JP2013227660A - 板幅方向における中央部と端部の強度差が少なく、曲げ加工性に優れた高強度溶融亜鉛めっき鋼板、高強度合金化溶融亜鉛めっき鋼板、およびこれらの製造方法 - Google Patents
板幅方向における中央部と端部の強度差が少なく、曲げ加工性に優れた高強度溶融亜鉛めっき鋼板、高強度合金化溶融亜鉛めっき鋼板、およびこれらの製造方法 Download PDFInfo
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- JP2013227660A JP2013227660A JP2013058932A JP2013058932A JP2013227660A JP 2013227660 A JP2013227660 A JP 2013227660A JP 2013058932 A JP2013058932 A JP 2013058932A JP 2013058932 A JP2013058932 A JP 2013058932A JP 2013227660 A JP2013227660 A JP 2013227660A
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- steel sheet
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- dip galvanized
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Abstract
【解決手段】C、Mn、P、S、Al、下記式(1)を満足する量のTi、B、およびNを含有し、必要に応じSiを含有し、残部が鉄および不可避不純物からなる素地鋼板の表面に溶融亜鉛めっき層を有する溶融亜鉛めっき鋼板であり、前記素地鋼板の金属組織は、マルテンサイト、ベイナイト、およびフェライトを有し、前記金属組織全体に対する比率は、前記マルテンサイトは50面積%以上、前記ベイナイトは15〜50面積%、前記フェライトは5面積%以下(0面積%を含む)を満足する高強度溶融亜鉛めっき鋼板。0.005×[Mn]+0.02×[B]1/2+0.025≦[Ti]≦0.15・・・(1)
【選択図】図2
Description
0.005×[Mn]+0.02×[B]1/2+0.025≦[Ti]≦0.15・・・
(1)
(a)Cr:1%以下(0%を含まない)および/またはMo:1%以下(0%を含まない)、
(b)Nb:0.2%以下(0%を含まない)および/またはV:0.2%以下(0%を含まない)、
(c)Cu:1%以下(0%を含まない)および/またはNi:1%以下(0%を含まない)、
を含有するものであってもよい。
温度まで、平均冷却速度3℃/秒以上で冷却してから15秒以上保持し、溶融亜鉛めっきを施すことによって製造できる。
0.005×[Mn]+0.02×[B]1/2+0.025≦[Ti]≦0.15・・・
(1)
せる必要がある。式(1)の左辺値(Z値)は、本発明者らが実験を繰り返して見出したものであり、各係数は、ベイナイト変態の抑制に影響を与える寄与率を示している。しかしTiを過剰に含有すると、TiCなどの微細炭化物が析出し、曲げ加工性が劣化する。従ってTiは0.15%以下、好ましくは0.1%以下、より好ましくは0.09%以下とする。
CrおよびMoは、いずれも焼入れ性を向上させ、素地鋼板の強度を向上させるのに作用する元素である。CrとMoは、単独で添加しても良いし、併用しても良い。
NbおよびVは、いずれも金属組織を微細化し、素地鋼板の曲げ加工性を向上させるのに作用する元素である。こうした作用を有効に発揮させるには、Nbは0.01%以上含有させることが好ましく、より好ましくは0.02%以上、更に好ましくは0.03%以上とする。Vは0.01%以上含有させることが好ましく、より好ましくは0.02%以上、更に好ましくは0.03%以上とする。しかしNbとVを過剰に含有すると微細炭化物が多く析出し、曲げ加工性が劣化することがある。従ってNbは0.2%以下とすることが好ましく、より好ましくは0.15%以下、更に好ましくは0.1%以下とする。Vは0.2%以下とすることが好ましく、より好ましくは0.15%以下、更に好ましくは0.1%以下とする。NbとVは、単独で添加しても良いし、併用しても良い。
CuおよびNiは、いずれも素地鋼板の強度向上に作用する元素である。こうした作用を有効に発揮させるには、Cuは0.01%以上含有させることが好ましく、より好ましくは0.05%以上、更に好ましくは0.1%以上とする。Niは0.01%以上含有させることが好ましく、より好ましくは0.05%以上、更に好ましくは0.1%以上とする。しかしCuとNiを過剰に含有すると熱間加工性が劣化する。従ってCuは1%以下とすることが好ましく、より好ましくは0.8%以下、更に好ましくは0.5%以下とする。Niは1%以下とすることが好ましく、より好ましくは0.8%以下、更に好ましくは0.5%以下とする。CuとNiは、単独で添加しても良いし、併用しても良い。
ェライトの生成を抑制すると共に、マルテンサイトの生成を促進する。均熱処理後は、500℃以下、380℃以上の冷却停止温度まで、平均冷却速度3℃/秒以上で冷却してから15秒以上保持することによって、マルテンサイトとベイナイトを生成させればよい。
によって、フェライトの生成を抑制し、マルテンサイトの生成を促進できる。均熱処理温度がAc3点を下回ると、フェライトが多く生成し、マルテンサイトの生成が抑制され、
強度を高めることができない。従って均熱処理温度はAc3点以上、好ましくはAc3点+10℃以上とする。しかし均熱処理温度の上限は特に限定されないが、Ac3点+70℃
を超えると、オーステナイト粒が粗大化し、曲げ加工性が悪化することがある。従って均熱処理温度はAc3点+70℃以下とすることが好ましく、より好ましくはAc3点+60℃以下とする。
れる。式中[ ]は各元素の含有量(質量%)を表し、含有しない元素については0質量%を代入して算出すればよい。この式は、「レスリー鉄鋼材料学」(丸善株式会社発行、William C. Leslie著、p273)に記載されている。
Ac3(℃)=910−203×[C]1/2−15.2×[Ni]+44.7×[Si]+104×[V]+31.5×[Mo]+13.1×[W]−{30×[Mn]+11×[Cr]+20×[Cu]−700×[P]−400×[Al]−120×[As]−400×[Ti]}・・・(i)
2に示す。
の値をZ値として下記表1に示す。
GI鋼板またはGA鋼板を構成している素地鋼板の金属組織は、板幅方向の中心位置において、板幅方向に対して垂直な断面を露出させ、この断面を研磨し、更に電解研磨した後、ナイタール腐食させたものをSEM観察した。観察位置はt/4位置(tは板厚)とし、SEMで撮影した金属組織写真を画像解析し、マルテンサイト、ベイナイト、およびフェライトの面積率を夫々測定した。
鋼板の圧延方向(L方向)と試験片の長手方向が平行になるようにJIS 13号B試験片を採取し、JIS Z2241に従って引張強度(TS)を測定した。試験片の採取位置は、鋼板の幅方向に対して中心位置(鋼板の幅方向の端面から250mm位置)と、鋼板の幅方向の端面から50mm位置の2箇所とした。測定結果を下記表2に示す。下記表2において、「中央部」とは、鋼板の幅方向の端面から50mm位置から採取した試験片を用いた結果を示しており、「端部」とは、鋼板の幅方向の端面から50mm離れた位置から採取した試験片を用いた結果を示している。
強度差率(%)=[(中央部の強度−端部の強度)/中央部の強度]×100 ・・・(ii)
鋼板の曲げ加工性は、曲げ試験の結果に基づいて評価した。
合格○)、3.0×t(tは板厚)を超える場合を曲げ加工性に劣っている(不合格×)と評価し、評価結果を下記表2に示す。
Claims (7)
- C :0.05〜0.25%(質量%の意味。以下、成分について同じ。)、
Si:0.5%以下(0%を含む)、
Mn:2.0〜4%、
P :0.1%以下(0%を含まない)、
S :0.05%以下(0%を含まない)、
Al:0.01〜0.1%、
下記式(1)を満足する量のTi、
B :0.0003〜0.005%、および
N :0.01%以下(0%を含まない)を満足し、
残部が鉄および不可避不純物からなる素地鋼板の表面に溶融亜鉛めっき層を有する溶融亜鉛めっき鋼板であり、
前記素地鋼板の金属組織は、マルテンサイト、ベイナイト、およびフェライトを有し、前記金属組織全体に対する比率は、
前記マルテンサイトは50面積%以上、
前記ベイナイトは15〜50面積%、
前記フェライトは5面積%以下(0面積%を含む)を満足する板幅方向における中央部と端部の強度差が少なく、曲げ加工性に優れた高強度溶融亜鉛めっき鋼板。
0.005×[Mn]+0.02×[B]1/2+0.025≦[Ti]≦0.15・・・(1)
[式(1)において、[ ]は各元素の含有量(質量%)を示す。] - 前記素地鋼板が、更に他の元素として、
Cr:1%以下(0%を含まない)および/または
Mo:1%以下(0%を含まない)を含有するものである請求項1に記載の高強度溶融亜鉛めっき鋼板。 - 前記素地鋼板が、更に他の元素として、
Nb:0.2%以下(0%を含まない)および/または
V :0.2%以下(0%を含まない)を含有するものである請求項1または2に記載の高強度溶融亜鉛めっき鋼板。 - 前記素地鋼板が、更に他の元素として、
Cu:1%以下(0%を含まない)および/または
Ni:1%以下(0%を含まない)を含有するものである請求項1〜3のいずれかに記載の高強度溶融亜鉛めっき鋼板。 - 請求項1〜4のいずれかに記載の高強度溶融亜鉛めっき鋼板を用いて得られるものであることを特徴とする板幅方向における中央部と端部の強度差が少なく、曲げ加工性に優れた高強度合金化溶融亜鉛めっき鋼板。
- 請求項1〜4のいずれかに記載の成分組成を満足する冷延鋼板を、Ac3点以上の温度で均熱処理した後、500℃以下、380℃以上の冷却停止温度まで、平均冷却速度3℃/秒以上で冷却してから15秒以上保持し、溶融亜鉛めっきを施すことを特徴とする板幅方向における中央部と端部の強度差が少なく、曲げ加工性に優れた高強度溶融亜鉛めっき鋼板の製造方法。
- 請求項6において、前記溶融亜鉛めっきを施した後、合金化処理を行うことを特徴とする板幅方向における中央部と端部の強度差が少なく、曲げ加工性に優れた高強度合金化溶融亜鉛めっき鋼板の製造方法。
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EP2971209A1 (en) | 2013-03-11 | 2016-01-20 | Tata Steel IJmuiden B.V. | High strength hot dip galvanised complex phase steel strip |
CN106133164A (zh) * | 2014-03-28 | 2016-11-16 | 株式会社神户制钢所 | 加工性和耐延迟断裂特性优异的高强度合金化热浸镀锌钢板及其制造方法 |
JP2019504195A (ja) * | 2015-12-15 | 2019-02-14 | ポスコPosco | 化成処理性及び曲げ加工性に優れた超高強度鋼板及びその製造方法 |
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KR101676137B1 (ko) * | 2014-12-24 | 2016-11-15 | 주식회사 포스코 | 굽힘가공성과 구멍확장성이 우수한 고강도 냉연강판, 용융아연도금강판과 그 제조방법 |
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WO2019188235A1 (ja) * | 2018-03-28 | 2019-10-03 | 株式会社神戸製鋼所 | 合金化溶融亜鉛めっき鋼板、及び合金化溶融亜鉛めっき鋼板の製造方法 |
JP7137492B2 (ja) * | 2018-03-28 | 2022-09-14 | 株式会社神戸製鋼所 | 合金化溶融亜鉛めっき鋼板、及び合金化溶融亜鉛めっき鋼板の製造方法 |
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US20150111064A1 (en) | 2015-04-23 |
KR20140129288A (ko) | 2014-11-06 |
WO2013146606A1 (ja) | 2013-10-03 |
US20190078188A1 (en) | 2019-03-14 |
JP6228741B2 (ja) | 2017-11-08 |
CN104204256A (zh) | 2014-12-10 |
CN108456831A (zh) | 2018-08-28 |
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KR101653085B1 (ko) | 2016-08-31 |
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