JP4523937B2 - 高強度溶融亜鉛系めっき鋼板及びその製造方法 - Google Patents
高強度溶融亜鉛系めっき鋼板及びその製造方法 Download PDFInfo
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 34
- 239000008397 galvanized steel Substances 0.000 title claims description 34
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 143
- 239000010959 steel Substances 0.000 claims description 143
- 229910052710 silicon Inorganic materials 0.000 claims description 44
- 239000010410 layer Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 36
- 238000005246 galvanizing Methods 0.000 claims description 27
- 229910052739 hydrogen Inorganic materials 0.000 claims description 23
- 229910052748 manganese Inorganic materials 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 20
- 239000001257 hydrogen Substances 0.000 claims description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 18
- 239000001301 oxygen Substances 0.000 claims description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 17
- 239000002344 surface layer Substances 0.000 claims description 16
- 230000003647 oxidation Effects 0.000 claims description 12
- 238000007254 oxidation reaction Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 230000014509 gene expression Effects 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000007747 plating Methods 0.000 description 159
- 229910001566 austenite Inorganic materials 0.000 description 57
- 229910052782 aluminium Inorganic materials 0.000 description 40
- 238000000137 annealing Methods 0.000 description 32
- 238000001816 cooling Methods 0.000 description 24
- 230000009466 transformation Effects 0.000 description 23
- 230000000717 retained effect Effects 0.000 description 19
- 238000010438 heat treatment Methods 0.000 description 18
- 229910001563 bainite Inorganic materials 0.000 description 15
- 230000000694 effects Effects 0.000 description 14
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 13
- 229910052759 nickel Inorganic materials 0.000 description 13
- 229910052725 zinc Inorganic materials 0.000 description 13
- 239000011701 zinc Substances 0.000 description 13
- 238000011156 evaluation Methods 0.000 description 12
- 238000005275 alloying Methods 0.000 description 11
- 229910052802 copper Inorganic materials 0.000 description 10
- 238000007654 immersion Methods 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 229910001567 cementite Inorganic materials 0.000 description 8
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 8
- 229910052718 tin Inorganic materials 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000011282 treatment Methods 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 238000007598 dipping method Methods 0.000 description 6
- 229910000734 martensite Inorganic materials 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- 239000010960 cold rolled steel Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000005098 hot rolling Methods 0.000 description 5
- 238000011835 investigation Methods 0.000 description 5
- 229910001562 pearlite Inorganic materials 0.000 description 5
- 238000009864 tensile test Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 150000001247 metal acetylides Chemical class 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000001934 delay Effects 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000013585 weight reducing agent Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- -1 Si and Al Chemical compound 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C21D8/0273—Final recrystallisation annealing
-
- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
-
- 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
- C23C2/0224—Two or more thermal pretreatments
-
- 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
- C23C2/34—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
- 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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
-
- 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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- 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
- Y10T29/00—Metal working
- Y10T29/30—Foil or other thin sheet-metal making or treating
- Y10T29/301—Method
-
- 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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- 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
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12951—Fe-base component
Description
C:0.03〜0.25%、
Si:0.05〜2.0%、
Mn:0.5〜2.5%、
P:0.03%以下、
S:0.02%以下、
Al:0.01〜2.0%、
Ni:0.01〜2.0%、
を含有し、Si,Mn,Alの関係が
Si+Al+Mn≧1.0%
を満たし、残部がFe及び不可避的不純物からなる鋼板表面に溶融亜鉛めっき層が形成されたものであって、発煙硝酸による溶融亜鉛めっき層の溶解後に走査電子顕微鏡で鋼板表面を観察したときに、鋼板表面の5%以上80%以下が酸化物であることを特徴とする高強度溶融亜鉛めっき鋼板。
Mo:0.01〜0.5%、
Cu:0.01〜1.0%、
Sn:0.01〜0.10%、
の内1種類以上を含有することを特徴とする(1)に記載の高強度溶融亜鉛めっき鋼板。
O≦30ppm、
20×exp(0.1×D)≦H≦2000×exp(0.1×D)、
の関係式を満たす処理を施すことを特徴とする高強度溶融亜鉛めっき鋼板の製造方法。
O≦30ppm
20×exp(1.0×D)≦H≦2000×exp(0.1×D)
の関係式を満たすようにすることが望ましい。
3×exp{0.1×(D+20×(1−Ni(%))}≦H
≦2000×exp{0.1×(D+20×(1−Ni(%))}
の関係式を満たすようにすることが望ましい。これは、めっき前に生成する鋼板表面の酸化物生成に鋼中Ni含有量、温度、時間、雰囲気の影響があるためである。温度を高く、高温での時間を長くすることで酸化物の生成が促進され鋼板表面に酸化物が生成できるようになる。また、雰囲気中の水素濃度が低く、露点が高くなると内部酸化が促進される。さらに、上述したように鋼中にNiを入れることで容易に内部酸化をさせることが出来るようになる。本発明者らが、詳細に調査した結果、上式の関係を満たすような雰囲気で焼鈍させることで内部酸化を形成することを見出した。ここで、望ましくは水素濃度が「800×exp{0.1×(D+20×(1−Ni(%))}」以下にすることで、より容易に内部酸化を得ることが出来る。
表1に示す各種鋼板を用い、溶融めっきシミュレータを用いて、昇温速度5℃/s、800℃×100sの焼鈍を水素8%、露点−30℃の雰囲気で行った後に、引き続き溶融亜鉛めっき浴に浸漬して室温まで空冷して各種溶融亜鉛めっきを得た。ここで、溶融亜鉛めっき浴の組成は亜鉛に0.14%のAlを含有させたものを用いた。また、浸漬時間は4s、浸漬温度は460℃とした。
表2に成分を示した鋼を表3に記載した条件で熱延、冷延、焼鈍、めっきを行い、その後0.6%で調質圧延することで鋼板を製造した。製造した鋼板は、下記に示す「引っ張り試験」「残留オーステナイト測定試験」「溶接試験」「めっき外観」「めっき性」の試験を行った。また、合金化溶融亜鉛めっき鋼板を製造した際には「めっき層中Fe濃度測定」を行った。また、めっき付着量は片面40g/m2になるようにした。
テープテスト黒化度(%)
評価:◎ … 0〜10
評価:○ … 10〜20未満
評価:△ … 20〜30未満
評価:× … 30以上
(◎と○が合格、△・×は不合格)
表1の条件2の成分の冷延鋼板を使い、溶融めっきシミュレータを用いて、昇温速度5℃/s、800℃×100sの焼鈍を表8に示す雰囲気で行った後に、引き続き溶融亜鉛めっき浴に浸漬して室温まで空冷して各種溶融亜鉛めっきを得た。ここで、昇温時の水素濃度は4%、露点は−40℃とし、溶融亜鉛めっき浴の組成は亜鉛に0.14%のAlを含有させたものを用いた。また、浸漬時間は4s、浸漬温度は460℃とした。
表1の条件5の成分の冷延鋼板を使い、溶融めっきシミュレータを用いて、昇温速度5℃/s、800℃×100sの焼鈍を表8に示す雰囲気で行った後に、引き続き溶融亜鉛めっき浴に浸漬して室温まで空冷して各種溶融亜鉛めっきを得た。ここで、溶融亜鉛めっき浴の組成は亜鉛に0.14%のAlを含有させたものを用いた。また、浸漬時間は4s、浸漬温度は460℃とした。
表9に示す各種鋼板を用い、溶融めっきシミュレータを用いて、昇温速度5℃/s、800℃×100sの焼鈍を酸素5ppm、水素4%、露点−40℃の雰囲気で行った後に、引き続き溶融亜鉛めっき浴に浸漬して室温まで空冷して各種溶融亜鉛めっきを得た。ここで、昇温時の雰囲気は800℃保持時と同じ酸素5ppm、水素4%、露点−40℃とし、溶融亜鉛めっき浴の組成は亜鉛に0.14%のAlを含有させたものを用いた。また、浸漬時間は4s、浸漬温度は460℃とした。
表10に示す各種鋼板を用い、溶融めっきシミュレータを用いて、昇温速度5℃/s、800℃×100sの焼鈍を水素4%、露点−30℃の雰囲気で行った後に、引き続き溶融亜鉛めっき浴に浸漬して室温まで空冷して各種溶融亜鉛めっきを得た。ここで、溶融亜鉛めっき浴の組成は亜鉛に0.14%のAlを含有させたものを用いた。また、浸漬時間は4s、浸漬温度は460℃とした。
Claims (7)
- 重量%で
C:0.03〜0.25%、
Si:0.05〜2.0%、
Mn:0.5〜2.5%、
P:0.03%以下、
S:0.02%以下、
Al:0.01〜2.0%、
Ni:0.01〜2.0%、
を含有し、Si,Mn,Alの関係が
Si+Al+Mn≧1.0%
を満たし、残部がFe及び不可避的不純物からなる鋼板表面に溶融亜鉛めっき層が形成されたものであって、発煙硝酸による溶融亜鉛めっき層の溶解後に走査電子顕微鏡で鋼板表面を観察したときに、鋼板表面の5%以上80%以下が酸化物であることを特徴とする高強度溶融亜鉛めっき鋼板。 - 鋼板表面の酸化物において、酸化物中のSi,Mn,Alの1種類以上を含むことを特徴とする請求項1に記載の高強度溶融亜鉛めっき鋼板。
- 重量%で、更に
Mo:0.01〜0.5%、
Cu:0.01〜1.0%、
Sn:0.01〜0.10%、
の内1種類以上を含有することを特徴とする請求項1に記載の高強度溶融亜鉛めっき鋼板。 - 請求項1に記載の成分組成を満足する鋼板を、溶融亜鉛めっきを施す前に、400℃以上750℃の間の酸素濃度O(ppm)がO≦50ppmであって、かつ750℃以上で30秒以上の間を雰囲気の水素濃度をH(%)、露点をD(℃)、酸素濃度をO(ppm)としたときに、H,D,Oが、
O≦30ppm、
20×exp(0.1×D)≦H≦2000×exp(0.1×D)、
の関係式を満たす処理を施すことを特徴とする高強度溶融亜鉛めっき鋼板の製造方法。 - 請求項1に記載の鋼板で、鋼板表面に溶融亜鉛めっき層が形成されたものであって、上記めっき鋼板の断面観察をSEMにて行ったときに、溶融亜鉛めっき直下の母材表層が内部酸化していることを特徴とする高強度溶融亜鉛めっき鋼板。
- 前記鋼板がさらに加熱合金化されていることを特徴とする請求項1に記載の高強度溶融亜鉛めっき鋼板。
- 請求項1に記載の鋼板で、鋼板表面に溶融亜鉛めっき層が形成されたものであって、上記めっき鋼板の断面観察をSEMにて行ったときに溶融亜鉛めっき直下の母材表層に観察される酸化物の最大長さが3μm以下でそれぞれの酸化物の間に隙間を有することを特徴とする高強度溶融亜鉛めっき鋼板。
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JP2006517257A (ja) | 2006-07-20 |
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CA2513298C (en) | 2012-01-03 |
US7736449B2 (en) | 2010-06-15 |
CN1985016A (zh) | 2007-06-20 |
WO2004063410A1 (en) | 2004-07-29 |
ES2633914T3 (es) | 2017-09-26 |
CN1985016B (zh) | 2011-09-14 |
US20060124907A1 (en) | 2006-06-15 |
KR20050092113A (ko) | 2005-09-20 |
US20080053576A1 (en) | 2008-03-06 |
EP1587966B1 (en) | 2017-05-17 |
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