1279 patents
Page 9 of 64
Utility
Grain-oriented Electrical Steel Sheet, Method for Manufacturing Grain-oriented Electrical Steel Sheet, and Annealing Separator Utilized for Manufacture of Grain-oriented Electrical Steel Sheet
21 Apr 22
Grain-oriented electrical steel sheet excellent in magnetic properties and excellent in adhesion of the primary coating to the steel sheet is provided.
Ryutaro YAMAGATA, Ichiro TANAKA
Filed: 8 Jan 20
Utility
Method for Producing Grain Oriented Electrical Steel Sheet
21 Apr 22
A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
Shinsuke TAKATANI, Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Shohji NAGANO, Shunsuke OKUMURA
Filed: 16 Jan 20
Utility
Grain-oriented Electrical Steel Sheet
21 Apr 22
A grain-oriented electrical steel sheet of the present invention has a base steel sheet, an amorphous oxide layer formed on the base steel sheet, and a tension-insulation coating formed on the amorphous oxide layer, in which the base steel sheet contains, as a chemical composition, by mass %, C: 0.085% or less, Si: 0.80 to 7.00%, Mn: 1.50% or less, acid-soluble Al: 0.065% or less, S: 0.013% or less, Cu: 0 to 0.80%, N: 0 to 0.012%, P: 0 to 0.50%, Ni: 0 to 1.00%, Sn: 0 to 0.30%, and Sb: 0 to 0.30%, a remainder is Fe and an impurity, a surface glossiness Gs20(A) in a direction parallel to a rolling direction is 2.0 to 70, and a surface glossiness Gs20(B) in a direction perpendicular to the rolling direction is 2.0 to 70.
Shinsuke TAKATANI, Yoshihiro ARITA, Shunsuke OKUMURA, Shohji NAGANO
Filed: 16 Jan 20
Utility
Method for Manufacturing Grain-oriented Electrical Steel Sheet
21 Apr 22
The method for manufacturing a grain-oriented electrical steel sheet is a method for manufacturing a grain-oriented electrical steel sheet including a strain region forming process of irradiating the grain-oriented electrical steel sheet having a base steel sheet (1), an intermediate layer (4) disposed to be in contact with the base steel sheet (1), and an insulation coating (3) disposed to be in contact with the intermediate layer (4) with an electron beam and forming a strain region (D) which extends in a direction intersecting a rolling direction of the base steel sheet (1) on a surface of the base steel sheet (1), wherein, in the strain region forming process, a temperature of a central portion of the strain region (D) in the rolling direction of the base steel sheet (1) and an extension direction of the strain region (D) is heated to 800° C. or higher and 2000° C. or lower.
Satoshi ARAI, Yoshiyuki USHIGAMI, Hideyuki HAMAMURA, Shinji YAMAMOTO, Shunsuke OKUMURA
Filed: 16 Jan 20
Utility
Hot Dip Galvanized Steel Sheet and Method for Producing Same
21 Apr 22
Provided are a hot dip galvanized steel sheet comprising a base steel sheet and a hot dip galvanized layer on at least one surface of the base metal steel sheet, wherein the base steel sheet has a predetermined chemical composition, and contains, by volume fraction, ferrite: 0% to 50%, retained austenite: 0% to 30%, tempered martensite: 5% or more, fresh martensite: 0% to 10%, and pearlite and cementite in total: 0% to 5%, when there are remaining structures, the remaining structures consist of bainite, a concentration of B atoms at prior austenite grain boundaries is 2.0 atm % or more, and an average effective crystal grain size is 7.0 μm or less, and a method for producing the same.
Takafumi YOKOYAMA, Hiroyuki KAWATA, Kunio HAYASHI, Yuji YAMAGUCHI, Satoshi UCHIDA
Filed: 6 Feb 20
Utility
Steel Sheet and Method for Producing Same
21 Apr 22
A steel sheet of the present invention is a steel sheet having a predetermined chemical composition and containing at least ferrite, residual austenite, and/or martensite in a microstructure, and furthermore, is a steel sheet in which, in a plane parallel to a rolled surface, an average distance between centers of high Mn regions adjacent to each other is 1.00 mm or less, a density DA of the high Mn regions at a sheet width center portion and a density DB of the high Mn regions at a ¼ position from a sheet width end portion satisfy a relationship of 0.77≤DA/DB≤1.30, a ratio of an average hardness of the high Mn regions to an average hardness of the low Mn regions is 1.1 to 2.0, and a difference between an average of a top 5% and an average of a bottom 5% of Mn contents in the low Mn regions is 0.3% or more.
Kohichi SANO, Hiroyuki KAWATA
Filed: 8 Apr 20
Utility
Plated Steel Sheet
21 Apr 22
A plated steel sheet having excellent chemical convertibility includes: a steel; and a plating layer that is provided on a surface of the steel, in which the plating layer includes, by mass %, Al: 5.00% to 35.00%, Mg: 2.50% to 13.00%, Fe: 5.00% to 35.00%, Si: 0% to 2.00%, Ca: 0.03% to 2.00%, and a remainder consisting of Zn and impurities, and in a surface of the plating layer, the area fraction of a Fe—Al phase is 0% to 30%, the area fraction of a rod-like lamellar structure of Zn and MgZn2 is 5% to 90%, the area fraction of a massive MgZn2 phase is 10% to 70%, and the area fraction of a remainder is 10% or less.
Takuya MITSUNOBU, Jun MAKI, Hiroshi TAKEBAYASHI, Takehiro TAKAHASHI, Kohei TOKUDA
Filed: 16 Apr 20
Utility
Steel Sheet
21 Apr 22
The present invention relates to steel sheet realizing both formability and weldability.
Yuya SUZUKI, Kengo TAKEDA
Filed: 24 Apr 20
Utility
Hot-stamping Formed Body
21 Apr 22
A hot-stamping formed body has a predetermined chemical composition, in which an average grain size of prior austenite grains in a microstructure is 5.0 μm or less, and an average Mn concentration at grain boundaries of the prior austenite grains is 1.0 mass % or less.
Shingo FUJINAKA, Yuri TODA, Daisuke MAEDA
Filed: 19 Mar 20
Utility
Grain-oriented Electrical Steel Sheet and Manufacturing Method of the Same
21 Apr 22
This grain-oriented electrical steel sheet includes a steel sheet, an insulation coating disposed on the steel sheet, and a spinel present at a part on the steel sheet at an interface between the steel sheet and the insulation coating by being fitted into the insulation coating, in which an amount of the spinel is 5 to 50 mg/m2 per unit area of a surface of the steel sheet.
Hiroyasu FUJII, Seiki TAKEBAYASHI, Yoshiyuki USHIGAMI, Takashi KATAOKA, Shunsuke OKUMURA
Filed: 16 Jan 20
Utility
Rail
21 Apr 22
A rail including a predetermined chemical composition is provided, in which 90 area % or greater of a metallographic structure in a cross section of a rail web portion is a pearlite structure, a minimum value of a hardness in the cross section of the rail web portion is Hv 300 or greater, and a difference between a maximum value and the minimum value of the hardness in the cross section of the rail web portion is Hv 40 or less.
Masaharu UEDA, Teruhisa MIYAZAKI, Takuya TANAHASHI, Yusuke MAEDA
Filed: 2 Mar 20
Utility
Method for producing seamless metal pipe
19 Apr 22
Kouji Yamane, Kazuhiro Shimoda, Yuji Inoue, Shusuke Shimooka, Yuichi Yamanari
Filed: 8 Jun 18
Utility
Steel Sheet and Method for Producing Same
14 Apr 22
A steel sheet includes, as a chemical composition, by mass %: C: 0.0015% to 0.0400%; Mn: 0.20% to 1.50%; P: 0.010% to 0.100%; Cr: 0.001% to 0.500%; Si: 0.200% or less; S: 0.020% or less; sol.
Masahiro KUBO, Hiroyuki KAWATA, Kenichiro OTSUKA, Masafumi AZUMA
Filed: 7 Jan 20
Utility
Steel Pipe for Fuel Injection Pipe, and Fuel Injection Pipe Using Same
14 Apr 22
A steel pipe for a fuel injection pipe has a chemical composition consisting of, by mass %: C: 0.17 to 0.27%, Si: 0.05 to 0.40%, Mn: 0.30 to 2.00%, P: 0.020% or less, S: 0.0100% or less, O: 0.0040% or less, Ca: 0.0010% or less, Al: 0.005 to 0.060%, N: 0.0020 to 0.0080%, Ti: 0.005 to 0.015%, Nb: 0.015 to 0.045%, Cr: 0 to 1.00%, Mo: 0 to 1.00%, Cu: 0 to 0.50%, Ni: 0 to 0.50%, V: 0 to 0.15%, and the balance: Fe and impurities.
Taizo MAKINO, Masahiro YAMAZAKI, Yuji ARAI, Osamu ENDO, Naoki SERIZAWA, Tatsuya MASUDA
Filed: 13 Feb 20
Utility
Method for Producing Grain Oriented Electrical Steel Sheet
14 Apr 22
A method for producing a grain oriented electrical steel sheet includes a decarburization annealing process where an oxidation degree PH2O/PH2 is controlled, an annealing separator applying process where a mass ratio of MgO and Al2O3 in an annealing separator is controlled, a final annealing process where an oxidation degree is controlled when atmosphere includes hydrogen or a dew point is controlled when atmosphere consists of inert gas, and an insulation coating forming process where a baking temperature and a heat treatment temperature are controlled.
Shinsuke TAKATANI, Yoshiyuki USHIGAMI, Shuichi NAKAMURA, Shunsuke OKUMURA, Shohji NAGANO
Filed: 16 Jan 20
Utility
High-strength Steel Sheet and Method for Manufacturing Same
14 Apr 22
A high-strength steel sheet includes a predetermined chemical composition, a microstructure contains, by volume percentage, 80% or more of tempered martensite, and a remainder consists of ferrite and bainite, the microstructure contains 5.0×1011 pieces/mm3 or more of, per unit volume, precipitate containing Ti and having an equivalent circle diameter of 5.0 nm or less, Hvs/Hvc which is a ratio of an average hardness Hvs at a position of a depth of 20 μm from a surface to an average hardness Hvc at a position of 0.20 to 0.50 mm from the surface is 0.85 or more, and the tensile strength is 1,180 MPa or more.
Masafumi AZUMA, Eisaku SAKURADA, Genki ABUKAWA, Kenichiro OTSUKA, Takeshi TOYODA
Filed: 19 Mar 20
Utility
Plated Steel Sheet
14 Apr 22
A plated steel sheet having excellent post-coating corrosion resistance includes: a steel; and a plating layer that is provided on a surface of the steel, in which the plating layer includes, by mass %, Al: 5.00% to 35.00%, Mg: 2.50% to 13.00%, Fe: 5.00% to 35.00%, Si: 0% to 2.00%, Ca: 0% to 2.00%, and a remainder consisting of Zn and impurities, and in a cross section of the plating layer, the area fraction of a Fe2Al5 phase is 5.0% to 60.0%, the area fraction of an eutectic structure of Zn and MgZn2 is 10.0% to 80.0%, the area fraction of a massive MgZn2 phase is 5.0% to 40.0%, and the area fraction of a remainder is 10.0% or less.
Takuya MITSUNOBU, Jun MAKI, Hiroshi TAKEBAYASHI, Takehiro TAKAHASHI, Kohei TOKUDA
Filed: 16 Apr 20
Utility
Method for producing H-shaped steel
5 Apr 22
A large-size H-shaped steel product is produced by performing a rough rolling step including an edging rolling step of rolling and shaping a material to be rolled into a predetermined almost dog-bone shape, and a flat rolling step of performing rolling of a web part by rotating the material to be rolled after completion of the edging rolling step by 90° or 270°, upper and lower caliber rolls of at least one caliber of calibers configured to perform the flat rolling step include recessed parts configured to form a raised part at a middle of a web part of the material to be rolled, the recessed parts being provided at roll barrel length middle parts of the upper and lower caliber rolls.
Hiroshi Yamashita
Filed: 11 Jan 19
Utility
Threaded connection for pipes and method for producing threaded connection for pipes
5 Apr 22
The threaded connection for pipes includes a pin, a box and a Zn—Ni alloy plating layer.
Masanari Kimoto, Masahiro Oshima
Filed: 30 Aug 18
Utility
Non-oriented electrical steel sheet, manufacturing method of non-oriented electrical steel sheet, and manufacturing method of motor core
5 Apr 22
Yoshiaki Natori, Hiroyoshi Yashiki, Masaru Takahashi, Kazutoshi Takeda, Takuya Matsumoto
Filed: 2 Aug 17