Patents by Inventor Yutaka Neishi
Yutaka Neishi 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: 11952650Abstract: A steel wire which has an excellent fatigue limit when made into a spring is provided. A chemical composition of the steel wire according to the present embodiment consists of, in mass %, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, S: 0.020% or less, Cr 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, N: 0.0070% or less, Ca: 0 to 0.0050%, and Nb: 0 to 0.020%, with the balance being Fe and impurities. In the steel wire, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 pieces/?m2.Type: GrantFiled: October 15, 2020Date of Patent: April 9, 2024Assignees: NIPPON STEEL CORPORATION, NIPPON STEEL SG WIRE CO., LTD.Inventors: Shinya Teramoto, Yutaka Neishi, Michimasa Aono, Shuji Kozawa, Satoru Mineta, Tatsuro Ochi, Shoichi Suzuki
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Publication number: 20240077123Abstract: A valve spring includes a nitrided layer, and a core portion that is further inward than the nitrided layer. A chemical composition of the core portion consists of, in mass %, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, S: 0.020% or less, Cr: 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Ca: 0.0001 to 0.0050%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, and N: 0.0070% or less, with the balance being Fe and impurities. In the core portion, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 per ?m2, and in the core portion, a numerical proportion of Ca sulfides with respect to a total number of oxide-based inclusions and sulfide-based inclusions is 0.20% or less.Type: ApplicationFiled: October 15, 2020Publication date: March 7, 2024Inventors: Shinya TERAMOTO, Yutaka NEISHI, Michimasa AONO, Shuji KOZAWA, Fumio TAKAHASHI, Shigekazu NISHIMOTO, Mitsuhiro KONDO, Tatsuro OCHI, Shoichi SUZUKI
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Publication number: 20230392244Abstract: A steel wire which has an excellent fatigue limit when made into a spring is provided. A chemical composition of the steel wire according to the present embodiment consists of, in mass %, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, S: 0.020% or less, Cr 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, N: 0.0070% or less, Ca: 0 to 0.0050%, and Nb: 0 to 0.020%, with the balance being Fe and impurities. In the steel wire, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 pieces/?m2.Type: ApplicationFiled: October 15, 2020Publication date: December 7, 2023Inventors: Shinya TERAMOTO, Yutaka NEISHI, Michimasa AONO, Shuji KOZAWA, Satoru MINETA, Tatsuro OCHI, Shoichi SUZUKI
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Publication number: 20230296152Abstract: A damper spring having an excellent fatigue limit is provided. A damper spring according to the present embodiment includes a nitrided layer formed in an outer layer, and a core portion that is further inward than the nitrided layer. The chemical composition of the core portion consists of, in mass%, C: 0.53 to 0.59%, Si: 2.51 to 2.90%, Mn: 0.70 to 0.85%, P: 0.020% or less, 5: 0.020% or less, Cr: 1.40 to 1.70%, Mo: 0.17 to 0.53%, V: 0.23 to 0.33%, Cu: 0.050% or less, Ni: 0.050% or less, Al: 0.0050% or less, Ti: 0.050% or less, N: 0.0070% or less, and Nb: 0 to 0.020%, with the balance being Fe and impurities. In the core portion, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 500 to 8000 pieces/?m2.Type: ApplicationFiled: October 15, 2020Publication date: September 21, 2023Inventors: Shinya TERAMOTO, Yutaka NEISHI, Michimasa AONO, Shuji KOZAWA, Yoichi OI, Naoki TAKABAYASHI, Junji TANAKA, Fumio TAKAHASHI, Shigekazu NISHIMOTO, Mitsuhiro KONDO, Tatsuro OCHI, Shoichi SUZUKI
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Publication number: 20230151853Abstract: There is provided a carburized bearing that is excellent in rolling contact fatigue life with a change in structure under a hydrogen-generating environment. In the carburized bearing, a chemical composition of a core portion consists of, in mass %, C: 0.25 to 0.45%, Si: 0.10 to 0.50 %, Mn: 0.40 to 0.70 %, P: 0.015% or less, S: 0.005% or less, Cr: 0.80 to 1.50%, Mo: 0.17 to 0.30%, V: 0.24 to 0.40%. Al: 0.005 to 0.100%, N: 0.0300% or less, O: 0.0015% or less, and the balance being Fe and impurities, and satisfies Formula (1) to Formula (4) described in the present specification. A proportion of a total area of CaO—CaS—MgO—Al2O3 composite oxides with respect to a total area of oxides in the carburized leaping is 30.0% or more, and a number density of oxides having an equivalent circle diameter of 20.0 ?m or more is 15.0 pieces/mm2or less.Type: ApplicationFiled: March 31, 2021Publication date: May 18, 2023Inventors: Yutaka NEISHI, Keisuke CHIBA, Kohei KANETANI, Takashi SADA
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Publication number: 20230118113Abstract: A steel consists of, in mass %, C: 0.25 to 0.45%, Si: 0.10 to 0.50%, Mn: 0.40 to 0.70%, P: 0.015% or less, S: 0.005% or less, Cr: 0.80 to 1.50%, Mo: 0.17 to 0.30%, V: 0.24 to 0.40%, Al: 0.005 to 0.100%, N: 0.0300% or less, O: 0.0015% or less, and the balance being Fe and impurities, and satisfies Formula (1) to Formula (4) described in the present specification, wherein: its microstructure is composed of ferrite and pearlite having a total area fraction of 5.0 to 100.0%, and a hard phase having a total area fraction of 0 to 95.0%; a proportion of a total area of CaO—CaS—MgO—Al2O3 composite oxides with respect to a total area of oxides in the steel is 30.0% or more; and a number density of oxides having an equivalent circle diameter of 20.0 ?m or more is 15.0 pieces/mm2 or less.Type: ApplicationFiled: March 31, 2021Publication date: April 20, 2023Inventors: Yutaka NEISHI, Keisuke CHIBA, Kohei KANETANI, Takashi SADA
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Publication number: 20230087453Abstract: A valve spring which has an excellent fatigue limit is provided. A chemical composition of the valve spring according to the present embodiment contains, in mass %, C: 0.50 to 0.80%, Si: 1.20 to less than 2.50%, Mn: 0.25 to 1.00%, P: 0.020% or less. S: 0.020% or less: Cr: 0.40 to 1.90%, V: 0.05 to 0.60%, Ca: 0.0001 to 0.0050%, and N: 0.0100% or less, with the balance being Fe and impurities. In the valve spring, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 5000 to 80000 pieces/?m3, and a numerical proportion of Ca sulfides with respect to a total number of oxide-based inclusions and sulfide-based inclusions is 0.20% or less.Type: ApplicationFiled: February 19, 2021Publication date: March 23, 2023Inventors: Shinya TERAMOTO, Yutaka NEISHI, Michimasa AONO, Satoru MINETA, Shoichi SUZUKI, Tatsuro OCHI
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Publication number: 20230081462Abstract: A damper spring which has an excellent fatigue limit is provided. A chemical composition of the damper spring according to the present embodiment contains in mass %, C: 0.50 to 0.80%, Si: 1.20 to less than 2.50%, Mn: 0.25 to 1.00%, P: 0.020% or less, S: 0.020% or less, Cr: 0.40 to 1.90%, V: 0.05 to 0.60%, and N: 0.0100% or less, with the balance being Fe and impurities. In the damper spring, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 5000 to 80000 pieces/m3.Type: ApplicationFiled: February 19, 2021Publication date: March 16, 2023Inventors: Shinya TERAMOTO, Yutaka NEISHI, Michimasa AONO, Shoichi SUZUKI, Tatsuro OCHI
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Publication number: 20230085279Abstract: A steel wire which has excellent cold coiling workability, and which has an excellent fatigue limit when made into a spring is provided. A chemical composition of the steel wire according to the present, embodiment containing, in mass %, C: 0.50 to 0.80%, Si: 1.20 to less than 2.50%, Mn: 0.25 to 1.00%, P: 0.020% or less, S: 0.020% or less, Cr: 0.40 to 1.90%, V: 0.05 to 0.60%, and N: 0.0100% or less, with the balance being Fe and impurities. In the steel wire, a number density of V-based precipitates having a maximum diameter ranging from 2 to 10 nm is 5000 to 80000 pieces/?m3.Type: ApplicationFiled: February 19, 2021Publication date: March 16, 2023Inventors: Shinya TERAMOTO, Yutaka NEISHI, Michimasa AONO, Satoru MINETA, Shoichi SUZUKI, Tatsuro OCHI
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Patent number: 11459630Abstract: A bearing steel part having a predetermined chemical composition, in which the number density of oxide particles having an equivalent circle diameter of 5 ?m or more, and containing CaO, Al2O3 and SiO2, such that the content ratio of Al2O3 with respect to the total mass of CaO, Al2O3, and SiO2 is 50% by mass or more, is 3.0/cm2 or less in an arbitrary cross section of the part, and in which the Vickers hardness at a depth of 50 ?m from a rolling surface is 750 or more, and in which the compressive residual stress at the rolling surface is 900 MPa or more. Also provided is a steel bar for a bearing steel part that is suitable for obtaining the foregoing bearing steel part.Type: GrantFiled: January 22, 2019Date of Patent: October 4, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Tatsuya Koyama, Kei Miyanishi, Yutaka Neishi
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Patent number: 11390936Abstract: There is provided a spring steel including predetermined chemical composition, in which ([Ti mass %]?3.43×[N mass %])/[S mass %]>4.0, and [Ni mass %]+[Cu mass %]<0.75 are satisfied, and an appearance frequency of MnS is less than 20% among inclusions having an equivalent circle diameter of 1 ?m or more which are observed at a ¼ position of a diameter from a surface.Type: GrantFiled: January 26, 2017Date of Patent: July 19, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Takahisa Suzuki, Suguru Yoshida, Yutaka Neishi
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Patent number: 11326643Abstract: A rolling sliding member includes a base part and a surface layer. The base part has a composition that includes 0.30 mass % to 0.45 mass % of carbon, 0.15 mass % to 0.45 mass % of silicon, 0.40 to 1.50 mass % of manganese, 0.60 mass % to 2.00 mass % of chromium, 0.10 mass % to 0.35 mass % of molybdenum, 0.20 mass % to 0.40 mass % of vanadium, and 0.005 mass % to 0.100 mass % of aluminum, and a remainder of iron and inevitable impurities. The surface layer is positioned around the base part. The surface layer has a Vickers hardness of 700 to 800 and a retained austenite content of 25 volume % to 50 volume %. The thickness of a grain boundary oxide layer satisfies Formula: thickness of grain boundary oxide layer?equivalent diameter of rolling sliding member×1.4×10?3.Type: GrantFiled: August 20, 2018Date of Patent: May 10, 2022Assignees: JTEKT CORPORATION, NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Kohei Kanetani, Takashi Sada, Tomohiro Yamashita, Takahisa Suzuki, Yutaka Neishi, Daisuke Hirakami
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Publication number: 20220106671Abstract: There is provided a steel material that has a high critical working ratio in cold forging and has a high fatigue strength and an excellent hydrogen embrittlement resistance when the steel material is formed into a carburized-steel component. The steel material according to the present embodiment has a chemical composition that contains, in mass %, C: 0.07 to 0.13%, Si: 0.15 to 0.35%, Mn: 0.60 to 0.80%, S: 0.005 to 0.050%, Cr: 1.90 to 2.50%, B: 0.0005 to 0.0100%, Ti: 0.010 to less than 0.050%, Al: 0.010 to 0.100%, Ca: 0.0002% to 0.0030%, N: 0.0080% or less, P: 0.050% or less, and O: 0.0030% or less, with the balance being Fe and impurities, and satisfies Formula (1) to Formula (5) described in the specification.Type: ApplicationFiled: December 27, 2019Publication date: April 7, 2022Inventors: Akira SHIGA, Yutaka NEISHI
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Publication number: 20220074032Abstract: The steel material includes a chemical composition containing, in mass %, C: 0.15 to 0.45%, Si: 0.50% or less, Mn: 0.20 to 0.60%, P: 0.015% or less, S: 0.005% or less, Cr: 0.80 to 1.50%, Mo: 0.17 to 0.30%, V: 0.24 to 0.40%, Al: 0.005 to 0.100%, N: 0.0300% or less, O: 0.0015% or less, and the balance being Fe and impurities, and satisfying Formula (1) to Formula (4) described in Embodiment, wherein, in its microstructure, a total area fraction of ferrite and pearlite is 10.0% or more, and a proportion of a content of V (mass %) in electrolytic extraction residue to the content of V (mass %) in the chemical composition is 10.0% or less.Type: ApplicationFiled: December 27, 2019Publication date: March 10, 2022Inventors: Yutaka NEISHI, Tomohiro YAMASHITA, Daisuke HIRAKAMI, Takahisa SUZUKI, Tatsuya KOYAMA, Takashi SADA, Kohei KANETANI
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Publication number: 20220042545Abstract: A core portion of the carbonitrided bearing component includes a chemical composition consisting of, in mass %, C: 0.15 to 0.45%, Si: 0.50% or less, Mn: 0.20 to 0.60%, P: 0.015% or less, S: 0.005% or less, Cr 0.80 to 1.50%, Mo: 0.17 to 0.30%, V: 0.24 to 0.40%, Al: 0.005 to 0.100%, N: 0.0300% or less, O: 0.0015% or less, and the balance being Fe and impurities, and satisfying Formula (1) to Formula (4) described in the embodiment of the present specification. A concentration of C of its surface is, in mass %, 0.70 to 1.20%, a concentration of N of the surface is, in mass %, 0.15 to 0.60%, a Rockwell C-scale hardness HRC of the surface is 58 to 65, and in the core portion, an area ratio of an area of coarse V-based precipitates to a total area of V-based precipitates is 15.0% or less.Type: ApplicationFiled: December 27, 2019Publication date: February 10, 2022Inventors: Yutaka NEISHI, Tomohiro YAMASHITA, Daisuke HIRAKAMI, Takahisa SUZUKI, Tatsuya KOYAMA, Takashi SADA, Kohei KANETANI
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Publication number: 20220025493Abstract: Provided is a steel material which can achieve excellent fatigue strength even when a carburized steel component is produced by welding before carburizing treatment. The steel material has a chemical composition containing: in mass %, C: 0.09 to 0.16%, Si: 0.01 to 0.50%, Mn: 0.40 to 0.60%, P: 0.030% or less, S: 0.025% or less, Cr: 0.90 to 2.00%, Mo: 0.10 to 0.40%, Al: 0.005 to 0.030%, Ti: 0.010 to less than 0.050%, Nb: 0.010 to 0.030%, N: 0.0080% or less, O: 0.0030% or less, B: 0.0003 to 0.0030%, Ca: 0.0005 to 0.0050%, and the balance: Fe and impurities, and satisfying Formula (1) to Formula (3) according to the description. In a cross section parallel to an axial direction of the steel material, an amount of Mn sulfide is 70.0 pieces/mm2 or less, and an amount of oxide is 25.0 pieces/mm2 or less.Type: ApplicationFiled: January 9, 2020Publication date: January 27, 2022Inventors: Yutaka NEISHI, Takafumi AMATA
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Publication number: 20220025475Abstract: A ripper shank as the impact and wear resistant component is made of a steel of a specific component composition which has a hardness of HRC 53 or more and HRC 57 or less. The steel includes a matrix including a martensite phase and a residual austenite phase, and first nonmetallic particles dispersed in the matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN. The steel does not include a M23C6 carbide.Type: ApplicationFiled: December 26, 2019Publication date: January 27, 2022Applicants: KOMATSU LTD., NIPPON STEEL CORPORATIONInventors: Eiji AMADA, Kouji KITAMURA, Kazuo MAEDA, Naomi KOBAYASHI, Takashi NODA, Mamoru HATANO, Takafumi AMATA, Yutaka NEISHI, Kei MIYANISHI, Ryoji NISHIJIMA, Daisuke TAKIGUCHI
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Patent number: 11168387Abstract: The steel material for a carburized bearing part according to the present invention contains, by mass %, C: 0.25 to 0.45%, Si: 0.15 to 0.45%, Mn: 0.40 to 1.50%, P: 0.015% or less, S: 0.005% or less, Cr: 0.60 to 2.00%, Mo: 0.10 to 0.35%, V: 0.20 to 0.40%, Al: 0.005 to 0.100%, Ca: 0.0002 to 0.0010%, N: 0.0300% or less and O: 0.0015% or less, with the balance being Fe and impurities, and satisfies Formulae (1) to (3). 1.20<0.4Cr+0.4Mo+4.5V<2.75??(1) A1/A2>0.50??(2) 2.7C+0.4Si+Mn+0.45Ni+0.8Cr+Mo+V>2.55??(3) Formula (2) shows an area fraction of sulfides containing Ca in an amount of 1 mol % or more among sulfides having an equivalent circular diameter of 1 ?m or more.Type: GrantFiled: August 24, 2018Date of Patent: November 9, 2021Assignees: Nippon Steel Corporation, JTEKT CorporationInventors: Tomohiro Yamashita, Takahisa Suzuki, Yutaka Neishi, Daisuke Hirakami, Kohei Kanetani, Takashi Sada
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Patent number: 11162454Abstract: An upper member of a steel piston has a chemical composition which consists of, in mass %, C: 0.15 to 0.30%, Si: 0.02 to 1.00%, Mn: 0.20 to 0.80%, P: 0.020% or less, S: 0.028% or less, Cr: 0.80 to 1.50%, Mo: 0.08 to 0.40%, V: 0.10 to 0.40%, Al: 0.005 to 0.060%, N: 0.0150% or less, O: 0.0030% or less, and the balance: Fe and impurities, and satisfies Formula (1) and Formula (2), in which, at a cross section parallel to the axial direction of the upper member, the number of Mn sulfides is 100.0 per mm2 or less, the number of coarse Mn sulfides having an equivalent circular diameter of 3.0 ?m or more is within a range of 1.0 to 10.0 per mm2, and the number of oxides is 15.0 per mm2 or less. 0.42?Mo+3V?1.50??(1) V/Mo?0.Type: GrantFiled: May 31, 2019Date of Patent: November 2, 2021Assignees: NIPPON STEEL CORPORATION, ISUZU MOTORS LIMITEDInventors: Yutaka Neishi, Yorimasa Tsubota, Kouji Oosato, Hirohito Eto, Wataru Nagai, Yoshitomi Yamada
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Publication number: 20210316801Abstract: A track link which is a tracked undercarriage component is made of a steel having a specific component composition, and includes a high hardness portion having a hardness of HRC 57 or more and HRC 60 or less, and a low hardness portion. The high hardness portion includes a first matrix including a martensite phase and a residual austenite phase, and first nonmetallic particles dispersed in the first matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a M23C6 carbide. The low hardness portion includes a second matrix including a martensite phase, and second nonmetallic particles dispersed in the second matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a M23C6 carbide.Type: ApplicationFiled: August 22, 2019Publication date: October 14, 2021Applicants: KOMATSU LTD., NIPPON STEEL CORPORATIONInventors: Eiji AMADA, Kazuo MAEDA, Naomi KOBAYASHI, Takashi NODA, Mamoru HATANO, Takafumi AMATA, Yutaka NEISHI, Kei MIYANISHI, Ryoji NISHIJIMA