Patents by Inventor Katsumi Kojima
Katsumi Kojima 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: 11913087Abstract: Provided is a high-strength steel sheet having excellent ductility, bendability, and TS of 500 MPa or more, in particular, a high-strength thin steel sheet for cans having a sheet thickness of 0.1 to 0.8 mm, the steel sheet having a chemical composition containing C: 0.03-0.15%, Si: 0.01-0.05%, Mn: more than 0.6% and 1.5% or less, P: 0.025% or less, S: 0.02% or less, Al: 0.01-0.10%, N: 0.0005-0.0100%, Ti: 0.005-0.020%, B: 0.0005-0.0100%, and Nb: 0.0050-0.0200% with the balance being Fe and inevitable impurities, in which the steel sheet has a metallic structure containing, in area ratio, 85% or more of ferrite and 1-10% of martensite, the martensite has a grain size of 5 ?m or less, and a ratio of martensite having a grain size of 2 ?m or less is 80% or more.Type: GrantFiled: October 29, 2018Date of Patent: February 27, 2024Assignee: JFE STEEL CORPORATIONInventors: Fusae Shiimori, Hayato Saito, Nobusuke Kariya, Katsumi Kojima
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Patent number: 11618932Abstract: A steel sheet for a two-piece can, the steel sheet includes: by mass %, C: 0.010% or more and less than 0.050%; Si: 0.04% or less; Mn: 0.10% or more and less than 0.40%; P: 0.02% or less; S:0.020% or less; Al: more than 0.030% and 0.100% or less; N: 0.0005% or more and less than 0.0030%; B: 0.0005% to 0.0030%; and balance Fe and inevitable impurities, wherein an amount of N that is present as BN and a whole amount of N satisfy the following expression (1): [N as BN]/[N]>0.5??(1), where N as BN represents the amount of N that is present as BN, and N represents the whole amount of N, tensile strength is 420 MPa to 540 MPa, elongation is 5% or more, yield elongation is 3% or less, and ?r is ?0.50 to 0.10.Type: GrantFiled: March 12, 2018Date of Patent: April 4, 2023Assignee: JFE STEEL CORPORATIONInventors: Hayato Saito, Nobusuke Kariya, Katsumi Kojima
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Patent number: 11518144Abstract: A laminated metal sheet for a metal container lid includes a polyester resin layer formed on a metal sheet. The polyester resin layer is composed of an A and a B layer, wherein the melting point of the A layer is lower than the melting point of the B layer by 20° C. or more, the A layer includes a molten layer where the value of the ratio of a peak intensity I0° to a peak intensity I90° is 1.5 or less, the B layer includes an orientation layer where the value of the ratio of the peak intensity I0° to the peak intensity I90° is 3.0 or more, the thickness of the A layer is within the range from 5 ?m or more to less than 30 ?m, and the thickness of the B layer is within the range from 0.5 ?m or more to less than 6.0 ?m.Type: GrantFiled: May 15, 2017Date of Patent: December 6, 2022Assignee: JFE STEEL CORPORATIONInventors: Tomonari Hiraguchi, Yasuhide Oshima, Katsumi Kojima
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Patent number: 11486018Abstract: A steel sheet for a two-piece can, the steel sheet includes: by mass %, C: 0.010% or more and less than 0.030%; Si: 0.04% or less; Mn: 0.10% or more and less than 0.40%; P: 0.02% or less; S: 0.020% or less; Al: more than 0.030% and 0.100% or less; N: 0.0005% or more and less than 0.0030%; B: 0.0005% to 0.0030%; and balance Fe and inevitable impurities, wherein an amount of N that is present as BN and a whole amount of N satisfy the following expression (1): [N as BN]/[N]>0.5 ??(1), where N as BN represents the amount of N that is present as BN, and N represents the whole amount of N, a yield point is 280 MPa or more and less than 420 MPa, yield elongation is 3% or less, and ?r is ?0.30 to 0.20.Type: GrantFiled: March 12, 2018Date of Patent: November 1, 2022Assignee: JFE STEEL CORPORATIONInventors: Hayato Saito, Nobusuke Kariya, Junichi Kitagawa, Katsumi Kojima
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Publication number: 20220316023Abstract: Provided is a steel sheet for cans with high strength and sufficiently high formability particularly as a material for a can body with a neck portion. The steel sheet for cans of the present disclosure has a chemical composition containing, in mass %, C: 0.010% to 0.130%, Si: 0.04% or less, Mn: 0.10% to 1.00%, P: 0.007% to 0.100%, S: 0.0005% to 0.0090%, Al: 0.001% to 0.100%, N: 0.0050% or less, Ti: 0.0050% to 0.1000%, B: 0.0005% to less than 0.0020%, and Cr: 0.08% or less, where 0.005?(Ti*/48)/(C/12)?0.700 is satisfied; and a microstructure with a proportion of non-recrystallized ferrite of 3% or less, wherein an upper yield stress is 550 MPa to 620 MPa.Type: ApplicationFiled: June 8, 2020Publication date: October 6, 2022Applicant: JFE STEEL CORPORATIONInventors: Nobusuke KARIYA, Fusae SHIIMORI, Katsumi KOJIMA, Daisuke OTANI
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Patent number: 11459149Abstract: A steel sheet for crown cap having excellent formability from which a crown cap having an excellent pressure resistance can be produced without an expensive soft liner even if the steel sheet is subjected to sheet metal thinning, the steel sheet having: a chemical composition containing, in mass %, C: more than 0.006% and 0.012% or less, Si: 0.02% or less, Mn: 0.10% or more and 0.60% or less, P: 0.020% or less, S: 0.020% or less, Al: 0.01% or more and 0.07% or less, and N: 0.0080% or more and 0.0200% or less, with the balance being Fe and inevitable impurities; and a percentage of a region of more than 0% and less than 20% at a position of ½ of a sheet thickness, the region having a dislocation density of 1×1014 m?2 or less.Type: GrantFiled: July 25, 2018Date of Patent: October 4, 2022Assignee: JFE STEEL CORPORATIONInventors: Takashi Ueno, Nobusuke Kariya, Katsumi Kojima, Yoshihide Yamamoto, Akihiro Katagiri
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Publication number: 20220274130Abstract: A resin coated metal sheet includes: a metal sheet; and a resin layer configured to coat at least one face of the metal sheet. A pushing depth of the resin layer on a side adhered to the one face of the metal sheet is 100 nm to 250 nm, the pushing depth being determined by a nano indentation test, and a melting point of the resin layer is 210° C. to 270° C.Type: ApplicationFiled: July 31, 2020Publication date: September 1, 2022Applicant: JFE STEEL CORPORATIONInventors: Soichi FUJIMOTO, Tomonari HIRAGUCHI, Yasuhide OSHIMA, Yuya KAWAI, Katsumi KOJIMA
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Publication number: 20220274378Abstract: A resin coated metal sheet includes: a metal sheet; and a resin layer configured to coat at least one face of the metal sheet. An indentation modulus of the resin layer on a side adhered to the metal sheet is 100 MPa to 300 MPa, and a melting point of the resin layer is 210° C. to 270° C.Type: ApplicationFiled: July 31, 2020Publication date: September 1, 2022Applicant: JFE STEEL CORPORATIONInventors: Soichi FUJIMOTO, Tomonari HIRAGUCHI, Yasuhide OSHIMA, Yuya KAWAI, Katsumi KOJIMA
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Patent number: 11407203Abstract: A resin-coated metal sheet for a container includes: a metal sheet; a first resin coating layer provided on an inner face of the metal sheet after forming; and a second resin coating layer provided on an outer face of the metal sheet after forming, the second resin coating layer containing: polyester resin having a melting point of 230° C. to 254° C. as a main component; and a lubricant component, a melting point of the lubricant component being 80° C. to 230° C., an average particle diameter of the lubricant component present on a surface of the second resin coating layer being 17.0 nm or less.Type: GrantFiled: October 12, 2018Date of Patent: August 9, 2022Assignee: JFE Steel CorporationInventors: Yuya Kawai, Junichi Kitagawa, Yasuhide Oshima, Katsumi Kojima
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Patent number: 11401092Abstract: A resin-coated metal sheet for a container, the metal sheet including: a first resin coat layer provided on a first surface of the metal sheet; a second resin coat layer provided on a second surface of the metal sheet, wherein each of the first and the second resin coat layers is composed mainly of a polyester resin having a melting point of 230° C. to 254° C., and the first resin coat layer, in a state that the resin coat layers coat the metal sheet, is formed of a resin material having: an arithmetic average roughness (Ra) of 0.10 ?m to 1.0 ?m; a crystallization temperature of 110° C. to 160° C.; and a water contact angle of 55 degrees to 80 degrees in a state that the resin coat layers have been heated at 240° C. for 90 seconds after the resin coat layers coat the metal sheet.Type: GrantFiled: May 24, 2018Date of Patent: August 2, 2022Assignee: JFE STEEL CORPORATIONInventors: Junichi Kitagawa, Tomonari Hiraguchi, Norihiko Nakamura, Hayato Saito, Yasuhide Oshima, Katsumi Kojima
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Patent number: 11377743Abstract: Provided are: a multilayer structure in which a titanium oxide layer exhibits excellent photocatalytic activity; and a method for producing this multilayer structure. The above-described multilayer structure comprises: a conductive part which contains a metal element A other than Ti, while having electrical conductivity; and a titanium oxide layer which is arranged on the conductive part and contains 1.0% by atom or more of the metal element A.Type: GrantFiled: June 8, 2018Date of Patent: July 5, 2022Assignees: JFE Steel Corporation, National University Corporation Hokkaido UniversityInventors: Mikito Suto, Takeshi Suzuki, Yusuke Nakagawa, Katsumi Kojima, Hiroki Habazaki, Yuki Satoh
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Patent number: 11359255Abstract: A steel sheet for crown cap having: a chemical composition containing, C, Si, Mn, P, S, Al, N, with the balance being Fe and inevitable impurities; a ferrite phase in a region from a depth of ¼ of a sheet thickness to a mid-thickness part, the ferrite phase having a standard deviation of ferrite grain size of 7.0 ?m or less; a yield strength of 560 MPa or more and 700 MPa or less in a rolling direction; and a difference of 25 MPa or more between a yield strength in a 2% strain tensile test and a yield strength in a tensile test after heat treatment at 170° C. for 20 minutes, in the rolling direction.Type: GrantFiled: July 25, 2018Date of Patent: June 14, 2022Assignee: JFE STEEL CORPORATIONInventors: Nobusuke Kariya, Takashi Ueno, Yoshihide Yamamoto, Katsumi Kojima, Bungo Tateno
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Patent number: 11339491Abstract: A steel sheet for cans which exhibits excellent weldability; and a production method therefor include a steel sheet for cans with the surface of a steel sheet in order from the steel sheet side, a chromium metal layer and a hydrous chromium oxide layer. The deposited amount of the chromium metal layer is 65-200 mg/m2. The deposited amount of the hydrous chromium oxide layer in terms of chromium is 3-30 mg/m2. The chromium metal layer includes: a base part having a thickness of 7.0 nm or higher; and granular protrusions which are on the base part, have a maximum grain size of 100 nm or lower, and have a number density per unit area of at least 200 per ?m2.Type: GrantFiled: June 5, 2018Date of Patent: May 24, 2022Assignee: JFE STEEL CORPORATIONInventors: Yusuke Nakagawa, Takeshi Suzuki, Mikito Suto, Katsumi Kojima, Yuya Baba, Hanyou Sou, Yoichiro Yamanaka, Shunsuke Tokui
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Publication number: 20220093882Abstract: A film-laminated metal sheet including a resin film configured to coat a metal sheet on at least one surface, wherein an arithmetic mean height Sa0 of a surface of the resin film is 3.0 nm or smaller, and an arithmetic mean height change ratio {(Sa1/Sa0)×100} of the surface of the resin film is 80% to 120%, where Sa1 denotes an arithmetic mean height of the surface of the resin film after thermal treatment at 100° C.Type: ApplicationFiled: December 19, 2019Publication date: March 24, 2022Applicant: JFE STEEL CORPORATIONInventors: Soichi FUJIMOTO, Yasuhide OSHIMA, Katsumi KOJIMA
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Publication number: 20220074031Abstract: Provided is a steel sheet for cans. A steel sheet for cans comprises: a chemical composition containing, in mass %, C: 0.010% or more and 0.130% or less, Si: 0.04% or less, Mn: 0.10% or more and 1.00% or less, P: 0.007% or more and 0.100% or less, S: 0.0005% or more and 0.0090% or less, Al: 0.001% or more and 0.100% or less, N: 0.0050% or less, Ti: 0.0050% or more and 0.1000% or less, and Cr: 0.08% or less, and satisfying a relationship 0.005?(Ti*/48)/(C/12)?0.700 where Ti*=Ti?1.5S, with a balance consisting of Fe and inevitable impurities; a microstructure in which a proportion of cementite in ferrite grains is 10% or less; and an upper yield strength of 550 MPa or more.Type: ApplicationFiled: November 13, 2019Publication date: March 10, 2022Applicant: JFE STEEL CORPORATIONInventors: Nobusuke KARIYA, Fusae SHIIMORI, Katsumi KOJIMA, Daisuke OTANI
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Publication number: 20220018003Abstract: A steel sheet for cans has a chemical composition containing, in mass percent, C: 0.085% to 0.130%, Si: 0.04% or less, Mn: 0.10% to 0.60%, P: 0.02% or less, S: more than 0.010% to 0.020%, Al: 0.02% to 0.10%, N: 0.0005% to 0.0040%, Nb: 0.007% to 0.030%, and B: 0.0010% to 0.0050%, B/N that is the ratio of the content (mass percent) of B to the content (mass percent) of N being 0.80 or more, the remainder being Fe and inevitable impurities, and a ferrite microstructure containing 1.0% or more pearlite in terms of area fraction. The steel sheet for cans has a yield stress of 500 MPa or more, a tensile strength of 550 MPa or more, a uniform elongation of 10% or more, and a yield elongation of 5.0% or less.Type: ApplicationFiled: November 5, 2019Publication date: January 20, 2022Applicant: JFE Steel CorporationInventors: Hayato Saito, Nobusuke Kariya, Katsumi Kojima
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Publication number: 20210370655Abstract: A film for coating a metal sheet, the film satisfying that: a ratio (EMD/ETD) of a Young's modulus EMD in a lengthwise direction to a Young's modulus ETD in a width direction is 1.1 to 4.0; and a thermal shrinkage rate, measured by a thermo-mechanical analyzer, in both lengthwise and width directions at 200° C. is equal to or smaller than 20%.Type: ApplicationFiled: October 21, 2019Publication date: December 2, 2021Applicant: JFE Steel CorporationInventors: Soichi Fujimoto, Yasuhide Oshima, Katsumi Kojima
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Patent number: 10968528Abstract: A steel sheet for cans which exhibits excellent weldability; and a production method therefore include the surface of a steel sheet in order from the steel sheet side, a chromium metal layer and a hydrous chromium oxide layer. The deposited amount of the chromium metal layer is 50-200 mg/m2. The deposited amount of the hydrous chromium oxide layer in terms of chromium is 3-30 mg/m2. The chromium metal layer includes: a base part having a thickness of 7.0 nm or higher; and granular protrusions which are on the base part, have a maximum grain size of 200 nm or lower, and have a number density per unit area of at least 30 per ?m2.Type: GrantFiled: June 5, 2018Date of Patent: April 6, 2021Assignee: JFE STEEL CORPORATIONInventors: Yusuke Nakagawa, Takeshi Suzuki, Mikito Suto, Katsumi Kojima, Yuya Baba, Hanyou Sou, Yoichiro Yamanaka, Shunsuke Tokui
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Patent number: 10941456Abstract: A steel sheet for a can having high strength, excellent ductility, and good corrosion resistance, and a method for manufacturing the steel sheet. The steel sheet has a chemical composition containing, by mass %, C: 0.020% or more and 0.130% or less, Si: 0.04% or less, Mn: 0.10% or more and 1.20% or less, P: 0.007% or more and 0.100% or less, S: 0.030% or less, Al: 0.001% or more and 0.100% or less, N: more than 0.0120% and 0.0200% or less, Nb: 0.0060% or more and 0.0300% or less, and Fe and inevitable impurities. An absolute value of a difference in an amount of solid solution Nb between a region from a surface to a position located at ? of a thickness and a region from a position located at ? of the thickness to a position located at 4/8 of the thickness is 0.0010 mass % or more.Type: GrantFiled: February 2, 2017Date of Patent: March 9, 2021Assignee: JFE STEEL CORPORATIONInventors: Masaki Tada, Katsumi Kojima
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Patent number: 10927474Abstract: A steel sheet for cans which exhibits excellent weldability; and a production method therefore include the surface of a steel sheet in order from the steel sheet side, a chromium metal layer and a hydrous chromium oxide layer. The deposited amount of the chromium metal layer is 50-200 mg/m2. The deposited amount of the hydrous chromium oxide layer in terms of chromium is 3-30 mg/m2. The chromium metal layer includes: a base part having a thickness of 7.0 nm or higher; and granular protrusions which are on the base part, have a maximum grain size of 200 nm or lower, and have a number density per unit area of at least 30 per ?m2.Type: GrantFiled: June 5, 2018Date of Patent: February 23, 2021Assignee: JFE STEEL CORPORATIONInventors: Yusuke Nakagawa, Takeshi Suzuki, Mikito Suto, Katsumi Kojima, Yuya Baba, Hanyou Sou, Yoichiro Yamanaka, Shunsuke Tokui