Patents Assigned to Nisshin Steel Company Ltd.
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Patent number: 5277781Abstract: A zirconia oxygen sensor for measuring oxygen potential in the molten bath of a metal or alloy having a melting point of 350-550.degree. C., which comprises a reference electrode which is of a substance having a melting point of the same level as or lower than the metal or alloy of which the oxygen potential is to be measured and being liquid at the measurement temperature and is open to the atmosphere, a vessel of a zirconia solid electrolyte containing 5-10% yttria or 10-20% of calcium oxide (CaO) and a lead wire which connects the reference electrode and said molten metal or alloy and its use are disclosed.Type: GrantFiled: June 18, 1991Date of Patent: January 11, 1994Assignee: Nisshin Steel Company Ltd.Inventors: Shigeo Matsubara, Toshiro Yamada, Yusuke Hirose, Iwao Katayama, Yukimi Miwa, Ryuji Tanoue
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Patent number: 5211771Abstract: Fe-Ni, Fe-Ni-Cr or Fe-Ni-Cr-Mo magnetic alloy material, the surface roughness of which is adjusted to Rz.gtoreq.0.5 or Ra.gtoreq.0.06, is disclosed. Parts made of this material has resistance to mutual adhesion or sticking when they are subjected to anealing treatment.Type: GrantFiled: March 10, 1992Date of Patent: May 18, 1993Assignee: Nisshin Steel Company, Ltd.Inventors: Takuji Okiyama, Ryoji Hirota, Takuji Hara, Yutaka Kawai, Toshihiko Takemoto
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Patent number: 5158624Abstract: An alloy essentially consisting of 35-40% Ni, 5-14% Cr and balance Fe and unavoidable impurities has excellent alternating current magnetic characteristics and good direct current magnetic characteristics.Type: GrantFiled: August 31, 1990Date of Patent: October 27, 1992Assignee: Nisshin Steel Company Ltd.Inventors: Takuji Okiyama, Takuji Hara, Keiji Osaki, Yutaka Kawai
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Patent number: 5135588Abstract: A Ni-Fe-Cr soft magnetic alloy essentially consisting of 40-50% Ni, 0.5-5% Cr and balance Fe and satisfying the following conditions:50.ltoreq.(Ni%)+4.times.(Cr%).ltoreq.60;S+O+B.ltoreq.0.008%;S.ltoreq.0.003%;O.ltoreq.0.005%; andB.ltoreq.0.005%;has excellent magnetic characteristics for magnetic core materials.Type: GrantFiled: March 12, 1991Date of Patent: August 4, 1992Assignee: Nisshin Steel Company Ltd.Inventors: Takuji Okiyama, Takuji Hara, Hisao Yasumura, Yutaka Kawai
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Patent number: 5114799Abstract: Stainless steel sheets are plated with zinc and further phosphated so as to have chromaticness indices of L=45-53, a=0.0-0.4 and b=1.3-4.4. Thus treated stainless steel sheets have sufficient strength, excellent corrosion resistance and a color well harmonizing with other building materials and environment and do not suffer from color change for a prolonged period of time.Type: GrantFiled: January 24, 1991Date of Patent: May 19, 1992Assignees: Nisshin Steel Company, Ltd., Shinsei Kogyo Company, Ltd.Inventors: Hidetsugu Ohashi, Masayuki Kinugasa, Toshiro Adachi, Akihiro Nonomura, Waro Sekimoto
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Patent number: 5035855Abstract: A martensitic precipitation-hardenable stainless steel essentially consisting of, in weight percent, not more than 0.08% C, 0.5-4.0% Si, not more than 4.0% Mn, 5.0-9.0% Ni, 10.0-17.0% Cr, more than 0.3% and up to 2.5% Mo, 0.15-1.0% Ti, not more than 1.0% Al and not more than 0.03% N and the balance being Fe, and inevitable incidental impurities, which may contain 0.3-2.5% Cu is disclosed. This steel has low hardness before aging and exhibits high strength and good toughness after aging.Type: GrantFiled: January 4, 1990Date of Patent: July 30, 1991Assignee: Nisshin Steel Company, Ltd.Inventors: Takeshi Utsunomiya, Kazuo Hoshino, Sadao Hirotsu
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Patent number: 4999159Abstract: A heat-resistant austenitic stainless steel is disclosed. This steel essentially consists of: not more than 0.06% C, 1-4% Si, 0.5-4% mn, not more than 0.035% P, not more than 0.005% S, 10-17% Ni, 14-20% Cr, 1-4% Mo, 0.01-0.5% Al, not more than 0.035% N, and balance essentially Fe, and may further contain small amounts of any of Cu, REM and B and the composition thereof is adjusted so that a limited amount of .delta.-ferrite appears in solidification. The steel has excellent hot salt corrosion resistance, weldability, salt errosion resistance of the weld and hot-workability.Type: GrantFiled: February 13, 1990Date of Patent: March 12, 1991Assignee: Nisshin Steel Company, Ltd.Inventors: Yoshihiro Uematsu, Isami Shimizu, Naoto Hiramatsu
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Patent number: 4940523Abstract: There is disclosed a process for coating fine powder of a metal, a ceramic, a plastic or an organic pigment with a metal or a ceramic comprising: (a) dispersing particles of said fine powder into primary particles by fluid jet mill treatment in an inert atmosphere; (b) heating the dispersed fine powder in an inert atmosphere under reduced pressure; (c) placing the heated powder in an evacuable rotary barrel sputtering chamber, forming a fluidized bed by rotating the barrel at a low speed and coating said fluidized powder by sputtering as the barrel is being rotated. By this process, fine powders of metals, ceramics and plastics having a particle diameter of 0.1-10 .mu.m can be uniformly coated by a metal or a ceramic. There is also provided an apparatus therefor.Type: GrantFiled: May 31, 1989Date of Patent: July 10, 1990Assignee: Nisshin Steel Company Ltd.Inventor: Eiki Takeshima
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Patent number: 4933143Abstract: An austenitic stainless steel having excellent corrosion resistance in hot aqueous medium is disclosed. The steel essentially consists by weight ofC: not more than 0.08%Si: 2.5-4.0%Mn: not more than 0.8%P: not more than 0.045%S: not more than 0.005%Cr: 16-25%Ni: 6-20%Cu: 1.5-4.0%N: not more than 0.05%and the balance Fe and unavoidable incidental impurities.Type: GrantFiled: August 29, 1988Date of Patent: June 12, 1990Assignee: Nisshin Steel Company, Ltd.Inventors: Toshiro Adachi, Atsushi Fujii, Isamu Yoshimura, Tsuguyasu Yoshii
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Patent number: 4913785Abstract: There is disclosed a process for preparing hot-dip metal coated steel sheets having excellent corrosion resistance comprising electrolytically plating steel sheets containing Si and/or Cr with an Fe-B alloy containing 0.001.about.0.3% by weight of B to the thickness of 0.05.about.5 g/m.sup.2 and thereafter hot-dip-coating the thus pre-plated substrate sheets with a molten bath of Zn, Al or Zn-Al alloy. By this process poorly wettable steel sheets containing silicon and/or chromium can be well coated with zinc, aluminum and zinc-aluminum alloy.Type: GrantFiled: January 17, 1989Date of Patent: April 3, 1990Assignee: Nisshin Steel Company, Ltd.Inventors: Yukio Uchida, Yasunori Hattori, Yusuke Hirose, Nobuo Hatanaka, Nobuhiko Sakai
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Patent number: 4878955Abstract: A stainless steel which exhibits substantially martensitic structure at room temperature was heated at a temperature of 550.degree. to 675.degree. for 1 to 30 hours. Then a reverse-transformed austenite phase appeared and a stainless steel having high strength and high elongation and being free from weld softening was obtained.Type: GrantFiled: June 23, 1988Date of Patent: November 7, 1989Assignee: Nisshin Steel Company, Ltd.Inventors: Kazuo Hoshino, Takashi Igawa
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Patent number: 4878960Abstract: There is disclosed a process for preparing alloyed-zinc-plated steel sheet having excellent deep drawability, which comprises adjusting the temperature of substrate steel sheet of titanium-killed steel essentially consisting of C.ltoreq.0.01%, Si<0.15%, Mn: 0.15-0.85%, Ti: 0.05-0.30%, P.ltoreq.0.02%, S.ltoreq.0.02%, Al.ltoreq.0.05% and balance of Fe, to a temperature within a temperature range T(.degree.C.) defined as 180.ltoreq.T.ltoreq.-240.times.W+292, wherein W(%) is the Ti content of the substrate steel sheet, subjecting said steel sheet to Zn-plating by vacuum vapor deposition, and thereafter maintaining the plated steel sheet for alloying the plating zinc layer and the substate steel at 220.degree..about.320.degree. C. for 1-50 hours in accordance with Ti content of the substrate steel. This process provided alloyed zinc-plated steel sheets having excellent drawability and powdering resistance.Type: GrantFiled: February 6, 1989Date of Patent: November 7, 1989Assignee: Nisshin Steel Company, Ltd.Inventors: Nobuhiko Sakai, Yukio Uchida, Eizo Wada, Yusuke Hirose
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Patent number: 4849166Abstract: There is disclosed a high strength stainless steel consisting essentially of not more than 0.10% C., more than 1.5% and not more than 2.95% Si, less than 0.5% Mn, not less than 4.0% and not more than 8.0% Ni, not less than 12.0% and not more than 18.0% Cr, not less than 0.5% and not more than 3.5% Cu, not more than 0.15% N and not more than 0.004% S, wherein the total content of C and N is not less than 0.10%, the balance is Fe and incidental impurities, said steel satisfies the relations A'>42, and 35<Md(N)<95, wherein A'=17.times.(C % / Ti %)+0.70.times.(Mn %)+1 x-(Ni %)+0.60.times.(Cr %)+0.76 (Cu %)-0.063.times.(Al %) and Md(N)=580-520 (C %)-2 (Si %)-16 (Mn %)-16 (Cr %)-23 (Ni %)-300 (N %)-26 (Cu %). This steel is inexpensive and can be provided with high strength and high ductility by cold working and aging.Type: GrantFiled: September 12, 1988Date of Patent: July 18, 1989Assignee: Nisshin Steel Company, Ltd.Inventors: Kazuo Hoshino, Sadao Hirotsu, Sadayuki Nakamura
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Patent number: 4847169Abstract: Alloyed-zinc-plated steel sheet the alloyed layer of which is minutely cellulated is disclosed. Such an alloyed-zinc-plated steel sheet can be prepared by carrying out the vacuum deposition plating in an inert atmosphere containing 1.0-30 ppm oxygen by volume oxygen and subjecting the plated steel sheet to an alloying heat treatment.Type: GrantFiled: December 29, 1987Date of Patent: July 11, 1989Assignee: Nisshin Steel Company, Ltd.Inventors: Nobuhiko Sakai, Yukio Uchida, Eizo Wada, Yusuke Hirose
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Patent number: 4643131Abstract: Disclosed is a combined continuous plating apparatus for hot-dip plating and vacuum deposition plating characterized in that the outlet of the gas reduction annealing furnace of a conventional continuous hot-dip plating apparatus and the inlet of the seal roll chamber of a known continuous vacuum deposition plating apparatus are connected through a pressurized chamber in order to prevent invasion of hydrogen-containing reduction gas into the vacuum deposition chamber, whereby is prevented the possibility of the hydrogen-containing gas causing an explosion should air leak into the vacuum deposition chamber.Type: GrantFiled: September 20, 1985Date of Patent: February 17, 1987Assignees: Nisshin Steel Company, Ltd., Mitsubishi Jukogyo Kabushiki KaishaInventors: Shozo Umeda, Norio Tsukiji, Takuya Aiko, Toshiharu Kittaka, Heizaburo Furukawa, Kanji Wake, Yoshio Shimozato, Kenichi Yanagi, Mitsuo Kato, Tetsuyoshi Wada
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Patent number: 4612206Abstract: In a continuous vacuum deposition plating of a metal strip, thinner coating at the edges can be prevented by maintaining the pressure of the deposition chamber in which an evaporation chamber is housed at a properly higher level than the pressure of the evaporation chamber.Type: GrantFiled: June 3, 1985Date of Patent: September 16, 1986Assignees: Nisshin Steel Company, Ltd., Mitsubishi Jukogyo Kabushiki KaishaInventors: Yoshio Shimozato, Tetsuyoshi Wada, Kenichi Yanagi, Mitsuo Kato, Heizaburo Furukawa, Kanji Wake, Arihiko Morita, Norio Tsukiji, Takuya Aiko, Toshiharu Kittaka, Yasuji Nakanishi
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Patent number: 4587134Abstract: In the continuous vapor deposition coating of a metal strip, the coating amount can be rapidly changed by keeping the vapor flow at acoustic velocity and changing the cross-sectional area of the vapor path.Type: GrantFiled: May 17, 1985Date of Patent: May 6, 1986Assignees: Nisshin Steel Company, Ltd., Mitsubishi Jukogyo Kabushiki KaishaInventors: Yoshio Shimozato, Tetsuyoshi Wada, Kenichi Yanagi, Mitsuo Kato, Heizaburo Furukawa, Kanji Wake, Arihiko Morita, Norio Tsukiji, Takuya Aiko, Toshiharu Kittaka, Yasuji Nakanishi
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Patent number: 4581107Abstract: Improved Zn-Ni-alloy-electroplated steel sheet can be prepared by electroplating steel sheet with an acid electroplating bath containing Zn ions, Ni ions and a small amount of titanium ions, preferably after pre-electroplating with an electroplating bath containing Zn ions and a larger amount of Ni ions and heating the plating sheet in the presence of water.Type: GrantFiled: August 24, 1984Date of Patent: April 8, 1986Assignee: Nisshin Steel Company, Ltd.Inventors: Taisuke Irie, Yoshitaka Nakagawa, Masayoshi Tatano, Koichi Watanabe, Eiji Watanabe
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Patent number: 4550487Abstract: In the conventional process of manufacturing sheets of metastable austenitic stainless steel, a mechanical polishing step is included before or after the final temper rolling step. By insertion of this step, the fatigue resistance of the produced steel strips and sheets is remarkably improved.Type: GrantFiled: September 28, 1982Date of Patent: November 5, 1985Assignee: Nisshin Steel Company, Ltd.Inventors: Kazuo Hoshino, Teruo Tanaka, Kenjiro Ito
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Patent number: 4508600Abstract: The adhesion of a corrosion resisting Zn-Ni-alloy plated layer on a steel sheet is improved by pre-plating the steel substrate with a Zn-Ni layer containing Ni in an amount higher than said Zn-Ni-alloy plated layer.Type: GrantFiled: April 18, 1984Date of Patent: April 2, 1985Assignee: Nisshin Steel Company, Ltd.Inventors: Taisuke Irie, Yoshitaka Nakagawa, Masayoshi Tatano, Koichi Watanabe, Eiji Watanabe