Patents by Inventor Yasuaki Naito
Yasuaki Naito 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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Publication number: 20250033137Abstract: A method for manufacturing a projection weld joint according to the present disclosure includes: pressing a projection portion of a steel member having the projection portion on a plane onto a surface of a hot-stamping steel sheet, wherein the hot-stamping steel sheet has an Al-based plating layer on the surface and has a tensile strength of 1.5 GPa or more; applying first energization to the hot-stamping steel sheet, the projection portion, and the steel member to make the projection portion serve as a projection weld; quenching the projection weld; and applying second energization to the quenched projection weld to temper edges of the projection weld while keeping a central part of the projection weld quenched.Type: ApplicationFiled: March 20, 2023Publication date: January 30, 2025Applicant: NIPPON STEEL CORPORATIONInventors: Masanori YASUYAMA, Yasuaki NAITO, Takashi IMAMURA, Masatoshi TOKUNAGA, Naoaki SHIMADA
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Publication number: 20240269773Abstract: This joint component includes: a first steel member; a second steel member; and a joint portion which is formed at butted portions between the first steel member and the second steel member and includes a weld metal and a heat-affected zone, in which the first steel member includes a steel sheet substrate and an Al—Fe-based coating formed on a surface of the steel sheet substrate, and has a tensile strength of more than 1,500 MPa, and when a cross section of the weld metal in a sheet thickness direction orthogonal to an extension direction of the joint portion is defined as a measuring surface, an average Cu content in the weld metal at the measuring surface is 0.03% or more and 3.00% or less by mass %.Type: ApplicationFiled: August 10, 2022Publication date: August 15, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Yasuaki NAITO, Shinichiro TABATA, Hideaki IRIKAWA, Kazuhisa KUSUMI
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Patent number: 11932104Abstract: A fuel tank (10) includes: a lower panel (12) made of steel and an upper panel (11) made of steel; and at least one pillar (100) made of steel which is disposed in an interior space (V) formed by the lower panel (12) and the upper panel (11) facing each other and of which a first end portion is fixed to the lower panel (12) and a second end portion is fixed to the upper panel (11) in a state where the second end portion is disposed in a hole formed in the upper panel (11).Type: GrantFiled: June 12, 2020Date of Patent: March 19, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Toshinori Mizuguchi, Masahiro Fuda, Akiyoshi Inoue, Junji Nakano, Yasuaki Naito
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Publication number: 20220332184Abstract: A fuel tank (10) includes: a lower panel (12) made of steel and an upper panel (11) made of steel; and at least one pillar (100) made of steel which is disposed in an interior space (V) formed by the lower panel (12) and the upper panel (11) facing each other and of which a first end portion is fixed to the lower panel (12) and a second end portion is fixed to the upper panel (11) in a state where the second end portion is disposed in a hole formed in the upper panel (11).Type: ApplicationFiled: June 12, 2020Publication date: October 20, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Toshinori MIZUGUCHI, Masahiro FUDA, Akiyoshi INOUE, Junji NAKANO, Yasuaki NAITO
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Patent number: 11371130Abstract: A hot-dip Sn—Zn-based alloy-plated steel sheet according to an aspect of the present invention includes: a steel sheet having a predetermined chemical composition; a diffusion alloy layer provided on one surface or both surfaces of the steel sheet; and a Sn—Zn-plated layer provided on the diffusion alloy layer, in which the diffusion alloy layer contains Fe, Sn, Zn, Cr, and Ni, an area ratio of a Sn—Fe—Cr—Zn phase to a Sn—Fe—Ni—Zn phase in the diffusion alloy layer is 0.01 or more and less than 2.5, the diffusion alloy layer has a coverage of 98% or more with respect to the one surface, the Sn—Zn-plated layer contains 1% to 20% of Zn by mass % and a remainder consisting of Sn and impurities, and an adhesion amount of the Sn—Zn-plated layer is 10 to 80 g/m2 per one surface.Type: GrantFiled: April 26, 2019Date of Patent: June 28, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Masahiro Fuda, Toshinori Mizuguchi, Junji Nakano, Yoshiharu Inoue, Kazuhisa Kusumi, Yasuaki Naito
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Publication number: 20210156017Abstract: A hot-dip Sn—Zn-based alloy-plated steel sheet according to an aspect of the present invention includes: a steel sheet having a predetermined chemical composition; a diffusion alloy layer provided on one surface or both surfaces of the steel sheet; and a Sn—Zn-plated layer provided on the diffusion alloy layer, in which the diffusion alloy layer contains Fe, Sn, Zn, Cr, and Ni, an area ratio of a Sn—Fe—Cr—Zn phase to a Sn—Fe—Ni—Zn phase in the diffusion alloy layer is 0.01 or more and less than 2.5, the diffusion alloy layer has a coverage of 98% or more with respect to the one surface, the Sn—Zn-plated layer contains 1% to 20% of Zn by mass % and a remainder consisting of Sn and impurities, and an adhesion amount of the Sn—Zn-plated layer is 10 to 80 g/m2 per one surface.Type: ApplicationFiled: April 26, 2019Publication date: May 27, 2021Applicant: Nippon Steel CorporationInventors: Masahiro FUDA, Toshinori MIZUGUCHI, Junji NAKANO, Yoshiharu INOUE, Kazuhisa KUSUMI, Yasuaki NAITO
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Patent number: 10807138Abstract: A tailored blank for hot stamping includes a welded portion formed by butt-welding a first aluminum-plated steel sheet and a second aluminum-plated steel sheet, an Average Al concentration of a weld metal in the welded portion is in a range of 0.3 mass % to 1.5 mass %, an Ac3 point of the weld metal is 1250° C. or lower, and furthermore, an aluminum layer formed during the butt-welding is present on a surface of the welded portion.Type: GrantFiled: January 5, 2018Date of Patent: October 20, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Yasunobu Miyazaki, Yasuaki Naito, Kaoru Kawasaki, Takahiro Yoshinaga
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Patent number: 10786873Abstract: A fillet arc welded joint formed by fillet arc welding at least two metal members, comprising a remelted and solidified portion obtained by irradiating a laser at a weld toe portion of the fillet arc welding of at least one metal member and a region including a boundary of the heat affected zone caused by the fillet arc welding at the surface of that metal member, the remelted and solidified portion being a range from a surface of the metal member to a depth of ½ or less of the thickness of that metal member, an average effective crystal grain diameter of prior austenite at a heat affected zone from a boundary of the remelted and solidified portion at the surface of the metal member to a depth of 0.1 mm in the thickness direction of the metal member being 20 ?m or less.Type: GrantFiled: July 28, 2016Date of Patent: September 29, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Shinji Kodama, Yujiro Tatsumi, Shoko Oami, Yasuaki Naito
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Patent number: 10722976Abstract: A laser welded joint excellent in joint strength preventing a bead from cracking and comprised of exactly the number of weld beads required for joint strength in overlay laser welding of steel sheets forming multiple ring-shaped weld beads, produced by a step of overlaying a plurality of metal sheets and forming a first weld bead and a step of firing a laser beam to successively form a further two or more weld beads at the outside of the first weld bead by laser irradiation, the surface hardness of the weld bead increasing from the inside bead to the outside bead.Type: GrantFiled: September 17, 2015Date of Patent: July 28, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Yasuaki Naito, Yasunobu Miyazaki
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Patent number: 10697486Abstract: A laser welded joint has weld metal provided between a plurality of steel sheets. A chemical composition of the weld metal has predetermined components, and average hardness of the weld metal is 350 to 540 in Vickers hardness. In the weld metal, distribution density of porosities having a diameter of 2 ?m to 50 ?m is equal to or less than 5.0 pieces/mm2. In the weld metal, distribution density of oxide inclusions having a diameter of 3 ?m or more is 0.1 to 8.0 pieces/mm2.Type: GrantFiled: November 19, 2015Date of Patent: June 30, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Naoki Maruyama, Yasuaki Naito, Shigeru Yonemura, Yasunobu Miyazaki, Takuya Kuwayama
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Publication number: 20180207751Abstract: A fillet arc welded joint formed by fillet arc welding at least two metal members, comprising a remelted and solidified portion obtained by irradiating a laser at a weld toe portion of the fillet arc welding of at least one metal member and a region including a boundary of the heat affected zone caused by the fillet arc welding at the surface of that metal member, the remelted and solidified portion being a range from a surface of the metal member to a depth of ½ or less of the thickness of that metal member, an average effective crystal grain diameter of prior austenite at a heat affected zone from a boundary of the remelted and solidified portion at the surface of the metal member to a depth of 0.1 mm in the thickness direction of the metal member being 20 ?m or less.Type: ApplicationFiled: July 28, 2016Publication date: July 26, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shinji KODAMA, Yujiro TATSUMI, Shoko OAMI, Yasuaki NAITO
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Publication number: 20180126437Abstract: A tailored blank for hot stamping includes a welded portion formed by butt-welding a first aluminum-plated steel sheet and a second aluminum-plated steel sheet, an Average Al concentration of a weld metal in the welded portion is in a range of 0.3 mass % to 1.5 mass %, an Ac3 point of the weld metal is 1250° C. or lower, and furthermore, an aluminum layer formed during the butt-welding is present on a surface of the welded portion.Type: ApplicationFiled: January 5, 2018Publication date: May 10, 2018Applicant: Nippon Steel & Sumitomo Metal CorporationInventors: Yasunobu Miyazaki, Yasuaki Naito, Kaoru Kawasaki, Takahiro Yoshinaga
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Patent number: 9901969Abstract: A tailored blank for hot stamping includes a welded portion formed by butt-welding a first aluminum-plated steel sheet and a second aluminum-plated steel sheet, an Average Al concentration of a weld metal in the welded portion is in a range of 0.3 mass % to 1.5 mass %, an Ac3 point of the weld metal is 1250° C. or lower, and furthermore, an aluminum layer formed during the butt-welding is present on a surface of the welded portion.Type: GrantFiled: March 28, 2013Date of Patent: February 27, 2018Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Yasunobu Miyazaki, Yasuaki Naito, Kaoru Kawasaki, Takahiro Yoshinaga
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Publication number: 20170350434Abstract: A laser welded joint has weld metal provided between a plurality of steel sheets. A chemical composition of the weld metal has predetermined components, and average hardness of the weld metal is 350 to 540 in Vickers hardness. In the weld metal, distribution density of porosities having a diameter of 2 ?m to 50 ?m is equal to or less than 5.0 pieces/mm2. In the weld metal, distribution density of oxide inclusions having a diameter of 3 ?m or more is 0.1 to 8.0 pieces/mm2.Type: ApplicationFiled: November 19, 2015Publication date: December 7, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Naoki MARUYAMA, Yasuaki NAITO, Shigeru YONEMURA, Yasunobu MIYAZAKI, Takuya KUWAYAMA
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Publication number: 20170274473Abstract: The present invention has as its object to provide a laser welded joint excellent in joint strength preventing a bead from cracking and comprised of exactly the number of weld beads required for joint strength and a laser welding method for the same in overlay laser welding of steel sheets forming multiple ring-shaped weld beads. The present invention is a laser welded joint excellent in joint strength preventing a bead from cracking and comprised of exactly the number of weld beads required for joint strength in overlay laser welding of steel sheets forming multiple ring-shaped weld beads, produced by a step of overlaying a plurality of metal sheets and forming a first weld bead and a step of firing a laser beam to successively form a further two or more weld beads at the outside of the first weld bead by laser irradiation, the surface hardness of the weld bead increasing from the inside bead to the outside bead.Type: ApplicationFiled: September 17, 2015Publication date: September 28, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Yasuaki NAITO, Yasunobu MIYAZAKI
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Patent number: 9649725Abstract: At a plurality of welding positions in an overlap portion of a plurality of members including a high-tensile steel sheet whose carbon content is 0.07 weight % or more, first beads (31 to 36) in a closed loop shape or a closed loop-like shape and second beads (41 to 46) in a closed loop shape or a closed loop-like shape on inner sides of the first bead (31 to 36) are formed by remote laser welding for joining. At this time, there are a procedure for successively forming the plural first beads (31 to 36) and a procedure for successively forming the plural second beads (41 to 46) for the plural formed first beads (31 to 36), and in both of the cases, the beads are each formed at a position except the closest welding position among the plural welding positions. Consequently, it is possible to enhance strength of a weld zone and to suppress welding deformation.Type: GrantFiled: October 12, 2011Date of Patent: May 16, 2017Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Seiji Furusako, Yasunobu Miyazaki, Yasuaki Naito
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Publication number: 20160008906Abstract: A solid wire for gas shielded arc welding comprising the following in terms of mass-% with respect to a total mass of the wire including plating: C: from 0.03 to 0.15%, Si: from 0.2 to 0.5%, Mn: from 0.3 to 0.8%, P: 0.02% or less, S: 0.02% or less, Al: from 0.1 to 0.3%, Ti: from 0.001 to 0.2%, Cu: from 0 to 0.5%, Cr: from 0 to 2.5%, Nb: from 0 to 1.0%, and V: from 0 to 1.0%, wherein the balance is Fe and impurities, and the following value of X is in a range of from 1.5 to 3.5 mass %. A welding metal, wherein the X value of the following formula is in a range of from 1.0 to 4.0%. Further, a welded joint, a weldment, and a welding method of the welded joint, utilizing the solid wire or the weld metal.Type: ApplicationFiled: February 17, 2014Publication date: January 14, 2016Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Tasuku ZENIYA, Shinji KODAMA, Shoko TSUCHIYA, Yasuaki NAITO
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Publication number: 20150043962Abstract: A tailored blank for hot stamping includes a welded portion formed by butt-welding a first aluminum-plated steel sheet and a second aluminum-plated steel sheet, an Average Al concentration of a weld metal in the welded portion is in a range of 0.3 mass % to 1.5 mass %, an Ac3 point of the weld metal is 1250° C. or lower, and furthermore, an aluminum layer formed during the butt-welding is present on a surface of the welded portion.Type: ApplicationFiled: March 28, 2013Publication date: February 12, 2015Inventors: Yasunobu Miyazaki, Yasuaki Naito, Kaoru Kawasaki, Takahiro Yoshinaga
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Publication number: 20130168371Abstract: At a plurality of welding positions in an overlap portion of a plurality of members including a high-tensile steel sheet whose carbon content is 0.07 weight % or more, first beads (31 to 36) in a closed loop shape or a closed loop-like shape and second beads (41 to 46) in a closed loop shape or a closed loop-like shape on inner sides of the first bead (31 to 36) are formed by remote laser welding for joining. At this time, there are a procedure for successively forming the plural first beads (31 to 36) and a procedure for successively forming the plural second beads (41 to 46) for the plural formed first beads (31 to 36), and in both of the cases, the beads are each formed at a position except the closest welding position among the plural welding positions. Consequently, it is possible to enhance strength of a weld zone and to suppress welding deformation.Type: ApplicationFiled: October 12, 2011Publication date: July 4, 2013Inventors: Seiji Furusako, Yasunobu Miyazaki, Yasuaki Naito