-
公开(公告)号：US20240318275A1
公开(公告)日：2024-09-26
申请号：US18579914
申请日：2022-06-22
发明人： Taiyo Asakawa , Shimpei Yoshioka , Shinjiro Kaneko
CPC分类号： C21D8/0226 , C21D8/0205 , C21D8/0236 , C21D8/0242 , C21D8/0273 , C21D8/0278 , C21D9/46 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12
摘要： A steel sheet contains, in mass %, C: 0.15 to 0.45%, Si: 1.5% or less, Mn: more than 1.7%, P: 0.03% or less, S: less than 0.0040%, sol .Al: 0.20% or less, N: 0.005% or less, B: 0.0015 to 0.0100%, and at least one of Nb and Ti in a total amount of 0.005 to 0.080%, with the balance being Fe and incidental impurities. The area fraction of martensite with respect to the total area of the microstructure is 95 to 100%, and the diameter of prior y grains is less than 11.2 μm. The number density A of precipitates having an equivalent circular diameter of 500 nm or more satisfies the formula: A (particles/mm2)≤8.5×105×[B].
-
公开(公告)号：US11795520B2
公开(公告)日：2023-10-24
申请号：US17432349
申请日：2019-11-21
IPC分类号： C21D8/02 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/06 , C23C2/02 , C21D9/48 , B32B15/01 , C21D6/00 , C22C38/00 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/16 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/60 , C23C2/40 , C23C2/12
CPC分类号： C21D9/48 , B32B15/012 , B32B15/013 , C21D6/002 , C21D6/005 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/10 , C22C38/12 , C22C38/16 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/60 , C23C2/40 , C21D2211/008 , C23C2/06 , C23C2/12
摘要： A hot-pressed member having excellent bending collapsibility, a method for manufacturing the same, and a method for manufacturing a steel sheet for the hot-pressed member. The hot-pressed member includes a steel sheet as a base material, the steel sheet having a specified chemical composition. The hot-pressed member has a microstructure in which a martensite microstructure is present in a volume fraction of 70% or greater, and a number density of inclusions having a longest diameter of 25 μm or greater is 0.02/mm2 or less. The hot-pressed member has a tensile strength of 1.8 GPa or greater.
-
公开(公告)号：US20200071784A1
公开(公告)日：2020-03-05
申请号：US15999603
申请日：2017-02-15
IPC分类号： C21D9/46 , C22C38/38 , C22C38/20 , C22C38/06 , C22C38/02 , C22C38/14 , C22C38/12 , C22C38/00 , C23G1/08 , C21D8/02 , C21D6/00 , C22C38/10
摘要： A high-strength cold-rolled steel sheet has a composition that contains, in terms of mass %, C: 0.10% or more and 0.50% or less, Si: 1.0% or more and 3.0% or less, Mn: 1.0% or more and 2.5% or less, P: 0.05% or less, S: 0.02% or less, Al: 0.01% or more and 1.5% or less, N: 0.005% or less, Cu: 0.05% or more and 0.50% or less, and the balance being Fe and unavoidable impurities, wherein a proportion of a steel sheet surface covered with oxides mainly composed of Si is 1% or less, a proportion of the steel sheet surface covered with Fe oxides is 40% or less, CuS/CuB is 4.0 or less, and a tensile strength is 1180 MPa or more, when CuS denotes the Cu content in a steel sheet surface layer and CuB denotes the Cu content in a base material.
-
公开(公告)号：US20240229181A9
公开(公告)日：2024-07-11
申请号：US18277883
申请日：2022-01-28
发明人： Katsuya Hata , Shimpei Yoshioka , Shinjiro Kaneko
IPC分类号： C21D9/46 , C21D1/18 , C21D1/84 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/38 , C22C38/60
CPC分类号： C21D9/46 , C21D1/18 , C21D1/84 , C21D6/001 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0278 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/38 , C22C38/60 , C21D2211/001 , C21D2211/002 , C21D2211/008
摘要： A steel sheet has a certain chemical composition and a steel microstructure containing, in area fraction, martensite: 40% or more and 78% or less, bainite: 20% or more and 58% or less, and retained austenite: 2% or more. Carbides in tempered martensite in the martensite have an average particle size of 0.40 μm or less, an average amount of C in the retained austenite is 0.5% by mass or more, a Si concentration in a region within 100 μm in a thickness direction from a surface of the steel sheet is 1.3% by mass or less, and a tensile strength is 1,470 MPa or more.
-
公开(公告)号：US20240132987A1
公开(公告)日：2024-04-25
申请号：US18277883
申请日：2022-01-28
发明人： Katsuya Hata , Shimpei Yoshioka , Shinjiro Kaneko
IPC分类号： C21D9/46 , C21D1/18 , C21D1/84 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/38 , C22C38/60
CPC分类号： C21D9/46 , C21D1/18 , C21D1/84 , C21D6/001 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0278 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/38 , C22C38/60 , C21D2211/001 , C21D2211/002 , C21D2211/008
摘要： A steel sheet has a certain chemical composition and a steel microstructure containing, in area fraction, martensite: 40% or more and 78% or less, bainite: 20% or more and 58% or less, and retained austenite: 2% or more. Carbides in tempered martensite in the martensite have an average particle size of 0.40 μm or less, an average amount of C in the retained austenite is 0.5% by mass or more, a Si concentration in a region within 100 μm in a thickness direction from a surface of the steel sheet is 1.3% by mass or less, and a tensile strength is 1,470 MPa or more.
-
公开(公告)号：US20230100311A1
公开(公告)日：2023-03-30
申请号：US17794431
申请日：2021-01-21
发明人： Shimpei Yoshioka , Shinjiro Kaneko , Yuma Honda
IPC分类号： C21D8/02 , C22C38/60 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/02 , C22C38/00 , C21D6/00 , C21D9/00 , B32B15/01 , C21D9/46 , C22C38/14 , C22C38/04 , C22C38/16
摘要： A steel sheet has a tensile strength of 1310 MPa or higher, a specified chemical composition, and a steel microstructure containing martensite at an area ratio of 70% or more, bainite at an area ratio of 30% or less, and ferrite and retained austenite at a total area ratio of 10% or less, in which, at a ¼ thickness position of the steel sheet, a number density of carbides having long axes of 0.5 μm or more is 60000 carbides/mm2 or less, in a ¼-to-¾ thickness region of the steel sheet, a number density of inclusion grains having equivalent circle diameters of 4.0 μm or more is 10 grains/mm2 or more and 30 grains/mm2 or less, and, in a surface-to-¼ thickness region of the steel sheet, a number density of inclusion grains having equivalent circle diameters of 4.0 μm or more is 27 grains/mm2 or less.
-
公开(公告)号：US11268164B2
公开(公告)日：2022-03-08
申请号：US16329504
申请日：2017-09-28
IPC分类号： C21D9/46 , C21D8/02 , C22C38/12 , C23C2/06 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/26 , C22C38/28 , C23C2/02 , C23C2/40 , C21D1/18 , C22C38/18 , C23C2/28 , C22C38/60
摘要： A steel sheet having a specified chemical composition and a method for producing the steel sheet. The steel sheet has a microstructure including martensite and bainite. The total area fraction of the martensite and the bainite to the entirety of the microstructure is 95% or more and 100% or less. The balance of the microstructure is at least one of ferrite and retained austenite. The microstructure includes specific inclusion clusters, the content of the inclusion clusters in the microstructure being 5 clusters/mm2 or less. The microstructure includes prior-austenite grains having an average size of more than 5 μm. The steel sheet has a tensile strength of 1320 MPa or more.
-
公开(公告)号：US20210332454A1
公开(公告)日：2021-10-28
申请号：US17270613
申请日：2019-08-22
发明人： Yoshihiko Ono , Yuma Honda , Shimpei Yoshioka , Koichi Taniguchi , Hiroshi Matsuda , Takeshi Murai , Nobuyuki Nakamura
IPC分类号： C21D9/46 , C21D8/02 , C23C2/06 , C21D6/00 , C22C38/58 , C22C38/54 , C22C38/50 , C22C38/48 , C22C38/46 , C22C38/44 , C22C38/42 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/60 , C23C2/40 , C23C2/02
摘要： A high-strength steel sheet of the present invention has a specific chemical composition. Furthermore, in the steel sheet, a degree of Mn segregation in a specific region is 1.5 or less; a maximum P concentration in a specific region is 0.08 mass % or less; in a specific region, at least one specific MnS particle group is present, the number of specific MnS particle groups is 2.0 or fewer per 1 mm2, and the number of specific oxide-based inclusions is 8 or fewer per 1 mm2; of all oxide-based inclusions, oxide-based inclusions having a specific composition are present in a number ratio of 80% or greater; the microstructure includes, in terms of a volume fraction, 30 to 95% martensite, 5 to 70% ferrite phase, less than 30% (and 0% or greater) bainite, and less than 2.0% (and 0% or greater) austenite phase; and a tensile strength is 980 MPa or greater.
-
公开(公告)号：US12071682B2
公开(公告)日：2024-08-27
申请号：US17415462
申请日：2019-10-25
发明人： Shimpei Yoshioka , Yoshihiko Ono , Yuma Honda , Nobuyuki Nakamura
IPC分类号： C22C38/58 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C23C2/02
CPC分类号： C22C38/58 , C21D8/0205 , C21D8/021 , C21D8/0226 , C21D8/0236 , C22C38/001 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C23C2/02 , C23C2/0224 , C23C2/024 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008
摘要： A steel sheet having a specified chemical composition and a tensile strength of 1,320 MPa or more, and methods for producing the steel sheet. The steel sheet has a specified microstructure including martensite and bainite, the total area fraction of the martensite and the bainite being 92% or more and 100% or less, the balance being one or more selected from ferrite and retained austenite. The forumulae [% Ti]+[% Nb]>0.007 and [% Ti]×[% Nb]2≤7.5×10−6 are satisfied in the chemical composition.
-
公开(公告)号：US20240229180A9
公开(公告)日：2024-07-11
申请号：US18277874
申请日：2022-01-28
发明人： Katsuya Hata , Shimpei Yoshioka , Shinjiro Kaneko
IPC分类号： C21D9/46 , C21D1/18 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/34 , C22C38/38 , C22C38/60
CPC分类号： C21D9/46 , C21D1/18 , C21D6/001 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0278 , C22C38/001 , C22C38/002 , C22C38/005 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/22 , C22C38/24 , C22C38/28 , C22C38/34 , C22C38/38 , C22C38/60 , C21D2211/001 , C21D2211/002 , C21D2211/008
摘要： A steel sheet has a chemical composition containing, by mass %, C: 0.20% or more and 0.40% or less, Si: more than 1.0% and 3.0% or less, Mn: 1.5% or more and 3.5% or less, P: 0.002% or more and 0.010% or less, S: 0.0002% or more and 0.0020% or less, sol. Al: 0.40% or less (not including 0%), and N: 0.0100% or less, with the balance being Fe and incidental impurities; and a steel microstructure containing, in area fraction, tempered martensite: 45% or more and 83% or less, bainite: 15% or more and 53% or less, and retained austenite: 2% or more. Carbides in the tempered martensite have an average particle size of 0.40 μm or less, an average amount of C in the retained austenite is 0.5% by mass or more, and a tensile strength is 1,470 MPa or more.
-
-
-
-
-
-
-
-
-
搜索结果
31 条记录 (耗时 0.027 秒)
