JPWO2016194342A1 - 高強度鋼板及びその製造方法 - Google Patents
高強度鋼板及びその製造方法 Download PDFInfo
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- JPWO2016194342A1 JPWO2016194342A1 JP2017514363A JP2017514363A JPWO2016194342A1 JP WO2016194342 A1 JPWO2016194342 A1 JP WO2016194342A1 JP 2017514363 A JP2017514363 A JP 2017514363A JP 2017514363 A JP2017514363 A JP 2017514363A JP WO2016194342 A1 JPWO2016194342 A1 JP WO2016194342A1
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- chemical conversion
- steel sheet
- strength steel
- ferrite
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 123
- 239000010959 steel Substances 0.000 title claims abstract description 123
- 238000004519 manufacturing process Methods 0.000 title claims description 28
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- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims abstract description 13
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- 238000000137 annealing Methods 0.000 claims description 48
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- 239000001257 hydrogen Substances 0.000 claims description 14
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Abstract
Description
(i)面積率でフェライト:90%以上、パーライト、マルテンサイト、残留オーステナイトおよびセメンタイトの合計:0〜10%からなり、(ii)前記フェライトの平均結晶粒径が15.0μm以下であり、(iii)前記フェライトの平均アスペクト比が1.2以上である鋼組織を有し、
引張強さが500MPa以下であることを特徴とする化成処理性に優れた高強度鋼板。
[2]さらに、質量%で、Cr:0.5%未満、Mo:0.3%以下、B:0.005%以下、Cu:0.3%以下、Ni:0.3%以下のいずれか1種または2種以上を含有することを特徴とする[1]に記載の化成処理性に優れた高強度鋼板。
炉内雰囲気中の水素濃度を5〜100vol%とし、
550℃までを120℃/h以下で昇温し、
550〜750℃の温度域で均熱する
ことを特徴とする化成処理性に優れた高強度鋼板の製造方法。
本発明の高強度鋼板は、特定の成分組成と特定の鋼組織を有する。先ず、成分組成、鋼組織の順で説明する。
CがNbと結合してNbCが析出することで降伏強さと引張強さが増加する。C含有量が0.02%未満ではNbCの析出量が不足するため所望の降伏比や引張強さが得られない。C含有量が0.10%以上になるとセメンタイトが粗大化したり、パーライトやマルテンサイトが過度に生成したりするため降伏比や伸びフランジ性が低下する。このため、C含有量は0.02%以上0.10%未満とする。下限について好ましいC含有量は0.02以上である。上限について好ましいC含有量は0.06%以下である。
Siは、一般的に、フェライトを固溶強化することにより降伏強さと引張強さを増加させるのに有効であるが、Siはフェライト粒内のCを粒界に追い出す効果があるため、Siの含有により粒界に粗大なセメンタイトが形成して伸びフランジ性が劣化する。さらに、Siは焼鈍時に鋼板表層に酸化物を形成して化成処理性の劣化を招く。このためSi含有量はできるだけ低減することが好ましく、上限は0.3%未満とする。好ましくは0.1%未満とする。一方、Si含有量を0.001%未満とするためには多額の設備投資と長時間の精錬処理が必要となるため下限について好ましいSi含有量は0.001%以上である。
Mnは、フェライトの固溶強化により、降伏強さと引張強さを増加させるのに有効である。また、Mnはセメンタイトに固溶しやすく、固溶することでセメンタイトの粗大化を抑制するため優れた伸びフランジ性を得るのにも有効である。しかしながら、Mn含有量が1.0%以上になると、Mn偏析部に局所的にマルテンサイトが生成するため伸びフランジ性が劣化する。また、化成処理性の観点では、Mn酸化物は酸可溶性のため、焼鈍時に鋼板表層に酸化物を形成していても化成処理を施すときに鋼板表層から除去される。このため化成処理性に悪影響を及ぼさない場合が多い。しかし、Mn酸化物が過度に生成すると表層から完全に除去しきれず化成処理性の劣化を招く場合があるため、Mn添加量は少ないほうが好ましい。このためMn含有量は1.0%未満とする。下限について好ましいMn含有量は0.2以上である。上限について好ましいMn含有量は0.8%以下である。
Pはフェライト粒界に偏析して耐二次加工脆性を劣化させる。またPはバンド状に偏析するため伸びフランジ性も劣化させる。このためP含有量はできるだけ低減することが好ましく、上限は0.10%とする。好ましくは0.04%以下とする。さらに好ましくは0.03%以下である。なお、Pは無添加が好ましいが、製造コストの観点からは0.001%以上が好ましい。
Sは積極的に添加しなくても不純物として不可避的に含まれる場合がある元素である。MnSなどの介在物の形成により伸びフランジ性が低下するので、S含有量はできるだけ低減することが好ましい。そこで、S含有量は0.020%以下とする。好ましくは0.015%以下とする。なお、Sは無添加が好ましいが、製造コストの観点からは0.0001%以上が好ましい。
Alは精錬工程で脱酸および固溶NをAlNとして固定させるために添加される。十分な効果を得るにはAl含有量を0.01%以上にする必要がある。しかしながら、Al含有量が0.10%を超えるとAlNが粗大に析出して亀裂の起点となるため伸びフランジ性が低下する。また、Al含有量が0.10%を超えると、焼鈍時に鋼板表層に酸化物が形成して化成処理性が劣化する。したがってAl含有量は0.01〜0.10%とする。上限について好ましいAl含有量は0.07%以下とする。さらに好ましくは0.06%以下とする。
Nは溶銑の精錬工程までに不可避的に含有される元素であり、N含有量が0.010%を超えると鋳造時にNb炭窒化物として析出後、スラブ加熱でも溶解せず粗大な炭窒化物として残留し、成形時に亀裂の起点となるため伸びフランジ性が劣化する。よってN含有量は0.010%以下とする。なお、Nは無添加が好ましいが、製造コストの観点からは0.0001%以上が好ましい。
Nbはフェライト粒の微細化、Nb炭化物の析出による降伏比と引張強さの増加に寄与する重要な元素である。また、Nbを適量含有することでフェライト粒径が微細化するため耐二次加工脆性を改善する観点からも有効である。Nb含有量が0.003%未満ではNb炭化物の体積率が十分得られないので、Nbによる上記効果が小さい。また、Nb含有量が0.070%以上ではNb炭化物が過剰に析出して焼鈍後も延性に乏しい未再結晶フェライトが残存するため伸びフランジ性が劣化する。また、Nb含有量が0.070%以上では、焼鈍時に鋼板表層に酸化物を形成することがあり化成処理性の劣化を招く場合がある。このためNb含有量は0.003%以上0.070%未満とする。下限について好ましいNb含有量は0.003%以上である。上限について好ましいNb含有量は0.050%以下である。
Crは本発明の作用効果を害さない微量元素として含有してもよい。しかしながら、均熱温度を高く設定する場合に、Cr含有量が0.5%以上になると焼入性の向上によりマルテンサイトが過剰に生成して降伏比の低下を招く場合がある。また、Cr含有量が0.5%以上になると、焼鈍時に鋼板表層に酸化物を形成して化成処理性の劣化を招く。したがって、Crを含有する場合、その含有量は0.5%未満とする。また、化成処理性の観点から好ましくは0.3%未満とする。より好ましくは0.2%以下、最も好ましくは0.1%以下である。
Moは本発明の作用効果を害さない微量元素として含有してもよい。しかしながら、均熱温度を高く設定する場合に、Mo含有量が0.3%を超えると焼入性の向上によりマルテンサイトが過剰に生成して降伏比の低下を招く場合がある。また、Mo含有量が0.3%を超えると、化成処理時の化成結晶の形成速度が低下して化成処理性の劣化を招く。したがって、Moを含有する場合、その含有量を0.3%以下とする。化成処理性の観点から、さらに好ましくは0.2%以下とする。
Bは本発明の作用効果を害さない微量元素として含有してもよい。また、B含有によりフェライト粒界が強化され、耐二次加工脆性がさらに向上する場合がある。この効果を得るためにはB含有量は3質量ppm以上が好ましい。しかしながら、B含有量が0.005%を超えると焼入性の向上によりマルテンサイトが過剰に生成して降伏比の低下を招く場合がある。したがって、Bを含有する場合、その含有量を0.005%以下とする。
Cuは本発明の作用効果を害さない微量元素として含有してもよい。しかしながら、Cu含有量が0.3%を超えると焼入性の向上によりマルテンサイトが過剰に生成して降伏比の低下を招く場合がある。また、Cu含有量が0.3%を超えると、焼鈍時に鋼板表層に酸化物が形成した場合には化成処理性が劣化することがある。したがって、Cuを含有する場合、その含有量は0.3%以下とする。
Niは本発明の作用効果を害さない微量元素として含有してもよい。しかしながら、Ni含有量が0.3%を超えると焼入性の向上によりマルテンサイトが過剰に生成して降伏比の低下を招く場合がある。また、Ni含有量が0.3%を超えると、焼鈍時に鋼板表層に酸化物を形成した場合には化成処理性の劣化を招くことがある。したがって、Niを含有する場合、その含有量を0.3%以下とする。
フェライトは良好な延性を有する。本発明が目的とする高降伏比、優れた伸びフランジ性及び優れた耐二次加工脆性の全てを満たすために、本発明ではフェライトを主相として面積率で90%以上含有する必要がある。フェライトの含有量が90%未満では、本発明が目的とする上記の特性が得られない。よってフェライトは面積率で90%以上とする。好ましくは95%以上とする。
パーライト、マルテンサイト、残留オーステナイトおよびセメンタイトの1種以上を含有することで引張強さと降伏強さがさらに増加する。また、これらを面積率の合計で0〜10%含有しても本発明が目的とする特性を得ることができる。しかしながら、パーライト、マルテンサイト、残留オーステナイトおよびセメンタイトの合計が面積率で10%を超えると伸びフランジ性や耐二次加工脆性が劣化する。そこで、パーライト、マルテンサイト、残留オーステナイトおよびセメンタイトの合計は面積率で0〜10%とする。好ましくは0〜5%とする。なお、フェライトの面積率が100%でも所望の強度を得ることは可能であり、上記組織の合計面積率は0%でも構わない。
フェライトの平均結晶粒径は本発明が目的とする優れた耐二次加工脆性と0.70以上の高降伏比を得るために重要である。しかしながら、フェライトの平均結晶粒径が15.0μmを超えると、0.70以上の降伏比が得られず、耐二次加工脆性も劣化する。このため、フェライトの平均結晶粒径は15.0μm以下とする。好ましくは10.0μm以下とする。また、フェライトの平均結晶粒径が5μm未満になると降伏比や引張強さが過度に増加したり成形性が劣化する場合があるので、5μm以上が好ましい。
フェライトの平均アスペクト比は優れた伸びフランジ性と耐二次加工脆性を得るうえで重要である。詳しい理由は不明であるが、亀裂が板厚方向に貫通するまで成形する穴広げ試験において、圧延方向の結晶粒長さに比べて板厚方向の結晶粒長さが短くなると、平均結晶粒径が同等の場合、亀裂進展の障害となる結晶粒界が増加するために伸びフランジ性が向上するものと考えられる。フェライトの平均アスペクト比が1.2未満ではこの効果は小さい。このためフェライトの平均アスペクト比は1.2以上とする。好ましくは1.4以上とする。また、このような効果はフェライトの平均アスペクト比を大きくしても飽和するので10.0以下でよい。なお、本発明におけるフェライトは再結晶フェライトである。
箱焼鈍炉内雰囲気中の水素濃度は本発明が目的とする優れた化成処理性を得るために重要な製造条件である。鋼鈑表面にSiやMnなどの酸化物が生成した部位では化成結晶が形成されないのでスケが発生する。水素濃度が5vol%未満では、鋼板表層に酸化物が形成するので化成処理性が劣化する。また、水素濃度が5vol%未満では、スケールが形成してテンパーカラーなどの外観の劣化が生じる。また表面に酸化物を有する鋼鈑を下地鋼鈑としてめっきを施すと酸化物が生成した部位でめっきに被覆されない不めっき部が生じる。めっき鋼鈑であってもこのような部位では化成処理時にスケとなるため化成処理性は劣位である。このため、炉内雰囲気中の水素濃度は5vol%以上にする必要がある。鋼板表層の酸化物の形成を完全に抑制するため炉内雰囲気中の水素濃度を10vol%以上とすることが好ましい。鋼板表層の酸化物の形成を完全に抑制するため炉内雰囲気中の水素濃度を50vol%以上とすることがより好ましい。更には、鋼板表層の酸化物の形成を完全に抑制するため炉内雰囲気中の水素濃度を90vol%以上とすることがより好ましい。また、上限は100vol%である。残部は不活性ガスであることが好ましく、窒素(N2)やアルゴン(Ar)などを用いることができる。なお、上記炉内雰囲気には一酸化炭素(CO)や二酸化炭素(CO2)等を含んでもよい。
冷間圧延鋼板の加熱における、室温から550℃までの平均昇温速度は、焼鈍後に、所望の微細で圧延方向に伸長したフェライト粒を得るうえで重要な製造条件である。550℃までの昇温速度が120℃/hを超えると、フェライト粒の平均アスペクト比が1.2未満となるため伸びフランジ性と耐二次加工脆性が劣化する。このため550℃までの昇温速度は120℃/h以下とする。好ましくは100℃/h以下とする。また、昇温速度は鋼鈑特性上の理由からの上限は無いが、生産性の観点からは10℃/h以上が好ましい。なお、550℃以上の温度まで加熱する場合に、550℃以上の領域の平均昇温速度は、特に限定されず、120℃/h以下であってもよいし、120℃/h超であってもよい。
均熱温度はフェライト粒径を制御する上で重要な要件である。均熱温度が550℃未満ではフェライトの再結晶が不十分となり伸びフランジ性が劣化する。均熱温度が750℃を超えるとフェライト粒やNb炭化物が粗大化するため本発明が目的とする引張強さ、高降伏比および優れた伸びフランジ性と耐二次加工脆性が得られない。このため均熱温度は550〜750℃とする。下限について、好ましい均熱温度は600以上である。上限について好ましい均熱温度は700℃以下である。均熱時間は特に限定されるものではないが、フェライトを完全に再結晶させるため1時間以上とすることが好ましく、フェライト粒の過度な粗大化を抑制するため60時間以下とするのが好ましい。なお、均熱時間は、均熱温度が上記温度範囲(550〜750℃、好ましくは600〜700℃)の状態にある時間であり、定温保持でなくてもよい。なお、化成処理性の観点からは、鋼板表層の酸化物生成を抑制するため均熱温度は低いほど好ましい。
Claims (9)
- 質量%で、C:0.02%以上0.10%未満、Si:0.3%未満、Mn:1.0%未満、P:0.10%以下、S:0.020%以下、Al:0.01〜0.10%、N:0.010%以下、Nb:0.003%以上0.070%未満を含有し、残部がFeおよび不可避的不純物からなる成分組成と、
(i)面積率でフェライト:90%以上、パーライト、マルテンサイト、残留オーステナイトおよびセメンタイトの合計:0〜10%からなり、(ii)前記フェライトの平均結晶粒径が15.0μm以下であり、(iii)前記フェライトの平均アスペクト比が1.2以上である鋼組織を有し、
引張強さが500MPa以下であることを特徴とする化成処理性に優れた高強度鋼板。 - さらに、質量%で、Cr:0.5%未満、Mo:0.3%以下、B:0.005%以下、Cu:0.3%以下、Ni:0.3%以下のいずれか1種または2種以上を含有することを特徴とする請求項1に記載の化成処理性に優れた高強度鋼板。
- 表面に溶融亜鉛めっき層を有することを特徴とする請求項1または2に記載の化成処理性に優れた高強度鋼板。
- 前記溶融亜鉛めっき層が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3に記載の化成処理性に優れた高強度鋼板。
- 表面に電気亜鉛めっき層を有することを特徴とする請求項1または2に記載の化成処理性に優れた高強度鋼板。
- 請求項1または2に記載の高強度鋼板の製造方法であって、
冷間圧延鋼板を箱焼鈍炉で焼鈍するにあたり、
炉内雰囲気中の水素濃度を5〜100vol%とし、
550℃までを120℃/h以下で昇温し、
550〜750℃の温度域で均熱することを特徴とする化成処理性に優れた高強度鋼板の製造方法。 - 前記焼鈍後に、溶融亜鉛めっきを施すことを特徴とする請求項6に記載の化成処理性に優れた高強度鋼板の製造方法。
- 前記溶融亜鉛めっきを施した後、溶融亜鉛めっきに合金化処理を施すことを特徴とする請求項7に記載の化成処理性に優れた高強度鋼板の製造方法。
- 前記焼鈍後に、電気亜鉛めっきを施すことを特徴とする請求項6に記載の化成処理性に優れた高強度鋼板の製造方法。
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US10801085B2 (en) | 2020-10-13 |
EP3305932A4 (en) | 2018-04-11 |
WO2016194342A1 (ja) | 2016-12-08 |
US20180291476A1 (en) | 2018-10-11 |
CN107614729B (zh) | 2019-09-20 |
EP3305932A1 (en) | 2018-04-11 |
CN107614729A (zh) | 2018-01-19 |
JP6210179B2 (ja) | 2017-10-11 |
MX2017015325A (es) | 2018-03-16 |
KR102074344B1 (ko) | 2020-02-06 |
EP3305932B1 (en) | 2020-02-12 |
KR20170140358A (ko) | 2017-12-20 |
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