Specific Crystallographic Orientation Patents (Class 148/308)
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Patent number: 5192375Abstract: An Fe-based soft magnetic alloy essentially consisting of an Fe-based alloy including fine crystal grains used for such as a magnetic core. An average size of the fine crystal grains is controlled to 300.ANG. or less. Each of the fine crystal grains is composed of a body-centered cubic phase at least partially including a super lattice. This alloy has a high saturation flux density and excellent soft magnetic characteristics such as a low iron loss and a high magnetic permeability. This alloy is suitable as a core material for various kinds of choke coils.Type: GrantFiled: March 26, 1991Date of Patent: March 9, 1993Assignee: Kabushiki Kaisha ToshibaInventors: Takao Sawa, Masami Okamura, Yumiko Takahashi
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Patent number: 5173129Abstract: A grain-oriented silicon steel sheet having a low iron loss free from deterioration due to the stress-relief annealing, can be obtained by forming on its surface a forsterite film locally having regions, which have a thickness different from that of the remaining regions in the film, or locally having filmless regions which do not coat the steel sheet surface.Type: GrantFiled: December 8, 1989Date of Patent: December 22, 1992Assignee: Kawasaki Steel CorporationInventors: Ujihiro Nishiike, Michiro Komatsubara, Yoshiaki Iida, Isao Matoba
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Patent number: 5135818Abstract: Disclosed is a soft magnetic film comprising a thin film of magnetic material of cubic symmetry, characterized in that crystal face (111) of the thin film is oriented substantially parallel to the surface of the thin film.Type: GrantFiled: March 26, 1990Date of Patent: August 4, 1992Assignee: Hitachi Maxell, Ltd.Inventors: Yutaka Shimada, Akihiko Hosono, Hideo Fujiwara
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Patent number: 5125991Abstract: A silicon-containing steel sheet having a low iron loss has such a crystal structure that crystal grains having an inclination angle of {110} face of not more than 10.degree. with respect to the sheet surface are included in an amount of not less than 80 vol % and exhibit a graining surface pattern in which boundaries of these crystal grains form stepwise difference or groove of not less than 0.4 .mu.m as a maximum height. This sheet is produced by subjecting a grain oriented silicon steel sheet after final annealing to a magnetically smoothening treatment by electrolysis in an squeous solution containing at least one of water soluble halides.Type: GrantFiled: October 19, 1990Date of Patent: June 30, 1992Assignee: Kawasaki Steel CorporationInventors: Hirotake Ishitobi, Ujihiro Nishike, Shigeko Sujita, Tikara Kami, Yasuhiro Kobayashi
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Patent number: 5067992Abstract: A steel sheet (10) having a stress-relief annealed, structure with a plurality of magnetic domains (12) is made by drilling a plurality of closely spaced, small holes (15) through the entire thickness of the steel sheet, where the drilling is effective to form additional domain walls (17) and subdivide the magnetic domains.Type: GrantFiled: September 14, 1990Date of Patent: November 26, 1991Assignee: ABB Power T & D Company, Inc.Inventors: Norman M. Pavlik, John Sefko, Richard A. Miller
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Patent number: 5067993Abstract: A magnetic core material made of a Fe-Co base alloy for use at high frequencies, and has excellent high-frequency alternating magnetic properties. The core material composition is Co: 45-53% by weight, C: 0.3-3% by weight, one or both of Mn and Si: 0.1-2% by weight, at least one of Mg, Ca, and Ce: 0.1-0.2% by weight, and the remainder Fe and unavoidable impurities. The structure of the alloy comprises a ferrite matrix containing graphite in an amount of from 1-20% by volume dispersed therein. The material is applied, for example, in a dot impact printer and to a pulse motor.Type: GrantFiled: April 14, 1989Date of Patent: November 26, 1991Assignee: Mitsubishi Materials CorporationInventors: Saburo Wakita, Kiyoshi Yamaguchi, Norio Yanagisawa
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Patent number: 5032190Abstract: The process of the invention provides an improved method for forming sheet of iron-base ODS alloys. Powder containing iron and a substantially uniformly distributed oxide dispersoid is hot compacted into a billet. The billet is hot rolled in a first direction to introduce a predetermined amount of cold work into said billet. The hot rolled billet is then cold rolled in a second direction substantially perpendicular to said first direction after the hot rolling to form the iron-base ODS sheet. The cold rolling also introduces a predetermined amount of cold work into the billet. Preferably, the hot rolling and cold rolling are balanced to produce substantially uniform properties in the transverse and longitudinal directions.Type: GrantFiled: April 24, 1990Date of Patent: July 16, 1991Assignee: Inco Alloys International, Inc.Inventors: Francis S. Suarez, James D. Vandevender, Vernon L. Maynard
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Patent number: 5019190Abstract: An Fe-based soft magnetic alloy essentially consisting of an Fe-based alloy including fine crystal grains used for such as a magnetic core. An average size of the fine crystal grains is controlled to 300 .ANG. or less. Each of the fine crystal grains is composed of a body-centered cubic phase at least partially including a super lattice. This alloy has a high saturation flux density and excellent soft magnetic characteristics such as a low iron loss and a high magnetic permeability.Type: GrantFiled: December 20, 1989Date of Patent: May 28, 1991Assignee: Kabushiki Kaisha ToshibaInventors: Takao Sawa, Masami Okamura, Yumiko Takahashi
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Patent number: 4963199Abstract: A steel sheet (10) having a stress-relief annealed, structure with a plurality of magnetic domains (12) is made by drilling a plurality of closely spaced, small holes (15) through the entire thickness of the steel sheet, where the drilling is effective to form additional domain walls (17) and subdivide the magnetic domains.Type: GrantFiled: October 14, 1988Date of Patent: October 16, 1990Assignee: ABB Power T&D Company, Inc.Inventors: Norman M. Pavlik, John Sefko, Richard A. Miller
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Patent number: 4960652Abstract: A grain-oriented electromagnetic steel sheet has an ultra low watt loss and heat resistant subdivided magnetic domains. The electromagnetic steel sheet has spaced apart regions of plastic strain and an insulating coating disposed thereon. Intruders are thermally intruded into the spaced apart regions of plastic strain causing the subdivided magnetic domains to be heat resistant and maintaining the subdivided magnetic domains after stress relief annealing. Preferred intruders include Sb and Sb containing materials.Type: GrantFiled: January 22, 1990Date of Patent: October 2, 1990Assignee: Nippon Steel CorporationInventors: Toshiya Wada, Osamu Tanaka, Takatoshi Egawa, Makato Yoshida, Seizun Higuchi, Teruaki Izaki
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Patent number: 4952253Abstract: A grain-oriented silicon steel sheet having a low iron loss, due to the subdividing effect of magnetic domain wall spacing, free from deterioration due to the stress-relief annealing, can be obtained by forming on its surface a forsterite film locally having regions, which have a thickness different from that of the remaining regions in the film, or locally having filmless regions which do not coat the steel sheet surface.Type: GrantFiled: November 5, 1987Date of Patent: August 28, 1990Assignee: Kawasaki Steel CorporationInventors: Ujihiro Nishiike, Michiro Komatsubara, Yoshiaki Iida, Isao Matoba
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Patent number: 4946746Abstract: A metal fiber having unidirectional dendritic texture which is an assembly of a group of dendrites wherein primary arms have grown at angle of within 20.degree. relative to the metal fiber axis, diameter of said fiber being not greater than 100 .mu.m. There is also disclosed a single crystalline metal fiber which is a single crystalline material throughout the entire length, diameter of said fiber being not greater than 100 .mu.m, length of said fiber being not less than 40 mm. These fibers can be produced by melt-spinning of metal.Type: GrantFiled: December 6, 1988Date of Patent: August 7, 1990Assignee: Toyo Boseki Kabushikia KaishaInventors: Takaharu Ichiryu, Yoshiki Ono, Hideaki Ishihara
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Patent number: 4929286Abstract: In the production of a grain-oriented electrical steel sheet, instead of conventional inhibitors a novel (Al, Si)N inhibitor is utilized. This inhibitor is formed by obtaining an incomplete solution of Al and N and then nitriding the decarburization annealed steel sheet prior to initiation of a secondary recrystallization. The fine inhibitor can be formed in a large amount, thereby enhancing the magnetic flux density.Type: GrantFiled: October 7, 1988Date of Patent: May 29, 1990Assignee: Nippon Steel CorporationInventors: Hajime Komatsu, Mitsuro Tanino, Yozo Suga, Toyohiko Konno
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Patent number: 4904312Abstract: This invention relates to a method of enhancing linear impressions formed in the surface of grain oriented electrical steel strip, by electrolytically etching said impressions with e.g. citric acid. The impressions may be formed by mechanical wheel scribing or by surface ablation, e.g. by spark discharge or laser treatment, and may be continuous or discontinuous in the form of spots or lines. In accordance with this invention therefore, the initial generation of light impressions in steel strip formed by mechanical wheel scribing or spark ablation techniques can readily be enhanced by application of the electrolytic etching technique to produce a material exhibiting values of power loss (reduced from the original unscribed loss value) which are substantially anneal-proof. In comparison, conventionally scribed material shows no resistance to a high temperature anneal as far as loss reduction is concerned.Type: GrantFiled: August 10, 1988Date of Patent: February 27, 1990Assignee: British Steel plcInventors: Philip Beckley, David Snell
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Patent number: 4897131Abstract: The adhesiveness of a glass film and watt loss of a grain-oriented electrical steel sheet is improved by partially protruding the glass film into the steel sheet part thereof. To attain the partial protrusion, the steel sheet is subjected, prior or subsequent to decarburization annealing, to a treatment of the surface thereof to form unevenness, by a mechanical device, e.g., brush rolling, buff polishing, marking-off, sand papering, and grinding.Type: GrantFiled: December 5, 1986Date of Patent: January 30, 1990Assignee: Nippon Steel CorporationInventors: Toshiya Wada, Osamu Tanaka, Toshihiko Takata, Kunihide Takashima, Hiromichi Yasumoto
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Patent number: 4773931Abstract: Disclosed herein is spindle ferromagnetic alloy particles having the aspect ratio (major:minor) of less than 3:1 and the coercive force of 500 to 100 Oe, and containing 0.1 to 13 atomic % of Si to Fe, and a process for producing the same.Type: GrantFiled: January 23, 1987Date of Patent: September 27, 1988Assignee: Toda Kogyo Corp.Inventors: Akio Mishima, Yosiro Okuda, Hiroshi Sumita, Yoshitaka Yoshinaga, Akira Mukaizaka, Tokihiro Kurata
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Patent number: 4698272Abstract: An extra-low iron loss grain oriented silicon steel sheet comprises a base metal of silicon steel and a thin coat of nitride or carbide of Ti, Zr, Hf, V, Nb, Ta, Mn, Cr, Mo, W, Co, Ni, Al, B and Si and strongly adhered to a finished surface of the base metal through a mixed layer of the base metal and the thin coat, and has excellent electrical and magnetic properties as well as good compressive stress dependence of magnetostriction and lamination factor.Type: GrantFiled: February 21, 1986Date of Patent: October 6, 1987Assignee: Kawasaki Steel CorporationInventors: Yukio Inokuti, Yo Ito
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Patent number: 4693762Abstract: A method is provided for final texture annealing silicon steel to produce a cube-on-edge grain orientation having lower core losses and higher magnetic permeability. The method includes using a controlled heating cycle including a substantially isothermal hold at a selected recrystallization temperature of about 1650.degree. F. to improve secondary recrystallization and the Goss texture (110) [001].Type: GrantFiled: August 8, 1985Date of Patent: September 15, 1987Assignee: Allegheny Ludlum CorporationInventor: Frank A. Malagari, Jr.
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Patent number: 4692193Abstract: A thin-gauge (0.10-0.23 mm thick) grain-oriented electrical steel sheet is produced by a process characterized by a decarburization which is carried out after the hot-rolling and before the final cold-rolling, after which the known, decarburization annealing and finishing annealing are carried out. The steel composition is adjusted to induce the secondary recrystallization by the AlN inhibitor. The reduction at the final cold-rolling is determined to be high to obtain a high magnetic flux density but tends to instabilize the secondary recrystallization unless the inventive decarburization is carried out.Type: GrantFiled: October 25, 1985Date of Patent: September 8, 1987Assignee: Nippon Steel CorporationInventors: Yasunari Yoshitomi, Katsuro Kuroki, Kenzo Iwayama
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Patent number: 4623406Abstract: The present invention relates to a method for producing a grain-oriented electrical steel sheet.A feature of the present invention is to set S.ltoreq.0.007%, Mn=0.08.about.0.45%, P=0.015.about.0.45% in a slab. The present inventive idea does away with the conventional concept of using MnS as an inhibitor. The present invention present incomplete secondary recrystallization by the S content, which is decreased to a level as low as possible. In addition, a product having a high magnetic flux density can be successfully produced by adding appropriate amounts of Mn and P. Due to these advantages a high Si content of a slab, which leads to a watt loss reduction, can also be employed in the present invention. Furthermore, the watt loss of a product produced by a low-temperature slob-heating is considerably lower than a product produced by a high-temperature slab-heating.Type: GrantFiled: September 21, 1983Date of Patent: November 18, 1986Assignee: Nippon Steel CorporationInventors: Yozo Suga, Fumio Matsumoto, Tadashi Nakayama
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Patent number: 4623407Abstract: The present invention relates to a method for producing a grain-oriented electrical steel sheet.A feature of the present invention is to set S.ltoreq.0.007%, Mn=0.08.about.0.45%, P=0.015.about.0.45% in a slab. The present inventive idea does away with the conventional concept of using MnS as an inhibitor. The present invention present incomplete secondary recrystallization by the S content, which is decreased to a level as low as possible. In addition, a product having a high magnetic flux density can be successfully produced by adding appropriate amounts of Mn and P. Due to these advantages, a high Si content of a slab, which leads to a watt loss reduction, can also be employed in the present invention. In addition according to the present invention, the temperature of slab heating, which is carried out prior to hot rolling, can be drastically decreased as compared with the prior art.Type: GrantFiled: September 21, 1983Date of Patent: November 18, 1986Assignee: Nippon Steel CorporationInventors: Yozo Suga, Toyohiko Konno, Tadashi Nakayama
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Patent number: 4615750Abstract: The present invention relates to a process for producing a grain-oriented electrical steel sheet by means of the so-called double-rolling process, using Mn, S, and Cu as the precipitation dispersion phases for suppressing the growth of primary-recrystallized crystal grains.A new concept according to the present invention is to suppress the growth of primary crystals by means of an element segregated in the grain boundaries of primary-recrystallized crystals.The present invention is characterized in that the silicon steel starting material contains T.[N] in an amount which satisfies the following formulas (1) and (2):T.[N].gtoreq.{[sol Al%].times.(14/27)+0.0020}(%) (1)T.[N].ltoreq.{[sol Al%].times.(14/27)+0.0060}(%) (2).Type: GrantFiled: May 11, 1984Date of Patent: October 7, 1986Assignee: Nippon Steel CorporationInventors: Kishio Mochinaga, Kohichi Fujiwara, Kazutaka Higashine, Hisashi Kobayashi