Patents by Inventor Kenichiro Eguchi
Kenichiro Eguchi 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: 11072835Abstract: Provided herein is a high-strength seamless stainless steel pipe. The high-strength seamless stainless steel pipe contains, in mass %, C: 0.05% or less, Si: 0.5% or less, Mn: 0.15 to 1.0%, P: 0.030% or less, S: 0.005% or less, Cr: 14.5 to 17.5%, Ni: 3.0 to 6.0%, Mo: 2.7 to 5.0%, Cu: 0.3 to 4.0%, W: 0.1 to 2.5%, V: 0.02 to 0.20%, Al: 0.10% or less, N: 0.15% or less, and the balance being Fe and unavoidable impurities. C, Si, Mn, Cr, Ni, Mo, Cu, and N satisfy a specific formula. Cu, Mo, W, Cr, and Ni satisfy another specific formula. The high-strength seamless stainless steel pipe has more than 45% martensite phase, 10 to 45% ferrite phase, and 30% or less retained austenite phase. The total amount of precipitated Cr, precipitated Mo, and precipitated W is 0.75 mass % or less.Type: GrantFiled: June 14, 2017Date of Patent: July 27, 2021Assignee: JFE Steel CorporationInventors: Kenichiro Eguchi, Yasuhide Ishiguro
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Patent number: 10995200Abstract: Provided are a kaolin clay for a thermoplastic resin composition that can provide high impact strength and glossiness and a thermoplastic resin composition containing the same. A kaolin clay for a thermoplastic resin composition is subjected to a surface treatment with 0.2 to 10 parts by mass of at least one selected from the group consisting of methyl silicate, ethyl silicate, propyl silicate, and butyl silicate relative to 100 parts by mass of the kaolin clay.Type: GrantFiled: May 31, 2017Date of Patent: May 4, 2021Assignee: SHIRAISHI KOGYO KAISHA, LTD.Inventors: Kenichiro Eguchi, Yutaka Minamino, Ruriko Nakagawa, Kosuke Kawai, Masahiro Matsui
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Patent number: 10975450Abstract: A low alloy high strength thick-walled seamless steel pipe for oil country tubular goods is provided having a wall thickness of 40 mm or more and a yield strength of 758 MPa or more, the steel pipe including a composition containing, in terms of mass %, C: 0.25 to 0.31%, Si: 0.01 to 0.35%, Mn: 0.55 to 0.70%, P: 0.010% or less, S: 0.001% or less, O: 0.0015% or less, Al: 0.015 to 0.040%, Cu: 0.02 to 0.09%, Cr: 0.8 to 1.5%, Mo: 0.9 to 1.6%, V: 0.04 to 0.10%, Nb: 0.005 to 0.05%, B: 0.0015 to 0.0030%, Ti: 0.005 to 0.020%, and N: 0.005% or less, and having Ti/N of 3.0 to 4.0, with the balance being Fe and inevitable impurities, wherein a cumulative frequency rate at a measurement point at which a Mo segregation degree by a predetermined expression is 1.5 or more is 1% or less.Type: GrantFiled: November 18, 2016Date of Patent: April 13, 2021Assignee: JFE Steel CorporationInventors: Mitsuhiro Okatsu, Masao Yuga, Kenichiro Eguchi, Haruo Nakamichi
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Patent number: 10876183Abstract: A high-strength seamless stainless steel pipe has a composition including, by mass %, 0.05% or less C, 1.0% or less Si, 0.1 to 0.5% Mn, 0.05% or less P, 0.005% or less S, more than 16.0% to 18.0% or less Cr, more than 2.0% to 3.0% or less Mo, 0.5 to 3.5% Cu, 3.0% or more and less than 5.0% Ni, 0.01 to 3.0% W, 0.01 to 0.5% Nb, 0.001 to 0.3% Ti, 0.001 to 0.1% Al, less than 0.07% N, 0.01% or less O, and Fe and unavoidable impurities as a balance, wherein the steel pipe has a microstructure including a tempered martensite phase forming a main phase, 20 to 40% of a ferrite phase in terms of volume ratio, and 25% or less of a residual austenite phase in terms of volume ratio, an average grain size of the ferrite phase is 40 ?m or less, and a sum of amounts of Ti and Nb precipitated as precipitates having a grain size of 2 ?m or less is 0.Type: GrantFiled: June 13, 2016Date of Patent: December 29, 2020Assignee: JFE Steel CorporationInventors: Kenichiro Eguchi, Yasuhide Ishiguro, Takeshi Suzuki, Kazuki Fujimura, Hiroki Ota
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Publication number: 20200247984Abstract: The present invention relates to a resin composition containing: 100 parts by weight of a polypropylene resin; 0.2 parts by weight to 2 parts by weight of an olefinic elastomer; 2 parts by weight to 5 parts by weight of a talc having an aspect ratio in a range of 35 to 60; 2 parts by weight to 5 parts by weight of a fibrous magnesium sulfate having an average fiber diameter of 0.1 ?m to 2 ?m and an average fiber length of 8 ?m to 30 ?m; and 0.01 parts by weight to 1 part by weight of a metallic soap that is at least one selected from the group consisting of a magnesium salt of a fatty acid and an aluminum salt of a fatty acid.Type: ApplicationFiled: January 27, 2020Publication date: August 6, 2020Inventors: Atsumasa SASAKI, Yutaka MINAMINO, Kenichiro EGUCHI, Yasuaki TANAKA, Hitoshi UCHIDA
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Publication number: 20200216936Abstract: The invention is intended to provide a high-strength stainless steel seamless pipe for oil country tubular goods having high strength with a yield strength of 862 MPa (125 ksi) or more, excellent low-temperature toughness, and excellent corrosion resistance. The invention is also intended to provide a method for manufacturing such a high-strength stainless steel seamless pipe. The high-strength stainless steel seamless pipe has a microstructure that is at least 45% tempered martensite phase, 20 to 40% ferrite phase, and more than 10% and 25% or less retained austenite phase by volume. The high-strength stainless steel seamless pipe has a yield strength of 862 MPa or more, and a maximum crystal grain diameter of 500 ?m or less for ferrite crystal grains when crystal grains with a crystal orientation difference of within 15° are defined as the same crystal grains.Type: ApplicationFiled: July 25, 2018Publication date: July 9, 2020Applicant: JFE Steel CorporationInventors: Yuichi Kamo, Masao Yuga, Kenichiro Eguchi, Yasuhide Ishiguro
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Publication number: 20200157646Abstract: Provided is a high-strength seamless stainless steel pipe for oil country tubular goods which possesses a high strength, excellent low-temperature toughness and excellent corrosion resistance even when the steel pipe has a large wall thickness. The high-strength seamless stainless steel pipe has the composition which contains, by mass %, C: 0.05% or less, Si: 1.0% or less, Mn: 0.1 to 0.5%, P: 0.05% or less, S: less than 0.005%, Cr: more than 15.0% to 19.0% or less, Mo: more than 2.0% to 3.0% or less, Cu: 0.3 to 3.5%, Ni: 3.0% or more and less than 5.0%, W: 0.1 to 3.0%, Nb: 0.07 to 0.5%, V: 0.01 to 0.5%, Al: 0.001 to 0.1%, N: 0.010 to 0.100%, O: 0.01% or less, and Fe and unavoidable impurities as a balance. Nb, Ta, C, N and Cu satisfy a specified formula. The steel pipe has a microstructure which is formed of 45% or more of a tempered martensite phase, 20 to 40% of a ferrite phase, and more than 10% and 25% or less of a residual austenite phase in terms of volume ratio.Type: ApplicationFiled: November 2, 2016Publication date: May 21, 2020Applicants: JFE STEEL CORPORATION, JFE STEEL CORPORATIONInventors: Kenichiro EGUCHI, Yasuhide ISHIGURO
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Publication number: 20200062608Abstract: Provided are a calcium carbonate having a small particle diameter and easily dispersible in polymers and a production method therefor. A calcium carbonate has a magnesium content of 12000 to 120000 ppm, a BET specific surface area of 60 to 120 m2/g, and a crystallite size of (104) plane of 20 to 50 nm, and particles of the calcium carbonate are concatenated.Type: ApplicationFiled: February 23, 2018Publication date: February 27, 2020Applicant: SHIRAISHI KOGYO KAISHA, LTD.Inventors: Maya Yoshida, Kenichiro Eguchi
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Publication number: 20200040158Abstract: Provided is a white resin composition that can maintain a high degree of whiteness even after undergoing a thermal resistance test. A white resin composition contains: a white pigment; a surface-treated calcium carbonate in which particle surfaces of a synthetic calcium carbonate with an average particle diameter of 0.05 to 1 ?m are subjected to surface treatment with a condensed phosphoric acid and an organic modified silicone oil; and a resin, wherein a content ratio between the white pigment and the surface-treated calcium carbonate is, in mass ratio (white pigment to surface-treated calcium carbonate), within a range of 90:10 to 60:40, and a total content of the white pigment and the surface-treated calcium carbonate in the resin composition is within a range of 5 to 70% mass.Type: ApplicationFiled: October 17, 2016Publication date: February 6, 2020Applicant: SHIRAISHI KOGYO KAISHA, LTD.Inventors: Kenichiro Eguchi, Yutaka Minamino, Masahiro Matsui
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Publication number: 20190376157Abstract: Provided herein is a high-strength stainless steel seamless pipe for oil country tubular goods. The high-strength stainless steel seamless pipe having a yield strength of 862 MPa or more contains, in mass %, C:0.05% or less, Si: 0.5% or less, Mn: 0.15 to 1.0%, P: 0.030% or less, S: 0.005% or less, Cr: 14.5 to 17.5%, Ni: 3.0 to 6.0%, Mo: 2.7 to 5.0%, Cu: 0.3 to 4.0%, W: 0.1 to 2.5%, V: 0.02 to 0.20%, Al: 0.10% or less, N: 0.15% or less, B: 0.0005 to 0.0100%, and the balance Fe and unavoidable impurities, and in which the composition satisfies specific formulas. The stainless steel pipe has more than 45% martensite phase, 10 to 45% ferrite phase, and 30% or less retained austenite phase. The ferrite grains have a maximum crystal grain size of 500 ?m or less.Type: ApplicationFiled: January 23, 2018Publication date: December 12, 2019Applicant: JFE Steel CorporationInventors: Yuichi Kamo, Masao Yuga, Kenichiro Eguchi, Yasuhide Ishiguro
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Publication number: 20190368001Abstract: Provided herein is a high strength seamless stainless steel pipe. A method for producing such a high strength seamless stainless steel pipe is also provided. The high strength seamless stainless steel pipe has a certain composition. The high strength seamless stainless steel pipe has a structure that includes a tempered martensite phase as a primary phase, and 20 to 40% ferrite phase, and at most 25% residual austenite phase in terms of a volume fraction, and in which C, Cr, Ni, Mo, Nb, N, W, and Cu in the residual austenite phase satisfy a predetermined formula.Type: ApplicationFiled: December 6, 2017Publication date: December 5, 2019Applicant: JFE Steel CorporationInventors: Yuichi Kamo, Masao Yuga, Kenichiro Eguchi
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Publication number: 20190352752Abstract: A duplex stainless steel having excellent carbon dioxide corrosion resistance, excellent sulfide stress corrosion cracking resistance, and excellent sulfide stress cracking resistance. The duplex stainless steel comprises, by mass %, C: 0.03% or less, Si: 1.0% or less, Mn: 0.10 to 1.5%, P: 0.030% or less, S: 0.005% or less, Cr: 20.0 to 30.0%, Ni: 5.0 to 10.0%, Mo: 2.0 to 5.0%, Cu: 2.0 to 6.0%, N: less than 0.07%, at least one selected from Al: 0.05 to 1.0%, Ti: 0.02 to 1.0%, and Nb: 0.02 to 1.0%, and the balance being Fe and unavoidable impurities, and has a structure that is 20 to 70% austenite phase, and 30 to 80% ferrite phase in terms of a volume fraction.Type: ApplicationFiled: December 20, 2017Publication date: November 21, 2019Applicant: JFE STEEL CORPORATIONInventors: Kenichiro EGUCHI, Masao YUGA
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Publication number: 20190292618Abstract: Provided herein is a high-strength seamless stainless steel pipe. The high-strength seamless stainless steel pipe contains, in mass %, C: 0.05% or less, Si: 0.5% or less, Mn: 0.15 to 1.0%, P: 0.030% or less, S: 0.005% or less, Cr: 14.5 to 17.5%, Ni: 3.0 to 6.0%, Mo: 2.7 to 5.0%, Cu: 0.3 to 4.0%, W: 0.1 to 2.5%, V: 0.02 to 0.20%, Al: 0.10% or less, N: 0.15% or less, and the balance being Fe and unavoidable impurities. C, Si, Mn, Cr, Ni, Mo, Cu, and N satisfy a specific formula. Cu, Mo, W, Cr, and Ni satisfy another specific formula. The high-strength seamless stainless steel pipe has more than 45% martensite phase, 10 to 45% ferrite phase, and 30% or less retained austenite phase. The total amount of precipitated Cr, precipitated Mo, and precipitated W is 0.75 mass % or less.Type: ApplicationFiled: June 14, 2017Publication date: September 26, 2019Applicant: JFE Steel CorporationInventors: Kenichiro EGUCHI, Yasuhide ISHIGURO
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Publication number: 20190241989Abstract: Provided herein is a martensitic stainless steel seamless pipe, intended for oil country tubular goods, having high strength, and excellent sulfide stress corrosion cracking resistance. A method for producing such a martensitic stainless steel seamless pipe is also provided. The martensitic stainless steel seamless pipe for oil country tubular goods has a composition that contains, in mass %, C: 0.035% or less, Si: 0.5% or less, Mn: 0.05 to 0.5%, P: 0.03% or less, S: 0.005% or less, Cu: 2.6% or less, Ni: 5.3 to 7.3%, Cr: 11.8 to 14.5%, Al: 0.1% or less, Mo: 1.8 to 3.0%, V: 0.2% or less, N: 0.1% or less, and the balance Fe and unavoidable impurities, and in which C, Mn, Cr, Cu, Ni, Mo, W, Nb, N, and Ti satisfy the predetermined relations.Type: ApplicationFiled: September 13, 2017Publication date: August 8, 2019Applicant: JFE Steel CorporationInventors: Mami Endo, Kenichiro Eguchi, Masao Yuga
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Publication number: 20190211416Abstract: Provided herein is a dual-phase stainless steel having excellent carbon dioxide corrosion resistance, excellent sulfide stress corrosion cracking resistance, and excellent sulfide stress cracking resistance. The dual-phase stainless steel contains, in mass %, C: 0.03% or less, Si: 1.0% or less, Mn: 0.10 to 1.5%, P: 0.030% or less, S: 0.005% or less, Cr: 20.0 to 30.0%, Ni: 5.0 to 10.0%, Mo: 2.0 to 5.0%, Cu: 2.0 to 6.0%, N: less than 0.07%, and the balance Fe and unavoidable impurities, and has a structure that is 20 to 70% austenite phase, and 30 to 80% ferrite phase in terms of a volume fraction.Type: ApplicationFiled: August 22, 2017Publication date: July 11, 2019Applicant: JFE Steel CorporationInventors: Yusuke Yoshimura, Hiroki Ota, Masao Yuga, Yuichi Kamo, Kenichiro Eguchi
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Publication number: 20190177512Abstract: Provided are a kaolin clay for a thermoplastic resin composition that can provide high impact strength and glossiness and a thermoplastic resin composition containing the same. A kaolin clay for a thermoplastic resin composition is subjected to a surface treatment with 0.2 to 10 parts by mass of at least one selected from the group consisting of methyl silicate, ethyl silicate, propyl silicate, and butyl silicate relative to 100 parts by mass of the kaolin clay.Type: ApplicationFiled: May 31, 2017Publication date: June 13, 2019Applicant: SHIRAISHI KOGYO KAISHA, LTD.Inventors: Kenichiro Eguchi, Yutaka Minamino, Ruriko Nakagawa, Kosuke Kawai, Masahiro Matsui
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Publication number: 20190136337Abstract: A high strength stainless steel seamless pipe for oil country tubular goods which is excellent in hot workability, has a high strength, suppresses scattering in the strength, and has excellent carbon dioxide corrosion resistance. The steel pipe has a yield strength of 655 MPa or more, and a chemical composition comprising, by mass%, C: 0.005 to 0.05%, Si: 0.05 to 0.50%, Mn: 0.20 to 1.80%, P: 0.030% or less, S: 0.005% or less, Cr: 12.0 to 17.0%, Ni: 4.0 to 7.0%, Mo: 0.5 to 3.0%, Al: 0.005 to 0.10%, V: 0.005 to 0.20%, Co: 0.01 to 1.0%, N: 0.005 to 0.15%, and 0: 0.010% or less with the balance being Fe and inevitable impurities. Cr, Ni, Mo, Cu, and C satisfy a specified expression, and Cr, Mo, Si, C, Mn, Ni, Cu, and N satisfy another specified expression.Type: ApplicationFiled: December 16, 2016Publication date: May 9, 2019Applicant: JFE STEEL CORPORATIONInventors: Kenichiro EGUCHI, Yasuhide ISHIGURO
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Publication number: 20190100821Abstract: A high-strength seamless stainless steel pipe has a composition including, by mass %, 0.05% or less C, 1.0% or less Si, 0.1 to 0.5% Mn, 0.05% or less P, 0.005% or less S, more than 16.0% to 18.0% or less Cr, more than 2.0% to 3.0% or less Mo, 0.5 to 3.5% Cu, 3.0% or more and less than 5.0% Ni, 0.01 to 3.0% W, 0.01 to 0.5% Nb, 0.001 to 0.3% Ti, 0.001 to 0.1% Al, less than 0.07% N, 0.01% or less O, and Fe and unavoidable impurities as a balance, wherein the steel pipe has a microstructure including a tempered martensite phase forming a main phase, 20 to 40% of a ferrite phase in terms of volume ratio, and 25% or less of a residual austenite phase in terms of volume ratio, an average grain size of the ferrite phase is 40 ?m or less, and a sum of amounts of Ti and Nb precipitated as precipitates having a grain size of 2 ?m or less is 0.Type: ApplicationFiled: June 13, 2016Publication date: April 4, 2019Inventors: Kenichiro Eguchi, Yasuhide Ishiguro, Takeshi Suzuki, Kazuki Fujimura, Hiroki Ota
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Patent number: 10240221Abstract: A steel pipe is formed by performing pipe making of a raw material having a composition containing C: 0.05% or less, Si: 0.50% or less, Mn: 0.20% to 1.80%, P: 0.030% or less, S: 0.005% or less, Cr: 14.0% to 18.0%, Ni: 5.0% to 8.0%, Mo: 1.5% to 3.5%, Cu: 0.5% to 3.5%, Al: 0.10% or less, Nb: more than 0.20% and 0.50% or less, V: 0.20% or less, N: 0.15% or less, and O: 0.010% or less, on a percent by mass basis, wherein Cr+0.65Ni+0.6Mo+0.55Cu?20C?18.5 and Cr+Mo+0.3Si?43.3C?0.4Mn?Ni?0.3Cu?9N?11 are satisfied and subjecting the resulting steel pipe to a quenching treatment to heat to a temperature higher than or equal to the Ac3 transformation temperature and, subsequently, cool to a temperature of 100° C. or lower at a cooling rate higher than or equal to the air cooling rate and a tempering treatment to temper at a temperature lower than or equal to the Ac1 transformation temperature.Type: GrantFiled: January 14, 2014Date of Patent: March 26, 2019Assignee: JFE Steel CorporationInventors: Kenichiro Eguchi, Yasuhide Ishiguro
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Publication number: 20190055617Abstract: A low alloy high strength thick-walled seamless steel pipe for oil country tubular goods is provided having a wall thickness of 40 mm or more and a yield strength of 758 MPa or more, the steel pipe including a composition containing, in terms of mass %, C: 0.25 to 0.31%, Si: 0.01 to 0.35%, Mn: 0.55 to 0.70%, P: 0.010% or less, S: 0.001% or less, O: 0.0015% or less, Al: 0.015 to 0.040%, Cu: 0.02 to 0.09%, Cr: 0.8 to 1.5%, Mo: 0.9 to 1.6%, V: 0.04 to 0.10%, Nb: 0.005 to 0.05%, B: 0.0015 to 0.0030%, Ti: 0.005 to 0.020%, and N: 0.005% or less, and having Ti/N of 3.0 to 4.0, with the balance being Fe and inevitable impurities, wherein a cumulative frequency rate at a measurement point at which a Mo segregation degree by a predetermined expression is 1.5 or more is 1% or less.Type: ApplicationFiled: November 18, 2016Publication date: February 21, 2019Applicant: JFE Steel CorporationInventors: Mitsuhiro Okatsu, Masao Yuga, Kenichiro Eguchi, Haruo Nakamichi