JP5907324B1 - 高強度溶融亜鉛めっき鋼板 - Google Patents
高強度溶融亜鉛めっき鋼板 Download PDFInfo
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- JP5907324B1 JP5907324B1 JP2015559361A JP2015559361A JP5907324B1 JP 5907324 B1 JP5907324 B1 JP 5907324B1 JP 2015559361 A JP2015559361 A JP 2015559361A JP 2015559361 A JP2015559361 A JP 2015559361A JP 5907324 B1 JP5907324 B1 JP 5907324B1
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- less
- steel sheet
- dip galvanized
- hot
- plating
- Prior art date
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 39
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 39
- 239000010410 layer Substances 0.000 claims abstract description 58
- 239000011701 zinc Substances 0.000 claims abstract description 40
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910000765 intermetallic Inorganic materials 0.000 claims abstract description 28
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 22
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 22
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 21
- 230000003647 oxidation Effects 0.000 claims abstract description 20
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 20
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 18
- 239000002344 surface layer Substances 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 11
- 230000003746 surface roughness Effects 0.000 claims abstract description 9
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000007747 plating Methods 0.000 abstract description 72
- 229910021328 Fe2Al5 Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 60
- 239000010959 steel Substances 0.000 description 60
- 238000000576 coating method Methods 0.000 description 22
- 239000011248 coating agent Substances 0.000 description 20
- 238000000137 annealing Methods 0.000 description 14
- 239000002585 base Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 239000013078 crystal Substances 0.000 description 11
- 238000005096 rolling process Methods 0.000 description 11
- 230000007797 corrosion Effects 0.000 description 10
- 238000005260 corrosion Methods 0.000 description 10
- 239000010408 film Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000005246 galvanizing Methods 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 238000007711 solidification Methods 0.000 description 8
- 230000008023 solidification Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 229910015372 FeAl Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 3
- 229910001297 Zn alloy Inorganic materials 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 238000004070 electrodeposition Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006757 chemical reactions by type Methods 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000010731 rolling oil Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000002233 thin-film X-ray diffraction Methods 0.000 description 1
Classifications
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- B32B15/012—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 aluminium or an aluminium alloy
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/02—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
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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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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
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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
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
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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
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
-
- 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
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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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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Abstract
Description
[1]質量%で、C:0.06%以上0.09%以下、Si:0.30%以下、Mn:1.7%以上2.3%以下、P:0.001%以上0.020%以下、S:0.010%以下、Mo:0.05%以上0.30%以下、N:0.005%以下及びAl:0.01%以上0.10%以下を含有し、残部がFe及び不可避不純物の組成からなり、マルテンサイト面積率が7%以上25%未満、フェライト面積率が50%以上の組織を有し、地鉄表層部の内部酸化量が片面当たり0.05g/m2以下である冷延鋼板と、
該冷延鋼板上に形成された0.03g/m2以上0.12g/m2以下のAlを含み、かつ平均粒径1μm未満のFe2Al5を含む金属間化合物と、
該金属間化合物上に形成され、0.15%≦Al%≦0.30%(Al%は、溶融亜鉛めっき層のAlの含有量(質量%)を示す。)を含有し、表面粗さRaが0.8μm以上1.6μm以下であり、光沢度(G値)が750以上850以下であり、以下の式(1)で規定される亜鉛基底面配向率Zn(002)/(004)が30%以上60%以下である溶融亜鉛めっき層と、を有することを特徴とする高強度溶融亜鉛めっき鋼板。
本発明の高強度溶融亜鉛めっき鋼板を構成する冷延鋼板は、C:0.06%以上0.09%以下、Si:0.30%以下、Mn:1.7%以上2.3%以下、P:0.001%以上0.020%以下、S:0.010%以下、Mo:0.05%以上0.30%以下、N:0.005%以下、Al:0.01%以上0.10%以下を含有し、残部がFe及び不可避不純物の組成からなる。ここでは、まず、この冷延鋼板の成分限定理由について説明する。なお、本発明の鋼板中の各成分の「%」は、特に説明のない限り、「質量%」を示す。
Cは鋼の重要な基本成分の一つであり、とくに本発明では、(α(フェライト)+γ(オーステナイト))域に加熱したときのオーステナイト(γ)相の体積率、ひいては変態後のマルテンサイトの量に影響するために重要な元素である。そして、強度などの機械的特性は、このマルテンサイト分率とマルテンサイト相の硬度によって大きく左右される。C含有量が、0.06%未満ではマルテンサイト相が生成しにくく、一方、0.09%超ではスポット溶接性が劣化することから、C含有量は、0.06%以上0.09%以下とする。
Siはフェライト(α)相中の固溶C量を減少させることにより、伸びなどの加工性を向上させる元素であるが、0.30%超のSi量の含有はスポット溶接性およびめっき品質を損ねるので、Si含有量は上限を0.30%とする。
Mnは、本発明においてはオーステナイト(γ)相に濃化し、マルテンサイト変態を促す効果があり、基本成分として重要な元素である。ただし、Mn含有量が1.7%未満ではその効果がなく、一方、2.3%を超えるとスポット溶接性およびめっき品質を著しく損なうので、Mn含有量は1.7%以上2.3%以下とする。
Pは、高強度化を安価に達成するうえで有効な元素であり、高強度化を実現するために、P含有量は、0.001%以上とする。一方、Pを0.020%超えて含有するとスポット溶接性を著しく損なうので上限を0.020%とする。
Sは熱延時の熱間割れを引き起こすもとになるほか、スポット溶接部のナゲット内破断を誘発するので、極力低減することが望ましい。よって、本発明では、S含有量は0.010%以下に抑制する。
Moはめっき品質を損なうことなく、フェライト+マルテンサイトの複合組織を得るのに重要な元素であり、少なくともMo含有量を0.05%とすることは必要である。しかし、0.30%を超えてMoを含有しても、さらなる効果が少なく、製造コストの上昇を招くので0.30%を上限とする。
Nは時効劣化をもたらすほか、降伏点(降伏比)の上昇、降伏伸びの発生を招くことから、N含有量は0.005%以下に抑制する必要がある。
Alは製鋼工程での脱酸剤として、また時効劣化を引き起こすNをAlNとして固定する有効な元素であり、その効果を十分に発揮するためにも、Al含有量は、0.01%以上とする。一方、0.10%を超えてAlを含有すると製造コストの上昇を招くので、Al含有量は0.10%以下に抑える必要がある。
本発明の高強度溶融亜鉛めっき鋼板を構成する冷延鋼板では、マルテンサイトの面積率が7%未満になると、降伏比YRが顕著に上昇する。一方、マルテンサイトの面積率が25%以上になると、局部延性が低下するために全伸びELが低下する。したがって、本発明の高強度溶融亜鉛めっき鋼板を構成する冷延鋼板では、マルテンサイトの面積率は、7%以上25%未満とする。このマルテンサイトの面積率は、好ましくは7%以上22%以下、より好ましくは7%以上20%以下である。マルテンサイトの面積率は、主に鋼中のC含有量を0.06%以上0.09%以下に制御することと共に、焼鈍の際の加熱温度(焼鈍温度であり、鋼板最高到達温度を意味する。)を730℃以上880℃以下に設定することで調整することができる。
本発明の高強度溶融亜鉛めっき鋼板を構成する冷延鋼板では、フェライトの面積率が50%未満になると、全伸びELの低下が顕著になる。したがって、フェライトの面積率は、50%以上とする。このフェライトの面積率は、好ましくは60%以上である。フェライトの面積率は、主に鋼中のC含有量を0.06%以上0.09%以下に制御することで調整することができる。
鋼板表層部(地鉄表層部)における内部酸化の状態を制御することで、高強度溶融亜鉛めっき鋼板における加工部の耐衝撃性試験時のめっき密着性と塗装後耐食性を優れたものとすることができると共に、スポット溶接性も優れたものとすることができる。良好なめっき密着性の確保のためには、冷延鋼板の表面における地鉄表層部の内部酸化量が片面当たり0.05g/m2以下であることが必要である。
次に、前述した冷延鋼板上に形成される金属間化合物の構成について説明する。
本発明の高強度溶融亜鉛めっき鋼板は、めっき層と鋼板との界面に金属間化合物を含有することで、加工部の耐衝撃性試験時の密着性を向上させることができる。この金属間化合物は、0.03g/m2以上0.12g/m2以下のAlを有し、かつ平均粒径0.7μm未満のFe2Al5を含有する。これにより、本発明の高強度溶融亜鉛めっき鋼板では、FeAl金属間化合物をめっき層と鋼板の界面に微細かつ緻密な性状で形成させることができる。
Fe2Al5の平均粒径が0.7μm以上の場合は硬質のFeAl金属間化合物が過剰成長しているため、本発明の高強度溶融亜鉛めっき鋼板のめっき外観性の確保が難しくなる。一方、Fe2Al5の平均粒径が0.7μm未満であれば、めっき層と鋼板の界面のFeAl金属間化合物の生成が抑制されるため、スポット溶接性は向上する。そのため、平均粒径は0.7μm未満にする。
次に、冷延鋼板の表面に溶融亜鉛めっき処理を行うことによって形成され、前述した金属間化合物上に形成される溶融亜鉛めっき層の構成について説明する。
本発明の高強度溶融亜鉛めっき鋼板を構成する溶融亜鉛めっき層は、Znおよび0.15%≦Al%≦0.30%を含有する。ここで、Al%は、溶融亜鉛めっき層のAlの含有量(質量%)を示す。Alが0.15%未満であるようにするためには、めっきの溶融亜鉛浴中のAl濃度を低くする必要があり、このAl濃度が低過ぎると、Feの溶出があるため、ドロスが析出して外観性が劣化する。Alが0.30%超えであるとめっき層表面にAlの酸化皮膜が多量に形成されてスポット溶接性が劣化する。また、溶融亜鉛めっき層は、Pb、Sb、Mg、Ni、Mn、Si、Ti、Cr、Sr、Caを含有することもできる。
溶融亜鉛めっき層表面の表面粗さRaが0.8μm未満であると、プレス時に油が保持されずに加工時のプレス成形性が劣る。一方、Raが1.6μm超えであると、塗装後鮮映性や密着性が劣る。そのため、Raは、0.8μm以上1.6μm以下とする。
本発明の高強度溶融亜鉛めっき鋼板では、めっきの凝固組織を制御するために、まず、光沢度(G値)を750以上850以下とし、以下の式(1)で規定される亜鉛基底面配向率Zn(002)/(004)を30%以上60%以下とする。これにより、hcp(hexagonal close−packed:六方最密充填構造)の亜鉛を凝固する際に基底面に配向し易くすることができる。
本発明の高強度溶融亜鉛めっき鋼板では、引張強度(TS)は主に内板の強度を確保するため、590MPa以上690MPa以下とする。このような引張強度(TS)が590MPa以上690MPa以下の高強度溶融亜鉛めっき鋼板は、本発明での鋼板成分の材料について適正な焼鈍条件でCGL通板することで得ることが出来る。焼鈍温度としては、2相域での焼鈍が必要であるため、800〜850℃程度の温度とすることが好ましい。
自動車のサイドメンバーなどの加工部が自動車の衝突時の衝撃による加工を模擬するため、90°曲げした部分を対象とする。この部分をいわゆるデュポン試験器で耐衝撃性を調査し、テープ剥離して評価する。塗装後耐食性はこの曲げた部分を化成処理・電着塗装を実施し、クロスカットを施しSST試験で膨れ腐食幅で評価する。上述のように界面のFe−Al金属間化合物の量が必要以上に確保出来ていれば、良好なめっき密着性(耐衝撃密着性)を確保出来る。
続いて、高強度溶融亜鉛めっき鋼板の製造方法について説明する。例えば、以下の方法で高強度溶融亜鉛めっき鋼板を製造可能である。先ず、上記のような成分組成を有する鋼を連続鋳造によりスラブとし、該スラブを加熱し、スケール除去および粗圧延を施す。次いで、冷却した後、仕上げ圧延し、冷却し、巻取り、次いで、酸洗、冷間圧延を行う。次いで、連続式溶融亜鉛めっき設備において、鋼板の焼鈍および溶融亜鉛めっき処理を行う。
×:密着不良
不良(×):膨れ有り
Claims (1)
- 質量%で、C:0.06%以上0.09%以下、Si:0.30%以下、Mn:1.7%以上2.3%以下、P:0.001%以上0.020%以下、S:0.010%以下、Mo:0.05%以上0.30%以下、N:0.005%以下、Al:0.01%以上0.10%以下を含有し、残部がFe及び不可避不純物の組成からなり、
マルテンサイト面積率が7%以上25%未満、フェライト面積率が50%以上の組織を有し、
地鉄表層部の内部酸化量が片面当たり0.05g/m2以下である冷延鋼板と、
該冷延鋼板上に形成され、0.03g/m2以上0.12g/m2以下のAlを含み、かつ平均粒径0.7μm未満のFe2Al5を含む金属間化合物と、
該金属間化合物上に形成され、
0.15%≦Al%≦0.30%(Al%は、溶融亜鉛めっき層のAlの含有量(質量%)を示す。)を含有し、
表面粗さRaが0.8μm以上1.6μm以下であり、
光沢度(G値)が750以上850以下であり、
以下の式(1)で規定される亜鉛基底面配向率Zn(002)/(004)が30%以上60%以下である溶融亜鉛めっき層と、
を有する高強度溶融亜鉛めっき鋼板。
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