JP6168144B2 - 亜鉛めっき鋼板及びその製造方法 - Google Patents
亜鉛めっき鋼板及びその製造方法 Download PDFInfo
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- JP6168144B2 JP6168144B2 JP2015514837A JP2015514837A JP6168144B2 JP 6168144 B2 JP6168144 B2 JP 6168144B2 JP 2015514837 A JP2015514837 A JP 2015514837A JP 2015514837 A JP2015514837 A JP 2015514837A JP 6168144 B2 JP6168144 B2 JP 6168144B2
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- steel sheet
- galvanized
- galvanized steel
- plating
- Prior art date
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- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 129
- 239000008397 galvanized steel Substances 0.000 title claims description 129
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 138
- 239000010959 steel Substances 0.000 claims description 138
- 238000007747 plating Methods 0.000 claims description 81
- 238000005246 galvanizing Methods 0.000 claims description 75
- 238000010438 heat treatment Methods 0.000 claims description 46
- 238000005275 alloying Methods 0.000 claims description 39
- 230000005484 gravity Effects 0.000 claims description 33
- 239000000203 mixture Substances 0.000 claims description 27
- 239000000126 substance Substances 0.000 claims description 26
- 239000012535 impurity Substances 0.000 claims description 21
- 239000011701 zinc Substances 0.000 claims description 20
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 9
- 229910052725 zinc Inorganic materials 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 26
- 239000010960 cold rolled steel Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 19
- 238000000137 annealing Methods 0.000 description 16
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- 229910052759 nickel Inorganic materials 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
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- 239000000463 material Substances 0.000 description 6
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- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 229910052749 magnesium Inorganic materials 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 229910052726 zirconium Inorganic materials 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
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- 238000001953 recrystallisation Methods 0.000 description 3
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- 230000008023 solidification Effects 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
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- 239000003507 refrigerant Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Images
Classifications
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- 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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
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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
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
- C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
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- C21—METALLURGY OF IRON
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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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
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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
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- 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
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Description
本願は、2013年5月1日に、日本に出願された特願2013−96427号に基づき優先権を主張し、その内容をここに援用する。
本発明の要旨は、以下の通りである。
TS×λ≧30000MPa・%・・・・・・(1)
(2)上記(1)に記載の亜鉛めっき性及び穴拡げ性に優れた亜鉛めっき鋼板において、前記亜鉛めっき層が、前記化学成分として、質量%で、Fe:0.01%以上、7%未満を含有する溶融亜鉛めっき層でもよい。
(3)上記(1)に記載の亜鉛めっき性及び穴拡げ性に優れた亜鉛めっき鋼板において、前記亜鉛めっき層が、前記化学成分として、質量%で、Fe:7%以上、15%以下を含有する合金化溶融亜鉛めっき層でもよい。
(4)上記(1)〜(3)の何れか1項に記載の亜鉛めっき性及び穴拡げ性に優れた亜鉛めっき鋼板は、前記鋼板のMn含有量が、質量%で、0.20%超、0.50%以下であってもよい。
(6)上記(5)に記載の亜鉛めっき鋼板の製造方法では、前記溶融亜鉛めっき処理を行った後に、さらに、470℃〜560℃の加熱温度で、かつ10秒〜40秒の加熱時間で、合金化加熱処理を行ってもよい。
Cは、鋳造時の凝固組織を微細な等軸晶組織とするために必須の元素である。そのため、C含有量は0.100%超とする。一方、C含有量が0.500%を超えると、亜鉛めっき鋼板の靭性やアーク溶接性が劣化する。したがって、C含有量は、0.100%超、0.500%以下とする。
Tiは、鋳造時の凝固組織を微細な等軸晶組織とするために必須の元素である。そのため、Ti含有量は0.100%超とする。一方、Ti含有量が1.000%を超えると、亜鉛めっき鋼板の靭性が劣化する。したがって、Ti含有量は、0.100%超、1.000%以下とする。また、Niプレめっきを好適な状態とするためには、Ti含有量を0.300%以上とする方が良い。その理由は、Tiが、Niプレめっき処理において、Niの拡散を抑える働きをするからである。そのため、Ti含有量の下限は、0.300%が好ましく、より好ましくは0.310%、さらに好ましくは0.320%である。
なお、鋳造時の凝固組織を微細な等軸晶組織とするために、C含有量とTi含有量との和、即ち、C+Tiを、0.200%超、1.500%以下とする。また、Niプレめっきを好適な状態とするためには、C+Tiは0.300%以上が好ましく、より好ましくは0.400%以上、さらに好ましくは0.500%以上である。C+Tiの上限は、好ましくは1.300%であり、より好ましくは1.200%であり、更に好ましくは1.000%である。
Alは、亜鉛めっき鋼板の低比重化を達成するための必須の元素である。Al含有量が3.0%未満では、低比重化の効果が不十分であり、比重を7.5未満とすることができない。一方、Al含有量が10.0%を超えると、金属間化合物の析出が顕著となり延性、加工性及び靭性が劣化する。したがって、Al含有量は、3.0%以上、10.0%以下とする。より良好な延性を得るためには、Al含有量の上限を6.0%とすることが好ましい。
Siは、一般的に亜鉛めっき鋼板の亜鉛めっき性を低下させる。また、亜鉛めっき鋼板の靭性を劣化させる元素であり、亜鉛めっき鋼板のSi含有量を低減させる必要がある。そのため、Si含有量の上限は0.20%未満とする。一方、Si含有量の下限は、現状の精錬技術と製造コストを考慮し、0.0001%とする。
なお、Al含有量とSi含有量との積、即ち、Al×Siを、0.8以下とすることにより、極めて良好な靭性を得ることができる。Al×Siは、可能な限り低くすることが望ましく、下限は規定しないが、精錬技術と製造コストを考慮し、0.03とすることが好ましい。
Mnは、MnSを形成して固溶Sによる粒界脆化を抑制するために有効な元素である。しかし、Mn含有量が0.20%以下では、その効果が発現されない。また、Mn含有量が3.00%を超えると、亜鉛めっき鋼板の靭性が劣化する。したがって、Mn含有量は0.20%超、3.00%以下とする。
Pは、粒界に偏析して粒界強度を低下させ、亜鉛めっき鋼板の靱性を劣化させる不純物元素であり、亜鉛めっき鋼板中のP含有量を低減させることが望ましい。そのため、P含有量の上限を0.0200%とする。また、P含有量の下限は、現状の精錬技術と製造コストを考慮し、0.00001%とする。
Sは、亜鉛めっき鋼板の熱間加工性及び靭性を劣化させる不純物元素であり、亜鉛めっき鋼板中のS含有量を低減させることが望ましい。そのため、S含有量の上限を0.0100%とする。また、S含有量の下限は、現状の精錬技術と製造コストを考慮し、0.00001%とする。
Nは、Tiと窒化物及び/又は炭窒化物、即ち、TiN及びTi(C、N)を形成して、凝固組織を微細な等軸晶組織とするために必須の元素である。この効果は、N含有量が0.0030%未満では発現されない。また、N含有量が0.0100%を超えると、粗大なTiNの生成により亜鉛めっき鋼板の靭性が劣化する。したがって、N含有量は0.0030%以上、0.0100%以下とする。
Nbは、微細な炭窒化物を形成する元素であり、結晶粒の粗大化の抑制に有効である。亜鉛めっき鋼板の靭性を高めるには、0.005%以上のNbを添加することが好ましい。しかし、Nbを過剰に添加すると析出物が粗大になり、亜鉛めっき鋼板の靭性が劣化することがある。したがって、Nb含有量は、0.300%以下とすることが好ましい。
Vは、Nbと同様、微細な炭窒化物を形成する元素である。結晶粒の粗大化を抑制し、亜鉛めっき鋼板の靭性を高めるには、0.01%以上のVを添加することが好ましい。V含有量が0.50%を超えると、亜鉛めっき鋼板の靭性が劣化することがある。そのため、V含有量の上限は0.50%が好ましい。
Mo:3.00%以下、
Ni:5.00%以下、
Cu:3.00%以下
Cr、Mo、Ni、Cuは、亜鉛めっき鋼板の延性及び靭性を向上させる有効な元素である。
しかし、Cr含有量、Mo含有量、Cu含有量は、それぞれ3.00%を超えると、亜鉛めっき鋼板の強度の上昇によって、靭性を損なうことがある。また、Ni含有量は5.00%を超えると、亜鉛めっき鋼板の強度の上昇によって、靭性を損なうことがある。したがって、Cr含有量の上限は3.00%、Mo含有量の上限は3.00%、Ni含有量の上限は5.00%、Cu含有量の上限は3.00%が好ましい。また、亜鉛めっき鋼板の延性及び靭性を向上させるには、Cr含有量は0.05%以上、Mo含有量は0.05%以上、Ni含有量は0.05%以上、Cu含有量は0.10%以上が好ましい。
Bは粒界に偏析し、P及びSの粒界偏析を抑制する元素である。しかし、B含有量が0.0100%を超えると、析出物を生じて、亜鉛めっき鋼板の熱間加工性を損なうことがある。したがって、B含有量を0.0100%以下とする。なお、粒界の強化によって、亜鉛めっき鋼板の延性、靭性及び熱間加工性を向上させるためには、B含有量は0.0003%以上が好ましい。
Mg:0.0100%以下、
Zr:0.0500%以下、
REM:0.0500%以下
Ca、Mg、Zr、REMは、硫化物の形態を制御し、Sに起因する亜鉛めっき鋼板の熱間加工性や靭性の劣化を抑制することに有効な元素である。しかし、過剰に添加しても効果が飽和するため、Ca含有量は0.0100%以下、Mg含有量は0.0100%以下、Zr含有量は0.0500%以下、REM含有量は0.0500%以下とすることが好ましい。また、亜鉛めっき鋼板の靭性を向上させるには、Ca含有量は0.0010%以上、Mg含有量は0.0005%以上、Zr含有量は0.0010%以上、REM含有量は0.0010%以上とすることが好ましい。
この場合、合金化溶融亜鉛めっき鋼板は、鋼板と;前記鋼板の表面に形成された、合金化溶融亜鉛めっき層と;を備え、前記鋼板の化学組成が、質量%で、C:0.100%超、0.500%以下、Si:0.0001%以上、0.20%未満、Mn:0.20%超、3.00%以下、Al:3.0%以上、10.0%以下、N:0.0030%以上、0.0100%以下、Ti:0.100%超、1.000%以下、P:0.00001%以上、0.0200%以下、S:0.00001%以上、0.0100%以下を含有し、質量%で、前記Cおよび前記Tiの含有量の和が、0.200<C+Ti≦1.500を満足し、前記Alおよび前記Siの含有量の積が、Al×Si≦0.8を満足し、残部がFeおよび不純物からなり、前記合金化溶融亜鉛めっき層が、質量%で、Fe:7%以上、15%以下、Ni:0.05%以上、1.0%以下、Al:0.15%以上、2.0%以下を含有し、残部がZnおよび不純物からなり、比重が5.5以上、7.5未満である。
この場合、溶融亜鉛めっき鋼板は、鋼板と;前記鋼板の表面に形成された、溶融亜鉛めっき層と;を備え、前記鋼板の化学組成が、質量%で、C:0.100%超、0.500%以下、Si:0.0001%以上、0.20%未満、Mn:0.20%超、3.00%以下、Al:3.0%以上、10.0%以下、N:0.0030%以上、0.0100%以下、Ti:0.100%超、1.000%以下、P:0.00001%以上、0.0200%以下、S:0.00001%以上、0.0100%以下を含有し、質量%で、前記Cおよび前記Tiの含有量の和が、0.200<C+Ti≦1.500を満足し、前記Alおよび前記Siの含有量の積が、Al×Si≦0.8を満足し、残部がFeおよび不純物からなり、前記溶融亜鉛めっき層が、質量%で、Fe:0.01%以上、7%未満、Ni:0.05%以上、1.0%以下、Al:0.15%以上、2.0%以下を含有し、残部がZnおよび不純物からなり、比重が5.5以上、7.5未満である。
(実施例1)
表1に示す化学組成を有する鋼を、溶鋼過熱度40℃で鋳造し、表2Aに示す条件で熱間圧延した。その後、表2Aに示す条件で、熱延鋼板の表面を研削した後、Niプレめっき処理を行った。さらに、表2Aに示す条件で溶融亜鉛めっき処理と一部には合金化加熱処理とを行った。なお、溶融亜鉛めっき処理後に、合金化加熱処理を行わない場合には、浴温が460℃で、成分組成が、質量%で、Al:0.2%〜0.4%、残部Zn及び不純物からなる亜鉛めっき浴を用いた。また、合金化加熱処理を行う場合には、浴温が460℃で、成分組成が、質量%で、Al:0.1%〜0.3%、残部Zn及び不純物からなる亜鉛めっき浴を用いた。また、めっき処理を行う前の熱延鋼板の板厚は2.3mmとした。
表1に示す化学組成を有する鋼を、溶鋼過熱度40℃で鋳造し、表2Aに示す条件で熱間圧延した熱延鋼板について、表3Aに示す条件で冷間圧延及び焼鈍を行った。その後、得られた冷延鋼板の表面を研削し、表3Aに示す条件でNiプレめっき処理を行った。さらに、表3Aに示す条件で、溶融亜鉛めっき処理と一部には合金化加熱処理とを行った。なお、溶融亜鉛めっき処理において、実施例1と同様の亜鉛めっき浴を用いた。また、めっきを行う冷延鋼板の板厚は1.2mmとした。
表4に示す化学組成を有する鋼を、溶鋼過熱度40℃で鋳造し、表5Aに示す条件で熱間圧延した。その後、得られた熱延鋼板の表面を研削し、表5Aに示す条件でNiプレめっき処理を行った。さらに、表5Aに示す条件で溶融亜鉛めっき処理と一部には合金化加熱処理とを行った。なお、溶融亜鉛めっき処理において、実施例1と同様の亜鉛めっき浴を用いた。また、めっき処理を行う前の熱延鋼板の板厚は2.3mmとした。
表4に示す化学組成を有する鋼を、溶鋼過熱度40℃で鋳造し、表5Aに示す条件で熱間圧延した熱延鋼板について、表6Aに示す条件で冷間圧延及び焼鈍を行った。その後、得られた冷延鋼板の表面を研削し、表6Aに示す条件でNiプレめっき処理を行った。さらに、表6Aに示す条件で溶融亜鉛めっき処理と一部には合金化加熱処理とを行った。なお、溶融亜鉛めっき処理において、実施例1と同様の亜鉛めっき浴を用いた。また、めっき処理を行う前の冷延鋼板の板厚は1.2mmとした。
Claims (6)
- 鋼板と;
前記鋼板の表面に形成された、亜鉛めっき層と;
を備え、
前記鋼板が化学成分として、質量%で、
C :0.100%超、0.500%以下、
Si:0.0001%以上、0.20%未満、
Mn:0.20%超、3.00%以下、
Al:3.0%以上、10.0%以下、
N :0.0030%以上、0.0100%以下、
Ti:0.100%超、1.000%以下、
P :0.00001%以上、0.0200%以下、
S :0.00001%以上、0.0100%以下、
Nb:0〜0.300%、
V :0〜0.50%、
Cr:0〜3.00%、
Mo:0〜3.00%、
Ni:0〜5.00%、
Cu:0〜3.00%、
B:0〜0.0100%、
Ca:0〜0.0100%、
Mg:0〜0.0100%、
Zr:0〜0.0500%、
REM:0〜0.0500%
を含有し、質量%で、前記Cおよび前記Tiの含有量の和が、
0.200<C+Ti≦1.500
を満足し、前記Alおよび前記Siの含有量の積が、
Al×Si≦0.8
を満足し、残部がFeおよび不純物からなり、
前記亜鉛めっき層が、化学成分として、質量%で、
Fe:0.01%以上、15%以下、
Ni:0.05%以上、1.0%以下、
Al:0.15%以上、2.0%以下
を含有し、残部がZnおよび不純物からなり、
比重が5.5以上、7.5未満であり、
引張強度(TS:MPa)と穴拡げ率(λ:%)が下記(1)式を満足する
ことを特徴とする亜鉛めっき性及び穴拡げ性に優れた亜鉛めっき鋼板。
TS×λ≧30000MPa・%・・・・・・(1) - 前記亜鉛めっき層が、前記化学成分として、質量%で、Fe:0.01%以上、7%未満を含有する溶融亜鉛めっき層である
ことを特徴とする請求項1に記載の亜鉛めっき性及び穴拡げ性に優れた亜鉛めっき鋼板。 - 前記亜鉛めっき層が、前記化学成分として、質量%で、Fe:7%以上、15%以下を含有する合金化溶融亜鉛めっき層であることを特徴とする請求項1に記載の亜鉛めっき性及び穴拡げ性に優れた亜鉛めっき鋼板。
- 前記鋼板のMn含有量が、質量%で、0.20%超、0.50%以下であることを特徴とする請求項1〜3の何れか1項に記載の亜鉛めっき性及び穴拡げ性に優れた亜鉛めっき鋼板。
- 請求項1に記載の亜鉛めっき性及び穴拡げ性に優れた亜鉛めっき鋼板の製造方法であって、
化学成分が、質量%で、
C :0.100%超、0.500%以下、
Si:0.0001%以上、0.20%未満、
Mn:0.20%超、3.00%以下、
Al:3.0%以上、10.0%以下、
N :0.0030%以上、0.0100%以下、
Ti:0.100%超、1.000%以下、
P :0.00001%以上、0.0200%以下、
S :0.00001%以上、0.0100%以下、
Nb:0〜0.300%、
V :0〜0.50%、
Cr:0〜3.00%、
Mo:0〜3.00%、
Ni:0〜5.00%、
Cu:0〜3.00%、
B:0〜0.0100%、
Ca:0〜0.0100%、
Mg:0〜0.0100%、
Zr:0〜0.0500%、
REM:0〜0.0500%
を含有し、質量%で、前記Cおよび前記Tiの含有量の和が、
0.200<C+Ti≦1.500
を満足し、前記AlおよびSiの含有量の積が、
Al×Si≦0.8
を満足し、残部がFeおよび不純物からなる鋼板に対して、
片面当たりのNiめっき付着量を0.2〜2g/m2とするNiプレめっき処理を行い;
前記Niプレめっき処理を行った前記鋼板に対して、20℃/秒以上の昇温速度で、430℃〜480℃の温度まで加熱する加熱処理を行い;
さらに、浴温度が440℃〜470℃で、Al:0.1%以上、0.4%以下であり、残部がZnおよび不純物からなる亜鉛めっき浴中に、前記鋼板を浸漬して、溶融亜鉛めっき処理を行う;
ことを特徴とする亜鉛めっき鋼板の製造方法。 - 前記溶融亜鉛めっき処理を行った後に、さらに、470℃〜560℃の加熱温度で、かつ10秒〜40秒の加熱時間で、合金化加熱処理を行うことを特徴とする請求項5に記載の亜鉛めっき鋼板の製造方法。
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CN105164298A (zh) | 2015-12-16 |
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JPWO2014178358A1 (ja) | 2017-02-23 |
ES2705349T3 (es) | 2019-03-22 |
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BR112015027009A2 (pt) | 2017-07-25 |
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CA2910439C (en) | 2018-02-20 |
MX2015015064A (es) | 2016-02-11 |
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RU2620842C1 (ru) | 2017-05-30 |
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ZA201508995B (en) | 2017-03-29 |
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