Patents by Inventor Katsuki TANAKA

Katsuki TANAKA 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).

  • Publication number: 20240318289
    Abstract: Provided is a heat-resistant ferritic steel having a chemical composition containing, by mass %, C: 0.07 to 0.14%, Si: 0.15 to 0.35%, Mn: 0.30 to 0.55%, P: 0.0250% or less, S: 0.0030% or less, Ni: 0.15 to 0.35%, Cr: 8.0 to 9.7%, Mo: 0.20 to 0.60%, W: 1.50 to 2.30%, V: 0.16 to 0.25%, Nb: 0.020 to 0.120%, B: 0.0010 to 0.0050%, N: 0.010 to 0.080%, Al: 0.020% or less, and O: 0.020% or less, with the balance Fe and impurities, wherein VER, i.e., the V content (mass %) in precipitates obtained by extracted residue analysis satisfies [?0.2×C+0.060?VER??0.1×C+0.160].
    Type: Application
    Filed: July 14, 2021
    Publication date: September 26, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki HIRATA, Katsuki TANAKA, Masayuki TAKIGUCHI, Mitsuru YOSHIZAWA, Junichi HIGUCHI, Takahiro OSUKI
  • Publication number: 20240254609
    Abstract: There is provided an austenitic stainless steel having a chemical composition that comprises, in mass %: C: 0.002 to 0.020%, Si: 0.10 to 0.60%, Mn: 0.2 to 2.0%, P: 0.035% or less, S: 0.010% or less, Cu: 2.50 to 4.50%, Ni: 9.00 to 16.00%, Cr: 15.00 to 20.00%, Mo: 0.20 to 1.50%, Nb: 0.15 to 0.60%, N: 0.05 to 0.15%, B: 0.0010 to 0.0060%, and optional elements, with the balance: Fe and impurities and that satisfies [0.010?VER+TiER+NbER], [27.0?1.13 (Ni—NiER)+(Cr—CrER)+1.85 (Mo—MoER)+1.79(Nb—NbER)<40.5], and [NbER<0.052].
    Type: Application
    Filed: May 26, 2022
    Publication date: August 1, 2024
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masahiro SETO, Takumi NISHIMOTO, Katsuki TANAKA
  • Publication number: 20240240295
    Abstract: A composite tube is provided that includes a first tube and a second tube. A chemical composition of the first tube includes, in mass %, C: more than 0.060% to 0.400% or less, Si: 0.01 to 1.00%, Mn: 0.01 to 1.20%, P: 0.0350% or less, S: 0.0150% or less, Sn: 0.0005 to 0.0400%, Al: 0.040% or less, N: 0.050% or less, O: 0.030% or less, and the balance: Fe and impurities. A chemical composition of the second tube includes, in mass %, C: 0.003 to 0.100%, Si: 0.01 to 1.50%, Mn: 0.01 to 2.20%, P: 0.0400% or less, S: 0.0100% or less, Sn: 0.0005 to 0.0300%, Ni: 7.0 to 52.0%, Cr: 15.0 to 27.0%, Al: 0.001 to 0.600%, N: 0.001 to 0.150%, O: 0.030% or less, and the balance: Fe and impurities. The composite tube satisfies formulas [Siave+6×Pave+20×Save+2×Snave?1.1000] and [0.0015?4×Save+Snave].
    Type: Application
    Filed: August 6, 2021
    Publication date: July 18, 2024
    Inventors: Hiroyuki HIRATA, Mitsuru YOSHIZAWA, Katsuki TANAKA, Takahiro OSUKI
  • Patent number: 11834731
    Abstract: A method of producing a ferritic heat-resistant steel welded joint, the method including: a multi-layer welding step in which a ferritic heat-resistant steel base material including B at 0.006% by mass to 0.023% by mass is multi-layer welded using a Ni-based welding material for heat-resistant alloy, wherein root pass welding is performed under a welding condition such that a ratio of an area [SBM] that has been melted of the ferritic heat-resistant steel base material to an area [SWM] of a weld metal, in a transverse cross-section of a weldment after the root pass welding but before second pass welding in the multi-layer welding step, satisfies the following formula (1): 0.1?[SBM]/[SWM]??50×[% BBM]+1.3, with respect to a mass percent of B, [% BBM], which is included in the ferritic heat-resistant steel base material.
    Type: Grant
    Filed: December 5, 2019
    Date of Patent: December 5, 2023
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki Hirata, Kana Jotoku, Shinnosuke Kurihara, Katsuki Tanaka
  • Publication number: 20230182644
    Abstract: Provided is a structure that makes it possible to reduce the number of components. The present invention provides a structure including a resin-molded body and a torsion spring. The resin-molded body includes a front wall and a rear wall spaced apart from each other and a peripheral wall connecting peripheries of the front wall and the rear wall. The resin-molded body includes first and second plate-shaped portions and a hinge portion. The first and second plate-shaped portions are rotatably coupled to each other with the hinge portion. The hinge portion is formed by making the rear wall concave toward the front wall to form a hinge concave portion and welding the rear wall to the front wall. The torsion spring includes first and second arms and a coil portion provided therebetween. The first arm is slidably supported by the first plate-shaped portion. The second arm is supported by the second plate-shaped portion.
    Type: Application
    Filed: April 21, 2021
    Publication date: June 15, 2023
    Applicants: KYORAKU CO., LTD., HAYASHI TELEMPU CORPORATION
    Inventors: Masaaki SUEOKA, Ryuichi ISHIDA, Takashi IMADA, Katsuki TANAKA, Kenta SUZUKI
  • Publication number: 20220325394
    Abstract: An austenitic heat resisting steel includes, as a chemical composition, by mass %: C: 0.04% to 0.12%; Si: 0.10% to 0.30%; Mn: 0.20% to 0.80%; P: 0% to 0.030%; S: 0.0001% to 0.0020%: Sn: 0.0005% to 0.0230%; Cu: 2.3% to 3.8%; Co: 0.90% to 2.40%; Ni: 22.0% to 28.0%; Cr: 20.0% to 25.0%; Mo: 0.01% to 0.40%; W: 2.8% to 4.2%; Nb: 0.20% to 0.80%; B: 0.0010% to 0.0050%; and N: 0.16% to 0.30%, and a remainder of Fe and impurities, optionally further includes one or more selected from Al, O, V, Ti, Ta, C, Mg, and REM, in which 0.0012%?[% S]+[% Sn]?2.5×[% B]+0.0125% is satisfied.
    Type: Application
    Filed: July 30, 2020
    Publication date: October 13, 2022
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki HIRATA, Mitsuru YOSHIZAWA, Junichi HIGUCHI, Katsuki TANAKA
  • Publication number: 20220235445
    Abstract: A ferritic heat-resistant steel includes, by mass: from 0.06 to 0.11% of C; from 0.15 to 0.35% of Si; from 0.35 to 0.65% of Mn; from 0 to 0.02% of P; from 0 to 0.003% of S; from 0.005 to 0.25% of Ni; from 0.005 to 0.25% of Cu; from 2.7 to 3.3% of Co; from 8.3 to 9.7% of Cr; from 2.5 to 3.5% of W; from 0.15 to 0.25% of V; from 0.03 to 0.08% of Nb; from 0.002 to 0.04% of Ta; from 0.01 to 0.06% of Nd; from 0.006 to 0.016% of B; from 0.005 to 0.015% of N; from 0 to 0.02% of Al; and from 0 to 0.02% of O, with a balance consisting of Fe and impurities, and an amount of W, which is analyzed as an electrolytically extracted residue, [% W]ER, satisfying: ?10×[% B]+0.26?[% W]ER?10×[% B]+0.54.
    Type: Application
    Filed: March 19, 2020
    Publication date: July 28, 2022
    Inventors: Hiroyuki HIRATA, Mitsuru YOSHIZAWA, Junichi HIGUCHI, Katsuki TANAKA
  • Patent number: 11339461
    Abstract: A austenitic stainless steel which has a chemical composition consisting of, by mass %, C: 0.04 to 0.12%, Si: 0.25 to 0.55%, Mn: 0.7 to 2.0%, P: 0.035% or less, S: 0.0015% or less, Cu: 0.02 to 0.80%, Co: 0.02 to 0.80%, Ni: 10.0 to 14.0%, Cr: 15.5 to 17.5%, Mo: 1.5 to 2.5%, N: 0.01 to 0.10%, Al: 0.030% or less, O: 0.020% or less, Sn: 0 to 0.01%, Sb: 0 to 0.01%, As: 0 to 0.01%, Bi: 0 to 0.01%, V: 0 to 0.10%, Nb: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [18.0?Cr+Mo+1.5×Si?20.0] and [14.5?Ni+30×(C+N)+0.5×(Mn+Cu+Co)?19.5].
    Type: Grant
    Filed: October 3, 2018
    Date of Patent: May 24, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki Hirata, Katsuki Tanaka, Kana Jotoku
  • Patent number: 11339462
    Abstract: A austenitic stainless steel weld metal which has a chemical composition consisting of, by mass %, C: 0.01 to 0.10%, Si: 0.20 to 0.70%, Mn: 0.8 to 2.5%, P: 0.035% or less, S: 0.0030% or less, Cu: 0.01 to 0.60%, Co: 0.01 to 1.00%, Ni: 8.0 to 12.0%, Cr: 14.5 to 17.5%, Mo: 1.0 to 2.2%, N: 0.02 to 0.10%, Al: 0.030% or less, O: 0.020% or less, Sn: 0 to 0.01%, Sb: 0 to 0.01%, As: 0 to 0.01%, Bi: 0 to 0.01%, V: 0 to 0.10%, Nb: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [17.5?Cr+Mo+1.5×Si?19.5] and [11.0?Ni+30×(C+N)+0.5×(Mn+Cu+Co)?17.0].
    Type: Grant
    Filed: October 3, 2018
    Date of Patent: May 24, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki Hirata, Katsuki Tanaka, Kana Jotoku
  • Publication number: 20220042150
    Abstract: A method of producing a ferritic heat-resistant steel welded joint, the method including: a multi-layer welding step in which a ferritic heat-resistant steel base material including B at 0.006% by mass to 0.023% by mass is multi-layer welded using a Ni-based welding material for heat-resistant alloy, wherein root pass welding is performed under a welding condition such that a ratio of an area [SBM] that has been melted of the ferritic heat-resistant steel base material to an area [SWM] of a weld metal, in a transverse cross-section of a weldment after the root pass welding but before second pass welding in the multi-layer welding step, satisfies the following formula (1): 0.1?[SBM]/[SWM]??50×[% BBM]+1.3, with respect to a mass percent of B, [% BBM], which is included in the ferritic heat-resistant steel base material.
    Type: Application
    Filed: December 5, 2019
    Publication date: February 10, 2022
    Inventors: Hiroyuki HIRATA, Kana JOTOKU, Shinnosuke KURIHARA, Katsuki TANAKA
  • Publication number: 20210292876
    Abstract: There is provided an austenitic heat resistant alloy including a chemical composition that contains, in mass percent: C: 0.04 to 0.18%, Si: 1.5% or less; Mn: 2.0% or less, P: 0.020% or less, S: 0.030% or less, Cu: 0.10% or less, Ni: 20.0 to 30.0%, Cr: 21.0 to 24.0%, Mo: 1.0 to 2.0%, Nb: 0.10 to 0.40%, Ti: 0.20% or less, Al: 0.05% or less, N: 0.10 to 0.35%, and B: 0.0015 to 0.005%, with the balance: Fe and impurities, the austenitic heat resistant alloy satisfying [P+6B?0.040].
    Type: Application
    Filed: October 3, 2017
    Publication date: September 23, 2021
    Inventors: Shinnosuke Kurihara, Hiroyuki Semba, Hirokazu Okada, Junichi Higuchi, Katsuki Tanaka, Takahiro Osuki
  • Patent number: 11090755
    Abstract: The present invention provides a welding material for ferritic heat-resistant steel, a welded joint for ferritic heat-resistant steel, and a method for producing the welded joint for to form a weld metal having a high creep strength and a high toughness in welding a ferritic heat-resistant steel that contains B. The welding material for ferritic heat-resistant steel has a chemical composition containing, in mass %, C: 0.06 to 0.10%, Si: 0.1 to 0.4%, Mn: 0.3 to 0.7%, Co: 2.6 to 3.4%, Ni: 0.01 to 1.10%, Cr: 8.5 to 9.5%, W: 2.5 to 3.5%, Nb: 0.02 to 0.08%, V: 0.1 to 0.3%, Ta: 0.02 to 0.08%, B: 0.007 to 0.015%, N: 0.005 to 0.020%, with the balance being Fe and impurities, and satisfying Formula (1): 0.5?Cr+6Si+1.5W+11V+5Nb+10B?40C?30N?4Ni?2Co?2Mn?10.0??(1).
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: August 17, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki Hirata, Kana Jotoku, Tomoaki Hamaguchi, Toshihide Ono, Katsuki Tanaka
  • Patent number: 11021778
    Abstract: An austenitic stainless steel weld metal which has a chemical composition consisting of, by mass %, C: 0.05 to 0.11%, Si: 0.10 to 0.50%, Mn: 1.0 to 2.5%, P: 0.035% or less, S: 0.0030% or less, Co: 0.01 to 1.00%, Ni: 9.0 to 11.5%, Cr: 17.0 to 21.0%, Nb: 0.60 to 0.90%, Ta: 0.001 to 0.100%, N: 0.01 to 0.15%, Al: 0.030% or less, O: 0.020% or less, V: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, Mo: 0 to 0.50%, Cu: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [Nb?7.8×C?0.25].
    Type: Grant
    Filed: October 3, 2018
    Date of Patent: June 1, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki Hirata, Kana Jotoku, Katsuki Tanaka
  • Publication number: 20200318225
    Abstract: A austenitic stainless steel which has a chemical composition consisting of, by mass %, C: 0.04 to 0.12%, Si: 0.25 to 0.55%, Mn: 0.7 to 2.0%, P: 0.035% or less, S: 0.0015% or less, Cu: 0.02 to 0.80%, Co: 0.02 to 0.80%, Ni: 10.0 to 14.0%, Cr: 15.5 to 17.5%, Mo: 1.5 to 2.5%, N: 0.01 to 0.10%, Al: 0.030% or less, O: 0.020% or less, Sn: 0 to 0.01%, Sb: 0 to 0.01%, As: 0 to 0.01%, Bi: 0 to 0.01%, V: 0 to 0.10%, Nb: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [18.0?Cr+Mo+1.5×Si?20.0] and [14.5?Ni+30×(C+N)+0.5×(Mn+Cu+Co)?19.5].
    Type: Application
    Filed: October 3, 2018
    Publication date: October 8, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki HIRATA, Katsuki TANAKA, Kana JOTOKU
  • Publication number: 20200283878
    Abstract: A austenitic stainless steel weld metal which has a chemical composition consisting of, by mass %, C: 0.01 to 0.10%, Si: 0.20 to 0.70%, Mn: 0.8 to 2.5%, P: 0.035% or less, S: 0.0030% or less, Cu: 0.01 to 0.60%, Co: 0.01 to 1.00%, Ni: 8.0 to 12.0%, Cr: 14.5 to 17.5%, Mo: 1.0 to 2.2%, N: 0.02 to 0.10%, Al: 0.030% or less, O: 0.020% or less, Sn: 0 to 0.01%, Sb: 0 to 0.01%, As: 0 to 0.01%, Bi: 0 to 0.01%, V: 0 to 0.10%, Nb: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [17.5?Cr+Mo+1.5×Si?19.5] and [11.0?Ni+30×(C+N)+0.5×(Mn+Cu+Co)?17.0].
    Type: Application
    Filed: October 3, 2018
    Publication date: September 10, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki HIRATA, Katsuki TANAKA, Kana JOTOKU
  • Publication number: 20200238444
    Abstract: A welding material for austenitic heat resistant steel is provided that has a chemical composition which consists of, by mass %, C: 0.06 to 0.14%, Si: 0.10 to 0.40%, Mn: 2.0 to 4.0%, P: 0.020% or less, Cu: 2.0 to 4.0%, Ni: 15.0 to 19.0%, Cr: 16.0 to 20.0%, Mo: 0.50 to 1.50%, Nb: 0.30 to 0.60%, N: 0.10 to 0.30%, Al: 0.030% or less, O: 0.020% or less, S: 0 to 0.0030%, Sn: 0 to 0.0030%, Bi: 0 to 0.0030%, Zn: 0 to 0.0030%, Sb: 0 to 0.0030%, As: 0 to 0.0030%, V: 0 to 0.50%, Ti: 0 to 0.50%, Ta: 0 to 0.50%, Co: 0 to 2.0%, B: 0 to 0.020%, Ca: 0 to 0.020%, Mg: 0 to 0.020%, REM: 0 to 0.06%, with the balance being Fe and impurities, and which contains two or more types of element selected from S, Sn, Bi, Zn, Sb and As within a range that satisfies [0.0005?S+Sn+Bi+Zn+Sb+As?0.0030].
    Type: Application
    Filed: October 3, 2018
    Publication date: July 30, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki HIRATA, Kana JOTOKU, Shinnosuke KURIHARA, Katsuki TANAKA
  • Publication number: 20200239986
    Abstract: An austenitic stainless steel weld metal which has a chemical composition consisting of, by mass %, C: 0.05 to 0.11%, Si: 0.10 to 0.50%, Mn: 1.0 to 2.5%, P: 0.035% or less, S: 0.0030% or less, Co: 0.01 to 1.00%, Ni: 9.0 to 11.5%, Cr: 17.0 to 21.0%, Nb: 0.60 to 0.90%, Ta: 0.001 to 0.100%, N: 0.01 to 0.15%, Al: 0.030% or less, O: 0.020% or less, V: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, Mo: 0 to 0.50%, Cu: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [Nb-7.8×C?0.25].
    Type: Application
    Filed: October 3, 2018
    Publication date: July 30, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki HIRATA, Kana JOTOKU, Katsuki TANAKA
  • Patent number: 10519533
    Abstract: A high Cr austenitic stainless steel with a chemical composition consisting of in terms of % by mass, 0.03 to 0.12% of C, 0.10 to 1.00% of Si, 0.10 to 3.00% of Mn, 0.030% or less of P, 0.020% or less of S, 21.50 to 28.00% of Cr, more than 26.00 and not more than 35.00% of Ni, more than 2.00 and not more than 5.00% of W, 0.80% or less of Co, 0.01 to 0.70% of V, 0.15 to 1.00% of Nb, 0.001 to 0.040% of Al, 0.0001 to 0.0100% of B, 0.010 to 0.400% of N, 0.001 to 0.200% of Zr, 0.001 to 0.200% of Nd, 0.001 to 0.200% of Ta, 0.020 to 0.200% of Ta+0.8Nd+0.5Zr, 0.025% or less of Ti+Sn+Sb+Pb+As+Bi, 0.0090% or less of O, and a remainder consisting of Fe and impurities.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: December 31, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Atsuro Iseda, Hiroyuki Semba, Hirokazu Okada, Hiroyuki Hirata, Toshihide Ono, Katsuki Tanaka, Tomoaki Hamaguchi, Kana Jotoku
  • Publication number: 20180354059
    Abstract: The present invention provides a welding material for ferritic heat-resistant steel, a welded joint for ferritic heat-resistant steel, and a method for producing the welded joint for to form a weld metal having a high creep strength and a high toughness in welding a ferritic heat-resistant steel that contains B. The welding material for ferritic heat-resistant steel has a chemical composition containing, in mass %, C: 0.06 to 0.10%, Si: 0.1 to 0.4%, Mn: 0.3 to 0.7%, Co: 2.6 to 3.4%, Ni: 0.01 to 1.10%, Cr: 8.5 to 9.5%, W: 2.5 to 3.5%, Nb: 0.02 to 0.08%, V: 0.1 to 0.3%, Ta: 0.02 to 0.08%, B: 0.007 to 0.015%, N: 0.005 to 0.020%, with the balance being Fe and impurities, and satisfying Formula (1): 0.5?Cr+6Si+1.5W+11V+5Nb+10B?40C?30N?4Ni?2Co?2Mn?10.
    Type: Application
    Filed: December 16, 2016
    Publication date: December 13, 2018
    Inventors: Hiroyuki HIRATA, Kana JOTOKU, Tomoaki HAMAGUCHI, Toshihide ONO, Katsuki TANAKA
  • Publication number: 20180216215
    Abstract: An austenitic heat-resistant alloy has a chemical composition of, in mass %: 0.04 to 0.14% C; 0.05 to 1% Si; 0.5 to 2.5% Mn; up to 0.03% P; less than 0.001% S; 23 to 32% Ni; 20 to 25% Cr 1 to 5% W; 0.1 to 0.6% Nb; 0.1 to 0.6% V; 0.1 to 0.3% N; 0.0005 to 0.01% B; 0.001 to 0.02% Sn; up to 0.03% AI; up to 0.02% 0; 0 to 0.5% Ti; 0 to 2% Co; 0 to 4% Cu; 0 to 4% Mo; 0 to 0.02% Ca; 0 to 0.02% Mg; 0 to 0.2% REM; and the balance being Fe and impurities. The alloy microstructure has a grain size number in accordance with ASTM E112 of 2.0 or more and less than 7.0.
    Type: Application
    Filed: June 2, 2016
    Publication date: August 2, 2018
    Inventors: Hiroyuki HIRATA, Hiroyuki SEMBA, Kana JOTOKU, Atsuro ISEDA, Toshihide ONO, Katsuki TANAKA