JP5907055B2 - 溶融亜鉛めっき鋼板 - Google Patents
溶融亜鉛めっき鋼板 Download PDFInfo
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- JP5907055B2 JP5907055B2 JP2012273010A JP2012273010A JP5907055B2 JP 5907055 B2 JP5907055 B2 JP 5907055B2 JP 2012273010 A JP2012273010 A JP 2012273010A JP 2012273010 A JP2012273010 A JP 2012273010A JP 5907055 B2 JP5907055 B2 JP 5907055B2
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- dip galvanized
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- steel sheet
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 44
- 239000008397 galvanized steel Substances 0.000 title claims description 44
- 239000010410 layer Substances 0.000 claims description 65
- 229910000831 Steel Inorganic materials 0.000 claims description 56
- 239000010959 steel Substances 0.000 claims description 56
- 239000011701 zinc Substances 0.000 claims description 42
- 239000013078 crystal Substances 0.000 claims description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 29
- 229910000765 intermetallic Inorganic materials 0.000 claims description 21
- 229910052725 zinc Inorganic materials 0.000 claims description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 17
- 230000003647 oxidation Effects 0.000 claims description 14
- 238000007254 oxidation reaction Methods 0.000 claims description 14
- 239000002344 surface layer Substances 0.000 claims description 13
- 230000003746 surface roughness Effects 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 238000007747 plating Methods 0.000 description 55
- 238000000576 coating method Methods 0.000 description 32
- 239000011248 coating agent Substances 0.000 description 30
- 238000000034 method Methods 0.000 description 17
- 230000007797 corrosion Effects 0.000 description 14
- 238000005260 corrosion Methods 0.000 description 14
- 238000005096 rolling process Methods 0.000 description 13
- 239000002585 base Substances 0.000 description 12
- 238000000137 annealing Methods 0.000 description 10
- 238000005246 galvanizing Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000011156 evaluation Methods 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
- 239000000463 material Substances 0.000 description 4
- 238000010422 painting Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910000905 alloy phase Inorganic materials 0.000 description 3
- 238000004070 electrodeposition Methods 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910015372 FeAl Inorganic materials 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 2
- 239000004566 building material 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
- 239000007789 gas Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 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
- 238000009749 continuous casting Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 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
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 229910000859 α-Fe 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
- 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
-
- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- 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
- C23C2/02—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
- C23C2/34—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
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
- C23C28/321—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer with at least one metal alloy layer
-
- 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
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Description
本発明で用いる鋼板は、質量%で、C:0.05%以上0.1%以下、Si:0.10%以下、Mn:0.30%以上0.70%以下、P:0.040%以下、S:0.010%以下、N:0.005%以下、Al:0.10%以下を含有し、残部がFe及び不可避的不純物の組成からなる。以下、上記成分組成について説明する。なお、本明細書において、成分組成における「%」表示は、特に断らない限り「質量%」を意味する。
Cの含有量が増えると鋼板の高強度化に寄与できる。この高強度化のためにはCは0.05%以上とする必要がある。一方、多量のCは固溶Cの増大を招き、降伏強度、伸びを大きく上昇させるとともに、溶接性も大きく低下させることからCの含有量は0.10%以下とする必要がある。
Siは、多量に添加すると、焼鈍時のSi酸化物の生成により、プレス加工後の鋼板のめっき密着性が阻害されてしまう。したがって、Siは0.10%以下とする必要がある。好ましいSiの含有量は0.03%以下である。
Mnは固溶強化により高強度化に寄与するだけでなく、Cの拡散を抑制し、セメンタイトを微細化することで固溶Cを低減し、降伏強度、伸びを小さくすることができる。さらには有害な鋼中のSをMnSとして無害化する作用も有する。このような効果を得るためMnの含有量は0.30%以上とする必要がある。一方、多量のMnの含有は、硬質化による延性の低下を招くだけでなく、焼鈍時にMn酸化物の生成を引き起こし、プレス加工後の鋼板のめっき密着性を阻害する。そのため、Mnの含有量は0.70%以下とする必要がる。
Pは固溶強化元素として高強度化に寄与するが、延性や靭性を劣化させることから、0.040%以下とする必要がある。好ましいPの含有量は0.015%以下である。
Sの含有量が多いと、溶接部の靭性が劣化する。このためSの含有量の上限は0.010%とする。好ましいSの含有量は0.007%以下である。
Al(sol.Al)とNは、通常の鋼板が含有する量であれば本発明の効果を損なわない。また、Nは、Tiと結合してTiNを形成したり、Alと結合してAlNを形成したりする。そこで、Alの含有量を0.10%以下、Nの含有量を0.005%以下に規定する。なお、Alの含有量が0.10%を超えると、後述する金属間化合物の形成を阻害したり、核発生を抑制して鋼板組織中の1つ1つの結晶が粗大化することでプレス加工後のめっき密着性を劣化させたりする。また、Nの含有量が0.005%を超える窒化物がフェライト粒内に分散して加工硬化率が低下する。好ましいAlの含有量は0.04%以下であり、好ましいNの含有量は0.002%以下である。
溶融亜鉛めっき層とは、通常の溶融亜鉛めっき処理によって形成される溶融亜鉛めっき層のことである。また、溶融亜鉛めっき層は、Alを0.3%以上0.6%以下含む。本発明においては、溶融亜鉛めっき層にZn、Al以外の成分を、本発明の効果を害さない範囲で含んでもよく、Al以外の成分としてはFe、Mg、Cr等が挙げられる。
上記のようにして亜鉛基底面配向率を規定すれば、Znはhcp構造をとり通常は基底面に配向し易いが、どの程度結晶がランダムに配向したかが分かる。この凝固組織の配向程度によって光沢、結晶サイズ、表面での粗度(表面粗さ)が影響されるため、亜鉛基底配向率を正確に制御することは溶融亜鉛めっき鋼板の表面性状だけでなくプレス加工性を制御する際に重要である。
金属間化合物は、平均粒径1μm以下のFe2Al5を含む金属間化合物から構成され、鋼板と溶融亜鉛めっき層間に存在する。また、金属間化合物は、0.12g/m2以上0.22g/m2以下のAlを含む。Fe2Al5を含む金属間化合物が存在することでFeZn合金相の形成を抑制して良好なめっき密着性が確保できるという効果が得られる。この効果はFe2Al5を含む金属間化合物以外の場合、硬質で脆い場合が多いため得られない。これら以外では、硬くて脆いFeZn金属間化合物が生成する場合があり、この場合めっき密着性が劣化する。また、Fe2Al5の含有量は本発明の効果が得られるように適宜調整すればよい。なお、金属間化合物が存在していることの確認は、溶融亜鉛めっき層の断面における鋼板との界面付近を透過電子顕微鏡中で電子線回折によって解析して検出する方法で行うことができる。
本発明の溶融亜鉛めっき鋼板はプレス加工後のめっき密着性、プレス加工後における加工部の塗装後耐食性に優れ、且つ優れた塗装後外観を有する。このため、本発明の溶融亜鉛めっき鋼板は、バックドアやフードなどの非常に厳しい加工部位を有する製品にも適用可能である。
続いて、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。
Claims (2)
- 質量%で、C:0.05%以上0.10%以下、Si:0.10%以下、Mn:0.30%以上0.70%以下、P:0.040%以下、S:0.010%以下、N:0.005%以下、Al:0.10%以下を含有し、残部がFe及び不可避的不純物の組成からなる鋼板と、
前記鋼板の表面の少なくとも一部に形成された、Alを0.3%以上0.6%以下含む溶融亜鉛めっき層と、
前記鋼板と前記溶融亜鉛めっき層間に存在する、0.12g/m2以上0.22g/m2以下のAlを含み、かつ平均粒径1μm以下のFe2Al5を含む金属間化合物と、を有し、
降伏応力(YS)が260MPa以上350MPa以下であるプレス加工用溶融亜鉛めっき鋼板。 - 前記溶融亜鉛めっき層の表面の表面粗さRaが0.8μm以上1.6μm以下であり、
前記溶融亜鉛めっき層の表面の光沢度(G値)が550以上750以下であり、
前記溶融亜鉛めっき層の表面における、Zn結晶の(002)面の結晶配向性とZn結晶の(004)面の結晶配向性との比である亜鉛基底面配向率(Zn(002)/(004))が0.60以上0.90以下であり、
前記鋼板の表面における、前記溶融亜鉛めっき層と接触する地鉄表層部の内部酸化量が0.05g/m2以下であることを特徴とする請求項1に記載のプレス加工用溶融亜鉛めっき鋼板。
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