Patents by Inventor Shinsuke Kai
Shinsuke Kai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11970758Abstract: This hot-rolled steel sheet has a predetermined chemical composition. The metallographic structure at a sheet thickness ¼ depth from a surface and at a center position in a sheet width direction in a sheet width cross section parallel to a rolling direction contains, by area %, 77.0% to 97.0% of bainite and tempered martensite in total, 0% to 5.0% of ferrite, 0% to 5.0% of pearlite, 3.0% or more of residual austenite, and 0% to 10.0% of martensite. The average grain size of the metallographic structure excluding the residual austenite is 7.0 ?m or less. The C concentration in the residual austenite is 0.5 mass % or more. The number density of iron-based carbides having a diameter of 20 nm or more is 1.0×106 carbides/mm2 or more.Type: GrantFiled: October 21, 2019Date of Patent: April 30, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Hiroshi Shuto, Akifumi Sakakibara, Shinsuke Kai, Koutarou Hayashi, Hiroshi Kaido
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Patent number: 11920975Abstract: Aspects of the present disclosure are directed to alternative repeater design(s) that advantageously improve signal-to-noise of distributed acoustic sensing (DAS) systems using coherent detection of Rayleigh backscatter in multi-span links including inline amplification that may be employed—for example—in undersea submarine systems. The repeater designs incorporate Rayleigh combine units (RCU) and Rayleigh drop units (RDU) to reduce Rayleigh backscatter loss as Rayleigh signal(s) is/are routed to a link that propagates the backscatter signal in an opposite direction relative to interrogation pulse(s).Type: GrantFiled: May 6, 2021Date of Patent: March 5, 2024Assignee: NEC CorporationInventors: Ezra Ip, Yue-Kai Huang, Fatih Yaman, Shinsuke Fujisawa
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Publication number: 20230349017Abstract: This hot-rolled steel sheet has a predetermined chemical composition, the number % of crystal grains of bainite that are in contact with both tempered martensite and residual austenite is 80% or more of all crystal grains of the bainite, a C concentration in the residual austenite is 0.80 mass % or more, an average crystal grain size of the residual austenite is 0.70 ?m or less, and a standard deviation of Vickers hardness is 25 HV0.01 or less.Type: ApplicationFiled: March 8, 2021Publication date: November 2, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Mutsumi SAKAKIBARA, Hiroshi SHUTO, Hiroshi TANEI, Takaaki TSUTSUMI, Shota ISHITSUKA, Shinsuke KAI, Akifumi SAKAKIBARA
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Patent number: 11255005Abstract: A hot-rolled steel sheet includes, by mass %, C: 0.030% or more and less than 0.075%, Si+Al: 0.08% to 0.40%, Mn: 0.5% to 2.0%, and Ti: 0.020% to 0.150%, and includes a microstructure having a ferrite and a martensite. The hot-rolled steel sheet includes a microstructure having, by area %, 90% to 98% of the ferrite, 2% to 10% of the martensite, 0% to 3% of a bainite, and 0% to 3% of a pearlite. In the martensite, the number proportion of martensite grains having a hardness of 10.0 GPa or more is 10% or less, and a ratio N1/N2 of the number N1 of martensite grains having a hardness of 8.0 GPa or more and less than 10.0 GPa to the number N2 of martensite grains having a hardness of less than 8.0 GPa is 0.8 to 1.2.Type: GrantFiled: August 18, 2016Date of Patent: February 22, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Daisuke Maeda, Hiroshi Shuto, Kazuya Ootsuka, Akifumi Sakakibara, Shinsuke Kai
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Publication number: 20220010396Abstract: This hot-rolled steel sheet has a predetermined chemical composition, and in a case where the thickness is denoted by t, the metallographic structure at a t/4 position from the surface contains one or both of tempered martensite and lower bainite at a volume percentage of 90% or more, the tensile strength is 980 MPa or more, and the average Ni concentration on the surface is 7.0% or more.Type: ApplicationFiled: October 21, 2019Publication date: January 13, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Tatsuo YOKOI, Teruki HAYASHIDA, Mutsumi SAKAKIBARA, Jun ANDO, Shinsuke KAI, Hiroshi SHUTO
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Publication number: 20210381086Abstract: This hot-rolled steel sheet has a predetermined chemical composition. The metallographic structure at a sheet thickness ¼ depth from a surface and at a center position in a sheet width direction in a sheet width cross section parallel to a rolling direction contains, by area %, 77.0% to 97.0% of bainite and tempered martensite in total, 0% to 5.0% of ferrite, 0% to 5.0% of pearlite, 3.0% or more of residual austenite, and 0% to 10.0% of martensite. The average grain size of the metallographic structure excluding the residual austenite is 7.0 ?m or less. The C concentration in the residual austenite is 0.5 mass % or more. The number density of iron-based carbides having a diameter of 20 nm or more is 1.0×106 carbides/mm2 or more.Type: ApplicationFiled: October 21, 2019Publication date: December 9, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Hiroshi SHUTO, Akifumi SAKAKIBARA, Shinsuke KAI, Koutarou HAYASHI, Hiroshi KAIDO
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Patent number: 10512958Abstract: A plurality of water removing nozzles of a water removing apparatus comprise one or more of a single far water removing nozzle and a far water removing nozzle group. The single far water removing nozzle forms a far end water removal single area that does not include one end but includes the other end in the width direction of a steel sheet conveyance plane. The far water removing nozzle group forms the far end water removal single area and one or more inner water removal single areas that do not include either end in the width direction of the steel sheet conveyance plane, in such a manner that the far end water removal single area and the one or more inner water removal single areas are aligned in order from the one end side to the other end side while overlapping with each other in the width direction of the steel sheet conveyance plane and aligned in order from the upstream side to the downstream side without overlapping in the conveyance direction.Type: GrantFiled: June 17, 2015Date of Patent: December 24, 2019Assignee: NIPPON STEEL CORPORATIONInventors: Yoshihiro Serizawa, Shinsuke Kai
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Publication number: 20190177822Abstract: A hot-rolled steel sheet includes, by mass %, C: 0.030% or more and less than 0.075%, Si+Al: 0.08% to 0.40%, Mn: 0.5% to 2.0%, and Ti: 0.020% to 0.150%, and includes a microstructure having a ferrite and a martensite. The hot-rolled steel sheet includes a microstructure having, by area %, 90% to 98% of the ferrite, 2% to 10% of the martensite. 0% to 3% of a bainite, and 0% to 3% of a pearlite. In the martensite, the number proportion of martensite grains having a hardness of 10.0 GPa or more is 10% or less, and a ratio N1/N2 of the number N1 of martensite grains having a hardness of 8.0 GPa or more and less than 10.0 GPa to the number N2 of martensite grains having a hardness of less than 8.0 GPa is 0.8 to 1.2.Type: ApplicationFiled: August 18, 2016Publication date: June 13, 2019Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Daisuke MAEDA, Hiroshi SHUTO, Kazuya OOTSUKA, Akifumi SAKAKIBARA, Shinsuke KAI
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Publication number: 20170136512Abstract: A plurality of water removing nozzles of a water removing apparatus comprise one or more of a single far water removing nozzle and a far water removing nozzle group. The single far water removing nozzle forms a far end water removal single area that does not include one end but includes the other end in the width direction of a steel sheet conveyance plane. The far water removing nozzle group forms the far end water removal single area and one or more inner water removal single areas that do not include either end in the width direction of the steel sheet conveyance plane, in such a manner that the far end water removal single area and the one or more inner water removal single areas are aligned in order from the one end side to the other end side while overlapping with each other in the width direction of the steel sheet conveyance plane and aligned in order from the upstream side to the downstream side without overlapping in the conveyance direction.Type: ApplicationFiled: June 17, 2015Publication date: May 18, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Yoshihiro SERIZAWA, Shinsuke KAI
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Patent number: 5944644Abstract: A roll of a winding equipment in a rolling factory is formed of a roll body, a hardened buildup substrate formed on a surface of the roll body, and a carbide-particle-dispersed-type autogenous-alloy-sprayed layer having a thickness of at least 0.5 mm and formed on the substrate. The autogenous-alloy-sprayed layer contains 3-60% by weight of carbide particles or complex carbide particles. The carbide particles or complex carbide particles have a particulate shape or a leaf shape with a size of 3-300 .mu.m. The roll can exhibit good abrasion resistance and plate flaw resistance, and good conveyance property for a passing plate material.Type: GrantFiled: April 18, 1997Date of Patent: August 31, 1999Assignee: Nippon Steel Hardfacing Co., Ltd.Inventors: Toshiyuki Katayama, Shinsuke Kai, Sakuhiko Kumade