Patents by Inventor Tomoko Sugimura

Tomoko Sugimura 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: 20190292639
    Abstract: Disclosed herein is a duplex stainless steel material including a ferrite phase and an austenite phase, wherein the steel material contains, as metal component composition, at least one X-group element selected from 0.01 to 0.50 mass % of V, 0.0001 to 0.0500 mass % of Ti, 0.0005 to 0.0500 mass % of Nb, and 0.01 to 0.50 mass % of Ta. The steel material has composite inclusions or has composite inclusions and inclusions, in which each of the inclusions includes at least one of an oxide, a sulfide, and an oxysulfide; each of the composite inclusions includes one of the inclusions as a nucleus and includes an outer shell existing around the nucleus and having a carbide or a nitride containing Cr and the at least one X-group element, and the proportion of the number of the composite inclusions with respect to the total number of the inclusions is 30% or more.
    Type: Application
    Filed: November 2, 2016
    Publication date: September 26, 2019
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Yuuko FUKUTA, Masaki Shimamoto, Tomoko Sugimura, Makoto Kawamori, Yuutarou Katsuki, Yosuke Yonenaga, Junichiro Kinugasa
  • Publication number: 20190210166
    Abstract: 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: Application
    Filed: September 4, 2017
    Publication date: July 11, 2019
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel. Ltd.)
    Inventors: Keito ISHIZAKI, Yimin YUAN, Hidenori NAKO, Tomoko SUGIMURA, Yoshitomi OKAZAKI
  • Publication number: 20180320255
    Abstract: A steel wire rod for a spring includes: C: 0.2 to 1.2%, Si: 1.0 to 3%, Mn: 0.1 to 2%, Cr: 3% or less (not inclusive of 0%), Al: 0.0002 to 0.005%, Ca: 0.0002 to 0.002%, Ti: 0.0003 to 0.010%, and balance: iron and unavoidable impurities. An average composition of oxide-based inclusions having a minor axis of 1 ?m or more which are present in a cross section satisfies CaO: 35% or less, Al2O3: 40% or less, SiO2: 30 to 95%, MgO: 8% or less, MnO: 5% or less, TiO2: 3 to 10%, and CaO+Al2O3+SiO2+MgO+MnO+TiO2?80%. The number of oxide-based inclusions having a minor axis of 2 ?m or more which are present in the cross section is more than 0.002 inclusions/mm2.
    Type: Application
    Filed: July 16, 2018
    Publication date: November 8, 2018
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Tomoko Sugimura, Masaki Shimamoto, Yosuke Shindo, Masaki Kaizuka, Akihiro Owaki, Sei Kimura
  • Publication number: 20180016653
    Abstract: This steel material for bearings includes prescribed components in the steel, the oxide inclusions in the steel that have a minor axis of 1 ?m or greater satisfying the following conditions (1) and (2). (1) The average composition contains specific respective amounts of CaO, Al2O3, SiO2, and TiO2, and CaO+Al2O3+SiO2+TiO2?60%. (2) The proportion of oxide inclusions in which TiN occurs at the interface of the oxide inclusions and the steel is 30% or more of the total of the oxide inclusions.
    Type: Application
    Filed: January 19, 2016
    Publication date: January 18, 2018
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Masaki SHIMAMOTO, Sei KIMURA, Hiroki OHTA, Katsuhiro IWASAKI, Akihiro OWAKI, Tomoko SUGIMURA
  • Publication number: 20170226602
    Abstract: Disclosed is a method for controlling a Ti concentration in a steel when manufacturing a silicon-deoxidized steel comprising 0.1 to 3% by mass of Si and 0.0001 to 0.005% by mass of Al by ladle refining of a molten steel, the method including the step of: adding an oxide including TiO2 to a slag in a ladle during the ladle refining, wherein the slag produced at end of the ladle refining satisfies formulas (1) to (7) below: 0.5?CaO/SiO2?1.8??(1) 4% by mass?Al2O3?20% by mass??(2) MgO?15% by mass??(3) 1.5% by mass?TiO2?10% by mass??(4) CaO+SiO2+Al2O3+MgO+TiO2?90% by mass??(5) 0.4?TiO2/MnO?5??(6) 1?TiO2/T.Fe?10??(7) where a compound represented by a chemical formula represents the content of the compound in percent by mass; and T.Fe represents the total concentration, in mass ratio, of Fe contained in Fe oxides in the slag.
    Type: Application
    Filed: August 17, 2015
    Publication date: August 10, 2017
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Sei KIMURA, Masaki SHIMAMOTO, Akihiro OWAKI, Yosuke SHINDO, Tomoko SUGIMURA
  • Patent number: 9725779
    Abstract: A Si-killed steel wire rod for obtaining a spring excellent in fatigue properties and a spring excellent in fatigue properties obtained from such steel wire rod are provided. In the Si-killed steel wire rod of the present invention, oxide-based inclusions present in the wire rod contain SiO2: 30-90%, Al2O3: 2-35%, MgO: 35% or below (not inclusive of 0%), CaO: 50% or below (not inclusive of 0%), MnO: 20% or below (not inclusive of 0%) and BaO: 0.2-20% respectively, and total content of (CaO+MgO) is 3% or above.
    Type: Grant
    Filed: December 14, 2015
    Date of Patent: August 8, 2017
    Assignee: KOBE STEEL, LTD.
    Inventors: Tomoko Sugimura, Koichi Sakamoto
  • Publication number: 20160348221
    Abstract: A steel wire rod for a spring includes: C: 0.2 to 1.2%, Si: 1.0 to 3%, Mn: 0.1 to 2%, Cr: 3% or less (not inclusive of 0%), Al: 0.0002 to 0.005%, Ca: 0.0002 to 0.002%, Ti: 0.0003 to 0.010%, and balance: iron and unavoidable impurities. An average composition of oxide-based inclusions having a minor axis of 1 ?m or more which are present in a cross section satisfies CaO: 35% or less, Al2O3: 40% or less, SiO2: 30 to 95%, MgO: 8% or less, MnO: 5% or less, TiO2: 3 to 10%, and CaO+Al2O3+SiO2+MgO+MnO+TiO2?80%. The number of oxide-based inclusions having a minor axis of 2 ?m or more which are present in the cross section is more than 0.002 inclusions/mm2.
    Type: Application
    Filed: January 29, 2015
    Publication date: December 1, 2016
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Tomoko SUGIMURA, Masaki SHIMAMOTO, Yosuke SHINDO, Masaki KAIZUKA, Akihiro OWAKI, Sei KIMURA
  • Patent number: 9441695
    Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3+MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: September 13, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Tomoko Sugimura, Sei Kimura, Koichi Sakamoto, Atsuhiko Yoshida, Takeshi Inoue
  • Patent number: 9394593
    Abstract: Bearing steel material according to the present invention has: a properly adjusted chemical composition; an average chemical composition of oxide-inclusions which comprises 10 to 45% of CaO, 20 to 45% of Al2O3, 30 to 50% of SiO2, up to 15% (exclusive of 0) of MnO, and 3 to 10% of MgO, with the balance being unavoidable impurities; a maximum major axis diameter of the oxide inclusions in a longitudinal section of the steel material of 20 ?m or less; and a spheroidal cementite structure.
    Type: Grant
    Filed: March 5, 2012
    Date of Patent: July 19, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Masaki Kaizuka, Mutsuhisa Nagahama, Masaki Shimamoto, Tomoko Sugimura
  • Publication number: 20160201173
    Abstract: A bearing steel material which contains 0.8-1.1 mass % C, 0.15-0.8 mass % Si, 0.1-1.0 mass % Mn, 1.3-1.8 mass % Cr, up to 0.05 mass % P (0 mass % is excluded), up to 0.015 mass % S (0 mass % excluded), 0.0002-0.005 mass % Al, 0.0002-0.0020 mass % Ca, 0.0005-0.010 mass % Ti, up to 0.0080 mass % N (0 mass % is excluded), and up to 0.0025 mass % O (0 mass % is excluded). The steel material contains oxide inclusions which have an average composition that comprises, in terms of mass %, 20-50% CaO, 20-50% Al2O3, 20-70% SiO2, and 3-10% TiO2.
    Type: Application
    Filed: March 18, 2016
    Publication date: July 14, 2016
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.)
    Inventors: Masaki SHIMAMOTO, Yosuke SHINDO, Masaki KAIZUKA, Akihiro OWAKI, Sei KIMURA, Tetsushi DEURA, Tomoko SUGIMURA
  • Patent number: 9359661
    Abstract: A bearing steel material which contains 0.8-1.1 mass % C, 0.15-0.8 mass % Si, 0.1-1.0 mass % Mn, 1.3-1.8 mass % Cr, up to 0.05 mass % P (0 mass % is excluded), up to 0.015 mass % S (0 mass % excluded), 0.0002-0.005 mass % Al, 0.0002-0.0020 mass % Ca, 0.0005-0.010 mass % Ti, up to 0.0080 mass % N (0 mass % is excluded), and up to 0.0025 mass % O (0 mass % is excluded). The steel material contains oxide inclusions which have an average composition that comprises, in terms of mass %, 20-50% CaO, 20-50% Al2O3, 20-70% SiO2, and 3-10% TiO2.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: June 7, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Masaki Shimamoto, Yosuke Shindo, Masaki Kaizuka, Akihiro Owaki, Sei Kimura, Tetsushi Deura, Tomoko Sugimura
  • Publication number: 20160130674
    Abstract: A Si-killed steel wire rod for obtaining a spring excellent in fatigue properties and a spring excellent in fatigue properties obtained from such steel wire rod are provided. In the Si-killed steel wire rod of the present invention, oxide-based inclusions present in the wire rod contain SiO2: 30-90%, Al2O3: 2-35%, MgO: 35% or below (not inclusive of 0%), CaO: 50% or below (not inclusive of 0%), MnO: 20% or below (not inclusive of 0%) and BaO: 0.2-20% respectively, and total content of (CaO+MgO) is 3% or above.
    Type: Application
    Filed: December 14, 2015
    Publication date: May 12, 2016
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel. Ltd.)
    Inventors: Tomoko SUGIMURA, Koichi Sakamoto
  • Patent number: 9290822
    Abstract: A Si-killed steel wire rod for obtaining a spring excellent in fatigue properties and a spring excellent in fatigue properties obtained from such steel wire rod are provided. In the Si-killed steel wire rod of the present invention, oxide-based inclusions present in the wire rod contain SiO2: 30-90%, Al2O3: 2-35%, MgO: 35% or below (not inclusive of 0%), CaO: 50% or below (not inclusive of 0%), MnO: 20% or below (not inclusive of 0%) and BaO: 0.2-20% respectively, and total content of (CaO+MgO) is 3% or above.
    Type: Grant
    Filed: December 3, 2007
    Date of Patent: March 22, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Tomoko Sugimura, Koichi Sakamoto
  • Publication number: 20150369322
    Abstract: This Si-killed steel wire rod has Si-killed steel which contains specific chemical components that contain, as 80% or more of the number of inclusions, specific CaO—Al2O3—SiO2 inclusions, wherein the average composition of the MnO—Al2O3—SiO2 inclusions that satisfies the following (3A) satisfies the following (3B). (3A) If CaO+Al2O3+SiO2+MgO+MnO serves as the 100% standard, MnO+Al2O3+SiO2?80%, MnO>CaO. (3B) When CaO+Al2O3+SiO2+MgO+MnO serves as the 100% standard, MnO: 10 to 70%, Al2O3: 3 to 50%, SiO2: 20 to 75%.
    Type: Application
    Filed: January 15, 2014
    Publication date: December 24, 2015
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Tomoko SUGIMURA, Hiroaki SAKAI, Yasumasa YOSHIDA, Hirofumi TAI, Hiroki OHTA, Hiroyuki ONODA
  • Patent number: 9062361
    Abstract: A Si-killed steel wire rod for obtaining a spring excellent in fatigue properties and a spring excellent in fatigue properties obtained from the steel wire rod are provided. The Si-killed steel wire rod of the present invention contains Sr: 0.03-20 ppm (means “mass ppm”, hereinafter the same), Al: 1-30 ppm and Si: 0.2-4% (means “mass %”, hereinafter the same) respectively, and contains Mg and/or Ca by a range of 0.5-30 ppm in total. Also, in the Si-killed steel wire rod of the present invention, oxide-based inclusions present in the wire rod contain SiO2: 30-90%, Al2O3: 2-50%, MgO: 35% or below (not inclusive of 0%), CaO: 50% or below (not inclusive of 0%), MnO: 20% or below (not inclusive of 0%) and SrO: 0.2-15% respectively, and total content of (CaO+MgO) is 3% or above. A spring excellent in fatigue properties can be obtained by forming the spring from such steel wire rod.
    Type: Grant
    Filed: December 3, 2007
    Date of Patent: June 23, 2015
    Assignee: Kobe Steel, Ltd.
    Inventors: Tomoko Sugimura, Koichi Sakamoto
  • Publication number: 20150147223
    Abstract: A bearing steel material which contains 0.8-1.1 mass % C, 0.15-0.8 mass % Si, 0.1-1.0 mass % Mn, 1.3-1.8 mass % Cr, up to 0.05 mass % P (0 mass % is excluded), up to 0.015 mass % S (0 mass % excluded), 0.0002-0.005 mass % Al, 0.0002-0.0020 mass % Ca, 0.0005-0.010 mass % Ti, up to 0.0080 mass % N (0 mass % is excluded), and up to 0.0025 mass % O (0 mass % is excluded). The steel material contains oxide inclusions which have an average composition that comprises, in terms of mass %, 20-50% CaO, 20-50% Al2O3, 20-70% SiO2, and 3-10% TiO2.
    Type: Application
    Filed: July 17, 2013
    Publication date: May 28, 2015
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.)
    Inventors: Masaki Shimamoto, Yosuke Shindo, Masaki Kaizuka, Akihiro Owaki, Sei Kimura, Tetsushi Deura, Tomoko Sugimura
  • Publication number: 20150118097
    Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3 +MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.
    Type: Application
    Filed: January 9, 2015
    Publication date: April 30, 2015
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.)
    Inventors: Tomoko SUGIMURA, Sei KIMURA, Koichi SAKAMOTO, Atsuhiko YOSHIDA, Takeshi INOUE
  • Patent number: 8900381
    Abstract: Disclosed is a spring steel which contains, by mass, 1.2% or less C; 0.1% to 2% Mn; 0.2% to 3% Si; 0.0003% to 0.005% Al; to 8 ppm Li; 30 ppm or less (excluding 0 ppm) Ca; and 10 ppm or less (excluding 0 ppm) Mg. The steel contains oxide inclusions satisfying the following conditions (1) to (3) in a number of 1×10?4 or more per square millimeter: (1) containing a total of 80 percent by mass or more of Al2O3 and SiO2 based on the inclusion composition excluding Li2O; (2) having a ratio by mass of Al2O3 to SiO2 of from 1:4 to 2:3; and (3) containing lithium (Li). The spring steel gives a spring that exhibits superior fatigue properties without strict control of the average composition of inclusions.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: December 2, 2014
    Assignee: Kobe Steel, Ltd.
    Inventors: Tomoko Sugimura, Koichi Sakamoto, Atsuhiko Yoshida, Kei Masumoto
  • Publication number: 20140017112
    Abstract: Bearing steel material according to the present invention has: a properly adjusted chemical composition; an average chemical composition of oxide-inclusions which comprises 10 to 45% of CaO, 20 to 45% of Al2O3, 30 to 50% of SiO2, up to 15% (exclusive of 0) of MnO, and 3 to 10% of MgO, with the balance being unavoidable impurities; a maximum major axis diameter of the oxide inclusions in a longitudinal section of the steel material of 20 ?m or less; and a spheroidal cementite structure.
    Type: Application
    Filed: March 5, 2012
    Publication date: January 16, 2014
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Masaki Kaizuka, Mutsuhisa Nagahama, Masaki Shimamoto, Tomoko Sugimura
  • Patent number: 8613809
    Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3+MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: December 24, 2013
    Assignee: Kobe Steel, Ltd.
    Inventors: Tomoko Sugimura, Sei Kimura, Koichi Sakamoto, Atsuhiko Yoshida, Takeshi Inoue