JP6505480B2 - 溶融亜鉛めっき用または合金化溶融亜鉛めっき用原板、および溶融亜鉛めっき鋼板または合金化溶融亜鉛めっき鋼板 - Google Patents
溶融亜鉛めっき用または合金化溶融亜鉛めっき用原板、および溶融亜鉛めっき鋼板または合金化溶融亜鉛めっき鋼板 Download PDFInfo
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- JP6505480B2 JP6505480B2 JP2015053267A JP2015053267A JP6505480B2 JP 6505480 B2 JP6505480 B2 JP 6505480B2 JP 2015053267 A JP2015053267 A JP 2015053267A JP 2015053267 A JP2015053267 A JP 2015053267A JP 6505480 B2 JP6505480 B2 JP 6505480B2
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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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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- Y10T428/12792—Zn-base component
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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
- Y10T428/12785—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
- Y10T428/12958—Next to Fe-base component
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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
- Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
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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
- Y10T428/12972—Containing 0.01-1.7% carbon [i.e., steel]
- Y10T428/12979—Containing more than 10% nonferrous elements [e.g., high alloy, stainless]
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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
- Y10T428/12993—Surface feature [e.g., rough, mirror]
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Description
で濃化してくるSiおよびMnも巻き込んで、亜鉛めっき用原板の表面に広く、融点の低い溶融状態のSi−Mn複合酸化物を形成すると考えられる。昇温した後、降温するが、上述したSi−Mn複合酸化物の融点が上記鋼板の板温より低温であるならば、Si−Mn複合酸化物は凝固を開始すると考えられる。このとき、Si−Mn複合酸化物は凝集しながら凝固するので、亜鉛めっき用原板上には、微細なドーム状の酸化物が形成されると予測される。そのため、亜鉛めっき用原板表面に占める上記酸化物の占積率は小さくなり、Feの露出面が広く出現すると考えられる。一方、600℃程度の範囲で保持せず昇温した場合には、溶融状態のSi−Mn複合酸化物は形成されず、融点が900℃を超える様なSi酸化物、Mn酸化物、またはSi−Mn複合酸化物が亜鉛めっき用原板の表面を広く覆うため、不めっきが発生しやすくなると考えられる。
Cはめっき鋼板の強度を上昇させるために必要な元素であり、C量が0.06%未満では強度の確保が困難である。そのために、C量の下限を0.06%以上とする。C量の下限は、好ましくは0.07%以上、より好ましくは0.08%以上である。しかしながら、C量が過剰になると溶接性が低下するようになるため、C量の上限を0.3%以下とする。C量の上限は、好ましくは0.28%以下、より好ましくは0.25%以下である。
Siは固溶強化元素であり、めっき鋼板の強度を上昇させることに有効である。また、Siは特にめっき層に摺動を伴うような加工に対して、めっき密着性を高める効果も有している。そのために、Si量の下限を1.00%以上とする。Si量の下限は、好ましくは1.1%以上、より好ましくは1.2%以上である。しかしながら、Si量が1.6%を超えると、酸化物の凝集が不十分となり、Fe露出率を70%以上に確保することができず、不めっき発生を抑制することができなくなる。そのためSi量の上限を1.6%以下とする。Si量の上限は、好ましくは1.5%以下、より好ましくは1.4%以下である。
Mnは焼入れ性を高め、めっき鋼板の強度を高めるために有用な元素である。そのためにMn量の下限を1%以上とする。Mn量の下限は、好ましくは1.2%以上、より好ましくは1.4%以上である。しかしながら、Mn量が3%を超えるとMnの偏析が生じて加工性が低下する。そのためにMn量の上限を3%以下とする。Mn量の上限は、好ましくは2.9%以下、より好ましくは2.8%以下である。
Alは脱酸目的で添加するとともにフェライトの形成を促進し、延性を高める効果がある。そのためにAl量の下限を0%超とする。Al量の下限は、好ましくは0.02%以上、より好ましくは0.04%以上である。しかしながら、過剰な添加はAl系の粗大介在物の個数を増大させ、穴拡げ性の劣化や表面疵の原因となる。そのために、Al量の上限を0.1%以下とする。Al量の上限は、好ましくは0.09%以下、より好ましくは0.08%以下である。
更に、鋼中のSi量(質量%)とMn量(質量%)の関係は、Si/Mnの比が1.0以下を満たす必要がある。Si量がMn量より多くなると、還元焼鈍時に発生するSiO2の生成を抑制できない。SiO2は、溶融亜鉛と反応しないため、これが原板表面に形成すると不めっきが発生する。Si/Mnの上限は、好ましくは0.98以下、より好ましくは0.95以下である。Si/Mnの下限は、Si量の下限およびMn量の上限を考慮すると、好ましくは0.33以上、より好ましくは0.38以上である。
CrおよびMoは、いずれも焼入れ性向上に有効な元素である。これらの元素は、夫々単独でまたは適宜組み合わせて含有させても良い。
Crは焼入れ性を向上させ、原板のミクロ組織に硬質なベイナイトやマルテンサイトを形成させて、めっき鋼板の高強度化に有効に寄与する元素である。そのために、Cr量の下限は、好ましくは0%超、より好ましくは0.1%以上である。しかしながら、Cr量が1%を超えると、この効果は飽和する。そのためにCr量の上限は、好ましくは1%以下、より好ましくは0.9%以下とする。なお、Crは不めっき発生の抑制には、ほとんど寄与しない。
Moは焼入れ性を向上させ、原板のミクロ組織に硬質なベイナイトやマルテンサイトを形成させて、めっき鋼板の高強度化に有効に寄与する元素である。そのために、Mo量の下限は、好ましくは0%超、より好ましくは0.1%以上である。しかしながら、Mo量が1%を超えるとこの効果は飽和するとともに大幅なコストアップとなる。そのためにMo量の上限は、好ましくは1%以下、より好ましくは0.9%以下とする。
BはSiおよびMnと同様に、易酸化性元素であるが、還元焼鈍過程において原板表面に移動する際、SiおよびMnが、再結晶により形成された結晶粒界を移動するのに対し、Bは粒界の形成に関係なく原板表面に移動するといわれている。Bの酸化物B2O3は融点が低く、ガラス状の複合酸化物を形成し、複合酸化物の融点を低下させる。上記複合酸化物の融点は不明であるが、Bを添加することで低融点のガラス状複合酸化物が、より形成されやすくなり、酸化物がドーム状に凝集してFe露出率が一層大きくなりやすくなると考えられる。上記複合酸化物の形成され易さなどを考慮すると、Bの下限は、好ましくは0%超、より好ましくは0.0003%以上である。しかしながら、B量が0.005%を超えても複合酸化物形成効果は飽和し、めっき性はそれ以上改善しない。そのためにB量の上限は、好ましくは0.005%以下、より好ましくは0.004%以下とする。
TiおよびNbは、いずれもミクロ組織を微細化する効果を有し、強度と延性のバランスを高める元素である。これらの元素は、夫々単独でまたは適宜組み合わせて含有させても良い。
Tiは、フェライト中に析出することでめっき鋼板の高強度化にも有効な元素でもある。そのために、Ti量の下限は、好ましくは0%超、より好ましくは0.01%以上である。しかしながら、Ti量が0.1%を超えるとこの効果は飽和する。そのためにTi量の上限は、好ましくは0.1%以下、より好ましくは0.09%以下、更に好ましくは0.08%以下とする。
Nbは、フェライト中に析出することでめっき鋼板の高強度化にも有効な元素でもある。そのために、Nb量の下限は、好ましくは0%超、より好ましくは0.01%以上である。しかしながら、Nb量が0.1%を超えるとフェライトの延性を低下させ、加工性が低下する。そのためにNb量の上限は、好ましくは0.1%以下、より好ましくは0.09%以下、更に好ましくは0.08%以下とする。
還元焼鈍時の加熱処理は、亜鉛めっき用原板表面におけるFe露出領域を確保するために、H2を5〜10体積%含有し、残部がN2および不可避的不純物である還元雰囲気下で行う。H2濃度が5体積%未満では、Feの酸化を抑制することはできない。そのためH2の下限値を5体積%以上とする。好ましくは5.5体積%以上、より好ましくは6体積%以上である。しかしながら、H2が10体積%を超えると、還元焼鈍後の亜鉛めっき用原板表面におけるFe露出領域が低減し、不めっき発生面積率が上昇する。そのために、H2の上限値を10体積%以下とする。H2の上限値は好ましくは9.5体積%以下、より好ましくは9体積%以下である。なお、窒素ガス雰囲気中のH2量が10体積%を超えると上記Fe露出領域が低減する詳細な理由は不明であるが、H2濃度が高くなるとSiおよびMnが結晶粒界だけでなく結晶粒内にも濃化しやすくなり、その結果、Fe面の露出が妨げられると考えられる。
Ac1点
=723−10.7×[Mn]−16.9×[Ni]+29.1×[Si]+16.9×[Cr]+290×[As]+6.38×[W]
本発明における還元焼鈍工程は、昇温の際、鋼板の板温を600〜620℃の温度域で20秒以上保持する工程を含むことが重要である。前述した、低融点のMnO2を起点とするSi−Mn複合酸化物の凝集メカニズムによれば、昇温の際に留意すべき温度域は600〜620℃の範囲であり、この温度域を通過する時間を20秒以上とすれば、不めっきの発生が抑制されためっき鋼板が得られることを見出した(後記する実施例を参照)。
本発明では、所望とする亜鉛めっき用原板を還元焼鈍により、新たな設備を設けることなく低コストで効率よく製造するとの観点から、露点の範囲は、工業上採用可能な範囲とする。下限については、工業的に−55℃未満の露点とすることは困難であるため、好ましくは−55℃以上、より好ましくは−50℃以上とする。一方、露点が0℃を超えると、ガスが供給される配管系統内に結露が発生する危険性が高くなり、これを防止するために設備投資が必要となる。そのために、露点の上限値は、好ましくは0℃以下、より好ましくは−10℃以下とする。
EPMA装置(島津製作所製EPMA−8705)
加速電圧:20kV、
試料電流:0.01μA、
ビーム径:直径3μm、
X線:Kα線
測定領域:33.6μm×41.4μm
良 :不めっき発生面積率が0%以上3%以下
不良:不めっき発生面積率が3%超
Claims (5)
- 質量%で、
C :0.06〜0.3%、
Si:1.00〜1.6%、
Mn:1〜3%、
Al:0%超0.1%以下、
を含有し、
残部が鉄および不可避的不純物であり、
Si/Mnの比が1.0以下を満足する鋼板を、還元焼鈍して得られる亜鉛めっき用原板であって、
前記亜鉛めっき用原板の表面について、電子線マイクロアナライザーによりFeのマッピングを実施し、33.6μm×41.4μmの測定視野に観察されるFeのマッピング強度を0から240まで15間隔で16分割したとき、前記マッピング強度が195以上の占める領域が70%以上であることを特徴とする溶融亜鉛めっき用または合金化溶融亜鉛めっき用原板。 - 更に、質量%で、
Cr:0%超1%以下、および
Mo:0%超1%以下よりなる群から選択される少なくとも1種を含有する請求項1に記載の溶融亜鉛めっき用または合金化溶融亜鉛めっき用原板。 - 更に、質量%で、
B:0%超0.005%以下を含有する請求項1または2に記載の溶融亜鉛めっき用または合金化溶融亜鉛めっき用原板。 - 更に、質量%で、
Ti:0%超0.1%以下、および
Nb:0%超0.1%以下よりなる群から選択される少なくとも1種を含有する請求項1〜3のいずれかに記載の溶融亜鉛めっき用または合金化溶融亜鉛めっき用原板。 - 請求項1〜4のいずれかに記載の溶融亜鉛めっき用または合金化溶融亜鉛めっき用原板を用いて得られる溶融亜鉛めっき鋼板または合金化溶融亜鉛めっき鋼板。
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MX2017002520A MX2017002520A (es) | 2014-08-29 | 2015-08-11 | Sustrato para la galvanizacion por inmersion en caliente o galvanizacion seguida por recocido por inmersion en caliente, metodo de produccion del mismo, y lamina de acero galvanizada por inmersion en caliente o lamina de acero galvanizada seguida por recocido por inmersion en caliente. |
US15/323,165 US10597764B2 (en) | 2014-08-29 | 2015-08-11 | Substrate for hot-dip galvanizing or hot-dip galvannealing, production method therefor, and hot-dip galvanized steel sheet or hot-dip galvannealed steel sheet |
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JP4729850B2 (ja) | 2003-02-10 | 2011-07-20 | Jfeスチール株式会社 | めっき密着性に優れた合金化溶融亜鉛めっき鋼板およびその製造方法 |
JP3997931B2 (ja) * | 2003-03-04 | 2007-10-24 | Jfeスチール株式会社 | 高張力溶融亜鉛めっき鋼板の製造方法 |
US8592049B2 (en) | 2006-01-30 | 2013-11-26 | Nippon Steel & Sumitomo Metal Corporation | High strength hot dip galvanized steel sheet and high strength galvannealed steel sheet excellent in shapeability and plateability |
JP5223360B2 (ja) * | 2007-03-22 | 2013-06-26 | Jfeスチール株式会社 | 成形性に優れた高強度溶融亜鉛めっき鋼板およびその製造方法 |
EP2415896B1 (en) * | 2009-03-31 | 2016-11-16 | JFE Steel Corporation | Method for producing high-strength hot-dip galvanized steel plate |
CN103827342B (zh) * | 2011-09-30 | 2016-06-22 | 新日铁住金株式会社 | 镀覆润湿性及镀覆密合性优良的具备热浸镀锌层的钢板及其制造方法 |
JP5267638B2 (ja) * | 2011-11-17 | 2013-08-21 | Jfeスチール株式会社 | 高強度溶融亜鉛めっき鋼板または高強度合金化溶融亜鉛めっき鋼板用熱延鋼板およびその製造方法 |
JP5799819B2 (ja) * | 2012-01-13 | 2015-10-28 | 新日鐵住金株式会社 | めっき濡れ性及び耐ピックアップ性に優れる溶融亜鉛めっき鋼板の製造方法 |
KR101950546B1 (ko) | 2012-04-23 | 2019-02-20 | 가부시키가이샤 고베 세이코쇼 | 핫 스탬핑용 아연도금 강판의 제조 방법, 핫 스탬핑용 합금화 용융 아연도금 강판과 그의 제조 방법, 및 핫 스탬핑 부품 |
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US20170137923A1 (en) | 2017-05-18 |
JP2016050356A (ja) | 2016-04-11 |
CN106574344A (zh) | 2017-04-19 |
MX2017002520A (es) | 2017-05-23 |
WO2016031556A1 (ja) | 2016-03-03 |
KR20170042667A (ko) | 2017-04-19 |
CN106574344B (zh) | 2018-11-06 |
US10597764B2 (en) | 2020-03-24 |
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