586 patents
Page 21 of 30
Utility
Steel wire and wire rod
6 Jul 20
A predetermined composition is had, when a C content is represented by (C %), in a case of (C %) being not less than 0.35% nor more than 0.65%, a volume fraction of pearlite is 64×(C %)+52% or more, and in a case of (C %) being greater than 0.65% and 0.85% or less, the volume fraction of pearlite is not less than 94% nor more than 100%, and a structure of the other portion is composed of one or two of proeutectoid ferrite and bainite.
Makoto Okonogi, Shingo Yamasaki, Akifumi Kawana, Hideaki Gotohda
Filed: 10 Aug 11
Utility
Continuous hot-dip metal plating device and continuous hot-dip metal plating method
6 Jul 20
A continuous hot-dip plating machine includes: a sink roll provided in a plating bath and configured to upwardly change a transfer direction of the steel strip; a first support roll provided in the plating bath and located above the sink roll, the first support roll being in contact with a first surface of the steel strip in contact with the sink roll; and a second support roll provided in the plating bath and located above the first support roll, the second support roll being in contact with a second surface of the steel strip opposite the first surface.
Koichi Nishizawa, Masaaki Omodaka
Filed: 23 Mar 17
Utility
High-strength hot-dip galvanized steel sheet excellent in impact peeling resistance and worked portion corrosion resistance
6 Jul 20
A high-strength hot-dip galvanized steel sheet excellent in impact resistance and worked portion corrosion resistance including a hot-dip galvanized plating layer on a steel sheet base material whose tensile strength is 590 MPa or more, wherein the plating layer includes projecting alloy layers being in contact with the steel sheet base material, a number density of the projecting alloy layers is 4 pieces/mm or more, wherein the steel sheet base material includes: a miniaturized layer being directly in contact with the interface between the steel sheet base material and the plating layer; a decarburized layer being in contact with the miniaturized layer; and an inner layer other than the miniaturized layer and the decarburized layer, and one or more kinds of oxides of Si and Mn are contained in layers of the miniaturized layer, the decarburized layer, and the projecting alloy layers.
Takeshi Yasui, Hiroyuki Kawata, Yuji Yamaguchi, Ryosuke Komami, Satoshi Uchida, Akinobu Murasato
Filed: 24 Feb 16
Utility
Electrical steel sheet and method for producing electrical steel sheet
6 Jul 20
An electrical steel sheet has an insulation coating on a steel sheet surface.
Kazutoshi Takeda, Hiroyasu Fujii, Masaru Takahashi, Shuichi Yamazaki, Hiroki Hori
Filed: 14 Feb 16
Utility
Press-formed product and method for designing the same
29 Jun 20
A press-formed product is shaped by press-working from a tailored blank made up of a plurality of metal sheets butt-welded together.
Masahiro Saito, Yoshiaki Nakazawa, Kenichiro Otsuka, Yasuhiro Ito, Masanori Yasuyama, Masatoshi Tokunaga
Filed: 9 May 16
Utility
Method for manufacturing press-formed product, device for manufacturing press-formed product, mandrel, and press-formed product
29 Jun 20
A method for manufacturing a press-formed product includes: a first step of preparing a long material having a bending portion; and a second step of decreasing curvature of the bending portion while restricting both ends of the long material in a longitudinal direction.
Jun Nitta, Tohru Yoshida, Hiroshi Yoshida, Nobuo Yoshikawa, Shigeru Yonemura
Filed: 2 Mar 15
Utility
Steel sheet for a fuel tank
29 Jun 20
A steel sheet for a fuel tank according to the present invention includes: a Zn—Ni alloy plated layer placed on one surface or each of both surfaces of a base metal; and a chromate-free chemical conversion coating film which is placed over the Zn—Ni alloy plated layer.
Kiyokazu Ishizuka, Noriyuki Maekawa, Hiroaki Uramoto, Masahiro Fuda, Ikuro Yamaoka, Kenichiro Matsumura
Filed: 31 Jan 16
Utility
Laser welded joint, vehicle component, manufacturing method of laser welded joint, and manufacturing method of vehicle component
29 Jun 20
A laser welded joint has weld metal provided between a plurality of steel sheets.
Naoki Maruyama, Yasuaki Naito, Shigeru Yonemura, Yasunobu Miyazaki, Takuya Kuwayama
Filed: 18 Nov 15
Utility
Eddy current heat generating apparatus
29 Jun 20
The disclosed heat generating apparatus includes: a rotary shaft, a heat generator, a plurality of permanent magnets, a magnet holder, and a heat recovery system.
Hiroyuki Yamaguchi, Atsushi Seto, Kenji Imanishi, Hiroshi Nogami
Filed: 4 Nov 15
Utility
Hat-shaped cross-section component manufacturing method
22 Jun 20
A method for manufacturing a hat-shaped cross-section component includes a gripping process, a bending and stretching process, and a bend back process.
Toshimitsu Aso, Yasuharu Tanaka, Takashi Miyagi, Misao Ogawa, Shinobu Yamamoto
Filed: 17 Dec 15
Utility
Welded structure member and manufacturing method thereof
22 Jun 20
This welded structure member includes a base metal member including a first surface and a second surface; a joined metal member including an abutting surface of which an end surface abuts onto the first surface; a weld bead which is formed on the first surface; and a weld overlay section which is formed on the second surface of the base metal member, in which the weld bead includes a weld bead end section in a position which is separated to the front of the abutting end section.
Masahiro Ogawa, Shoko Oami, Shinji Kodama
Filed: 1 Oct 15
Utility
Steel sheet for a fuel tank
22 Jun 20
A steel sheet for a fuel tank includes: a Zn—Ni alloy plated layer which is placed on one surface or each of both surfaces of a base metal and formed on at least one surface; and an inorganic chromate-free chemical conversion coating film which is placed over the Zn—Ni alloy plated layer.
Kiyokazu Ishizuka, Noriyuki Maekawa, Hiroaki Uramoto, Masahiro Fuda, Ikuro Yamaoka, Kenichiro Matsumura
Filed: 30 Nov 16
Utility
Hot-rolled steel sheet
22 Jun 20
A hot-rolled steel sheet includes a chemical composition represented by, in mass %, C: 0.010% to 0.100%, Si: 0.30% or less, Cr: 0.05% to 1.00%, Nb: 0.003% to 0.050%, Ti: 0.003% to 0.200% and others, wherein a proportion of grains having an intragranular misorientation of 5° to 14° in all grains is 20% or more by area ratio, the grain being defined as an area which is surrounded by a boundary having a misorientation of 15° or more and has a circle-equivalent diameter of 0.3 μm or more.
Masayuki Wakita, Mitsuru Yoshida, Natsuko Sugiura, Hiroshi Shuto, Tatsuo Yokoi
Filed: 24 Feb 15
Utility
Steel sheet with strain induced transformation type composite structure and method of manufacturing same
22 Jun 20
There is provided a steel sheet with strain induced transformation type composite structure having a predetermined chemical composition in which a microstructure at the ¼ thickness of the steel sheet includes, by area ratio, 50% to 85% of a polygonal ferrite, 3% to 10% of a residual austenite, 5% to 47% of bainite and 1% or less of a fresh martensite and a tempered martensite in total and satisfies the equation of 0.01<Ex.C/fsd≤0.015, the microstructure includes 1×1016 pieces/cm3 or more of precipitates containing TiC, an average grain diameter of the residual austenite 1.0 μm to 5.0 μm at an equivalent circle diameter, an average of closest distances of the austenite is 3.0 μm to 10.0 μm, and an average diameter of the precipitates is 3 nm or less.
Tatsuo Yokoi, Hiroshi Shuto, Yuuki Kanzawa, Natsuko Sugiura
Filed: 30 Jul 15
Utility
Press forming apparatus and press forming method
15 Jun 20
A press forming apparatus includes: a punch; a blank holder disposed adjacent to the punch; a die being a counterpart of the punch; and a pad disposed to face the punch.
Ryuichi Nishimura, Kenichiro Otsuka, Keiji Ogawa, Yoshiaki Nakazawa
Filed: 26 Jun 14
Utility
Panel-like formed product, vehicle door, and method for manufacturing a panel-like formed product
15 Jun 20
The panel-like formed product includes a polygonal top board, two or more vertical walls, and a flange.
Kenichiro Otsuka, Yoshiaki Nakazawa, Takeshi Kawachi, Yoshiyuki Kaseda
Filed: 26 Jan 17
Utility
Grain-oriented electrical steel sheet
8 Jun 20
Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed.
Tatsuhiko Sakai, Hideyuki Hamamura, Hisashi Mogi, Fumiaki Takahashi
Filed: 18 Apr 16
Utility
Method of manufacturing mechanical part and mechanical part
8 Jun 20
A method of manufacturing a mechanical part of the present invention includes a first process of forming, by performing a folding processing to an end portion of the material, a portion to be processed having a structure, in which a plurality of layers respectively having a thickness corresponding to a plate thickness of a material overlap each other, in the material such that a plate thickness direction of the layer is orthogonal to a plate thickness direction of the material; and a second process of changing, by performing a forging processing to the portion to be processed, a shape of the portion to be processed to a target shape while press-welding the layers of the portion to be processed to each other by plastic deformation.
Mitsuharu Yamagata, Shuji Yamamoto, Yasuhiro Wada
Filed: 6 Jan 16
Utility
Spot welding electrode and welding apparatus and welding method using same
1 Jun 20
A spot welding electrode of a donut-shaped electrode wherein even when a welded member of a steel sheet is slanted with respect a plane perpendicular to an axis of the spot welding electrode, a cross tensile strength (CTS) of the spot welded joint can be improved.
Fuminori Watanabe, Tohru Okada, Seiji Furusako
Filed: 4 Dec 14
Utility
Method of manufacturing grain-oriented electrical steel sheet
1 Jun 20
Provided is a method of manufacturing a grain-oriented electrical steel sheet including: a heating process of heating a slab having a predetermined chemical composition at T1° C. of 1150° C. to 1300° C., retaining the slab for 5 minutes to 30 hours, lowering the temperature of the slab to T2° C. of T1−50° C. or lower, heating the slab at T3° C. of 1280° C. to 1450° C., and retaining the slab for 5 minutes to 60 minutes; a hot-rolling process of hot-rolling the slab that is heated to obtain a hot-rolled steel sheet; a cold-rolling process; an intermediate annealing process of performing intermediate annealing with respect to the hot-rolled steel sheet at least one time before the cold-rolling process or before a final pass of the cold-rolling process after interrupting the cold-rolling; an annealing separating agent applying process; and a secondary film applying process.
Hirotoshi Tada, Nobusato Morishige, Naoto Masumitsu, Junichi Takaobushi, Shin Furutaku, Masaru Takahashi
Filed: 31 Mar 16