Patents by Inventor Junichi Hamada

Junichi Hamada 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).

  • Patent number: 10072323
    Abstract: This hot-rolled ferritic stainless steel sheet has a steel composition containing, in terms of % by mass: 0.02% or less of C; 0.02% or less of N; 0.1% to 1.5% of Si; 1.5% or less of Mn; 0.035% or less of P; 0.010% or less of S; 1.5% or less of Ni; 10% to 20% of Cr; 1.0% to 3.0% of Cu; 0.08% to 0.30% of Ti; and 0.3% or less of Al, with the balance being Fe and unavoidable impurities, and the hot-rolled ferritic stainless steel sheet has a Vickers hardness of less than 235 Hv.
    Type: Grant
    Filed: October 2, 2015
    Date of Patent: September 11, 2018
    Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Shinichi Teraoka, Masaaki Kobayashi, Yuuji Koyama, Junichi Hamada, Norihiro Kanno, Yoshiharu Inoue, Ken Kimura, Jun Takahashi, Shigeyuki Gotoh
  • Publication number: 20180080106
    Abstract: A stainless steel sheet free of surface flaws, having an enhanced high temperature strength and corrosion resistance, not becoming brittle at a high temperature, and further exhibiting a high oxidation resistance enabling it to be suitably used as an inside pipe of a double pipe of an exhaust manifold, a turbocharger part, and other automobile exhaust system parts, which stainless steel sheet has a predetermined composition of chemical components and satisfies Cr+20Mo?24.0%, and Si+20C+15N?5.8%. Further, an automobile exhaust system part, excellent in both the oxidation resistances of the base material and weld zone using the above stainless steel sheet, having a gradient of change of sheet thickness between the weld metal and the base material of the above stainless steel sheet of 15 degrees or less.
    Type: Application
    Filed: March 29, 2016
    Publication date: March 22, 2018
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Shinichi TERAOKA, Yoshiharu INOUE, Junichi HAMADA, Atsuhisa YAKAWA
  • Publication number: 20180066335
    Abstract: Ferritic stainless steel sheet which is excellent in ridging resistance which comprises, by mass %, Cr: 10 to 30%, Sn: 0.005 to 1%, C: 0.001 to 0.1%, N: 0.001 to 0.1%, Si: 0.01 to 3.0%, Mn: 0.01 to 3.0%, P: 0.005 to 0.1%, and S: 0.0001 to 0.01% and has a balance of Fe and unavoidable impurities and which has an X-ray diffraction strength in the {100}<012> orientation from a surface layer to t/4 (“t” is sheet thickness) of 2 or more.
    Type: Application
    Filed: November 13, 2017
    Publication date: March 8, 2018
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Junichi HAMADA, Eiichiro ISHIMARU
  • Publication number: 20180056370
    Abstract: A method of increasing the thickness of a tube which increases a thickness of an end part of a tube without a burr being formed, comprising placing a tube 21 between a die 25 and mandrel 22 in the state with a space for increasing the thickness between a small diameter part 22a of the mandrel 22 and a first end part 21a of a tube 21 and between a large diameter hole part 25C of the die 25 and a second end part 21b of the tube 21, using a first upsetting punch 23 and a second upsetting punch 24 to respectively process the first end part 21a and the second end part 21b of the tube 21, pulling out the mandrel 22 from the tube 31 in the state with the second upsetting punch 24 constraining the second end part 31b of the tube 31, and using the first upsetting punch 23 to push up the first end part 31a of the tube 31 to take out the tube 31 from the die 25.
    Type: Application
    Filed: March 8, 2016
    Publication date: March 1, 2018
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Shuji YAMAMOTO, Junichi HAMADA, Atsuhisa YAKAWA, Mitsuhiro FUJINAGA
  • Publication number: 20180044767
    Abstract: To provide a ferritic stainless steel sheet which has high scale spalling even at a high temperature around 1000° C. Provided is a ferritic stainless steel sheet having excellent Mn-containing oxide film-forming ability and scale spalling ability, containing, in terms of mass %: C: 0.001 to 0.020%, N: 0.001 to 0.020%, Si: 0.10 to 0.40%, Mn: 0.20 to 1.00%, Cr: 16.0 to 20.0%, Nb: 0.30 to 0.80%, Mo: 1.80 to 2.40%, W: 0.05 to 1.40%, Cu: 1.00 to 2.50%, and B: 0.0003 to 0.0030%, in which the above-mentioned components are contained satisfying the formula (1) below, and the balance is composed of Fe and inevitable impurities. At least one of N, Al, V, Mg, Sn, Co, Zr, Hf, and Ta may be added in a predetermined content range.
    Type: Application
    Filed: October 6, 2017
    Publication date: February 15, 2018
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Norihiro KANNO, Junichi HAMADA, Yoshiharu INOUE
  • Patent number: 9885099
    Abstract: To provide a ferritic stainless steel sheet which has high scale spalling even at a high temperature around 1000° C. Provided is a ferritic stainless steel sheet having excellent Mn-containing oxide film-forming ability and scale spalling ability, containing, in terms of mass %: C: 0.001 to 0.020%, N: 0.001 to 0.020%, Si: 0.10 to 0.40%, Mn: 0.20 to 1.00%, Cr: 16.0 to 20.0%, Nb: 0.30 to 0.80%, Mo: 1.80 to 2.40%, W: 0.05 to 1.40%, Cu: 1.00 to 2.50%, and B: 0.0003 to 0.0030%, in which the above-mentioned components are contained satisfying the formula (1) below, and the balance is composed of Fe and inevitable impurities. At least one of N, Al, V, Mg, Sn, Co, Zr, Hf, and Ta may be added in a predetermined content range.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: February 6, 2018
    Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Norihiro Kanno, Junichi Hamada, Yoshiharu Inoue
  • Publication number: 20170314093
    Abstract: A ferritic stainless steel sheet and a steel pipe as a material suitable for a heat-resistant component that is required to have especially excellent formability are provided. The ferritic stainless steel sheet contains 10 to 20 mass % of Cr and a predetermined amount of C, Si, Mn, P, S, Al and one or both of Ti and Nb, a {111}-orientation intensity being 5 or more and {411}-orientation intensity being less than 3 at a portion in the vicinity of a sheet-thickness central portion of the ferritic stainless steel sheet. Further, with similar composition and by setting {111}<110>-orientation intensity at 4.0 or more and {311}<136>-orientation intensity at less than 3.0, a relationship rm??1.0t+3.0 (t (mm): sheet thickness, rm: average r-value) is satisfied, thereby providing a ferritic stainless steel sheet and a steel pipe with excellent formability.
    Type: Application
    Filed: October 27, 2015
    Publication date: November 2, 2017
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Junichi HAMADA, Kou NISHIMURA, Jun ARAKI, Nozomu FUKUDA, Toshio TANOUE
  • Publication number: 20170275723
    Abstract: This ferritic stainless steel contains, by mass %, C: 0.001% to 0.030%; Si: 0.01% to 1.00%, Mn: 0.01% to 2.00%, P: 0.050% or less, S: 0.0100% or less, Cr: 11.0% to 30.0%, Mo: 0.01% to 3.00%, Ti: 0.001% to 0.050%, Al: 0.001% to 0.030%, Nb: 0.010% to 1.000%, and N: 0.050% or less, with a remainder being Fe and inevitable impurities, wherein an amount of Al, an amount of Ti, and an amount of Si (mass %) satisfy Al/Ti?8.4Si?0.78.
    Type: Application
    Filed: October 30, 2015
    Publication date: September 28, 2017
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Masatoshi ABE, Junichi HAMADA, Nobuhiko HIRAIDE, Norihiro KANNO, Shigeo FUKUMOTO, Shigeru KANEKO, Atsutaka HAYASHI
  • Publication number: 20170253945
    Abstract: A martensitic stainless steel used for a brake disk of a two-wheeled vehicle includes: in % by mass, C of 0.025% to 0.080%, Si of 0.05% to 0.8%, Mn of 0.5% to 1.5%, P of 0.035% or less, S of 0.015% or less, Cr of 11.0% to 13.5%, Ni of 0.01% to 0.50%, Cu of 0.01% to 0.08%, Mo of 0.01% to 0.30%, V of 0.01% to 0.10%, Al of 0.05% or less, and N of 0.015% to 0.060%; a DFE value defined by a formula (1) ranging from 5 to 30; and a ? ferrite fraction observed in a cross section structure ranging from 5% to 30% by an area ratio. Ti, B, Nb, Sn and Bi may be added.
    Type: Application
    Filed: September 2, 2015
    Publication date: September 7, 2017
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Shinichi TERAOKA, Yoshiharu INOUE, Yuji KOYAMA, Junichi HAMADA, Toshio TANOUE
  • Patent number: 9714459
    Abstract: The present invention is directed to a heat-resistant austenitic stainless steel sheet comprising, by mass %, C: 0.03% to 0.06%, N: 0.1% to 0.3%, Si: 1% or less Mn: 3% or less, P: 0.04% or less, S: 0.03% or less, Ni: 5 to 12%, Cr: 15 to 20%, Al: 0.01% to 0.1%, Nb: 0.05% to 0.3%, V: 0.05% to 0.30%, Ti: 0.03% or less, (Nb+V)/(C+N): 2 or less and further a balance of Fe and unavoidable impurities, and wherein an amount of precipitates mainly comprised of carbonitrides is 1% or less.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: July 25, 2017
    Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Yoshiharu Inoue, Fumio Fudanoki, Junichi Hamada
  • Patent number: 9639021
    Abstract: The image forming system having an image forming apparatus and a charge adjusting apparatus has a decision unit that decides an amount of charge to be applied to a recording sheet from coverages of toner images of both surfaces of the recording sheet, the image forming apparatus has a fixing unit that heats and presses a recording sheet to which a toner image is transferred, thereby fixing the toner image to the recording sheet, and the charge adjusting apparatus has a voltage applying unit that applies a voltage to the recording sheet to which the toner image is fixed by the fixing unit, thereby applying charge with the amount decided by the decision unit to the recording sheet.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: May 2, 2017
    Assignee: KONICA MINOLTA, INC.
    Inventors: Sachie Matsudaira, Satoshi Nishida, Junichi Hamada
  • Publication number: 20170107593
    Abstract: The present invention provides a rolled ferritic stainless steel material excellent in corrosion resistance and toughness, in particular suitable as a material for a flange and a method for producing the same and flange part. The rolled ferritic stainless steel material contains, by mass %, C: 0.001 to 0.08%, Si: 0.01 to 1.0%, Mn: 0.01 to 1.0%, P: 0.01 to 0.05%, S: 0.0002 to 0.01%, Cr: 10.0 to 25.0%, and N: 0.001 to 0.05%, has a balance of Fe and unavoidable impurities, has a thickness of 5 mm or more, and has an area ratio of crystal grains with a <011> direction within 15° from the rolling direction of 20% or more in a cross-section parallel to the rolling direction at any location between the left and right ends of the steel sheet.
    Type: Application
    Filed: March 26, 2015
    Publication date: April 20, 2017
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Junichi HAMADA, Koji ITO
  • Patent number: 9399809
    Abstract: This hot-rolled ferritic stainless steel sheet has a steel composition containing, in terms of % by mass: 0.02% or less of C; 0.02% or less of N; 0.1% to 1.5% of Si; 1.5% or less of Mn; 0.035% or less of P; 0.010% or less of S; 1.5% or less of Ni; 10% to 20% of Cr; 1.0% to 3.0% of Cu; 0.08% to 0.30% of Ti; and 0.3% or less of Al, with the balance being Fe and unavoidable impurities, and the hot-rolled ferritic stainless steel sheet has a Vickers hardness of less than 235 Hv.
    Type: Grant
    Filed: February 8, 2012
    Date of Patent: July 26, 2016
    Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Shinichi Teraoka, Masaaki Kobayashi, Yuuji Koyama, Junichi Hamada, Norihiro Kanno, Yoshiharu Inoue, Ken Kimura, Jun Takahashi, Shigeyuki Gotoh
  • Publication number: 20160187803
    Abstract: The image forming system having an image forming apparatus and a charge adjusting apparatus has a decision unit that decides an amount of charge to be applied to a recording sheet from coverages of toner images of both surfaces of the recording sheet, the image forming apparatus has a fixing unit that heats and presses a recording sheet to which a toner image is transferred, thereby fixing the toner image to the recording sheet, and the charge adjusting apparatus has a voltage applying unit that applies a voltage to the recording sheet to which the toner image is fixed by the fixing unit, thereby applying charge with the amount decided by the decision unit to the recording sheet.
    Type: Application
    Filed: December 28, 2015
    Publication date: June 30, 2016
    Inventors: Sachie MATSUDAIRA, Satoshi NISHIDA, Junichi HAMADA
  • Publication number: 20160097114
    Abstract: A heat-resistant cold rolled ferritic stainless steel sheet containing, in mass %, 0.02% or less of C, 0.1% to 1.0% of Si, greater than 0.6% to 1.5% of Mn, 0.01% to 0.05% of P, 0.0001% to 0.0100% of S, 13.0% to 20.0% of Cr, 0.1% to 3.0% of Mo, 0.005% to 0.20% of Ti, 0.3% to 1.0% of Nb, 0.0002% to 0.0050% of B, 0.005% to 0.50% of Al, 0.02% or less of N, with the balance being Fe and inevitable impurities, in which {111}-oriented grains are present at an area ratio of 20% or greater in a region from a surface layer to t/4 (t is a sheet thickness), {111}-oriented grains are present at an area ratio of 40% or greater in a region from t/4 to t/2, and {011}-oriented grains are present at an area ratio of 15% or less in the entire region in a thickness direction.
    Type: Application
    Filed: December 15, 2015
    Publication date: April 7, 2016
    Applicant: Nippon Steel & Sumikin Stainless Steel Corporation
    Inventors: Junichi HAMADA, Yuji KOYAMA, Yoshiharu INOUE, Tadashi KOMORI, Fumio FUDANOKI, Toshio TANOUE, Naoto ONO
  • Publication number: 20160024627
    Abstract: This hot-rolled ferritic stainless steel sheet has a steel composition containing, in terms of % by mass: 0.02% or less of C; 0.02% or less of N; 0.1% to 1.5% of Si; 1.5% or less of Mn; 0.035% or less of P; 0.010% or less of S; 1.5% or less of Ni; 10% to 20% of Cr; 1.0% to 3.0% of Cu; 0.08% to 0.30% of Ti; and 0.3% or less of Al, with the balance being Fe and unavoidable impurities, and the hot-rolled ferritic stainless steel sheet has a Vickers hardness of less than 235 Hv.
    Type: Application
    Filed: October 2, 2015
    Publication date: January 28, 2016
    Inventors: Shinichi TERAOKA, Masaaki KOBAYASHI, Yuuji KOYAMA, Junichi HAMADA, Norihiro KANNO, Yoshiharu INOUE, Ken KIMURA, Jun TAKAHASHI, Shigeyuki GOTOH
  • Patent number: 9243306
    Abstract: Ferritic stainless steel sheet which has a high oxidation resistance and scale spallation resistance even at a high temperature near 1000° C., characterized by containing C: 0.020% or less, N: 0.020% or less, Si: over 0.10 to 0.35%, Mn: 0.10 to 0.60%, Cr: 16.5 to 20.0%, Nb: 0.30 to 0.80%, Mo: over 2.50 to 3.50%, and Cu: 1.00 to 2.50%, having an amount of increase of oxidation after a continuous oxidation test in the air at 1000° C. for 200 hours of 4.0 mg/cm2 or less, and having an amount of scale spallation of 1.0 mg/cm2 or less.
    Type: Grant
    Filed: March 11, 2011
    Date of Patent: January 26, 2016
    Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Norihiro Kanno, Yoshiharu Inoue, Junichi Hamada
  • Publication number: 20160017451
    Abstract: A ferritic stainless steel sheet exhibiting small increase in strength after aging heat treatment in the present invention contains, by mass %, C: 0.020% or less, Cr: 10.0% to 25.0%, N: 0.020% or less, Sn: 0.010% to 0.50%, and one or more of Ti: 0.60% or less, Nb: 0.60% or less, V: 0.60% or less, and Zr: 0.60% or less so as to satisfy the following Equation (1), in which the difference between stress ?1 (N/mm2) after prestrain imparting tensile deformation with 7.5% of strain, and upper yield stress ?2 (N/mm2) when the steel sheet is subjected to heat treatment at 200° C. for 30 minutes and then to tension again after the tensile deformation is 8 or less. (Ti/48+V/51+Zr/91+Nb/93)/(C/12+N/14)?1.
    Type: Application
    Filed: March 14, 2014
    Publication date: January 21, 2016
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Ken KIMURA, Junichi HAMADA, Eiichiro ISHIMARU, Akihito YAMAGISHI, Naoto HANSAKI
  • Publication number: 20150376733
    Abstract: This ferritic stainless steel sheet contains, in terms of % by mass, 0.02% or less of C, 0.02% or less of N, 0.10% to 0.60% of Si, 0.10% to 0.80% of Mn, 15.0% to 21.0% of Cr, more than 2.00% to 3.50% or less of Cu, 0.30% to 0.80% of Nb, 1.00% to 2.50% of Mo, and 0.0003% to 0.0030% of B, with a remainder being Fe and unavoidable impurities, wherein a maximum particle size of ?-Cu that is present in a structure is 20 nm to 200 nm.
    Type: Application
    Filed: March 6, 2014
    Publication date: December 31, 2015
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Norihiro KANNO, Junichi HAMADA, Yoshiharu INOUE
  • Publication number: 20150376732
    Abstract: Ferritic stainless steel sheet which is excellent in ridging resistance which comprises, by mass %, Cr: 10 to 30%, Sn: 0.005 to 1%, C: 0.001 to 0.1%, N: 0.001 to 0.1%, Si: 0.01 to 3.0%, Mn: 0.01 to 3.0%, P: 0.005 to 0.1%, and S: 0.0001 to 0.01% and has a balance of Fe and unavoidable impurities and which has an X-ray diffraction strength in the {100}<012> orientation from a surface layer to t/4 (“t” is sheet thickness) of 2 or more.
    Type: Application
    Filed: February 4, 2014
    Publication date: December 31, 2015
    Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Junichi HAMADA, Eiichiro ISHIMARU