Patents by Inventor Shinya Teramoto
Shinya Teramoto 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: 20180259022Abstract: A spring steel wire includes, by mass %, C: 0.40% to 0.75%, Si: 1.00% to 5.00%, Mn: 0.20% to 2.00%, P: 0.0001% to 0.0500%, S: 0.0001% to 0.0500%, Cr: 0.50% to 3.50%, Al: 0.0005% to 0.0500%, N: 0.0020% to 0.0100%, Mo: 0% to 2.00%, V: 0% to 0.50%, W: 0% to 0.50%, Nb: 0% to 0.100%, Ti: 0% to 0.100%, Ca: 0% to 0.0100%, Mg: 0% to 0.0100%, Zr: 0% to 0.1000%. B: 0% to 0.0100%, Cu: 0% to 1.00%, Ni: 0% to 3.00%, and a remainder consisting of Fe and impurities. A structure includes, by area radio, tempered martensite of 90% or more. The prior austenite grain size number is No. 12.5 or higher. The presence density of iron-based carbide having an equivalent circle diameter ranging from 0.15 ?m to 0.50 ?m ranges from 0.40 pieces/?m2 to 2.00 pieces/?m2.Type: ApplicationFiled: September 5, 2016Publication date: September 13, 2018Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shinya TERAMOTO, Hiroshi YARITA, Shouichi SUZUKI
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Patent number: 10036086Abstract: A non-heat treated steel according to the present invention includes, as steel composition, by mass %, 0.20 to 0.60% of C, 0.50 to 2.0% of Si, 0.20 to 2.0% of Mn, 0.010 to 0.15% of P, 0.010 to 0.15% of S, 0.10 to 0.50% of V. 0.002 to 0.02% of N, and a balance consisting of Fe and impurities, in which, when a ratio of a maximum value of a V content in the steel to an average value of the V content in the steel in a cross section of the steel is defined as a segregation ratio of V, the segregation ratio of V is 1.0 or more and less than 3.0.Type: GrantFiled: April 30, 2013Date of Patent: July 31, 2018Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shinya Teramoto, Manabu Kubota
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Publication number: 20170152578Abstract: A rolled steel bar for machine structural use includes a predetermined chemical composition. In the rolled steel bar for machine structural use, K1 obtained from “K1=C+Si/7+Mn/5+1.54×V” is 0.95 to 1.05, K2 obtained from “K2=139?28.6×Si+105×Mn?833×S?13420×N” is more than 35, a Mn content and a S content satisfy Mn/S?8.0, and a total decarburized depth of a surface layer is 500 ?m or less.Type: ApplicationFiled: July 3, 2015Publication date: June 1, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hiromasa TAKADA, Shinya TERAMOTO, Osamu OHYAMA
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Publication number: 20170137904Abstract: A rolled steel bar for machine structural use includes a predetermined chemical composition. In the rolled steel bar for machine structural use, K1 obtained from “K1=C+Si/7+Mn/5+1.54×V” is 0.95 to 1.05, K2 obtained from “K2=139?28.6×Si+105×Mn?833×S?13420×N” is more than 35, K3 obtained from “K3=137×C?44.0×Si” is 10.7 or more, a Mn content and a S content satisfy Mn/S?8.0, and a total decarburized depth in a surface layer is 500 ?m or less.Type: ApplicationFiled: July 3, 2015Publication date: May 18, 2017Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hiromasa TAKADA, Shinya TERAMOTO, Osamu OHYAMA
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Patent number: 9523404Abstract: The present invention provides a spring steel, which is finally formed into a spring, by making use of, at a maximum, the temper softening resistance effect due to alloying elements while suppressing the formation of hard inclusions of SiO2 and the generation of decarburization, which may cause deterioration of fatigue characteristics of the spring. The spring steel is characterized by comprising, in % by mass, C: 0.50 to 0.70%, Si: 1.00 to 5.00%, Mn: 0.30 to 2.00%, P: 0.0002 to 0.0500%, S: 0.0002 to 0.0500%, Cr: 0.10 to 3.50%, Al: 0.0005 to 0.0500%, and N: 0.0020 to 0.0100%, with the balance being Fe and inevitable impurities, wherein the H-value defined by the following equation (a) is 160 or more, and the C-value defined by the following equation (b) is 3.25 or less: H=33.6[C]+10.0[Si]+5.95[Mn]+11.1[Cr]+90.0??(a), and C=[Si]/[Mn]??(b).Type: GrantFiled: August 15, 2012Date of Patent: December 20, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shinya Teramoto, Manabu Kubota
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Patent number: 9487848Abstract: The present invention provides hot forging use non heat-treated steel where controlled cooling after shaping by hot forging is used to make the main structure of the steel martensite even without subsequent reheating and heat treatment by quenching and tempering and thereby give a steel part with a high strength and high toughness and superior machineability and a hot forged non heat-treated steel part made of that steel, in particular provides a martensite type hot forging use non heat-treated steel characterized by containing, by mass %, C: 0.10 to 0.20%, Si: 0.10 to 0.50%, Mn: 1.0 to 3.0%, P: 0.001 to 0.1%, S: 0.005 to 0.8%, Cr: 0.10 to 1.50%, Al: over 0.1 to 0.20%, and N: 0.0020 to 0.Type: GrantFiled: March 10, 2016Date of Patent: November 8, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shinya Teramoto, Kei Miyanishi, Masayuki Hashimura
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Publication number: 20160251743Abstract: The present invention provides hot forging use non heat-treated steel where controlled cooling after shaping by hot forging is used to make the main structure of the steel martensite even without subsequent reheating and heat treatment by quenching and tempering and thereby give a steel part with a high strength and high toughness and superior machineability and a hot forged non heat-treated steel part made of that steel, in particular provides a martensite type hot forging use non heat-treated steel characterized by containing, by mass %, C: 0.10 to 0.20%, Si: 0.10 to 0.50%, Mn: 1.0 to 3.0%, P: 0.001 to 0.1%, S: 0.005 to 0.8%, Cr: 0.10 to 1.50%, Al: over 0.1 to 0.20%, and N: 0.0020 to 0.Type: ApplicationFiled: March 10, 2016Publication date: September 1, 2016Inventors: Shinya TERAMOTO, Kei MIYANISHI, Masayuki HASHIMURA
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Patent number: 9376738Abstract: The present invention provides hot forging use non heat-treated steel where controlled cooling after shaping by hot forging is used to make the main structure of the steel martensite even without subsequent reheating and heat treatment by quenching and tempering and thereby give a steel part with a high strength and high toughness and superior machineability and a hot forged non heat-treated steel part made of that steel, in particular provides a martensite type hot forging use non heat-treated steel characterized by containing, by mass %, C: 0.10 to 0.20%, Si: 0.10 to 0.50%, Mn: 1.0 to 3.0%, P: 0.001 to 0.1%, S: 0.005 to 0.8%, Cr: 0.10 to 1.50%, Al: over 0.1 to 0.20%, and N: 0.0020 to 0.Type: GrantFiled: October 27, 2008Date of Patent: June 28, 2016Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shinya Teramoto, Kei Miyanishi, Masayuki Hashimura
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Patent number: 9255314Abstract: The invention provides a hot-forging micro-alloyed steel which achieves excellent fracture-splitability and machinability, without impairing productivity or mechanical properties and without the addition of Pb or the like. It also provides a component made of hot-forged micro-alloyed steel. The hot-forging micro-alloyed steel contains, in mass %, C: from 0.35 to 0.60%, Si: 0.50 to 2.50%, Mn: 0.20 to 2.00%, P: 0.010 to 0.150%, S: 0.040 to 0.150%, V: 0.10 to 0.50%, Zr: over 0.0023 to 0.0050%, Ca: 0.0005 to 0.0050% and N: 0.0069 to 0.0200%, Al being limited to less than 0.010%, and a balance substantially of Fe and unavoidable impurities.Type: GrantFiled: April 4, 2014Date of Patent: February 9, 2016Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Manabu Kubota, Shinya Teramoto
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Patent number: 9187797Abstract: The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: exceeding 0.20 to 0.25%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 ?m or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more.Type: GrantFiled: May 25, 2012Date of Patent: November 17, 2015Assignee: NIPPON STEEL AND SUMITOMO METAL CORPORATIONInventors: Shinya Teramoto, Hiromasa Takada, Manabu Kubota, Yoichi Taniguchi, Junichi Nakatsuka, Kazuhiro Fujimura, Satoshi Koganemaru
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Publication number: 20150218685Abstract: A non-heat treated steel according to the present invention includes, as steel composition, by mass %, 0.20 to 0.60% of C, 0.50 to 2.0% of Si, 0.20 to 2.0% of Mn, 0.010 to 0.15% of P, 0.010 to 0.15% of S, 0.10 to 0.50% of V. 0.002 to 0.02% of N, and a balance consisting of Fe and impurities, in which, when a ratio of a maximum value of a V content in the steel to an average value of the V content in the steel in a cross section of the steel is defined as a segregation ratio of V, the segregation ratio of V is 1.0 or more and less than 3.0.Type: ApplicationFiled: April 30, 2013Publication date: August 6, 2015Inventors: Shinya Teramoto, Manabu Kubota
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Patent number: 8926767Abstract: The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: exceeding 0.25 to 0.50%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 ?m or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more.Type: GrantFiled: May 25, 2012Date of Patent: January 6, 2015Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Shinya Teramoto, Hiromasa Takada, Manabu Kubota
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Patent number: 8916008Abstract: The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: 0.05 to 0.20%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 ?m or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more.Type: GrantFiled: May 25, 2012Date of Patent: December 23, 2014Assignee: Nippon Steel and Sumitomo Metal CorporationInventors: Shinya Teramoto, Hiromasa Takada, Manabu Kubota
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Publication number: 20140219858Abstract: The invention provides a hot-forging micro-alloyed steel and a hot-rolled steel which achieve excellent fracture-splitability and machinability, without impairing productivity or mechanical properties and without addition of Pb or the like. It also provides a component made of hot-forged micro-alloyed steel. The hot-forging micro-alloyed steel comprises, in mass %, C: greater than 0.35 to 0.60%, Si: 0.50 to 2.50%, Mn: 0.20 to 2.00%, P: 0.010 to 0.150%, S: 0.040 to 0.150%, V: 0.10 to 0.50%, Zr: 0.0005 to 0.0050%, Ca: 0.0005 to 0.0050% and N: 0.0020 to 0.0200%, Al being limited to less than 0.010%, and a balance substantially of Fe and unavoidable impurities.Type: ApplicationFiled: April 4, 2014Publication date: August 7, 2014Applicant: Nippon Steel & Sumitomo Metal CorporationInventors: Manabu Kubota, Shinya Teramoto
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Publication number: 20140193288Abstract: The present invention provides a spring steel, which is finally formed into a spring, by making use of, at a maximum, the temper softening resistance effect due to alloying elements while suppressing the formation of hard inclusions of SiO2 and the generation of decarburization, which may cause deterioration of fatigue characteristics of the spring. The spring steel is characterized by comprising, in % by mass, C: 0.50 to 0.70%, Si: 1.00 to 5.00%, Mn: 0.30 to 2.00%, P: 0.0002 to 0.0500%, S: 0.0002 to 0.0500%, Cr: 0.10 to 3.50%, Al: 0.0005 to 0.0500%, and N: 0.0020 to 0.0100%, with the balance being Fe and inevitable impurities, wherein the H-value defined by the following equation (a) is 160 or more, and the C-value defined by the following equation (b) is 3.25 or less: H=33.6[C]+10.0[Si]+5.95[Mn]+11.1[Cr]+90.0??(a), and C=[Si]/[Mn]??(b).Type: ApplicationFiled: August 15, 2012Publication date: July 10, 2014Inventors: Shinya Teramoto, Manabu Kubota
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Patent number: 8715428Abstract: The invention provides a hot-forging micro-alloyed steel and a hot-rolled steel which achieve excellent fracture-splitability and machinability, without impairing productivity or mechanical properties and without addition of Pb or the like. It also provides a component made of hot-forged micro-alloyed steel. The hot-forging micro-alloyed steel contains, in mass %, C: greater than 0.35 to 0.60%, Si: 0.50 to 2.50%, Mn: 0.20 to 2.00%, P: 0.010 to 0.150%, S: 0.040 to 0.150%, V: 0.10 to 0.50%, Zr: 0.0005 to 0.0050%, Ca: 0.0005 to 0.0050% and N: 0.0069 to 0.0200%, Al being limited to less than 0.010%, and a balance of Fe and unavoidable impurities.Type: GrantFiled: November 5, 2008Date of Patent: May 6, 2014Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Manabu Kubota, Shinya Teramoto
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Publication number: 20130186529Abstract: The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: exceeding 0.20 to 0.25%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 ?m or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more.Type: ApplicationFiled: May 25, 2012Publication date: July 25, 2013Applicant: NIPPON STEEL AND SUMITOMO METAL CORPORATIONInventors: Shinya Teramoto, Hiromasa Takada, Manabu Kubota, Yoichi Taniguchi, Junichi Nakatsuka, Kazuhiro Fujimura, Satoshi Koganemaru
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Publication number: 20130186528Abstract: The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: 0.05 to 0.20%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 ?m or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more.Type: ApplicationFiled: May 25, 2012Publication date: July 25, 2013Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Shinya Teramoto, Hiromasa Takada, Manabu Kubota
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Publication number: 20130167986Abstract: The present invention provides a steel part for machine structural use whose fatigue strength and toughness are improved and a manufacturing method thereof. A steel part made of a steel containing, in mass %, C: 0.05 to 0.20%, Si: 0.10 to 1.00%, Mn: 0.75 to 3.00%, P: 0.001 to 0.050%, S: 0.001 to 0.200%, V: exceeding 0.25 to 0.50%, Cr: 0.01 to 1.00%, Al: 0.001 to 0.500%, and N: 0.0080 to 0.0200%, and a balance being composed of Fe and inevitable impurities, in which a steel structure contains a bainite structure having an area ratio of 95% or more, a bainite lath width is 5 ?m or less, V carbide having an average grain diameter of not less than 4 nm nor more than 7 nm dispersedly exists in the bainite structure, and an area ratio of V carbide in the bainite structure is 0.18% or more.Type: ApplicationFiled: May 25, 2012Publication date: July 4, 2013Applicant: NIPPON STEEL AND SUMITOMO METAL CORPORATIONInventors: Shinya Teramoto, Hiromasa Takada, Manabu Kubota
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Patent number: 8186696Abstract: A steel tie rod end includes a shaft portion and first and second fitting portions. A minimum area portion having a small radially cross-sectional area is provided for the shaft portion, and 90% or above of a steel structure of the minimum area portion is formed of martensite or tempered martensite. The surface hardness of the minimum area portion and the average hardness of the radial cross section of the minimum area portion are 600 Hv or below, and the average hardness of the radial cross section of the first fitting portion and the average hardness of the radial cross section of the second fitting portion are 300 Hv or below. A method of manufacturing a steel tie rod end includes a quenching process of heating only a prospective shaft portion by high frequency to an austenitizing temperature and then rapidly cooling the prospective shaft portion by water or cooling medium.Type: GrantFiled: September 7, 2009Date of Patent: May 29, 2012Assignees: Toyota Jidosha Kabushiki Kaisha, Nippon Steel CorporationInventors: Takeshi Komoto, Hitoshi Sakuma, Takashi Hirano, Hiroyuki Mizuno, Shinya Teramoto, Masahiro Toda, Hiromasa Takada, Makoto Okonogi