586 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
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
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
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
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
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
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
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
Press forming method and tool for press forming
9 Aug 22
A press forming method includes a first process of obtaining a pressing force applied to each portion of a tool by an workpiece material during press forming while independently driving the respective each portion of the tool divided into multiple portions and press forming the workpiece material, and a second process of adjusting at least one of an applied driving force, an applied driving speed, and an applied driving timing for each portion of the tool to cause a processing portion of the workpiece material in which the state approaching an overload state is detected based on the pressing force to flow to other processing portions of the workpiece material.
Yasuhiro Wada, Shuji Yamamoto, Mitsuharu Yamagata
Filed: 28 Jun 19
Utility
Method for manufacturing grain-oriented electrical steel sheet and grain-oriented electrical steel sheet
9 Aug 22
A method for manufacturing a grain-oriented electrical steel sheet including a step of hot-rolling a slab containing a predetermined component composition with a remainder including Fe and an impurity to obtain a hot-rolled steel sheet, a step of, after carrying out hot-rolled steel sheet annealing on the hot-rolled steel sheet, carrying out cold rolling to obtain a cold-rolled steel sheet, a step of carrying out primary recrystallization annealing including a rapid temperature increase at an average temperature increase velocity V of 400° C./s or more and imparting of a steel sheet tensile force S on the cold-rolled steel sheet, and a step of applying an annealing separating agent to a surface of the cold-rolled steel sheet after the primary recrystallization annealing and then carrying out flattening annealing.
Nobusato Morishige, Takashi Kataoka, Haruhiko Atsumi, Yasuhiro Mayumi, Atsushi Suzuki, Tomoya Suenaga, Teruyuki Tamaki
Filed: 20 Mar 19
Utility
Steel sheet
9 Aug 22
There is provided a steel sheet including an inner layer and a hard layer formed on one or both surfaces of the inner layer, wherein each content of C and Mn in the hard layer is more than each content of C and Mn in the inner layer, a thickness of the hard layer is 20 μm or more and a total of the thickness of the hard layer is ⅖ or less of the entire sheet thickness, an average micro-Vickers hardness of the hard layer is 400 HV or more and less than 800 HV, an average micro-Vickers hardness of the inner layer is 350 HV or more and is 50 HV or more smaller than a hardness of the hard layer, and a screw dislocation density of the inner layer is 2.0×1013 m/m3 or more.
Kengo Takeda, Riki Okamoto, Kazuo Hikida, Katsuya Nakano, Yuya Suzuki, Genki Abukawa
Filed: 20 Feb 18
Utility
High strength steel sheet
9 Aug 22
High strength steel sheet having a tensile strength of 800 MPa or more comprising a middle part in sheet thickness and a soft surface layer arranged at one side or both sides of the middle part in sheet thickness, wherein each soft surface layer has a thickness of more than 10 μM and 30% or less of the sheet thickness, the soft surface layer has an average Vickers hardness of more than 0.60 time and 0.90 time or less the average Vickers hardness of the sheet thickness 1/2 position, and the soft surface layer has a nano-hardness standard deviation of 0.8 or less is provided.
Yuya Suzuki, Katsuya Nakano, Genki Abukawa, Kunio Hayashi
Filed: 20 Feb 18
Utility
Threaded connection for oil country tubular goods and method for producing threaded connection for oil country tubular goods
9 Aug 22
Masanari Kimoto, Masahiro Oshima
Filed: 10 May 18
Utility
Method for setting rolling mill, and rolling mill
2 Aug 22
A method for setting a rolling mill, the method being executed before reduction position zero point adjustment or before the start of rolling, and including: a first process of setting rolls in an open state, and with respect to each of the upper roll assembly and the lower roll assembly, adjusting positions of roll chocks in a rolling direction based on a torque acting on the work roll or a vertical roll load difference; and a second process of, after the first process, setting rolls in a kiss roll state, measuring a vertical roll load in two rotational states on a work side and a drive side, and moving roll chocks of a roll assembly on the opposite side to a reference roll simultaneously and in a same direction so that the vertical roll load difference falls within an allowable range to thereby adjust the positions of the roll chocks.
Atsushi Ishii, Kazuma Yamaguchi, Daisuke Nikkuni
Filed: 4 Mar 19
Utility
Press tooling
2 Aug 22
A press tooling includes a distance member pivotably supported by a holder; and a moving device provided on a first die unit.
Kazunori Oooka, Toshimitsu Aso, Hiroshi Yoshida, Daisuke Yasufuku, Yasuharu Tanaka, Takashi Miyagi, Junichiro Suzuki, Shinobu Yamamoto
Filed: 6 Dec 18
Utility
Structural member for automobiles
2 Aug 22
A structural member for an automobile to be disclosed includes a press-formed product formed from one steel sheet and a reinforcing member fixed to the press-formed product.
Kenichiro Otsuka
Filed: 10 Apr 18