JP2020504239A - スポット溶接性及び耐食性に優れた単層亜鉛合金めっき鋼材及びその製造方法 - Google Patents
スポット溶接性及び耐食性に優れた単層亜鉛合金めっき鋼材及びその製造方法 Download PDFInfo
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Abstract
Description
[関係式1][C]+[Mn]/20+[Si]/30+2[P]+4[S]≧0.3
(ここで、[C]、[Mn]、[Si]、[P]及び[S]はそれぞれ、該当元素の含量(重量%)を意味する)
重量%で、C:0.16%、Si:1.43%、Mn:2.56%、Al:0.04%、P:0.006%、S:0.003%、残部がFe及び不可避不純物を含む、厚さ1.4mmの自動車用高強度冷延鋼板を準備し、図4の装置(真空度3.2×10−3mbar)を用いて下記表1のような組成の亜鉛合金めっき層を有する単層亜鉛合金めっき鋼材を製造した。すべての例において、亜鉛合金めっき層を形成する際に一対の電磁コイルに印加される電流は1.2kA、一対の電磁コイルに印加される周波数は、蒸着物質2kgを基準に60kHz、浮揚したコーティング物質の温度は1000℃、蒸気分配ボックスの温度は900℃と、一定にした。また、亜鉛合金めっき層の蒸着前後の素地鉄の温度は60℃に維持した。
1.非常に優秀:すべての試験片でタイプBクラックが発生していない場合
2.優秀:一部もしくはすべての試験片でタイプBクラックが発生し、タイプBクラックの平均長さが素地鉄(冷延鋼板)の厚さの0.1倍以下である場合
3.通常:一部もしくはすべての試験片でタイプBクラックが発生し、タイプBクラックの平均長さが素地鉄(冷延鋼板)の厚さの0.1倍超過0.2倍以下である場合
4.不良:一部もしくはすべての試験片でタイプBクラックが発生し、タイプBクラックの平均長さが素地鉄(冷延鋼板)の厚さの0.2倍を超える場合
1.優秀:片面付着量60g/m2の亜鉛めっき鋼板(GI鋼板)に比べて赤錆の発生時間が2倍以上長い場合
2.普通:片面付着量60g/m2の亜鉛めっき鋼板(GI鋼板)に比べて赤錆の発生時間が同等レベルであるか、または2倍未満長い場合
3.不良:片面付着量60g/m2の亜鉛めっき鋼板(GI鋼板)に比べて赤錆の発生時間が短い場合
Claims (14)
- 素地鉄と、前記素地鉄上に形成された亜鉛合金めっき層とを含み、前記亜鉛合金めっき層は、13〜24重量%のMgを含み、前記亜鉛合金めっき層の付着量は、40g/m2以下(0g/m2は除く)である、単層亜鉛合金めっき鋼材。
- 前記亜鉛合金めっき層は、15.7〜20重量%のMgを含む、請求項1に記載の単層亜鉛合金めっき鋼材。
- 前記亜鉛合金めっき層の付着量は、10〜35g/m2である、請求項1に記載の単層亜鉛合金めっき鋼材。
- 前記亜鉛合金めっき層をなす結晶粒の平均粒径は、100nm以下(0nmは除く)である、請求項1に記載の単層亜鉛合金めっき鋼材。
- 前記亜鉛合金めっき層の厚さ方向中心部でGDSプロファイルを測定するときに、Mg含量の偏差が±5%以内である、請求項1に記載の単層亜鉛合金めっき鋼材。
- 前記単層亜鉛合金めっき鋼材のスポット溶接時、溶接部上の亜鉛合金めっき層は、90面積%以上(100面積%を含む)のMgZn2合金相を含む合金層に変化する、請求項1に記載の単層亜鉛合金めっき鋼材。
- SEP1220−2規格に従ってスポット溶接を行うときに、タイプBクラックの平均長さが素地鉄の厚さの0.1倍以下である、請求項1に記載の単層亜鉛合金めっき鋼材。
- 前記素地鉄は、重量%で、C:0.10〜1.0%、Si:0.5〜3%、Mn:1.0〜25%、Al:0.01〜10%、P:0.1%以下(0%は除く)、S:0.01%以下(0%は除く)、残部Fe及び不可避不純物を含む、請求項1に記載の単層亜鉛合金めっき鋼材。
- 前記素地鉄に含まれるC、Si、Mn、P及びSの含量は、下記関係式1を満たす、請求項8に記載の単層亜鉛合金めっき鋼材。
[関係式1][C]+[Mn]/20+[Si]/30+2[P]+4[S]≧0.3
(ここで、[C]、[Mn]、[Si]、[P]及び[S]はそれぞれ、該当元素の含量(重量%)を意味する) - 前記素地鉄は、微細組織として、オーステナイト及び残留オーステナイトのうち1種以上を含む、請求項8に記載の単層亜鉛合金めっき鋼材。
- 素地鉄を準備する段階と、
真空チャンバー内で電磁力によってコーティング物質を浮揚及び加熱してZn及びMg合金蒸着蒸気を生成し、前記Zn及びMg合金蒸着蒸気を前記素地鉄の表面に誘導噴出してMg蒸着層を形成する段階と、を含み、
前記Zn及びMg合金蒸着蒸気内のMgの含量は、13〜24重量%であり、前記亜鉛合金めっき層の付着量は、40g/m2以下(0g/m2は除く)である、単層亜鉛合金めっき鋼材の製造方法。 - 前記Zn及びMg合金蒸着蒸気内のMgの含量は、15.7〜20重量%である、請求項11に記載の単層亜鉛合金めっき鋼材の製造方法。
- 前記浮揚したコーティング物質の温度は、700℃以上である、請求項11に記載の単層亜鉛合金めっき鋼材の製造方法。
- 蒸着前後の素地鉄の温度は、100℃以下である、請求項11に記載の単層亜鉛合金めっき鋼材の製造方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020160178835A KR101940885B1 (ko) | 2016-12-26 | 2016-12-26 | 점용접성 및 내식성이 우수한 단층 아연합금도금강재 및 그 제조방법 |
KR10-2016-0178835 | 2016-12-26 | ||
PCT/KR2017/015222 WO2018124630A1 (ko) | 2016-12-26 | 2017-12-21 | 점용접성 및 내식성이 우수한 단층 아연합금도금강재 및 그 제조방법 |
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CN110139944A (zh) | 2019-08-16 |
CN110139944B (zh) | 2022-01-28 |
KR101940885B1 (ko) | 2019-01-21 |
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