Patents Assigned to Nippon Steel Corporation
  • Patent number: 11060201
    Abstract: An electroplating apparatus is provided that minimizes unplated regions when an alloy plating layer is provided on the surface of a thread on a steel pipe. An electroplating apparatus (10) includes an electrode (1), sealing members (2, 3), and a plating-solution supply unit (4). The electrode (1) faces the thread (Tm). The sealing member (2) is positioned within the steel pipe (P1). The sealing member (3) is attached to the end portion of the steel pipe (P1) and, together with the sealing member (2), forms a receiving space (8). The plating-solution supply unit (4) includes a plurality of nozzles (42). The nozzles (42) are positioned within the receiving space (8) and adjacent one end of the thread (Tm) and arranged around the pipe axis of the steel pipe (P1). The plating-solution supply unit (4) injects a plating solution between the thread (Tm) and electrode (1) through the nozzles (42).
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: July 13, 2021
    Assignees: Nippon Steel Corporation, Vallourec Oil and Gas France
    Inventors: Masanari Kimoto, Kazuya Ishii, Masahiro Oshima
  • Publication number: 20210207235
    Abstract: [Object] To provide a steel sheet for carburizing having further improved formability and toughness after carburizing, and a method for manufacturing the same. [Solution] A steel sheet consisting of, in mass %, C: more than or equal to 0.02%, and less than 0.30%, Si: more than or equal to 0.005%, and less than or equal to 0.5%, Mn: more than or equal to 0.01%, and less than or equal to 3.0%, P: less than or equal to 0.1%, S: less than or equal to 0.1%, sol. Al: more than or equal to 0.0002%, and less than or equal to 3.0%, N: more than or equal to 0.0001, and less than or equal to 0.035%, and the balance: Fe and impurities, in which average crystal grain size of ferrite is smaller than 10 ?m, average equivalent circle diameter of carbide is 5.0 ?m or smaller, percentage of number of carbides with an aspect ratio of 2.
    Type: Application
    Filed: October 2, 2018
    Publication date: July 8, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kazuo HIKIDA, Yuri TODA, Motonori HASHIMOTO
  • Publication number: 20210208085
    Abstract: There is provided a tubular body inner surface inspection apparatus that detects a defect existing on an inner surface of a tubular body, the apparatus including: a tubular body imaging apparatus including N (N?2) imaging units each including a laser light source that applies laser light, an optical element that reflects laser light applied from the laser light source in a circumferential direction of the inner surface of the tubular body, as annular laser light, an area camera that images a region of the inner surface of the tubular body where the annular laser light is applied, and thereby generates an annular beam image, and a linking member that links together and fixes the laser light source and the area camera, in which the imaging units are linked in series along a tube axial direction of the tubular body in such a manner that positions of the linking members in a plane orthogonal to a tube axis are different from each other; a movement apparatus that moves the tubular body imaging apparatus along the
    Type: Application
    Filed: July 30, 2018
    Publication date: July 8, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Toshio AKAGI, Hironao YAMAJI, Takeo NAKATA, Masaki YAMANO
  • Publication number: 20210205877
    Abstract: The device for controlling a flow in a mold in thin-slab casting of steel has a thickness on the short side of the meniscus portion of 150 mm or less and a casting width of 2 m or less and includes a DC magnetic field generation unit and an immersion nozzle having a slit formed at the bottom so that the slit leads to the bottom of the discharge hole and opens outside, the discharge hole and the slit are present in the DC magnetic field zone, and the magnetic flux density B (T) in the DC magnetic field zone and the distance L (m) from the lower end of the immersion nozzle to the lower end of the core satisfy Formulae (1) and (2) described below: 0.35T?B?1.0T??Formula (1) L?0.
    Type: Application
    Filed: June 7, 2019
    Publication date: July 8, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroshi HARADA, Keita IKEDA, Masashi SAKAMOTO, Yui ITO, Takuya TAKAYAMA
  • Publication number: 20210205915
    Abstract: This spot welded joint includes a first steel sheet having tensile strength of 1100 MPa or higher and hard martensitic structure as main structure, a second steel sheet stacked on the first steel sheet, a nugget having diameter D at an interface between the first and second steel sheets and formed between the first and second steel sheets, and a hardness control region occupying, in a cross section of the first steel sheet in sheet thickness direction that passes a nugget center, a region that is the first steel sheet in sheet thickness direction and is from 0.5×D to 1.0×D from the nugget center in sheet surface direction and in which difference between maximum value and minimum value in hardness in the region is 80 HV or less, and the maximum hardness value in the region is lower than the maximum hardness value of the first steel sheet.
    Type: Application
    Filed: May 24, 2019
    Publication date: July 8, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Tasuku ZENIYA, Satoshi HIROSE, Atsuo KOGA, Koichi HAMADA, Masanori YASUYAMA
  • Patent number: 11053574
    Abstract: A non-oriented electrical steel sheet according to an aspect of the present invention contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.2% to 3.3%, P: more than 0% and less than 0.030%, S: more than 0% and 0.0050% or less, sol. Al: more than 0% and 0.0040% or less, N: more than 0% and 0.0040% or less, one or more of La, Ce, Pr, and Nd: 0.0005% to 0.0200% in total, Ca: 0.0005% to 0.0100%, Ti: 0.0005% to 0.0100%, Sn: 0% to 0.10%, Sb: 0% to 0.10%, Mg: 0% to 0.0100%, and a remainder including Fe and impurities, in which Si?0.5×Mn: 2.0% or more, and Si+0.5×Mn: 3.8% or more.
    Type: Grant
    Filed: January 16, 2018
    Date of Patent: July 6, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyoshi Yashiki, Yoshiaki Natori, Kazutoshi Takeda, Susumu Mukawa, Takuya Matsumoto, Koji Fujita, Takashi Morohoshi, Masafumi Miyazaki
  • Patent number: 11052433
    Abstract: An ultrasonic cleaning equipment (1) according to the present invention includes a treatment tank (10) that stores a cleaning liquid that cleans an object to be cleaned and in which the object to be cleaned is immersed; an ultrasonic application mechanism (20) that applies ultrasonic waves to the cleaning liquid retained in an interior of the treatment tank; and a curved surface member (30) that is located in a range defined by an angle of inclination from a perpendicular direction in an end portion of a vibrating surface of the ultrasonic application mechanism to an outside with respect to the vibrating surface and that is held on a wall surface and/or a bottom surface of the treatment tank.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: July 6, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Eri Hoshiba, Hiromitsu Date, Takumi Nishimoto, Kenichi Uemura
  • Patent number: 11056687
    Abstract: A negative electrode active material is provided that is utilized in a nonaqueous electrolyte secondary battery, and that can improve the capacity per volume and charge-discharge cycle characteristics. The negative electrode active material according to the present embodiment contains an alloy having a chemical composition consisting of, in at %, Sn: 13.0 to 24.5% and Si: 3.0 to 15.0%, with the balance being Cu and impurities. The alloy particles contain a phase with a peak of the most intense diffraction line appearing in a range of 42.0 to 44.0 degrees of a diffraction angle 2?, the most intense diffraction line being a diffraction line having the largest integrated diffraction intensity in an X-ray diffraction profile. A half-width of the most intense diffraction line of the alloy particles is in a range of 0.15 to 2.5 degrees.
    Type: Grant
    Filed: May 18, 2017
    Date of Patent: July 6, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Sukeyoshi Yamamoto, Tatsuo Nagata, Koji Moriguchi
  • Publication number: 20210197899
    Abstract: To improve the collision performance of a panel member of an automobile. A panel member 1 includes a plurality of circular recessed parts 10 linearly arranged, wherein: when it is assumed that a portion where three recessed parts 10 are linearly aligned is called a recessed part group G, there are at least a first recessed part group G1 and a second recessed part group G2 arranged in parallel with the first recessed part group G1; and an angle formed between a first straight line L1 linking a center of the recessed part 10 in the first recessed part group G1 and a center of the recessed part 10 in the second recessed part group G2 located at a position closest to the recessed part 10, and, a second straight line L2 linking centers of the recessed parts 10 in the first recessed part group G1 is 80 degrees or more and 100 degrees or less.
    Type: Application
    Filed: September 13, 2019
    Publication date: July 1, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Satoshi HIROSE, Keiichi SATO, Yoshimichi KAWAI
  • Publication number: 20210197525
    Abstract: To solve the problem about the difference in temperature increasing rate between an overlapped part and a one-sheet part so as to further improve the corrosion resistance of plating after hot stamping.
    Type: Application
    Filed: April 5, 2019
    Publication date: July 1, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Soshi FUJITA, Yuki SUZUKI, Masahiro FUDA, Jun MAKI, Hideaki IRIKAWA, Masahiro NAKATA
  • Publication number: 20210198780
    Abstract: A hot-dip galvanized steel sheet includes a plated layer formed on at least a part of a surface of a steel sheet, the plated layer containing: Al in a range from 10 mass % to 40 mass %; Si in a range from 0.05 mass % to 4 mass %; Mg in a range from 0.5 mass % to 4 mass %; and the balance consisting of Zn and inevitable impurities. The plated layer has a lamellar structure in which a layered Zn phase and a layered Al phase are alternately arranged in a cross section of the plated layer, the lamellar structure accounting for 5% or more by an area fraction in the cross section, and a total abundance ratio of an intermetallic compound containing at least one of Fe, Mn, Ti, Sn, In, Bi, Pb or B is regulated to 3% or less by the area fraction.
    Type: Application
    Filed: December 28, 2017
    Publication date: July 1, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventor: Takuya MITSUNOBU
  • Patent number: 11045865
    Abstract: Provided is a production method, including a first preforming process, a second preforming process, and a finish forging process. In the first preforming process, while a plurality of flat parts are formed, a region to be a second pin is decentered. The second preforming process includes: a process of pressing each region to be a plurality of journals in a pressing direction corresponding to a width direction of the flat part by using a pair of second dies; and a process of, after starting the pressing by the second dies, decentering a region to be a first pin and to be disposed in a first position and a region to be a third pin and to be disposed in a third position from each other in opposite directions with a width direction of the flat part being as a decentering direction by using third dies.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: June 29, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Junichi Okubo, Kenji Tamura, Kunihiro Yoshida, Sam Soo Hwang, Ryusuke Nakano, Masao Hori, Yukihiro Ota
  • Patent number: 11045864
    Abstract: Disclosed is a method for producing a forged crankshaft. This production method includes: a pressing step of pressing a part in a longitudinal direction (first region) of a bar-like member with a pair of first dies, thereby decreasing a cross sectional area of the first region; and a decentering step of decentering a second region of the bar-like member with a second die with the first region being held. The second region is at least a part of the region of the bar-like member excepting the first region. The decentering direction by the second die is a direction perpendicular to each of the pressing direction by the first dies and the longitudinal direction of the bar-like member.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: June 29, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kenji Tamura, Junichi Okubo
  • Publication number: 20210190731
    Abstract: There are provided an ultrasonic waveform data generation unit (123) that generates ultrasonic waveform data representing amplitudes of reflected ultrasonic beams received by a reception unit (132) in time series for each of ultrasonic elements (111) forming reception ultrasonic elements (114), an ultrasonic waveform data processing unit (124) that uses a plurality of origin time adjustment patterns, in which a plurality of relative positional relationships between a phased array probe (110) and a welded portion (210) are set, and performs processing to synthesize pieces of the ultrasonic waveform data each having the adjusted origin time to generate synthesized ultrasonic waveform data according to each of the origin time adjustment patterns, and a defect evaluation unit (125) that evaluates whether or not a defect (211) is present in the welded portion (210) based on the synthesized ultrasonic waveform data.
    Type: Application
    Filed: December 11, 2018
    Publication date: June 24, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yoshio UEDA, Kohei OKAMOTO
  • Publication number: 20210189535
    Abstract: This nickel-containing steel for low temperature includes, as a chemical composition, by mass %: C: 0.020% to 0.070%; Si: 0.03% to 0.30%; Mn: 0.20% to 0.80%; Ni: 12.5% to 17.4%; Al: 0.010% to 0.060%; N: 0.0015% to 0.0060%; and O: 0.0007% to 0.0030%, in which a metallographic structure contains 2.0% to 30.0% of an austenite phase by volume fraction %, in a thickness middle portion of a section parallel to a rolling direction and a thickness direction, an average grain size of prior austenite grains is 3.0 ?m to 20.0 ?m, and an average aspect ratio of the prior austenite grains is 1.0 to 2.9.
    Type: Application
    Filed: October 26, 2017
    Publication date: June 24, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Manabu HOSHINO, Tetsuya NAMEGAWA, Shinichi OMIYA, Takayuki KAGAYA
  • Publication number: 20210187908
    Abstract: A metal-fiber reinforced resin material composite is provided which improves the shear strength between a metallic member and a fiber reinforced material by more strongly bonding the metallic member and the fiber reinforced resin member, and which is very light and has excellent workability while increasing strength. [Solution] This metal-fiber reinforced resin material composite is provided with a metallic member and with a fiber reinforced resin material that is stacked on at least one surface of the metallic member and combined with the metallic member, wherein the fiber reinforced resin material comprises a matrix resin containing a thermoplastic resin, a reinforcing fiber material included in the matrix resin, and a resin layer interposed between the reinforcing fiber material and the metallic member and comprising a resin of the same type as the matrix resin. The shear strength of the metallic member and the fiber reinforced resin material is greater than or equal to 0.8 MPa.
    Type: Application
    Filed: December 28, 2018
    Publication date: June 24, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masaharu IBARAGI, Noriyuki NEGI, Masafumi USUI, Masako NAKAI
  • Publication number: 20210190427
    Abstract: This electric furnace includes one or more upper electrodes, one or more bottom-blowing tuyeres, a mechanical stirrer equipped with an impeller, and a charging device which injects an iron oxide-containing iron raw material.
    Type: Application
    Filed: October 17, 2018
    Publication date: June 24, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Takahiro TAGUCHI, Tsuyoshi YAMAZAKI, Shuhei KASAHARA
  • Publication number: 20210189144
    Abstract: The titanium material includes a titanium oxide layer formed on a surface of titanium being a base material, the titanium oxide layer having a thickness measured by a glow discharge spectrometry of 60 to 300 nm, wherein: the titanium oxide layer contains 0.5 to 7.0 at % of nitrogen, and an arithmetic mean roughness Ra of a surface thereof is 2.0 to 4.0 ?m; and a power spectrum of a surface roughness of the titanium material has a peak of an amplitude height of 0.005 to 0.020 ?m in a range of a wavelength of 1.1 to 2.5 ?m and has a peak of an amplitude height of 0.0010 to 0.0030 ?m in a range of a wavelength of 0.80 to 0.98 ?m. An L*a*b* color space may be L*: 30 to 40, a*: 2.0 to 9.0, and b*: ?7.0 to 18.0.
    Type: Application
    Filed: June 18, 2018
    Publication date: June 24, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Michio KANEKO, Kiyonori TOKUNO, Takao WADA, Mitsuyuki HASEGAWA, Kazuo YAMAGISHI, Mitsuru NAKAYAMA
  • Patent number: 11041225
    Abstract: A heat-treated steel sheet member having a chemical including, by mass %: C: 0.05 to 0.50%; Si: 0.50 to 5.0%; Mn: 1.5 to 4.0%; P: 0.05% or less; S: 0.05% or less; N: 0.01% or less; Ti: 0.01 to 0.10%; B: 0.0005 to 0.010%; Cr: optional amounts of Ni, Cu, Mo, V, Ca, Al, Nb, and REM, with the balance: Fe and impurities. The steel sheet member has a microstructure comprising: mainly martensite; and retained austenite of which a volume ratio is 5.0% or higher, a number density of retained carbide in the steel sheet member having circle-equivalent diameters of 0.1 mm or larger is 4.0×103/mm2 or lower, [(log fg0?log fg(0.02))/0.02<20.0] is satisfied when mechanical properties are measured using a sheet specimen specified in ASTM E8, a tensile strength is 1.4 GPa or higher, and a total elongation is 8.0% or higher.
    Type: Grant
    Filed: April 7, 2016
    Date of Patent: June 22, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Yoshihiro Suwa, Shinichiro Tabata, Masafumi Azuma, Kazuo Hikida
  • Patent number: 11041232
    Abstract: An austenitic stainless steel is provided which has a chemical composition that consists, by mass %, of: C: 0.015% or less, Si: 1.00% or less, Mn: 2.00% or less, P: 0.05% or less, S: 0.030% or less, Cr: 16.0% or more and less than 22.0%, Ni: 11.0 to 16.0%, Mo: 2.5 to 5.0%, N: 0.07% or more and less than 0.15%, Nb: 0.20 to 0.50%, Al: 0.005 to 0.040%, Sn: 0 to 0.080%, Zn: 0 to 0.0060%, Pb: 0 to 0.030%, and the balance: Fe and impurities, and that satisfies the formula [MoSS/Mo?0.98] (MoSS: Mo amount dissolved in the steel).
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: June 22, 2021
    Assignee: Nippon Steel Corporation
    Inventors: Masahiro Seto, Masayuki Sagara, Kenta Yamada, Takahiro Osuki