586 patents
Page 27 of 30
Utility
High-strength hot-dip galvanized steel sheet
6 Jan 20
A high-strength hot-dip galvanized steel sheet that is a steel sheet that includes major components and that contains at least 40 vol. % the sum of bainite and martensite, 8-60 vol. % retained austenite, and less than 40 vol. % ferrite, with the remainder comprising an incidental structure.
Shintaro Yamanaka, Soshi Fujita, Koichi Sato
Filed: 27 Sep 12
Utility
Shape measurement apparatus and shape measurement method
6 Jan 20
Toshio Akagi, Yusuke Konno, Atsuhiro Hibi, Nobuhiro Furuya, Takayuki Sonoda, Akihito Nakazaki
Filed: 18 Jan 17
Utility
Joint
30 Dec 19
A joint provided with a base part 12, a pair of side parts 14, 14 extending from the two end parts of the base part 12 in the first direction D1 to the same side in the second direction D2 vertical to the first direction D1, the pair of side parts 14, 14 being formed with fastening holes 14H at the center in a third direction D3 vertical to both the first direction D1 and second direction D2, and a closed part 16 formed between the pair of side parts 14, 14 as an extended region of the base part 12 and pair of side parts 14, 14 at least at one end in the third direction D3.
Takahiro Aitoh, Takeshi Kawachi
Filed: 6 Oct 15
Utility
Tubular connection with self-locking threading used in the oil industry
30 Dec 19
A threaded connection includes first and second tubular components, each including a respective male and female end.
Pierre Martin, Eric Verger
Filed: 6 Dec 09
Utility
Electrical steel sheet
30 Dec 19
An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2).
Shuichi Yamazaki, Masaru Takahashi, Kazutoshi Takeda, Hiroyasu Fujii, Koji Kanehashi
Filed: 21 Dec 15
Utility
High Cr-based austenitic stainless steel
30 Dec 19
A high Cr austenitic stainless steel with a chemical composition consisting of in terms of % by mass, 0.03 to 0.12% of C, 0.10 to 1.00% of Si, 0.10 to 3.00% of Mn, 0.030% or less of P, 0.020% or less of S, 21.50 to 28.00% of Cr, more than 26.00 and not more than 35.00% of Ni, more than 2.00 and not more than 5.00% of W, 0.80% or less of Co, 0.01 to 0.70% of V, 0.15 to 1.00% of Nb, 0.001 to 0.040% of Al, 0.0001 to 0.0100% of B, 0.010 to 0.400% of N, 0.001 to 0.200% of Zr, 0.001 to 0.200% of Nd, 0.001 to 0.200% of Ta, 0.020 to 0.200% of Ta+0.8Nd+0.5Zr, 0.025% or less of Ti+Sn+Sb+Pb+As+Bi, 0.0090% or less of O, and a remainder consisting of Fe and impurities.
Atsuro Iseda, Hiroyuki Semba, Hirokazu Okada, Hiroyuki Hirata, Toshihide Ono, Katsuki Tanaka, Tomoaki Hamaguchi, Kana Jotoku
Filed: 2 Jun 16
Utility
High-strength steel material for oil well and oil country tubular goods
23 Dec 19
There is provided a high-strength steel material for oil well having a chemical composition consisting, by mass percent, of C: 0.70-1.8%, Si: 0.05-1.00%, Mn: 12.0-25.0%, Al: 0.003-0.06%, P: ≤0.03%, S: ≤0.03%, N: ≤0.10%, V: >0.5% and ≤2.0%, Cr: 0-2.0%, Mo: 0-3.0%, Cu: 0-1.5%, Ni: 0-1.5%, Nb: 0-0.5%, Ta: 0-0.5%, Ti: 0-0.5%, Zr: 0-0.5%, Ca: 0-0.005%, Mg: 0-0.005%, B: 0-0.015%, the balance: Fe and impurities, satisfying [0.6≤C-0.18V-0.06Cr<1.44], wherein a metal micro-structure is consisting essentially of an austenite single phase, V carbides having circle equivalent diameters of 5 to 100 nm exist at a number density of 20 pieces/μm2 or higher, and a yield strength is 654 MPa or higher.
Kenji Kobayashi, Yusaku Tomio
Filed: 27 Sep 15
Utility
Hot-rolled steel sheet and production method of therefor
23 Dec 19
A hot-rolled steel sheet has predetermined chemical composition, a sum of a Si content and an Al content is higher than 0.20% and lower than 0.81%, a microstructure includes, by area fraction, 90% to 99% of a ferrite, 1% to 10% of a martensite, and a bainite limited to 5% or less, the grain size of the martensite is 1 to 10 μm, the X-ray random intensity ratio of a {211}<011> orientation which is parallel to a rolled surface of the steel sheet and is parallel to a rolling direction is 3.0 or less.
Takeshi Toyoda, Riki Okamoto, Ryohta Niiya, Hiroshi Sakai, Hidetoshi Shindo
Filed: 27 May 14
Utility
Metal pipe having thickened end portion, and method of manufacturing same
23 Dec 19
A metal pipe having a thickened end portion, the metal pipe includes: when viewed in a longitudinal direction of the metal pipe, a thin portion which has a thickness t0; a first thickened portion which is provided on one end and has a thickness T which is larger than the thickness t0; and a first taper portion which is provided between the thin portion and the first thickened portion and has the thickness which gradually increases from t0 to T; when a hardness of an inner surface of the first thickened portion is measured in a circumferential direction and the hardness is plotted with respect to a position in the circumferential direction, in which a waveform representing a high hardness portion having a hardness which is 95% or more of a maximum hardness in the circumferential direction and a waveform representing a low hardness portion having a hardness which is less than 95% of the maximum hardness alternately appear, and a plurality of combinations of the waveform representing the high hardness portion and the waveform representing the low hardness portion appear.
Hiroaki Kubota, Masaaki Mizumura
Filed: 17 Feb 16
Utility
Water removing apparatus and water removing method for steel sheet cooling water in hot rolling process
23 Dec 19
A plurality of water removing nozzles of a water removing apparatus comprise one or more of a single far water removing nozzle and a far water removing nozzle group.
Yoshihiro Serizawa, Shinsuke Kai
Filed: 16 Jun 15
Utility
Method for continuously casting steel
23 Dec 19
Masahito Hanao, Hiroaki Uchiyama, Kohei Fujimoto, Masatoshi Miyahara
Filed: 23 Jan 19
Utility
Hot-dip galvanized steel sheet
16 Dec 19
A hot-dip galvanized steel sheet wherein the hot-dip galvanized steel sheet comprises a base steel sheet and a hot-dip galvanized layer, a ferrite phase is, by volume fraction, 40% or more and 97% or less in a range of ⅛ thickness to ⅜ thickness centered at a position of ¼ thickness from the surface of the base steel sheet, a hard structure is 3% or more in total, wherein the hot-dip galvanized steel sheet has the hot-dip galvanized layer in which Fe is 5.0% or less and Al is 1.0% or less, and columnar grains formed of a ζ phase is 20% or more in an entire interface between the plated layer and the base steel sheet on the surface of the base steel sheet in which a ratio of a volume fraction of the hard structure in a surface layer range of 20 μm depth in a steel sheet direction from an interface between the hot-dip galvanized layer and the base steel sheet is 0.10 times or more to 0.90 times or less of a volume fraction of the hard structure in the range of ⅛ thickness to ⅜ thickness, and wherein the hot-dip galvanized steel sheet has a refined layer at the side of the interface in the base steel sheet, and wherein an average thickness of the refined layer, an average grain size of ferrite in the refined layer and a maximum size of the oxide included in the refined layer are defined respectively.
Hiroyuki Kawata, Takeshi Yasui, Kohei Ueda, Naoki Maruyama, Yuji Yamaguchi, Satoshi Uchida, Ryosuke Komami, Hayato Arai, Yasuhiro Nakashima, Toyomitsu Nakamura
Filed: 4 Nov 15
Utility
Line displacement evaluation method, line displacement evaluation device, program, and recording medium
16 Dec 19
Provided is a line displacement evaluation method of evaluating line displacement occurring in a press-formed article in press forming of forming a character line.
Masahiro Saito, Tohru Yoshida
Filed: 5 Aug 15
Utility
Structure design support device, structure design support method, program, and recording medium
16 Dec 19
A structure design support device includes: an evaluation point information acquisition unit which acquires evaluation point information representing a position in a first state and a position in a second state, of an evaluation point provided in a structure which is configured of a plurality of parts, and a part to which the evaluation point belongs, among the plurality of parts; and an evaluation value calculation unit which calculates an evaluation value representing the magnitude of a change between the first state and the second state, of a positional relationship between a first evaluation point belonging to a first part and a second evaluation point belonging to a second part different from the first part to which the first evaluation point belongs, by using the evaluation point information acquired in the evaluation point information acquisition unit.
Yusuke Tsunemi, Takeshi Kawachi, Atsushi Yamazaki
Filed: 20 Aug 15
Utility
Steel product and manufacturing method of the same
16 Dec 19
A steel product has: a chemical composition represented by, in mass %, C: 0.050% to 0.35%, Si: 0.50% to 3.0%, Mn: exceeding 3.0% to 7.5% or less, P: 0.05% or less, S: 0.01% or less, sol.
Koutarou Hayashi
Filed: 16 Jul 15
Utility
Quasicrystal-containing plated steel sheet and method for producing quasicrystal-containing plated steel sheet
16 Dec 19
A quasicrystal-containing plated steel sheet including: a plating layer positioned on at least one surface of a steel sheet; and an alloy layer positioned at an interface between the plating layer and the steel sheet and composed of an Al—Fe intermetallic compound.
Kohei Tokuda
Filed: 4 Sep 14
Utility
Electron-beam welded joint, steel for electron-beam welding, and method of manufacturing the same
9 Dec 19
Ryuichi Honma, Ryuji Uemori, Tadashi Ishikawa, Akihiko Kojima, Manabu Hoshino
Filed: 26 Oct 11
Utility
Arc spot welding method and welding apparatus for working the same
9 Dec 19
An arc spot welding method able to give a predetermined weld bead diameter or excess metal height in a back surface weld bead of arc spot welding and able to give a welded joint excellent in both strengths of TSS and CTS and a welding apparatus for working the same are provided.
Shinji Kodama, Seiji Furusako, Yasunobu Miyazaki
Filed: 5 Oct 15
Utility
Plated steel sheet
9 Dec 19
A base material (13) included in a plated steel sheet (1) includes a structure, at a ¼ sheet thickness position, represented by, in volume fraction: tempered martensite: 3.0% or more; ferrite: 4.0% or more; and retained austenite: 5.0% or more.
Koutarou Hayashi, Akihiro Uenishi, Masaharu Kameda, Jun Haga, Kunio Hayashi, Kohichi Sano, Hiroyuki Kawata
Filed: 21 Apr 16
Utility
Cooling device for hot-dip plated steel sheet
9 Dec 19
The present invention provides a cooling device for a hot-dip plating device provided on an upper side of a plating thickness control device in a conveyance route of a hot-dip plated steel sheet that is conveyed from a plating bath in a vertically upward direction.
Tooru Oohashi, Kazuki Machida, Hiroshi Nakata, Katsuya Kojima, Kohhei Hayakawa
Filed: 23 Oct 14