Patents by Inventor Yoshitomi Okazaki
Yoshitomi Okazaki 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: 11577346Abstract: Disclosed herein is an electroslag welding wire containing, by mass % based on total mass of the wire: C: more than 0% and 0.07% or less; Si: more than 0% and 0.50% or less; Mn: more than 0% and 1.0% or less; Ni: 6.0 to 15.0%; and Fe: 79% or more. The electroslag welding wire satisfies the following relationship (1): 0.150?C+Si/30+Mn/20+Ni/60?0.300 (1).Type: GrantFiled: September 4, 2017Date of Patent: February 14, 2023Assignee: Kobe Steel, Ltd.Inventors: Keito Ishizaki, Yimin Yuan, Hidenori Nako, Tomoko Sugimura, Yoshitomi Okazaki
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Publication number: 20190210165Abstract: A flux-cored wire for gas-shielded arc welding, contains, based on the total mass of the wire: C: from 0.03 to 0.12 mass %; Si in terms of Si in Si alloy and Si compound: from 0.10 to 0.50 mass %; Mn: from 1.0 to 4.0 mass %; Ti in terms of Ti in Ti alloy and Ti compound: from 2.4 to 4.5 mass %; Al: from 0.005 to 0.050 mass %; at least one of Ni: from 0.30 to 3.50 mass % and B: from 0.0008 to 0.012 mass %; and Fe: 80 mass % or more, and satisfies (Ti+Mn+Al)/Si?15.Type: ApplicationFiled: September 6, 2017Publication date: July 11, 2019Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)Inventors: Hidenori NAKO, Masaki SHIMAMOTO, Yoshitomi OKAZAKI, Masafumi YAMAKAMI, Shinya ISONO, Keito ISHIZAKI
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Publication number: 20190210164Abstract: Disclosed herein is a flux-cored wire for gas-shielded arc welding containing, based on total mass of the wire: C: from 0.03 to 0.12 mass %; Si in terms of Si in Si alloy and Si compound: from 0.20 to 0.70 mass %; Mn: from 1.0 to 4.0 mass %; Ti in terms of Ti in Ti alloy and Ti compound: from 2.4 to 4.5 mass %; Al: from 0.005 to 0.050 mass %; Ca: from 0.03 to 1.0 mass %; at least one of Ni: from 0.30 to 3.50 mass % and B: from 0.0008 to 0.012 mass %; and Fe: 80 mass % or more, and satisfies: (Ti+Mn+Al+Ca)/Si?12; and Ca/Si: from 0.07 to 0.35.Type: ApplicationFiled: September 6, 2017Publication date: July 11, 2019Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Hidenori NAKO, Masaki SHIMAMOTO, Yoshitomi OKAZAKI, Masafumi YAMAKAMI, Shinya ISONO, Keito ISHIZAKI
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Publication number: 20190210166Abstract: Disclosed herein is an electroslag welding wire containing, by mass % based on total mass of the wire: C: more than 0% and 0.07% or less; Si: more than 0% and 0.50% or less; Mn: more than 0% and 1.0% or less; Ni: 6.0 to 15.0%; and Fe: 79% or more. The electroslag welding wire satisfies the following relationship (1): 0.150?C±Si/30+Mn/20+Ni/60?0.300 (1).Type: ApplicationFiled: September 4, 2017Publication date: July 11, 2019Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel. Ltd.)Inventors: Keito ISHIZAKI, Yimin YUAN, Hidenori NAKO, Tomoko SUGIMURA, Yoshitomi OKAZAKI
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Publication number: 20180147674Abstract: This welded metal contains C, Si, Mn, Ni, Cr, Mo, Ti, B, O, N and Nb+V in specific amounts, respectively, with the balance being made up of Fe and unavoidable impurities. In this welded metal, carbides having circle-equivalent diameters of less than 0.40 ?m have an average circle-equivalent diameter of 0.10 ?m or more, and intergranular carbides having circle-equivalent diameters of 0.40 ?m or more have an average circle-equivalent diameter of 0.75 ?m or less.Type: ApplicationFiled: June 2, 2016Publication date: May 31, 2018Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Yoshitomi OKAZAKI, Hiroyuki KAWASAKI, Peng HAN, Shuji SASAKURA, Yoshihiko KITAGAWA, Mana TAKAWA
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Publication number: 20170274482Abstract: A flux cored wire, which is obtained by filling the inside of a steel outer skin with a flux, is configured to have a composition that contains, in mass % relative to the total mass of the wire, 0.01-0.12% of C, 0.05% or more but less than 0.30% of Si, 1.0-3.5% of Mn, 0.1% or more but less than 1.0% of Ni, 0.10-0.30% of Mo, 0.1-0.9% of Cr, 4.5-8.5% of TiO2, 0.10-0.40% of SiO2, 0.03-0.23% of Al2O3 and 80% or more of Fe.Type: ApplicationFiled: September 2, 2015Publication date: September 28, 2017Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Peng HAN, Hiroyuki KAWASAKI, Yoshihiko KITAGAWA, Hidenori NAKO, Takuya KOCHI, Wataru URUSHIHARA, Yoshitomi OKAZAKI
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Publication number: 20170029923Abstract: The present invention provides a weld metal that exhibits excellent strength and toughness as well as excellent SR cracking resistance that can prevent SR cracking not only at a high temperature of about 690° C. but also at around 600° C., at which temperature SR cracking tends to occur. The weld metal of the present invention includes, C: 0.06 to 0.10%, Si: 0.4 to 0.6%, Mn: 0.5 to 1.0%, Cr: 1.8 to 3.0%, Mo: 0.8 to 1.2%, Ti: 0.02 to 0.08%, B: 0.002% or less (including 0%), N: 0.005 to 0.01%, and O: 0.03 to 0.07%, with the balance being iron and inevitable impurities, wherein the weld metal satisfies the following inequality expression (1): 3.0?13×[C]+[Cr]+160×[B]?4.0??(1) where [C] is a C content, [Cr] is a Cr content, and [B] is a B content.Type: ApplicationFiled: April 9, 2015Publication date: February 2, 2017Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)Inventors: Yoshitomi OKAZAKI, Hidenori NAKO, Ken YAMASHITA, Kazuya IKAI
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Publication number: 20160244865Abstract: The present invention relates to a steel plate with excellent sour resistance, HAZ toughness and HAZ hardness, including, in terms of mass %, C: 0.02-0.20%, Si: 0.02-0.50%, Mn: 0.6-2.0%, P: over 0% and 0.030% or less, S: over 0% and 0.004% or less, Al: 0.010-0.08%, N: 0.001-0.01%, Nb: 0.002% or more and less than 0.05%, O: over 0% and 0.0040% or less, REM: 0.0002-0.05%, and Zr: 0.0003-0.020% with the remainder consisting of iron and inevitable impurities, in which an expression 10,000×[Nb]+31×Di?82?0 (where Di=([C]/10)0.5×(1+0.7×[Si])×(1+3.33×[Mn])×(1+0.35×[Cu])×(1+0.36×[Ni])×(1+2.16×[Cr])×(1+3×[Mo])×(1+1.75×[V])×1.115) is satisfied, and, in the composition of inclusions with 1 ?m or more width contained in steel, Zr amount is 1-40%, REM amount is 5-50%, Al amount is 3-30%, and S amount is over 0% and less than 20%.Type: ApplicationFiled: December 10, 2014Publication date: August 25, 2016Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)Inventors: Akira IBANO, Hidenori NAKO, Yoshitomi OKAZAKI
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Publication number: 20160008931Abstract: This welded metal contains 0.02-0.10% of C, 0.10-0.60% of Si, 0.90-2.5% of Mn, 0.20-2.00% of Ni, 0.05-1.0% of Cr, 0.10-1.50% of Mo, 0.040-0.15% of Ti, 0.0010-0.0050% of B, 0.030-0.100% of O and 0.015% or less (excluding 0%) of N, with the balance made up of iron and unavoidable impurities. The average circle-equivalent diameter of carbides having a circle-equivalent diameter of 0.40 ?m or more among the carbides present in the grain boundary of this welded metal is 0.75 ?m or less. Consequently, the present invention provides: a welded metal which exhibits excellent low-temperature toughness at lower temperatures, while having high strength after SR annealing, even in cases where gas sealed arc welding using a flux cored wire and having excellent work efficiency is applied; and a welded structure which is provided with this welded metal.Type: ApplicationFiled: February 24, 2014Publication date: January 14, 2016Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Hidenori NAKO, Takuya KOCHI, Wataru URUSHIHARA, Hiroyuki KAWASAKI, Peng HAN, Yoshihiko KITAGAWA, Yoshitomi OKAZAKI
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Patent number: 9156112Abstract: The objective of the present invention is to provide a similar-metal-composition welding solid wire, and weld metals therefor, with which both excellent bead shape and high ultralow-temperature toughness for the weld joints can be achieved when welding 9% Ni steels together by means of a high-efficiency MIG welding method. A fixed ratio of a REM and O are included in a similar-metal-composition welding solid wire of a 9% NI steel base material, and oxygen is supplied in a trace amount in a range that does not hinder the ultralow-temperature toughness of the weld joint (1a) but that is capable of forming fine REM oxides in the weld metal (3) and of controlling the weld metal to produce an excellent bead shape. In addition, both Al and Ti are regulated and an argon gas that contains little or no carbon dioxide gas is used as the shield gas in the MIG welding method. Thus, both an excellent bead shape and high ultralow-temperature toughness for the weld joint (1a) can be achieved.Type: GrantFiled: December 22, 2010Date of Patent: October 13, 2015Assignee: Kobe Steel, Ltd.Inventors: Yoshitomi Okazaki, Hidenori Nako, Munenobu Sato, Masafumi Yamakami
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Patent number: 8992698Abstract: Provided is a welding metal in which the chemical component composition thereof is appropriately controlled; an A value that is specified by a predetermined relational expression satisfies the requirement of being 3.8% to 9.0%; an X value that is specified by a predetermined relational expression satisfies the requirement of being 0.5% or greater; the area percentage of carbide particles having a circle-equivalent diameter of 0.20 ?m or greater in the welding metal is 4.0% or less; and the number of carbide particles having a circle-equivalent diameter of 1.0 ?m or greater is 1000 particles/mm2 or less. This welding metal, which can exhibit not only high strength but also good low-temperature toughness and good drop-weight characteristics, is useful as a material for a pressure vessel in a nuclear power plant.Type: GrantFiled: April 8, 2011Date of Patent: March 31, 2015Assignee: Kobe Steel. Ltd.Inventors: Hidenori Nako, Yoshitomi Okazaki, Ken Yamashita, Minoru Otsu, Hideaki Takauchi
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Patent number: 8932415Abstract: Provided is a welding metal in which a predetermined chemical component composition is satisfied, the A value as specified by formula (1) is 3.8% to 9.0%, and the surface area percentage of carbide having a circle-equivalent diameter of 0.20 ?m or greater in the welding metal is 4.0% or less. A value=0.8×[C]?0.05×[Si]+0.5×[Mn]+0.5×[Cu]+[Ni]?0.5×[Mo]+0.2×[Cr]??(1) (Provided that [C], [Si], [Mn], [Cu], [Ni], [Mo] and [Cr] are the C, Si, Mn, Cu, Ni, Mo and Cr content (by mass percent), respectively) The welding metal is useful as a material for a pressure vessel of a nuclear power plant as the welding metal is high in strength and has good low-temperature toughness and drop-weight characteristics.Type: GrantFiled: January 24, 2011Date of Patent: January 13, 2015Assignee: Kobe Steel, Ltd.Inventors: Hidenori Nako, Yoshitomi Okazaki, Ken Yamashita, Minoru Otsu, Hideaki Takauchi
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Patent number: 8574381Abstract: To provide weld metal that has a high strength and toughness in the as-welded condition or in the annealed condition. The weld metal of the present invention contains by weight %, C: 0.04-0.15%, Si: 0.50% or less, Mn: 1.0-1.9%, Ni: 1.0-4.0%, Cr: 0.10-1.0%, Mo: 0.20 to 1.2%, Ti: 0.010-0.060%, Al: 0.030% or less, O: 0.15-0.060%, N: 0.010% or less, Fe and inevitable impurities as the remaining contents. The weld metal is further characterized by the fact that the ratio of Ti content (%) to Si content (%) i.e., [compound type Ti]/[compound type Si] is more than 1.5, and the number A defined by the following formula is 0.50 or more, wherein A=[Ti]/([O]?1.1×[Al]+0.05×[Si]).Type: GrantFiled: March 25, 2010Date of Patent: November 5, 2013Assignee: Kobe Steel, Ltd.Inventors: Hidenori Nako, Yoshitomi Okazaki, Ken Yamashita, Hideaki Takauchi, Minoru Otsu
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Publication number: 20130270246Abstract: The objective of the present invention is to provide a similar-metal-composition welding solid wire, and weld metals therefor, with which both excellent bead shape and high ultralow-temperature toughness for the weld joints can be achieved when welding 9% Ni steels together by means of a high-efficiency MIG welding method. A fixed ratio of a REM and O are included in a similar-metal-composition welding solid wire of a 9% NI steel base material, and oxygen is supplied in a trace amount in a range that does not hinder the ultralow-temperature toughness of the weld joint (1a) but that is capable of forming fine REM oxides in the weld metal (3) and of controlling the weld metal to produce an excellent bead shape. In addition, both Al and Ti are regulated and an argon gas that contains little or no carbon dioxide gas is used as the shield gas in the MIG welding method. Thus, both an excellent bead shape and high ultralow-temperature toughness for the weld joint (1a) can be achieved.Type: ApplicationFiled: December 22, 2010Publication date: October 17, 2013Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Yoshitomi Okazaki, Hidenori Nako, Munenobu Sato, Masafumi Yamakami
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Publication number: 20130028782Abstract: Provided is a welding metal in which the chemical component composition thereof is appropriately controlled; an A value that is specified by a predetermined relational expression satisfies the requirement of being 3.8% to 9.0%; an X value that is specified by a predetermined relational expression satisfies the requirement of being 0.5% or greater; the area percentage of carbide particles having a circle-equivalent diameter of 0.20 ?m or greater in the welding metal is 4.0% or less; and the number of carbide particles having a circle-equivalent diameter of 1.0 ?m or greater is 1000 particles/mm2 or less. This welding metal, which can exhibit not only high strength but also good low-temperature toughness and good drop-weight characteristics, is useful as a material for a pressure vessel in a nuclear power plant.Type: ApplicationFiled: April 8, 2011Publication date: January 31, 2013Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Hidenori Nako, Yoshitomi Okazaki, Ken Yamashita, Minoru Otsu, Hideaki Takauchi
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Publication number: 20120294752Abstract: Provided is a welding metal in which a predetermined chemical component composition is satisfied, the A value as specified by formula (1) is 3.8% to 9.0%, and the surface area percentage of carbide having a circle-equivalent diameter of 0.20 ?m or greater in the welding metal is 4.0% or less. A value=0.8×[C]?0.05×[Si]+0.5×[Mn]+0.5×[Cu]+[Ni]?0.5×[Mo]+0.2×[Cr]??(1) (Provided that [C], [Si], [Mn], [Cu], [Ni], [Mo] and [Cr] are the C, Si, Mn, Cu, Ni, Mo and Cr content (by mass percent), respectively) The welding metal is useful as a material for a pressure vessel of a nuclear power plant as the welding metal is high in strength and has good low-temperature toughness and drop-weight characteristics.Type: ApplicationFiled: January 24, 2011Publication date: November 22, 2012Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)Inventors: Hidenori Nako, Yoshitomi Okazaki, Ken Yamashita, Minoru Otsu, Hideaki Takauchi
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Publication number: 20120021246Abstract: To provide weld metal that has a high strength and toughness in the as-welded condition or in the annealed condition. The weld metal of the present invention contains by weight %, C: 0.04-0.15%, Si: 0.50% or less, Mn: 1.0-1.9%, Ni: 1.0-4.0%, Cr: 0.10-1.0%, Mo: 0.20 to 1.2%, Ti: 0.010-0.060%, Al: 0.030% or less, O: 0.15-0.060%, N: 0.010% or less, Fe and inevitable impurities as the remaining contents. The weld metal is further characterized by the fact that the ratio of Ti content (%) to Si content (%) i.e.,[compound type Ti]/[compound type Si] is more than 1.5, and the number A defined by the following formula is 0.50 or more, wherein A=[Ti]/([O]?1.1×[Al]+0.05×[Si]).Type: ApplicationFiled: March 25, 2010Publication date: January 26, 2012Applicant: KABUSHIKI KAISHA KOBE SEIKO SHOInventors: Hidenori Nako, Yoshitomi Okazaki, Ken Yamashita, Hideaki Takauchi, Minoru Otsu
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Patent number: 8101029Abstract: A weld metal of a high-strength Cr—Mo steel formed by shielded metal arc welding contains: 0.04 to 0.10% by mass C, 0.15 to 0.5% by mass Si, 0.5 to 1.0% by mass Mn, 2.00 to 3.25% by mass Cr, 0.9 to 1.2% by mass Mo, 0.01 to 0.03% by mass Nb, 0.2 to 0.7% by mass V, 0.003% by mass or below and above 0% by mass B, 0.02 to 0.05% by mass O, and the balance of Fe and inevitable impurities. A residual extracted by electrolytic extraction from only an unaffected zone of the weld metal contains precipitated Cr in a Cr content below 0.3% by mass, and precipitated Nb in a Nb content of 0.005% by mass or above.Type: GrantFiled: February 1, 2008Date of Patent: January 24, 2012Assignee: Kobe Steel, Ltd.Inventors: Yoshitomi Okazaki, Ken Yamashita, Hirohisa Watanabe, Koichi Hosoi
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Patent number: 8043407Abstract: It is an object of the present invention to provide a similar composition metal type welding solid wire capable of forming a welded joint having excellent cryogenic characteristics, such as ensuring a low-temperature toughness equivalent to that of the cryogenic base metal, and in addition, further having a high crack initiation resistance, and a weld metal thereof. The welding solid wire of the present invention is an iron base welding solid wire including carbon: 0.10 mass % or less (not inclusive of 0%), silicon: 0.15 mass % or less (not inclusive of 0%), nickel: 8.0 to 15.0 mass %, manganese: 0.10 to 0.80 mass %, and Al: 0.1 mass % or less (not inclusive of 0%), and oxygen in an amount of 150 ppm or less (inclusive of 0), characterized by including: a REM: 0.005 to 0.040 mass %, or chromium: 4.0 mass % or less (not inclusive of 0%).Type: GrantFiled: October 2, 2008Date of Patent: October 25, 2011Assignee: Kobe Steel, Ltd.Inventors: Hidenori Nako, Hiroyuki Takeda, Yoshitomi Okazaki, Kazuyuki Suenaga, Kohjiroh Nakanishi
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Publication number: 20100206130Abstract: It is an object of the present invention to provide a similar composition metal type welding solid wire capable of forming a welded joint having excellent cryogenic characteristics, such as ensuring a low-temperature toughness equivalent to that of the cryogenic base metal, and in addition, further having a high crack initiation resistance, and a weld metal thereof. The welding solid wire of the present invention is an iron base welding solid wire including carbon: 0.10 mass % or less (not inclusive of 0%), silicon: 0.15 mass % or less (not inclusive of 0%), nickel: 8.0 to 15.0 mass %, manganese: 0.10 to 0.80 mass %, and Al: 0.1 mass % or less (not inclusive of 0%), and oxygen in an amount of 150 ppm or less (inclusive of 0), characterized by including: a REM: 0.005 to 0.040 mass %, or chromium: 4.0 mass % or less (not inclusive of 0%).Type: ApplicationFiled: October 2, 2008Publication date: August 19, 2010Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd)Inventors: Hidenori Nako, Hiroyuki Takeda, Yoshitomi Okazaki, Kazuyuki Suenaga, Kohjiroh Nakanishi