公开(公告)号：US11180835B2

公开(公告)日：2021-11-23

申请号：US15757264

申请日：2015-09-25

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kohei Ueda ,  Hiroyuki Kawata ,  Takayuki Kitazawa ,  Takeshi Yasui ,  Hiroyuki Ban

IPC分类号： C22C38/38 ,  C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/16 ,  C22C38/22 ,  C22C38/28 ,  C23F17/00 ,  C23G1/08 ,  C25D3/12 ,  C25D5/36

摘要： A steel sheet has a predetermined chemical composition, and a surface exhibits an absorption peak at which a reflectance is not less than 50% nor more than 85% in a range of wave numbers of 1200 cm−1 to 1300 cm−1 by a Fourier transform-infrared spectroscopy analysis by a reflection absorption spectrometry method, and does not exhibit an absorption peak in a range of wave numbers of 1000 cm−1 to 1100 cm−1, or exhibits an absorption peak at which a reflectance is 85% or more in the range of wave numbers of 1000 cm−1 to 1100 cm−1, wherein Ni of 3 mg/m2 to 100 mg/m2 adheres to the surface.

公开(公告)号：US09708679B2

公开(公告)日：2017-07-18

申请号：US14348502

申请日：2012-09-28

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui ,  Takuya Kuwayama ,  Hiroyuki Ban ,  Kaoru Hiramatsu

IPC分类号： C23C2/02 ,  C21D8/02 ,  C23C2/06 ,  C23C2/28 ,  C21D9/46 ,  C22C18/04 ,  C22C38/00 ,  C22C38/06 ,  C22C38/58 ,  B32B15/01 ,  C22C38/02 ,  C22C38/04

CPC分类号： C21D8/0263 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799

摘要： There is provided a high-strength hot-dip galvanized steel sheet and the like excellent in mechanical cutting property, which are capable of obtaining high ductility while ensuring high strength with maximum tensile strength of 900 MPa or more. The high-strength hot-dip galvanized steel sheet has a sheet thickness of 0.6 to 5.0 mm and has a plating layer on a surface of a steel sheet with component compositions being set in appropriate ranges, in which the steel sheet structure contains a 40 to 90% ferrite phase and a 3% or more retained austenite phase by volume fraction. In the retained austenite phase, a solid solution carbon amount is 0.70 to 1.00%, an average grain diameter is 2.0 μm or less, an average distance between grains is 0.1 to 5.0 μm, a thickness of a decarburized layer in a steel sheet surface layer portion is 0.01 to 10.0 μm, an average grain diameter of oxides contained in the steel, sheet surface layer portion is 30 to 120 nm and an average density thereof is 1.0×1012 oxides/m2 or more, and moreover, a work hardening coefficient (n value) during a 3 to 7% plastic deformation is 0.080 or more on average.

公开(公告)号：US08993120B2

公开(公告)日：2015-03-31

申请号：US14348335

申请日：2012-09-28

申请人： Nippon Steel & Sumitomo Metal Corporation

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui ,  Takuya Kuwayama ,  Hiroyuki Ban ,  Kaoru Hiramatsu

IPC分类号： B32B15/00 ,  B32B15/04 ,  B32B15/18 ,  C23C2/02 ,  C21D9/46 ,  B21B1/26 ,  B21B3/00 ,  C23C2/06 ,  C23C2/28 ,  C22C18/04 ,  C22C38/00 ,  C22C38/06 ,  C22C38/58 ,  B32B15/01 ,  C22C38/02 ,  C22C38/04 ,  C23C2/26 ,  C23C2/40

CPC分类号： C23C2/02 ,  B21B1/26 ,  B21B3/00 ,  B32B15/013 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1277 ,  C21D9/46 ,  C21D2211/005 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  Y10T428/12618 ,  Y10T428/12799 ,  Y10T428/12972 ,  Y10T428/265

摘要： A hot-dip galvanizing layer or an alloyed hot dip galvanizing layer is formed on the surface of a base steel sheet in which in volume fraction, 40 to 90% of a ferrite phase and 5% or less of a retained austenite phase are contained, and a ratio of non-recrystallized ferrite to the entire ferrite phase is 50% or less in volume fraction, and further a grain diameter ratio being a value of, of crystal grains in the ferrite phase, an average grain diameter in the rolling direction divided by an average grain diameter in the sheet width direction is 0.75 to 1.33, a length ratio being a value of, of hard structures dispersed in island shapes, an average length in the rolling direction divided by an average length in the sheet width direction is 0.75 to 1.33, and an average aspect ratio of inclusions is 5.0 or less.

摘要翻译： 在基体钢板的表面形成有热浸镀锌层或合金化热镀锌层，其中体积分数为40〜90％的铁素体相和5％以下的残留奥氏体相， 未再结晶的铁素体与铁素体相的整体的比例在体积分率中为50％以下，另外，晶粒直径比为铁素体相中的晶粒的值，轧制方向的平均粒径分割 通过片宽度方向上的平均粒径为0.75〜1.33，长度比为分散为岛状的硬结构的长度比，轧制方向的平均长度除以片宽方向的平均长度为0.75 至1.33，夹杂物的平​​均纵横比为5.0以下。

公开(公告)号：US08932729B2

公开(公告)日：2015-01-13

申请号：US14348526

申请日：2012-09-28

申请人： Nippon Steel & Sumitomo Metal Corporation

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui ,  Takuya Kuwayama ,  Hiroyuki Ban ,  Kaoru Hiramatsu

IPC分类号： B32B15/00 ,  B32B15/04 ,  B32B15/18 ,  C23C2/02 ,  B21B1/26 ,  B21B3/00 ,  C23C2/06 ,  C23C2/28 ,  C22C18/04 ,  C22C38/00 ,  C22C38/06 ,  C22C38/58 ,  B32B15/01 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C21D9/46

CPC分类号： C23C2/02 ,  B21B1/26 ,  B21B3/00 ,  B32B15/013 ,  C21D1/26 ,  C21D1/72 ,  C21D8/0257 ,  C21D8/0263 ,  C21D8/0278 ,  C21D8/0284 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2251/02 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/58 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  Y10T428/12618 ,  Y10T428/12799 ,  Y10T428/12972 ,  Y10T428/265

摘要： A base steel sheet has a hot-dip galvanized layer formed on a surface thereof, in which, in a steel sheet structure in a range of ⅛ thickness to ⅜ thickness centered around ¼ thickness of a sheet thickness from a surface, a volume fraction of a retained austenite phase is 5% or less, and a total volume fraction of phases of bainite, bainitic ferrite, fresh martensite, and tempered martensite is 40% or more, an average effective crystal grain diameter is 5.0 μm or less, a maximum effective crystal grain diameter is 20 μm or less, and a decarburized layer with a thickness of 0.01 μm to 10.0 μm is formed on a surface layer portion, in which a density of oxides dispersed in the decarburized layer is 1.0×1012 to 1.0×1016 oxides/m2, and an average grain diameter of the oxides is 500 nm or less.

摘要翻译： 基材钢板的表面形成有热浸镀锌层，其中，以从板表面厚度的1/4厚度到厚度的厚度至⅜厚度的钢板结构体的体积分数 残留奥氏体相为5％以下，贝氏体，贝氏体铁素体，新鲜马氏体和回火马氏体相的总体积分数为40％以上，平均有效晶粒直径为5.0μm以下，最大有效 晶粒直径为20μm以下，分散在脱碳层中的氧化物的密度为1.0×10 12〜1.0×10 16个氧化物的表层部形成厚度为0.01μm〜10.0μm的脱碳层 / m 2，氧化物的平均粒径为500nm以下。

公开(公告)号：US20140234660A1

公开(公告)日：2014-08-21

申请号：US14348536

申请日：2012-09-28

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui ,  Takuya Kuwayama ,  Hiroyuki Ban ,  Kaoru Hiramatsu

IPC分类号： B32B15/01 ,  C23C2/02

CPC分类号： B32B15/013 ,  B21B1/22 ,  B21B1/26 ,  B21B3/00 ,  B21B2001/225 ,  B21B2001/228 ,  C21D9/00 ,  C21D9/46 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  C23C30/005 ,  Y10T428/12618 ,  Y10T428/12799 ,  Y10T428/12965 ,  Y10T428/12972 ,  Y10T428/2495 ,  Y10T428/24967 ,  Y10T428/264 ,  Y10T428/265

摘要： Steel contains each of C, Si, Mn, P, S, Al, N, O, at a range from ⅛ thickness centered around a ¼ sheet thickness from a surface to ⅜ thickness centered around the ¼ sheet thickness from the surface at a base steel sheet, a structure of the base steel sheet contains, in volume fraction, 3% or more of a retained austenite phase, 50% or less of a ferrite phase, and 40% or more of a hard phase, average dislocation density is 5×1013/m2 or more, solid-solution C amount contained in the retained austenite phase is in mass % 0.70 to 1.00%, X-ray random intensity ratio of FCC iron in an texture of the retained austenite phase is 3.0 or less, ratio between a grain diameter relative to a rolling direction and a grain diameter relative to a sheet width direction of the retained austenite phase is 0.75 to 1.33.

摘要翻译： 钢包含C，Si，Mn，P，S，Al，N，O中的每一个，以⅛厚度为中心的⅛厚度范围，从¼厚度从表面到⅜厚度以¼厚度为中心从基底的表面 钢板，基体钢板的结构体积分数为3％以上的残余奥氏体相，50％以下的铁素体相和40％以上的硬质相，平均位错密度为5 ×10 13 / m 2以上时，残存奥氏体相中所含的固溶C含量在质量％为0.70〜1.00％之间，FCC铁在残余奥氏体相的组织中的X射线随机强度比为3.0以下 在相对于轧制方向的粒径和相对于残留奥氏体相的片材宽度方向的粒径之间为0.75〜1.33。

公开(公告)号：US20140287263A1

公开(公告)日：2014-09-25

申请号：US14348502

申请日：2012-09-28

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui ,  Takuya Kuwayama ,  Hiroyuki Ban ,  Kaoru Hiramatsu

IPC分类号： C23C2/02 ,  C21D8/02

CPC分类号： C21D8/0263 ,  B32B15/013 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0278 ,  C21D9/46 ,  C21D2211/001 ,  C21D2211/005 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  Y10T428/12799

摘要： There is provided a high-strength hot-dip galvanized steel sheet and the like excellent in mechanical cutting property, which are capable of obtaining high ductility while ensuring high strength with maximum tensile strength of 900 MPa or more. The high-strength hot-dip galvanized steel sheet has a sheet thickness of 0.6 to 5.0 mm and has a plating layer on a surface of a steel sheet with component compositions being set in appropriate ranges, in which the steel sheet structure contains a 40 to 90% ferrite phase and a 3% or more retained austenite phase by volume fraction. In the retained austenite phase, a solid solution carbon amount is 0.70 to 1.00%, an average grain diameter is 2.0 μm or less, an average distance between grains is 0.1 to 5.0 μm, a thickness of a decarburized layer in a steel sheet surface layer portion is 0.01 to 10.0 μm, an average grain diameter of oxides contained in the steel, sheet surface layer portion is 30 to 120 nm and an average density thereof is 1.0×1012 oxides/m2 or more, and moreover, a work hardening coefficient (n value) during a 3 to 7% plastic deformation is 0.080 or more on average.

摘要翻译： 提供了一种机械切割性优异的高强度热浸镀锌钢板等，其能够获得高延展性，同时确保最大拉伸强度为900MPa以上的高强度。 高强度热浸镀锌钢板的板厚为0.6〜5.0mm，在钢板表面具有镀层，成分组成为适当范围，钢板结构体含有40〜 90％的铁素体相和3％以上的残余奥氏体相的体积分数。 在残留奥氏体相中，固溶碳量为0.70〜1.00％，平均粒径为2.0μm以下，晶粒间的平均距离为0.1〜5.0μm，钢板表面层的脱碳层的厚度 部分为0.01〜10.0μm，钢，片状表面层部的氧化物的平均粒径为30〜120nm，平均密度为1.0×10 12个/ m 2以上，加工硬化系数 n值）在3〜7％塑性变形时平均为0.080以上。

公开(公告)号：US20140234659A1

公开(公告)日：2014-08-21

申请号：US14348335

申请日：2012-09-28

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui ,  Takuya Kuwayama ,  Hiroyuki Ban ,  Kaoru Hiramatsu

IPC分类号： C23C2/02 ,  B32B15/01

CPC分类号： C23C2/02 ,  B21B1/26 ,  B21B3/00 ,  B32B15/013 ,  C21D8/1222 ,  C21D8/1233 ,  C21D8/1255 ,  C21D8/1277 ,  C21D9/46 ,  C21D2211/005 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  Y10T428/12618 ,  Y10T428/12799 ,  Y10T428/12972 ,  Y10T428/265

摘要： A hot-dip galvanizing layer or an alloyed hot dip galvanizing layer is formed on the surface of a base steel sheet in which in volume fraction, 40 to 90% of a ferrite phase and 5% or less of a retained austenite phase are contained, and a ratio of non-recrystallized ferrite to the entire ferrite phase is 50% or less in volume fraction, and further a grain diameter ratio being a value of, of crystal grains in the ferrite phase, an average grain diameter in the rolling direction divided by an average grain diameter in the sheet width direction is 0.75 to 1.33, a length ratio being a value of, of hard structures dispersed in island shapes, an average length in the rolling direction divided by an average length in the sheet width direction is 0.75 to 1.33, and an average aspect ratio of inclusions is 5.0 or less.

摘要翻译： 在基体钢板的表面形成有热浸镀锌层或合金化热镀锌层，其中体积分数为40〜90％的铁素体相和5％以下的残留奥氏体相， 未再结晶的铁素体与铁素体相的整体的比例在体积分率中为50％以下，另外，晶粒直径比为铁素体相中的晶粒的值，轧制方向的平均粒径分割 通过片宽度方向上的平均粒径为0.75〜1.33，以岛状分散的硬结构的长度比为长度，轧制方向的平均长度除以片宽方向的平均长度为0.75 至1.33，夹杂物的平​​均纵横比为5.0以下。

公开(公告)号：US20140227555A1

公开(公告)日：2014-08-14

申请号：US14348526

申请日：2012-09-28

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui ,  Takuya Kuwayama ,  Hiroyuki Ban ,  Kaoru Hiramatsu

IPC分类号： C23C2/02

CPC分类号： C23C2/02 ,  B21B1/26 ,  B21B3/00 ,  B32B15/013 ,  C21D1/26 ,  C21D1/72 ,  C21D8/0257 ,  C21D8/0263 ,  C21D8/0278 ,  C21D8/0284 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2251/02 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/58 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  Y10T428/12618 ,  Y10T428/12799 ,  Y10T428/12972 ,  Y10T428/265

摘要： A base steel sheet has a hot-dip galvanized layer formed on a surface thereof, in which, in a steel sheet structure in a range of ⅛ thickness to ⅜ thickness centered around ¼ thickness of a sheet thickness from a surface, a volume fraction of a retained austenite phase is 5% or less, and a total volume fraction of phases of bainite, bainitic ferrite, fresh martensite, and tempered martensite is 40% or more, an average effective crystal grain diameter is 5.0 μm or less, a maximum effective crystal grain diameter is 20 μm or less, and a decarburized layer with a thickness of 0.01 μm to 10.0 μm is formed on a surface layer portion, in which a density of oxides dispersed in the decarburized layer is 1.0×1012 to 1.0×1016 oxides/m2, and an average grain diameter of the oxides is 500 nm or less.

摘要翻译： 基材钢板的表面形成有热浸镀锌层，其中，以从板表面厚度的1/4厚度到厚度的厚度至⅜厚度的钢板结构体的体积分数 残留奥氏体相为5％以下，贝氏体，贝氏体铁素体，新鲜马氏体和回火马氏体相的总体积分数为40％以上，平均有效晶粒直径为5.0μm以下，最大有效 晶粒直径为20μm以下，分散在脱碳层中的氧化物的密度为1.0×10 12〜1.0×10 16个氧化物的表层部形成厚度为0.01μm〜10.0μm的脱碳层 / m 2，氧化物的平均粒径为500nm以下。

公开(公告)号：US09702035B2

公开(公告)日：2017-07-11

申请号：US14559252

申请日：2014-12-03

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui ,  Takuya Kuwayama ,  Hiroyuki Ban ,  Kaoru Hiramatsu

IPC分类号： C22C38/04 ,  C23C2/02 ,  B21B1/26 ,  B21B3/00 ,  C23C2/06 ,  C23C2/28 ,  C21D9/46 ,  C22C18/04 ,  C22C38/00 ,  C22C38/06 ,  C22C38/58 ,  B32B15/01 ,  C21D8/02 ,  C22C38/02 ,  C21D1/26 ,  C21D1/72 ,  C23C2/12 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18

CPC分类号： C23C2/02 ,  B21B1/26 ,  B21B3/00 ,  B32B15/013 ,  C21D1/26 ,  C21D1/72 ,  C21D8/0257 ,  C21D8/0263 ,  C21D8/0278 ,  C21D8/0284 ,  C21D9/46 ,  C21D2211/002 ,  C21D2211/008 ,  C21D2251/02 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C22C38/58 ,  C23C2/06 ,  C23C2/12 ,  C23C2/28 ,  Y10T428/12618 ,  Y10T428/12799 ,  Y10T428/12972 ,  Y10T428/265

摘要： A base steel sheet has a hot-dip galvanized layer formed on a surface thereof, in which, in a steel sheet structure in a range of ⅛ thickness to ⅜ thickness centered around ¼ thickness of a sheet thickness from a surface, a volume fraction of a retained austenite phase is 5% or less, and a total volume fraction of phases of bainite, bainitic ferrite, fresh martensite, and tempered martensite is 40% or more, an average effective crystal grain diameter is 5.0 μm or less, a maximum effective crystal grain diameter is 20 μm or less, and a decarburized layer with a thickness of 0.01 μm to 10.0 μm is formed on a surface layer portion, in which a density of oxides dispersed in the decarburized layer is 1.0×1012 to 1.0×1016 oxides/m2, and an average grain diameter of the oxides is 500 nm or less.

公开(公告)号：US09162422B2

公开(公告)日：2015-10-20

申请号：US14348536

申请日：2012-09-28

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Hiroyuki Kawata ,  Naoki Maruyama ,  Akinobu Murasato ,  Akinobu Minami ,  Takeshi Yasui ,  Takuya Kuwayama ,  Hiroyuki Ban ,  Kaoru Hiramatsu

IPC分类号： B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C23C2/02 ,  C23C2/06 ,  C21D9/00 ,  C21D9/46 ,  B21B3/00 ,  B21B1/26 ,  B21B1/22 ,  C23C30/00 ,  C23C2/28 ,  C22C18/04 ,  C22C38/00 ,  C22C38/06 ,  C22C38/58 ,  C22C38/02 ,  C22C38/04 ,  C23C2/26 ,  C23C2/40

CPC分类号： B32B15/013 ,  B21B1/22 ,  B21B1/26 ,  B21B3/00 ,  B21B2001/225 ,  B21B2001/228 ,  C21D9/00 ,  C21D9/46 ,  C22C18/04 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/58 ,  C23C2/02 ,  C23C2/06 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40 ,  C23C30/005 ,  Y10T428/12618 ,  Y10T428/12799 ,  Y10T428/12965 ,  Y10T428/12972 ,  Y10T428/2495 ,  Y10T428/24967 ,  Y10T428/264 ,  Y10T428/265

摘要： Steel contains each of C, Si, Mn, P, S, Al, N, O, at a range from ⅛ thickness centered around a ¼ sheet thickness from a surface to ⅜ thickness centered around the ¼ sheet thickness from the surface at a base steel sheet, a structure of the base steel sheet contains, in volume fraction, 3% or more of a retained austenite phase, 50% or less of a ferrite phase, and 40% or more of a hard phase, average dislocation density is 5×1013/m2 or more, solid-solution C amount contained in the retained austenite phase is in mass % 0.70 to 1.00%, X-ray random intensity ratio of FCC iron in an texture of the retained austenite phase is 3.0 or less, ratio between a grain diameter relative to a rolling direction and a grain diameter relative to a sheet width direction of the retained austenite phase is 0.75 to 1.33.

摘要翻译： 钢包含C，Si，Mn，P，S，Al，N，O中的每一个，以⅛厚度为中心的⅛厚度范围，从¼厚度从表面到⅜厚度，以¼厚度为中心从基底的表面 钢板，基体钢板的结构体积分数为3％以上的残余奥氏体相，50％以下的铁素体相和40％以上的硬质相，平均位错密度为5 ×10 13 / m 2以上时，残存奥氏体相中所含的固溶C含量在质量％为0.70〜1.00％之间，FCC铁在残余奥氏体相中的X射线随机强度比为3.0以下， 在相对于轧制方向的粒径和相对于残留奥氏体相的片材宽度方向的粒径之间为0.75〜1.33。