1279 patents
Utility
Hot-dip galvanized steel sheet
30 Aug 22
In a thickness range of which center is a ¼ thickness from the surface of a base steel sheet, a volume fraction of a ferrite phase is 0% to less than 50%, a volume fraction of the total of a hard structure composed of one or more of a bainite structure, a bainitic ferrite phase, a fresh martensite phase, and a tempered martensite phase is 50% or more, a volume fraction of a retained austenite phase is 0-8%, and a volume fraction of the total of a pearlite phase and a coarse cementite phase is 0-8%, at an interface between a plating layer and the base steel sheet, a Fe—Al alloy layer is provided, the Fe—Al alloy layer having an average thickness of 0.1-2.0 μm and a difference between a maximum thickness and a minimum thickness in the width direction of the steel sheet being within 0.5 μm.
Atsushi Morishita, Taihei Kaneto, Satoshi Uchida, Tatsuya Nakada, Yuji Yamaguchi
Filed: 31 Jul 17
Utility
Coated steel member, coated steel sheet, and methods for manufacturing same
30 Aug 22
The present invention has as its object the provision of a coated steel member and coated steel sheet excellent in hydrogen embrittlement resistance in a corrosive environment and methods for manufacturing the same.
Shinichiro Tabata
Filed: 5 Feb 20
Utility
Tubular body inner surface inspection apparatus and tubular body inner surface inspection method
30 Aug 22
There is provided a tubular body inner surface inspection apparatus that detects a defect existing on an inner surface of a tubular body, the apparatus including: a tubular body imaging apparatus including N (N≥2) imaging units each including a laser light source that applies laser light, an optical element that reflects laser light applied from the laser light source in a circumferential direction of the inner surface of the tubular body, as annular laser light, an area camera that images a region of the inner surface of the tubular body where the annular laser light is applied, and thereby generates an annular beam image, and a linking member that links together and fixes the laser light source and the area camera, in which the imaging units are linked in series along a tube axial direction of the tubular body in such a manner that positions of the linking members in a plane orthogonal to a tube axis are different from each other; a movement apparatus that moves the tubular body imaging apparatus along the tube axial direction of the tubular body; and an arithmetic processing apparatus that, while moving the tubular body imaging apparatus by means of the movement apparatus, performs image processing on a plurality of annular beam images generated in each of the imaging units and assesses whether a defect exists on the inner surface of the tubular body or not.
Toshio Akagi, Hironao Yamaji, Takeo Nakata, Masaki Yamano
Filed: 30 Jul 18
Utility
Steel sheet
30 Aug 22
A steel sheet includes a predetermined chemical composition and a metal structure represented by, in area fraction, ferrite: 50% to 95%, granular bainite: 5% to 48%, tempered martensite: 2% to 30%, upper bainite, lower bainite, fresh martensite, retained austenite, and pearlite: 5% or less in total, and the product of the area fraction of the tempered martensite and a Vickers hardness of the tempered martensite: 800 to 10500.
Katsuya Nakano, Kunio Hayashi, Yuri Toda, Eisaku Sakurada, Akihiro Uenishi
Filed: 31 Jan 17
Utility
Steel Sheet
25 Aug 22
Katsuya NAKANO, Kengo TAKEDA, Hiroyuki KAWATA, Akihiro UENISHI, Yuya SUZUKI
Filed: 26 Jun 20
Utility
Front axle beam and production method thereof
23 Aug 22
In a pressing step, a first forged product is pressed by a first die, and thereby, a second forged product including a rough flange having a thickness-changing portion is produced.
Kenji Tamura, Kenji Imanishi, Sam Soo Hwang, Kunihiro Yabuno, Kunihiro Yoshida, Koichiro Ishihara
Filed: 3 Apr 18
Utility
Non-oriented electrical steel sheet
23 Aug 22
A non-oriented electrical steel sheet includes a silicon steel sheet and an insulation coating.
Takeru Ichie, Masaru Takahashi, Fuminobu Murakami, Shinichi Matsui, Masahiro Yamamoto
Filed: 20 Mar 19
Utility
Metal sheet for containers and method for manufacturing same
23 Aug 22
A metal sheet for containers includes a metal sheet and a polyester film which is laminated on a surface of the metal sheet to be an inner surface side of containers.
Yoichiro Mori, Nobuo Kadowaki, Tadaaki Ochiai, Akihiko Hirata, Tomohiro Mizutani
Filed: 10 Mar 17
Utility
Carburized shaft part
23 Aug 22
A carburized shaft part having a predetermined composition, a C content at a surface layer part of a mass % of 0.60 to 1.00%, at least one hole at an outer circumferential surface, a total volume ratio of martensite and retained austenite of 97% or more at a structure at a position of a 1 mm depth from the outer circumferential surface in an axial direction of the hole and a position of a 20 μm depth from the surface of the hole, a maximum retained austenite volume ratio (R1) of 10.0 to 30.0% at a position of a 1 mm depth from the outer circumferential surface in the axial direction of the hole and a range up to a 200 μm depth from the surface of the hole, and a retained austenite reduction ratio of 20% or more found from R1 and the retained austenite volume ratio (R2) at a position of a 1 mm depth from the outer circumferential surface in the axial direction of the hole and a position of a 20 μm depth from the surface of the hole by the formula (A): Δγ=(R1−R)/R1×100.
Tatsuya Iwasaki, Koji Watari, Hidekazu Sueno
Filed: 20 Sep 17
Utility
Front Pillar Outer
18 Aug 22
An objective of the present disclosure is to provide a front pillar outer that is inexpensive, lightweight and strong.
Kenichiro OTSUKA, Masafumi AZUMA, Naoki KIMOTO
Filed: 14 Jul 20
Utility
Hot-rolled Steel Sheet and Method of Manufacturing Same
18 Aug 22
This hot-rolled steel sheet has a predetermined chemical composition, in which a microstructure contains, by area %, bainite: 80.0% or more, ferrite: 10.0% or less, and a remainder in the microstructure: 10.0% or less, a total density of a length L7 of a grain boundary having a crystal orientation difference of 7° and a length L68 of a grain boundary having a crystal orientation difference of 68° about a <110> direction in the bainite is 0.35 to 0.60 μm/μm2, and a tensile strength is 780 MPa or more.
Shohei YABU, Kunio HAYASHI, Koutarou HAYASHI, Kazumasa TSUTSUI
Filed: 12 Oct 20
Utility
Austenitic Stainless Steel Material and Welded Joint
18 Aug 22
Takahiro OSUKI, Yuhei SUZUKI, Shohgo AOTA, Hirokazu OKADA, Masahiro SETO
Filed: 22 Jul 20
Utility
Threaded Connection for Casing String of an Oil Well
18 Aug 22
Threaded tubular connection for the casing of hydrocarbon wells obtained by makeup of a male tool joint with a female tool joint, the connection includes in order from a free edge of the male tool joint: an inner metal-metal seal, a first threaded portion, an intermediate abutment, an intermediate metal-metal seal and a second threaded portion, the free edge being at a non-zero axial distance from the female tool joint, the threaded portions each comprising a helix equipped with a load flank, a thread crest, a stabbing flank, a thread root, such that a pitch of the load flank and a pitch of the stabbing flank of the first threaded portion, and respectively a pitch of the load flank and a pitch of the stabbing flank of the second threaded portion fulfil the following condition: SFLb1=LFLb1=SFLb2=LFLb2=SFLp1=SLFLp2=LFLp2.
Anthony FOULOGNE, Pierre MARTIN, Malic ABDEDDAIM, Mickael PUSARD
Filed: 15 Jul 20
Utility
Threaded Connection Having a Dissymmetrical Helical Profile
18 Aug 22
Threaded tubular connection for the casing of hydrocarbon wells obtained by makeup of a male tool joint with a female tool joint, the connection comprising a threaded portion (16a, 18a), such that the male and respectively female threaded portions each comprise a helix provided with a load flank, a thread crest, a stabbing flank, a thread root, such that a pitch of the load flank (LFLp, LFLb) and a pitch of the stabbing flank (SFLp, SFLb) fulfils the following condition: [Math 22] SFLb=LFLb=SFLp=LFLp=k, A tooth width (Wtp) of the male helix and a tooth width of the female helix (Wtb) are such that [Math 23] or [Math 24] and [Math 25] Wtp+Wtb<k
Anthony FOULOGNE, Pierre MARTIN
Filed: 15 Jul 20
Utility
Cooling device and cooling method of hot-rolled steel sheet
16 Aug 22
Provided is a cooling device, where a hot-finish-rolling mill includes a plurality of nozzles which spray cooling water toward one of or both of upper and lower surfaces of a hot-rolled steel sheet just after rolled by rolling stands, the nozzles are provided on the inside of the upper and lower guides or adjoining to the guides on a downstream side, and a nozzle spray distance changes depending on a position of the nozzle in a rolling direction, wherein a spray angle of the nozzle at a position whose nozzle spray distance is the largest is smaller than a spray angle of the nozzle at a position whose nozzle spray distance is the smallest, and the spray angle of the nozzle becomes the same or smaller as the nozzle spray distance becomes large.
Yoshihiro Serizawa, Takayuki Murai, Yoshiaki Suematsu, Satoru Hayashi, Tomoya Nakao, Hiroshi Niitani
Filed: 14 Sep 17
Utility
Structural member
16 Aug 22
A structural member includes a top sheet portion which has a first edge portion and a second edge portion facing the first edge portion, a wall portion which extends from the second edge portion in a direction intersecting the top sheet portion, and a closed cross-sectional portion which is provided in the first edge portion, in which the first edge portion is curved toward an inside of the top sheet portion in a plan view with respect to the top sheet portion, and when a distance from the first edge portion to the second edge portion of the structural member is referred to as a structural member width, the closed cross-sectional portion forms a closed cross section on a vertical cut plane of the structural member along a direction of the structural member width, the vertical cut plane of the structural member along the direction of the structural member width has an open cross section, and a shape of the vertical cut plane of the structural member including the closed cross-sectional portion is asymmetric with respect to a center of a length of the structural member width.
Yasuhiro Ito, Yoshiaki Nakazawa, Takeshi Kawachi
Filed: 27 Nov 18
Utility
Closed cross-sectional structure member having high collision performance and automobile body structure
16 Aug 22
A closed cross-sectional structure member includes a hollow member, the hollow member having a collision side wall part located on a collision side, an opposed collision side wall part opposing the collision side wall part, a pair of first side wall part and second side wall part connecting with end portions of the collision side wall part and end portions of the opposed collision side wall part, a first inner wall part extending from the first side wall part to an inside of the hollow member, a second inner wall part extending from the second side wall part to the inside of the hollow member, a third inner wall part connecting with the first inner wall part and the collision side wall part, and a fourth inner wall part connecting with the second inner wall part and the collision side wall part.
Soma Sonobe, Atsushi Ono, Yutaka Mikazuki
Filed: 13 Jun 19
Utility
Threaded joint for steel pipes
16 Aug 22
The threaded joint includes a pin and a box.
Yoshinori Ando, Shin Ugai, Yousuke Oku
Filed: 29 Nov 18
Utility
Manufacturing Method and Manufacturing Device of Structural Member
11 Aug 22
This manufacturing method of a structural member includes an intermediate step and a bending step.
Ryo TABATA, Yasuhiro ITO
Filed: 2 Jul 20
Utility
Cutting Method and Cut Article
11 Aug 22
There is provided a cutting method for cutting a workpiece using a cutting tool comprising a die and a punch, including: arranging the workpiece between the die and the punch, and in a state in which a wedge-shaped first cutting part of the die and a wedge-shaped second cutting part of the punch are opposed, pushing the punch relatively to the die side to cut the workpiece; wherein: a front end angle θ1 of the first cutting part and a front end angle θ2 of the second cutting part are each 100 or more and 1200 or less, and a front end radius R1 of the first cutting part and a front end radius R2 of the second cutting part are each 0.5% or more and 35.0% or less of a sheet thickness.
Takashi YASUTOMI, Akinobu KOBAYASHI
Filed: 9 Jan 20