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).
-
Patent number: 10301702Abstract: A can steel plate includes: equal or less than 0.0030% by mass of C; equal or less than 0.02% by mass of Si; 0.05-0.60% by mass of Mn; equal or less than 0.020% by mass of P; equal or less than 0.020% by mass of S; 0.010% to 0.100% by mass of Al; 0.0010-0.0050% by mass of N; 0.001-0.050% by mass of Nb; and balance Fe and impurities. Intensity of (111) [1-21] orientation (where ?2 represents 2 with bar in Miller indices) and intensity of (111)[1-10] orientation (where ?1 represents 1 with bar in Miller indices) satisfy the following equation (1), and in a rolling direction and 90° direction from the rolling direction in a horizontal plane, tensile strength TS (MPa) and fracture elongation El (%) satisfy relations of the following equations (2) and (3). (Intensity of (111) [1-21] orientation)/(Intensity of (111) [1-10] orientation)>0.9 . . . (1), TS>550 . . . (2), El>?0.02×TS+17.5 . . . (3).Type: GrantFiled: May 11, 2015Date of Patent: May 28, 2019Assignees: JFE STEEL CORPORATION, THYSSENKRUPP RASSELSTEIN GMBHInventors: Takumi Tanaka, Yusuke Nakagawa, Masaki Tada, Katsumi Kojima, Hiroki Nakamaru, Kathleen Stein-Fechner, Burkhard Kaup
-
Publication number: 20190134950Abstract: 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: ApplicationFiled: May 15, 2017Publication date: May 9, 2019Applicant: JFE Steel CorporationInventors: Tomonari Hiraguchi, Yasuhide Oshima, Katsumi Kojima
-
Patent number: 10252319Abstract: A laminated steel sheet for a two-piece can body with a high strain level satisfying the following formulae, the polyester resin layer composing the laminated steel sheet having a center line surface roughness (Ra) of 0.2 ?m to 1.8 ?m: r1?r,0.1?r1/R?0.25, and 1.5?h/(R?r)?4 wherein h is the height of the two-piece can body, r is the maximum radius, r1 is the minimum radius, and R is the radius of the circular laminated steel sheet before forming having the same weight as the can body.Type: GrantFiled: May 19, 2016Date of Patent: April 9, 2019Assignee: JFE STEEL CORPORATIONInventors: Yasuhide Oshima, Junichi Kitagawa, Hiroki Iwasa, Katsumi Kojima, Hiroshi Kubo
-
Publication number: 20190062859Abstract: 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: ApplicationFiled: February 2, 2017Publication date: February 28, 2019Applicant: JFE STEEL CORPORATIONInventors: Masaki TADA, Katsumi KOJIMA
-
Patent number: 10174393Abstract: A steel sheet containing C: 0.0005% or more and 0.0035% or less, Si: 0.05% or less, Mn: 0.1% or more and 0.6% or less, P: 0.02% or less, S: less than 0.02%, Al: 0.01% or more and less than 0.10%, N: 0.0030% or less, B: 0.0010% or more, in which the relationship B/N?3.0 is satisfied and the balance being Fe and inevitable impurities, and a microstructure in which the average integrated intensity f in the (111)[1-10] to (111)[-1-12] orientations on a plane parallel to a sheet surface at a position located at ¼ of the thickness of the steel sheet is 7.0 or more, in which an average ferrite grain size is 6.0 ?m or more and 10.0 ?m or less, and the relationships EAVE?215 GPa, E0?210 GPa, E45?210 GPa, E90?210 GPa, and ?0.4??r?0.4 are satisfied.Type: GrantFiled: April 19, 2012Date of Patent: January 8, 2019Assignee: JFE Steel CorporationInventors: Mikito Suto, Katsumi Kojima, Masaki Tada, Takumi Tanaka, Yoichi Tobiyama
-
Publication number: 20180363160Abstract: A steel sheet for cans has, on the surface thereof, in order from the steel sheet side, a chromium metal layer and a hydrous chromium oxide layer. The chromium metal layer is deposited in an amount of 50-200 mg/m2, and the hydrous chromium oxide layer is deposited in an amount of 3-15 mg/m2 in terms of chromium. The chromium metal layer includes: a flat chromium metal layer that has a thickness of at least 7 nm; and a granular chromium metal layer that includes granular protrusions that are formed on the surface of the flat chromium metal layer. The maximum grain size of the granular protrusions is 150 nm or smaller. The number density of the granular protrusions per unit area is 10/?m2 or higher.Type: ApplicationFiled: December 1, 2016Publication date: December 20, 2018Applicant: JFE Steel CorporationInventors: Yusuke Nakagawa, Takeshi Suzuki, Mikito Suto, Katsumi Kojima, Yuya Baba
-
Publication number: 20180355496Abstract: A steel sheet for cans has, on the surface thereof, in order from the steel sheet side, a chromium metal layer and a hydrous chromium oxide layer. The chromium metal layer is deposited in an amount of 65-200 mg/m2, and the hydrous chromium oxide layer is deposited in an amount of 3-15 mg/m2 in terms of chromium. The chromium metal layer includes: a flat chromium metal layer that has a thickness of at least 7 nm; and a granular chromium metal layer that includes granular protrusions that are formed on the surface of the flat chromium metal layer. The maximum grain size of the granular protrusions is 100 nm or smaller. The number density of the granular protrusions per unit area is 10/?m2 or higher.Type: ApplicationFiled: December 1, 2016Publication date: December 13, 2018Inventors: Yusuke Nakagawa, Takeshi Suzuki, Mikito Suto, Katsumi Kojima, Yuya Baba
-
Patent number: 10144985Abstract: A steel sheet exhibiting good drawability and excellent buckling strength of a can body portion against an external pressure, and a method for manufacturing the same. The steel sheet includes C: 0.0030% or more and 0.0100% or less, Si: 0.05% or less, Mn: 0.10% or more and 1.0% or less, P: 0.030% or less, S: 0.020% or less, Al: 0.010% or more and 0.100% or less, N: 0.0050% or less, Nb: 0.010% or more and 0.050% or less, and incidental impurities. Contents of C and Nb satisfy 0.10?([Nb]/92.9)/([C]/12)<0.60, the HR30T hardness of the steel sheet is 56 or more, and the average Young's modulus of the steel sheet is 210 GPa or more.Type: GrantFiled: July 8, 2014Date of Patent: December 4, 2018Assignee: JFE STEEL CORPORATIONInventors: Hayato Saito, Yusuke Nakagawa, Katsumi Kojima, Hiroki Nakamaru
-
Publication number: 20180112295Abstract: A steel sheet for can lids contains, in mass %, 0.020-0.060% of C, 0.01-0.05% of Si, 0.20-0.60% of Mn, 0.001-0.100% of P, 0.008-0.020% of S, 0.0130-0.0190% of N, and from 0.005% to {?4.20×N+0.110}% of Al, with Mnf being 0.30% to 0.58% (inclusive), where Mnf=Mn?1.7×S, and with the balance made up of Fe and unavoidable impurities. The lower yield strength YP (N/mm2) and the yield point elongation YPEl (%) of this steel sheet for can lids after an aging treatment at 210° C. for 10 minutes satisfy YP?355, YPEl?2, YPEl?(60/(YP?355))+2 and YP?4.09×YPEl+476. A method for producing this steel sheet for can lids.Type: ApplicationFiled: March 28, 2016Publication date: April 26, 2018Applicant: JFE STEEL CORPORATIONInventors: Katsumi Kojima, Tomonari Hiraguchi, Takumi Tanaka, Hiroki Nakamaru
-
Publication number: 20180051362Abstract: Provided are a steel sheet, having sufficient strength and formability regardless of reduction of thickness, for crown caps; a method for manufacturing the same; and a crown cap. The steel sheet for crown caps has a composition containing C: 0.0010% to less than 0.0050%, Si: 0.10% or less, Mn: 0.05% to less than 0.50%, P: 0.050% or less, S: 0.050% or less, Al: more than 0.002% to less than 0.070%, N: less than 0.0040%, and B: 0.0005% to 0.0020% on a mass basis, the balance being Fe and inevitable impurities, and also has a yield strength of 500 MPa or more in a rolling direction, an average Lankford value (r) of 1.1 or more, and an in-plane anisotropy (?r) of Lankford value of ?0.3 to 0.3.Type: ApplicationFiled: January 27, 2016Publication date: February 22, 2018Applicant: JFE STEEL CORPORATIONInventors: Takumi TANAKA, Tomonari HIRAGUCHI, Katsumi KOJIMA, Hiroki NAKAMARU, Nobusuke KARIYA
-
Patent number: 9879332Abstract: A method of manufacturing a high-strength steel sheet includes, on a mass percent basis, 0.03%-0.10% C, 0.01%-0.5% Si, 0.001%-0.100% P, 0.001%-0.020% S, 0.01%-0.10% Al, 0.005%-0.012% N, the balance being Fe and incidental impurities, and microstructures that do not contain a pearlite microstructure, wherein, when Mnf=Mn [% by mass]?1.71×S [% by mass], Mnf is 0.3 to 0.6, including: forming a slab by vertical-bending type continuous casting or bow type continuous casting, wherein surface temperature of a slab corner in a region where the slab undergoes bending deformation or unbending deformation is 800° C. or lower, or 900° C. or higher; forming a steel sheet by hot-rolling the slab followed by cold rolling; annealing the steel sheet after the cold rolling; and skinpass rolling at a draft of 3% or less after the annealing.Type: GrantFiled: September 16, 2014Date of Patent: January 30, 2018Assignee: JFE Steel CorporationInventors: Takumi Tanaka, Katsumi Kojima, Makoto Aratani, Hiroki Iwasa
-
Publication number: 20170335438Abstract: A steel sheet for a crown cap has sufficient strength and formability even when the thickness thereof is reduced for use, and has a composition containing, in percent by mass, C: 0.010% to 0.025%, Si: 0.10% or less, Mn: 0.05% to 0.50%, P: 0.050% or less, S: 0.005% to 0.050%, Al: 0.020% to 0.070%, N: less than 0.0040%, and the balance being Fe and inevitable impurities, wherein yield strength after heat treatment at 210° C. for 15 minutes is as follows: the yield strength is 550 MPa or more in a rolling direction, and the yield strength in a direction 45° from the rolling direction in a rolling plane is equal to or less than the average of the yield strength in the rolling direction and the yield strength in a direction 90° from the rolling direction in the rolling plane.Type: ApplicationFiled: November 19, 2015Publication date: November 23, 2017Inventors: Takumi Tanaka, Tomonari Hiraguchi, Katsumi Kojima, Hiroki Nakamaru, Nobusuke Kariya
-
Publication number: 20170314095Abstract: A steel sheet for cans has a chemical composition containing, by mass %, C: 0.015% or more and 0.150% or less, Si: 0.04% or less, Mn: 1.0% or more and 2.0% or less, P: 0.025% or less, S: 0.015% or less, Al: 0.01% or more and 0.10% or less, N: 0.0005% or more and less than 0.0050%, Ti: 0.003% or more and 0.015% or less, B: 0.0010% or more and 0.0040% or less, and the balance being Fe and inevitable impurities. The steel sheet has a microstructure including a ferrite phase as a main phase and at least one of a martensite phase and a retained austenite phase as a second phase, the total area fraction of the second phase being 1.0% or more, and the sheet has a tensile strength of 480 MPa or more, a total elongation of 12% or more, and a yield elongation of 2.0% or less.Type: ApplicationFiled: October 13, 2015Publication date: November 2, 2017Applicant: JFE STEEL CORPORATIONInventors: Hayato SAITO, Katsumi KOJIMA, Hiroki NAKAMARU
-
Publication number: 20170306436Abstract: A steel sheet for two-piece cans is suitable not only for drawing and ironing, but also for forming beads or geometric shapes on a can body and can be preferably used to form a special-shaped two-piece can. The steel sheet for two-piece cans contains, in mass %, C: 0.020% to 0.080%, Si: 0.04% or less, Mn: 0.10% to 0.60%, P: 0.02% or less, S: 0.015% or less, Al: 0.010% to 0.100%, and N: 0.0005% to 0.0030%, the balance being Fe and unavoidable impurities. The steel sheet has a tensile strength of 480 MPa or more, an elongation of 7% or more, a yield elongation of 3% or less, and a ferrite grain size of less than 6 ?m.Type: ApplicationFiled: September 18, 2015Publication date: October 26, 2017Inventors: Hayato Saito, Katsumi Kojima, Hiroki Nakamaru
-
Publication number: 20170292176Abstract: A steel sheet for a crown cap having sufficient strength and formability suitable for forming crown caps even when reduced in gauge, and a method for producing the steel sheet for a crown cap. The steel sheet for a crown cap having a composition that includes, in terms of % by mass: C: 0.002% or more and 0.010% or less, Si: 0.05% or less, Mn: 0.05% or more and 0.30% or less, P: 0.030% or less, S: 0.020% or less, Al: less than 0.0100%, N: 0.0050% or less, and the balance being Fe and unavoidable impurities. The C content is more than 0.003% when the Al content is 0.005% or more. The yield strength in the rolling direction is 500 MPa or more. The average Lankford value is 1.3 or more.Type: ApplicationFiled: October 8, 2015Publication date: October 12, 2017Applicant: JFE STEEL CORPORATIONInventors: Masami TSUJIMOTO, Takumi TANAKA, Tomonari HIRAGUCHI, Katsumi KOJIMA, Makoto ARATANI, Reiko SUGIHARA, Fumio AOKI, Toshihiro KIKUCHI, Hiroki NAKAMARU
-
Publication number: 20170198369Abstract: A can steel plate includes: equal or less than 0.0030% by mass of C; equal or less than 0.02% by mass of Si; 0.05-0.60% by mass of Mn; equal or less than 0.020% by mass of P; equal or less than 0.020% by mass of S; 0.010% to 0.100% by mass of Al; 0.0010-0.0050% by mass of N; 0.001-0.050% by mass of Nb; and balance Fe and impurities. Intensity of (111) [1-21] orientation (where ?2 represents 2 with bar in Miller indices) and intensity of (111)[1-10] orientation (where ?1 represents 1 with bar in Miller indices) satisfy the following equation (1), and in a rolling direction and 90° direction from the rolling direction in a horizontal plane, tensile strength TS (MPa) and fracture elongation El (%) satisfy relations of the following equations (2) and (3). (Intensity of (111) [1-21] orientation)/(Intensity of (111) [1-10] orientation)>0.9 . . . (1), TS>550 . . . (2), El>?0.02×TS+17.5 . . . (3).Type: ApplicationFiled: May 11, 2015Publication date: July 13, 2017Applicants: JFE STEEL CORPORATION, THYSSENKRUPP RASSELSTEIN GMBHInventors: Takumi TANAKA, Yusuke NAKAGAWA, Masaki TADA, Katsumi KOJIMA, Hiroki NAKAMARU, Kathleen STEIN-FECHNER, Burkhard KAUP
-
Patent number: 9669961Abstract: A three-piece can includes a can body obtained by forming a steel sheet such that a roundness of the can is 0.34 mm or less. The steel sheet contains: by mass %, C: 0.020% or more and 0.100% or less; Si: 0.10% or less; Mn: 0.10% or more and 0.80% or less; P: 0.001% or more and 0.100% or less; S: 0.001% or more and 0.020% or less; Al: 0.005% or more and 0.100% or less; and N: 0.0130% or more and 0.0200% or less. The balance is Fe and inevitable impurities. The steel sheet has a yield strength of 440 MPa or more and a total elongation of 12% or more.Type: GrantFiled: June 3, 2013Date of Patent: June 6, 2017Assignee: JFE Steel CorporationInventors: Masaki Tada, Katsumi Kojima, Hiroki Nakamaru, Yoichi Tobiyama
-
Publication number: 20170107592Abstract: A steel sheet for a can having sufficient hardness and a method for manufacturing the steel sheet. The steel sheet has a chemical composition containing, by mass %, C: 0.0005% or more and 0.0030% or less, Si: 0.05% or less, Mn: 0.50% or more and 1.00% or less, P: 0.030% or less, S: 0.020% or less, Al: 0.01% or more and 0.04% or less, N: 0.0010% or more and 0.0050% or less, B: 0.0005% or more and 0.0050% or less, and Fe and inevitable impurities. Additionally, the steel sheet has a hardness (HR30T) of 56 or more and an average Young's modulus of 215 GPa or more.Type: ApplicationFiled: March 23, 2015Publication date: April 20, 2017Applicant: JFE STEEL CORPORATIONInventors: Hayato SAITO, Mikito SUTO, Katsumi KOJIMA, Hiroki NAKAMARU
-
Publication number: 20170051376Abstract: Provided are a high-strength steel sheet for containers and a method for producing the high-strength steel sheet. The high-strength steel sheet for containers has a composition containing, by mass, C: 0.0010% to 0.10%, Si: 0.04% or less, Mn: 0.10% to 0.80%, P: 0.007% to 0.100%, S: 0.10% or less, Al: 0.001% to 0.100%, N: 0.0010% to 0.0250%, and the balance being Fe and inevitable impurities. The difference between the dislocation density at the uppermost layer of the high-strength steel sheet in the thickness direction and the dislocation density at a depth of ¼ of the thickness of the high-strength steel sheet from the surface is 1.94×1014 m?2 or less. The high-strength steel sheet has a tensile strength of 400 MPa or more and a fracture elongation of 10% or more.Type: ApplicationFiled: April 23, 2015Publication date: February 23, 2017Applicant: JFE STEEL CORPORATIONInventors: Masaki Tada, Hayato Saito, Katsumi Kojima, Hiroki Nakamaru
-
Publication number: 20170051377Abstract: A high-strength steel sheet having good formability and methods for manufacturing. The high-strength steel sheet has a chemical composition including, in mass %, C: 0.010% to 0.080%, Si: 0.05% or less, Mn: 0.10% to 0.70%, P: 0.03% or less, S: 0.020% or less, Al: 0.005% to 0.070% and N: 0.0120% to 0.0180%, the balance being Fe and inevitable impurities. A content of nitrogen in the form of solute nitrogen is 0.0100% or more, average ferrite grain size of the steel sheet is 7.0 ?m or less, the density of dislocations at a depth of 1/4 sheet thickness from the surface of the steel sheet is 4.0×1014 m?2 to 2.0×1015 m?2, and the tensile strength and the elongation in the transverse direction, perpendicular to the rolling direction, after aging treatment is 530 MPa or more and 7% or more respectively.Type: ApplicationFiled: April 22, 2015Publication date: February 23, 2017Applicant: JFE STEEL CORPORATIONInventors: Hayato SAITO, Katsumi KOJIMA, Masaki TADA, Hiroki NAKAMARU