Patents by Inventor Tatsuhiko Hiratani
Tatsuhiko Hiratani 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).
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Publication number: 20150013850Abstract: An electrical steel sheet has a composition including C: less than 0.010 mass %, Si: 1.5˜10 mass % and the balance being Fe and incidental impurities, wherein a main orientation in a texture of a steel sheet is <111>//ND and an intensity ratio relative to randomly oriented specimen of the main orientation is not less than 5 and, preferably an intensity ratio relative to randomly oriented specimen of {111}<112> orientation is not less than 10, an intensity ratio relative to randomly oriented specimen of {310}<001> orientation is not more than 3 and Si concentration has a gradient that it is high at a side of a surface layer and low at a central portion in the thickness direction and a maximum value of the Si concentration is not less than 5.5 mass % and a difference between maximum and minimum values is not less than 0.5 mass %.Type: ApplicationFiled: January 22, 2013Publication date: January 15, 2015Inventors: Takeshi Imamura, Minoru Takashima, Tatsuhiko Hiratani
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Patent number: 8916268Abstract: An iron powder for dust cores is provided which can be formed into a dust core having a high resistivity and having a low iron loss without degrading the mechanical strength. The iron powder for dust cores includes an iron powder and an oxide film on the surface thereof, wherein the oxide film is composed of a Si-based oxide in which the ratio of Si to Fe satisfies Si/Fe?0.8 on an atomic number basis.Type: GrantFiled: December 11, 2008Date of Patent: December 23, 2014Assignees: JFE Steel Corporation, Toyota Jidosha Kabushiki KaishaInventors: Takashi Kawano, Noriko Makiishi, Tatsuhiko Hiratani, Naomichi Nakamura, Yusuke Oishi, Eisuke Hoshina, Toshiya Yamaguchi, Daisuke Okamoto, Takeshi Hattori
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Publication number: 20140255720Abstract: An electrical steel sheet has a component composition including, by mass %, C: 0.007% or less, Si: 4% to 10%, and Mn: 0.005% to 1.0%, the balance being Fe and incidental impurities, as well as a sheet thickness within a range of 0.01 mm or more to 0.10 mm or less, and a profile roughness. Pa of 1.0 ?m or less. The electrical steel sheet exhibits excellent iron loss properties whereby the magnetic property is free from deterioration, and degradation of the stacking factor can be avoided, even when the steel sheet with a thickness of 0.10 mm or less has been subjected to siliconizing treatment to increase the Si content in the steel.Type: ApplicationFiled: November 6, 2012Publication date: September 11, 2014Applicant: JFE Steel CorporationInventors: Takeshi Imamura, Minoru Takashima, Tatsuhiko Hiratani
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Publication number: 20100239879Abstract: Since a surface of an iron powder is covered with an oxide film composed of a Si-based oxide in which the ratio of Si to Fe satisfies Si/Fe?0.8 on an atomic number basis, an iron powder for dust cores is provided which can be formed into a dust core having a high resistivity and hence having a low iron loss without degrading the mechanical strength.Type: ApplicationFiled: December 11, 2008Publication date: September 23, 2010Applicants: JFE STEEL CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Takashi Kawano, Noriko Makiishi, Tatsuhiko Hiratani, Naomichi Nakamura, Yusuke Oishi, Eisuke Hoshina, Toshiya Yamaguchi, Daisuke Okamoto, Takeshi Hattori
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Publication number: 20100150768Abstract: A pure iron powder of a diameter of 10 to 500 ?m and a purity of 99% by mass or more is heated to a temperature in the range of 600 to 1400° C., and a Si-concentrated layer is formed in regions within a depth of 5 ?m from the surfaces of the powder particles by gas-phase reaction at a temperature of that range. The average Si concentration in the regions within this depth is controlled in the range of 0.05% to 2% by mass. Thus, a dust core metal powder enhancing the adhesion of insulating material to the particle without degrading compressibility is produced. The resulting dust core maintains a high saturation magnetic flux density and exhibits a low iron loss.Type: ApplicationFiled: May 26, 2008Publication date: June 17, 2010Applicant: JFE STEEL CORPORATIONInventors: Akira Fujita, Tatsuhiko Hiratani, Toshio Maetani
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Patent number: 7163592Abstract: A steel sheet for a tension mask excellent in the shielding properties from geomagnetism consists essentially of lower than 0.1% by weight of C, lower than 0.2% by weight of Si, 0.4 to 2% by weight of Mn, not higher than 0.1% by weight of P, not higher than 0.03% by weight of S, not higher than 0.01% by weight of sol. Al, 0.003 to 0.02% by weight of N and the balance of Fe, and has an anhysteretic magnetic permeability of 5,000 or higher.Type: GrantFiled: July 2, 2003Date of Patent: January 16, 2007Assignee: JFE Steel CorporationInventors: Hideki Matsuoka, Yasushi Tanaka, Reiko Sugihara, Tatsuhiko Hiratani, Kenichiro Takayanagi, Masamichi Okada, Hiroaki Kato
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Patent number: 7056599Abstract: A steel sheet for a magnetic shield comprising less than 0.005% by weight of C and 0.0003 to 0.01% by weight of B, and having a thickness of 0.05 to 0.5 mm and an anhysteresis magnetic permeability of 7500 or more.Type: GrantFiled: July 8, 2003Date of Patent: June 6, 2006Assignees: JFE Steel Corporation, Sony CorporationInventors: Reiko Sugihara, Tatsuhiko Hiratani, Hideki Matsuoka, Yasushi Tanaka, Satoshi Kodama, Kenji Tahara, Yasuyuki Takada, Ken-ichi Mitsuzuka
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Publication number: 20050167006Abstract: A steel sheet for an explosion-proof band contains 0.001 to 0.05% by mass of C, 0.2 to 1% by mass of Si, 0.5 to 2.3% by mass of Mn, 0.02 to 0.12% by mass of P, not higher than 0.005% by mass of 0, not higher than 0.020% by mass of S, and not higher than 0.005% by mass of N, and has not higher than 100% of a P segregation rate within the steel sheet, which is represented by (Pmax?Pave)×100/Pave, where Pmax denotes the maximum P concentration within the steel sheet, and Pave denotes the average P concentration within the steel sheet, 10 to 25 ?m of an average ferrite grain size, and not lower than 10,000 of an anhysteretic magnetic permeability.Type: ApplicationFiled: December 25, 2003Publication date: August 4, 2005Applicants: JFE STEEL CORPORATION, Sony CorporationInventors: Nobuko Mineji, Tadashi Inoue, Tatsuhiko Hiratani, Kenji Tahara, Noritaka Takahashi, Hiroaki Kato, Teruo Takeuchi, Kenichiro Takayanagi, Chohachi Sato, Masamichi Okada
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Publication number: 20040007290Abstract: A steel sheet for a magnetic shield comprising less than 0.005 % by weight of C and 0.0003 to 0.01 % by weight of B, and having a thickness of 0.05 to 0.5 mm and an anhysteresis magnetic permeability of 7500 or more.Type: ApplicationFiled: July 8, 2003Publication date: January 15, 2004Applicants: NKK CORPORATION, SONY CORPORATIONInventors: Reiko Sugihara, Tatsuhiko Hiratani, Hideki Matsuoka, Yasushi Tanaka, Satoshi Kodama, Kenji Tahara, Yasuyuki Takada, Ken-Ichi Mitsuzuka
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Publication number: 20040003868Abstract: A steel sheet for a tension mask excellent in the shielding properties from geomagnetism consists essentially of lower than 0.1% by weight of C, lower than 0.2% by weight of Si, 0.4 to 2% by weight of Mn, not higher than 0.1% by weight of P, not higher than 0.03% by weight of S, not higher than 0.01% by weight of sol. Al, 0.003 to 0.02% by weight of N and the balance of Fe, and has an anhysteretic magnetic permeability of 5,000 or higher.Type: ApplicationFiled: July 2, 2003Publication date: January 8, 2004Applicants: NKK CORPORAITON, SONY CORPORATIONInventors: Hideki Matsuoka, Yasushi Tanaka, Reiko Sugihara, Tatsuhiko Hiratani, Kenichiro Takayanagi, Masamichi Okada, Hiroaki Kato
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Patent number: 6635361Abstract: A steel sheet for magnetic shields is provided containing 0.15% by weight or less of C and having a thickness of 0.05-0.5 mm and an anhysteretic magnetic permeability of 7500 or higher.Type: GrantFiled: March 26, 2001Date of Patent: October 21, 2003Assignees: NKK Corporation, Sony CorporationInventors: Reiko Sugihara, Tatsuhiko Hiratani, Hideki Matsuoka, Yasushi Tanaka, Satoshi Kodama, Kenji Tahara, Yasuyuki Takada, Ken-ichi Mitsuzuka
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Patent number: 6566796Abstract: A method of making a steel sheet for a tension mask, including the steps of: hot rolling a steel consisting essentially of, by weight %, C: less than 0.1%, Si: 0.05% or less, Mn: 0.4 to 2%, P: 0.03% or less, S: 0.03% or less, sol.Al: 0.01% or less, N: 0.010% or more, and the balance of Fe; and annealing the cold rolled steel sheet, followed by a secondary cold rolling at a reduction rate of 35% or higher. The steel sheet produced by this method shows excellent creep resistance during blackening treatment and excellent magnetic shielding property with an anhysteretic permeability of 3400 or more at a DC bias magnetic field of 0.35 Oe, and therefore causes no color-deviation when applied to the tension mask.Type: GrantFiled: August 14, 2001Date of Patent: May 20, 2003Assignees: NKK Corporation, Sony CorporationInventors: Satoshi Kodama, Reiko Sugihara, Hideki Matsuoka, Yasushi Tanaka, Tatsuhiko Hiratani, Kenji Tahara, Kenichi Mitsuzuka, Kenichiro Takayanagi, Masamichi Okada, Hiroaki Kato, Chohachi Sato
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Patent number: 6562150Abstract: A steel sheet for heat shrink band of the present invention has anhysteretic magnetic permeability of 15,000 or higher at 0.35 Oe and yield stress of 24 kgf/mm2 or more. The steel sheet can be manufactured by a method comprising the steps of: hot rolling and/or cold rolling a steel containing 0.01 to 0.15% C by weight; annealing the rolled steel sheet at a temperature ranging from 650 to 900° C.; and temper rolling the annealed steel sheet at a rolling reduction rate of 1.5% or less. A CRT made of the steel sheet causes very little color deviation and practically no deformation of the panel surface.Type: GrantFiled: March 9, 2001Date of Patent: May 13, 2003Assignees: NKK Corporation, Sony CorporationInventors: Tatsuhiko Hiratani, Hideki Matsuoka, Yasushi Tanaka, Reiko Sugihara
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Patent number: 6527876Abstract: A silicon steel sheet having low iron loss of high frequency has a surface layer of the steel sheet which has Si concentration higher than Si concentration of a center portion of the steel sheet. Si concentration of sheet thickness center is 3.4 wt. % or more and Si concentration of the surface layer of the steel sheet is 5 wt. % or more. Si concentration in a surface layer portion is 5 to 8 wt. %. The production method comprises siliconizing treatment and diffusing treatment. Velocity of siliconizing and diffusing are controlled, and Si concentration distribution in the sheet thickness direction of the steel sheet is controlled.Type: GrantFiled: January 24, 2000Date of Patent: March 4, 2003Assignee: NKK CorporationInventors: Misao Namikawa, Yoshikazu Takada, Shoji Kasai, Hironori Ninomiya, Tsunehiro Yamaji, Tatsuhiko Hiratani
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Publication number: 20020139450Abstract: The present invention provides a steel sheet for a heat shrink band, containing, by mass %, 0.005% or less of C, 0.5 to 4% of Si, 2% or less of Mn, 0.2% or less of P, 0.04% or less of S, 0.2% or less of sol.Al, 0.01% or less of N, 0.0003 to 0.004% of B, 0.005% or less of O, and 0.002 to 0.1% of Sb, the balance being substantially formed of Fe, or a steel sheet for a heat shrink band further having a ratio of content of B to content of N (B/N) in the range from 0.2 to 1. This steel sheet realizes a heat shrink band having high strength and sufficient magnetic shielding properties.Type: ApplicationFiled: January 24, 2002Publication date: October 3, 2002Applicant: NKK CORPORATIONInventors: Yoshihiko Ono, Hideki Matsuoka, Tatsuhiko Hiratani, Yasushi Tanaka
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Publication number: 20020134466Abstract: A silicon steel sheet having low iron loss of high frequency has a surface layer of the steel sheet which has Si concentration higher than Si concentration of a center portion of the steel sheet. Si concentration of sheet thickness center is 3.4 wt. % or more and Si concentration of the surface layer of the steel sheet is 5 wt. % or more. Si concentration in a surface layer portion is 5 to 8 wt. %. The production method comprises siliconizing treatment and diffusing treatment. Velocity of siliconizing and diffusing are controlled, and Si concentration distribution in the sheet thickness direction of the steel sheet is controlled.Type: ApplicationFiled: January 24, 2000Publication date: September 26, 2002Inventors: MISAO NAMIKAWA, YOSHIKAZU TAKADA, SHOJI KASAI, HIRONORI NINOMIYA, TSUNEHIRO YAMAJI, TATSUHIKO HIRATANI
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Patent number: 6416594Abstract: A heat shrink band steel sheet of the present invention comprises on the basis of percent in weight C: 0.1% or less, Si: 0.1% or less, Mn: 0.1 to 2%, P: 0.15% or less, S: 0.02% or less, sol Al: 0.08% or less, and N: 0.005% or less, or C: 0.005% or less, Si: 0.1% or less, Mn: 0.1 to 2%, P: 0.15% or less, S: 0.02% or less, sol Al: 0.08% or less, N: 0.005% or less, Ti: 0.02 to 0.06%, and B: 0.0003 to 0.005%, wherein the product of a magnetic permeability at the magnetic field of 0.3 Oe after heat shrinking treatment and a thickness (mm) is at least 350. A color CRT having a sufficient magnetic shielding characteristic and a less amount of color deviation can be realized by the steel sheet.Type: GrantFiled: October 5, 2000Date of Patent: July 9, 2002Assignee: NKK CorporationInventors: Nobuo Yamagami, Kunikazu Tomita, Yasuyuki Takada, Yoshihiko Oda, Hideki Matsuoka, Tatsuhiko Hiratani, Katsumi Nakajima, Kenji Tahara
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Publication number: 20020070653Abstract: The present invention relates to a method of making a steel sheet for a tension mask, comprising the steps of: hot rolling a steel consisting essentially of, by weight %, C: less than 0.1%, Si: 0.05% or less, Mn: 0.4 to 2%, P: 0.03% or less, S: 0.03% or less, sol.Al: 0.01% or less, N: 0.010% or more, and the balance of Fe; and annealing the cold rolled steel sheet, followed by a secondary cold rolling at a reduction rate of 35% or higher. The steel sheet produced by this method shows excellent creep resistance during blackening treatment and excellent magnetic shielding property with an anhysteretic permeability of 3400 or more at a DC bias magnetic field of 0.35 Oe, and therefore causes no color-deviation when applied to the tension mask.Type: ApplicationFiled: August 14, 2001Publication date: June 13, 2002Applicant: NKK CORPORATIONInventors: Satoshi Kodama, Reiko Sugihara, Hideki Matsuoka, Yasushi Tanaka, Tatsuhiko Hiratani, Kenji Tahara, Kenichi Mitsuzuka
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Publication number: 20020011282Abstract: A steel sheet for heat shrink band of the present invention has anhysteretic magnetic permeability of 15,000 or higher at 0.35 Oe and yield stress of 24 kgf/mm2 or more. The steel sheet can be manufactured by a method comprising the steps of: hot rolling and/or cold rolling a steel containing 0.01 to 0.15% C by weight; annealing the rolled steel sheet at a temperature ranging from 650 to 900° C.; and temper rolling the annealed steel sheet at a rolling reduction rate of 1.5% or less. A CRT made of the steel sheet causes very little color deviation and practically no deformation of the panel surface.Type: ApplicationFiled: March 9, 2001Publication date: January 31, 2002Inventors: Tatsuhiko Hiratani, Hideki Matsuoka, Yasushi Tanaka, Reiko Sugihara
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Patent number: 6241829Abstract: A silicon steel sheet contains 0.01 wt. % or less C, 4 to 10 wt. % Si, 0.5 wt. % or less Mn, 0.01 wt. % or less P, 0.01 wt. % or less S, 0.2 wt. % or less sol. Al, 0.01 wt. % or less N, 0.02 wt. % or less O and the balance being Fe. The silicon steel sheet has grain boundaries and carbides which are precipitated on the grain boundaries. The carbides have an area of 20% or less to an area of the grain boundaries. The steel sheet is cooled at a cooling speed of 5° C./sec. or more in a temperature range of from 300 to 700° C.Type: GrantFiled: December 9, 1999Date of Patent: June 5, 2001Assignee: NKK CorporationInventors: Koichiro Fujita, Yasushi Tanaka, Hironori Ninomiya, Tatsuhiko Hiratani, Shoji Kasai