WO2013132816A1 - 熱間プレス用鋼板、その製造方法、およびそれを用いた熱間プレス部材の製造方法 - Google Patents
熱間プレス用鋼板、その製造方法、およびそれを用いた熱間プレス部材の製造方法 Download PDFInfo
- Publication number
- WO2013132816A1 WO2013132816A1 PCT/JP2013/001294 JP2013001294W WO2013132816A1 WO 2013132816 A1 WO2013132816 A1 WO 2013132816A1 JP 2013001294 W JP2013001294 W JP 2013001294W WO 2013132816 A1 WO2013132816 A1 WO 2013132816A1
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- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- plating layer
- hot
- hot pressing
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- Prior art date
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 104
- 239000010959 steel Substances 0.000 title claims abstract description 104
- 238000007731 hot pressing Methods 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title abstract description 20
- 238000007747 plating Methods 0.000 claims abstract description 96
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 230000009466 transformation Effects 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 46
- 230000007797 corrosion Effects 0.000 abstract description 45
- 239000011248 coating agent Substances 0.000 abstract description 6
- 238000000576 coating method Methods 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 74
- 239000003973 paint Substances 0.000 description 16
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 12
- 238000005755 formation reaction Methods 0.000 description 12
- 230000007423 decrease Effects 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 229910007567 Zn-Ni Inorganic materials 0.000 description 5
- 229910007614 Zn—Ni Inorganic materials 0.000 description 5
- 239000010960 cold rolled steel Substances 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 238000004070 electrodeposition Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910003962 NiZn Inorganic materials 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000004627 transmission electron microscopy Methods 0.000 description 2
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 241000219307 Atriplex rosea Species 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910019589 Cr—Fe Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910009369 Zn Mg Inorganic materials 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 229910007573 Zn-Mg Inorganic materials 0.000 description 1
- 229910007564 Zn—Co Inorganic materials 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002003 electron diffraction Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- 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
- B21D22/02—Stamping using rigid devices or tools
- B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
-
- 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
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
-
- 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
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
-
- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
-
- C—CHEMISTRY; METALLURGY
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
-
- 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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- 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
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
-
- 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
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- C—CHEMISTRY; METALLURGY
- 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
-
- 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
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12785—Group IIB metal-base component
- Y10T428/12792—Zn-base component
- Y10T428/12799—Next to Fe-base component [e.g., galvanized]
Definitions
- Patent Document 1 describes a process called a hot press that enables both easy processing and high strength by simultaneously processing a heated steel sheet using a die and punch die and simultaneously cooling it.
- Technology has been proposed.
- 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.
- the scale on the surface of the member is usually removed by processing such as pickling or shot blasting, but this complicates the manufacturing process and causes a decrease in productivity.
- excellent corrosion resistance is required for automobile undercarriage members and vehicle body structural members, hot press members manufactured by the above-described processes are not provided with a rust preventive film such as a plating layer. Therefore, the corrosion resistance is very insufficient.
- Patent Document 2 discloses a hot-pressed member excellent in corrosion resistance, in which a steel sheet coated with Zn or a Zn-based alloy is hot-pressed and a Zn-Fe-based compound or a Zn-Fe-Al-based compound is provided on the surface.
- a manufacturing method is disclosed.
- Patent Document 3 describes a process in which an alloyed hot-dip Zn-plated steel sheet is heated at 700 to 1000 ° C. for 2 to 20 minutes and then hot pressed to provide a plating layer containing a Fe—Zn solid solution phase on the surface.
- a hot press-formed product (member) having excellent properties, weldability, and corrosion resistance is disclosed.
- the present invention has been made based on such knowledge, and has a Zn-based plating layer having an adhesion amount of 10 to 90 g / m 2 on a steel plate having an average ferrite particle size of 20 ⁇ m or less on the steel plate surface.
- a steel sheet for hot pressing is provided.
- the Zn-based plating layer is preferably a plating layer containing 10 to 25% by mass of Ni and the balance of Zn and inevitable impurities.
- the amount of ⁇ phase contained in the Zn-based plating layer is preferably 5% by mass or less, more preferably 2% by mass or less.
- the base steel sheet is individually at least one selected from Cr: 0.01 to 1%, Ti: 0.2% or less, B: 0.0005 to 0.08%, and Sb: 0.003 to 0.03% by mass. Or it is preferable to contain simultaneously.
- the steel sheet for hot pressing of the present invention can be produced by forming a Zn-based plating layer having an adhesion amount of 10 to 90 g / m 2 after heat treatment at 760 to 840 ° C. with a steel sheet having the above component composition.
- the present invention also provides a method for producing a hot press member, characterized in that the hot press steel sheet as described above is hot pressed after being heated to a temperature range of Ac 3 transformation point to 1000 ° C. .
- the hot press member manufactured by the hot press member manufacturing method of the present invention using the hot press steel plate of the present invention has a good appearance and is suitable for an automobile undercarriage member and a vehicle body structural member. is there.
- a pure Zn plating layer for example, a plating layer formed by an electric Zn plating line or a molten Zn plating line), a Zn-Ni alloy plating layer, a Zn-Fe alloy plating layer (hot Zn) Plating layer alloyed in plating line), Zn-Cr alloy plating layer, Zn-Mn alloy plating layer, Zn-Co alloy plating layer, Zn-Cr-Ni alloy plating layer, Zn-Cr-Fe alloy Plating layer, Zn-Cr-Co alloy plating layer, Zn-Al alloy plating layer (for example, Zn-5% Al plating layer or Zn-55% Al plating layer), Zn-Mg alloy plating layer, Zn-Al-Mg An alloy plating layer (for example, a Zn-6% Al-3% Mg plating layer or a Zn-11% Al-3% Mg plating layer) can be used.
- a Zn—Ni alloy plating layer having a Ni content of 10 to 25% by mass is preferable. This is because, in this Zn-Ni alloy system, a ⁇ phase with a melting point of 881 ° C with a crystal structure of Ni 2 Zn 11 , NiZn 3 or Ni 5 Zn 21 is formed. This is because the scale and ZnO formation reaction can be minimized. Further, since the melting point is high, the diffusion rate of the plating component into the ferrite grains is suppressed during hot pressing, and the decrease in the plating layer is reduced, so that the corrosion resistance is less deteriorated. Further, since no Zn—Fe metal compound is formed during heating, the generation of scale associated with the occurrence of cracks is also suppressed.
- the plating layer remains as a ⁇ phase even after the hot pressing is completed, excellent corrosion resistance is exhibited by the sacrificial anticorrosive effect of Zn.
- the formation of the ⁇ phase when the Ni content is 10 to 25% by mass does not necessarily match the equilibrium diagram of the Ni—Zn alloy. This is presumably because the formation reaction of the plating layer performed by electroplating or the like proceeds in a non-equilibrium manner.
- the ⁇ phase of Ni 2 Zn 11 , NiZn 3 and Ni 5 Zn 21 can be confirmed by an X-ray diffraction method or an electron diffraction method using TEM (Transmission Electron Microscopy).
- the method for forming such a plating layer is not particularly limited.
- a known electrolysis method electrolysis in an aqueous solution or non-aqueous solution
- a melting method melting method
- a gas phase method gas phase method
- Si 0.05-2.0% 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 2.0%, the occurrence of surface defects called red scale during hot rolling is remarkably increased, the rolling load is increased, and the ductility of the hot-rolled steel sheet is deteriorated.
- the Si content exceeds 2.0%, 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. Therefore, the Si content is 0.05 to 2.0%.
- P 0.1% or less
- Al 0.1% or less When the Al content exceeds 0.1%, blanking workability and hardenability of the steel sheet as raw material are lowered. Therefore, the Al content is 0.1% or less.
- N 0.01% or less
- the balance is Fe and inevitable impurities.
- the balance includes at least one selected from Cr: 0.01 to 1%, Ti: 0.2% or less, B: 0.0005 to 0.08%, or Sb: 0.003 to 0.03%, individually or simultaneously. It is preferable to contain.
- Cr 0.01-1% 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 is 1% or less, the cost is not significantly increased. Therefore, the upper limit is preferably 1%.
- Ti 0.2% or less
- Ti is an element effective for strengthening steel and improving toughness by refining. It is also an element effective for forming a nitride in preference to B, which will be described next, and exhibiting the effect of improving hardenability by solid solution B.
- the Ti content is preferably 0.02% or more.
- the amount of Ti is 0.2% or less, the rolling load during hot rolling does not increase extremely, and the toughness of the hot pressed member does not decrease, so the upper limit may be 0.2% preferable.
- Sb has an effect of suppressing a decarburized layer generated in the steel sheet surface layer portion between the time when the steel plate is heated before hot pressing and the time when the steel plate is cooled by a series of processes of hot pressing.
- the amount is preferably 0.003% or more.
- the Sb amount is preferably 0.003 to 0.03%.
- the causes of the decrease in paint adhesion, perforated corrosion resistance, and seam corrosion resistance in hot pressed members with a Zn-based plating layer on the surface are the heating before hot pressing. This is because voids are formed at the interface between ZnO that is sometimes generated and the steel sheet or Zn-based plating layer. In order to suppress the formation of the voids, it is effective to set the average ferrite particle size on the surface of the base steel sheet to 20 ⁇ m or less. This is because if the ferrite grain size is 20 ⁇ m or less, the plating layer component diffuses into the ferrite grains during heating, and the plating layer remains almost uniformly reduced.
- the average ferrite particle size is determined as follows. A polished sample having a cross section in the plate thickness direction of the steel sheet and perpendicular to the rolling direction is prepared, and a photograph of the surface of the steel sheet is taken at a magnification of 400 by microscopic observation. From this image, according to the cutting method of JIS G 0552, the number of ferrite particles in an arbitrary straight line in the direction perpendicular to the thickness direction of the steel sheet near the surface of the steel sheet is calculated by image processing, and the average value is obtained.
- the ferrite grain size on the steel sheet surface which is the interface between the plating layer and the underlying steel sheet, should be 20 ⁇ m or less, and the Zn-Ni alloy plating with a high melting point (containing 10-25 mass% Ni with the balance being Zn and inevitable)
- the effect of suppressing the generation of ZnO accompanying the melting of the plating layer that occurs in a high temperature environment during hot pressing and increasing the remaining of the plating layer is increased.
- the effect of substantially uniforming the diffusion of the plating component into the ferrite grains is also increased.
- the ferrite grain size on the steel sheet surface which is the interface between the plating layer and the underlying steel sheet, should be 20 ⁇ m or less, and the Zn-Ni alloy plating with a high melting point (containing 10 to 25 mass% Ni with the balance being Zn)
- the Zn-Ni alloy plating with a high melting point containing 10 to 25 mass% Ni with the balance being Zn
- the steel plate surface is the interface between the plating layer and the base steel plate, and when the cross-section in the plate thickness direction is observed, it is the outermost layer portion of the steel plate in contact with the lowermost plating layer when the plating layer is formed. is there.
- the steel sheet having the above composition may be subjected to heat treatment at 760 to 840 ° C. before the formation of the Zn-based plating layer.
- the hot-pressed steel sheet of the present invention described above is hot-pressed after being heated to a temperature range of Ac 3 transformation point to 1000 ° C. to become a hot-pressed member.
- the reason for heating above the Ac 3 transformation point before hot pressing is to form a hard phase such as a martensite phase by rapid cooling during hot pressing, thereby increasing the strength of the member.
- the upper limit of the heating temperature is set to 1000 ° C. because when the temperature exceeds 1000 ° C., a large amount of ZnO is generated on the surface of the plating layer.
- the heating temperature here means the highest temperature reached of the steel sheet.
- the average temperature increase rate during heating before hot pressing is not particularly limited, and is preferably 2 to 200 ° C./s, for example. Formation of ZnO on the surface of the plating layer, formation of voids between ZnO and the steel plate or plating layer, and generation of local scales in the defective part of the plating layer result in a long high-temperature residence time during which the steel plate is exposed to high-temperature conditions. Therefore, the higher the average temperature rise rate, the better. Further, the holding time at the maximum plate temperature is not particularly limited, and is preferably shorter for the same reason as described above, preferably 300 s or less, more preferably 120 s or less, more preferably 10 s or less. And
- heating by an electric furnace or a gas furnace flame heating, current heating, high frequency heating, induction heating, etc. can be exemplified.
- steel sheets No. 1 to 32 having a plating type, an adhesion amount, and a Ni content plating layer as shown in Table 1 were produced by electroplating or hot dipping.
- the steel plates No. 1 to 32 thus obtained were heated under the heating conditions shown in Table 1 by an electric furnace or direct energization, and then sandwiched between Al molds and cooled at a cooling rate of 50 ° C./s. Simulate the press.
- Average ferrite grain size Polishing the thickness of the cold rolled steel sheet after annealing and before plating treatment, after nital corrosion, taking three micrographs (magnification 400 times) of the outermost layer, and performing image analysis in each field.
- the ferrite particle diameter on the surface was measured according to the cutting method of JIS G0552, and the average value of the three fields of view was determined as the average ferrite particle diameter.
- Paint adhesion A sample (70mm x 150mm) was taken from a steel plate after simulating a hot press, subjected to chemical conversion treatment under standard conditions using PB-SX35 manufactured by Nihon Parkerizing Co., Ltd., then Kansai Paint ( An electrodeposition paint GT-10HT gray manufactured by Co., Ltd. was formed into a film with a thickness of 20 ⁇ m under a baking condition of 170 ° C. for 20 minutes to prepare a coating test piece.
- Joint corrosion resistance Take a large sample (70mm x 150mm) and a small sample (40mm x 110mm) from the steel plate after simulating hot press, and small sample in the middle of the large sample After layering (joint) and joining by welding, this sample was subjected to chemical conversion treatment under standard conditions using PB-SX35 made by Nihon Parkerizing Co., Ltd., then electrodeposition paint GT made by Kansai Paint Co., Ltd.
- the actual hot pressing is not performed.
- paint adhesion, perforated corrosion resistance, seam corrosion resistance, and mold adhesion are affected by changes in the plating layer due to heating before hot pressing. Evaluation of paint adhesion, perforated corrosion resistance, joint corrosion resistance, and mold adhesion resistance.
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Abstract
Description
i) 特許文献2や3に記載の熱間プレス部材における塗料密着性、穴あき耐食性、合わせ目耐食性の低下の原因は、熱間プレス前の加熱時に生成するZnOと鋼板やZn系めっき層との界面に空隙が形成されるためである。
ii) この空隙の生成を抑制するには、めっき層の下地鋼板表面の平均フェライト粒径を20μm以下にすることが効果的である。
1-1) Zn系めっき層
本発明では、熱間プレス前の加熱時にスケールの生成を抑制するために、鋼板表面に付着量が10~90g/m2のZn系めっき層を設ける。ここで、めっき層の付着量(鋼板の片面当り)を10~90g/m2としたのは、10g/m2未満ではZnの犠牲防食効果が十分に発揮されず、90g/m2を超えるとその効果が飽和し、コストアップを招くためである。
980MPa以上の強度を有する熱間プレス部材を得るには、めっき層の下地鋼板として、例えば、質量%で、C:0.15~0.5%、Si:0.05~2.0%、Mn:0.5~3%、P:0.1%以下、S:0.05%以下、Al:0.1%以下、N:0.01%以下を含有し、残部がFeおよび不可避的不純物からなる成分組成を有する熱延鋼板や冷延鋼板を用いることができる。各成分元素の限定理由を、以下に説明する。ここで、成分の含有量を表す「%」は、特に断らない限り「質量%」を意味する。
Cは、鋼の強度を向上させる元素であり、熱間プレス部材のTSを980MPa以上にするには、その量を0.15%以上とする必要がある。一方、C量が0.5%を超えると、素材の鋼板のブランキング加工性が著しく低下する。したがって、C量は0.15~0.5%とする。
Siは、C同様、鋼の強度を向上させる元素であり、熱間プレス部材のTSを980MPa以上にするには、その量を0.05%以上とする必要がある。一方、Si量が2.0%を超えると、熱間圧延時に赤スケールと呼ばれる表面欠陥の発生が著しく増大するとともに、圧延荷重が増大したり、熱延鋼板の延性の劣化を招く。さらに、Si量が2.0%を超えると、ZnやAlを主体としためっき皮膜を鋼板表面に形成するめっき処理を施す際に、めっき処理性に悪影響を及ぼす場合がある。したがって、Si量は0.05~2.0%とする。
Mnは、フェライト変態を抑制して焼入れ性を向上させるのに効果的な元素であり、また、Ac3変態点を低下させるので、熱間プレス前の加熱温度を低下するにも有効な元素である。このような効果の発現のためには、その量を0.5%以上とする必要がある。一方、Mn量が3%を超えると、偏析して素材の鋼板および熱間プレス部材の特性の均一性が低下する。したがって、Mn量は0.5~3%とする。
P量が0.1%を超えると、偏析して素材の鋼板および熱間プレス部材の特性の均一性が低下するとともに、靭性も著しく低下する。したがって、P量は0.1%以下とする。
S量が0.05%を超えると、熱間プレス部材の靭性が低下する。したがって、S量は0.05%以下とする。
Al量が0.1%を超えると、素材の鋼板のブランキング加工性や焼入れ性を低下させる。したがって、Al量は0.1%以下とする。
N量が0.01%を超えると、熱間圧延時や熱間プレス前の加熱時にAlNの窒化物を形成し、素材の鋼板のブランキング加工性や焼入れ性を低下させる。したがって、N量は0.01%以下とする。
Crは、鋼を強化するとともに、焼入れ性を向上させるのに有効な元素である。こうした効果の発現のためには、Cr量を0.01%以上とすることが好ましい。一方、Cr量が1%以下であれば、著しいコスト高を招くことがないため、その上限は1%とすることが好ましい。
Tiは、鋼を強化するとともに、細粒化により靭性を向上させるのに有効な元素である。また、次に述べるBよりも優先して窒化物を形成して、固溶Bによる焼入れ性の向上効果を発揮させるのに有効な元素でもある。こうした効果の発現のためには、Ti量を0.02%以上とすることが好ましい。一方、Ti量が0.2%以下であれば、熱間圧延時の圧延荷重が極端に増大することがなく、また、熱間プレス部材の靭性が低下しないので、その上限は0.2%とすることが好ましい。
Bは、熱間プレス時の焼入れ性や熱間プレス後の靭性向上に有効な元素である。こうした効果の発現のためには、B量を0.0005%以上とすることが好ましい。一方、B量が0.08%以下であれば、熱間圧延時の圧延荷重が極端に増大せず、また、熱間圧延後にマルテンサイト相やベイナイト相が生じることがなく鋼板の割れなどが生じないので、その上限は0.08%とすることが好ましい。
Sbは、熱間プレス前に鋼板を加熱してから熱間プレスの一連の処理によって鋼板を冷却するまでの間に鋼板表層部に生じる脱炭層を抑制する効果を有する。このような効果の発現のためにはその量を0.003%以上とすることが好ましい。一方、Sb量が0.03%以下であれば、圧延荷重の増大を招くことがなく、生産性を低下させることがない。したがって、Sb量は0.003~0.03%とすることが好ましい。
上述したように、表面にZn系めっき層を設けた熱間プレス部材における塗料密着性、穴あき耐食性、合わせ目耐食性の低下の原因は、熱間プレス前の加熱時に生成するZnOと鋼板やZn系めっき層との界面に空隙が形成されるためである。この空隙の生成を抑制するには、下地鋼板表面の平均フェライト粒径を20μm以下にすることが効果的である。これは、フェライト粒径を20μm以下にすると加熱時にめっき層成分のフェライト粒内への拡散が粒内全域に生じ、めっき層の残存がおおむね均一に少なくなる。その結果、めっき表層に形成されるZnOと鋼板やめっき層との間に空隙が少なくなると考えられる。
なお、平均フェライト粒径は、次のようにして求める。鋼板の板厚方向の断面であって、圧延方向に直角な方向の断面の研磨試料を作製し、顕微鏡観察により鋼板表面部の写真を400倍にて撮影する。この画像から、JIS G 0552の切断法に準拠して、鋼板表面近傍の、鋼板板厚方向に直角な方向の任意の直線におけるフェライト粒子数を画像処理によって算出し、平均値を求める。
上記した本発明の熱間プレス用鋼板は、Ac3変態点~1000℃の温度範囲に加熱後熱間プレスされて熱間プレス部材となる。熱間プレス前にAc3変態点以上に加熱するのは、熱間プレス時の急冷でマルテンサイト相などの硬質相を形成し、部材の高強度化を図るためである。また、加熱温度の上限を1000℃としたのは、1000℃を超えるとめっき層表面に多量のZnOが生成するためである。なお、ここでいう加熱温度とは鋼板の最高到達温度のことをいう。
◎:剥離なし
○:1~10個の碁盤目で剥離
△:11~30個の碁盤目で剥離
×:31個以上の碁盤目で剥離
穴あき耐食性:熱間プレスをシミュレート後の鋼板からサンプル(70mm×150mm)を採取し、サンプルの非評価面および端面をテープでシールした後、塩水噴霧(5質量%NaCl水溶液、35℃、2h)→乾燥(60℃、相対湿度20~30%、4h)→湿潤(50℃、相対湿度95%、2h)を1サイクルとする複合腐食試験を150サイクル実施し、腐食生成物とめっき層を塩酸で除去した。その後、マイクロメーターを用いて腐食の顕著な10箇所の部位の板厚Tn(n=1~10)と腐食していない5箇所のシール部の平均板厚T0を測定し、(T0-Tn)の最大値、すなわち最大板厚減少値を求め、以下の基準で評価し、◎、○、△であれば本発明の目的を満足しているとした。
◎:最大板厚減少値≦0.1mm
○:0.1mm<最大板厚減少値≦0.2mm
△:0.2mm<最大板厚減少値≦0.3mm
×:0.3mm<最大板厚減少値
合わせ目耐食性:熱間プレスをシミュレート後の鋼板から大サンプル(70mm×150mm)と小サンプル(40mm×110mm)を採取し、大サンプルの中央に小サンプルを重ねて(合わせ目)、溶接にて接合し、このサンプルを日本パーカライジング(株)製PB-SX35を使用して標準条件で化成処理を施した後、関西ペイント(株)製電着塗料GT-10HTグレーを170℃×20分間の焼付け条件で膜厚20μm成膜して合わせ目試験片を作製した。作製した合わせ目試験片の非評価面をテープでシールした後、塩水噴霧(5質量%NaCl水溶液、35℃、2h)→乾燥(60℃、相対湿度20~30%、4h)→湿潤(50℃、相対湿度95%、2h)を1サイクルとする複合腐食試験を150サイクル実施し、試験後のサンプルの溶接部に穴を開けて解体し、合わせ目内の最大腐食深さを求め、以下の基準で評価し、◎、○、△であれば本発明の目的を満足しているとした。
◎:最大腐食深さ≦0.1mm
○:0.1mm<最大腐食深さ≦0.2mm
△:0.2mm<最大腐食深さ≦0.4mm
×:0.4mm<最大腐食深さ
耐金型付着性:熱間プレス時の金型へのめっき成分の付着を評価するために、熱間プレス前のサンプル(50×500mm)を採取し、サンプルを炉温890℃で加熱し、板温700℃時に金型でサンプルを挟んで50mm/sにて摺動し、金型へのめっき成分の付着状態を目視により観察した。
その状態を以下の基準で評価し、◎、○であれば良好とした。
◎:付着なし
○:わずかに付着あり
△:明らかに付着あり
×:著しく付着あり
結果を表1に示す。本発明例では、いずれも塗料密着性、穴あき耐食性、合わせ目耐食性、耐金型付着性に優れていることがわかる。
Claims (8)
- 鋼板表面の平均フェライト粒径が20μm以下である鋼板上に、付着量が10~90g/m2のZn系めっき層を有することを特徴とする熱間プレス用鋼板。
- 前記Zn系めっき層が、10~25質量%のNiを含み、残部がZnおよび不可避的不純物からなるめっき層であることを特徴とする請求項1に記載の熱間プレス用鋼板。
- 前記Zn系めっき層中に含まれるη相の量が5質量%以下であることを特徴とする請求項2記載の熱間プレス用鋼板。
- 前記Zn系めっき層の下地鋼板が、質量%で、C:0.15~0.5%、Si:0.05~2.0%、Mn:0.5~3%、P:0.1%以下、S:0.05%以下、Al:0.1%以下、N:0.01%以下を含有し、残部がFeおよび不可避的不純物からなる成分組成を有することを特徴とする請求項1から3のいずれか一項に記載の熱間プレス用鋼板。
- 前記Zn系めっき層の下地鋼板が、さらに、質量%で、Cr:0.01~1%、Ti:0.2%以下、B:0.0005~0.08%のうちから選ばれた少なくとも一種を含有することを特徴とする請求項4に記載の熱間プレス用鋼板。
- 前記Zn系めっき層の下地鋼板が、さらに、質量%で、Sb:0.003~0.03%を含有することを特徴とする請求項4または5に記載の熱間プレス用鋼板。
- 請求項4から6のいずれか一項に記載の成分組成を有する鋼板を、760~840℃の熱処理後、付着量が10~90g/m2のZn系めっき層を形成することを特徴とする熱間プレス用鋼板の製造方法。
- 請求項1から6のいずれか一項に記載の熱間プレス用鋼板を、Ac3変態点~1000℃の温度範囲に加熱後、熱間プレスすることを特徴とする熱間プレス部材の製造方法。
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CN201380011181.1A CN104136650B (zh) | 2012-03-07 | 2013-03-04 | 热压用钢板、其制造方法和使用该热压用钢板的热压部件的制造方法 |
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