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公开(公告)号：US20190085426A1
公开(公告)日：2019-03-21
申请号：US16080571
申请日：2017-02-08
发明人： Muneaki IKEDA , Koji KASUYA , Tadao MURATA , Kenji SAITO , Toshio MURAKAMI , Yuichi FUTAMURA
摘要： One aspect of the present invention is a high strength steel sheet having a specific component composition, wherein a metal structure of the steel sheet comprises polygonal ferrite, bainite, tempered martensite, and retained austenite; when the metal structure is observed with a scanning electron microscope, the metal structure satisfies polygonal ferrite: 10 to 50 area %, bainite: 10 to 50 area %, and tempered martensite: 10 to 80 area % with respect to the metal structure overall; and when the metal structure is measured by X-ray diffractometry, the metal structure satisfies retained austenite: 5.0 volume % or more, retained austenite with a carbon concentration of 1.0 mass % or less: 3.5 volume % or more, and retained austenite with a carbon concentration of 0.8 mass % or less: 2.4 volume % or less with respect to the metal structure overall.
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公开(公告)号：US20180002799A1
公开(公告)日：2018-01-04
申请号：US15541951
申请日：2016-01-05
发明人： Yuichi FUTAMURA , Muneaki IKEDA , Michiharu NAKAYA
IPC分类号： C23C2/28 , C22C38/60 , C22C38/06 , C22C38/02 , B32B15/01 , C22C38/00 , C21D9/46 , C21D8/02 , C23C2/06 , C22C38/04
CPC分类号： C23C2/28 , B32B15/013 , C21D1/74 , C21D8/0226 , C21D8/0236 , C21D8/0247 , C21D8/0263 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/38 , C22C38/60 , C23C2/06 , C23C2/40
摘要： A high-strength plated steel sheet sequentially includes an internal oxidized layer, a soft layer containing the internal oxidized layer, and a hard layer including a structure having metallic structure which contains a low-temperature-transformation produced phase in a proportion of 20 to 85% by area of the whole of the metallic structure, polygonal ferrite in a proportion more than 10% by area, and 70% or less by area of the whole of the metallic structure, and-retained austenite in a proportion of 5% or more by volume of the whole of the metallic structure. The high-strength plated steel sheet satisfies the average depth D of the soft layer being 20 μm or more, the average depth d of the internal oxidized layer being 4 μm or more and less than D, and a tensile strength being 980 MPa or more.
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公开(公告)号：US20170369965A1
公开(公告)日：2017-12-28
申请号：US15541918
申请日：2016-01-05
发明人： Muneaki IKEDA , Yuichi FUTAMURA , Michiharu NAKAYA
IPC分类号： C21D9/46 , C21D8/02 , C23C2/06 , C23C2/02 , C22C38/32 , C22C38/28 , C22C38/22 , C22C38/18 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C23C2/40 , C23F17/00
CPC分类号： C21D9/46 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0278 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/22 , C22C38/28 , C22C38/32 , C23C2/02 , C23C2/06 , C23C2/40 , C23F17/00 , C23G1/06 , C23G1/08
摘要： A high-strength plated steel sheet has a plated layer on the surface of a base steel sheet and contains predetermined steel components. The steel sheet includes, in the order from the interface of the base steel sheet and the plated layer towards the base steel sheet: a soft layer having a Vickers hardness that is 90% or less of the Vickers hardness at a portion t/4 of the base steel sheet, where t is a sheet thickness of the base steel sheet; and a hard layer containing martensite and bainite, and ferrite in predetermined ranges. The average depth D of the soft layer is 20 μm or greater, and the average depth d of an internal oxide layer is 4 μm or greater and smaller than D.
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4.发明申请HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT DUCTILITY AND LOW-TEMPERATURE TOUGHNESS, AND METHOD FOR PRODUCING SAME 审中-公开具有优异的密度和低温韧性的高强度钢板及其制造方法公开(公告)号：US20160208359A1
公开(公告)日：2016-07-21
申请号：US15023520
申请日：2014-09-25
发明人： Koji KASUYA , Tadao MURATA , Sae MIZUTA , Yuichi FUTAMURA
IPC分类号： C21D9/46 , C22C38/16 , C22C38/14 , C22C38/00 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/38 , C22C38/12
CPC分类号： C21D9/46 , C21D8/0205 , C21D8/0247 , C21D2211/001 , C21D2211/002 , 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 , C22C38/18 , C22C38/38 , C23C2/02 , C23C2/06 , C23C2/28
摘要： A high-strength steel sheet of the present invention is a steel sheet satisfying a predetermined component composition. A metal structure of the steel sheet is composed of polygonal ferrite, high-temperature region generated bainite, low-temperature region generated bainite and retained austenite each having a predetermined area percent, and a distribution using each average IQ of predetermined crystal grains determined by electron backscatter diffraction satisfies Equations (1) and (2) below. According to the present invention, a high-strength steel sheet having excellent ductility and low-temperature toughness can be realized even at a tensile strength of 780 MPa or more. (IQave−IQmin)/(IQmax−IQmin)≧0.40 (1) (σIQ)/(IQmax−IQmin)≦0.25 (2)
摘要翻译： 本发明的高强度钢板是满足规定成分组成的钢板。 钢板的金属结构由多边形铁素体，高温区域生成的贝氏体，低温区域生成贝氏体和各自具有预定面积百分比的残留奥氏体组成，并且使用由电子测定的预定晶粒的平均IQ的分布 反向散射衍射满足下面的等式（1）和（2）。 根据本发明，即使在780MPa以上的拉伸强度下也能够实现延展性和低温韧性优异的高强度钢板。 （IQave-IQmin）/（IQmax-IQmin）≥0.40（1）（＆sgr; IQ）/（IQmax-IQmin）＆nlE; 0.25（2）
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公开(公告)号：US20190218640A1
公开(公告)日：2019-07-18
申请号：US16321544
申请日：2017-07-21
CPC分类号： C21D9/46 , C21D1/18 , C21D1/34 , C21D6/005 , C21D6/008 , C21D2211/001 , C21D2211/002 , C21D2211/008 , C22C38/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06
摘要： Disclosed is a high-strength sheet including: C: 0.15% to 0.35% by mass, total of Si and Al: 0.5% to 3.0% by mass, Mn: 1.0% to 4.0% by mass, P: 0.05% by mass or less, and S: 0.01% by mass or less, with the balance being Fe and inevitable impurities, wherein the steel structure satisfies that: a ferrite fraction is 5% or less, the total fraction of tempered martensite and tempered bainite is 60% or more, the amount of retained austenite is 10% or more, MA has an average size of 1.0 μm or less, retained austenite has an average size of 1.0 μm or less, retained austenite having a size of 1.5 μm or more accounts for 2% or more of the total amount of retained austenite, and a scattering intensity at the q value of 1 nm−1 in X-ray small angle scattering is 1.0 cm1 or less.
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公开(公告)号：US20170096723A1
公开(公告)日：2017-04-06
申请号：US15126936
申请日：2014-12-25
发明人： Koji KASUYA , Sae MIZUTA , Yuichi FUTAMURA
IPC分类号： C21D9/46 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C23C2/06 , C22C38/14 , C22C38/28 , C22C38/22 , C22C38/08 , C23C2/28 , C21D8/02 , C22C38/12
CPC分类号： C21D9/46 , C21D8/0226 , C21D8/0236 , C21D8/0247 , C21D8/0278 , 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 , C22C38/60 , C23C2/06 , C23C2/28
摘要： Provided is a high strength cold rolled steel sheet having a tensile strength of 980 MPa or higher and excellent ductility and bendability. The high strength cold rolled steel sheet has a specified component composition. The structures at a position of ¼ sheet thickness in the steel sheet has certain area ratio of ferrite relative to the entire structure, certain area ratio of a mixed structure of fresh martensite and retained austenite relative to the entire structure, certain region in which the concentration of Mn is enriched, certain standard deviation of the fraction of a region in which the concentration of Mn is enriched, and certain concentration of Mn in a ferrite phase.
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7.发明申请HIGH-STRENGTH STEEL SHEET EXCELLENT IN WORKABILITY AND MANUFACTURING METHOD THEREOF 审中-公开高强度钢板具有优异的可加工性及其制造方法公开(公告)号：US20160355920A1
公开(公告)日：2016-12-08
申请号：US15239858
申请日：2016-08-18
IPC分类号： C23C2/40 , C21D6/00 , C22C38/58 , C22C38/50 , C22C38/42 , C22C38/38 , C22C38/34 , C22C38/22 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C23C2/06 , C21D9/46
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1μm以上的碳化物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，确定残留奥氏体的相邻区域和/或小于1μm的相邻区域之间的平均距离; 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。
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8.发明申请HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT FORMABILITY AND LOW-TEMPERATURE TOUGHNESS, AND METHOD FOR PRODUCING SAME 审中-公开具有优异的可塑性和低温韧性的高强度钢板及其制造方法公开(公告)号：US20160237520A1
公开(公告)日：2016-08-18
申请号：US15024423
申请日：2014-09-25
发明人： Tadao MURATA , Koji KASUYA , Sae MIZUTA , Yuichi FUTAMURA
IPC分类号： C21D9/46 , C23C2/28 , C23C2/36 , C25D3/22 , C25D7/00 , C22C38/38 , C22C38/34 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D6/00 , C21D1/19 , B32B15/01 , C23C2/06
CPC分类号： C21D9/46 , B32B15/013 , C21D1/19 , C21D1/20 , C21D1/22 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0236 , C21D8/0247 , C21D8/0284 , C21D9/573 , C21D2201/05 , C21D2211/001 , C21D2211/002 , 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 , C22C38/60 , C23C2/06 , C23C2/285 , C23C2/36 , C25D3/22 , C25D7/00
摘要： A high-strength steel sheet of the present invention is a steel sheet satisfying a predetermined component composition. A metal structure of the steel sheet is composed of polygonal ferrite, high-temperature region generated bainite, low-temperature region generated bainite and retained austenite each having a predetermined area percent, and a distribution using each average IQ of predetermined crystal grains determined by electron backscatter diffraction satisfies Equations (1) and (2) below. According to the present invention, a high-strength steel sheet having excellent formability and low-temperature toughness can be realized even at a tensile strength of 590 MPa or more. (IQave−IQmin)/(IQmax−IQmin)≧0.40 (1) (σIQ)/(IQmax−IQmin)≦0.25 (2)
摘要翻译： 本发明的高强度钢板是满足规定成分组成的钢板。 钢板的金属结构由多边形铁素体，高温区域生成的贝氏体，低温区域生成贝氏体和各自具有预定面积百分比的残留奥氏体组成，并且使用由电子测定的预定晶粒的平均IQ的分布 反向散射衍射满足下面的等式（1）和（2）。 根据本发明，即使在590MPa以上的拉伸强度下也能够得到成形性和低温韧性优异的高强度钢板。 （IQave-IQmin）/（IQmax-IQmin）≥0.40（1）（σIQ）/（IQmax-IQmin）≤0.25（2）
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公开(公告)号：US20190185958A1
公开(公告)日：2019-06-20
申请号：US16321157
申请日：2017-07-21
CPC分类号： C21D9/46 , C21D1/18 , C21D6/005 , C21D6/008 , C22C38/00 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06
摘要： Disclosed is a high-strength sheet including: C: 0.15% by mass to 0.35% by mass, total of Si and Al: 0.5% by mass to 3.0% by mass, Mn: 1.0% by mass to 4.0% by mass, P: 0.05% by mass or less, and S: 0.01% by mass or less, with the balance being Fe and inevitable impurities, wherein the steel structure satisfies that: a ferrite fraction is 5% or less, the total fraction of tempered martensite and tempered bainite is 60% or more, the amount of retained austenite is 10% or more, MA has an average size of 1.0 μm or less, a half-width of the concentration distribution of Mn in the carbon-concentrated region that is equal to the amount of retained austenite is 0.3% by mass or more, and a scattering intensity at the q value of 1 nm−1 in X-ray small angle scattering is 1.0 cm−1 or less.
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公开(公告)号：US20190071757A1
公开(公告)日：2019-03-07
申请号：US16082519
申请日：2017-02-22
IPC分类号： C22C38/04 , C21D6/00 , C21D9/46 , C21D11/00 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/32 , C22C38/42 , C22C38/44 , C22C38/48 , C22C38/54
摘要： A high-strength steel sheet comprising, as component composition, by mass: C: 0.15 to 0.35%; total of Si and Al: 0.5 to 2.5%; Mn: 1.0 to 4.0%; P: more than 0% and 0.05% or less; and S: more than 0% and 0.01% or less, with the balance being Fe and inevitable impurities, wherein a steel structure satisfies, in ratio with respect to the whole structure: ferrite: more than 5 area % and 50 area % or less; total of tempered martensite and bainite: 30 area % or more; and retained austenite: 10 volume % or more, the steel structure further includes MA, and the steel structure satisfies: an average circle equivalent diameter of the MA: 1.0 μm or less; an average circle equivalent diameter of the retained austenite: 1.0 μm or less; and a volume ratio of retained austenite with a circle equivalent diameter of 1.5 μm or more to the whole retained austenite: 5% or more.
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