JP2019505666A - 表面品質及び低温脆性破壊抵抗性に優れた溶融亜鉛系めっき鋼板 - Google Patents
表面品質及び低温脆性破壊抵抗性に優れた溶融亜鉛系めっき鋼板 Download PDFInfo
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims abstract description 25
- 239000008397 galvanized steel Substances 0.000 title claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- 239000013078 crystal Substances 0.000 claims abstract description 9
- 238000007747 plating Methods 0.000 claims description 48
- 239000012535 impurity Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 abstract description 46
- 239000011247 coating layer Substances 0.000 abstract 1
- 238000007711 solidification Methods 0.000 description 41
- 230000008023 solidification Effects 0.000 description 41
- 239000011701 zinc Substances 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 19
- 229910019142 PO4 Inorganic materials 0.000 description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 15
- 239000010452 phosphate Substances 0.000 description 15
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 12
- 239000007864 aqueous solution Substances 0.000 description 12
- 229910052725 zinc Inorganic materials 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 10
- 238000000576 coating method Methods 0.000 description 10
- 239000010731 rolling oil Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 210000001787 dendrite Anatomy 0.000 description 5
- 238000005246 galvanizing Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000004506 ultrasonic cleaning Methods 0.000 description 2
- DEXFNLNNUZKHNO-UHFFFAOYSA-N 6-[3-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperidin-1-yl]-3-oxopropyl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1CCN(CC1)C(CCC1=CC2=C(NC(O2)=O)C=C1)=O DEXFNLNNUZKHNO-UHFFFAOYSA-N 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000011835 investigation Methods 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
- 239000002245 particle Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
- 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
- C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
-
- 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
- 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
-
- 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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- Coating With Molten Metal (AREA)
Abstract
Description
Alは鋼中Feと反応して素地鋼板と溶融亜鉛系めっき層との界面にFe−Al系合金層を形成することにより、溶融亜鉛系めっき層の密着性を向上させる役割を果たす。本発明では、かかる効果を得るために、Alを0.15重量%以上含むことが好ましい。但し、Alの含有量が0.4重量%を超えると、ドロスなどの欠陥の発生が多くなる可能性があり、Zn−Alの二元共晶組織がめっき層内に生成されて、リン酸塩処理性が不良になるおそれがある。
Mg、Ca、及びMnは、めっき層が凝固する際に、樹枝状晶の成長を抑制することにより、Zn単相組織の平均円相当直径を微細化する役割を果たす。本発明では、かかる効果を得るために、Mg、Ca、及びMnのうち1種以上を合計0.05重量%以上含むことが好ましい。但し、これらの含有量が多すぎる場合には、めっき層の表面にドロスの形で存在するようになって、めっき鋼板の表面品質を劣化させるおそれがある。そのため、これを防止するために、Mg、Ca、及びMnのうち1種以上を合計0.2重量%以下含むことが好ましい。
Beはめっき層の平滑性を向上させるとともに、めっき層の表層部に存在して、表面外観を向上させる役割を果たす。本発明では、かかる効果を得るために、Beを0.0001%以上含むことが好ましい。但し、Beの含有量が多すぎる場合には、素地鉄とめっき層との濡れ性が不良であり、不めっきが発生するおそれがあるため、本発明ではBeの上限を0.002重量%に限定する。
厚さが0.8mmの素地鋼板をアセトンに浸漬し、超音波洗浄して表面に存在する圧延油などの異物を除去した。次に、一般の溶融めっき現場で鋼板の機械的特性を確保するために行う750℃での還元雰囲気熱処理を行った。その後、毎分80mで移動する条件下で、Al:0.30重量%、Mg:0.05重量%、Ca:0.05重量%、Mn:0.05重量%、及びBe:0.002重量%を含む溶融亜鉛めっき浴に浸漬してからエアワイピングして、鋼板の両面に亜鉛を合計140g/m2となるように付着させた後、冷却してめっき層を凝固させた。このとき、すべてのサンプルを、1.5重量%のリン酸水素アンモニウム((NH4)2HPO4)水溶液の液滴を帯電噴射(液滴噴射量:70g/m2)して冷却し、圧延油の残存有無、及びリン酸塩噴射開始時点だけを変えて製造し、その結果を表1に示した。表1の圧延油の残存有無と関連し、「○」は、意図的に圧延油を残存させた場合であって、単位面積当たりに300mg/m2の圧延油が残存する場合を意味し、「X」は、素地鋼板の表面に10mg/m2未満の圧延油が残存する場合を意味する。また、下記表1のリン酸塩噴射開始時点と関連し、「凝固直前」は、エアワイピング装置を通過した鋼板の表面部エッジで凝固を開始した時点を意味し、「凝固直後」は、エアワイピング装置を通過した鋼板の表面部エッジで凝固を開始した時点から1秒経過した後を意味し、「凝固後」は、エアワイピング装置を通過した鋼板の表面温度が415℃の場合を意味する。
厚さが0.8mmの素地鋼板をアセトンに浸漬し、超音波洗浄して表面に存在する圧延油などの異物を除去した。このとき、異物を完全に除去することなく、鋼板表面に300mg/m2が残るようにした。次に、一般の溶融めっき現場で鋼板の機械的特性を確保するために行う還元雰囲気熱処理を、750℃で行った。その後、毎分80mで移動する条件下で、下記表2の組成を有する溶融亜鉛めっき浴に浸漬してからエアワイピングし、鋼板の両面に亜鉛を合計140g/m2となるように付着させた後、冷却してめっき層を凝固させた。このとき、すべてのサンプルを、リン酸水素アンモニウム((NH4)2HPO4)水溶液の液滴を帯電噴射して冷却し、エアワイピング装置を通過した鋼板の表面部エッジで、凝固を開始した時点から1秒経過した後、液滴の噴射を開始した。このとき、水溶液の濃度は1.5重量%であり、液滴の噴射量は70g/m2であった。
Claims (4)
- 素地鋼板と、前記素地鋼板上に形成された溶融亜鉛系めっき層と、を含む溶融亜鉛系めっき鋼板であって、
前記溶融亜鉛系めっき層は、微細組織として、平均円相当直径が120μm以下であるZn単相組織を含み、
前記Zn単相組織のうち{0001}面が鋼板表面に平行な結晶構造を有するZn単相組織は面積分率で70%以下である、溶融亜鉛系めっき鋼板。 - 前記溶融亜鉛系めっき層は、微細組織として、平均円相当直径が20〜100μmであるZn単相組織を含む、請求項1に記載の溶融亜鉛系めっき鋼板。
- 前記溶融亜鉛系めっき層は、重量%で、Al:0.15〜0.4%、Mg、Ca、及びMnのうち1種以上:合計0.05〜0.2%、残部Zn及び不可避不純物を含む、請求項1に記載の溶融亜鉛系めっき鋼板。
- 前記溶融亜鉛系めっき層は、重量%で、Be:0.0001〜0.002%をさらに含む、請求項3に記載の溶融亜鉛系めっき鋼板。
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KR20150184111 | 2015-12-22 | ||
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PCT/KR2016/015075 WO2017111484A1 (ko) | 2015-12-22 | 2016-12-22 | 표면 품질 및 저온 취성 파괴 저항성이 우수한 용융 아연계 도금강판 |
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KR101786377B1 (ko) | 2016-08-22 | 2017-10-18 | 주식회사 포스코 | 내골링성, 성형성 및 실러 접착성이 우수한 용융 아연도금 강판 및 그 제조방법 |
KR101819393B1 (ko) * | 2016-12-22 | 2018-01-16 | 주식회사 포스코 | 용접성 및 프레스 가공성이 우수한 용융 아연계 도금강재 및 그 제조방법 |
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WO2017111484A1 (ko) | 2017-06-29 |
KR102098515B1 (ko) | 2020-04-08 |
EP3396008B1 (en) | 2020-06-03 |
KR20180088474A (ko) | 2018-08-03 |
US11078564B2 (en) | 2021-08-03 |
JP6667640B2 (ja) | 2020-03-18 |
EP3396008A1 (en) | 2018-10-31 |
EP3396008A4 (en) | 2019-01-02 |
US20180363118A1 (en) | 2018-12-20 |
CN108431285A (zh) | 2018-08-21 |
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