Patents by Inventor Masatoshi Aratani

Masatoshi Aratani 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: 20210310091
    Abstract: Provided is an electric resistance welded steel pipe or tube that develops no quench cracks despite having carbon content of 0.40% or more and has excellent fatigue strength. An electric resistance welded steel pipe or tube comprises: a chemical composition containing, in mass %, C: 0.40% to 0.55%, Si: 0.10% to 1.0%, Mn: 0.10% to 2.0%, P: 0.10% or less, S: 0.010% or less, Al: 0.010% to 0.100%, Cr: 0.05% to 0.30%, Ti: 0.010% to 0.050%, B: 0.0005% to 0.0030%, Ca: 0.0001% to 0.0050%, and N: 0.0005% to 0.0050%, with a balance consisting of Fe and inevitable impurities; and a ferrite decarburized layer at each of an outer surface and an inner surface, the ferrite decarburized layer having a depth of 20 ?m to 50 ?m from the surface.
    Type: Application
    Filed: September 18, 2019
    Publication date: October 7, 2021
    Applicant: JFE STEEL CORPORATION
    Inventors: Masatoshi ARATANI, Ryoji MATSUI, Tomonori KONDOU
  • Publication number: 20210277507
    Abstract: A method for manufacturing an electric resistance welded steel tube for high-strength thin hollow stabilizers is provided. A steel with a certain chemical composition is heated to a temperature of 1000 to 1300° C., hot rolled under conditions where the rolling finish temperature is 750 to 950° C., cooled, coiled into a coil at 500 to 650° C., and skin pass rolled with a rolling reduction ratio of not less than 0.3%. The resultant hot rolled sheet is electric resistance welded into an electric resistance welded steel tube, which is then reheated to a temperature of 800 to 1100° C. and hot stretch-reducing rolled under conditions where the rolling finish temperature is not more than 850° C. and the cumulative diameter reduction is not more than 75%. Consequently, a thin electric resistance welded steel tube is produced.
    Type: Application
    Filed: October 19, 2017
    Publication date: September 9, 2021
    Applicant: JFE Steel Corporation
    Inventors: Masatoshi Aratani, Shinsaku Kokubo, Hiromichi Hori, Yoshikazu Kawabata, Ryoji Matsui
  • Publication number: 20210268862
    Abstract: An electric resistance welded steel pipe for manufacturing a hollow stabilizer has a Rankford value in a pipe longitudinal direction of from 0.7 to less than 1.0. The electric resistance welded steel pipe is subjected to cold bending and then to a heat treatment including quenching and tempering to manufacture a stabilizer. The cold bending is cold rotary draw bending. When bent with a bend radius of from 1.0 times to 3.0 times an outer diameter of the pipe before cold bending, a flattening ratio is from 0% to 10%, a thickness reduction rate on a bending outside and a thickness increase rate on a bending inside are from 0% to 10%, and additionally, a circumferential length change of a bending center portion is from 0% to 10%. A Vickers hardness of the stabilizer after the heat treatment is adjusted to from 400 HV to less than 580 HV.
    Type: Application
    Filed: April 24, 2019
    Publication date: September 2, 2021
    Applicant: JFE Steel Corporation
    Inventors: Masatoshi Aratani, Ryoji Matsui, Tomonori Kondo, Shinsaku Kokubo
  • Publication number: 20210001425
    Abstract: There are provided an electric resistance welded steel pipe for producing a high strength hollow stabilizer excellent in fatigue resistance and a high strength hollow stabilizer. In an electric resistance welded steel pipe (5) for producing a hollow stabilizer, an internal weld bead cut portion (30) has a three-peak shape and a depth (H) of a trough portion (30a) of the three-peak shape is 0.3 mm or less and an angle (?) formed by a central portion in the circumferential direction of the trough portion (30a) and the top of right and left peak portions (30b, 30c) located on both the right and left sides of the trough portion (30a) is 160° or more and less than 180°.
    Type: Application
    Filed: March 11, 2019
    Publication date: January 7, 2021
    Applicant: JFE Steel Corporation
    Inventors: Masatoshi Aratani, Ryoji Matsui, Hiroshi Nakata, Tomonori Kondo, Hiromichi Hori
  • Patent number: 10787720
    Abstract: An electric resistance welded steel pipe manufactured by performing electric resistance welding on the steel pipe. The steel pipe having a chemical composition including by mass %, C: 0.20% to 0.40%, Si: 0.1% to 1.0%, Mn: 0.1% to 2.0%, Al: 0.01% to 0.10%, Cr: 0.01% to 0.5%, Ti: 0.01% to 0.05%, B: 0.0005% to 0.005%, Ca: 0.0001% to 0.0050%, N: 0.0050% or less, and Fe and inevitable impurities. Additionally, the steel pipe having a microstructure in which each of amounts of TiS particles, having a particle size of 10 ?m or more, and MnS particles, having a particle size of 10 ?m or more, are decreased to 0.1% or less in terms of cleanliness. The steel pipe having excellent fatigue resistance, exhibiting a high strength, and having an average grain size of prior austenite grains of 50 ?m or less when subjected to cold forming followed by quenching and tempering treatments.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: September 29, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Masatoshi Aratani, Kenichi Iwazaki, Shinsaku Kokubo, Yuji Hashimoto
  • Patent number: 10301703
    Abstract: Disclosed is a high-strength welded steel pipe for airbag inflators that has high toughness and workability. A base material portion of the steel pipe has a composition containing, in mass %, C: 0.02 to 0.08%, Si: 0.001 to 1.0%, Mn: 0.1 to 2.0%, P: 0.1% or less, Al: 0.01 to 0.1%, N: 0.01% or less, Ti: 0.01 to 0.20%, and V: 0.01 to 0.50%, with the balance being Fe and incidental impurities. The base material portion has a structure that includes a ferrite phase having an average grain size of 10 ?m or less at an area fraction of 90% or more and a Ti, V-based carbide having an average grain size of 10 nm or less and dispersed in the ferrite phase. The welded steel pipe has a high tensile strength TS of 780 MPa or more and a strength-elongation balance TS×El of 15,000 MPa % or more. The difference ?HV in Vickers hardness between the base material portion and the welded portion is 60 points or less.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: May 28, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Masatoshi Aratani, Yoshikazu Kawabata, Kenichi Iwazaki, Ryoji Matsui
  • Publication number: 20180305780
    Abstract: An electric resistance welded steel pipe manufactured by performing electric resistance welding on the steel pipe. The steel pipe having a chemical composition including by mass %, C: 0.20% to 0.40%, Si: 0.1% to 1.0%, Mn: 0.1% to 2.0%, Al: 0.01% to 0.10%, Cr: 0.01% to 0.5%, Ti: 0.01% to 0.05%, B: 0.0005% to 0.005%, Ca: 0.0001% to 0.0050%, N: 0.0050% or less, and Fe and inevitable impurities. Additionally, the steel pipe having a microstructure in which each of amounts of TiS particles, having a particle size of 10 ?m or more, and MnS particles, having a particle size of 10 ?m or more, are decreased to 0.1% or less in terms of cleanliness. The steel pipe having excellent fatigue resistance, exhibiting a high strength, and having an average grain size of prior austenite grains of 50 ?m or less when subjected to cold forming followed by quenching and tempering treatments.
    Type: Application
    Filed: August 26, 2016
    Publication date: October 25, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Masatoshi ARATANI, Kenichi IWAZAKI, Shinsaku KOKUBO, Yuji HASHIMOTO
  • Publication number: 20180023163
    Abstract: Disclosed is a high-strength welded steel pipe for airbag inflators that has high toughness and workability. A base material portion of the steel pipe has a composition containing, in mass %, C: 0.02 to 0.08%, Si: 0.001 to 1.0%, Mn: 0.1 to 2.0%, P: 0.1% or less, Al: 0.01 to 0.1%, N: 0.01% or less, Ti: 0.01 to 0.20%, and V: 0.01 to 0.50%, with the balance being Fe and incidental impurities. The base material portion has a structure that includes a ferrite phase having an average grain size of 10 ?m or less at an area fraction of 90% or more and a Ti, V-based carbide having an average grain size of 10 nm or less and dispersed in the ferrite phase. The welded steel pipe has a high tensile strength TS of 780 MPa or more and a strength-elongation balance TS×El of 15,000 MPa % or more. The difference ?HV in Vickers hardness between the base material portion and the welded portion is 60 points or less.
    Type: Application
    Filed: October 19, 2015
    Publication date: January 25, 2018
    Applicant: JFE STEEL CORPORATION
    Inventors: Masatoshi Aratani, Yoshikazu Kawabata, Kenichi Iwazaki, Ryoji Matsui
  • Publication number: 20160045974
    Abstract: An open-pipe weld shielding arrangement for an electric resistance welded steel pipe or tube includes a shielding-gas blowing nozzle and a gas flow rate controller. The shielding-gas blowing nozzle includes a gas outlet disposed at a position 5 to 300 mm above upper ends of portions to be welded, and the gas flow rate controller controls the flow rate of the shielding gas blown from the gas outlet to 0.5 to 50 m/sec.
    Type: Application
    Filed: March 18, 2014
    Publication date: February 18, 2016
    Applicant: JFE STEEL CORPORATION
    Inventors: Takatoshi OKABE, Masatoshi ARATANI, Shunsuke TOYODA, Sota GOTO, Hideto KIMURA
  • Publication number: 20150368768
    Abstract: An electric resistance welded steel pipe excellent in terms of fatigue strength. The steel pipe including a chemical composition containing, by mass %, C: 0.35% or more and 0.55% or less, Si: 0.01% or more and 1.0% or less, Mn: 1.0% or more and 3.0% or less, P: 0.02% or less, S: 0.01% or less, Al: 0.005% or less, N: 0.0050% or less, Cr: 0.1% or more and 0.5% or less, and the balance being Fe and inevitable impurities and a metallic microstructure including pearlite, ferrite, and bainite, in which the area ratio of the pearlite is 85% or more, the total of the area ratios (including 0) of the ferrite and the bainite is 15% or less, and in which a prior austenite grain size is 25 ?m or more.
    Type: Application
    Filed: January 30, 2014
    Publication date: December 24, 2015
    Applicant: JFE STEEL CORPORATION
    Inventors: Masatoshi ARATANI, Takatoshi OKABE, Shunsuke TOYODA, Yoshikazu KAWABATA, Hiromichi HORI
  • Publication number: 20150275339
    Abstract: A raw steel tube has a composition containing, by mass, 0.25% to 0.60% carbon, 0.01% to 2.0% silicon, 0.2% to 3.0% manganese, 0.001% to 0.1% aluminum, 0.001% to 0.05% phosphorus, 0.02% or less sulfur, 0.0010% to 0.0100% nitrogen, 0.0003% to 0.0050% boron, and 0.0001% to 0.0050% calcium, the balance being iron and incidental impurities. The raw steel tube is heated to and soaked at an Ac3 transformation point or higher and is then subjected to stretch-reducing rolling at a finishing temperature of rolling of 900° C. to (Ac1 transformation point) with a cumulative reduction in diameter of 30% to 70% within the temperature range of 900° C. or lower.
    Type: Application
    Filed: June 28, 2012
    Publication date: October 1, 2015
    Applicant: JFE Steel Corporation
    Inventors: Masatoshi Aratani, Shunsuke Toyoda, Takatoshi Okabe, Yoshikazu Kawabata, Kenichi Iwazaki
  • Publication number: 20130160889
    Abstract: A high-strength electric resistance welded steel tube has a composition including, in terms of percent by mass, C: 0.05 to 0.20%, Si: 0.5 to 2.0%, Mn: 1.0 to 3.0%, P: 0.1% or less, S: 0.01% or less, Al: 0.01 to 0.1%, N: 0.005% or less, and the balance being Fe and unavoidable impurities; and a structure which is a dual phase structure including a ferrite phase and a martensite phase, with a volume ratio of the martensite phase being 20 to 60%, wherein a tensile strength TS is 1180 MPa or more, an elongation El in a tube axis direction is 10% or more, and a yield ratio is less than 90%; and after application of a 2% prestrain and baking finishing that includes a heat treatment of 170° C.×10 min, a strength increase (BH value) is 100 MPa or more and a yield ratio is 90% or more.
    Type: Application
    Filed: March 23, 2011
    Publication date: June 27, 2013
    Applicant: JFE STEEL CORPORATION
    Inventors: Masatoshi Aratani, Yoshikazu Kawabata, Saiji Matsuoka, Norimasa Hirata
  • Publication number: 20130126036
    Abstract: A base material portion of an electric resistance welded steel pipe has a composition including C at 0.25 to 0.55%, Si at 0.01 to 1.0%, Mn at 0.2 to 3.0%, Al at not more than 0.1% and N at 0.0010 to 0.0100%, with the balance being represented by Fe and inevitable impurities, and the weld defect area, which is a projected area of a weld defect in an electric resistance weld zone, is less than 40000 ?m2.
    Type: Application
    Filed: May 23, 2011
    Publication date: May 23, 2013
    Applicant: JFE STEEL CORPORATION
    Inventors: Masatoshi Aratani, Yoshikazu Kawabata, Takatoshi Okabe, Yukinori Iizuka, Hiromichi Hori, Gunji Makio, Kenichi Iwazaki
  • Patent number: 7887649
    Abstract: A high-tensile strength welded steel tube has excellent formability and torsional fatigue endurance after being formed into cross-sectional shape and then stress-relief annealed. A steel material used has a composition which contains C, Si, Al, 1.01% to 1.99% Mn, 0.041% to 0.150% Ti, 0.017% to 0.150% Nb, P, S, N, and O such that the sum of the content of Ti and that of Nb is 0.08% or more, the content of each of C, Si, and Al being within an appropriate range, the content of each of P, S, N, and O being adjusted to a predetermined value or less.
    Type: Grant
    Filed: June 19, 2007
    Date of Patent: February 15, 2011
    Assignee: JFE Steel Corporation
    Inventors: Shunsuke Toyoda, Masatoshi Aratani, Yoshikazu Kawabata, Yuji Hashimoto, Koji Suzuki, Kei Sakata, Makio Gunji, Akio Sato, Tetsuro Sawaki
  • Publication number: 20090277544
    Abstract: A high-tensile strength welded steel tube has excellent formability and torsional fatigue endurance after being formed into cross-sectional shape and then stress-relief annealed. A steel material used has a composition which contains C, Si, Al, 1.01% to 1.99% Mn, 0.041% to 0.150% Ti, 0.017% to 0.150% Nb, P, S, N, and O such that the sum of the content of Ti and that of Nb is 0.08% or more, the content of each of C, Si, and Al being within an appropriate range, the content of each of P, S, N, and O being adjusted to a predetermined value or less.
    Type: Application
    Filed: June 19, 2007
    Publication date: November 12, 2009
    Applicant: JFE Steel Corporation, a corporation of Japan
    Inventors: Shunsuke Toyoda, Masatoshi Aratani, Yoshikazu Kawabata, Yuji Hashimoto, Koji Suzuki, Kei Sakata, Makio Gunji, Akio Sato, Tetsuro Sawaki
  • Patent number: 7591914
    Abstract: A steel pipe is produced by a method including performing diameter-reducing rolling on a steel pipe in a temperature range of from 600° C. to Ac3 with a reduction in diameter of not less than 30%, preferably after heating the steel pipe to temperatures of not lower than Ac1, the steel pipe being produced by seam-welding strip steel, or a method further including the step of performing heat treatment of holding the rolled steel pipe in a temperature range of from 600° C. to 900° C. for a time of 1 second or longer during cooling subsequent to the diameter-reducing rolling or by reheating the rolled steel pipe after the cooling.
    Type: Grant
    Filed: June 14, 2001
    Date of Patent: September 22, 2009
    Assignee: JFE Steel Corporation
    Inventors: Takaaki Toyooka, Yoshikazu Kawabata, Akira Yorifuji, Masanori Nishimori, Motoaki Itadani, Takatoshi Okabe, Masatoshi Aratani
  • Patent number: 7018488
    Abstract: A steel tube having a composition which contains: 0.05 to 0.30% of C; 1.8 to 4.0% of Mn; Si; and Al is subjected to a diameter-reducing rolling process in which the total diameter-reduction rate is no less than 20% and the temperature at which the diameter-reducing rolling process is finished is no higher than 800° C., whereby a structure constituted of martensite and/or bainite or further of ferrite is obtained as a transformation product from the deformed ?. As a result, a steel tube having tensile strength of 1000 MPa or more and excellent three-point-bending property can be obtained. The composition of the steel tube of the present invention may further include at least one type of element selected from the group consisting of Cu, Ni, Cr and Mo, or at least one type of element selected from the group consisting of Nb, V, Ti and B, or at least of one type selected from the group consisting of REM and Ca.
    Type: Grant
    Filed: June 14, 2001
    Date of Patent: March 28, 2006
    Assignee: JFE Steel Corporation
    Inventors: Takaaki Toyooka, Masanori Nishimori, Yoshikazu Kawabata, Akira Yorifuji, Motoaki Itadani, Takatoshi Okabe, Masatoshi Aratani
  • Patent number: 6949728
    Abstract: An impeder, for manufacturing a welded pipe, including an insulating case 4 containing laminations 10 having coated steel sheets 8 formed by providing an insulating coating on untreated steel sheets having a thickness of 0.3 mm or less and an insulating case 8 containing the laminations, wherein the steel sheets contain 1.5-20% of Cr, 2.5-10% of Si, and 100 ppm or less of C and N in total, or further contain one or more of Al, Mn, and P, where the content of Al is 5% or less and the content of each of Mn and P is 1% or less, the remainder being Fe and unavoidable impurities; and preferably have a resistivity of 60 ??·cm or more.
    Type: Grant
    Filed: August 2, 2001
    Date of Patent: September 27, 2005
    Assignee: JFE Steel Corporation
    Inventors: Takaaki Toyooka, Takatoshi Okabe, Motoaki Itadani, Masatoshi Aratani, Osamu Kondo
  • Publication number: 20040155031
    Abstract: An impeder, for manufacturing a welded pipe, including an insulating case 4 containing laminations 10 having coated steel sheets 8 formed by providing an insulating coating on untreated steel sheets having a thickness of 0.3 mm or less and an insulating case 8 containing the laminations, wherein the steel sheets contain 1.5-20% of Cr, 2.5-10% of Si, and 100 ppm or less of C and N in total, or further contain one or more of Al, Mn, and P, where the content of Al is 5% or less and the content of each of Mn and P is 1% or less, the remainder being Fe and unavoidable impurities; and preferably have a resistivity of 60 &mgr;&OHgr;·cm or more.
    Type: Application
    Filed: November 6, 2003
    Publication date: August 12, 2004
    Inventors: Takaaki Toyooka, Takatoshi Okabe, Motoaki Itadani, Masatoshi Aratani, Osamu Kondo
  • Patent number: 6755919
    Abstract: A stainless steel tube having excellent formability for secondary operation comprises: a chemical composition including not more than 0.20 mass % of C; not more than 1.5 mass % of Si; not more than 2.0 mass % of Mn; 10-18 mass % of Cr; not more than 0.03 mass % of N; or further at least one type of element selected from the group of: not more than 0.6 mass % of Cu; not more than 0.6 mass % of Ni; not more than 2.5 mass % of Mo; not more than 1.0 mass % of Nb; not more than 1.0 mass % of Ti; and not more than 1.0 mass % of V; Fe as the remainder and the inevitable impurities; and a structure constituted of ferrite or ferrite and martensite, wherein the TE value defined by the following formula exceeds 25,000 Mpa·%, TE=TS×(El+21.9) TS represents the tensile strength in the tube axial direction, and El represents the elongation in such direction.
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: June 29, 2004
    Assignee: JFE Steel Corporation
    Inventors: Takaaki Toyooka, Akira Yorifuji, Makoto Kitazawa, Yoshikazu Kawabata, Motoaki Itadani, Masatoshi Aratani, Takatoshi Okabe