586 patents
Page 12 of 30
Utility
Spot-welded joint and spot welding method
8 Jun 21
By obtaining a spot-welded joint being a spot-welded joint formed by overlapping a plurality of pieces of steel plates (1A, 1B) and performing spot welding on the steel plates, including a high-strength steel plate whose tensile strength is 750 (MPa) to 2500 (MPa), being at least one piece of steel plate out of the plurality of pieces of steel plates, in which a carbon equivalent Ceq of the high-strength steel plate is 0.20 mass % to 0.55 mass %, and ten or more of iron-based carbides in each of which a length of a longest portion is 0.1 (μm) or more exist in a square region 103 within a heat-affected zone 4 of a cross section that passes through a center of a welding mark, and is cut along a plate thickness direction of the steel plates (1A, 1B), a cross tensile strength of the spot-welded joint to be formed is improved.
Chisato Wakabayashi, Fuminori Watanabe, Seiji Furusako, Yasunobu Miyazaki, Hiroyuki Kawata, Tohru Okada, Hideki Hamatani
Filed: 28 Sep 18
Utility
Steel sheet for hot stamping
8 Jun 21
A steel sheet for hot stamping includes a steel structure represented by an area fraction of bainite, fresh martensite and tempered martensite: 80% or more in total, and a product of a number density (pieces/μm2) of carbides and a proportion of carbides precipitated into prior austenite grains in carbides: 0.50 or more.
Genki Abukawa, Kunio Hayashi, Kazuo Hikida, Kaoru Kawasaki
Filed: 17 Jan 17
Utility
Hot-stamping formed article, structural member using the same, and manufacturing method of hot-stamping formed article
8 Jun 21
The present invention provides a hot-stamping formed article which is long and formed of a single steel sheet, the hot-stamping formed article including: two standing wall portions; a top sheet portion adjacent to the two standing wall portions; and a protrusion portion including an overlapping portion in which a portion of the steel sheet extending from at least one standing wall portion of the two standing wall portions and a portion of the steel sheet extending from the top sheet portion overlap, in which an angle between the top sheet portion and the protrusion portion in a case where a plane perpendicular to a longitudinal direction of the hot-stamping formed article is viewed in a cross section is larger than 90°.
Kenichiro Otsuka
Filed: 13 Jul 17
Utility
Steel sheet and plated steel sheet
8 Jun 21
When a zone surrounded by a grain boundary that is measured to be 5.0° or more by an EBSD analysis is assumed to be a grain, and when a K value is a value obtained by multiplying an average value of Image Qualities in a grain by 10−3, a Y value is an average crystal misorientation (°) in the grain, a metallic phase 1 is a metallic phase the K value of which is less than 4.000, a metallic phase 2 is a metallic phase the K value of which is 4.000 or more and the Y value of which is 0.5 to 1.0, a metallic phase 3 is a metallic phase the K value of which is 4.000 or more and the Y value of which is less than 0.5, and a metallic phase 4 is a metallic phase that falls under none of metallic phases 1 to 3, there is provided a steel sheet that has a predetermined chemical composition and includes a microstructure including, in area percent, a metallic phase 1: 1.0% or more and less than 35.0%, a metallic phase 2: 30.0% or more and 80.0% or less, a metallic phase 3: 5.0% or more and 50.0% or less, and a metallic phase 4: 5.0% or less.
Yuri Toda, Masafumi Azuma, Akihiro Uenishi, Eisaku Sakurada, Tatsuo Yokoi, Genichi Shigesato
Filed: 27 Jan 17
Utility
Surface-treated metal sheet, coated member, and method for producing coated member
8 Jun 21
Provided are a surface-treated metal sheet excellent in the adhesiveness to a coating treatment film and weldability and a coated member.
Yasuaki Kawamura, Koji Akioka, Akihiro Sengoku, Yoichiro Mori
Filed: 30 Mar 16
Utility
Scale composition determination system, scale composition determination method, and program
8 Jun 21
A scale composition determination device (10) determines that Fe2O3 has been generated in the outermost layer of a scale (SC) in the case where the absolute value of a difference between temperatures of a steel material SM measured by radiation thermometers (20a, 20b) is equal to or more than a predetermined temperature, and determines that Fe2O3 has not been generated in the outermost layer of the scale (SC) in the case where the absolute value of the difference between the temperatures of the steel material SM measured by the radiation thermometers (20a, 20b) is not equal to or more than the predetermined temperature.
Hiroshi Tanei, Masato Sugiura, Shuichi Yamazaki, Yasumitsu Kondo
Filed: 25 Apr 18
Utility
Hot press-formed part
8 Jun 21
A hot press-formed part according to an aspect of the present invention contains a predetermined chemical composition; in which a microstructure in a thickness ¼ portion includes, by unit vol %, tempered martensite: 20% to 90%, bainite: 5% to 75%, and residual austenite: 5% to 25%, and ferrite is limited to 10% or less; and a pole density of an orientation {211}<011> in the thickness ¼ portion is 3.0 or higher.
Mutsumi Sakakibara, Natsuko Sugiura, Kunio Hayashi, Kaoru Kawasaki
Filed: 16 Aug 16
Utility
Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet
1 Jun 21
A non-oriented electrical steel sheet contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.0% to 3.3%, P: more than 0% and less than 0.030%, S: more than 0% and 0.0050% or less, sol.
Hiroyoshi Yashiki, Yoshiaki Natori, Kazutoshi Takeda, Susumu Mukawa, Takuya Matsumoto, Koji Fujita, Takashi Morohoshi, Masafumi Miyazaki
Filed: 16 Jan 18
Utility
Austenitic stainless steel weld metal and welded structure
1 Jun 21
An austenitic stainless steel weld metal which has a chemical composition consisting of, by mass %, C: 0.05 to 0.11%, Si: 0.10 to 0.50%, Mn: 1.0 to 2.5%, P: 0.035% or less, S: 0.0030% or less, Co: 0.01 to 1.00%, Ni: 9.0 to 11.5%, Cr: 17.0 to 21.0%, Nb: 0.60 to 0.90%, Ta: 0.001 to 0.100%, N: 0.01 to 0.15%, Al: 0.030% or less, O: 0.020% or less, V: 0 to 0.10%, Ti: 0 to 0.10%, W: 0 to 0.50%, Mo: 0 to 0.50%, Cu: 0 to 0.50%, B: 0 to 0.005%, Ca: 0 to 0.010%, Mg: 0 to 0.010% and REM: 0 to 0.10%, with the balance being Fe and impurities, and satisfying [Nb−7.8×C≤0.25].
Hiroyuki Hirata, Kana Jotoku, Katsuki Tanaka
Filed: 3 Oct 18
Utility
Sn-plated steel sheet and method for manufacturing Sn-plated steel sheet
1 Jun 21
A Sn-plated steel sheet according to the present invention includes a steel sheet, a Sn-plated layer that is provided on at least one surface of the steel sheet, and a film that is provided on a surface of the Sn-plated layer and includes zirconium oxide and tin oxide, in which an amount of the zirconium oxide in the film is 0.2 mg/m2 to 50 mg/m2 in terms of metal Zr amount, in a depth direction analysis by X-ray photoelectron spectroscopy, a depth position A at which an element concentration of Zr present as the zirconium oxide is maximum is positioned closer to a surface of the film than a depth position B at which an element concentration of Sn present as the tin oxide is maximum, and a distance between the depth position A and the depth position B in a depth direction is 0.5 nm or more.
Shintaro Yamanaka, Shigeru Hirano, Masakazu Noda, Yasuhiko Sato
Filed: 13 Apr 18
Utility
Method and apparatus for manufacturing press component
1 Jun 21
A method and apparatus for manufacturing a press component without generating cracks in a flange on an inner circumferential side of a curved portion includes press working by a free bending method on a blank consisting of an ultra-high tensile strength steel sheet.
Masahiro Saito, Ryuichi Nishimura, Yasuharu Tanaka, Takashi Miyagi, Takashi Yamamoto
Filed: 27 Jun 16
Utility
Titanium alloy part
25 May 21
A titanium alloy part is characterized in that it includes, by mass %: Al: 1.0 to 8.0%; Fe: 0.10 to 0.40%; O: 0.00 to 0.30%; C: 0.00 to 0.10%; Sn: 0.00 to 0.20%; Si: 0.00 to 0.15%; and the balance: Ti and impurities, in which: an average grain diameter of α-phase crystal grains is 15.0 μm or less; an average aspect ratio of the α-phase crystal grains is 1.0 or more and 3.0 or less; and a coefficient of variation of a number density of β-phase crystal grains distributed in the α phase is 0.30 or less.
Genki Tsukamoto, Kazuhiro Takahashi, Hideto Seto
Filed: 28 Aug 18
Utility
Pressed component manufacturing method, pressed component, and pressing apparatus
25 May 21
A process of pressing a blank to form an intermediate formed component configured including a top plate, the ridge lines at short direction ends of the top plate, and vertical walls facing each other in a state extending from the respective ridge lines and at least one of the vertical walls configuring a curved wall curving as viewed from an upper side of the top plate, such that a step projecting toward an opposite side to a side on which the vertical walls face each other is formed to the curved wall so as to run along a length direction of the top plate.
Masahiro Kubo, Hiroshi Yoshida, Takashi Miyagi, Toshiya Suzuki, Yoshiaki Nakazawa
Filed: 21 Apr 16
Utility
Threaded connection
25 May 21
A threaded connection that provides high sealing performance is provided.
Satoshi Maruta, Yousuke Oku
Filed: 17 Jan 18
Utility
Breaking prediction method, program, recording medium, and arithmetic processing device
25 May 21
In a breaking prediction method of predicting a breaking portion of a component, which is obtained by forming a metal sheet, by using a finite element method, the breaking portion is easily and reliably extracted.
Jun Nitta, Shigeru Yonemura, Satoshi Shirakami, Takashi Yasutomi
Filed: 18 May 16
Utility
Collapse strength prediction method
25 May 21
A collapse strength prediction method of a steel pipe includes deriving a prediction equation indicating a relationship among D/t obtained by dividing an outer diameter D (mm) by a thickness t (mm), material characteristics, a collapse strength dominant factor, and a collapse dominant proof stress (σCDOS) of the steel pipe using a plurality of reference steel pipes collapse whose strengths have been obtained in advance, obtaining D/t, material characteristics, a collapse strength dominant factor, and a predicted collapse strength of a steel pipe that is an evaluation subject, obtaining a compressive stress-strain curve in a circumferential direction of the steel pipe that is the evaluation subject, obtaining a stress that causes a permanent strain to be generated in the steel pipe that is the evaluation subject as the collapse dominant proof stress on the basis of the compressive stress-strain curve, and computing the predicted collapse strength of the steel pipe that is the evaluation subject from the D/t, the material characteristics, the collapse strength dominant factor, and the collapse dominant proof stress, which have been obtained, on the basis of the prediction equation, and the permanent strain is set according to a value of the D/t of the steel pipe that is the evaluation subject.
Yukinobu Nagata, Yuusuke Ichinose
Filed: 16 Oct 17
Utility
Spot welding method
18 May 21
The present invention provides a spot welding method for a member to be welded constituted of a plurality of steel sheets that are overlapped with each other at at least a welding zone, in which at least an overlapped face of at least one of the plurality of steel sheets at the welding zone is coated with zinc plating, a total sheet thickness t (mm) of the plurality of steel sheets is 1.35 mm or more, a squeeze time St (seconds) from the time when welding electrodes are brought into contact with the member to be welded to the time when electric current flow for welding starts satisfies “0.020≤St”, and a hold time Ht( seconds) after welding from the time when electric current flow for welding between the welding electrodes ends to the time when the welding electrodes and the member to be welded are brought out of contact satisfies “0.015t2+0.020≤Ht”.
Chisato Yoshinaga, Yasunobu Miyazaki, Kunio Hayashi, Hiroyuki Kawata, Masanori Yasuyama
Filed: 2 Sep 16
Utility
Automotive component manufacturing method and automotive component
18 May 21
An automotive component manufacturing method includes a molding process of pressing a portion of a hollow tube formed from a metal material, or a composite material including a metal and a resin, so as to deform the portion of the hollow tube, from a tube outer side toward a tube inner side, to beyond an axial center of the hollow tube, and mold the portion of the hollow tube into a deformed section deformed with a concave profile; and a deformation process of deforming a location having a high level of residual stress in a closed cross-section configured by the deformed section so as to deform the location out-of-plane.
Manabu Wada, Yasushi Suzuki, Noboru Hasegawa
Filed: 9 Mar 17
Utility
Stress test jig and stress test method
11 May 21
A stress test the jig 10 includes an upper cylinder 12, a lower cylinder 14, and a frame 16.
Koichi Kuroda, Daisaku Yanaga, Yuhei Suzuki
Filed: 18 Jul 17
Utility
Panel-shaped formed product and method for producing panel-shaped formed product
11 May 21
A panel-shaped formed product made of a metal sheet includes a top panel portion, an opening portion, and a vertical wall portion.
Kenichiro Otsuka, Yoshiaki Nakazawa, Naruhiko Nomura, Toshiya Suzuki, Masahiro Kubo
Filed: 22 Dec 15