Patents by Inventor Kazuaki Fukuoka
Kazuaki Fukuoka 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: 11702716Abstract: A case hardening steel having excellent fatigue resistance is provided at relatively low production cost. A case hardening steel has a chemical composition containing C: 0.10% to 0.30%, Si: 0.10% to 1.20%, Mn: 0.30% to 1.50%, S: 0.010% to 0.030%, Cr: 0.10% to 1.00%, B: 0.0005% to 0.0050%, Sb: 0.005% to 0.020%, and N: 0.0150% or less in a predetermined range, and further containing Al: 0.010%?Al?0.120% in the case where B?(10.8/14)N?0.0003%, and 27/14[N?(14/10.8)B+0.030]?Al?0.120% in the case where B?(10.8/14)N<0.0003%.Type: GrantFiled: January 25, 2016Date of Patent: July 18, 2023Assignee: JFE STEEL CORPORATIONInventors: Keisuke Ando, Kazuaki Fukuoka, Kunikazu Tomita
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Publication number: 20230193440Abstract: Free-cutting steel that has the same or better machinability compared to low-carbon sulfur-lead composite free-cutting steel, despite of no-addition of Pb, is provided. Free-cutting steel contains, in mass %, C: 0.08% or less, Mn: 0.50 to 1.50%, P: 0.100% or less, S: 0.250 to 0.500%, N: 0.0050 to 0.0150%, O: more than 0.0100% and 0.0500% or less, Cr: 0.50 to 1.50%, at least one of Si, Al, or Ti: 0.050 to 0.500% in total, with the balance being Fe and inevitable impurities, with an A value defined by formula (1) satisfying 0.40 to 2.00, and with a B value defined by formula (2) satisfying 1.10×10?3 to 1.50×10?2; and a steel microstructure with distributed 3000 or more sulfide particles with an equivalent circular diameter of 5 ?m or less per mm2.Type: ApplicationFiled: March 31, 2021Publication date: June 22, 2023Applicant: JFE STEEL CORPORATIONInventors: Masayuki KASAI, Kazuaki FUKUOKA, Kimihiro NISHIMURA
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Publication number: 20230108640Abstract: Provided is a free-cutting steel that, despites not containing Pb, has machinability by cutting higher than or equal to that of a low carbon sulfur-lead composite free-cutting steel. A free-cutting steel comprises: a chemical composition that contains, in mass %, C: less than 0.09%, Mn: 0.50% to 1.50%, S: 0.250% to 0.600%, O: more than 0.010% and 0.050% or less, and Cr: 0.50% to 1.50%, with a balance consisting of Fe and inevitable impurities, and in which a A value defined by the following formula (1) is 6.0 to 18.0, and a steel microstructure in which at least 500 particles/mm2 of sulfide of less than 1 ?m in equivalent circle diameter and at least 2000 particles/mm2 of sulfide of 1 ?m to 5 ?m in equivalent circle diameter are distributed.Type: ApplicationFiled: March 31, 2021Publication date: April 6, 2023Applicant: JFE STEEL CORPORATIONInventors: Masayuki KASAI, Kazuaki FUKUOKA, Kimihiro NISHIMURA
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Publication number: 20230029298Abstract: Free-cutting steel includes a specific composition, with an A value defined by a following formula (1) satisfying 4.0 or more and 20.0 or less, and remainder having Fe and an unavoidable impurity; and texture with 1000 or more sulfide particles with an equivalent circle diameter of less than 1 ?m per mm2, 500 or more sulfide particles with an equivalent circle diameter of 1 ?m or more and 5 ?m or less per mm2, and 1000 or more Pb particles with an equivalent circle diameter of 1 ?m or less per mm2, wherein A value=(Mn+5Cr)/S ??(1) here, symbols of elements in the formula indicate contents (% by mass) of the elements.Type: ApplicationFiled: December 23, 2020Publication date: January 26, 2023Applicant: JFE STEEL CORPORATIONInventors: Masayuki KASAI, Kazuaki FUKUOKA, Kimihiro NISHIMURA
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Patent number: 11427901Abstract: Provided is a wire rod that has superior machinability by cutting regardless of the type of tool material and the type of lubricant and even in the case where no lubricant is used. A wire rod for cutting work comprises: a specific chemical composition; and Vickers hardness that satisfies the following expressions (1) and (2) in the case where an average aspect ratio of ferrite grains at a position of ¼ of a diameter from a surface of the wire rod for cutting work is more than 2.8, and satisfies the following expressions (3) and (4) in the case where the average aspect ratio is 2.8 or less, Have?350??(1) H??30??(2) Have?250??(3) H??20??(4).Type: GrantFiled: February 27, 2018Date of Patent: August 30, 2022Assignee: JFE STEEL CORPORATIONInventors: Yuta Imanami, Kazuaki Fukuoka, Kimihiro Nishimura
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Publication number: 20200248291Abstract: Provided is a wire rod that has superior machinability by cutting regardless of the type of tool material and the type of lubricant and even in the case where no lubricant is used. A wire rod for cutting work comprises: a specific chemical composition; and Vickers hardness that satisfies the following expressions (1) and (2) in the case where an average aspect ratio of ferrite grains at a position of 1/4 of a diameter from a surface of the wire rod for cutting work is more than 2.8, and satisfies the following expressions (3) and (4) in the case where the average aspect ratio is 2.8 or less, Have?350 ??(1) H??30 ??(2) Have?250 ??(3) H??20 ??(4).Type: ApplicationFiled: February 27, 2018Publication date: August 6, 2020Applicant: JFE STEEL CORPORATIONInventors: Yuta IMANAMI, Kazuaki FUKUOKA, Kimihiro NISHIMURA
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Publication number: 20180030563Abstract: A case hardening steel having excellent fatigue resistance is provided at relatively low production cost. A case hardening steel has a chemical composition containing C: 0.10% to 0.30%, Si: 0.10% to 1.20%, Mn: 0.30% to 1.50%, S: 0.010% to 0.030%, Cr: 0.10% to 1.00%, B: 0.0005% to 0.0050%, Sb: 0.005% to 0.020%, and N: 0.0150% or less in a predetermined range, and further containing Al: 0.010%?Al?0.120% in the case where B?(10.8/14)N ?0.0003%, and 27/14[(N?(14/10.8)B+0.030]?Al?0.120% in the case where B?(10.8/14)N<0.0003%.Type: ApplicationFiled: January 25, 2016Publication date: February 1, 2018Applicant: JFE STEEL CORPORATIONInventors: Keisuke ANDO, Kazuaki FUKUOKA, Kunikazu TOMITA
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Publication number: 20170130288Abstract: A steel has a predetermined chemical composition with a balance being Fe and incidental impurities, wherein a sum of Cu content and Ni content is 0.15 mass % or more, and a crystal grain size after forming into a stabilizer shape and quenching is in a range of 7.5 to 10.5 in prior austenite crystal grain size number. Thus, a highly durable stabilizer steel that has a tensile strength of 1200 MPa or more and excellent normal-temperature and low-temperature toughness and is used in an environmentally friendly manufacturing process at lower cost can be realized.Type: ApplicationFiled: March 23, 2015Publication date: May 11, 2017Applicants: JFE Bars & Shapes Corporation, NHK SPRING CO., LTD.Inventors: Kazuaki FUKUOKA, Kunikazu TOMITA, Akira TANGE, Kiyoshi KURIMOTO, Yurika GOTO
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Publication number: 20170021691Abstract: A steel, having a high corrosion resistance and low-temperature toughness, for a vehicle suspension spring part, the steel includes 0.21 to 0.35% by mass of C, more than 0.6% by mass but 1.5% by mass or less of Si, 1 to 3% by mass of Mn, 0.3 to 0.8% by mass of Cr, 0.005 to 0.080% by mass of sol. Al, 0.005 to 0.060% by mass of Ti, 0.005 to 0.060% by mass of Nb, not more than 150 ppm of N, not more than 0.035% by mass of P, not more than 0.035% by mass of S, 0.01 to 1.00% by mass of Cu, and 0.01 to 1.00% by mass of Ni, the balance being Fe and unavoidable impurities, with Ti+Nb?0.07% by mass, wherein crystal grains of the steel after hardening have a prior austenite grain size number of 7.5 to 10.5, and the steel having a tensile strength of not less than 1,300 MPa.Type: ApplicationFiled: September 26, 2016Publication date: January 26, 2017Applicants: NHK SPRING CO., LTD., JFE BARS & SHAPES CORPORATIONInventors: Akira TANGE, Kiyoshi KURIMOTO, Yurika GOTO, Katsuhiko KIKUCHI, Kunikazu TOMITA, Kazuaki FUKUOKA, Kazuaki HATTORI
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Publication number: 20140060709Abstract: Steel, excellent in corrosion resistance and low-temperature toughness, for a vehicle suspension spring part, includes 0.15 to 0.35% by mass of C, more than 0.6% by mass but 1.5% by mass or less of Si, 1 to 3% by mass of Mn, 0.3 to 0.8% by mass of Cr, 0.005 to 0.080% by mass of sol. Al, 0.005 to 0.060% by mass of Ti, 0.005 to 0.060% by mass of Nb, not more than 150 ppm of N, not more than 0.035% by mass of P, not more than 0.035% by mass of S, 0.01 to 1.00% by mass of Cu, and 0.01 to 1.00% by mass of Ni, the balance consisting of Fe and unavoidable impurities, with Ti+Nb?0.07% by mass. The steel has a tensile strength of not less than 1,300 MPa.Type: ApplicationFiled: November 11, 2013Publication date: March 6, 2014Applicants: JFE BARS & SHAPES CORPORATION, NHK SPRING CO., LTD.Inventors: Akira TANGE, Kiyoshi KURIMOTO, Yurika GOTO, Katsuhiko KIKUCHI, Kunikazu TOMITA, Kazuaki FUKUOKA, Kazuaki HATTORI
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Patent number: 4286745Abstract: A container for flowable materials including liquids such as fruit juices and other beverages comprises a tubular body member composed of five plies bonded to each other, the first, third and fifth plies being each formed of an elongated helically wound polyolefin whose edges are overlapped and bonded with those of adjacent convolutions to form a cylindrical layer. The second and fourth plies are formed of a helically wound elongated cup paper sheet material which is thicker than the polyolefin sheet material and whose edges are in abutment with those of adjacent convolutions to form a cylindrical layer. In another container, the tubular body member is composed of a first (innermost) ply of polyolefin sheet material having overlapped convolutions, a second ply of aluminum sheet both sides of which are laminated by thin paper, a third ply of kraft paper liner having butted convolutions, and a fourth ply of polyolefin sheet material having overlapped convolutions.Type: GrantFiled: May 23, 1979Date of Patent: September 1, 1981Assignee: Norton Simon, Inc.Inventor: Kazuaki Fukuoka