production d'un élément formé à la presse à chaud ayant un excellent aspect de surface, qui permet une production stable d'un élément formé à la presse à chaud qui a un aspect de surface bon et uniforme sans générer une augmentation importante du coût. Selon l'invention, dans un procédé pour la production d'un élément formé à la presse à chaud dans lequel un formage à la presse à chaud et un refroidissement sont effectués après le chauffage d'une tôle d'acier galvanisé sur une plage de température allant du point de transformation Ac3 à 1 000 °C, la tôle d'acier galvanisé est soumise à un traitement de purification de surface avant le chauffage. Selon l'invention également, dans un procédé pour la production d'un élément formé à la presse à chaud dans lequel une tôle d'acier galvanisé est chauffée sur une plage de température allant du point de transformation Ac3 à 1 000 °C et refroidie après formage à la presse à froid de la tôle d'acier galvanisé, la tôle d'acier galvanisé est soumise à un traitement de purification de surface avant le chauffage. La tôle d'acier galvanisé est de préférence une tôle d'acier plaquée d'alliage de Zn-Ni qui contient 10 à 25 % en masse de Ni, le reste étant constitué de Zn et d'impuretés inévitables, tout en ayant une couche de placage sur une surface ou les deux surfaces, la quantité ayant été amenée à adhérer par surface étant de 10 à 90 g/m2.
PCT/JP2016/003196 2015-07-29 2016-07-05 Procédé pour la production d'élément formé à la presse à chaud WO2017017905A1 (fr)

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MX2018001125A MX2018001125A (es) 2015-07-29 2016-07-05 Metodo para fabricar un miembro prensado en caliente.
US15/747,880 US20180216219A1 (en) 2015-07-29 2016-07-05 Method for Manufacturing Hot-Pressed Member
CN201680044284.1A CN107921509A (zh) 2015-07-29 2016-07-05 热冲压部件的制造方法
EP16830013.5A EP3330016B1 (fr) 2015-07-29 2016-07-05 Procédé pour la production d'élément formé à la presse à chaud
KR1020187002274A KR102050175B1 (ko) 2015-07-29 2016-07-05 열간 프레스 부재의 제조 방법
JP2016562278A JP6409878B2 (ja) 2015-07-29 2016-07-05 熱間プレス部材の製造方法

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CN114525389A (zh) * 2022-02-16 2022-05-24 南京钢铁股份有限公司 一种镍系钢板表面质量的控制方法

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US20180216219A1 (en) 2018-08-02
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MX2018001125A (es) 2018-05-23
EP3330016B1 (fr) 2023-09-06
CN107921509A (zh) 2018-04-17
KR102050175B1 (ko) 2019-11-28
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JP6409878B2 (ja) 2018-10-24
JPWO2017017905A1 (ja) 2017-07-27

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