JP2014139350A - 熱間プレス用めっき鋼板及び熱間プレス成形品 - Google Patents
熱間プレス用めっき鋼板及び熱間プレス成形品 Download PDFInfo
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Abstract
【解決手段】鋼板の片面又は両面にAlめっき層を形成し、水酸化Zn、リン酸Zn、及び有機酸Znからなる群より選択された1つ以上のZn化合物を含有する表面皮膜層を前記Alめっき層上に形成する。
【選択図】図2
Description
(9)前記Alめっき層が、Siを3〜15%含有することを特徴とする、前記(6)〜(8)のいずれかに記載の熱間プレス成形品。
(10)前記Zn化合物として、硫酸Zn及び硝酸Znの一方又は両方を、質量%で、それぞれ10%以下含有することを許容する前記(6)〜(9)のいずれかに記載の熱間プレス成形品。
まず、本発明の熱間プレス用めっき鋼板について説明する。本発明の熱間プレス用めっき鋼鈑は、鋼板の片面又は両面に、Alめっき層が形成され、そのAlめっき層の表面に、Znの化合物を含有する表面皮膜層が更に形成される。
めっき前の鋼板としては、高い機械的強度(引張強さ、降伏点、伸び、絞り、硬さ、衝撃値、疲れ強さ、及びクリープ強さ等の機械的な変形及び破壊に関する諸性質を意味する。)を有する鋼板を使用することが望ましい。本発明の熱間プレス用鋼鈑に使用される、めっき前の鋼鈑の一例を次に示す。
Alめっき層は、めっき前の鋼板の片面又は両面に形成される。Alめっき層は、例えば、溶融めっき法により鋼板の片面又は両面に形成されるが、これに限定されるものではない。
表面皮膜層は、Alめっき層の表面に形成される。表面皮膜層は、水酸化Zn、リン酸Zn、及び有機酸Znからなる群より選択された1つ以上のZn化合物を含有するものとする。Zn化合物としては、水酸化Zn、リン酸Znが特に好ましい。有機酸Znとしては、酢酸Zn、クエン酸Zn、シュウ酸Zn、及びオレイン酸Znを代表とするカルボン酸のZn塩、並びに、ヒドロキシ酸化合物のZn塩及びグルコン酸亜鉛などが挙げられる。これらの化合物は、熱間プレスにおける潤滑性や、化成処理液との反応性を改善する効果がある。水酸化Zn及びリン酸Znは、水への溶解度が小さいため懸濁液として使用し、水への溶解度の大きい酢酸Znは、水溶液として使用することが好ましい。
なお、これらZn化合物には、硫酸Zn及び硝酸Znの一方又は両方を含有してもよいが、質量%で10%を超えると、前述した通り、塗装後耐食性や溶接性を劣化させる。したがって、硫酸Zn及び硝酸Znそれぞれの含有率の許容値は10%以下とすることが好ましい。
次に本発明の熱間プレス用めっき鋼鈑を熱間プレスする方法について説明する。
本発明の熱間プレス用めっき鋼板は、Znを含有する化合物、特に水酸化Znを含有する表面皮膜層を有することにより、高い潤滑性を実現し、化成処理性が改善される。また、本発明の熱間プレス用めっき鋼板は、成形後の皮膜が剥離し難い。その結果、Al−Fe金属間化合物の金型への凝着を防止し、熱間プレス加工時における成形性及び生産性を向上させるとともに、熱間プレス成形後の化性処理性をも改善する。更に、本発明の熱間プレス用めっき鋼鈑は、成形後のAlめっき層及び表面皮膜層の密着性に優れ、成形品の耐食性、即ち、塗装後耐食性にも優れる。
表1に示す成分組成の冷延鋼板(板厚1.4mm)を使用して、この冷延鋼板にゼンジマー法でAlめっきした。焼鈍温度は約800℃とし、Alめっき浴はSiを9%含有し、他に冷延鋼鈑から溶出するFeを含有していた。めっき後のAl付着量をガスワイピング法で両面160g/m2に調整し、冷却後、表2に示す懸濁液又は水溶液をロールコーターで塗布し、約80℃で焼きつけ供試材を製造した。なお、表2に示す溶液は、いずれも試薬を使用して蒸留水と混合し、懸濁液又は水溶液とした。
図1に示す装置を使用して、熱間潤滑性を評価した。150×200mmの供試材を900℃に加熱後、700℃で鋼球を上から押し当て、押付け荷重と引抜き荷重とを測定し、(引抜き荷重)/(押し付け荷重)を動摩擦係数とした。
供試材を大気炉内に挿入し、900℃で6分間加熱し、取り出し後直ちにステンレス製金型に挟んで急冷した。このときの冷却速度は150℃/秒とした。次に、供試材を50×50mmに剪断し、ラビング試験を行った。方法は2.0kgf(1kgfは、9.8Nである。)の荷重を加えたガーゼを、30mmの長さについて10往復させ、試験前後のZn付着量を測定し、減量%を計算した。
供試材を大気炉内に挿入し、900℃で6分間加熱し、取り出し後直ちにステンレス製金型に挟んで急冷した。冷却速度は、150℃/秒とした。次に供試材を30×50mmに剪断し、スポット溶接適正電流範囲(上限電流と下限電流との差)を測定した。測定条件は次に示すとおりである。下限電流は、ナゲット径4t1/2(t:板厚)が4.4mmとなったときの電流値、上限電流はチリ発生電流とした。
電極:クロム銅製、DR型(先端径6mm、40Rのラジアス形状)
加圧:400kgf(1kgfは、9.8N)
通電時間:12サイクル(60Hz)
供試材を大気炉内に挿入し、900℃で6分間加熱し、取り出し後直ちにステンレス製金型に挟んで急冷した。冷却速度は、150℃/秒とした。次に供試材を70×150mmに剪断し、日本パーカライジング(株)社製化成処理液(PB−SX35)を用いて化成処理後、日本ペイント(株)社製電着塗料(パワーニクス110)を塗布し170℃で焼き付け、20μmの塗膜とした。
表2のAのZn化合物を含有する懸濁液に、ウレタン樹脂を、Zn(OH)2に対して添加比率(%)を変化させた処理液を調製し、実施例1のAlめっき鋼板に塗布して表面皮膜層を形成した供試材を準備した。焼付条件は、実施例1と同じである。そして、この供試材の密着性を評価した。評価方法は、加熱前に評価したこと以外は、実施例1と同じである。即ち、供試材を50×50mmに剪断し、ラビング試験を行った。方法は1.5kgf(1kgfは、約9.8Nである。)の荷重を加えたガーゼを、30mmの長さについて10往復させ、試験前後のZn付着量を測定し、減量%を計算した。
実施例1において、番号1のZn化合物を含有する処理液を用いて形成した、本発明の熱間プレス用めっき鋼鈑を使用し、近赤外線炉を使用して平均加熱速度30℃/秒で加熱した供試材の特性を評価した。評価方法は、加熱方法以外、実施例1で示した方法と同様である。評価結果を表6に示す。塗装後耐食性が番号1の場合よりも優れる結果となり急速加熱方法は有効であることが確認できた。
表1に示す成分組成の冷延鋼板(板厚1.4mm)を使用して、この冷延鋼板にゼンジマー法でAlめっきした。Alめっき浴はSi濃度を3、6、9、13、15、18、及び21%と変化させ、他に冷延鋼鈑から溶出するFeを含有していた。めっき後のAl付着量をガスワイピング法で両面160g/m2に調整し、冷却後、表2のAで示したZn化合物を含有する処理液をロールコーターで塗布し、約80℃で焼きつけ供試材を製造した。これらの供試材の特性を実施例1と同様の方法で評価した。なお、Zn付着量はいずれも約1g/m2であった。評価結果を表7に示す。表7から明らかなように、Si濃度が3〜15%のときの塗装後耐食性が特に優れることを確認できた。
Claims (10)
- 鋼板と、
前記鋼板上の片面又は両面に形成されたAlめっき層と、
前記Alめっき層上に形成された表面皮膜層を含む熱間プレス用めっき鋼板であり、
前記表面皮膜層は、水酸化Zn及び有機酸Znからなる群より選択された1つ以上のZn化合物を含有し、該Zn化合物の付着量は、Znとして片面あたり0.5〜7g/m2であることを特徴とする、熱間プレス用めっき鋼板。 - 前記表面皮膜中に、前記Zn化合物に加えて、樹脂成分、シランカップリング剤又はシリカの少なくともいずれかを、前記Zn化合物の総量に対する質量比率で、あわせて5〜30%含有することを特徴とする、請求項1に記載の熱間プレス用めっき鋼板。
- 前記Alめっき層が、Siを3〜15%含有することを特徴とする、請求項1又は2に記載の熱間プレス用めっき鋼鈑。
- 前記Zn化合物として、硫酸Zn及び硝酸Znの一方又は両方を、質量%で、それぞれ10%以下含有することを許容する請求項1又は2に記載の熱間プレス用めっき鋼鈑。
- 前記Zn化合物として、硫酸Zn及び硝酸Znの一方又は両方を、質量%で、それぞれ10%以下含有することを許容する請求項3に記載の熱間プレス用めっき鋼鈑。
- 鋼板の片面又は両面に形成されたAlめっき層と、前記Alめっき層上に形成され、水酸化Zn、リン酸Zn、及び有機酸Znからなる群より選択された1つ以上のZn化合物を含有する表面皮膜層とを有するめっき鋼板を、ブランキング後加熱し、加熱された前記めっき鋼板をプレスして得ることを特徴とする、熱間プレス成形品。
- 前記表面皮膜層におけるZn化合物の付着量は、Znとして片面あたり0.5〜7g/m2であることを特徴とする、請求項6に記載の熱間プレス成形品。
- 前記表面皮膜中に、前記Zn化合物に加えて、樹脂成分、シランカップリング剤又はシリカの少なくともいずれかを、前記Zn化合物の総量に対する質量比率で、あわせて5〜30%含有することを特徴とする、請求項6又は7に記載の熱間プレス成形品。
- 前記Alめっき層が、Siを3〜15%含有することを特徴とする、請求項6〜8のいずれか1項に記載の熱間プレス成形品。
- 前記Zn化合物として、硫酸Zn及び硝酸Znの一方又は両方を、質量%で、それぞれ10%以下含有することを許容する請求項6〜9のいずれか1項に記載の熱間プレス成形品。
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WO2018123831A1 (ja) | 2016-12-28 | 2018-07-05 | 新日鐵住金株式会社 | 熱間プレス用めっき鋼板、熱間プレス用めっき鋼板の製造方法、熱間プレス成形品の製造方法、及び車両の製造方法 |
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JPWO2019198728A1 (ja) * | 2018-04-13 | 2021-04-22 | 日本製鉄株式会社 | 熱間プレス成形品の製造方法、プレス成形品、ダイ金型、及び金型セット |
JP7081662B2 (ja) | 2018-04-13 | 2022-06-07 | 日本製鉄株式会社 | 熱間プレス成形品の製造方法、プレス成形品、ダイ金型、及び金型セット |
EP4186611A1 (en) | 2018-04-13 | 2023-05-31 | Nippon Steel Corporation | Production method for hot press molded articles, press molded article, die mold, and mold set |
CN112236243A (zh) * | 2018-07-04 | 2021-01-15 | 日本制铁株式会社 | 热压成型品的制造方法、压制成型品、冲模模具及模具套件 |
US11491528B2 (en) | 2018-07-04 | 2022-11-08 | Nippon Steel Corporation | Hot press-formed item manufacturing method, press-formed item, die, and die set |
US11633772B2 (en) | 2018-07-04 | 2023-04-25 | Nippon Steel Corporation | Hot press-formed item manufacturing method, press-formed item, die, and die set |
Also Published As
Publication number | Publication date |
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JP2015165049A (ja) | 2015-09-17 |
CN104093880B (zh) | 2016-12-21 |
EP2816139A4 (en) | 2015-12-09 |
KR20160078521A (ko) | 2016-07-04 |
EP2816139B1 (en) | 2019-10-09 |
JPWO2013122004A1 (ja) | 2015-05-11 |
KR101974182B1 (ko) | 2019-04-30 |
CA2864392A1 (en) | 2013-08-22 |
IN2014DN06844A (ja) | 2015-05-22 |
MX2014009731A (es) | 2014-11-10 |
US10092938B2 (en) | 2018-10-09 |
MX365687B (es) | 2019-06-11 |
ES2765101T3 (es) | 2020-06-05 |
RU2584105C2 (ru) | 2016-05-20 |
JP5582254B2 (ja) | 2014-09-03 |
JP6028761B2 (ja) | 2016-11-16 |
US20150020562A1 (en) | 2015-01-22 |
MX2019003385A (es) | 2019-07-08 |
TW201335425A (zh) | 2013-09-01 |
TWI470118B (zh) | 2015-01-21 |
WO2013122004A1 (ja) | 2013-08-22 |
PL2816139T3 (pl) | 2020-04-30 |
BR112014019984A2 (pt) | 2017-06-13 |
ZA201405948B (en) | 2015-11-25 |
RU2014137101A (ru) | 2016-04-10 |
EP2816139A1 (en) | 2014-12-24 |
CA2864392C (en) | 2018-01-02 |
BR112014019984B1 (pt) | 2021-03-09 |
JP6048525B2 (ja) | 2016-12-21 |
CN104093880A (zh) | 2014-10-08 |
KR20140119738A (ko) | 2014-10-10 |
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