JP7238129B2 - 高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板及びその製造方法 - Google Patents
高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板及びその製造方法 Download PDFInfo
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Description
米国特許公開第US20180023155A1号は、伸び率および穴拡げ率が優れた980MPa以上級の超高強度冷間圧延鋼板およびその製造方法を開示している。そのうち、C:0.1-0.5%、Si:0.8-4.0%、Mn:1.0-4.0%、P:0.015%以下、S:0.005%以下、Al:0-2%、N:0.01%以下、Ti:0.02-0.15%であり、さらに他の元素も添加できる。最終組織には、フェライト相、ベイナイト相、及びマルテンサイト相が含まれている必要があり、かつ10~25%の残留オーステナイト相が含まれている必要がある。その独自性は、Siの添加によって残留オーステナイトを得て優れた伸び率および穴拡げ率が得られ、かつ980MPaの穴拡げ率が30%以上にしか到達できないことにある。
本発明の鋼設計の組成は、主にC+Mn+Cr+Mo+Tiで構成される組成系であり、C、Mn、Cr、およびMoの協調設計により、熱間圧延と巻き取りの後に拡散型相変態-フェライト変態を確実に発生させ、多数の相間ナノ析出物を生成するとともに、ベイナイトC曲線が左にシフトし、最終的なベイナイトの体積分率含有量が30%を超えることを確保しながら、特定の焼入れ性を確保して最終組織のマルテンサイトの体積分率含有量が15%を超えることを確保する。
本発明の冷間圧延鋼板のミクロ組織はフェライト+ベイナイト+マルテンサイトに加えて、均一かつ分散して(即ち、散らばって)分布するナノスケールの析出物が含まれ、そのうち、ベイナイトの体積分率含有量が30%超え、マルテンサイトの体積分率含有量が15%超え、析出物の平均サイズが20nm未満である。一般に、本発明の冷間圧延鋼板のミクロ組織において、マルテンサイトの体積分率含有量の上限が35%、フェライトの体積分率含有量の上限が30%、ベイナイトの体積分率含有量の上限が75%である。好ましくは、本発明の鋼板のミクロ組織において、ベイナイトの体積分率含有量が35%超え、マルテンサイトの体積分率含有量が20%超えである。いくつかの実施形態では、本発明の冷間圧延鋼板のミクロ組織におけるベイナイトの体積分率含有量が35%超え、マルテンサイトの体積分率含有量が15%超えである。好ましくは、本発明の冷間圧延鋼板のミクロ組織において、マルテンサイトの体積分率含有量が15%超えかつ35%以下、より好ましくは20~35%であり;フェライトの体積分率含有量が10%超えかつ30%以下であり;ベイナイトの体積分率含有量が30%超えかつ75%以下、より好ましくは35~75%である。本発明の冷間圧延鋼板は、ミクロ組織中に残留オーステナイトを含まない。
C:本発明の鋼板において、C元素の添加は、鋼の強度を高め、マルテンサイト相変態の発生およびナノ析出物の生成を確保するように機能する。C含有量は、0.08%~0.12%の間で選択され、その理由は、C含有量が0.08%未満であると、焼鈍過程中に十分なベイナイトとマルテンサイトが生成されることを確保できないためであり、十分なナノ析出物が析出することを確保できないと、鋼板の強度に影響する。一方、C含有量が0.12%を超えると、マルテンサイト硬度が高すぎて結晶粒径が粗くなり、鋼板の成形性に不利であり、熱間圧延と巻き取り後にフェライト相変態が起こりにくくなり、ナノ析出物が生成することができない。好ましくは、C含有量は、0.08%~0.1%、または0.09~0.11%である。
2)熱間圧延:最初に1150~1250℃に加熱し、0.5時間以上保持してから、
Ar3以上の温度で熱間圧延し、圧延後に30~100℃/sの速度で急速に冷却し、巻取り温度:600~750℃である;
3)冷間圧延:冷間圧延の圧下率が30~70%、好ましくは50~70%に制御される;
4)焼鈍:焼鈍均熱温度が810~870℃、好ましくは830~860℃であり、均熱保持時間が50~100秒であり、その後、3~10℃/秒の速度で急冷開始温度である660~730℃まで冷却し、その後に30~200℃/sの速度で200~460℃(急冷終了温度)まで冷却する;
5)過時効:過時効温度が320~460℃、過時効時間が100~400秒である。
熱間圧延工程において、保持時間は通常0.5時間以上、好ましくは0.5~3時間である。いくつかの実施形態では、保持時間は0.8~1.5時間である。
(1)製錬と鋳造:必要な合金組成を取得し、S及びPの含有量を最大限度に低減した。
(4)焼鈍:焼鈍均熱温度が810~870℃、好ましくは830~860℃であり、均熱保持時間が50~100秒であり、その後、v1=3~10℃/秒の速度で急冷開始温度である660~730℃まで冷却し、その後にv2=30~200℃/sの速度で200~460℃まで冷却した。
Claims (13)
- 化学成分の質量百分率が、C:0.08%~0.12%、Si:0.1%~1.0%、Mn:1.9%~2.6%、Al:0.01%~0.05%、Cr:0.1~0.55%、Mo:0.1~0.5%、Ti:0.01~0.1%であり、残部がFe及び不可避不純物であり、さらに、以下の関係:
1.8≧5×[C]+0.4×[Si]+0.1×([Mn]+[Cr]+[Mo])2≧1.3,[Mo]≧3×[Ti]
を満足し、
前記冷間圧延鋼板のミクロ組織がフェライト+ベイナイト+マルテンサイトであり、前記ミクロ組織中に残留オーステナイトを含まず、そのうち、フェライトの体積分率含有量が10%超え、ベイナイトの体積分率含有量が30%超え、マルテンサイトの体積分率含有量が15%超えであり、前記ミクロ組織には、均一かつ分散して分布するナノスケールの析出物がさらに含まれており、析出物の平均サイズが20nm未満であり、
前記冷間圧延鋼板は、降伏強度が600MPa超え、引張強度が980MPa超え、伸び率が11%超え、穴拡げ率が45%以上であることを特徴とする、高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板。 - 前記Cの含有量が0.09%~0.11%であることを特徴とする請求項1に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板。
- 前記Siの含有量が0.4%~0.8%であることを特徴とする請求項1に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板。
- 前記Mnの含有量が2.1%~2.4%であることを特徴とする請求項1に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板。
- 前記Alの含有量が0.015~0.045%であることを特徴とする請求項1に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板。
- 前記Crの含有量が0.2%~0.4%であることを特徴とする請求項1に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板。
- 前記Moの含有量が0.2%~0.3%であることを特徴とする請求項1に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板。
- 前記Ti含有量が0.02%~0.05%であることを特徴とする請求項1に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板。
- 1.45≦5×[C]+0.4×[Si]+0.1×([Mn]+[Cr]+[Mo])2≦1.7を満足することを特徴とする請求項1に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板。
- 前記冷間圧延鋼板のミクロ組織がフェライト+ベイナイト+マルテンサイトであり、そのうち、フェライトの体積分率含有量が10%超えかつ30%以下であり、ベイナイトの体積分率含有量が35%~75%であり、マルテンサイトの体積分率含有量が15%超えかつ35%以下であることを特徴とする請求項1に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板。
- 以下の工程:
1)製錬、鋳造:請求項1~9のいずれか一項に記載の組成に従って製錬し、ビレットに鋳造する;
2)熱間圧延:最初に1150~1250℃に加熱し、0.5時間以上保持してから、Ar3以上の温度で熱間圧延し、圧延後に30~100℃/sの速度で急速に冷却し、巻取り温度が600~750℃である;
3)冷間圧延:冷間圧延の圧下率が30~70%に制御される;
4)焼鈍:焼鈍均熱温度が810~870℃であり、均熱保持時間が50~100秒であり、その後、3~10℃/秒の速度で660~730℃である急冷開始温度まで冷却し、その後に30~200℃/sの速度で200~460℃まで冷却する;
5)過時効:過時効温度が320~460℃、過時効時間が100~400秒である、
を含むことを特徴とする、請求項1~10のいずれか一項に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板の製造方法。 - 0.05~0.3%のレベリング率で行う工程6)レベリングをさらに含むことを特徴とする請求項11に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板の製造方法。
- 工程2)において、保持時間が0.5~3時間であり;
工程3)において、冷間圧延の圧下率が50~70%に制御され;
工程4)において、焼鈍温度が820~870℃であり、均熱保持時間が50~90秒であり、50~200℃/sの速度で320~460℃まで冷却されることを特徴とする請求項11に記載の高穴拡げ率と高伸び率を有する980MPa級冷間圧延鋼板の製造方法。
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US20230313332A1 (en) * | 2020-08-31 | 2023-10-05 | Baoshan Iron & Steel Co., Ltd. | High-strength low-carbon martensitic high hole expansion steel and manufacturing method therefor |
CN114107795B (zh) * | 2020-08-31 | 2023-05-09 | 宝山钢铁股份有限公司 | 一种1180MPa级低温回火马氏体高扩孔钢及其制造方法 |
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Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004068050A (ja) | 2002-08-02 | 2004-03-04 | Sumitomo Metal Ind Ltd | 高張力冷延鋼板及びその製造方法 |
JP2006219741A (ja) | 2005-02-14 | 2006-08-24 | Nippon Steel Corp | 部材内硬さの均一性に優れた高強度自動車用部材およびその製造方法 |
JP2010526935A (ja) | 2007-05-11 | 2010-08-05 | アルセロールミタル・フランス | 極めて高い強度を有する冷延焼鈍鋼板を製造するプロセスおよびこれにより製造された板 |
JP2011132602A (ja) | 2009-11-30 | 2011-07-07 | Nippon Steel Corp | 高強度冷延鋼板、高強度溶融亜鉛めっき鋼板および高強度合金化溶融亜鉛めっき鋼板 |
US20150041024A1 (en) | 2012-01-30 | 2015-02-12 | Salzgitter Flachstahl Gmbh | Ultrahigh-strength multiphase steel with improved properties during production and processing |
WO2015162849A1 (ja) | 2014-04-22 | 2015-10-29 | Jfeスチール株式会社 | 高強度溶融亜鉛めっき鋼板および高強度合金化溶融亜鉛めっき鋼板の製造方法 |
CN105734410A (zh) | 2014-12-24 | 2016-07-06 | Posco公司 | 弯曲加工性及扩孔性优异的高强度冷轧钢板、熔融镀锌钢板及其制造方法 |
WO2016152163A1 (ja) | 2015-03-25 | 2016-09-29 | Jfeスチール株式会社 | 冷延鋼板およびその製造方法 |
WO2018193787A1 (ja) | 2017-04-21 | 2018-10-25 | 新日鐵住金株式会社 | 高強度溶融亜鉛めっき鋼板およびその製造方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005213640A (ja) * | 2004-02-02 | 2005-08-11 | Kobe Steel Ltd | 伸び及び伸びフランジ性に優れた高強度冷延鋼板とその製法 |
JP5438302B2 (ja) * | 2008-10-30 | 2014-03-12 | 株式会社神戸製鋼所 | 加工性に優れた高降伏比高強度の溶融亜鉛めっき鋼板または合金化溶融亜鉛めっき鋼板とその製造方法 |
KR101570593B1 (ko) * | 2011-04-21 | 2015-11-19 | 신닛테츠스미킨 카부시키카이샤 | 균일 연신율과 구멍 확장성이 우수한 고강도 냉연 강판 및 그 제조 방법 |
US9115416B2 (en) * | 2011-12-19 | 2015-08-25 | Kobe Steel, Ltd. | High-yield-ratio and high-strength steel sheet excellent in workability |
JP5857909B2 (ja) * | 2012-08-09 | 2016-02-10 | 新日鐵住金株式会社 | 鋼板およびその製造方法 |
WO2015088523A1 (en) * | 2013-12-11 | 2015-06-18 | ArcelorMittal Investigación y Desarrollo, S.L. | Cold rolled and annealed steel sheet |
US10876181B2 (en) | 2015-02-24 | 2020-12-29 | Nippon Steel Corporation | Cold-rolled steel sheet and method of manufacturing same |
CN107406937B (zh) * | 2015-03-06 | 2019-10-25 | 杰富意钢铁株式会社 | 高强度钢板及其制造方法 |
EP3467135B1 (en) * | 2016-08-10 | 2020-09-23 | JFE Steel Corporation | Thin steel sheet, and production method therefor |
KR101858852B1 (ko) | 2016-12-16 | 2018-06-28 | 주식회사 포스코 | 항복강도, 연성 및 구멍확장성이 우수한 고강도 냉연강판, 용융아연도금강판 및 이들의 제조방법 |
CN108193139B (zh) * | 2018-02-23 | 2019-09-10 | 唐山钢铁集团有限责任公司 | 1180MPa级汽车用冷轧高强双相钢及其生产方法 |
CN109576579A (zh) * | 2018-11-29 | 2019-04-05 | 宝山钢铁股份有限公司 | 一种具有高扩孔率和较高延伸率的980MPa级冷轧钢板及其制造方法 |
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2019
- 2019-11-11 CN CN201911094910.XA patent/CN111235470A/zh active Pending
- 2019-11-29 EP EP19889858.7A patent/EP3889287B1/en active Active
- 2019-11-29 KR KR1020217016924A patent/KR20210095156A/ko active Search and Examination
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- 2019-11-29 US US17/296,303 patent/US20220010401A1/en active Pending
- 2019-11-29 WO PCT/CN2019/121868 patent/WO2020108597A1/zh active Application Filing
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004068050A (ja) | 2002-08-02 | 2004-03-04 | Sumitomo Metal Ind Ltd | 高張力冷延鋼板及びその製造方法 |
JP2006219741A (ja) | 2005-02-14 | 2006-08-24 | Nippon Steel Corp | 部材内硬さの均一性に優れた高強度自動車用部材およびその製造方法 |
JP2010526935A (ja) | 2007-05-11 | 2010-08-05 | アルセロールミタル・フランス | 極めて高い強度を有する冷延焼鈍鋼板を製造するプロセスおよびこれにより製造された板 |
JP2011132602A (ja) | 2009-11-30 | 2011-07-07 | Nippon Steel Corp | 高強度冷延鋼板、高強度溶融亜鉛めっき鋼板および高強度合金化溶融亜鉛めっき鋼板 |
US20150041024A1 (en) | 2012-01-30 | 2015-02-12 | Salzgitter Flachstahl Gmbh | Ultrahigh-strength multiphase steel with improved properties during production and processing |
WO2015162849A1 (ja) | 2014-04-22 | 2015-10-29 | Jfeスチール株式会社 | 高強度溶融亜鉛めっき鋼板および高強度合金化溶融亜鉛めっき鋼板の製造方法 |
CN105734410A (zh) | 2014-12-24 | 2016-07-06 | Posco公司 | 弯曲加工性及扩孔性优异的高强度冷轧钢板、熔融镀锌钢板及其制造方法 |
WO2016152163A1 (ja) | 2015-03-25 | 2016-09-29 | Jfeスチール株式会社 | 冷延鋼板およびその製造方法 |
WO2018193787A1 (ja) | 2017-04-21 | 2018-10-25 | 新日鐵住金株式会社 | 高強度溶融亜鉛めっき鋼板およびその製造方法 |
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