Patents by Inventor Rikizo Watanabe
Rikizo Watanabe has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 6221183Abstract: A high-strength low-thermal-expansion alloy consisting of, by weight, 0.06 to 0.50% C, 25 to 65% in total of one or both of 65% or less Co and less than 30% Ni, and balance of Fe as a main component, other optional elements and unavoidable impurities, and having a primary phase of austenite phase and martensite phase induced by working. A wire is made from the alloy.Type: GrantFiled: November 15, 1993Date of Patent: April 24, 2001Assignee: Hitachi Metals, Ltd.Inventors: Koji Sato, Rikizo Watanabe, Takehiro Ohno, Yoshiki Masugata, Minoru Takuwa, Shigeaki Sato, Yoshimi Senda
-
Patent number: 5358577Abstract: A high strength, high toughness stainless steel consisting, by weight, of C more than 0.16% but less than 0.25%, Si not more than 2.0%, Mn not more than 1.0%, Ni not more than 2.0%, Cr from 11 to 15%, Mo not less than 0.5% but less than 3.0%, Co from 12 to 21%, at least one kind selected from the group consisting of V from 0.1 to 0.5% and Nb less than 0.1% which at least one kind is added as occasion demands, and the balance Fe and incidental impurities. This steel is produced by a method comprising the steps of: preparing a stainless steel having the composition of any one of the claims 1 to 4; subjecting the stainless steel to a solution heat treatment at a temperature of 950 to 1150.degree. C.; quenching the steel; subjecting the steel to a sub zero treatment at a temperature of -50.degree. to -100.degree. C.; and subjecting the steel to a tempering at a temperature of 120.degree. to 450.degree. C.Type: GrantFiled: July 20, 1993Date of Patent: October 25, 1994Assignees: Hitachi Metals, Ltd., The Society of Japanese Aerospace Companies, Inc., Sumitomo Precision Products Co., Ltd.Inventors: Toshihiro Uehara, Rikizo Watanabe, Nobuhito Nakama
-
Patent number: 5288347Abstract: A high strength, high toughness stainless steel consisting, by weight, of C more than 0.16% but less than 0.25%, Si not more than 2.0%, Mn not more than 1.0%, Ni not more than 2.0%, Cr from 11 to 15%, Mo not less than 0.5% but less than 3.0%, Co from 12 to 21%, at least one kind selected from the group consisting of V from 0.1 to 0.5% and Nb less than 0.1% which at least one kind is added as occasion demands, and the balance Fe and incidental impurities. This steel is produced by a method comprising the steps of: preparing a stainless steel having the composition of any one of the claims 1 to 4; subjecting the stainless steel to a solution heat treatment at a temperature of 950.degree. to 1150.degree. C.; quenching the steel; subjecting the steel to a sub zero treatment at a temperature of -50 to -100.degree. C.; and subjecting the steel to a tempering at a temperature of 120.degree. to 450.degree. C.Type: GrantFiled: June 4, 1992Date of Patent: February 22, 1994Assignees: Hitachi Metals, Ltd., Society of Japanese Aerospace Companies, Inc., Sumitomo Precision Products Co., Ltd.Inventors: Toshihiro Uehara, Rikizo Watanabe, Nobuhito Nakama
-
Patent number: 5147470Abstract: A high strength lead frame material consists essentially, by weight, of 0.5 to 22% Co, 22 to 32.5% Ni, not more than 1.0% Mn and not more than 0.5% Si and the balance Fe and incidental impurities. The contents of Ni and Co are selected so that the Ni content is 27 to 32.5% when the Co content is less than 12%, and so that, when the Co content is not less than 12%, the Ni content and the Co content meet the condition of 66%.ltoreq.2Ni+Co.ltoreq.74%. The material has a multi-phase structure formed of austenitic phase, martensitic phase, and ferritic phase, the austenitic phase occupying not less than 50% of the structure.The method of producing the alloy of the invention comprises the steps of solid-solutioning the material of the above composition at a temperature not less than austenitizing completion temperature, cold-rolling the material at a rate of 40 6to 90% in reduction, and annealing the material at a temperature less than the austenitizing completion temperature.Type: GrantFiled: March 7, 1991Date of Patent: September 15, 1992Assignee: Hitachi Metals, Ltd.Inventors: Shuichi Nakamura, Hakaru Sasaki, Rikizo Watanabe
-
Patent number: 5141704Abstract: The improved superalloy that possesses all the characteristics required of the high-temperature structural material of high-temperature gas-cooled reactors (i.e., high-temperature strength, corrosion resistance, good productibility, good hot workability and resistance to embrittlement due to thermal aging) consists essentially of 16-28% Cr. 15-24% W (provided that Cr+W=39-44%), 0.01-0.1% Zr, 0.001-0.015% Y, 0.0005-0.01% B, up to 0.05% C, up to 0.1% Si, up to 0.1% Mn (provided that Si+Mn.gtoreq.0.1%), up to 0.1% Ti, up to 0.1% Al and up to 0.1% Nb (provided that Ti+Al.gtoreq.0.1% and Ti+Al+Nb.gtoreq.0.15%), with the balance being Ni and inevitable impurities and all percentages being on a weight basis.Type: GrantFiled: July 26, 1991Date of Patent: August 25, 1992Assignee: Japan Atomic Energy Res. InstituteInventors: Tatsuo Kondo, Hajime Nakajima, Masami Shindo, Hirokazu Tsuji, Ryohei Tanaka, Susumu Isobe, Sadao Ohta, Rikizo Watanabe
-
Patent number: 5131961Abstract: A method of forming a Ni-base superalloy suitable for use as the material for gas turbine disks or the like has a composition containing, by weight, 0.01 to 0.15% of C, 15 to 22% of Cr, 3 to 6% of Mo, 3 to 6% of W, 5 to 15% of Co, 1.0 to 1.9% of Al, 1.5 to 3.0% of Ti, 3.0 to 6.0% of Ta, 0.001 to 0.020% of B and the balance substantially Ni except inevitable impurities. This alloy is produced using the conventional ingot making and a hot working process including working at a reducing ratio greater than or equal to 10%, first above the .gamma. solvus temperature, and then during cooling to the recrystallization temperature and then subjected to direct aging without solid-solution treatment. As a result, the alloy exhibits excellent strength properties well comparable to those of expensive alloys produced by powder metallurgy process.Type: GrantFiled: September 27, 1989Date of Patent: July 21, 1992Assignee: Hitachi Metals, Ltd.Inventors: Koji Sato, Rikizo Watanabe
-
Patent number: 5096514Abstract: A heat-resistant ferritic cast steel having excellent thermal fatigue resistance, consisting, by weight, of 0.25 to 0.45% C, 0.3 to 2.0% Si, not more than 1.0% Mn, 17 to 22% Cr, at least one kind selected from the group consisting of not more than 6% Co and not more than 1.5% Ni, the amount of % Co+3 % Ni being in the range of 1 to 6%, 0.006 to 0.1% of at least one kind selected from the group consisting of Y and rare earth elements, and the balance Fe and incidental impurities, the ferritic cast steel being composed of a structure in which .alpha. ferrite and M.sub.23 C.sub.6 carbide are dispersed in .delta. ferrite. With this specific composition, even at high temperatures, there can be maintained the structure which has the .alpha. ferrite and the M.sub.23 C.sub.6 dispersed in the .delta. ferrite, with the result that there is obtained an excellent thermal fatigue resistance, and in this structure, the transformation under heating will not occur even at a temperature of about 1,000.degree. C.Type: GrantFiled: January 30, 1991Date of Patent: March 17, 1992Assignee: Hitachi Metals, Ltd.Inventors: Rikizo Watanabe, Koji Sato
-
Patent number: 5096664Abstract: Alloys according to the present invention exhibit good resistance to erosion and stress corrosion cracking. The contents of individual components in these alloys as expressed in terms of wt. % are as follows:______________________________________ 0.35 .ltoreq. C .ltoreq. 1.7, Si .ltoreq. 2.5, 10 .ltoreq. Mn .ltoreq. 25, 6 .ltoreq. Cr .ltoreq. 20, 0.5 .ltoreq. V .ltoreq. 7, 0.5 .ltoreq. Nb .ltoreq. 3, and N .ltoreq. 0.1, Fe = balance. ______________________________________Further, a mutual relationship represented by the following formula is maintained amoung the contents of V, Nb and C:(V/5+Nb/8)/C.gtoreq.1.Type: GrantFiled: January 30, 1991Date of Patent: March 17, 1992Assignee: Agency of Industrial Science and TechnologyInventors: Toshihiro Uehara, Rikizo Watanabe
-
Patent number: 5064610Abstract: A heat resistant steel for use as a material of engine valves, having a composition containing, not less than 0.01% and below 0.20% of carbon, from 0.05% to 1.0% of silicon, from 7.5% to 15.0% of manganese, from 2.0% to 20.0% in total of at least one of nickel and cobalt, from 15.0% to 25.0% of chromium, not more than 3.0% of molybdenum, above 2.0% and not more than 10.0% of tungsten, not less than 0.01% and below 0.50% of niobium, from 0.30% to 0.65% of nitrogen, not more than 0.02% of boron, and the balance incidental inclusions and iron. Cobalt content is determined to meet the condition of % Co=(Ni.+-.5)%. The heat resistant steel meets the conditions of: oxidation weight loss when held at 1000.degree. C. for 100 hours being not greater than 0.15 mg/cm.sup.2 /hour in atmosphere; tensile strength being not less than 20 kgf/mm.sup.2 at 900.degree. C. after a solution treatment at 1030.degree. to 1070.degree. C. and a subsequent aging treatment; and creep rupture life at 900.degree. C.Type: GrantFiled: July 30, 1990Date of Patent: November 12, 1991Assignee: Hitachi Metals, Ltd.Inventors: Koji Sato, Rikizo Watanabe
-
Patent number: 5061440Abstract: A ferritic heat resisting steel usable as the material of parts of steam and gas turbines of a power generating plant. Co content and Mo content are increased as compared with known alloy steels of the same kind. For instance, the alloy steel has a composition containing, by weight, 0.05 to 0.20% C, 0.05 to 1.5% Mn, 0.05 to 1.0% Ni, 9.0 to 13.0% Cr, 0.05 to less than 0.50% Mo, 2.0 to 3.5% W, 0.05 to 0.30% V, 0.01 to 0.20% Nb, 2.1 to 10.0% Co, 0.01 to 0.1% N, and the balance substantially Fe and incidental impurities, with Si as an impurity limited to be not more than 0.15%.Type: GrantFiled: July 2, 1990Date of Patent: October 29, 1991Assignee: Hitachi Metals, Ltd.Inventors: Rikizo Watanabe, Toshio Fujita
-
Patent number: 5026435Abstract: A high strength lead frame material consists, by weight, of 0.5 to 22% Co, 22 to 32.5% Ni, not more than 1.0% Mn and not more than 0.5% Si and the balance Fe and incidental impurities. The contents of Ni and Co are selected so that the Ni content is 27 to 32.5% when the Co content is less than 12%, and so that, when the Co content is not less than 12%, the Ni content and the Co content meet the condition of 66%.ltoreq. 2Ni+Co.ltoreq.74%. The material has a two-phase structure formed of austenitic phase and martensitic phase, the austenitic phase occupying not less than 50% of the structure.Type: GrantFiled: June 25, 1990Date of Patent: June 25, 1991Assignee: Hitachi Metals, Ltd.Inventors: Shuichi Nakamura, Hakaru Sasaki, Rikizo Watanabe
-
Patent number: 4979995Abstract: A member adapted for use under a stress in an atmosphere of a temperature below the creep temperature and made from an Ni base alloy having a high resistance to stress corrosion cracking. The Ni alloy consists essentially of, by weight, 15 to 25% of Cr, 1 to 8% of Mo, 0.4 to 2% of Al, 0.7 to 3% of Ti, 0.7 to 4.5% of Nb and the balance Ni, and has an austenite matrix in which precipitated is at least one of .gamma.' phase and .gamma." phase. The member can suitably used as parts which are subjected to pure water in nuclear reactor.Type: GrantFiled: March 31, 1989Date of Patent: December 25, 1990Assignees: Hitachi, Ltd., Hitachi Metals, Ltd.Inventors: Shigeo Hattori, Rikizo Watanabe, Yasuhiko Mori, Isao Masaoka, Ryoichi Sasaki, Hisao Itow
-
Patent number: 4976791Abstract: This invention relates to a heat resistant single-crystal nickel-base super alloy that possesses microstructural stability and excellent creep rupture strength and oxidation resistance. This alloy is composed of 4-9% chromium, 4-6.5% aluminum, 5-8.5% wolfram, 5-8.5% tantalum, 3-6% molybdenum, 0.01-0.30% hafnium, 0.02-4% cobalt by weight, and the balance of nickel and incidental elements and meets the conditional expression wolfram+tantalum<16%. The preferable chemcial composition of this alloy is approximately 6.4% chromium, approximately 5.1% aluminum, approximately 7.3% wolfram, 7.3% tantalum, approximately 4.3% molybdenum, approximately 0.1% hafnium, approximately 1% cobalt by weight, and the balance of nickel and incidental elements.Type: GrantFiled: January 19, 1990Date of Patent: December 11, 1990Assignee: Hitachi Metals, Ltd.Inventors: Takehiro Ohno, Rikizo Watanabe
-
Patent number: 4882124Abstract: The alloys of this invention illustrate good property on erosion resistance. The compositions of these alloys are C: more than 0.09 wt. % and less than 1.7 wt. %, Si: 2.5 wt. % or less, Mn: 10-25 wt. %, Cr: 6-20 wt. %, V: more than 4 wt. % and less than 7 wt. % , N: 0.1 wt. % or less, and Fe: the rest. Optional small content is Ni and /or Mo.Type: GrantFiled: October 11, 1988Date of Patent: November 21, 1989Assignee: Extra-Ministerial Bureau of Ministry of Trade & Industry Agency of Industrial Science & TechnologyInventors: Toshihiro Uehara, Rikizo Watanabe
-
Patent number: 4802934Abstract: A single-crystal Ni-based super-heat-resistant alloy consisting essentially of, by weight percentage, 4 to 10% of Cr, 4 to 6.5% of Al, 4 to 10% of W, 4 to 9% of Ta, 1.5 to 6% of Mo, and the balance substantially Ni and impurities; or the alloy containing not greater than 12% of Co in addition to the above composition; wherein the contents of W, Ta and Mo are selected to meet the following condition: 1/2.W+1/2.Ta+Mo=9.5% to 13.5%.Type: GrantFiled: November 5, 1986Date of Patent: February 7, 1989Assignee: Hitachi Metals, Ltd.Inventors: Takehiro Ohno, Rikizo Watanabe
-
Patent number: 4754188Abstract: A color picture tube shadow mask material is made of an alloy consisting of 30 to 45 wt. % of Ni, 0.1 to 5.0 wt. % of V, and the balance essentially Fe. A color picture tube having a shadow mask consisting of this material is also prepared. The alloy has an average thermal expansion coefficient of 6.times.10.sup.-6 /.degree.C. or less in a temperature range of 20 to 100.degree. C., and an elasticity coefficient of 15,000 kgf/mm.sup.2 or more.Type: GrantFiled: April 18, 1986Date of Patent: June 28, 1988Assignees: Hitachi, Ltd., Hitachi Metals, Ltd.Inventors: Rikizo Watanabe, Akira Misumi, Ryoji Hirai
-
Patent number: 4740354Abstract: A nickel-base cast alloy for use in high-temperature forging dies operable in the atmosphere, consisting essentially of 4-10 weight % of Al, 13-23 weight % of Mo and the balance of Ni and impurities. The nickel-base cast alloy may further contain up to 0.1 weight % of at least one of rare earth metals and Y. It may also contain up to 15 weight % of W and/or Ta substituting for a part of Mo. Ni may be replaced by up to 20 weight % of Co. The cast alloy of the present invention has high resistance to compression deformation and oxidation.Type: GrantFiled: September 19, 1986Date of Patent: April 26, 1988Assignee: Hitachi, Metals Ltd.Inventors: Rikizo Watanabe, Takehiro Ohno, Toshiaki Nonomura
-
Patent number: 4732733Abstract: A copper-base alloy for leadframes consisting essentially of 0.8-4.0 weight % of Ni, 0.2-4.0 weight % of Ti and 0.05-0.6 weight % of Mg, the balance being essentially Cu and inevitable impurities, and a ratio of Ni to Ti being 1-4. This copper-base alloy has high mechanical strength of about 50 kgf/mm.sup.2 or more and electric conductivity of 30% IACS or more as well as good solderability and solder durability. Thus, it may be used as a highly reliable material for leadframes of semiconductor devices.Type: GrantFiled: August 22, 1986Date of Patent: March 22, 1988Assignee: Hitachi Metals, Ltd.Inventors: Daiji Sakamoto, Rikizo Watanabe
-
Patent number: 4713576Abstract: A color picture tube includes a shadow mask of a precipitation strengthening Fe-Ni alloy. The alloy contains Fe-Ni as a major constituent and has at least one additive element. The alloy has a precipitation strengthening phase of Ni.sub.x X.sub.y (wherein X is at least one element selected from the group consisting of Al, Ti, Nb, Ta and Zr; x is 2 to 4; and y is 0.05 to 1.5) and an average thermal expansion coefficient of not more than 6.times.10.sup.-6 /.degree. C. in a temperature range of 20.degree. C. to 100.degree. C.Type: GrantFiled: April 15, 1986Date of Patent: December 15, 1987Assignees: Hitachi, Ltd., Hitachi Metals, Ltd.Inventors: Akira Misumi, Ryoji Hirai, Rikizo Watanabe
-
Patent number: 4612167Abstract: A copper-base alloy for leadframes comprising 0.8-4.0 weight % of Ni, 0.2-4.0 weight % of Ti, and balance Cu and inevitable impurities, the ratio of Ni to Ti being 1-4. It may also comprise 0.1-2.0 weight % of Zn. It may further comprise 0.01-2.0 weight % of at least one of Fe and Co and 0.005-0.5 weight % of at least one element selected from the group consisting of Al, Si, Mn and Mg. The copper-base alloy has good electric conductivity and high mechanical strength. It further has good solderability and solder durability.Type: GrantFiled: March 1, 1985Date of Patent: September 16, 1986Assignee: Hitachi Metals, Ltd.Inventors: Rikizo Watanabe, Daizi Sakamoto