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11.发明申请公开(公告)号：US20170204490A1
公开(公告)日：2017-07-20
申请号：US15326540
申请日：2015-08-05
发明人： Yoshiyasu KAWASAKI , Hiroshi MATSUDA , Yoshie OBATA , Shinjiro KANEKO , Takeshi YOKOTA , Kazuhiro SETO
IPC分类号： C21D9/46 , C21D6/00 , C22C38/60 , C22C38/38 , C23F17/00 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/00 , C23C2/06 , C21D8/02 , C22C38/16
CPC分类号： C21D9/46 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0273 , C21D8/0278 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C22C18/04 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/38 , C22C38/60 , C23C2/02 , C23C2/06 , C23F17/00
摘要： Disclosed is a high-strength steel sheet having a predetermined chemical composition and a steel microstructure that contains, by area, 25-80% of ferrite and bainitic ferrite in total, and 3-20% of martensite, and that contains, by volume, 10% or more of retained austenite, in which the retained austenite has a mean grain size of 2 μm or less, a mean Mn content in the retained austenite in mass % is at least 1.2 times the Mn content in the steel sheet in mass %, an area ratio of retained austenite having a mean C content in mass % at least 2.1 times the C content in the steel sheet in mass % is 60% or more of an area ratio of the entire retained austenite.
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公开(公告)号：US20220275471A1
公开(公告)日：2022-09-01
申请号：US17632566
申请日：2020-07-16
摘要： The high-strength thin steel sheet has a chemical composition containing C, Si, Mn, P, S, Al, and N, with the balance being Fe and inevitable impurities, and a complex structure containing ferrite, tempered martensite, and bainite, where a volume fraction of a total of tempered martensite and bainite containing five or more carbides with a particle size of 0.1 μm or more and 1.0 μm or less in a grain with respect to a total of the tempered martensite and the bainite is 85% or more, and C mass % and Mn mass % in a region of 20 μm or less in a thickness direction from a surface of the steel sheet are each 20% or less with respect to C mass % and Mn mass % in a region of 100 μm or more and 200 μm or less from the surface of the steel sheet.
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公开(公告)号：US20220154301A1
公开(公告)日：2022-05-19
申请号：US17434255
申请日：2020-02-28
发明人： Yoichiro MATSUI , Yuka MIYAMOTO , Takeshi YOKOTA
IPC分类号： C21D9/46 , C22C38/54 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00
摘要： A steel sheet and a member excellent in cold workability, hardenability, and post-quenching surface layer hardness, and methods for manufacturing the steel sheet and the member. The steel sheet has a specified chemical composition and a microstructure containing ferrite and carbides, a ratio of the volume of ferrite and carbides to the volume of the entire microstructure is 90% or more, a ratio of the volume of proeutectoid ferrite to the volume of the entire microstructure is 20% or more and 80% or less, a Mn concentration in the carbides is 0.10 mass % or more and 0.50 mass % or less, and a ratio of the number of carbides with particle diameters of 1 μm or more to the total number of carbides is 30% or more and 60% or less.
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14.发明申请公开(公告)号：US20170204492A1
公开(公告)日：2017-07-20
申请号：US15329026
申请日：2015-07-31
发明人： Keiji UEDA , Shinjiro KANEKO , Masami IWASAKI , Reiko SUGIHARA , Takeshi YOKOTA , Kazuhiro SETO
IPC分类号： C21D9/46 , C21D1/26 , C22C38/58 , C22C38/50 , C22C38/48 , C22C38/42 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/20 , C22C38/24 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/02
CPC分类号： C21D9/46 , C21D1/26 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/42 , C22C38/48 , C22C38/50 , C22C38/58
摘要： A cold-rolled steel sheet having excellent spot weldability suitable for use in vehicles, electric appliances, etc. is provided. The cold-rolled steel sheet has a steel composition containing, in mass%: C: 0.05% to 0.13%; Si: 0.05% to 2.0%; Mn: 1.5% to 4.0%; P: 0.05% or less; S: 0.005% or less; Al: 0.01% to 0.10%; Cr: 0.05% to 1.0%; Nb: 0.010% to 0.070%; Ti: 0.005% to 0.040%; and N: 0.0005% to 0.0065%, with a mass ratio Ti/N of Ti and N being 2.5 or more and 7.5 or less, and a balance being Fe and incidental impurities, wherein 70 mass % or more of Ti in steel exists as a precipitate, and 15 mass % or more of Nb in the steel exists as solute Nb, and a tensile strength is 980 MPa or more.
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15.发明申请公开(公告)号：US20170175219A1
公开(公告)日：2017-06-22
申请号：US15327126
申请日：2015-08-05
发明人： Yoshiyasu KAWASAKI , Hiroshi MATSUDA , Yoshie OBATA , Shinjiro KANEKO , Takeshi YOKOTA , Kazuhiro SETO
IPC分类号： C21D9/46 , C22C38/38 , C22C38/60 , C22C38/32 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/14 , C22C38/12 , C21D8/02 , C22C38/28
摘要： Disclosed is a high-strength steel sheet having a predetermined chemical composition, satisfying the condition that Mn content divided by B content equals 2100 or less, and a steel microstructure that contains, by area, 25-80% of ferrite and bainitic ferrite in total, 3-20% of martensite, and that contains, by volume, 10% or more of retained austenite, in which the retained austenite has a mean grain size of 2 μm or less, a mean Mn content in the retained austenite in mass % is at least 1.2 times the Mn content in the steel sheet in mass %, and an aggregate of retained austenite formed by seven or more identically-oriented retained austenite grains accounts for 60% or more by area of the entire retained austenite.
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16.发明申请HIGH STRENGTH STEEL SHEET HAVING HIGH YOUNG'S MODULUS AND METHOD FOR MANUFACTURING THE SAME 审中-公开具有高年龄模块的高强度钢板及其制造方法公开(公告)号：US20160186283A1
公开(公告)日：2016-06-30
申请号：US14909253
申请日：2014-07-16
发明人： Hidekazu MINAMI , Takeshi YOKOTA , Kazuhiro SETO
IPC分类号： C21D9/46 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/04 , C22C38/02 , C22C38/00 , C23C2/02 , C23C2/06 , C23C2/28 , C23C2/40 , C21D8/02 , C21D6/00 , C22C38/60
摘要： A high strength steel sheet having a high Young's modulus, the steel sheet having a chemical composition including, by mass %, C: 0.060% or more and 0.150% or less, Si: 0.50% or more and 2.20% or less, Mn: 1.00% or more and 3.00% or less, and one or both of Ti: 0.001% or more and 0.200% or less and Nb: 0.001% or more and 0.200% or less, in which the contents of C, N, S, Ti, and Nb satisfy the equation 500≦C*≦1300. The steel sheet has a microstructure including ferrite in an amount of 20% or more and martensite in an amount of 5% or more, in terms of area ratio, such that the average grain size of the ferrite is 20.0 μm or less and the inverse intensity ratio of γ-fiber for α-fiber is 1.00 or more in the ferrite and the martensite.
摘要翻译： 具有高杨氏模量的高强度钢板，所述钢板的化学成分以质量％计含有C：0.060％以上且0.150％以下，Si：0.50％以上且2.20％以下，Mn： 1.00％以上且3.00％以下，Ti：0.001％以上且0.200％以下，Nb：0.001％以上且0.200％以下的一种以上，C，N，S， Ti和Nb满足方程500＆amp; NlE; C *＆nlE; 1300。 该钢板的面积比为20％以上的铁素体和5％以上的马氏体的组织，铁素体的平均粒径为20.0μm以下， 铁素体和马氏体中α-纤维的γ纤维的强度比为1.00以上。
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公开(公告)号：US20220251676A1
公开(公告)日：2022-08-11
申请号：US17630504
申请日：2020-06-19
IPC分类号： C21D9/46 , B32B15/01 , C22C38/58 , C22C38/44 , C22C38/32 , C22C38/30 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/20 , C22C38/00 , C21D8/02 , C21D6/00
摘要： Provided are a high-strength hot-dip galvanized steel sheet that has a tensile strength of 1180 MPa or more and excellent ductility, stretch flangeability, bendability and LME resistance and can manufacture parts with high dimensional accuracy, and its manufacturing method. The high-strength steel sheet with a tensile strength of 1180 MPa or more has a chemical composition containing C, Si, Mn, P, S, Al and N, with [% Si], [% Mn], [% P], [% Mo] and [% Cr] satisfying a predetermined relationship and the balance being Fe and inevitable impurities, and a steel microstructure including ferrite, tempered martensite and bainite, and retained austenite, where the diffusible hydrogen amount in the steel sheet is 0.60 mass ppm or less, a thickness of softened surface layer is 5 μm or more and 150 μm or less, and a frequency of coincidence boundary in the steel sheet surface layer after a high-temperature tensile test is 0.45 or less.
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公开(公告)号：US20190093191A1
公开(公告)日：2019-03-28
申请号：US15768894
申请日：2016-10-03
IPC分类号： C21D8/02 , C22C38/04 , C22C38/06 , C22C38/02 , C22C38/00 , C21D1/18 , C23C2/02 , C23C2/06 , C23C2/12 , C23C2/28 , C23C2/40
摘要： A hot pressed member having all of: high strength of 1500 MPa or more in tensile strength TS; high ductility of 6.0% or more in uniform elongation uEl; and excellent heat treatment hardenability of increasing in yield stress YS by 150 MPa or more when subjected to heat treatment (baking finish) is provided. A hot pressed member comprises: a predetermined chemical composition (in particular, low C of 0.090% or more and less than 0.30% and high Mn of 3.5% or more and less than 11.0%); a microstructure including a martensite phase of 70.0% or more in volume fraction and a retained austenite phase of 3.0% or more and 30.0% or less in volume fraction; and a dislocation density of 1.0×1016/m2 or more.
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公开(公告)号：US20180305785A1
公开(公告)日：2018-10-25
申请号：US15768905
申请日：2016-10-03
CPC分类号： C21D9/46 , B21D22/02 , B21D22/022 , B21D22/20 , B21D24/00 , B21D53/88 , C21D1/18 , C21D9/00 , C21D2211/001 , C21D2211/005 , C21D2211/008 , C22C38/00 , C22C38/004 , C22C38/58 , C22C38/60
摘要： A hot pressed member comprises: a predetermined chemical composition (in particular, low C of 0.090% or more and less than 0.30% and high Mn of 3.5% or more and less than 11.0%); a first region having: a microstructure including a martensite phase of 80.0% or more in volume fraction and a retained austenite phase of 3.0% or more and 20.0% or less in volume fraction; and a dislocation density of 1.0×1016/m2 or more; and a second region having a microstructure including a ferrite phase of 30.0% or more and 60.0% or less in volume fraction, a retained austenite phase of 10.0% or more and 70.0% or less in volume fraction, and a martensite phase of 30.0% or less in volume fraction.
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公开(公告)号：US20170298482A1
公开(公告)日：2017-10-19
申请号：US15516698
申请日：2015-10-29
IPC分类号： C22C38/14 , B32B15/01 , C23C2/40 , C23C2/12 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/46 , C21D8/02 , C21D6/00 , C21D1/26 , C23F17/00 , B32B15/18 , B32B15/20 , C25D3/22
摘要： Disclosed is a steel sheet having a predetermined chemical composition and a steel microstructure that contains, in area ratio, 15% or more and 55% or less of polygonal ferrite and 15% or more and 30% or less of martensite, and that contains, in volume fraction, 12% or more of retained austenite, in which the polygonal ferrite, the martensite, and the retained austenite have a mean grain size of 4 μm or less, 2 μm or less, and 2 μm or less, respectively, and each have a mean grain aspect ratio of 2.0 or less, and in which a value obtained by dividing an Mn content in the retained austenite in mass % by an Mn content in the polygonal ferrite in mass % equals 2.0 or more.
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