公开(公告)号：US09139885B2

公开(公告)日：2015-09-22

申请号：US13822746

申请日：2011-09-16

申请人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Naoki Yoshinaga ,  Chisato Wakabayashi ,  Noriyuki Suzuki

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Naoki Yoshinaga ,  Chisato Wakabayashi ,  Noriyuki Suzuki

IPC分类号： C21D8/02 ,  C22C38/40 ,  C25D5/10 ,  B32B15/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/38 ,  C23C2/06 ,  C23C2/40 ,  C22C38/04 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/34 ,  C22C38/58 ,  C23C2/02 ,  C23C2/28 ,  C25D3/22 ,  C25D5/36 ,  C25D5/50 ,  C25D3/56

CPC分类号： C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C25D3/22 ,  C25D3/565 ,  C25D5/36 ,  C25D5/50

摘要： This high-strength steel sheet includes by mass percentage: 0.05 to 0.4% of C; 0.1 to 2.5% of Si; 1.0 to 3.5% of Mn; 0.001 to 0.03% of P; 0.0001 to 0.01% of S; 0.001 to 2.5% of Al; 0.0001 to 0.01% of N; 0.0001 to 0.008% of O; and a remainder composed of iron and inevitable impurities, wherein a steel sheet structure contains by volume fraction 10 to 50% of a ferrite phase, 10 to 50% of a tempered martensite phase, and a remaining hard phase, wherein a 98% hardness is 1.5 or more times as high as a 2% hardness in a range from ⅛ to ⅜ of a thickness of the steel sheet, wherein a kurtosis K* of the hardness distribution between the 2% hardness and the 98% hardness is −1.2 to −0.4, and wherein an average crystal grain size in the steel sheet structure is 10 μm or less.

摘要翻译： 该高强度钢板以质量百分比计：C：0.05〜0.4％ 0.1〜2.5％的Si; 1.0〜3.5％的Mn; 0.001〜0.03％P; 0.0001〜0.01％的S; 0.001〜2.5％的Al; 0.0001〜0.01％N; 0.0001〜0.008％的O; 余量由铁和不可避免的杂质组成，其中钢板结构体积体积分数为铁素体相10-50％，回火马氏体相为10-50％，剩余硬质相为98％ 在钢板厚度的⅛至⅛范围内的2％硬度的1.5倍以上，2％硬度与98％硬度之间的硬度分布的峰度K *为-1.2〜 0.4，其中，钢板结构体的平均结晶粒径为10μm以下。

公开(公告)号：US20130167980A1

公开(公告)日：2013-07-04

申请号：US13822746

申请日：2011-09-16

申请人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Naoki Yoshinaga ,  Chisato Wakabayashi ,  Noriyuki Suzuki

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Naoki Yoshinaga ,  Chisato Wakabayashi ,  Noriyuki Suzuki

IPC分类号： C21D8/02 ,  C22C38/40 ,  C22C38/38 ,  C22C38/34 ,  C22C38/16 ,  C22C38/00 ,  C22C38/12 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/58 ,  C22C38/14

CPC分类号： C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/34 ,  C22C38/38 ,  C22C38/40 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C25D3/22 ,  C25D3/565 ,  C25D5/36 ,  C25D5/50

摘要： This high-strength steel sheet includes by mass percentage: 0.05 to 0.4% of C; 0.1 to 2.5% of Si; 1.0 to 3.5% of Mn; 0.001 to 0.03% of P; 0.0001 to 0.01% of S; 0.001 to 2.5% of Al; 0.0001 to 0.01% of N; 0.0001 to 0.008% of O; and a remainder composed of iron and inevitable impurities, wherein a steel sheet structure contains by volume fraction 10 to 50% of a ferrite phase, 10 to 50% of a tempered martensite phase, and a remaining hard phase, wherein a 98% hardness is 1.5 or more times as high as a 2% hardness in a range from ⅛ to ⅜ of a thickness of the steel sheet, wherein a kurtosis K* of the hardness distribution between the 2% hardness and the 98% hardness is −1.2 to −0.4, and wherein an average crystal grain size in the steel sheet structure is 10 μm or less.

摘要翻译： 该高强度钢板以质量百分比计：C：0.05〜0.4％ 0.1〜2.5％的Si; 1.0〜3.5％的Mn; 0.001〜0.03％P; 0.0001〜0.01％的S; 0.001〜2.5％的Al; 0.0001〜0.01％N; 0.0001〜0.008％的O; 余量由铁和不可避免的杂质组成，其中钢板结构体积体积分数为铁素体相10-50％，回火马氏体相为10-50％，剩余硬质相为98％ 在钢板厚度的1/8至3/8的范围内的2％硬度的1.5倍或更多倍，其中2％硬度和98％硬度之间的硬度分布的峰度K *为 -1.2〜-0.4，钢板结构体的平均结晶粒径为10μm以下。

公开(公告)号：US20110024004A1

公开(公告)日：2011-02-03

申请号：US12736417

申请日：2009-04-09

申请人： Masafumi Azuma ,  Noriyuki Suzuki ,  Naoki Maruyama ,  Naoki Yoshinaga ,  Akinobu Murasato

发明人： Masafumi Azuma ,  Noriyuki Suzuki ,  Naoki Maruyama ,  Naoki Yoshinaga ,  Akinobu Murasato

IPC分类号： C21D8/02 ,  C22C38/00 ,  C22C38/18 ,  C22C38/16 ,  C22C38/08

CPC分类号： C23C2/28 ,  C21D8/0236 ,  C21D8/0273 ,  C21D9/46 ,  C21D9/48 ,  C21D2201/05 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C23C2/02 ,  C23C2/06

摘要： The invention is directed to providing, for application in automobiles, construction materials, household appliances and the like, high-strength sheets excellent in formability properties such as hole expansibility and ductility, and also in fatigue resistance, characterized in comprising, in specified contents expressed in mass %, C, Si, Mn, P, S, Al, N and O and a balance of iron and unavoidable impurities, and having a steel sheet structure composed mainly of ferrite and hard structures, a crystal orientation difference between some ferrite adjacent to hard structures and the hard structures of less than 9°, and a maximum tensile strength of 540 MPa or greater.

摘要翻译： 本发明旨在提供在汽车，建筑材料，家用电器等中的应用，具有优异的成型性能如扩孔性和延展性以及耐疲劳性的高强度片材，其特征在于，在特定内容中表达 以质量％计，C，Si，Mn，P，S，Al，N和O以及铁和不可避免的杂质的平衡，并且具有主要由铁素体和硬质结构组成的钢板结构，一些铁素体相邻的晶体取向差异 硬结构和硬结构小于9°，最大拉伸强度为540MPa或更大。

公开(公告)号：US08460481B2

公开(公告)日：2013-06-11

申请号：US12736417

申请日：2009-04-09

申请人： Masafumi Azuma ,  Noriyuki Suzuki ,  Naoki Maruyama ,  Naoki Yoshinaga ,  Akinobu Murasato

发明人： Masafumi Azuma ,  Noriyuki Suzuki ,  Naoki Maruyama ,  Naoki Yoshinaga ,  Akinobu Murasato

IPC分类号： C22C38/02 ,  C22C38/04 ,  C21D8/04 ,  C23C2/06

CPC分类号： C23C2/28 ,  C21D8/0236 ,  C21D8/0273 ,  C21D9/46 ,  C21D9/48 ,  C21D2201/05 ,  C21D2211/004 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C23C2/02 ,  C23C2/06

摘要： The invention is directed to providing, for application in automobiles, construction materials, household appliances and the like, high-strength sheets excellent in formability properties such as hole expansibility and ductility, and also in fatigue resistance, characterized in comprising, in specified contents expressed in mass %, C, Si, Mn, P, S, Al, N and O and a balance of iron and unavoidable impurities, and having a steel sheet structure composed mainly of ferrite and hard structures, a crystal orientation difference between some ferrite adjacent to hard structures and the hard structures of less than 9°, and a maximum tensile strength of 540 MPa or greater.

摘要翻译： 本发明旨在提供在汽车，建筑材料，家用电器等中的应用，具有优异的成型性能如扩孔性和延展性以及耐疲劳性的高强度片材，其特征在于，在特定内容中表达 以质量％计，C，Si，Mn，P，S，Al，N和O以及铁和不可避免的杂质的平衡，并且具有主要由铁素体和硬质结构组成的钢板结构，一些铁素体相邻的晶体取向差异 硬结构和硬结构小于9°，最大拉伸强度为540MPa或更大。

公开(公告)号：US08070889B2

公开(公告)日：2011-12-06

申请号：US12736417

申请日：2009-04-09

申请人： Masafumi Azuma ,  Noriyuki Suzuki ,  Naoki Maruyama ,  Naoki Yoshinaga ,  Akinobu Murasato

发明人： Masafumi Azuma ,  Noriyuki Suzuki ,  Naoki Maruyama ,  Naoki Yoshinaga ,  Akinobu Murasato

IPC分类号： C22C38/02 ,  C22C38/04 ,  C21D8/04 ,  C23C2/06

摘要： The invention is directed to providing, for application in automobiles, construction materials, household appliances and the like, high-strength sheets excellent in formability properties such as hole expansibility and ductility, and also in fatigue resistance, characterized in comprising, in specified contents expressed in mass %, C, Si, Mn, P, S, Al, N and O and a balance of iron and unavoidable impurities, and having a steel sheet structure composed mainly of ferrite and hard structures, a crystal orientation difference between some ferrite adjacent to hard structures and the hard structures of less than 9°, and a maximum tensile strength of 540 MPa or greater.

公开(公告)号：US20130037180A1

公开(公告)日：2013-02-14

申请号：US13574096

申请日：2011-01-26

申请人： Kohichi Sano ,  Chisato Wakabayashi ,  Hiroyuki Kawata ,  Riki Okamoto ,  Naoki Yoshinaga ,  Kaoru Kawasaki ,  Natsuko Sugiura ,  Nobuhiro Fujita

发明人： Kohichi Sano ,  Chisato Wakabayashi ,  Hiroyuki Kawata ,  Riki Okamoto ,  Naoki Yoshinaga ,  Kaoru Kawasaki ,  Natsuko Sugiura ,  Nobuhiro Fujita

IPC分类号： C21D9/46 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/34 ,  C22C38/14 ,  C22C38/22 ,  C22C38/20 ,  C22C38/32 ,  C22C38/58 ,  C22C38/40 ,  C22C38/12 ,  C21D8/02 ,  C22C38/38

CPC分类号： C22C38/02 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/48 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/06 ,  C23C2/04 ,  C23C2/26 ,  C23C2/28

摘要： A high-strength cold-rolled steel sheet includes, by mass %, C: 0.10% to 0.40%, Mn: 0.5% to 4.0%, Si: 0.005% to 2.5%, Al: 0.005% to 2.5%, Cr: 0% to 1.0%, and a balance of iron and inevitable impurities, in which an amount of P is limited to 0.05% or less, an amount of S is limited to 0.02% or less, an amount of N is limited to 0.006% or less, the microstructure includes 2% to 30% of retained austenite by area percentage, martensite is limited to 20% or less by area percentage in the microstructure, an average particle size of cementite is 0.01 μm to 1 μm, and 30% to 100% of the cementite has an aspect ratio of 1 to 3.

摘要翻译： 高强度冷轧钢板以质量％计含有C：0.10％至0.40％，Mn：0.5％至4.0％，Si：0.005％至2.5％，Al：0.005％至2.5％，Cr：0 ％至1.0％，其中P含量限制在0.05％以下的铁和不可避免的杂质的余量，S的量限制在0.02％以下，N的量限定为0.006％，或者 微观结构中的残余奥氏体的面积率为2％〜30％，微观结构中的面积百分比将马氏体限制在20％以下，渗碳体的平均粒径为0.01μm〜1μm，30％〜100％ 渗碳体的％的纵横比为1〜3。

公开(公告)号：US08951366B2

公开(公告)日：2015-02-10

申请号：US13574096

申请日：2011-01-26

申请人： Kohichi Sano ,  Chisato Wakabayashi ,  Hiroyuki Kawata ,  Riki Okamoto ,  Naoki Yoshinaga ,  Kaoru Kawasaki ,  Natsuko Sugiura ,  Nobuhiro Fujita

发明人： Kohichi Sano ,  Chisato Wakabayashi ,  Hiroyuki Kawata ,  Riki Okamoto ,  Naoki Yoshinaga ,  Kaoru Kawasaki ,  Natsuko Sugiura ,  Nobuhiro Fujita

IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/18 ,  C21D8/02 ,  C21D8/04 ,  C23C2/04 ,  C23C2/26 ,  C23C2/28 ,  C21D9/48

CPC分类号： C22C38/02 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/48 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008 ,  C22C38/04 ,  C22C38/06 ,  C23C2/04 ,  C23C2/26 ,  C23C2/28

摘要： A high-strength cold-rolled steel sheet includes, by mass %, C: 0.10% to 0.40%, Mn: 0.5% to 4.0%, Si: 0.005% to 2.5%, Al: 0.005% to 2.5%, Cr: 0% to 1.0%, and a balance of iron and inevitable impurities, in which an amount of P is limited to 0.05% or less, an amount of S is limited to 0.02% or less, an amount of N is limited to 0.006% or less, the microstructure includes 2% to 30% of retained austenite by area percentage, martensite is limited to 20% or less by area percentage in the microstructure, an average particle size of cementite is 0.01 μm to 1 μm, and 30% to 100% of the cementite has an aspect ratio of 1 to 3.

摘要翻译： 高强度冷轧钢板以质量％计含有C：0.10％至0.40％，Mn：0.5％至4.0％，Si：0.005％至2.5％，Al：0.005％至2.5％，Cr：0 ％至1.0％，其中P含量限制在0.05％以下的铁和不可避免的杂质的余量，S的量限制在0.02％以下，N的量限定为0.006％，或者 微观结构中的残余奥氏体的面积率为2％〜30％，微观结构中的面积百分比将马氏体限制在20％以下，渗碳体的平均粒径为0.01μm〜1μm，30％〜100％ 渗碳体的％的纵横比为1〜3。

公开(公告)号：US08163108B2

公开(公告)日：2012-04-24

申请号：US12736154

申请日：2009-03-26

申请人： Masafumi Azuma ,  Naoki Yoshinaga ,  Naoki Maruyama ,  Noriyuki Suzuki ,  Yasuharu Sakuma

发明人： Masafumi Azuma ,  Naoki Yoshinaga ,  Naoki Maruyama ,  Noriyuki Suzuki ,  Yasuharu Sakuma

IPC分类号： C22C38/00 ,  C22C38/18 ,  C22C38/04 ,  C22C38/14

CPC分类号： C22C38/32 ,  C21D8/0226 ,  C21D8/04 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/002 ,  C22C38/02 ,  C22C38/28 ,  C22C38/38 ,  C23C2/02 ,  C23C2/04 ,  C23C2/26 ,  C23C2/28 ,  Y10T428/12799

摘要： This cold-rolled steel sheet includes, in terms of mass %, C: not less than 0.05% and not more than 0.095%, Cr: not less than 0.15% and not more than 2.0%, B: not less than 0.0003% and not more than 0.01%, Si: not less than 0.3% and not more than 2.0%, Mn: not less than 1.7% and not more than 2.6%, Ti: not less than 0.005% and not more than 0.14%, P: not more than 0.03%, S: not more than 0.01%, Al: not more than 0.1%, N: less than 0.005%, O: not less than 0.0005% and not more than 0.005%, and contains as the remainder, iron and unavoidable impurities, wherein the microstructure of the steel sheet includes mainly polygonal ferrite having a crystal grain size of not more than 4 μm, and hard microstructures of bainite and martensite, the block size of the martensite is not more than 0.9 μm, the Cr content within the martensite is 1.1 to 1.5 times the Cr content within the polygonal ferrite, and the tensile strength is at least 880 MPa.

摘要翻译： 该冷轧钢板以质量％计含有C：0.05％以上0.095％以下的Cr：0.15％以上2.0％以下，B：0.0003％以上， 0.01％以下，Si：0.3％以上2.0％以下，Mn：1.7％以上2.6％以下，Ti：0.005％以上0.14％以下，P： 不大于0.03％，S：不大于0.01％，Al：不大于0.1％，N：小于0.005％，O：不小于0.0005％，不大于0.005％，其余为铁 和不可避免的杂质，其中钢板的组织主要包括晶粒尺寸不大于4μm的多边形铁素体，贝氏体和马氏体的硬质组织，马氏体的块尺寸不大于0.9μm，Cr 马氏体内的含量为多边形铁素体中的Cr含量的1.1〜1.5倍，拉伸强度为880MPa以上。

公开(公告)号：US20110008647A1

公开(公告)日：2011-01-13

申请号：US12736154

申请日：2009-03-26

申请人： Masafumi Azuma ,  Naoki Yoshinaga ,  Naoki Maruyama ,  Noriyuki Suzuki ,  Yasuharu Sakuma

发明人： Masafumi Azuma ,  Naoki Yoshinaga ,  Naoki Maruyama ,  Noriyuki Suzuki ,  Yasuharu Sakuma

IPC分类号： B32B15/18 ,  C21D8/02 ,  C25D7/00 ,  C23C2/02 ,  C22C38/18 ,  C22C38/40 ,  C22C38/20 ,  C22C38/22

CPC分类号： C22C38/32 ,  C21D8/0226 ,  C21D8/04 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0473 ,  C21D9/46 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/002 ,  C22C38/02 ,  C22C38/28 ,  C22C38/38 ,  C23C2/02 ,  C23C2/04 ,  C23C2/26 ,  C23C2/28 ,  Y10T428/12799

摘要： This cold-rolled steel sheet includes, in terms of mass %, C: not less than 0.05% and not more than 0.095%, Cr: not less than 0.15% and not more than 2.0%, B: not less than 0.0003% and not more than 0.01%, Si: not less than 0.3% and not more than 2.0%, Mn: not less than 1.7% and not more than 2.6%, Ti: not less than 0.005% and not more than 0.14%, P: not more than 0.03%, S: not more than 0.01%, Al: not more than 0.1%, N: less than 0.005%, O: not less than 0.0005% and not more than 0.005%, and contains as the remainder, iron and unavoidable impurities, wherein the microstructure of the steel sheet includes mainly polygonal ferrite having a crystal grain size of not more than 4 μm, and hard microstructures of bainite and martensite, the block size of the martensite is not more than 0.9 μm, the Cr content within the martensite is 1.1 to 1.5 times the Cr content within the polygonal ferrite, and the tensile strength is at least 880 MPa.

摘要翻译： 该冷轧钢板以质量％计含有C：0.05％以上0.095％以下的Cr：0.15％以上2.0％以下，B：0.0003％以上， 0.01％以下，Si：0.3％以上2.0％以下，Mn：1.7％以上2.6％以下，Ti：0.005％以上0.14％以下，P： 不大于0.03％，S：不大于0.01％，Al：不大于0.1％，N：小于0.005％，O：不小于0.0005％，不大于0.005％，其余为铁 和不可避免的杂质，其中钢板的组织主要包括晶粒尺寸不大于4μm的多边形铁素体，贝氏体和马氏体的硬质组织，马氏体的块尺寸不大于0.9μm，Cr 马氏体内的含量为多边形铁素体中的Cr含量的1.1〜1.5倍，拉伸强度为880MPa以上。

公开(公告)号：US09410231B2

公开(公告)日：2016-08-09

申请号：US13575252

申请日：2011-01-31

申请人： Riki Okamoto ,  Natsuko Sugiura ,  Kohichi Sano ,  Chisato Wakabayashi ,  Naoki Yoshinaga ,  Kaoru Kawasaki

发明人： Riki Okamoto ,  Natsuko Sugiura ,  Kohichi Sano ,  Chisato Wakabayashi ,  Naoki Yoshinaga ,  Kaoru Kawasaki

IPC分类号： C22C38/02 ,  C23C2/28 ,  C21D9/46 ,  C22C38/04 ,  C22C38/06 ,  C23C2/02 ,  C23C2/06 ,  C22C38/00 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16

CPC分类号： C23C2/28 ,  C21D6/00 ,  C21D6/005 ,  C21D6/008 ,  C21D8/00 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C21D8/0263 ,  C21D8/04 ,  C21D8/0405 ,  C21D8/0426 ,  C21D8/0436 ,  C21D8/0447 ,  C21D9/46 ,  C21D9/48 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C23C2/02 ,  C23C2/06

摘要： A steel sheet, including: as chemical components, by mass %, 0.05% to 0.35% of C; 0.05% to 2.0% of Si; 0.8% to 3.0% of Mn; 0.01% to 2.0% of Al; equal to or less than 0.1% of P; equal to or less than 0.05% of S; equal to or less than 0.01% of N; and the balance including iron and inevitable impurities, wherein the steel sheet comprises 50% or more of a ferrite phase, a bainite phase, and a tempered martensite phase, 3% or more of a retained austenite phase, and 50% or more of the crystal grains of the retained austenite phase satisfy Expression 1, wherein a carbon concentration at a position of center of gravity is Cgc and a carbon concentration at a grain boundary is Cgb.

摘要翻译： 钢板，以质量％计，化学成分为0.05〜0.35％的C， 0.05％〜2.0％的Si; 0.8％〜3.0％的Mn; 0.01％〜2.0％的Al; 等于或小于0.1％的P; 等于或小于0.05的S; 等于或小于0.01的N; 余量包括铁和不可避免的杂质，其中钢板包含铁素体相，贝氏体相和回火马氏体相的50％以上，残余奥氏体相的3％以上，和50％以上 残留奥氏体相的晶粒满足式1，其中，重心位置的碳浓度为Cgc，晶界处的碳浓度为Cgb。