TWI555879B - 熱壓用鋼板、其製造方法、以及使用其的熱壓構件的製造方法 - Google Patents
熱壓用鋼板、其製造方法、以及使用其的熱壓構件的製造方法 Download PDFInfo
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- TWI555879B TWI555879B TW102107722A TW102107722A TWI555879B TW I555879 B TWI555879 B TW I555879B TW 102107722 A TW102107722 A TW 102107722A TW 102107722 A TW102107722 A TW 102107722A TW I555879 B TWI555879 B TW I555879B
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- Prior art keywords
- steel sheet
- plating layer
- hot
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- 229910000831 Steel Inorganic materials 0.000 title claims description 98
- 239000010959 steel Substances 0.000 title claims description 98
- 238000007731 hot pressing Methods 0.000 title claims description 45
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000000034 method Methods 0.000 title description 19
- 230000008569 process Effects 0.000 title description 5
- 238000007747 plating Methods 0.000 claims description 100
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 43
- 239000002245 particle Substances 0.000 claims description 20
- 229910000859 α-Fe Inorganic materials 0.000 claims description 19
- 229910052742 iron Inorganic materials 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 79
- 238000005260 corrosion Methods 0.000 description 43
- 230000007797 corrosion Effects 0.000 description 42
- 238000010438 heat treatment Methods 0.000 description 25
- 238000005755 formation reaction Methods 0.000 description 15
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 239000000956 alloy Substances 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 239000003973 paint Substances 0.000 description 7
- 229910007567 Zn-Ni Inorganic materials 0.000 description 5
- 229910007614 Zn—Ni Inorganic materials 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 230000009466 transformation Effects 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
- 239000010960 cold rolled steel Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000000126 substance 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
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 150000004767 nitrides Chemical class 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
- 239000002344 surface layer Substances 0.000 description 2
- 239000011800 void material Substances 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
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 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
- 238000005275 alloying Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002050 diffraction 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
- 238000005485 electric heating Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 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
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
-
- 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
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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
- C21D1/62—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
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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
- C21D8/0221—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
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- C—CHEMISTRY; METALLURGY
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- C22C—ALLOYS
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- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C—ALLOYS
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- 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
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- C—CHEMISTRY; METALLURGY
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- 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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
- C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
- C23C2/29—Cooling or quenching
-
- 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
-
- 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]
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Electrochemistry (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Sheet Steel (AREA)
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Description
本發明是有關於一種適於藉由熱壓製造自動車的底盤(undercarriage)構件或車身結構構件等的熱壓用鋼板、其製造方法、以及使用其的熱壓構件的製造方法。
先前以來,自動車的底盤構件或車身結構構件等多數是將具有特定強度的鋼板進行壓製加工而製造。近年來,就保護地球環境的觀點而言,熱切期望自動車車身的輕量化,並持續將所使用的鋼板進行高強度化,而降低其板厚的努力。但是,隨著鋼板的高強度化而其壓製加工性降低,因此多數情況下難以將鋼板加工成所期望的構件形狀。
因此,專利文獻1中提出被稱為熱壓的加工技術,其使用包含模(die)與衝頭的模具對經加熱的鋼板進行加工,同時進行急冷,藉此可同時實現加工的容易化與高強度化。但是,該熱壓中存在以下問題:由於在熱壓前將鋼板加熱至950℃左右的高的
溫度,因此於鋼板表面生成銹皮(scale)(鐵氧化物),在熱壓時該銹皮剝離,而損傷模具,或者損傷熱壓後的構件表面。另外,構件表面所殘留的銹皮亦成為外觀不良或塗裝密接性降低的原因。因此,通常進行酸洗或珠粒噴擊(shot blast)等處理而將構件表面的銹皮除去,但這會使製造步驟變得複雜,並導致生產性降低。而且,自動車的底盤構件或車身結構構件等亦需要優異的耐蝕性,但在藉由如上所述的步驟而製造的熱壓構件中,並未設置鍍敷層(plating layer)等防銹皮膜,因此耐蝕性仍不充分。
因此,期望可在熱壓前的加熱時抑制銹皮的生成並提高熱壓後的構件的耐蝕性的熱壓技術,並提出在表面設置鍍敷層等皮膜的鋼板或使用其的熱壓方法。例如,專利文獻2中揭示,將藉由Zn或Zn基合金(base alloy)被覆的鋼板熱壓,在表面設置Zn-Fe基質化合物(base compound)或Zn-Fe-Al基質化合物的耐蝕性優異的熱壓構件的製造方法。另外,專利文獻3中揭示,以700℃~1000℃將合金化熔融鍍Zn鋼板加熱2分鐘~20分鐘後進行熱壓,而在表面設置包含Fe-Zn固溶相的鍍敷層的加工性、溶接性、耐蝕性優異的熱壓成形品(構件)。
現有技術文獻
專利文獻
專利文獻1:英國專利第1490535號公報
專利文獻2:日本專利第3663145號公報
專利文獻3:日本專利第4039548號公報
然而,藉由專利文獻2所記載的方法而製造的熱壓構件或專利文獻3所記載的熱壓構件中,存在以下情況:塗料密接性降低,或者對在未覆蓋化成處理皮膜或電鍍塗膜的部位容易引起的開孔腐蝕的耐蝕性(以下稱為開孔耐蝕性)、或鋼板的重合部的耐蝕性(以下稱為接縫耐蝕性)降低。
本發明的目的是提供一種能以高概率獲得塗料密接性、開孔耐蝕性、接縫耐蝕性優異的熱壓構件的熱壓用鋼板、其製造方法、及使用該製造方法的熱壓構件的製造方法。
本發明者等人對上述目標熱壓用鋼板進行銳意研究,結果獲得以下發現。
i)專利文獻2或專利文獻3所記載的熱壓構件的塗料密接性、開孔耐蝕性、接縫耐蝕性的降低的原因,是由於在熱壓前的加熱時所生成的ZnO與鋼板或Zn系鍍敷層的界面形成空隙。
ii)為了抑制該空隙的生成,有效的是將鍍敷層的基底鋼板表面的平均肥粒鐵(ferrite)粒徑設為20μm以下。
本發明是基於此種發現而成,提供一種熱壓用鋼板,其特徵在於:在鋼板表面的平均肥粒鐵粒徑為20μm以下的鋼板上,具有附著量為10g/m2~90g/m2的Zn系鍍敷層。
本發明的熱壓用鋼板中,較佳為Zn系鍍敷層是含有10質量%~25質量%的Ni且其餘部分包含Zn及不可避免的雜質的鍍敷層。
本發明的熱壓用鋼板中,較佳為Zn系鍍敷層中所含的η相的量為5質量%以下,更佳為2質量%以下。
另外,作為Zn系鍍敷層的基底鋼板,可使用具有以下的成分組成的鋼板:以質量%計含有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,其餘部分包含Fe及不可避免的雜質。
該基底鋼板中,較佳為以質量%計分別或同時更含有選自Cr:0.01%~1%、Ti:0.2%以下、B:0.0005%~0.08%中的至少一種或Sb:0.003%~0.03%。
本發明的熱壓用鋼板可藉由將具有上述成分組成的鋼板進行760℃~840℃的熱處理後,形成附著量為10g/m2~90g/m2的Zn系鍍敷層而製造。
本發明另外提供一種熱壓構件的製造方法,其特徵在於:將如上所述的熱壓用鋼板加熱至Ac3變態點~1000℃的溫度範圍後進行熱壓。
根據本發明,可製造能以高的概率獲得塗料密接性、開孔耐蝕性、接縫耐蝕性優異的熱壓構件的熱壓用鋼板。使用本發明的熱壓用鋼板,藉由本發明的熱壓構件的製造方法而製造的熱壓構件,其外觀亦良好,適合於自動車的底盤構件或車身結構構件。
1)熱壓用鋼板
1-1)Zn系鍍敷層
本發明中,為了在熱壓前的加熱時抑制銹皮的生成,而在鋼板表面設置附著量為10g/m2~90g/m2的Zn系鍍敷層。此處,將鍍敷層的附著量(鋼板的每單面)設為10g/m2~90g/m2的原因是,在小於10g/m2時,不會充分發揮Zn的犧牲防蝕效果,若超過90g/m2,則其效果飽和,而導致成本上升。
作為Zn系鍍敷層,除了純Zn的鍍敷層(例如藉由網格Zn線或熔融鍍Zn線形成的鍍敷層)外,可列舉:Zn-Ni合金鍍敷層、Zn-Fe合金鍍敷層(藉由熔融鍍Zn線實施合金化處理的鍍敷層)、Zn-Cr合金鍍敷層、Zn-Mn合金鍍敷層、Zn-Co合金鍍敷層、Zn-Cr-Ni合金鍍敷層、Zn-Cr-Fe合金鍍敷層、Zn-Cr-Co合金鍍敷層、Zn-Al合金鍍敷層(例如Zn-5%Al鍍敷層或Zn-55%Al鍍敷層)、Zn-Mg合金鍍敷層、Zn-Al-Mg合金鍍敷層(例如Zn-6%Al-3%Mg鍍敷層或Zn-11%Al-3%Mg鍍敷層)等。另外,亦可應用在如此的Zn系鍍敷層中分散有金屬氧化物或聚合物等的Zn系複合鍍敷層(例如Zn-SiO2分散鍍敷層),亦可製成將如此的Zn系鍍敷層進行多層積層而成的鍍敷層。
特別是較佳為製成Ni含有率為10質量%~25質量%的Zn-Ni合金鍍敷層。其原因是,在該Zn-Ni合金系中,形成具有
Ni2Zn11、NiZn3、Ni5Zn21的任一種結晶結構的熔點高為881℃的γ相,因此可將熱壓前的加熱時的銹皮或ZnO的生成反應抑制在最小限度。另外,由於熔點高,而在熱壓時抑制鍍敷成分向肥粒鐵粒內的擴散速度,由於鍍敷層的減少變小,因此耐蝕性的劣化變少。另外,由於在加熱時未形成Zn-Fe金屬化合物,因此亦抑制伴隨龜裂的產生的銹皮的生成。而且,在熱壓完畢後,鍍敷層亦以γ相殘存,因此藉由Zn的犧牲防蝕效果而發揮優異的耐蝕性。
另外,Ni含有率為10質量%~25質量%的γ相的形成與Ni-Zn合金的平衡狀態圖未必一致。其原因認為,藉由電鍍(electroplating)法等進行的鍍敷層的形成反應不平衡地進行。Ni2Zn11、NiZn3、Ni5Zn21的γ相可藉由使用X射線繞射法或穿透式電子顯微鏡(Transmission Electron Microscopy,TEM)的電子束繞射法進行確認。另外,藉由將鍍敷層的Ni含有率設為10質量%~25質量%,而如上所述般形成γ相。但是,由於電鍍的條件等,除了γ相外,還混合存在少許η相。此時,為了將加熱時的ZnO的生成反應抑制在最小限度,η相的量較佳為5質量%以下。更佳為將η相的量設為2質量%以下。原因是,在2質量%以下時,可抑制上述ZnO的生成,並可在熱壓時抑制鍍敷成分在模具上的附著,而可減少連續壓製時的在材料上的再附著或模具修理。η相的量以η相的重量相對於鍍敷層的總重量的重量比來定義,例如可藉由陽極溶解法等進行定量。
如此的鍍敷層的形成方法並無特別限定。鍍敷層的形成
方法可應用公知的電解法(水溶液中或非水溶液中的電解)、熔融法、氣相法等。
1-2)基底鋼板的成分組成
為了獲得具有980MPa以上的強度的熱壓構件,作為鍍敷層的基底鋼板,例如可使用具有以下成分組成的熱軋鋼板或冷軋鋼板:以質量%計含有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,其餘部分包含Fe及不可避免的雜質。以下說明各成分元素的限定理由。此處,表示成分的含量的「%」只要無特別說明,則表示「質量%」。
C:0.15%~0.5%
C是使鋼的強度提高的元素,為了將熱壓構件的拉伸強度(tensile strength,TS)設為980MPa以上,而需要將其量設為0.15%以上。另一方面,若C量超過0.5%,則原材料的鋼板的下料(blanking)加工性明顯降低。因此,C量設為0.15%~0.5%。
Si:0.05%~2.0%
Si與C同樣,是使鋼的強度提高的元素,為了將熱壓構件的TS設為980MPa以上,需要將其量設為0.05%以上。另一方面,若Si量超過2.0%,則熱軋時被稱為紅銹皮的表面缺陷的產生明顯增加,並且軋製負荷增大,或導致熱軋鋼板的延性的劣化。而且,若Si量超過2.0%,則在實施於鋼板表面形成以Zn或Al為主體的鍍敷皮膜的鍍敷處理時,有對鍍敷處理性造成不良影響的情況。
因此Si量設為0.05%~2.0%。
Mn:0.5%~3%
Mn是對於抑制肥粒鐵變態而提高淬火性有效的元素,並且使Ac3變態點降低,因此是對於降低熱壓前的加熱溫度亦有效的元素。為了表現此種效果,需要將其量設為0.5%以上。另一方面,若Mn量超過3%,則發生偏析而原材料的鋼板及熱壓構件的特性的均勻性降低。因此,Mn量設為0.5%~3%。
P:0.1%以下
若P量超過0.1%,則發生偏析而原材料的鋼板及熱壓構件的特性的均勻性降低,並且韌性亦明顯降低。因此,P量設為0.1%以下。
S:0.05%以下
若S量超過0.05%,則熱壓構件的韌性降低。因此,S量設為0.05%以下。
Al:0.1%以下
若Al量超過0.1%,則使原材料的鋼板的下料加工性或淬火性降低。因此,Al量設為0.1%以下。
N:0.01%以下
若N量超過0.01%,則熱軋時或熱壓前的加熱時形成AlN的氮化物,而使原材料的鋼板的下料加工性或淬火性降低。因此,N量設為0.01%以下。
其餘部分為Fe及不可避免的雜質。根據以下理由,較
佳為其餘部分分別或同時含有選自Cr:0.01%~1%、Ti:0.2%以下、B:0.0005%~0.08%中的至少一種或Sb:0.003%~0.03%。
Cr:0.01%~1%
Cr是對於將鋼強化並提高淬火性有效的元素。為了表現如此的效果,較佳為將Cr量設為0.01%以上。另一方面,若Cr量為1%以下,則不會導致明顯的高成本,因此,較佳為其上限設為1%。
Ti:0.2%以下
Ti是對於將鋼強化並藉由細粒化而提高韌性有效的元素。另外,亦是對於比下文所述的B優先形成氮化物,而發揮因固溶B所致的淬火性的提高效果有效的元素。為了表現如此的效果,較佳為將Ti量設為0.02%以上。另一方面,若Ti量為0.2%以下,則熱軋時的軋製負荷不會極端增大,且熱壓構件的韌性不會降低,因此較佳為其上限設為0.2%。
B:0.0005%~0.08%
B是對於提高熱壓時的淬火性或熱壓後的韌性有效的元素。為了表現如此的效果,較佳為將B量設為0.0005%以上。另一方面,若B量為0.08%以下,則熱軋時的軋製負荷不會極端增大,且在熱軋後不會產生麻田散鐵相或變韌鐵相,而不會產生鋼板的破裂等,因此較佳為其上限設為0.08%。
Sb:0.003%~0.03%
Sb具有抑制脫碳層的效果,該脫碳層在熱壓前將鋼板加熱後直至藉由熱壓的一系列處理將鋼板冷卻為止的期間產生於鋼板表
層部。為了表現此種的效果,較佳為將其量設為0.003%以上。另一方面,若Sb量為0.03%以下,則不會導致軋製負荷增大,不會使生產性降低。因此較佳為Sb量設為0.003%~0.03%。
1-3)基底鋼板的組織
如上所述,在表面設置Zn系鍍敷層的熱壓構件的塗料密接性、開孔耐蝕性、接縫耐蝕性的降低的原因,是由於在熱壓前的加熱時所生成的ZnO與鋼板或Zn系鍍敷層的界面形成空隙。為了抑制該空隙的生成,有效的是將基底鋼板表面的平均肥粒鐵粒徑設為20μm以下。其原因是,若將肥粒鐵粒徑設為20μm以下,則在加熱時會在粒內整個區域產生鍍敷層成分向肥粒鐵粒內的擴散,而鍍敷層的殘存會大致均勻地變少。其結果認為,在鍍敷表層所形成的ZnO與鋼板或鍍敷層之間,空隙變少。另外,平均肥粒鐵粒徑以如下所述方式求出。製作鋼板的板厚方向的剖面、且與軋製方向成直角的方向的剖面的研磨試樣,藉由顯微鏡觀察以400倍拍攝鋼板表面部的照片。根據該圖像,依據JIS G 0552的切割法,藉由圖像處理算出鋼板表面附近的與鋼板板厚方向成直角的方向的任意直線的肥粒鐵粒子數,並求出平均值。
另一方面,若平均肥粒鐵粒徑超過20μm,則鍍敷層成分不會向肥粒鐵粒內擴散,而僅在肥粒鐵粒與鍍敷層接觸的表面附近停止擴散。然後,殘存的鍍敷層藉由加熱溫度而熔融並凝聚,藉此殘存的鍍敷層成為不均勻的狀態。其結果,形成於鍍敷表層的ZnO亦成為不均勻的狀態,該ZnO與鋼板或鍍敷層之間的空隙
增大,因此欠佳。
接著,藉由將成為鍍敷層與基底鋼板的界面的鋼板表面的肥粒鐵粒徑設為20μm以下、且與熔點高的鍍Zn-Ni合金(含有10質量%~25質量%的Ni,其餘部分包含Zn及不可避免的雜質)組合,而抑制伴隨著鍍敷層的熔融的ZnO生成,而使鍍敷層的殘存提高的效果特別地增大,上述鍍敷層是在熱壓時的高溫環境中產生。另外,可使鍍敷成分向肥粒鐵粒內的擴散大致均勻化的效果亦增大。因此,若將成為鍍敷層與基底鋼板的界面的鋼板表面的肥粒鐵粒徑設為20μm以下、且與熔點高的鍍Zn-Ni合金(含有10質量%~25質量%的Ni,其餘部分包含Zn及不可避免的雜質)組合,則可進一步提高塗料密接性、開孔耐蝕性及接縫耐蝕性。
另外,所謂鋼板表面,如上所述般,是鍍敷層與基底鋼板的界面,在進行板厚方向的剖面觀察時,是與形成鍍敷層時的鍍敷最下層接觸的鋼板的最表層部。
為了將基底鋼板表面的平均肥粒鐵粒徑設為20μm以下,只要在具有上述成分組成的鋼板上,在Zn系鍍敷層的形成前實施760℃~840℃的熱處理即可。
2)熱壓構件的製造方法
上述的本發明的熱壓用鋼板加熱至Ac3變態點~1000℃的溫度範圍後進行熱壓而成為熱壓構件。在熱壓前加熱至Ac3變態點以上的原因是,藉由熱壓時的急冷形成麻田散鐵相等硬質相,而
實現構件的高強度化。另外,將加熱溫度的上限設為1000℃的原因是,若超過1000℃,則在鍍敷層表面生成大量的ZnO。另外,此處所謂的加熱溫度,是指鋼板的最高到達溫度。
熱壓前的加熱時的平均升溫速度並無特別限定,例如較佳為2℃/s~200℃/s。關於鍍敷層表面的ZnO的生成、或在ZnO與鋼板或鍍敷層之間的空隙的形成、鍍敷層的缺陷部的局部的銹皮的生成,是鋼板暴露於高溫條件下的高溫滯留時間越長越增大,因此平均升溫速度越快越佳。另外,關於最高到達板溫的保持時間,亦無特別限定,藉由與上述相同的理由,宜設為短時間,較佳為設為300秒(s)以下,更佳為設為120s以下,尤佳為設為10s以下。
作為熱壓前的加熱方法,可例示:藉由電爐或煤氣爐等的加熱、火焰加熱、通電加熱、高頻加熱、感應加熱等。
實施例
作為基底鋼板,使用具有如下的成分組成、Ac3變態點為820℃、板厚1.6mm的冷軋狀態的鋼板,上述成分組成以質量%計含有C:0.23%、Si:0.25%、Mn:1.2%、P:0.01%、S:0.01%、Al:0.03%、N:0.005%、Cr:0.2%、Ti:0.02%、B:0.0022%、Sb:0.008%,其餘部分包含Fe及不可避免的雜質。改變溫度對該冷軋狀態的鋼板實施退火,而製作鋼板表面的平均肥粒鐵粒徑不同的冷軋鋼板。
在退火後的冷軋鋼板的表面,藉由電鍍法或熔融鍍敷
法,製作具有如表1所示的鍍敷種、附著量、Ni含有率的鍍敷層的鋼板No.1~No.32。
藉由電爐或直接通電,在表1所示的加熱條件下,將如此獲得的鋼板No.1~No.32加熱後,藉由Al製模具夾入而以冷卻速度50℃/s進行冷卻,而模擬熱壓。
藉由以下方法調查基底鋼板表面的平均肥粒鐵粒徑、及模凝熱壓的鋼板的塗料密接性、開孔耐蝕性、接縫耐蝕性、及耐模具附著性。
平均肥粒鐵粒徑:將退火後鍍敷處理前的冷軋鋼板的板厚剖面進行研磨,在硝酸浸蝕液腐蝕後,拍攝3個視野的最表層部的顯微鏡照片(倍率400倍),在各視野中藉由圖像解析,依據JIS G 0552的切割法測定最表面的肥粒鐵粒徑,求出3個視野的平均值作為平均肥粒鐵粒徑。
塗裝密接性:自模擬熱壓後的鋼板採集樣品(70mm×150mm),使用日本帕卡瀨精(Nihon Parkerizing)(股)製造的PB-SX35,在標準條件下實施化成處理後,在170℃×20分鐘的燒附條件下,將關西塗料(KANSAI PAINT)(股)製造的電鍍塗料GT-10HT灰(gray)形成膜厚20μm的膜,而製作塗裝試驗片。
將所製作的塗裝試驗片於40℃的蒸餾水中浸漬10天,立即對實施了化成處理及電鍍塗裝的面,藉由截切刀切出網格(10個×10個、1mm間隔)的到達至鋼坯為止的切口,進行藉由黏接膠帶進行貼合、剝離的網格膠帶剝離試驗。藉由以下基準進行評價,若為◎、
○,則設為塗裝密接性優異。
◎:無剝離
○:以1個~10個網格剝離
△:以11個~30個網格剝離
×:以31個以上的網格剝離
開孔耐蝕性:自模擬熱壓後的鋼板採集樣品(70mm×150mm),藉由膠帶密封樣品的非評價面及端面後,將鹽水噴霧(5質量%NaCl水溶液、35℃、2小時(h))→乾燥(60℃、相對濕度20%~30%、4h)→濕潤(50℃、相對濕度95%、2h)設為1個循環,實施150個循環的複合腐蝕試驗,將腐蝕產物與鍍敷層藉由鹽酸除去。然後,使用測微計測定腐蝕明顯的10個部位的板厚Tn(n=1~10)、與未腐蝕的5個密封部的平均板厚T0,求出(T0-Tn)的最大值,即為最大板厚減少值,藉由以下基準進行評價,若為◎、○、△,則設為滿足本發明的目的。
◎:最大板厚減少值≦0.1mm
○:0.1mm<最大板厚減少值≦0.2mm
△:0.2mm<最大板厚減少值≦0.3mm
×:0.3mm<最大板厚減少值
接縫耐蝕性:自模擬熱壓後的鋼板採集大樣品(70mm×150mm)與小樣品(40mm×110mm),在大樣品的中央重疊小樣品(接縫),藉由溶接進行接合,使用日本帕卡瀨精(股)製造PB-SX35,在標準條件下,對該樣品實施化成處理後,在170℃×20分鐘的燒
附條件下,將關西塗料(股)製造的電鍍塗料GT-10HT灰形成膜厚20μm的膜,而製作接縫試驗片。藉由膠帶對所製作的接縫試驗片的非評價面進行密封後,將鹽水噴霧(5質量%NaCl水溶液、35℃、2h)→乾燥(60℃、相對濕度20%~30%、4h)→濕潤(50℃、相對濕度95%、2h)設為1個循環,實施150個循環的複合腐蝕試驗,在試驗後的樣品的溶接部開孔而解體,求出接縫內的最大腐蝕深度,藉由以下基準進行評價,若為◎、○、△,則設為滿足本發明的目的。
◎:最大腐蝕深度≦0.1mm
○:0.1mm<最大腐蝕深度≦0.2mm
△:0.2mm<最大腐蝕深度≦0.4mm
×:0.4mm<最大腐蝕深度
耐模具附著性:為了評價熱壓時的鍍敷成分在模具上的附著,而採集熱壓前的樣品(50mm×500mm),以爐溫890℃將樣品加熱,在板溫700℃時藉由模具夾住樣品以50mm/s進行滑動,藉由目視而觀察鍍敷成分在模具上的附著狀態。
藉由以下基準評價其狀態,若為◎、○,則設為良好。
◎:無附著
○:稍有附著
△:明顯有附著
×:顯著有附著
將結果表示於表1。本發明例中可知,塗料密接性、開孔耐蝕
性、接縫耐蝕姓、耐模具附著性均優異。
另外,本實施例中實際上未進行藉由熱壓的加工。但是,塗料密接性、開孔耐蝕性、接縫耐蝕性、及耐模具附著性由於受到因熱壓前的加熱所引起的鍍敷層的變化的制約,因此可藉由本實施例的結果來評價熱壓構件的塗料密接性、開孔耐蝕性、接縫耐蝕性、及耐模具附著性。
Claims (6)
- 一種熱壓用鋼板,其特徵在於:在鋼板表面的平均肥粒鐵粒徑為20μm以下的鋼板上,具有附著量為10g/m2~90g/m2的Zn系鍍敷層,其中上述Zn系鍍敷層中所含的η相的量為5質量%以下,上述Zn系鍍敷層是含有10質量%~25質量%的Ni且其餘部分包含Zn及不可避免的雜質的鍍敷層,且上述Zn系鍍敷層的基底鋼板具有以下的成分組成:以質量%計含有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,其餘部分包含Fe及不可避免的雜質。
- 如申請專利範圍第1項所述的熱壓用鋼板,其中上述Zn系鍍敷層的基底鋼板以質量%計更含有選自Cr:0.01%~1%、Ti:0.2%以下、B:0.0005%~0.08%中的至少一種。
- 如申請專利範圍第2項所述的熱壓用鋼板,其中上述Zn系鍍敷層的基底鋼板以質量%計更含有Sb:0.003%~0.03%。
- 如申請專利範圍第1項所述的熱壓用鋼板,其中上述Zn系鍍敷層的基底鋼板以質量%計更含有Sb:0.003%~0.03%。
- 一種熱壓用鋼板的製造方法,其特徵在於:將具有如申請專利範圍第1項至第4項中任一項所述的熱壓用鋼板的成分組成的鋼板進行760℃~840℃的熱處理後,形成附著量為10g/m2~90g/m2的Zn系鍍敷層。
- 一種熱壓構件的製造方法,其特徵在於:將如申請專利範 圍第1項至第4項中任一項所述的熱壓用鋼板加熱至Ac3變態點~1000℃的溫度範圍後進行熱壓。
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KR20140128409A (ko) | 2014-11-05 |
CN104136650B (zh) | 2017-04-19 |
US20150027596A1 (en) | 2015-01-29 |
JPWO2013132816A1 (ja) | 2015-07-30 |
US10253386B2 (en) | 2019-04-09 |
TW201348512A (zh) | 2013-12-01 |
EP2808417A4 (en) | 2015-03-25 |
EP2808417B1 (en) | 2019-04-24 |
JP5861766B2 (ja) | 2016-02-16 |
KR101678511B1 (ko) | 2016-11-22 |
EP2808417A1 (en) | 2014-12-03 |
WO2013132816A1 (ja) | 2013-09-12 |
CN104136650A (zh) | 2014-11-05 |
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