Patents by Inventor Kiyoko Takeda
Kiyoko Takeda 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: 11739407Abstract: The production method of a Ni-based alloy according to the present embodiment includes: a casting step of casting a liquid alloy which is a raw material of the Ni-based alloy to produce a Ni-based alloy starting material; and a segregation reducing step of performing, on the Ni-based alloy starting material produced by the casting step, heat treatment, or the heat treatment and complex treatment including hot working and heat treatment after the hot working, to satisfy Formula (1): where, each symbol in Formula (1) is as follows: V R - 0.294 ? 1.27 × 10 3 ? ? n = 1 N ( 1 - Rd n - 1 100 ) - 1 · exp ? ( - 2.89 × 10 4 T n + 273 ) · t n ( 1 ) VR: Solidification cooling rate (° C./min) of the liquid alloy, Tn: Holding temperature (° C.Type: GrantFiled: November 28, 2018Date of Patent: August 29, 2023Assignee: NIPPON STEEL CORPORATIONInventors: Takamitsu Takagi, Masaaki Terunuma, Kiyoko Takeda
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Publication number: 20220380872Abstract: Provided is an alloy having a high strength and a low thermal expansion coefficient. The alloy according to the present disclosure includes a chemical composition containing, in mass %: C: 0.10% or less, Si: 0.50% or less, Mn: 0.15 to 0.60%, P: 0.015% or less, 5: 0.0030% or less, Ni: 30.0 to 40.0%, Cr: 0.50% or less, Mo: 0.50% or less, Co: 0.250% or less, Al: 0.0150% or less, Ca: 0.0050% or less, Mg: 0.0300% or less, N: 0.0100% or less, O: 0.0300% or less, Pb: 0.0040% or less, and Zn: 0.020% or less, one or more elements selected from the group consisting of Nb: 0 to less than 0.145%, Ti: 0 to less than 0.145%, and. V: 0 to less than 0.145%: 0.015 to less than 0.145% in total, with the balance being Fe and impurities, and satisfying Formula (1). (Nb+3×Ti+V)/(C+N)?6.Type: ApplicationFiled: December 25, 2020Publication date: December 1, 2022Inventors: Kiyoko TAKEDA, Shunichi OTSUKA
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Patent number: 11215356Abstract: An Ni-based alloy pipe for nuclear power has a chemical composition consisting of, in mass percent: C: 0.015 to 0.030%, Si: 0.10 to 0.50%, Mn: 0.10 to 0.50%, P: 0.040% or less, S: 0.015% or less, Cu: 0.01 to 0.20%, Ni: 50.0 to 65.0%, Cr: 19.0 to 35.0%, Mo: 0 to 0.40%, Co: 0.040% or less, Al: 0.30% or less, N: 0.010 to 0.080%, Ti: 0.020 to 0.180%, Zr: 0.010% or less, and Nb: 0.060% or less, the balance: Fe and impurities, and satisfying [(N?Ti×14/48)×d3?4000] in relation to an average grain diameter, wherein a standard deviation of grain diameters is 20 ?m or less, and a hardness of insides of grains is 180 HV or more.Type: GrantFiled: June 7, 2018Date of Patent: January 4, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Kiyoko Takeda, Hirokazu Okada, Osamu Miyahara
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Publication number: 20200392612Abstract: The production method of a Ni-based alloy according to the present embodiment includes: a casting step of casting a liquid alloy which is a raw material of the Ni-based alloy to produce a Ni-based alloy starting material; and a segregation reducing step of performing, on the Ni-based alloy starting material produced by the casting step, heat treatment, or the heat treatment and complex treatment including hot working and heat treatment after the hot working, to satisfy Formula (1): where, each symbol in Formula (1) is as follows: V R - 0.294 ? 1.27 × 10 3 ? ? ? n = 1 N ? ? ( 1 - Rd n - 1 100 ) - 1 · exp ? ( - 2.89 × 10 4 T n + 273 ) · t n ( 1 ) VR: Solidification cooling rate (° C./min) of the liquid alloy, Tn: Holding temperature (° C.Type: ApplicationFiled: November 28, 2018Publication date: December 17, 2020Inventors: Takamitsu TAKAGI, Masaaki TERUNUMA, Kiyoko TAKEDA
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Patent number: 10767245Abstract: Provided is a nickel material having excellent corrosion resistance and high strength, and a method for manufacturing the nickel material. A nickel material has a chemical composition consisting of, in mass %, C: 0.001 to 0.20%, Si: 0.15% or less, Mn: 0.50% or less, P: 0.030% or less, S: 0.010% or less, Cu: 0.10% or less, Mg: 0.15% or less, Ti: 0.005 to 1.0%, Nb: 0.040 to 1.0%, Fe: 0.40% or less, sol. Al: 0.01 to 0.10%, an N: 0.0010 to 0.080%, with the balance being Ni and impurities, and satisfying Formula (1) and Formula (2). 0.030?( 45/48)Ti+( 5/93)Nb?( 1/14)N<0.25??(1) 0.030<( 3/48)Ti+( 88/93)Nb?( 1/12)C??(2) A content (mass %) of a corresponding element is substituted for each element symbol in Formula (1) and Formula (2).Type: GrantFiled: October 6, 2017Date of Patent: September 8, 2020Assignee: Nippon Steel CorporationInventors: Kiyoko Takeda, Masaaki Terunuma
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Publication number: 20200158329Abstract: An Ni-based alloy pipe for nuclear power has a chemical composition consisting of, in mass percent: C: 0.015 to 0.030%, Si: 0.10 to 0.50%, Mn: 0.10 to 0.50%, P: 0.040% or less, S: 0.015% or less, Cu: 0.01 to 0.20%, Ni: 50.0 to 65.0%, Cr: 19.0 to 35.0%, Mo: 0 to 0.40%, Co: 0.040% or less, Al: 0.30% or less, N: 0.010 to 0.080%, Ti: 0.020 to 0.180%, Zr: 0.010% or less, and Nb: 0.060% or less, the balance: Fe and impurities, and satisfying [(N?Ti×14/48)×d3?4000] in relation to an average grain diameter, wherein a standard deviation of grain diameters is 20 ?m or less, and a hardness of insides of grains is 180 HV or more.Type: ApplicationFiled: June 7, 2018Publication date: May 21, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Kiyoko TAKEDA, Hirokazu OKADA, Osamu MIYAHARA
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Publication number: 20200087759Abstract: An austenitic alloy material is provided that includes a base metal having a surface, and a film containing chromium oxide having a thickness of 0.1 to 50 ?m on at least one portion of the surface. A chemical composition at a depth position in the film at which the Cr concentration is highest contains, by atom %, 50% or more of Cr as a proportion occupied among components excluding O, C and N. The chemical composition of the base metal consists of, by mass %, C: 0.001 to 0.6%, Si: 0.01 to 5.0%, Mn: 0.1 to 10.0%, P: 0.08% or less, S: 0.05% or less, Cr: 15.0 to 55.0%, Ni: 30.0 to 80.0%, N: 0.001 to 0.25%, O: 0.02% or less, Mo: 0 to 20.0%, Cu: 0 to 5.0%, Co: 0 to 5.0%, W: 0 to 10.0%, Ta: 0 to 6.0%, Nb: 0 to 5.0%, Ti: 0 to 1.0%, B: 0 to 0.1%, Zr: 0 to 0.1%, Hf: 0 to 0.1%, Al: 0 to 1.0%, Mg: 0 to 0.1%, and Ca: 0 to 0.1%, the balance being Fe and impurities.Type: ApplicationFiled: June 28, 2017Publication date: March 19, 2020Applicant: Nippon Steel & Sumitomo Metal CorporationInventors: Yasuhiro Masaki, Kiyoko Takeda, Takahiro Osuki
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Publication number: 20200040431Abstract: Provided is a nickel material having excellent corrosion resistance and high strength, and a method for manufacturing the nickel material. A nickel material has a chemical composition consisting of, in mass %, C: 0.001 to 0.20%, Si: 0.15% or less, Mn: 0.50% or less, P: 0.030% or less, S: 0.010% or less, Cu: 0.10% or less, Mg: 0.15% or less, Ti: 0.005 to 1.0%, Nb: 0.040 to 1.0%, Fe: 0.40% or less, sol. Al: 0.01 to 0.10%, an N: 0.0010 to 0.080%, with the balance being Ni and impurities, and satisfying Formula (1) and Formula (2). 0.030?( 45/48)Ti+( 5/93)Nb?( 1/14)N<0.25??(1) 0.030<( 3/48)Ti+( 88/93)Nb?( 1/12)C??(2) A content (mass %) of a corresponding element is substituted for each element symbol in Formula (1) and Formula (2).Type: ApplicationFiled: October 6, 2017Publication date: February 6, 2020Inventors: Kiyoko Takeda, Masaaki Terunuma
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Patent number: 10550451Abstract: An object of the present invention is to provide an Ni-based alloy pipe or tube for nuclear power with reduced rate of SCC crack propagation. The Ni-based alloy pipe or tube for nuclear power according to the present invention is an Ni-based alloy pipe or tube having a wall thickness of 15 to 55 mm, having a chemical composition of, in mass %: 0.010 to 0.025% C; 0.10 to 0.50% Si; 0.01 to 0.50% Mn; up to 0.030% P; up to 0.002% S; 52.5 to 65.0% Ni; 20.0 to 35.0% Cr; 0.03 to 0.30% Mo; up to 0.018% Co; up to 0.015% Sn; 0.005 to 0.050% N; 0 to 0.300% Ti; 0 to 0.200% Nb; 0 to 0.300% Ta; 0% or more and less than 0.03% Zr; and the balance being Fe and impurities, wherein the Ni-based alloy pipe or tube has a microstructure being an austenite single phase, and the chemical composition satisfies the following equation, Eq. (1): ?0.0020?[N]/14?{[Ti]/47.9+[Nb]/92.9+[Ta]/180.9+[Zr]/91.2}?0.0015??Eq. (1). For the element symbols in Eq. (1), the contents of the corresponding elements in mass % are substituted.Type: GrantFiled: June 21, 2016Date of Patent: February 4, 2020Assignee: Nippon Steel CorporationInventors: Kiyoko Takeda, Shoji Kinomura
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Publication number: 20190100826Abstract: An objective of the present invention is to provide a Ni—Fe—Cr alloy having an excellent intergranular corrosion resistance. A Ni—Fe—Cr alloy of the present embodiment has a chemical composition consisting of, in mass percent, C: 0.005 to 0.015%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.5%, P: 0.030% or less, S: 0.020% or less, Cu: 1.0 to 5.0%, Ni: 30.0 to 45.0%, Cr: 18.0 to 30.0%, Mo: 2.0 to 4.5%, Ti: 0.5 to 2.0%, N: 0.001 to 0.015%, and Al: 0 to 0.50%, with the balance being Fe and impurities. An average grain size d (?m) satisfies Formula (1): d<4.386/(Crel+0.15)??(1) where, Crel in Formula (1) is defined by Formula (2): Crel=C?0.125Ti+0.8571N??(2) where, symbols of elements in Formula (1) and Formula (2) are to be substituted by contents of corresponding elements (mass %).Type: ApplicationFiled: December 28, 2016Publication date: April 4, 2019Inventors: Kiyoko Takeda, Takamitsu Takagi, Hirokazu Okada, Masaaki Terunuma
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Patent number: 10201880Abstract: There is provided a welding material used for welding of SUS310 stainless steel base metal that contains at least one of Nb and V and is excellent in intergranular corrosion resistance, the chemical composition of the welding material consisting, by mass percent, of C: 0.02% or less, Si: 2% or less, Mn: 2% or less, Cr: 26 to 50%, N: 0.15% or less, P: 0.02% or less, S: 0.002% or less, and Ni: a content percentage satisfying [5?Ni?Cr?14], and the balance of Fe and impurities. Also, there is provided a welding joint of an austenitic stainless steel, which consists of the base metal and a weld metal formed by using the welding material.Type: GrantFiled: May 11, 2012Date of Patent: February 12, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Takahiro Osuki, Kiyoko Takeda, Tetsuo Yokoyama, Hiroyuki Anada, Masatoshi Toyoda
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Publication number: 20180163285Abstract: An object of the present invention is to provide an Ni-based alloy pipe or tube for nuclear power with reduced rate of SCC crack propagation. The Ni-based alloy pipe or tube for nuclear power according to the present invention is an Ni-based alloy pipe or tube having a wall thickness of 15 to 55 mm, having a chemical composition of, in mass %: 0.010 to 0.025% C; 0.10 to 0.50% Si; 0.01 to 0.50% Mn; up to 0.030% P; up to 0.002% 5;52.5 to 65.0% Ni; 20.0 to 35.0% Cr; 0.03 to 0.30% Mo; up to 0.018% Co; up to 0.015% Sn; 0.005 to 0.050% N; 0 to 0.300% Ti; 0 to 0.200% Nb; 0 to 0.300% Ta; 0% or more and less than 0.03% Zr; and the balance being Fe and impurities, wherein the Ni-based alloy pipe or tube has a microstructure being an austenite single phase, and the chemical composition satisfies the following equation, Eq. (1): ?0.0020?[N]/14?{[Ti]/47.9+[Nb]/92.9+[Ta]/180.9+[Zr]/91.2}?0.0015 ??Eq. (1). For the element symbols in Eq. (1), the contents of the corresponding elements in mass % are substituted.Type: ApplicationFiled: June 21, 2016Publication date: June 14, 2018Inventors: Kiyoko Takeda, Shoji Kinomura
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Patent number: 8986470Abstract: A nickel material, which comprises by mass percent, C: 0.003 to 0.20% and one or more elements selected from Ti, Nb, V and Ta: a total content less than 1.0%, the contents of these elements satisfying the relationship specified by the formula of “(12/48) Ti+(12/93) Nb+(12/51) V+(12/181) Ta—C?0”, with the balance being Ni and impurities, does not deteriorate in the mechanical properties and corrosion resistance even when it is used at a high temperature for a long time and/or it is affected by the heat affect on the occasion of welding. Therefore, it can be suitably used as a member for use in various chemical plants including facilities for producing caustic soda, vinyl chloride and so on. Each element symbol in the above formula represents the content by mass percent of the element concerned.Type: GrantFiled: April 17, 2009Date of Patent: March 24, 2015Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Hiroyuki Anada, Junichi Higuchi, Kiyoko Takeda
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Publication number: 20140286698Abstract: There is provided a welding material used for welding of SUS310 stainless steel base metal that contains at least one of Nb and V and is excellent in intergranular corrosion resistance, the chemical composition of the welding material consisting, by mass percent, of C: 0.02% or less, Si: 2% or less, Mn: 2% or less, Cr: 26 to 50%, N: 0.15% or less, P: 0.02% or less, S: 0.002% or less, and Ni: a content percentage satisfying [5?Ni?Cr?14], and the balance of Fe and impurities. Also, there is provided a welding joint of an austenitic stainless steel, which consists of the base metal and a weld metal formed by using the welding material.Type: ApplicationFiled: May 11, 2012Publication date: September 25, 2014Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Takahiro Osuki, Kiyoko Takeda, Tetsuo Yokoyama, Hiroyuki Anada, Masatoshi Toyoda
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Publication number: 20120003116Abstract: An austenitic stainless steel, which consists of by mass %, C?0.02%, Si: 0.01 to 0.50%, Mn: 0.01 to 2.0%, Cr: 24 to 26%, Ni: 19 to 22%, Mo: more than 0.10% to less than 0.50%, N: more than 0.04% to not more than 0.15%, and one or two elements selected from Nb?0.30% and V?0.40%, with the balance being Fe and impurities, and among the impurities P?0.030%, S?0.002% and Sn?0.015%, and satisfies [2.5?36Nb+53V+15N?25.0] and [S+{(P+Sn)/2??5.76×10?4×(36Nb+53V+15N)+0.0267] has excellent corrosion resistance, in particular, excellent intergranular corrosion resistance, and further has excellent crack insusceptibility in a weld heat affected zone. This austenitic stainless steel is a particularly excellent material as structural members for a nuclear power plant.Type: ApplicationFiled: September 15, 2011Publication date: January 5, 2012Applicant: SUMITOMO METAL INDUSTRIES, LTD.Inventors: Takahiro OSUKI, Kiyoko Takeda, Tetsuo Yokoyama
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Publication number: 20090269238Abstract: A nickel material, which comprises by mass percent, C: 0.003 to 0.20% and one or more elements selected from Ti, Nb, V and Ta: a total content less than 1.0%, the contents of these elements satisfying the relationship specified by the formula of “( 12/48)Ti+( 12/93)Nb+( 12/51)V+( 12/181)Ta—C?0”, with the balance being Ni and impurities, does not deteriorate in the mechanical properties and corrosion resistance even when it is used at a high temperature for a long time and/or it is affected by the heat affect on the occasion of welding. Therefore, it can be suitably used as a member for use in various chemical plants including facilities for producing caustic soda, vinyl chloride and so on. Each element symbol in the above formula represents the content by mass percent of the element concerned.Type: ApplicationFiled: April 17, 2009Publication date: October 29, 2009Inventors: Hiroyuki ANADA, Junichi HIGUCHI, Kiyoko TAKEDA
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Publication number: 20090081069Abstract: An austenitic stainless steel, which comprises by mass percent, C: not more than 0.10%, Si: 0.01 to 1.0%, Mn: 0.01 to 2%, Cr: 16 to 18%, Ni: more than 10% to less than 14%, Mo: more than 2.0% to not more than 3.0%, N: 0.03 to 0.10%, one or more elements selected from V, Nb and Ti satisfying the following formulas (1) and (2), 0.0013?(V/51)+(Nb/93)+(Ti/48)?0.0025??(1), {(C/12)+(N/14)}?{(V/51)+(Nb/93)+(Ti/48)}?0.0058??(2), wherein each element symbol in the formulas (1) and (2) represents the content (by mass %) of the element concerned, with the balance being Fe and impurities, wherein the content of P is not more than 0.04% and the content of S is not more than 0.003% among the impurities, has excellent corrosion resistance, in particular, excellent intergranular corrosion resistance. The preferable contents of Nb and Ti are not more than 0.030% and not more than 0.050%, respectively.Type: ApplicationFiled: November 25, 2008Publication date: March 26, 2009Inventors: Kiyoko Takeda, Masayuki Sagara, Masaaki Terunuma
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Patent number: 7101446Abstract: An austenitic stainless steel with minimized deformation by heating and cooling treatment after cold working, which consists of, % by mass, C: 0.03% or less, Si: 2 to 4%, Mn: 0.1 to 2%, P: 0.03% or less, S: 0.03% or less, Ni: 9 to 15%, Cr: 15 to 20%, N: 0.02 to 0.2%, Nb: 0.03% or less, each of Mo and Cu or a total of Mo and Cu: 0.2 to 4%, and the balance Fe and impurities, and satisfies the following formulas (1) and (2). This steel can also have good weldability when the following formula (3) is also satisfied in addition to the formulas (1) and (2); 16.9+6.9Ni+12.5Cu?1.3Cr+3.2Mn+9.3Mo?205C?38.5N?6.5Si?120Nb?40??(1) 450?440(C+N)?12.2Si?9.5Mn?13.5Cr?20(Cu+Ni)?18.5Mo??90??(2) 8.2+30(C+N)+0.5Mn+Ni?1.1(1.5Si+Cr+Mo)+2.5Nb??0.8??(3) wherein each element symbol in the formulas (1), (2) and (3) represents the content, % by mass, of each element included in the steel.Type: GrantFiled: June 3, 2005Date of Patent: September 5, 2006Assignee: Sumitomo Metal Industries, Ltd.Inventors: Kiyoko Takeda, Haruhiko Kajimura, Mitsuo Miyahara
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Publication number: 20050232805Abstract: An austenitic stainless steel with minimized deformation by heating and cooling treatment after cold working, which consists of, % by mass, C: 0.03% or less, Si: 2 to 4%, Mn: 0.1 to 2%, P: 0.03% or less, S: 0.03% or less, Ni: 9 to 15%, Cr: 15 to 20%, N: 0.02 to 0.2%, Nb: 0.03% or less, each of Mo and Cu or a total of Mo and Cu: 0.2 to 4%, and the balance Fe and impurities, and satisfies the following formulas (1) and (2). This steel can also have good weldability when the following formula (3) is also satisfied in addition to the formulas (1) and (2); 16.9+6.9Ni+12.5Cu?1.3Cr+3.2Mn+9.3Mo?205C?38.5N?6.5Si?120Nb?40??(1) 450?440(C+N)?12.2Si?9.5Mn?13.5Cr?20(Cu+Ni)?18.5Mo??90??(2) 8.2+30(C+N)+0.5Mn+Ni?1.1(1.5Si+Cr+Mo)+2.5Nb??0.8??(3) wherein each element symbol in the formulas (1), (2) and (3) represents the content, % by mass, of each element included in the steel.Type: ApplicationFiled: June 3, 2005Publication date: October 20, 2005Inventors: Kiyoko Takeda, Haruhiko Kajimura, Mitsuo Miyahara
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Patent number: 5944917Abstract: A stainless steel having excellent corrosion resistance to ozone added water, such as ozone added ultrapure water used in semiconductor manufacturing processes and the like, as well as a manufacturing method. The stainless steel comprises a base metal and an oxide film formed on the surface of the base metal, the base metal being a stainless steel which contains 12 to 30% of Cr, 0 to 35% of Ni, and 1 to 6% of Al and Si while the contents of the other alloying elements are limited to as low a level as possible, the oxide film mainly comprising Al oxide or a Si oxide or both. The oxide film may be formed on the base metal surface through the dry oxidation process or the wet oxidation process. In the stainless steel, metallic ions are rarely dissolved from the base metal into the ozone added water.Type: GrantFiled: May 29, 1997Date of Patent: August 31, 1999Assignee: Sumitomo Metal Industries, Ltd.Inventors: Kiyoko Takeda, Shigeki Azuma, Yoshio Tarutani, Yoshitaka Nishiyama, Yasushi Matsuda