Patents by Inventor Masafumi Zeze

Masafumi Zeze 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: 10337092
    Abstract: A steel sheet according to the present invention includes a predetermined chemical composition, in which amounts of each elements by mass % in the chemical composition satisfy both of expression “0.3000?{Ca/40.88+(REM/140)/2}/(S/32.07)” and expression “Ca?0.0058?0.0050×C”, and a number density of carbonitrides including Ti which exists independently and has a long side of 5 ?m or more is limited to 5 pieces/mm2 or less.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: July 2, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takashi Morohoshi, Takashi Aramaki, Masafumi Zeze
  • Publication number: 20160076123
    Abstract: A steel sheet according to the present invention includes a predetermined chemical composition, in which amounts of each elements by mass % in the chemical composition satisfy both of expression “0.3000?{Ca/40.88+(REM/140)/2}/(S/32.07)” and expression “Ca?0.0058?0.0050×C”, and a number density of carbonitrides including Ti which exists independently and has a long side of 5 ?m or more is limited to 5 pieces/mm2 or less.
    Type: Application
    Filed: April 24, 2014
    Publication date: March 17, 2016
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takashi MOROHOSHI, Takashi ARAMAKI, Masafumi ZEZE
  • Patent number: 9051634
    Abstract: Disclosed is a steel sheet in which the amounts of respective elements in chemical components, which are represented by mass %, satisfy the following Expression 1 and Expression 2. In addition, the steel contains Ti-included-carbonitrides as inclusions, and the number density of the Ti-included-carbonitrides having a long side of 5 ?m or more is 3 pieces/mm2 or less. 0.3?{Ca/40.88+(REM/140)/2}/(S/32.07)??(Expression 1) Ca?0.005?0.0035×C??(Expression 2).
    Type: Grant
    Filed: June 28, 2012
    Date of Patent: June 9, 2015
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takashi Morohoshi, Takashi Aramaki, Masafumi Zeze
  • Publication number: 20140241934
    Abstract: Disclosed is a steel sheet in which the amounts of respective elements in chemical components, which are represented by mass %, satisfy the following Expression 1 and Expression 2. In addition, the steel contains Ti-included-carbonitrides as inclusions, and the number density of the Ti-included-carbonitrides having a long side of 5 ?m or more is 3 pieces/mm2 or less. 0.3?{Ca/40.88+(REM/140)/2}/(S/32.07)??(Expression 1) Ca?0.005?0.
    Type: Application
    Filed: June 28, 2012
    Publication date: August 28, 2014
    Inventors: Takashi Morohoshi, Takashi Aramaki, Masafumi Zeze
  • Patent number: 6918969
    Abstract: A cast steel with excellent workability, characterized in that not less than 60% of the total cross section thereof is occupied by equiaxed crystals, the diameters (mm) of which satisfy the following formula: D<1.2X1/3+0.75, wherein D designates each diameter (mm) of equiaxed crystals in terms of internal structure in which the crystal orientations are identical, and X the distance (mm) from the surface of the cast steel. The cast steel and the steel material obtained by processing the cast steel have very few surface flaws and internal defects.
    Type: Grant
    Filed: August 16, 2002
    Date of Patent: July 19, 2005
    Assignee: Nippon Steel Corporation
    Inventors: Masafumi Zeze, Takashi Morohoshi, Ryusuke Miura, Shintaro Kusunoki, Yasuhiro Kinari, Masayuki Abe, Hiroshi Sugano, Kenichiro Miyamoto, Masaharu Oka, Yuji Koyama
  • Patent number: 6585799
    Abstract: A cast steel with excellent workability, characterized in that not less than 60% of the total cross section thereof is occupied by equiaxed crystals, the diameters (mm) of which satisfy the following formula: D<1.2X1/3+0.75, wherein D designates each diameter (mm) of equiaxed crystals in terms of internal structure in which the crystal orientations are identical, and X the distance (mm) from the surface of the cast steel. The cast steel and the steel material obtained by processing the cast steel have very few surface flaws and internal defects.
    Type: Grant
    Filed: December 7, 2000
    Date of Patent: July 1, 2003
    Assignee: Nippon Steel Corporation
    Inventors: Masafumi Zeze, Takashi Morohoshi, Ryusuke Miura, Shintaro Kusunoki, Yasuhiro Kinari, Masayuki Abe, Hiroshi Sugano, Kenichiro Miyamoto, Masaharu Oka, Yuji Koyama
  • Publication number: 20030015260
    Abstract: A cast steel with excellent workability, characterized in that not less than 60% of the total cross section thereof is occupied by equiaxed crystals, the diameters (mm) of which satisfy the following formula:
    Type: Application
    Filed: August 16, 2002
    Publication date: January 23, 2003
    Applicant: Nippon Steel Corporation
    Inventors: Masafumi Zeze, Takashi Morohoshi, Ryusuke Miura, Shintaro Kusunoki, Yasuhiro Kinari, Masayuki Abe, Hiroshi Sugano, Kenichiro Miyamoto, Masaharu Oka, Yuji Koyama
  • Patent number: 6478892
    Abstract: The present invention provides a non-oriented electrical steel sheet having crystal grains of small diameter and excellent workability before stress relief annealing and having crystal grains of largely grown diameter and excellent iron loss property after stress relief annealing and a method for producing the same, and relates to a low iron loss non-oriented electrical steel sheet excellent in workability, containing, in weight %, 0.010% or less of C, 0.1 to 1.5% of Mn, 0.1 to 4% of Si, 0.1 to 4% of Al, wherein the latter three elements satisfy the formula Si+Mn+Al≦5.0%, and 0.0005 to 0.0200% of Mg, or further containing 0.005% or more of Ca, wherein the total amount of Mg and Ca is 0.0200% or less, or further containing 0.005% or more of REM, wherein the total amount of Mg and REM is 0.0200% or less, or further containing 0.005% or more of Ca and REM, wherein the total amount of Mg, Ca and REM is 0.0200% or less, and containing the remainder consisting of Fe and unavoidable impurities.
    Type: Grant
    Filed: April 6, 2001
    Date of Patent: November 12, 2002
    Assignee: Nippon Steel Corporation
    Inventors: Ken-ichi Murakami, Takashi Morohoshi, Tomoji Kumano, Ryutaro Kawamata, Takeshi Kubota, Masafumi Zeze, Hidekuni Murakami, Shinichi Kanao
  • Publication number: 20010037841
    Abstract: The present invention provides a non-oriented electrical steel sheet having crystal grains of small diameter and excellent workability before stress relief annealing and having crystal grains of largely grown diameter and excellent iron loss property after stress relief annealing and a method for producing the same, and relates to a low iron loss non-oriented electrical steel sheet excellent in workability, containing, in weight %, 0.010% or less of C, 0.1 to 1.5% of Mn, 0.1 to 4% of Si, 0.1 to 4% of Al, wherein the latter three elements satisfy the formula Si+Mn+Al≦5.0%, and 0.0005 to 0.0200% of Mg, or further containing 0.005% or more of Ca, wherein the total amount of Mg and Ca is 0.0200% or less, or further containing 0.005% or more of REM, wherein the total amount of Mg and REM is 0.0200% or less, or further containing 0.005% or more of Ca and REM, wherein the total amount of Mg, Ca and REM is 0.0200% or less, and containing the remainder consisting of Fe and unavoidable impurities.
    Type: Application
    Filed: April 6, 2001
    Publication date: November 8, 2001
    Inventors: Ken-ichi Murakami, Takashi Morohoshi, Tomoji Kumano, Ryutaro Kawamata, Takeshi Kubota, Masafumi Zeze, Hidekuni Murakami, Shinichi Kanao
  • Patent number: 5269366
    Abstract: Two kinds of molten steels are poured into a continuous casting mold. Direct current magnetic flux is applied which direct current magnetic flux extends in a direction transverse to the thickness (corresponding to the thickness of a casting slab) of the poured content at a position of a certain height of the mold. The molten steels are supplied above and below a boundary of static magnetic fields formed by the direct current magnetic flux longitudinally or in a casting direction. When a difference (.DELTA..rho.) between a density .rho..sub.1 of the molten steel for an outer layer supplied above the static magnetic fields and a density .rho..sub.2 of the molten steel for an inner layer supplied below the static magnetic fields, is expressed by .DELTA..rho.=.rho..sub.1 -.rho..sub.2 (g/cm.sup.3), a density (tesla) of the direct current magnetic flux is determined by the following formula:a) in case of .DELTA..rho.<0B.gtoreq.[2.83.times.(.DELTA..rho.).sup.2 +1.68.times..DELTA..rho.+0.30]b) in case of 0.ltoreq.
    Type: Grant
    Filed: December 9, 1992
    Date of Patent: December 14, 1993
    Assignee: Nippon Steel Corporation
    Inventors: Masafumi Zeze, Takashi Sawai, Eiichi Takeuchi
  • Patent number: 5083604
    Abstract: A method for improving the internal center segregation and center porosity of a continuously cast slab, wherein an unsolidified side edge portion and a given area at the upstream side of the cast slab during continuous casting are defined as a plane reducing zone; a holding means is provided having two sets of top and bottom walking plane reducing compressing means at the plane reducing zone, front and rear supporting shafts common to the sets, eccentric cams for each set arranged at the front and the rear supporting shafts for holding and releasing of the cast slab, and a front and a rear displacement mechanism; the cast slab holding position of the upper surface of the bottom side walking plane reducing means of each set is set within 0.5 mm of the deviation on a passline of a continuous casting machine; the cast slab holding position of the lower surface of the top walking plane reducing means of each set is set at a desired reduction taper having a plane reduction ratio of 0.5 to 5.
    Type: Grant
    Filed: May 15, 1991
    Date of Patent: January 28, 1992
    Assignee: Nippon Steel Corporation
    Inventors: Masafumi Zeze, Hideyuki Misumi, Tokinari Shirai, Takashi Nishihara