公开(公告)号：US06280538B1

公开(公告)日：2001-08-28

申请号：US09438374

申请日：1999-11-12

申请人： Tetsuo Soshiroda ,  Yoichi Mukai ,  Michiharu Nakaya

发明人： Tetsuo Soshiroda ,  Yoichi Mukai ,  Michiharu Nakaya

IPC分类号： C22C3802

CPC分类号： C22C38/02 ,  C21D8/0226 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/04 ,  C22C38/06 ,  Y02P10/212

摘要： A hot rolled high strength steel sheet having a satisfactory strength-elongation balance and an stretch frangibility and with excellent formability comprising a steel, which contains: C :0.05 ˜ 0.15% Si :0.5 ˜ 2.0% Mn :0.5 ˜ 2.0% P :0.05% or less S :0.010% or less Al :0.005 ˜ less than 0.10%, and the balance of Fe and inevitable impurities, and in which the metal structure mainly comprises three phases of ferrite, retained austenite and bainite, the amount of the ferrite [V(F)] is 60˜95 area %, the amount of the retained austenite [V(&ggr;)] is 3˜15 vol %, the amount of the bainite [V(B)] in the area ratio is 1.5 times or more of the amount of the retained austenite [V(&ggr;)], and the average hardness of the bainite is 240-400 Hv.

摘要翻译： 一种具有令人满意的强度 - 伸长率平衡和拉伸脆性并且具有优异的可成形性的热轧高强度钢板，其包含：余量的Fe和不可避免的杂质，其中金属结构主要包括三相铁素体 ，残留奥氏体和贝氏体，铁素体[V（F）]的含量为60〜95面积％，残留奥氏体[V（γ）]的量为3〜15体积％，贝氏体[V （B）]的面积比为残留奥氏体量[V（γ）]的1.5倍以上，贝氏体的平均硬度为240〜400Hv。

公开(公告)号：US08197617B2

公开(公告)日：2012-06-12

申请号：US12303634

申请日：2007-06-04

申请人： Michiharu Nakaya ,  Yoichi Mukai ,  Koichi Sugimoto

发明人： Michiharu Nakaya ,  Yoichi Mukai ,  Koichi Sugimoto

IPC分类号： C22C38/04 ,  C22C38/06 ,  C22C38/22

CPC分类号： C22C38/02 ,  C21D9/46 ,  C22C38/04

摘要： The present invention provides a high-strength steel sheet which has a 980 MPa class tensile strength as well as has excellent elongation, stretch flangeability and weldability, and also has excellent anti-delayed fraction property. The high-strength steel sheet comprises steel satisfying: C: 0.12 to 0.25%, Si: 1.0 to 3.0%, Mn: 1.5 to 3.0%, P: 0.15% or less, S: 0.02% or less, Al: 0.4% or less, and comprising the remnant made from iron and unavoidable impurities, wherein a ratio of the contents of Si and C (Si/C) is within the range from 7 to 14 in terms of a mass ratio, and a microstructure in a longitudinal section comprises, by an occupancy ratio based on the entire structure, 1) bainitic ferrite: 50% or more, 2) lath-type residual austenite: 3% or more, and 3) block-type residual austenite: 1% or more to ½×occupancy ratio of lath-type residual austenite, and 4) average size of block-type second phase is 10 μm or less.

摘要翻译： 本发明提供一种具有980MPa级抗拉强度以及优异的伸长率，拉伸凸缘性和焊接性的高强度钢板，并且还具有优异的抗延迟分级性能。 高强度钢板包括：C：0.12〜0.25％，Si：1.0〜3.0％，Mn：1.5〜3.0％，P：0.15％以下，S：0.02％以下，Al：0.4％ 并且包含由铁和不可避免的杂质制成的残余物，其中Si和C（Si / C）的含量比以质量比计在7至14的范围内，并且纵向截面中的微观结构 包括基于整体结构的占空比，1）贝氏体铁素体：50％以上，2）板条残余奥氏体：3％以上，3）块状残余奥氏体：1％以上〜1 / ×板条残留奥氏体的占有率，4）块状第二相的平均尺寸为10μm以下。

公开(公告)号：US20100172786A1

公开(公告)日：2010-07-08

申请号：US12303634

申请日：2007-06-04

申请人： Michiharu Nakaya ,  Yoichi Mukai ,  Koichi Sugimoto

发明人： Michiharu Nakaya ,  Yoichi Mukai ,  Koichi Sugimoto

IPC分类号： C22C38/04 ,  C22C38/06 ,  C22C38/22

CPC分类号： C22C38/02 ,  C21D9/46 ,  C22C38/04

摘要： The present invention provides a high-strength steel sheet which has a 980 MPa class tensile strength as well as has excellent elongation, stretch flangeability and weldability, and also has excellent anti-delayed fraction property. The high-strength steel sheet comprises steel satisfying: C: 0.12 to 0.25%, Si: 1.0 to 3.0%, Mn: 1.5 to 3.0%, P: 0.15% or less, S: 0.02% or less, Al: 0.4% or less, and comprising the remnant made from iron and unavoidable impurities, wherein a ratio of the contents of Si and C (Si/C) is within the range from 7 to 14 in terms of a mass ratio, and a microstructure in a longitudinal section comprises, by an occupancy ratio based on the entire structure, 1) bainitic ferrite: 50% or more, 2) lath-type residual austenite: 3% or more, and 3) block-type residual austenite: 1% or more to ½×occupancy ratio of lath-type residual austenite, and 4) average size of block-type second phase is 10 μm or less.

摘要翻译： 本发明提供一种具有980MPa级抗拉强度以及优异的伸长率，拉伸凸缘性和焊接性的高强度钢板，并且还具有优异的抗延迟分级性能。 高强度钢板包括：C：0.12〜0.25％，Si：1.0〜3.0％，Mn：1.5〜3.0％，P：0.15％以下，S：0.02％以下，Al：0.4％ 并且包含由铁和不可避免的杂质制成的残余物，其中Si和C（Si / C）的含量比以质量比计在7至14的范围内，并且纵向截面中的微观结构 包括基于整体结构的占空比，1）贝氏体铁素体：50％以上，2）板条残余奥氏体：3％以上，3）块状残余奥氏体：1％以上〜1 / ×板条残留奥氏体的占有率，4）块状第二相的平均尺寸为10μm以下。

公开(公告)号：US09464337B2

公开(公告)日：2016-10-11

申请号：US13375132

申请日：2010-05-28

申请人： Yoichi Mukai ,  Kouji Kasuya ,  Michiharu Nakaya ,  Michitaka Tsunezawa ,  Fumio Yuse ,  Junichiro Kinugasa ,  Sandra Traint ,  Andreas Pichler

发明人： Yoichi Mukai ,  Kouji Kasuya ,  Michiharu Nakaya ,  Michitaka Tsunezawa ,  Fumio Yuse ,  Junichiro Kinugasa ,  Sandra Traint ,  Andreas Pichler

IPC分类号： C21D6/00 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/00 ,  C22C38/38 ,  C21D9/46 ,  C21D8/02 ,  C22C38/02 ,  C22C38/06 ,  C22C38/14

CPC分类号： C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0252 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/38

摘要： Disclosed is a high strength steel sheet having excellent hydrogen embrittlement resistance. The steel sheet has a tensile strength of 1180 MPa or more, and satisfies the following conditions: with respect to an entire metallographic structure thereof, bainite, bainitic ferrite and tempered martensite account for 85 area % or more in total; retained austenite accounts for 1 area % or more; and fresh martensite accounts for 5 area % or less (including 0 area %).

摘要翻译： 公开了耐氢脆性优异的高强度钢板。 钢板的拉伸强度为1180MPa以上，满足以下条件：相对于其整个金相组织，贝氏体，贝氏体铁素体和回火马氏体总计占85面积％以上。 残余奥氏体占1面积％以上; 新鲜马氏体占5面积％以下（含0面积％）。

公开(公告)号：US20120132327A1

公开(公告)日：2012-05-31

申请号：US13375132

申请日：2010-05-28

申请人： Yoichi Mukai ,  Kouji Kasuya ,  Michiharu Nakaya ,  Michitaka Tsunezawa ,  Fumio Yuse ,  Junichiro Kinugasa ,  Sandra Traint ,  Andreas Pichler

发明人： Yoichi Mukai ,  Kouji Kasuya ,  Michiharu Nakaya ,  Michitaka Tsunezawa ,  Fumio Yuse ,  Junichiro Kinugasa ,  Sandra Traint ,  Andreas Pichler

IPC分类号： C21D6/00 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/00 ,  C22C38/38

CPC分类号： C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0252 ,  C21D2211/002 ,  C21D2211/005 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/38

摘要： Disclosed is a high strength steel sheet having excellent hydrogen embrittlement resistance. The steel sheet has a tensile strength of 1180 MPa or more, and satisfies the following conditions: with respect to an entire metallographic structure thereof, bainite, bainitic ferrite and tempered martensite account for 85 area % or more in total; retained austenite accounts for 1 area % or more; and fresh martensite accounts for 5 area % or less (including 0 area %).

摘要翻译： 公开了耐氢脆性优异的高强度钢板。 钢板的拉伸强度为1180MPa以上，满足以下条件：相对于其整个金相组织，贝氏体，贝氏体铁素体和回火马氏体总计占85面积％以上。 残余奥氏体占1面积％以上; 新鲜马氏体占5面积％以下（含0面积％）。

公开(公告)号：US20100221138A1

公开(公告)日：2010-09-02

申请号：US12303566

申请日：2007-06-04

申请人： Michiharu Nakaya ,  Yoichi Mukai ,  Koichi Sugimoto

发明人： Michiharu Nakaya ,  Yoichi Mukai ,  Koichi Sugimoto

IPC分类号： C22C38/28 ,  C22C38/06 ,  C22C38/18 ,  C22C38/02 ,  C22C38/04 ,  C22C38/00

CPC分类号： C22C38/04 ,  C21D9/46 ,  C22C38/02

摘要： The present invention provides a high-strength composite steel sheet which has a tensile strength of 980 MPa class as well as excellent and excellent anti-delayed fraction property, and also has excellent spot-weldability. The high-strength composite steel sheet comprises a steel satisfying: C: 0.10 to 0.25% (% by mass in case of a chemical component, the same shall apply hereinafter), Si: 1.0 to 3.0%, Mn: 1.5 to 3.0%, P: 0.15% or less, S: 0.02% or less, Al: 0.4% or less, and comprising the remnant made from iron and unavoidable impurities; the contents of Si, Al, Mn and Cr satisfy the relationship of “(Si+Al)/Mn or (Si+Al)/(Mn+Cr)=0.74 to 1.26”; and microstructure is specified.

摘要翻译： 本发明提供一种拉伸强度为980MPa等级，优异的抗延迟分级特性，且具有优异的点焊性的高强度复合钢板。 高强度复合钢板包括满足以下条件的钢：C：0.10〜0.25％（化学成分的情况下的质量％，以下相同），Si：1.0〜3.0％，Mn：1.5〜3.0％ P：0.15％以下，S：0.02％以下，Al：0.4％以下，由铁和不可避免的杂质构成的残留物; Si，Al，Mn和Cr的含量满足“（Si + Al）/ Mn或（Si + Al）/（Mn + Cr）= 0.74〜1.26”的关系。 并指定微结构。

公开(公告)号：US20140044988A1

公开(公告)日：2014-02-13

申请号：US14008875

申请日：2012-03-21

申请人： Yuichi Futamura ,  Michiharu Nakaya ,  Takayuki Kimura

发明人： Yuichi Futamura ,  Michiharu Nakaya ,  Takayuki Kimura

IPC分类号： C22C38/58 ,  C22C38/22 ,  C22C38/38 ,  C22C38/34 ,  C22C38/28 ,  C22C38/42 ,  C22C38/50 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02

CPC分类号： C23C2/40 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0247 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/28 ,  C22C38/34 ,  C22C38/38 ,  C22C38/42 ,  C22C38/50 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799

摘要： Provided are: a high-strength steel sheet which is improved in both elongation and local formability and thus exhibits excellent workability; and a manufacturing method thereof. The high-strength steel sheet contains C, Si, Mn, Al, P and S with the remainder including iron and unavoidable impurities, and has a metal structure which includes polygonal ferrite, bainite, tempered martensite, and retained austenite. In the metal structure, (1) the bainite has a composite microstructure including both a high-temperature-formed bainite having an average distance between adjacent regions of retained austenite and/or carbide of 1 μm or more and a low-temperature-formed bainite having an average distance between adjacent regions of retained austenite and/or carbide of less than 1 μm each identified upon observation with a scanning electron microscope; and (2) the retained austenite is present in a volume percentage of 5% or more of the entire metal structure as determined by a saturation magnetization measurement.

摘要翻译： 本发明提供一种提高伸长率和局部成形性的高强度钢板，由此表现出优异的可加工性; 及其制造方法。 高强度钢板含有C，Si，Mn，Al，P和S，余量包括铁和不可避免的杂质，并且具有包括多边形铁素体，贝氏体，回火马氏体和残余奥氏体的金属结构。 在金属结构中，（1）贝氏体具有复合微观结构，其包括具有残留奥氏体的相邻区域和/或1um以上的碳化物之间的平均距离的高温成形贝氏体和低温形成的贝氏体 在用扫描电子显微镜观察时，在残留奥氏体的相邻区域和/或小于1μm的碳化物之间具有平均距离; 和（2）通过饱和磁化测量确定的残余奥氏体以整个金属结构的体积百分比为5％以上存在。

公开(公告)号：US08257513B2

公开(公告)日：2012-09-04

申请号：US12671453

申请日：2008-05-28

申请人： Michiharu Nakaya ,  Tetsuji Hoshika

发明人： Michiharu Nakaya ,  Tetsuji Hoshika

IPC分类号： C22C38/00 ,  C22C38/22

CPC分类号： C22C38/02 ,  C21D1/25 ,  C21D1/26 ,  C21D8/0473 ,  C21D9/48 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04

摘要： The present invention provides a high strength steel sheet with 780 MPa class tensile strength excellent in bending workability and fatigue strength. The high strength steel sheet is (1) a steel sheet whose steel composition contains: C: 0.05-0.20%; Si: 0.6-2.0%; Mn: 1.6-3.0%; P: 0.05% or below; S: 0.01% or below; Al: 0.1% or below; and N: 0.01% or below, the balance comprising iron and inevitable impurities, in which (2) a microstructure comprises a polygonal ferrite structure and a structure formed by low-temperature transformation, in which, when a sheet plane located at a depth of 0.1 mm from a surface of the steel sheet is in the observation under a scanning electron microscope with respect to twenty sights in total in different positions in the sheet-width direction, the maximum value of the areal proportion of the polygonal ferrite (Fmax) and the minimum value of the areal proportion of the ferrite (Fmin) in a 50 μm×50 μm area in each sight satisfy Fmax≦80%, Fmin≧10%, and Fmax−Fmin≦40%.

摘要翻译： 本发明提供一种耐弯曲加工性和疲劳强度优异的780MPa级拉伸强度的高强度钢板。 高强度钢板是（1）钢组成为：C：0.05〜0.20％的钢板; Si：0.6-2.0％; Mn：1.6-3.0％ P：0.05％以下; S：0.01％以下; Al：0.1％以下; 和N：0.01％以下，余量由铁和不可避免的杂质组成，其中（2）微观结构包括多边形铁素体结构和低温变形形成的结构，其中当位于深度为 在扫描电子显微镜下，在板宽方向的不同位置上，相对于二十个视点，多边形铁素体（Fmax）的面积比例的最大值和 每个视野中的50μm×50μm面积中的铁素体（Fmin）的面积比例的最小值满足Fmax＆nlE; 80％，Fmin≥10％，Fmax-Fmin＆nlE; 40％。

公开(公告)号：US20100183472A1

公开(公告)日：2010-07-22

申请号：US12671453

申请日：2008-05-28

申请人： Michiharu Nakaya ,  Tetsuji Hoshika

发明人： Michiharu Nakaya ,  Tetsuji Hoshika

IPC分类号： C22C38/38 ,  C22C38/00 ,  C22C38/18 ,  C22C38/04

CPC分类号： C22C38/02 ,  C21D1/25 ,  C21D1/26 ,  C21D8/0473 ,  C21D9/48 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/04

摘要： The present invention provides a high strength steel sheet with 780 MPa class tensile strength excellent in bending workability and fatigue strength. The high strength steel sheet is (1) a steel sheet whose steel composition contains: C: 0.05-0.20%; Si: 0.6-2.0%; Mn: 1.6-3.0%; P: 0.05% or below; S: 0.01% or below; Al: 0.1% or below; and N: 0.01% or below, the balance comprising iron and inevitable impurities, in which (2) a microstructure comprises a polygonal ferrite structure and a structure formed by low-temperature transformation, in which, when a sheet plane located at a depth of 0.1 mm from a surface of the steel sheet is in the observation under a scanning electron microscope with respect to twenty sights in total in different positions in the sheet-width direction, the maximum value of the areal proportion of the polygonal ferrite (Fmax) and the minimum value of the areal proportion of the ferrite (Fmin) in a 50 μm×50 μm area in each sight satisfy Fmax≦80%, Fmin≧10%, and Fmax−Fmin≦40%.

摘要翻译： 本发明提供一种耐弯曲加工性和疲劳强度优异的780MPa级拉伸强度的高强度钢板。 高强度钢板是（1）钢组成为：C：0.05〜0.20％的钢板; Si：0.6-2.0％; Mn：1.6-3.0％ P：0.05％以下; S：0.01％以下; Al：0.1％以下; 和N：0.01％以下，余量由铁和不可避免的杂质组成，其中（2）微观结构包括多边形铁素体结构和低温变形形成的结构，其中当位于深度为 在扫描电子显微镜下，在板宽方向的不同位置上，相对于二十个视点，多边形铁素体（Fmax）的面积比例的最大值和 每个视野中的50μm×50μm面积中的铁素体（Fmin）的面积比例的最小值满足Fmax＆nlE; 80％，Fmin≥10％，Fmax-Fmin＆nlE; 40％。