586 patents
Page 19 of 30
Utility
Method for producing steel sheet pile
24 Aug 20
To suppress the shape defect at a bite end part of a material to be rolled at a bending rolling stage of a rough rolling step to achieve improvements in productivity such as an improvement in yields and a decrease in crop in production of a steel sheet pile.
Ryo Hashimoto, Hiroshi Yamashita, Yosuke Miura, Masanori Kawai
Filed: 24 Jan 18
Utility
Collision test apparatus using test sample support for structural member
24 Aug 20
A test sample support for use in a collision test using a center pillar assembly of an automobile body as a test sample, includes a linear main body, a first attachment part, and a second attachment part.
Yasunori Ito, Susumu Yuasa
Filed: 2 Dec 14
Utility
Method of manufacturing a quenched member and quenched member
24 Aug 20
A method of manufacturing a quenched member includes heating a pressed intermediate article to an Ac3 transformation point of a steel sheet or higher, the intermediate article having been processed so as to have a rectangular cross-section and so as to include a terminal portion at which two terminal edges of the steel sheet are aligned with each other at a same side of the rectangular cross-section, and quenching the heated intermediate article inside a die.
Toshiya Suzuki, Yoshiaki Nakazawa
Filed: 13 Mar 18
Utility
Steel for suspension spring and method of manufacturing same
24 Aug 20
Steel for a suspension spring including, as a chemical composition, by % by mass: C: more than 0.40% and 0.65% or less; Si: 1.00% to 3.50%; Mn: more than 2.00% and 3.00% or less; Cr: 0.01% to 2.00%; V: 0.02% to 0.50%; P: 0.020% or less; S: 0.020% or less: N: 0.0100% or less; and a remainder of Fe and impurities, in which Kf is 280 or more, in which a structure contains a tempered martensite of which an area ratio is 90% or more, in which a Fe-based carbide precipitated in the tempered martensite is a cementite, and in which an average of an area ratios of prior austenite grains which stretch in a longitudinal direction of the steel and of which an aspect ratio exceeds 3.0, is 80% or more in a case of depths of 0.1 mm, 0.2 mm, and 0.3 mm in a sheet thickness direction from a surface of the steel.
Manabu Kubota, Koichi Banno, Keisuke Chiba, Ryuuichi Seki
Filed: 9 Mar 16
Utility
Hot-rolled steel sheet
24 Aug 20
A hot-rolled steel sheet includes a predetermined chemical composition, and a structure which includes, by area ratio, a ferrite in a range of 5% to 60% and a bainite in a range of 30% to 95%, in which in the structure, in a case where a boundary having an orientation difference of equal to or greater than 15° is defined as a grain boundary, and an area which is surrounded by the grain boundary and has an equivalent circle diameter of equal to or greater than 0.3 μm is defined as a grain, the ratio of the grains having an intragranular orientation difference in a range of 5° to 14° is, by area ratio, in a range of 20% to 100%.
Natsuko Sugiura, Mitsuru Yoshida, Hiroshi Shuto, Tatsuo Yokoi, Masayuki Wakita
Filed: 21 Feb 16
Utility
High-strength PC steel wire
24 Aug 20
This invention provides a high-strength PC steel wire having a chemical composition containing, in mass %, C: 0.90 to 1.10%, Si: 0.80 to 1.50%, Mn: 0.30 to 0.70%, P: 0.030% or less, S: 0.030% or less, Al: 0.010 to 0.070%, N: 0.0010 to 0.010%, Cr: 0 to 0.50%, V: 0 to 0.10%, B: 0 to 0.005%, Ni: 0 to 1.0%, Cu: 0 to 0.50%, and the balance: Fe and impurities.
Makoto Okonogi, Daisuke Hirakami, Masato Yamada, Katsuhito Oshima, Shuichi Tanaka
Filed: 19 Jul 16
Utility
Low alloy oil-well steel pipe
24 Aug 20
Provided is a low alloy oil-well steel pipe having a yield strength of 793 MPa or more, and an excellent SSC resistance.
Keiichi Kondo, Yuji Arai
Filed: 1 Oct 15
Utility
Method of producing press-formed product
17 Aug 20
A method of producing a press-formed product includes a steel plate heating step, a hot forging step and a hot stamping step.
Yoshiaki Nakazawa, Naruhiko Nomura, Toshiya Suzuki, Masahiro Kubo, Yasuhiro Ito
Filed: 16 May 17
Utility
Metal plate for laser processing and method for producing stainless steel plate for laser processing
17 Aug 20
A metal plate for laser processing (such as a stainless steel plate or a titanium plate) and preferably an austenitic stainless steel plate suitable for use as a metal mask or the like which undergoes fine processing with a laser has an average grain diameter d (μm) and a plate thickness t (μm) which satisfy the equation d≤0.0448·t−1.28.
Kazuyoshi Fujisawa, Masayuki Shibuya, Kouichi Takeuchi
Filed: 17 Apr 17
Utility
Control arm
17 Aug 20
A control arm includes a pair of mounting portions provided separately from each other and a main body portion extending in a X-direction and connecting the pair of mounting portions.
Yujiro Tatsumi, Kenichiro Otsuka, Yoshiaki Nakazawa, Masanori Yasuyama, Hitoshi Sakuma, Ayaka Musha
Filed: 8 Dec 16
Utility
Galvannealed steel sheet and method for producing the same
17 Aug 20
A steel sheet for galvannealed steel contains, by mass %, C: 0.25 to 0.70%, Si: 0.25 to 2.50%, Mn: 1.00 to 5.00%, Al: 0.005 to 3.50%, P: 0.15% or less, S: 0.03% or less, N £ 0.02%, O £ 0.01%, and optionally one or more selected from Ti, Nb, V, Cr, Mo, Cu, Ni, B, Ca, REM, Mg, W, Zr, Sb, Sn, As, Te, Y, Hf and Co, a balance being Fe and impurities.
Kohichi Sano, Jun Haga, Koutarou Hayashi, Hiroyuki Kawata, Riki Okamoto, Akihiro Uenishi
Filed: 9 Jun 16
Utility
Oxide superconducting bulk magnet
17 Aug 20
Mitsuru Morita
Filed: 28 Sep 16
Utility
Assembly for producing a threaded connection for drilling and operating hydrocarbon wells, and method for producing such a threaded connection
10 Aug 20
A set for producing a threaded connection, includes first, second, third, and fourth tubular component with axis of revolution, the first tubular component including at each of its ends a first and a second threaded zone provided on the inner peripheral surface of the component, the second tubular component including at each of its ends a third and a fourth threaded zone provided on the outer peripheral surface of the component, the third tubular component including at one of its ends a fifth and a sixth threaded zone respectively provided on the inner and outer peripheral surface of the component, the fourth tubular component including at one of its ends a seventh and an eighth threaded zone respectively provided on the inner and outer peripheral surface of the component.
Pierre Bernard Martin, Sebastien Colin, Xavier Mencaglia, Karine Ruffin
Filed: 16 Jun 14
Utility
Electric-resistance welded steel pipe
10 Aug 20
The present invention provides electric-resistance welded steel pipe optimal for applications such as production of shale gas which is comprised of steel having a chemical composition which contains, by mass %, respectively, C: 0.08 to 0.18%, Si: 0.01% to 0.50%, Mn: 1.30 to 2.1%, Al: 0.001 to 0.10%, Nb: 0.005 to 0.08%, and Ti: 0.005 to 0.03%, is limited to N 0.008% or less, P: 0.020% or less, and S: 0.010% or less, and has a balance of Fe and unavoidable impurities, wherein a structure at a center part of thickness is 40% to 70% by area of ferrite phase having a circle-equivalent diameter of 1.0 μm to 10.0 μm and a balance of a low temperature transformation phase comprising a bainite phase, and Ceq satisfies 0.32≤Ceq≤0.60.
Hideki Hamatani, Keinosuke Iguchi, Masakazu Ozaki, Takaaki Fukushi, Takuya Asano
Filed: 19 Dec 13
Utility
As-rolled type K55 electric resistance welded oil well pipe and hot-rolled steel sheet
10 Aug 20
An as-rolled type K55 electric resistance welded oil well pipe includes, in terms of % by mass, 0.30 to 0.50% of C, 0.05 to 0.40% of Si, 0.50 to 1.20% of Mn, 0 to 0.030% of P, 0 to 0.020% of S, 0.002 to 0.080% of Al, 0 to 0.0080% of N, 0 to 0.30% of Cu, 0 to 0.30% of Ni, 0 to 0.30% of Cr, 0 to 0.10% of Mo, 0 to 0.10% of V, 0 to 0.050% of Nb, 0 to 0.030% of Ti, 0 to 0.0100% of Ca, and the balance being Fe and impurities.
Tetsuo Ishitsuka, Takashi Tsusue, Shuji Iwamoto, Shunichi Kobayashi, Toshiyuki Ogata, Osamu Yoshida, Hideto Kawano
Filed: 30 Oct 16
Utility
Surface-treated steel sheet for fuel tanks
10 Aug 20
A surface-treated steel sheet for fuel tanks, including a Zn—Ni alloy plating layer on one surface or both surfaces of a steel sheet; and a trivalent chromate covering layer or a chromate-free covering layer on the Zn—Ni alloy plating layer, wherein, in a surface outermost layer of the trivalent chromate covering layer or the chromate-free covering layer, concavities, of which a depth from an arithmetic average height of a cross-sectional curve of the surface outermost layer is more than or equal to 0.1 μm, exist in a proportion of 50 to 1000 concavities/mm2 and at an area ratio of 20 to 80% to a surface area of the steel sheet.
Hiromasa Shoji, Taihei Kaneto, Masahiro Fuda, Hironori Sato, Natsuko Sugiura, Yuji Yamaguchi
Filed: 28 Aug 16
Utility
Steel foil for electrical storage device container, container for electrical storage device, and electrical storage device
10 Aug 20
A steel foil for an electrical storage device container, including a steel foil, a metal chromium layer layered on the steel foil, and a hydrated chromium oxide layer layered on the metal chromium layer, in which the concentration of Fe from a surface of the hydrated chromium oxide layer to a depth of 10 nm is less than 10% by mass, the area ratio of a site having an arithmetic mean roughness Ra of 10 nm or more in a visual field of 1 μm at the surface of the hydrated chromium oxide layer is less than 20%, and a site having an arithmetic mean roughness Ra of less than 10 nm in a visual field of 1 μm has an arithmetic mean roughness Ra of 3 nm or less in a visual field of 1 μm at the surface of the hydrated chromium oxide layer, is adopted.
Masaharu Ibaragi, Koichi Nose, Yasuto Goto, Nobuo Kadowaki, Hiroto Unno
Filed: 6 Apr 16
Utility
Eddy current retarder with electricity generating function
3 Aug 20
An eddy current retarder includes a brake drum, a magnet retention ring, and a switch mechanism.
Kenji Imanishi, Hiroyuki Yamaguchi, Shotaro Kadokawa, Takuya Fujita, Hiroshi Nogami
Filed: 5 Sep 19
Utility
Nitrided steel part and method of production of same
3 Aug 20
A nitrided steel part excellent in pitting resistance and bending fatigue characteristic enabling reduction of size and decrease of weight of parts or enabling demand for high load capacities to be met, using as a material a steel material containing, by mass %, C: 0.05 to 0.25%, Si: 0.05 to 1.5%, Mn: 0.2 to 2.5%, P: 0.025% or less, S: 0.003 to 0.05%, Cr: over 0.5 to 2.0%, Al: 0.01 to 0.05%, and N: 0.003 to 0.025%, having a balance of Fe and impurities, having formed on the steel surface a compound larger of a thickness 3 μm or less containing iron, nitrogen, and carbon and a hardened layer formed below the compound layer, and having an effective hardened layer depth of 160 to 410 μm.
Takahide Umehara, Masato Yuya, Yoshihiro Daito
Filed: 7 Sep 16
Utility
Method for producing H-shaped steel
3 Aug 20
Hiroshi Yamashita
Filed: 9 Mar 16