Patents by Inventor Akihiro SENGOKU
Akihiro SENGOKU 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: 11884998Abstract: Provided is a surface treated steel sheet which includes a base metal, and a plated layer formed on a surface of the base metal, wherein an average composition of the plated layer contains, in mass %, Mg: 0.5 to 2.0%, and [60.0?Zn+Al?98.0], [0.4?Zn/Al?1.5], and [Zn/Al×Mg?1.6] are satisfied.Type: GrantFiled: March 31, 2017Date of Patent: January 30, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Akihiro Sengoku, Hiroshi Takebayashi
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Patent number: 11878488Abstract: A hot stamped component, includes: a base material; and a Zn-based plating layer provided in contact with the base material as an upper layer of the base material and containing Zn and Ni. A region of the Zn-based plating layer on a base material side is a Fe—Zn solid solution containing Ni, and two or more twins exist in 10 crystal grains of the Fe—Zn solid solution containing Ni adjacent to an interface between the base material and the Zn-based plating layer.Type: GrantFiled: March 23, 2020Date of Patent: January 23, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Akihiro Sengoku, Kojiro Akiba, Satoshi Kato
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Patent number: 11866828Abstract: A plated steel sheet for hot stamping including a base metal and a galvanized layer that is formed on a surface of the base metal, wherein the galvanized layer includes a galvannealed layer, a solidified zinc layer, and an oxide layer containing Al, in this order from the base metal, and a proportion of a content of Zn (g/m2) in the solidified zinc layer to a content of Zn (g/m2) in the galvanized layer is 10 to 95%.Type: GrantFiled: March 9, 2021Date of Patent: January 9, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Hiroshi Takebayashi, Kojiro Akiba, Akihiro Sengoku
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Patent number: 11846027Abstract: A hot stamped component, includes: a base material; and a Zn-based plating layer provided in contact with the base material as a layer above the base material and containing Zn. A base material side of the Zn-based plating layer is a Fe—Zn solid solution, and two or more twins exist in 10 crystal grains of the Fe—Zn solid solution adjacent to an interface between the base material and the Zn-based plating layer.Type: GrantFiled: March 23, 2020Date of Patent: December 19, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Akihiro Sengoku, Kojiro Akiba, Toshiki Nonaka
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Publication number: 20230220557Abstract: This Zn-plated hot stamped product includes a steel, a Zn-based plating layer, and an oxide layer, in which an upper layer which is a region on a surface side of the Zn-based plating layer has a two-phase structure of a ? phase and an Fe—Zn solid solution, and a lower layer which is a region of the Zn-based plating layer excluding the upper layer has a single-phase structure of an Fe—Zn solid solution, an upper layer thickness and a lower layer thickness satisfy the following expression, a Mn content ratio of Max. Mn/Min. Mn, which is a ratio of a maximum value Max. Mn to a minimum value Min. Mn of an Mn content on a surface of the Zn-plated hot stamped product, is 10.0 or less, and an average value Ave. Mn is 0.5 to 7.5% by mass %. 0.20?upper layer thickness/(upper layer thickness+lower layer thickness)?0.Type: ApplicationFiled: October 30, 2020Publication date: July 13, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Akihiro SENGOKU, Kojiro AKIBA, Hiroshi TAKEBAYASHI, Toshiki NONAKA
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Publication number: 20230073024Abstract: A plated steel sheet for hot stamping including a base metal and a galvanized layer that is formed on a surface of the base metal, wherein the galvanized layer includes a galvannealed layer, a solidified zinc layer, and an oxide layer containing Al, in this order from the base metal, and a proportion of a content of Zn (g/m2) in the solidified zinc layer to a content of Zn (g/m2) in the galvanized layer is 10 to 95%.Type: ApplicationFiled: March 9, 2021Publication date: March 9, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Hiroshi TAKEBAYASHI, Kojiro AKIBA, Akihiro SENGOKU
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Publication number: 20230041452Abstract: A hot stamped component, includes: a base material; and a Zn-based plating layer provided in contact with the base material as an upper layer of the base material and containing Zn and Ni. A region of the Zn-based plating layer on a base material side is a Fe—Zn solid solution containing Ni, and two or more twins exist in 10 crystal grains of the Fe—Zn solid solution containing Ni adjacent to an interface between the base material and the Zn-based plating layer.Type: ApplicationFiled: March 23, 2020Publication date: February 9, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Akihiro SENGOKU, Kojiro AKIBA, Satoshi KATO
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Publication number: 20230023145Abstract: A hot stamped component, includes: a base material; and a Zn-based plating layer provided in contact with the base material as a layer above the base material and containing Zn. A base material side of the Zn-based plating layer is a Fe—Zn solid solution, and two or more twins exist in 10 crystal grains of the Fe—Zn solid solution adjacent to an interface between the base material and the Zn-based plating layer.Type: ApplicationFiled: March 23, 2020Publication date: January 26, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Akihiro SENGOKU, Kojiro AKIBA, Toshiki NONAKA
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Patent number: 11338550Abstract: There is provided a hot-stamped body including: a steel base metal; and a metallic layer formed on a surface of the steel base metal, wherein the metallic layer includes: an interface layer that contains, in mass %, Al: 30.0 to 36.0%, has a thickness of 100 nm to 5 ?m, and is located in an interface between the metallic layer and the steel base metal; and a principal layer that includes coexisting MgZn2 phases and insular FeAl2 phases, is located on the interface layer, and has a thickness of 3 ?m to 40 ?m.Type: GrantFiled: March 20, 2018Date of Patent: May 24, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Kohei Tokuda, Takuya Mitsunobu, Akihiro Sengoku, Kenichiro Matsumura
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Patent number: 11285698Abstract: There is provided a hot-stamped body including: a steel base metal; and a metallic layer formed on a surface of the steel base metal, wherein the metallic layer includes: an interface layer that contains, in mass %, Al: 30.0 to 36.0%, has a thickness of 100 nm to 15 ?m, and is located in an interface between the metallic layer and the steel base metal; and a principal layer that includes coexisting Zn phases and insular FeAl2 phases, is located on the interface layer, and has a thickness of 1 ?m to 40 ?m. This hot-stamped body is excellent in fatigue properties, corrosion resistance, and chipping resistance.Type: GrantFiled: March 20, 2018Date of Patent: March 29, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Takuya Mitsunobu, Kohei Tokuda, Akihiro Sengoku, Kenichiro Matsumura
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Patent number: 11028276Abstract: Provided are a surface-treated metal sheet excellent in the adhesiveness to a coating treatment film and weldability and a coated member.Type: GrantFiled: March 30, 2016Date of Patent: June 8, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Yasuaki Kawamura, Koji Akioka, Akihiro Sengoku, Yoichiro Mori
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Patent number: 10987695Abstract: A hot-dip zinc-based plated steel sheet includes: a base steel sheet that is a metal substrate; a hot-dip zinc-based plating layer provided on the base steel sheet; and a surface treatment layer formed on at least one surface of the hot-dip zinc-based plating layer, in which the surface treatment layer contains more than or equal to 0.1 g/m2 and less than or equal to 1.2 g/m2 of granular oxide per one surface on a metal basis in which, in a temperature range of 900 to 1300 K, standard free energy of formation (?G0) of oxide is smaller than standard free energy of formation (?G0Zn) of zinc oxide and larger than standard free energy of formation (?G0Al) of aluminum oxide at an identical temperature, and the granular oxide has a particle size of more than or equal to 3 nm and less than or equal to 100 nm.Type: GrantFiled: March 31, 2016Date of Patent: April 27, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Koji Akioka, Yasuaki Kawamura, Akihiro Sengoku
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Publication number: 20210039355Abstract: There is provided a hot-stamped body including: a steel base metal; and a metallic layer formed on a surface of the steel base metal, wherein the metallic layer includes: an interface layer that contains, in mass %, Al: 30.0 to 36.0%, has a thickness of 100 nm to 15 ?m, and is located in an interface between the metallic layer and the steel base metal; and a principal layer that includes coexisting Zn phases and insular FeAl2 phases, is located on the interface layer, and has a thickness of 1 ?m to 40 ?m. This hot-stamped body is excellent in fatigue properties, corrosion resistance, and chipping resistance.Type: ApplicationFiled: March 20, 2018Publication date: February 11, 2021Applicant: Nippon Steel CorporationInventors: Takuya MITSUNOBU, Kohei TOKUDA, Akihiro SENGOKU, Kenichiro MATSUMURA
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Publication number: 20210039354Abstract: There is provided a hot-stamped body including: a steel base metal; and a metallic layer formed on a surface of the steel base metal, wherein the metallic layer includes: an interface layer that contains, in mass %, Al: 30.0 to 36.0%, has a thickness of 100 nm to 5 ?m, and is located in an interface between the metallic layer and the steel base metal; and a principal layer that includes coexisting MgZn2 phases and insular FeAl2 phases, is located on the interface layer, and has a thickness of 3 ?m to 40 ?m.Type: ApplicationFiled: March 20, 2018Publication date: February 11, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Kohei TOKUDA, Takuya MITSUNOBU, Akihiro SENGOKU, Kenichiro MATSUMURA
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Patent number: 10851465Abstract: [Object] To provide a zinc-based plated steel sheet excellent in coating film adhesiveness after hot pressing more conveniently. [Solution] A zinc-based plated steel sheet according to the present invention comprises: a zinc-based plated steel sheet that is a base metal; and a surface treatment layer formed on at least one surface of the zinc-based plated steel sheet, in which the surface treatment layer contains one or more oxides selected from titanium oxide, nickel oxide, and tin(IV) oxide each having a particle size of more than or equal to 2 nm and less than or equal to 500 nm, in a range of more than or equal to 0.2 g/m2 and less than or equal to 2 g/m2 per one surface.Type: GrantFiled: March 31, 2016Date of Patent: December 1, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Yasuaki Kawamura, Koji Akioka, Akihiro Sengoku
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Patent number: 10549506Abstract: [Object] To provide a hot-dip zinc-based plated steel sheet excellent in coating film adhesiveness after hot pressing more conveniently. [Solution] A hot-dip zinc-based plated steel sheet according to the present invention includes: a hot-dip zinc-based plated steel sheet that is a base metal; and a surface treatment layer formed on at least one surface of the hot-dip zinc-based plated steel sheet, in which the surface treatment layer contains one or more oxides selected from zirconia, lanthanum oxide, cerium oxide, and neodymium oxide each having a particle size of more than or equal to 5 nm and less than or equal to 500 nm, in a range of more than or equal to 0.2 g/m2 and less than or equal to 2 g/m2 per one surface.Type: GrantFiled: March 31, 2016Date of Patent: February 4, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Yasuaki Kawamura, Koji Akioka, Akihiro Sengoku
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Publication number: 20200032360Abstract: Provided is a hot stamped body which includes a base metal, and a plated layer formed on a surface of the base metal, wherein the plated layer includes an interface layer, an intermediate layer, and an oxide layer in order from a base metal side, the interface layer contains one or more kinds of Fe—Al alloy, a total area fraction of the Fe—Al alloy being 99% or more, the intermediate layer 22 contains one or more kinds of Fe—Al—Zn alloy, a total area fraction of the Fe—Al—Zn phase being 50% or more, an average composition of the intermediate layer contains, in mass %, Al: 30 to 50% and Zn: 15 to 30%, and an average film thickness of the oxide layer is 3.0 ?m or less, and Mg content in the oxide layer is 0.05 to 0.50 g/m2.Type: ApplicationFiled: March 31, 2017Publication date: January 30, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Akihiro SENGOKU, Hiroshi TAKEBAYASHI, Koji AKIOKA, Kenichiro MATSUMURA
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Publication number: 20200024708Abstract: Provided is a surface treated steel sheet which includes a base metal, and a plated layer formed on a surface of the base metal, wherein an average composition of the plated layer contains, in mass %, Mg: 0.5 to 2.0%, and [60.0?Zn+Al?98.0], [0.4?Zn/Al?1.5], and [Zn/Al×Mg?1.6] are satisfied.Type: ApplicationFiled: March 31, 2017Publication date: January 23, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Akihiro SENGOKU, Hiroshi TAKEBAYASHI
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Publication number: 20190160507Abstract: A hot stamped steel according to one embodiment of the present invention includes a base material and a plated layer, wherein the plated layer includes an interface layer, an intermediate layer, and an oxide layer in order from a base material side to a surface side; in which compositions and thicknesses of each layer are controlled.Type: ApplicationFiled: May 10, 2016Publication date: May 30, 2019Applicant: Nippon Steel & Sumitomo Metal CorporationInventors: Akihiro SENGOKU, Hiroshi TAKEBAYASHI, Koji AKIOKA
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Patent number: 9976196Abstract: Hot-stamped steel includes: a steel base metal including a tempered portion having hardness corresponding to 85% or less of the highest quenching hardness defined as a Vickers hardness at a depth position spaced away from a surface layer by ¼ times a sheet thickness in a case of performing water quenching after heating at a temperature equal to or higher than an Ac3 point and retention for 30 minutes; and a Zn coating layer formed on the tempered portion of the base metal. The Zn coating layer includes a solid-solution layer including a solid-solution phase containing Fe and Zn that is solid-soluted in Fe, and a lamella layer including solid-solution phase and a capital gamma phase. In the Zn coating layer, an area ratio of the lamella layer is 30 to 100% and an area ratio of the solid-solution layer is 0 to 70%.Type: GrantFiled: March 31, 2015Date of Patent: May 22, 2018Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Akihiro Sengoku, Hiroshi Takebayashi