Patents by Inventor Hiroshi Shuto
Hiroshi Shuto 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: 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: 20220049092Abstract: Provided is a polycarbonate resin composition having excellent impact strength, molding residence stability, and dry heat resistance and that maintains high total light transmittance while suppressing light transmittance in a specific ultraviolet region, that is, harmful wavelengths near 420 nm. The polycarbonate resin composition of the present disclosure includes 0.1-1.5 mass part of an additive (B) per 100 mass parts of a polycarbonate resin (A) having a viscosity average molecular weight of 21,000-26,000 and includes 0.Type: ApplicationFiled: February 25, 2020Publication date: February 17, 2022Applicants: TEIJIN LIMITED, MIYOSHI OIL & FAT CO., LTD.Inventors: Yoji OHIRA, Hiroshi SHUTO, Seiichi TANABE, Hideki ISSHIKI, Koji KAWAI, Kotaro KANEKO, Nobuhiro KANEKO, Akira YASHITA, Daisuke NAKAMURA
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Publication number: 20220042147Abstract: A hot-rolled steel sheet according to the present invention has a predetermined chemical composition, in which, when a height profile of a surface of the hot-rolled steel sheet is measured in each of five measurement ranges in a rolling direction and a direction perpendicular to the rolling direction, a distance in a height direction from an average height position which is an average of a height position of a point having a highest height position and a height position of a recessed part which is a point having a lowest height position to the recessed part is indicated as R1 (?m) in each of the height profiles, and an average of heights of two measurement points away from the recessed part in the rolling direction or the direction perpendicular to the rolling direction by 5 ?m is indicated as R2 (?m), an average value of radii of curvature r represented by Expression (1) is 10 ?m or more, and a tensile strength of the hot-rolled steel sheet is 500 MPa or more. r=(25+|R2?R1|2)/2|R2?R1| . . .Type: ApplicationFiled: March 5, 2020Publication date: February 10, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Hiroshi SHUTO, Genki ABUKAWA, Akifumi SAKAKIBARA, Jun ANDO, Tetsu ASATO, Shota ENDO
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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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Patent number: 11208702Abstract: There is provided a hot-rolled steel sheet in which a composition contains: in mass %, C: 0.01% to 0.2%; Si: 2.5% or less; Mn: 4.0% or less; P: 0.10% or less; S: 0.03% or less; Al: 0.001% to 2.0%; N: 0.01% or less; O: 0.01% or less; Ti: 0.01 to 0.30%; and the balance being composed of iron and impurities and a structure is composed of by volume fraction, 90% or more of tempered martensite with an average aspect ratio of 2 or less, or 90% or more in total of both tempered martensite and lower bainite.Type: GrantFiled: January 31, 2019Date of Patent: December 28, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Akifumi Sakakibara, Tatsuo Yokoi, Hiroshi Shuto, Yuuki Kanzawa, Masafumi Azuma
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Publication number: 20210395852Abstract: This hot-rolled steel sheet has a predetermined chemical composition, in which in a case where the thickness is denoted by t, a metallographic structure at a t/4 position from the surface includes, by area fraction, 77.0% to 97.0% of bainite or tempered martensite, 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, in the metallographic structure, the average grain size excluding the residual austenite is 7.0 ?m or less, the average number density of iron-based carbides having a diameter of 20 nm or more is 1.0×106 carbides/mm2 or more, a tensile strength is 980 MPa or more, and an average Ni concentration on the surface is 7.0% or more.Type: ApplicationFiled: October 21, 2019Publication date: December 23, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Tatsuo YOKOI, Hiroshi SHUTO, Teruki HAYASHIDA, Jun ANDO, Mutsumi SAKAKIBARA
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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: 10913988Abstract: A hot-rolled steel sheet includes a predetermined chemical composition, and a structure which include, by area ratio, ferrite and bainite in a range of 80% to 98% in total, and martensite in a range of 2% to 10%, in which in the structure, in a case where a boundary having an orientation difference of equal to or greater than 15° is defined as a grain boundary, and an area which is surrounded by the grain boundary, and has an equivalent circle diameter of equal to or greater than 0.3 ?m is defined as a grain, the ratio of the grains having an intragranular orientation difference in a range of 5° to 14° is, by area ratio, in a range of 10% to 60%.Type: GrantFiled: February 22, 2016Date of Patent: February 9, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Hiroshi Shuto, Natsuko Sugiura, Mitsuru Yoshida, Tatsuo Yokoi, Masayuki Wakita
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Patent number: 10752972Abstract: A hot-rolled steel sheet includes a predetermined chemical composition, and a structure which includes, by area ratio, a ferrite in a range of 5% to 60% and a bainite in a range of 30% to 95%, in which in the structure, in a case where a boundary having an orientation difference of equal to or greater than 15° is defined as a grain boundary, and an area which is surrounded by the grain boundary and has an equivalent circle diameter of equal to or greater than 0.3 ?m is defined as a grain, the ratio of the grains having an intragranular orientation difference in a range of 5° to 14° is, by area ratio, in a range of 20% to 100%.Type: GrantFiled: February 22, 2016Date of Patent: August 25, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Natsuko Sugiura, Mitsuru Yoshida, Hiroshi Shuto, Tatsuo Yokoi, Masayuki Wakita
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Patent number: 10689737Abstract: A hot-rolled steel sheet includes a chemical composition represented by, in mass %, C: 0.010% to 0.100%, Si: 0.30% or less, Cr: 0.05% to 1.00%, Nb: 0.003% to 0.050%, Ti: 0.003% to 0.200% and others, wherein a proportion of grains having an intragranular misorientation of 5° to 14° in all grains is 20% or more by area ratio, the grain being defined as an area which is surrounded by a boundary having a misorientation of 15° or more and has a circle-equivalent diameter of 0.3 ?m or more.Type: GrantFiled: February 25, 2015Date of Patent: June 23, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Masayuki Wakita, Mitsuru Yoshida, Natsuko Sugiura, Hiroshi Shuto, Tatsuo Yokoi
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Patent number: 10689724Abstract: There is provided a steel sheet with strain induced transformation type composite structure having a predetermined chemical composition in which a microstructure at the ¼ thickness of the steel sheet includes, by area ratio, 50% to 85% of a polygonal ferrite, 3% to 10% of a residual austenite, 5% to 47% of bainite and 1% or less of a fresh martensite and a tempered martensite in total and satisfies the equation of 0.01<Ex.C/fsd?0.015, the microstructure includes 1×1016 pieces/cm3 or more of precipitates containing TiC, an average grain diameter of the residual austenite 1.0 ?m to 5.0 ?m at an equivalent circle diameter, an average of closest distances of the austenite is 3.0 ?m to 10.0 ?m, and an average diameter of the precipitates is 3 nm or less.Type: GrantFiled: July 31, 2015Date of Patent: June 23, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Tatsuo Yokoi, Hiroshi Shuto, Yuuki Kanzawa, Natsuko Sugiura
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Patent number: 10364478Abstract: The present invention provides a bainite-containing-type high-strength hot-rolled steel sheet. The steel sheet, containing C: greater than 0.07 to 0.2%, Si: 0.001 to 2.5%, Mn: 0.01 to 4%, P: 0.15% or less, S: 0.03% or less, N: 0.01% or less, Al: 0.001 to 2% and a balance being composed of Fe and impurities, has an average value of pole densities of the {100}<011> to {223}<110> orientation group at a sheet thickness center portion being a range of ? to ? in sheet thickness from the surface of the steel sheet is 4.0 or less, and a pole density of the {332}<113> crystal orientation is 4.8 or less, an average crystal grain diameter is 10 ?m or less and vTrs is ?20° C. or lower, and a microstructure is composed of 35% or less in a structural fraction of pro-eutectoid ferrite and a balance of a low-temperature transformation generating phase.Type: GrantFiled: January 20, 2017Date of Patent: July 30, 2019Assignee: NIPPON STEEL CORPORATIONInventors: Tatsuo Yokoi, Hiroshi Shuto, Riki Okamoto, Nobuhiro Fujita, Kazuaki Nakano, Takeshi Yamamoto
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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: 20190161820Abstract: There is provided a hot-rolled steel sheet in which a composition contains: in mass %, C: 0.01% to 0.2%; Si: 2.5% or less; Mn: 4.0% or less; P: 0.10% or less; S: 0.03% or less; Al: 0.001% to 2.0%; N: 0.01% or less; 0: 0.01% or less; Ti: 0.01 to 0.30%; and the balance being composed of iron and impurities and a structure is composed of by volume fraction, 90% or more of tempered martensite with an average aspect ratio of 2 or less, or 90% or more in total of both tempered martensite and lower bainite.Type: ApplicationFiled: January 31, 2019Publication date: May 30, 2019Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Akifumi SAKAKIBARA, Tatsuo YOKOI, Hiroshi SHUTO, Yuuki KANZAWA, Masafumi AZUMA
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Patent number: 10260124Abstract: There is provided a hot-rolled steel sheet in which a composition contains: in mass %, C: 0.01% to 0.2%; Si: 2.5% or less; Mn: 4.0% or less; P: 0.10% or less; S: 0.03% or less; Al: 0.001% to 2.0%; N: 0.01% or less; O: 0.01% or less; Ti: 0.01 to 0.30%; and the balance being composed of iron and impurities and a structure is composed of by volume fraction, 90% or more of tempered martensite with an average aspect ratio of 2 or less, or 90% or more in total of both tempered martensite and lower bainite.Type: GrantFiled: May 13, 2014Date of Patent: April 16, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Akifumi Sakakibara, Tatsuo Yokoi, Hiroshi Shuto, Yuuki Kanzawa, Masafumi Azuma
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Patent number: 10226800Abstract: A hot-rolled steel sheet according to the present invention has a chemical composition comprising, in mass %, C: 0.03 to 0.2%, Mn: 0.1 to 3.0%, P: 0.10% or less, S: 0.03% or less, Al+Si: 0.2 to 3.0%, N: more than 0% and equal to or less than 0.01%, O: more than 0% and equal to or less than 0.01%, and the balance: iron and impurities. A microstructure of the hot-rolled steel sheet contains bainite as the main constituent, and contains hard phases constituted by martensite and/or austenite in an amount of, in area fraction, equal to or more than 3% and less than 20% where 60% or more of the hard phase present in a sheet-thickness central portion have an aspect ratio of 3 or more, the hard phases present in the sheet-thickness central portion have a length in a rolling direction of less than 20 ?m, and the sum of X-ray random intensity ratios of <011> orientation and <111> orientation as viewed from the rolling direction is 3.Type: GrantFiled: July 13, 2015Date of Patent: March 12, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hiroshi Shuto, Tatsuo Yokoi, Daisuke Maeda, Eisaku Sakurada, Takeshi Toyoda
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Patent number: 10196726Abstract: Provided is a high-strength hot-rolled steel sheet consisting of, in mass %, C: 0.01% to 0.2%, Si: 0% to 2.5%, Mn: 0% to 4.0%, Al: 0% to 2.0%, N: 0% to 0.01%, Cu: 0% to 2.0%, Ni: 0% to 2.0%, Mo: 0% to 1.0%, V: 0% to 0.3%, Cr: 0% to 2.0%, Mg: 0% to 0.01%, Ca: 0% to 0.01%, REM: 0% to 0.1%, B: 0% to 0.01%, P: less than or equal to 0.10%, S: less than or equal to 0.03%, O: less than or equal to 0.01%, one or both of Ti and Nb: 0.01% to 0.30% in total, and the balance being Fe and inevitable impurities. The steel sheet has a structure in which a total volume fraction of tempered martensite or lower bainite is 90% or more, a dislocation density thereof is greater than or equal to 5×1013 (1/m2) and less than or equal to 1×1016 (1/m2) and 1×106 (numbers/mm2) or more iron-based carbides are included therein.Type: GrantFiled: February 25, 2014Date of Patent: February 5, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masafumi Azuma, Hiroshi Shuto, Tatsuo Yokoi, Yuuki Kanzawa, Akihiro Uenishi
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Patent number: 10087499Abstract: There are provided a high-strength hot-rolled steel sheet securing low-temperature toughness and having excellent stretch flangeability by controlling a structural fraction and a hardness difference among structures, and a manufacturing method thereof. A hot-rolled steel sheet contains: C: 0.01 to 0.2%; Si: 0.001 to 2.5% or less; Mn: 0.10 to 4.0% or less; P: 0.10% or less; S: less than 0.03%; Al: 0.001 to 2.0%; N: less than 0.01%; Ti: (0.005+48/14[N]+48/32[S]) % or more and 0.3% or less; Nb: 0 to 0.06%; Cu: 0 to 1.2%; Ni: 0 to 0.6%; Mo: 0 to 1%; V: 0 to 0.2%; Cr: 0 to 2%; Mg: 0 to 0.01%; Ca: 0 to 0.01%; REM: 0 to 0.1%; and B: 0 to 0.002%, and has: an texture in which, at a central portion of a sheet thickness located between ? to ? thickness positions of the sheet thickness from a surface of the steel sheet, an average value of X-ray random intensity ratios of a group of {100}<011> to {223}<110> orientations of a sheet plane is 6.Type: GrantFiled: December 27, 2012Date of Patent: October 2, 2018Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Hiroshi Shuto, Tatsuo Yokoi, Yuuki Kanzawa, Nobuhiro Fujita, Ryohta Niiya, Shinya Saitoh
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Publication number: 20180216206Abstract: There is provided a steel sheet with strain induced transformation type composite structure having a predetermined chemical composition in which a microstructure at the ¼ thickness of the steel sheet includes, by area ratio, 50% to 85% of a polygonal ferrite, 3% to 10% of a residual austenite, 5% to 47% of bainite and 1% or less of a fresh martensite and a tempered martensite in total and satisfies the equation of 0.01<Ex.C/fsd?0.015, the microstructure includes 1×1016 pieces/cm3 or more of precipitates containing TiC, an average grain diameter of the residual austenite 1.0 ?m to 5.0 ?m at an equivalent circle diameter, an average of closest distances of the austenite is 3.0 ?m to 10.0 ?m, and an average diameter of the precipitates is 3 nm or less.Type: ApplicationFiled: July 31, 2015Publication date: August 2, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Tatsuo YOKOI, Hiroshi SHUTO, Yuuki KANZAWA, Natsuko SUGIURA
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Patent number: 10023929Abstract: A hot-rolled steel sheet has a composition containing: in mass %, C: 0.01 to 0.2%; Si: 2.5% or less; Mn: 4.0% or less; P: 0.10% or less; S: 0.03% or less; Al: 0.001 to 2.0%; N: 0.01% or less; and O: 0.01% or less, and one kind or a total of two kinds of Ti and Nb for 0.01 to 0.30%. An average effective crystal grain diameter at a sheet thickness ¼ part is 10 ?m or less, and an average effective crystal grain diameter at a part of a range of 50 ?m from a surface is 6 ?m or less. A structure of the steel sheet is tempered martensite or lower bainite, and a volume fraction thereof is 90% or more as a total.Type: GrantFiled: May 16, 2014Date of Patent: July 17, 2018Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hiroshi Shuto, Masafumi Azuma, Akifumi Sakakibara, Yuuki Kanzawa, Ken Kimura