Patents by Inventor Seiki Nishida
Seiki Nishida 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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Patent number: 9689053Abstract: The present invention inexpensively provides with high productivity and good yield a steel rod superior in drawability and a steel wire superior in twistability using the same as a material, that is, draws a high strength steel rod superior in ductility where the chemical components contain C: 0.80 to 1.20%, Si: 0.1 to 1.5%, Mn: 0.1 to 1.0%, Al: 0.01% or less, Ti: 0.01% or less, one or both of W: 0.005 to 0.2% and Mo: 0.003 to 0.2%, N: 10 to 30 ppm, B: 4 to 30 ppm (of which, solute B is 3 ppm or more), and O: 10 to 40 ppm, which has a balance of Fe and unavoidable impurities, has an area percentage of pearlite structures of 97% or more, has a balance of non-pearlite structures, and has a total of the area percentage of the non-pearlite structures and the area percentage of the coarse pearlite structures of 15% or less, to obtain high strength steel wire superior in ductility having a tensile strength of 3600 MPa or more and a number density of voids of lengths of 5 ?m or more at the center of 100/mm2 or less.Type: GrantFiled: November 12, 2015Date of Patent: June 27, 2017Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shingo Yamasaski, Seiki Nishida
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Publication number: 20160145713Abstract: The present invention inexpensively provides with high productivity and good yield a steel rod superior in drawability and a steel wire superior in twistability using the same as a material, that is, draws a high strength steel rod superior in ductility where the chemical components contain C: 0.80 to 1.20%, Si: 0.1 to 1.5%, Mn: 0.1 to 1.0%, Al: 0.01% or less, Ti: 0.01% or less, one or both of W: 0.005 to 0.2% and Mo: 0.003 to 0.Type: ApplicationFiled: November 12, 2015Publication date: May 26, 2016Inventors: Shingo YAMASASKI, Seiki NISHIDA
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Patent number: 9274298Abstract: There is provided a deformed steel wire includes, as a chemical component, by mass %; C: 0.30% to 1.10%, Si: 0.10% to 1.50%, and Mn: 0.20% to 1.50%, and the balance consists of Fe and unavoidable impurities, in which a metallographic structure is a ferrite-pearlite structure or a pearlite structure, integration degrees of a crystal orientation <110> in a longitudinal direction of a thickness center area and a surface area are in a range of 2.0 to 4.0, an absolute value of a difference in the integration degree between an inner surface and an outer surface of the surface area is 0.3 or less, an integration degree of a crystal orientation <100> in a thickness direction of the thickness center area is in a range of 1.2 to 3.8, and a dimensional accuracy index is in a range of 0.5 to 2.0.Type: GrantFiled: October 3, 2013Date of Patent: March 1, 2016Assignees: NIPPON STEEL & SUMITOMO METAL CORPORATION, Namitei Co., Ltd., OCC CorporationInventors: Makoto Kosaka, Shouichi Ohashi, Seiki Nishida, Masatsugu Murao, Kouichi Murao, Ken Oyamada, Syunya Ikebata
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Patent number: 9212410Abstract: The present invention inexpensively provides with high productivity and good yield a steel rod superior in drawability and a steel wire superior in twistability using the same as a material, that is, draws a high strength steel rod superior in ductility where the chemical components contain C: 0.80 to 1.20%, Si: 0.1 to 1.5%, Mn: 0.1 to 1.0%, Al: 0.01% or less, Ti: 0.01% or less, one or both of W: 0.005 to 0.2% and Mo: 0.003 to 0.2%, N: 10 to 30 ppm, B: 4 to 30 ppm (of which, solute B is 3 ppm or more), and O: 10 to 40 ppm, which has a balance of Fe and unavoidable impurities, has an area percentage of pearlite structures of 97% or more, has a balance of non-pearlite structures, and has a total of the area percentage of the non-pearlite structures and the area percentage of the coarse pearlite structures of 15% or less, to obtain high strength steel wire superior in ductility having a tensile strength of 3600 MPa or more and a number density of voids of lengths of 5 ?m or more at the center of 100/mm2 or less.Type: GrantFiled: March 9, 2009Date of Patent: December 15, 2015Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shingo Yamasaki, Seiki Nishida
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Publication number: 20150301297Abstract: There is provided a deformed steel wire includes, as a chemical component, by mass %; C: 0.30% to 1.10%, Si: 0.10% to 1.50%, and Mn: 0.20% to 1.50%, and the balance consists of Fe and unavoidable impurities, in which a metallographic structure is a ferrite-pearlite structure or a pearlite structure, integration degrees of a crystal orientation <110> in a longitudinal direction of a thickness center area and a surface area are in a range of 2.0 to 4.0, an absolute value of a difference in the integration degree between an inner surface and an outer surface of the surface area is 0.3 or less, an integration degree of a crystal orientation <100> in a thickness direction of the thickness center area is in a range of 1.2 to 3.8, and a dimensional accuracy index is in a range of 0.5 to 2.0.Type: ApplicationFiled: October 3, 2013Publication date: October 22, 2015Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION, OCC Corporation, Namitei Co., Ltd.Inventors: Makoto KOSAKA, Shouichi OHASHI, Seiki NISHIDA, Masatsugu MURAO, Kouichi MURAO, Ken OYAMADA, Syunya IKEBATA
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Patent number: 8864920Abstract: A high strength wire rod in which an area fraction of pro-eutectoid ferrite is 3% or less and an area fraction of pearlite structure is 90% or more, being obtained by subjecting a hard steel wire rod having specified composition to a molten salt patenting treatment directly after hot-rolling or after performing re-austenitization subsequent to hot-rolling.Type: GrantFiled: June 29, 2006Date of Patent: October 21, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Shingo Yamasaki, Arata Iso, Seiki Nishida
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Patent number: 8859095Abstract: Provided is a wire rod contains, in mass %: C: 0.6 to 1.1%; Si: 0.1 to 0.5%; Mn: 0.2 to 0.6%; S: 0.004 to 0.015%; and, Cr: 0.02 to less than 0.05%; with a balance including Fe and inevitable impurities in which P is limited to 0.02% by mass or lower and Al is limited to 0.003% by mass or lower; the wire rod has a pearlite in a surface thereof; and, the wire rod has, in a peripheral portion in a cross section thereof, a {110} crystal plane of ferrite in the pearlite, an accumulation degree of the crystal plane being 1.2 or more.Type: GrantFiled: November 4, 2010Date of Patent: October 14, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Seiki Nishida, Nariyasu Muroga, Hitoshi Demachi
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Patent number: 8557060Abstract: The invention provides a steel material with satisfactory hydrogen embrittlement resistance, and particularly it relates to high-strength steel with satisfactory hydrogen embrittlement resistance and a strength of 1200 MPa or greater, as well as a process for production thereof. At least one simple or compound deposit of oxides, carbides or nitrides as hydrogen trap sites which trap hydrogen with a specific trap energy is added to steel, where the mean sizes, number densities, and length-to-thickness ratios (aspect ratio) are in specific ranges. By applying the specific steel components and production process it is possible to obtain high-strength steel with excellent hydrogen embrittlement resistance.Type: GrantFiled: July 15, 2011Date of Patent: October 15, 2013Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Shingo Yamasaki, Daisuke Hirakami, Toshimi Tarui, Seiki Nishida
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Patent number: 8308875Abstract: The invention provides wire rod excellent in drawability and steel wire made from the wire rod as starting material with high productivity at good yield and low cost. A hard steel wire rod of a specified composition is hot rolled, the hot-rolled steel is coiled in a specified temperature range, and the coiled steel is subjected to patenting at a predetermined cooling rate, thereby affording a high-carbon steel wire excellent in workability. It is high-strength steel wire excellent in drawability comprising a pearlite structure of an area ratio of 97% or greater and the balance of non-pearlite structures including bainite, degenerate-pearlite and pro-eutectoid ferrite and having a pearlite block size of not less than 20 ?m and not greater than 45 ?m. The invention also provides a high-carbon steel wire excellent in ductility, which is manufactured by subjecting the wire rod to intermediate patenting and cold drawing and has a tensile strength of 2800 MPa or greater.Type: GrantFiled: April 18, 2007Date of Patent: November 13, 2012Assignee: Nippon Steel CorporationInventors: Shingo Yamasaki, Seiki Nishida, Makio Kikuchi
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Patent number: 8168011Abstract: The invention provides wire rod excellent in drawability and steel wire made from the wire rod as starting material with high productivity at good yield and low cost. A hard steel wire rod of a specified composition is heated in a specified temperature range to conduct post-reaustenization patenting and thereby obtain a high-carbon steel wire excellent in ductility that has a pearlite structure of an area ratio of 97% or greater and the balance of non-pearlite structures including bainite, degenerate-pearlite and pro-eutectoid ferrite and whose fracture reduction of area RA satisfies Expressions (1), (2) and (3) below: RA?RAmin??(1), where RAmin=a?b×pearlite block size (?m), a=?0.0001187×TS (MPa)2+0.31814×TS (MPa)?151.32??(2) b=0.0007445×TS (MPa)?0.3753??(3).Type: GrantFiled: April 18, 2007Date of Patent: May 1, 2012Assignee: Nippon Steel CorporationInventors: Shingo Yamasaki, Seiki Nishida, Makio Kikuchi
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Patent number: 8142577Abstract: A wire rod which is mainly composed of pearlite and has an area fraction of 5% or less of a non-pearlite structure composed of pro-eutectoid ferrite, degenerate-pearlite or bainite in a section, or has an area fraction of 10% or less of a non-pearlite structure in a portion from the surface to a depth of 100 ?m.Type: GrantFiled: June 29, 2006Date of Patent: March 27, 2012Assignee: Nippon Steel CorporationInventors: Shingo Yamasaki, Arata Iso, Seiki Nishida
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Patent number: 8105698Abstract: A plated steel wire for PWS with excellent twist properties contains, in terms of mass %, 0.8 to 1.1% of C, 0.8 to 1.3% of Si, 0.3 to 0.8% of Mn, 0.001 to 0.006% of N, and 0.0004 to 0.0060% of B, where a quantity of solid-solubilized B is at least 0.0002%, also contains either one or both of 0.005 to 0.1% of Al and 0.005 to 0.1% of Ti, and contains as the remainder, Fe and unavoidable impurities, wherein an area fraction of non-pearlite structures in a region from a surface layer down to a depth of 50 ?m is not more than 10%, an area fraction of non-pearlite structures within an entire cross-section is not more than 5%, and a surface of the steel wire is galvanized with a plating quantity within a range from 300 to 500 g/m2.Type: GrantFiled: December 10, 2007Date of Patent: January 31, 2012Assignee: Nippon Steel CorporationInventors: Toshiyuki Manabe, Shingo Yamasaki, Seiki Nishida
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Publication number: 20110284139Abstract: A high-carbon steel wire rod of high ductility for steel cord and the like is provided that experiences little breakage during drawing. The high-carbon steel wire rod of high ductility is a high-carbon steel wire rod fabricated by hot rolling that that has a carbon content of 0.7 mass % or greater, wherein 95% or greater of the wire rod metallographic structure is pearlite structure and the maximum pearlite block size of pearlite at the core of the hot-rolled wire rod is 65 ?m or less. The high-carbon steel wire rod of high ductility has a tensile strength in a range of {248+980×(C mass %)}±40 MPa} and a reduction of area of {72.8?40×(C mass %) %} or greater. The high-carbon steel wire rod of high ductility is characterized in that the average pearlite block size at the core of the hot-rolled wire rod constituted by ferrite grain boundaries of an orientation difference of 9 degrees or greater as measured with an EBSP analyzer is 10 ?m or greater and 30 ?m or less.Type: ApplicationFiled: May 31, 2011Publication date: November 24, 2011Applicant: NIPPON STEEL CORPORATIONInventors: Seiki Nishida, Shingo Yamasaki, Hitoshi Demachi, Nariyasu Muroga, Shouichi Ohashi, Kenichi Nakamura, Makoto Kosaka, Nobuyuki Komiya, Susumu Sahara
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Publication number: 20110268600Abstract: The invention provides a steel material with satisfactory hydrogen embrittlement resistance, and particularly it relates to high-strength steel with satisfactory hydrogen embrittlement resistance and a strength of 1200 MPa or greater, as well as a process for production thereof. At least one simple or compound deposit of oxides, carbides or nitrides as hydrogen trap sites which trap hydrogen with a specific trap energy is added to steel, where the mean sizes, number densities, and length-to-thickness ratios (aspect ratio) are in specific ranges. By applying the specific steel components and production process it is possible to obtain high-strength steel with excellent hydrogen embrittlement resistance.Type: ApplicationFiled: July 15, 2011Publication date: November 3, 2011Applicant: Nippon Steel CorporationInventors: Shingo YAMASAKI, Daisuke Hirakami, Toshimi Tarui, Seiki Nishida
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Publication number: 20110229718Abstract: Provided is a wire rod contains, in mass %: C: 0.6 to 1.1%; Si: 0.1 to 0.5%; Mn: 0.2 to 0.6% ; S: 0.004 to 0.015%; and, Cr: 0.02 to less than 0.05%; with a balance including Fe and inevitable impurities in which P is limited to 0.02% by mass or lower and Al is limited to 0.003% by mass or lower; the wire rod has a pearlite in a surface thereof; and, the wire rod has, in a peripheral portion in a cross section thereof, a {110} crystal plane of ferrite in the pearlite, an accumulation degree of the crystal plane being 1.2 or more.Type: ApplicationFiled: November 4, 2010Publication date: September 22, 2011Inventors: Seiki Nishida, Nariyasu Muroga, Hitoshi Demachi
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Patent number: 8016953Abstract: The invention provides a steel material with satisfactory hydrogen embrittlement resistance, and particularly it relates to high-strength steel with satisfactory hydrogen embrittlement resistance and a strength of 1200 MPa or greater, as well as a process for production thereof. At least one simple or compound deposit of oxides, carbides or nitrides as hydrogen trap sites which trap hydrogen with a specific trap energy is added to steel, where the mean sizes, number densities, and length-to-thickness ratios (aspect ratio) are in specific ranges. By applying the specific steel components and production process it is possible to obtain high-strength steel with excellent hydrogen embrittlement resistance.Type: GrantFiled: January 20, 2004Date of Patent: September 13, 2011Assignee: Nippon Steel CorporationInventors: Shingo Yamasaki, Daisuke Hirakami, Toshimi Tarui, Seiki Nishida
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Publication number: 20100239884Abstract: A plated steel wire for a parallel wire strand (PWS) with excellent twist properties can include, in terms of mass %, about 0.8 to 1.1% of C, about 0.8 to 1.3% of Si, about 0.3 to 0.8% of Mn, about 0.001 to 0.006% of N, and about 0.0004 to 0.0060% of B, where a quantity of solid-solubilized B is at least 0.0002%. Such exemplary wire can include either one or both of about 0.005 to 0.1% of Al and/or about 0.005 to 0.1% of Ti, and may contain, as the remainder, Fe and unavoidable impurities. For example, an area fraction of non-pearlite structures in a region from a surface layer down to a depth of about 50 ?m is likely not more than about 10%, an area fraction of non-pearlite structures within an entire cross-section is likely not more than about 5%, and a surface of the steel wire can be galvanized with a plating quantity within a range from about 300 to 500 g/m2.Type: ApplicationFiled: December 10, 2007Publication date: September 23, 2010Applicant: Nippon Steel CorporationInventors: Toshiyuki Manabe, Shingo Yamasaki, Seiki Nishida
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Publication number: 20100212786Abstract: The invention provides wire rod excellent in drawability and steel wire made from the wire rod as starting material with high productivity at good yield and low cost. A hard steel wire rod of a specified composition is heated in a specified temperature range to conduct post-reaustenization patenting and thereby obtain a high-carbon steel wire excellent in ductility that has a pearlite structure of an area ratio of 97% or greater and the balance of non-pearlite structures including bainite, degenerate-pearlite and pro-eutectoid ferrite and whose fracture reduction of area RA satisfies Expressions (1), (2) and (3) below: RA?Ramin??(1), where RAmin=a?b×pearlite block size (?m), a=?0.0001187×TS (MPa)2+0.31814×TS (MPa)?151.32??(2) b=0.0007445×TS (MPa)?0.3753??(3).Type: ApplicationFiled: April 18, 2007Publication date: August 26, 2010Inventors: Shingo Yamasaki, Seiki Nishida, Makio Kikuchi
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Publication number: 20100126643Abstract: The present invention inexpensively provides with high productivity and good yield a steel rod superior in drawability and a steel wire superior in twistability using the same as a material, that is, draws a high strength steel rod superior in ductility where the chemical components contain C: 0.80 to 1.20%, Si: 0.1 to 1.5%, Mn: 0.1 to 1.0%, Al: 0.01% or less, Ti: 0.01% or less, one or both of W: 0.005 to 0.2% and Mo: 0.003 to 0.Type: ApplicationFiled: March 9, 2009Publication date: May 27, 2010Inventors: Shingo Yamasaski, Seiki Nishida
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Publication number: 20090277545Abstract: The invention provides wire rod excellent in drawability and steel wire made from the wire rod as starting material with high productivity at good yield and low cost. A hard steel wire rod of a specified composition is hot rolled, the hot-rolled steel is coiled in a specified temperature range, and the coiled steel is subjected to patenting at a predetermined cooling rate, thereby affording a high-carbon steel wire excellent in workability. It is high-strength steel wire excellent in drawability comprising a pearlite structure of an area ratio of 97% or greater and the balance of non-pearlite structures including bainite, degenerate-pearlite and pro-eutectoid ferrite and having a pearlite block size of not less than 20 ?m and not greater than 45 ?m. The invention also provides a high-carbon steel wire excellent in ductility, which is manufactured by subjecting the wire rod to intermediate patenting and cold drawing and has a tensile strength of 2800 MPa or greater.Type: ApplicationFiled: April 18, 2007Publication date: November 12, 2009Applicant: NIPPON STEEL CORPORATIONInventors: Shingo Yamasaki, Seiki Nishida, Makio Kikuchi