Heating Step Follows Cold Working Patents (Class 148/651)
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Patent number: 6688148Abstract: A method of making high carbon content steel engine components is disclosed. The method includes pre-processing a supply wire of high strength steel having a spheroidized carbide microstructure and high-strength mechanical properties, applying a lubricant on the surface of the supply wire, and cold-forming the blank to substantially reduce or eliminate the need for any additional surface grinding operations.Type: GrantFiled: January 25, 2002Date of Patent: February 10, 2004Assignee: Defiance Precision Products, Inc.Inventors: Raymond C. Hartzell, Jeffrey A. Buck, Stanley Marchewka
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Publication number: 20040003868Abstract: A steel sheet for a tension mask excellent in the shielding properties from geomagnetism consists essentially of lower than 0.1% by weight of C, lower than 0.2% by weight of Si, 0.4 to 2% by weight of Mn, not higher than 0.1% by weight of P, not higher than 0.03% by weight of S, not higher than 0.01% by weight of sol. Al, 0.003 to 0.02% by weight of N and the balance of Fe, and has an anhysteretic magnetic permeability of 5,000 or higher.Type: ApplicationFiled: July 2, 2003Publication date: January 8, 2004Applicants: NKK CORPORAITON, SONY CORPORATIONInventors: Hideki Matsuoka, Yasushi Tanaka, Reiko Sugihara, Tatsuhiko Hiratani, Kenichiro Takayanagi, Masamichi Okada, Hiroaki Kato
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Patent number: 6673170Abstract: Aluminum-killed medium carbon steel sheets, and the steel sheet stock prepared from it, is useful for manufacturing containers for a variety of food and industrial purposes. High mechanical strength is imparted to steel sheeting when the sheeting is processed through a continuous series of operations including cold-rolling and annealing. Annealing at a temperature maintained above the pearlitic transformation (Ac1) and rapid cooling yields steel sheet of high maximum rupture strength. Improved mechanical properties allows the steel sheet to be used in the manufacture of thin wall containers or containers of novel shape.Type: GrantFiled: July 3, 2000Date of Patent: January 6, 2004Assignee: SollacInventor: Mohamed Bouzekri
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Patent number: 6673171Abstract: A method is provided for producing medium carbon steel sheet and strip with enhanced uniform elongation for deep drawing applications. In one embodiment, a steel slab containing carbon 0.30/0.70%, manganese 0.75/2.0%, silicon up to 1.0% max., total aluminum 0.020/0.10%, the balance iron and incidental impurities is hot rolled to strip at a finishing temperature within the range of 839° C. (1542° F.) to 773° C. (1424° F.) and spheroidize annealed at a temperature below the A1 temperature. In a second embodiment, a steel slab containing 0.40 minimum/0.70% maximum carbon, 0.50/1.50% manganese, up to 1.0% silicon, 0.020/0.10% total aluminum, the balance iron and incidental impurities is hot rolled, cold rolled and spheroidize annealed, with various combinations of manganese and silicon within the above ranges providing lower yield strength at levels of 60 ksi, 70 ksi, and 80 ksi with minimum 14% uniform elongation.Type: GrantFiled: August 16, 2002Date of Patent: January 6, 2004Assignee: United States Steel CorporationInventors: Craig O. Hlady, Todd M. Osman
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Patent number: 6660109Abstract: A powder metallurgical process of preparing a sheet from a powder having an intermetallic alloy composition such as an iron, nickel or titanium aluminide. The sheet can be manufactured into electrical resistance heating elements having improved room temperature ductility, electrical resistivity, cyclic fatigue resistance, high temperature oxidation resistance, low and high temperature strength, and/or resistance to high temperature sagging. The iron aluminide has an entirely ferritic microstructure which is free of austenite and can include, in weight %, 4 to 32% Al, and optional additions such as ≦1% Cr, ≧0.05% Zr ≦2% Ti, ≦2% Mo, ≦1% Ni, ≦0.75% C, ≦0.1% B, ≦1% submicron oxide particles and/or electrically insulating or electrically conductive covalent ceramic particles, ≦1% rare earth metal, and/or ≦3% Cu.Type: GrantFiled: October 31, 2001Date of Patent: December 9, 2003Assignee: Chrysalis Technologies IncorporatedInventors: Mohammad R. Hajaligol, Clive Scorey, Vinod K. Sikka, Seetharama C. Deevi, Grier Fleishhauer, A. Clifton Lilly, Jr., Randall M. German
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Patent number: 6645324Abstract: A ferritic stainless steel plate of excellent ridging resistance and formability, as well as a manufacturing method thereof are proposed. Specifically, the rolling is conducted at a rolling reduction of 30% or more in at least 1 pass and at a temperature difference between the center of the plate thickness and the surface of 200° C. or lower in a pass for the maximum rolling reduction to cause the area ratio of a {111} orientation colony to be present by 30% or more in the regions of ⅛ to ⅜ and ⅝ to ⅞ of the plate thickness. The {111} orientation colony is an assembly of adjacent crystals in which the angle of <111> orientation vector for each of the crystals relative to the direction vector vertical to the rolling surface is within 15°.Type: GrantFiled: March 21, 2002Date of Patent: November 11, 2003Assignee: Kawasaki Steel CorporationInventors: Norimasa Hirata, Takeshi Yokota, Yasushi Kato, Takumi Ujiro, Susumu Satoh
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Patent number: 6641931Abstract: The present invention aims to produce a cold rolled metal coated multi-phase steel, characterized by a tensile strength of at least 500 MPa, a yield ratio (Re/Rm) lower than 0.65 in skinned conditions, lower than 0.60 in unskinned conditions, and with good metal coating adhesion behavior. In the case of the aluminized steel according to the invention, the steel also has superior resistance to temperature corrosion up to 900° C. and excellent mechanical properties at this high temperature. The hot metal coated steel product having a steel composition with a manganese content lower than 1.5%, chrome content between 0.2 and 0.5%, molybdenum content between 0.1 and 0.25%, and a relation between the chrome and molybdenum content as follows Cr+2 Mo higher than or equal to 0.7%, undergoes a thermal treatment in the hot dip metal coating line defined by a soaking temperature between Ac1 and Ac3, a primary cooling speed higher than 25° C./sec and a secondary cooling speed higher than 4° C./sec.Type: GrantFiled: December 8, 2000Date of Patent: November 4, 2003Assignee: Sidmar N.V.Inventors: Serge Claessens, Dirk Vanderschueren
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Patent number: 6641682Abstract: An aperture grill material for a color picture tube having excellent tensile strength and high-temperature creep characteristics and magnetic characteristics superior to existing materials, a production method therefor, an aperture grill and a color picture tube. The aperture grill material for a color picture tube is characterized by being consisting of a low-carbon alloy steel sheet containing 0.05 to 2.5% by weight of Cu and 0.001 to 0.4% by weight of P, and containing 0.01 to 0.5% by weight of at least one of at least one of Cr and Mo. A production method for the aperture grill material for a color picture is characterized by comprising the steps of cold-rolling a low-carbon alloy hot-rolled steel strip containing 0.05 to 2.5% by weight of Cu, 0.001 to 0.4% by weight of P, and 0.01 to 0.5% by weight of at least one of Cr and Mo, and then precipitating the steel strip within a temperature range 300 to 800° C.Type: GrantFiled: April 15, 2002Date of Patent: November 4, 2003Assignee: Toyo Kohan Co., Ltd.Inventors: Tsuneyuki Ide, Takahiko Miyazaki, Susumu Shigemasa, Yasuo Tahara
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Patent number: 6641681Abstract: The invention concerns a steel material which consists of a steel having the following chemical composition in weigh-%: 1.0-1.9 C, 0.5-2.0 Si, 0.1-1.5 Mn, 4.0-5.5 Cr, 2.5-4.0 (Mo+W/2), however max 1.0 W, 2.0-4.5 (V+Nb/2), however max 1.0. Nb, balance iron and impurities in normal amounts in the form of residual elements from the manufacturing of the steel, and with a microstructure, which in the hardened and tempered condition of the steel contains 5-12 vol-% MC-carbides, at least about 80 vol-% of the carbides having a size which is larger than 3 &mgr;m but smaller than 25 &mgr;m preferably smaller than 20 &mgr;m, and, prior to tempering, 0.50-0.70 weight-% carbon, which is dissolved in the martensite in the hardened condition of the steel. The material is intended for cold work tools, in the first place for homogenous rolls for cold rolling of meta, strips.Type: GrantFiled: February 12, 2002Date of Patent: November 4, 2003Assignee: Uddeholm Tooling AktiebolagInventors: Odd Sandberg, Bo Rydell
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Publication number: 20030201039Abstract: A cold-rolled steel sheet having an ultrafine grain structure including a ferrite phase is provided. The cold-rolled steel sheet contains C, Si, Mn, Ni, Ti, Nb, Al, P, S, N and Fe and incidental impurities. The ferrite phase has a content of 65 percent by volume or more and an average grain size of 3.5 &mgr;m or less.Type: ApplicationFiled: March 18, 2003Publication date: October 30, 2003Applicant: Kawasaki Steel CorporationInventors: Tetsuo Mochida, Kazuhiro Seto, Kei Sakata, Tomohisa Oonishi
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Patent number: 6635127Abstract: Steel strapping and a method of manufacturing steel strapping are disclosed. The steel strapping has the following composition in wt % and a microstructure including a matrix of recovery-annealed cold worked ferrite containing martensite and carbides dispersed through the matrix. C: up to 0.2 Mn: up to 2.0 Si: 0.2-0.4 Ti: 0.025-0.045 V: 0.05-0.07 Cr: up to 0.25 Ni: up to 0.30 Mo: up to 0.10 N: up to 0.005 Cu: up to 0.20 Al: up to 0.08 Nb: up to 0.005 P: up to 0.035 S: up to 0.020 Balance iron and incidental impurities.Type: GrantFiled: August 2, 2001Date of Patent: October 21, 2003Assignee: Illinois Tool Works Inc.Inventors: Jeffery W Doonan, Peter Ivan Unicomb, Robert K Armstrong
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Publication number: 20030188811Abstract: The present invention presents a high tensile strength cold rolled steel sheet having excellent formability, impact resistance and strain age hardening characteristics, and the production thereof. As a specific means, a slab having a composition which contains, by mass %, 0.15% or less of C, 0.02% or less of Al, and 0.0050 to 0.0250% of N at N/Al of 0.3 or higher, and has N in a solid solution state at 0.0010% or more, is first hot rolled at the finish rolling delivery-side temperature of 800° C. or above, and is subsequently coiled at the coiling temperature of 750° C. or below to prepare a hot rolled plate. Then, after cold rolling, the hot rolled plate is continuously cooled at a temperature from the recrystallization temperature to 900° C. at a holding time of 10 to 120 seconds, and is cooled by primary cooling in which the hot rolled plate is cooled to 500° C. or below at a cooling rate of 10 to 300° C.Type: ApplicationFiled: January 13, 2003Publication date: October 9, 2003Applicant: Kawasaki Steel CorporationInventors: Chikara Kami, Akio Tosaka, Kazunori Osawa, Shinjiro Kaneko, Takuya Yamazaki, Kaneharu Okuda, Takashi Ishikawa
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Publication number: 20030164211Abstract: Strip made of an austenitic Fe—Ni alloy or Fe—Ni—Co alloy or Fe—Ni—Co—Cu alloy, the chemical composition of the alloy of which comprises, in % by weight: 30%≦Ni≦70%; 0%≦Cu+2×Co≦20%; 0%≦Mn+Cr<5%; 0%≦W+2×Mo≦2%; 0%≦Ti+V+Nb+Al≦1%; 0.0005%≦B≦0.007%; the balance being iron and impurities such as C, S, P, O and N; the chemical composition being such that Fe+Ni+Cu+Co≧95%. The alloy has a cubic texture with a cubic texture index Dc≧7. Process for manufacturing a strip. Process for manufacturing a part by mechanical cutting.Type: ApplicationFiled: April 7, 2003Publication date: September 4, 2003Inventors: Lucien Coutu, Vincent Durieux, Jerome Giusti
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Patent number: 6613166Abstract: The proposed brake disk consists of steel of a composition of 0.1 to 0.4% of carbon, up to 1.0% of silicon, up to 2.0% of manganese, up to 0.02% of sulfur, 11 to 16% of chromium, up to 1.0% of nickel and 0.5 to 1.5% of molybdenum, the remainder being iron and production-related impurities.Type: GrantFiled: February 28, 2001Date of Patent: September 2, 2003Assignee: Edelstahl Werke Buderus AGInventor: Walter Grimm
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Patent number: 6605166Abstract: A high-strength bolt having excellent delayed fracture resistance and stress relaxation resistance in addition to a tensile strength of 1200 N/mm2 or higher is disclosed. A steel material for the high-strength bolt includes C: 0.50 to 1.0% by mass (hereinafter, referred to simply as “%”), Si: 0.5% or less (not including 0%), Mn: 0.2 to 1%, P: 0.03% or less (including 0%) and S: 0.03% or less (including 0%). The steel material has pro-eutectoid ferrite, pro-eutectoid cementite, bainite and martensite structures at less than 20% in total and a pearlite structure as the remainder. The high-strength bolt is produced by drawing the steel material severely to obtain a steel wire, forming the steel wire into a bolt shape through a cold heading, and subjecting the shaped steel wire to a blueing treatment at a temperature within a range of 100 to 400° C.Type: GrantFiled: December 6, 2001Date of Patent: August 12, 2003Assignees: Kabushiki Kaisha Kobe Seiko Sho, Honda Motor Co., Ltd., Saga Tekkohsho Co., Ltd.Inventors: Seiichi Koike, Mitsuo Takashima, Katsuhiro Tsukiyama, Yuichi Namimura, Nobuhiko Ibaraki
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Publication number: 20030145920Abstract: The present invention presents a high tensile strength cold rolled steel sheet having excellent formability, impact resistance and strain age hardening characteristics, and the production thereof. As a specific means, a slab having a composition which contains, by mass %, 0.15% or less of C, 0.02% or less of Al, and 0.0050 to 0.0250% of N at N/Al of 0.3 or higher, and has N in a solid solution state at 0.0010% or more, is first hot rolled at the finish rolling delivery-side temperature of 800° C. or above, and is subsequently coiled at the coiling temperature of 750° C. or below to prepare a hot rolled plate. Then, after cold rolling, the hot rolled plate is continuously cooled at a temperature from the recrystallization temperature to 900° C. at a holding time of 10 to 120 seconds, and is cooled by primary cooling in which the hot rolled plate is cooled to 500° C. or below at a cooling rate of 10 to 300° C.Type: ApplicationFiled: January 13, 2003Publication date: August 7, 2003Applicant: Kawasaki Steel CorporationInventors: Chikara Kami, Akio Tosaka, Kazunori Osawa, Shinjiro Kaneko, Takuya Yamazaki, Kaneharu Okuda, Takashi Ishikawa
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Patent number: 6596101Abstract: Preferred embodiments of the invention provide new nanostructured materials and methods for preparing nanostructured materials having increased tensile strength and ductility, increased hardness, and very fine grain sizes making such materials useful for a variety of applications such as rotors, electric generators, magnetic bearings, aerospace and many other structural and nonstructural applications. The preferred nanostructured materials have a tensile yield strength from at least about 1.9 to about 2.3 GPa and a tensile ductility from at least 1%. Preferred embodiments of the invention also provide a method of making a nanostructured material comprising melting a metallic material, solidifying the material, deforming the material, forming a plurality of dislocation cell structures, annealing the deformed material at a temperature from about 0.30 to about 0.70 of its absolute melting temperature, and cooling the material.Type: GrantFiled: October 3, 2001Date of Patent: July 22, 2003Assignee: Johns Hopkins UniversityInventors: Timothy P. Weihs, Robert Cammarata, Chia-Ling Chien, Changhe Shang
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Publication number: 20030129444Abstract: The invention proposes a high-strength dual-phase cold rolled steel sheet having an excellent deep drawability, wherein the steel sheet has a composition comprising C: 0.01-0.08 mass %, Si: not more than 2.0 mass %, Mn: not more than 3.0 mass %, P: not more than 0.10 mass %, S: not more than 0.02 mass %, A1: 0.005-0.20 mass %, N: not more than 0.02 mass % and V: 0.01-0.5 mass %, provided that V and C satisfy a relationship of 0.5×C/12≦V/51≦3×C/12, and the remainder being Fe and inevitable impurities, and has a microstructure consisting of a ferrite phase as a primary phase and a secondary phase including martensite phase at an area ratio of not less than 1% to a whole of the microstructure and a high-strength dual-phase galvanized steel sheet comprising a galvanized coating on the above steel sheet as well as a method of producing the same.Type: ApplicationFiled: July 23, 2002Publication date: July 10, 2003Inventors: Saiji Matsuoka, Kazuhiro Hanazawa, Tetsuo Shimizu, Kei Sakata
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Patent number: 6554925Abstract: The method for manufacturing cold-rolled steel sheet comprises the steps of: rough-rolling a slab using a rough-rolling unit; finish-rolling the sheet bar using a continuous hot finishing-rolling mill; cooling the hot-rolled steel strip on a runout table; coiling thus cooled hot-rolled steel strip; and applying picking, cold-rolling the hot-rolled steel strip, and final annealing to the cold-rolled steel strip.Type: GrantFiled: March 29, 2001Date of Patent: April 29, 2003Assignee: NKK CorporationInventors: Tadashi Inoue, Yasuhide Ishiguro, Yoichi Motoyashiki, Sadanori Imada, Toru Inazumi
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Patent number: 6537398Abstract: A strip of stainless steel, which is cast and/or hot rolled and which is dark colored by oxides on the surface of the strip, remaining from the foregoing manufacture of said cast and/or hot rolled strips, is cold rolled in one or more cold rolling passes (11-13) following after each other, so that the thickness of the strip is reduced by 10-75% and so that the oxide scales crackle, i.e. so that fissures are established in the oxide layers. Thereafter, the strip is annealed in a furnace (18) having a furnace atmosphere obtainable by heating the furnace by means of burners which consume a liquid or gaseous fuel, which is combusted by means of a gas which contains at least 85 vol-% oxygen and not more than 10 vol-% nitrogen, wherein a furnace atmosphere is created, in which the strip can be annealed without oxidising the metal surfaces which are exposed through the crackling, in a way which would make the subsequent descaling and pickling difficult.Type: GrantFiled: July 10, 2001Date of Patent: March 25, 2003Assignee: AvestaPolarit AB (publ)Inventor: Sten Ljungars
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Publication number: 20030047257Abstract: The present invention provides a cold-rolled sheet exhibiting superior strain-aging hardenability which is suitable for use in automobile bodies, and a method for manufacturing the same. In particular, a slab including, by mass, not more than 0.15% carbon, not more than 0.02% Al, and 0.0050% to 0.0250% nitrogen in which Si+Mn/5+10P is adjusted to less than 0.44 and the ratio N/Al is adjusted to not less than 0.3 is hot-rolled at a finish-rolling delivery temperature FDT of not less than 800° C., and then coiled at a temperature of not more than 650° C. Next, after cold-rolling, continuous-annealing at a temperature between the recrystallization temperature and 950° C., primary cooling for cooling to a temperature zone of not more than 500° C., and overaging in the temperature zone of 350° C. to 450° C. for a retention time of not more than 30 seconds are performed to prepare a steel sheet containing not less than 0.Type: ApplicationFiled: January 23, 2002Publication date: March 13, 2003Inventors: Chikara Kami, Akio Tosaka
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Patent number: 6531039Abstract: An anode for use in electroplating semiconductor wafers, comprising a metal plate formed from a generally continuous casting process that is essentially free of voids or cracks, the casting being thermo-mechanically worked until the anode has an average grain size of less than 100 &mgr;m.Type: GrantFiled: February 21, 2001Date of Patent: March 11, 2003Assignee: Nikko Materials USA, Inc.Inventor: Stephen J. Kohut
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Patent number: 6524726Abstract: Disclosed is a cold-rolled steel sheet excellent in formability, panel shapeability and dent-resistance, comprising 0.005 to 0.015% by weight of C, 0.01 to 0.2% by weight of Si, 0.2 to 1.5% by weight of Mn, 0.01 to 0.07% by weight of P, 0.006 to 0.015% by weight of S, 0.01 to 0.08% by weight of sol. Al, not higher than 0.004% by weight of N (N≦0.004%), not higher than 0.003% by weight of O (O≦0.003%), 0.04 to 0.23% by weight of Nb, 1.0≦(Nb %×12)/(C %×93)≦3.0, and a balance of Fe and unavoidable impurities, said cold-rolled steel sheet meeting the relationship given below: exp(&egr;)×(5.29×exp(&egr;)−4.19)≦&sgr;/&sgr;0.2≦exp(&egr;)×(5.64×exp(&egr;)−4.49) where 0.002<&egr;≧0.096, &egr; represents a true strain, &sgr;0.2 represents a 0.2% proof stress, and &sgr; represents a true stress relative to &egr;.Type: GrantFiled: December 23, 1999Date of Patent: February 25, 2003Assignee: NKK CorporationInventors: Fusato Kitano, Masaya Morita, Yoshihiro Hosoya, Takeshi Fujita, Tadashi Inoue, Masahiro Iwabuchi, Takeo Ishii
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Publication number: 20030034100Abstract: Steel strapping and a method of manufacturing steel strapping are disclosed. The steel strapping has the following composition in wt % and a microstructure including a matrix of recovery-annealed cold worked ferrite containing martensite and carbides dispersed through the matrix. 1 C: up to 0.2 Mn: up to 2.0 Si: 0.2-0.4 Ti: 0.025-0.045 V: 0.05-0.07 Cr: up to 0.25 Ni: up to 0.30 Mo: up to 0.10 N: up to 0.005 Cu: up to 0.20 Al: up to 0.08 Nb: up to 0.005 P: up to 0.035 S: up to 0.020 Balance iron and incidental impurities.Type: ApplicationFiled: August 2, 2001Publication date: February 20, 2003Inventors: Jeffery W. Doonan, Peter Ivan Unicomb, Robert K. Armstrong
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Patent number: 6517955Abstract: The invention relates to a high strength hot-dip galvanized and galvannealed steel sheets with excellent drawability for press forming and excellent plating adhesion that is useful as a member for automobiles, construction, electric devices and the like, and to a process for its manufacture. According to an embodiment of the invention, the steel sheet contains in terms of weight percent, C: 0.05-0.2%, Si: 0.2-2.0%, Mn: 0.2-2.5%, Al: 0.01-1.5%, Ni: 0.2-5.0%, P: <0.03% and S: <0.02%, the relationship between Si and Al being such that 0.4(%)≦Si+0.8 Al(%)≦2.0% and the remainder consisting of Fe and unavoidable impurities, the volume percentage of the retained austenite is 2-20% and the steel sheet surface wherein the relationship between the Ni and Si, Al in 0.5 &mgr;m of the steel sheet surface layer is such that Ni(%)≦¼ Si+⅓Al(%), has a Zn plating layer comprising Al: ≦1% with the remainder Zn and unavoidable impurities.Type: GrantFiled: December 29, 2000Date of Patent: February 11, 2003Assignee: Nippon Steel CorporationInventors: Yoshihisa Takada, Masayoshi Suehiro
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Patent number: 6508892Abstract: A shadow mask blank of Fe—Ni alloy which exhibits excellent uniformity of diameter of apertures formed by perforation with etching for the passage of electron beams, consisting of 34-38% Ni, 0.05-0.5% Mn, 4-20 ppm S, and the balance Fe and no more than specified limits of C, Si, Al, and P, with MnS inclusions 50-1,000 nm in diameter dispersed at the density of at least 1,500/mm2 or simply with etched holes 0.5-10 &mgr;m in diameter emerging at the density of at least 2,000/mm2 when the blank is immersed in a 3% nitric acid-ethyl alcohol solution at 20° C. for 30 seconds. A method of manufacturing the blank comprises hot rolling of a slab of the Fe—Ni alloy, cooling, recrystallization annealing, cold rolling, etc. under controlled conditions: e.g., hot rolling the slab at 950-1,250° C. to 2-6 mm thick, cooling the stock in the range of 900-700° C. at the rate of 0.5° C./second, continuously passing the stock through a heating furnace at 850-1,100° C.Type: GrantFiled: April 12, 2001Date of Patent: January 21, 2003Assignee: Nippon Mining & Metals Co., Ltd.Inventors: Takaaki Hatano, Yoshihisa Kita
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Patent number: 6488791Abstract: A conventional steel C-channel used as a side rail in a truck frame is strengthened by forming, after heat treating, strengthening lips on the edges of the C-channel flanges while the C-channel is still hot from the final tempering step of the heat treating process. The method obviates the need to use more expensive quenching dies and is advantageously performed immediately after tempering.Type: GrantFiled: July 3, 2001Date of Patent: December 3, 2002Assignee: Metalsa Roanoke Inc.Inventor: Buren K. Powers, II
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Patent number: 6440237Abstract: A process for forming a roller bearing comprising the steps of providing a cylindrical slug that comprises at least 0.7 weight percent carbon and up to 1.6 weight percent of at least one alloying element. The slug has lateral and side surfaces. A centered indentation is formed in each side surface. A circular chamfer surface is formed at the intersection of each side and each lateral surface, thereby producing an upsetting slug. The upsetting slug is cold formed, thereby deepening the centered indentations and forming a blank. The blank has a web separating the deepened indentations and end surfaces and chamfer surfaces that are substantially at net shape for the roller bearing. The web is removed from the blank, thereby forming a pierced blank having a through hole with an inner surface. The inner and lateral surfaces of the pierced blank are finished to the specified inner and outer diameters for the roller bearing.Type: GrantFiled: May 23, 2000Date of Patent: August 27, 2002Assignee: Delphi Technologies, Inc.Inventors: Michael J. Skilling, William Paul Vukovich
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Patent number: 6440584Abstract: A hot-dip galvanized steel sheet is produced by rough rolling a steel, finish rolling the rough rolled steel at a temperature of Ar3 point or more, coiling the finish rolled steel at a temperature of 700° C. or less, and hot-dip galvanizing the coiled steel at a pre-plating heating temperature of Ac1 to Ac3. A continuous hot-dip galvanizing operation is performed by soaking a pickled strip at a temperature of 750 to 850° C., cooling the soaked strip to a temperature range of 600° C. or less at a cooling rate of 1 to 50° C. per second, hot-dip galvanizing the cooled strip, and cooling the galvanized strip so that the residence time at 400 to 600° C. is within 200 seconds. The steel sheet has a structure consisting essentially of ferrite and martensite.Type: GrantFiled: September 17, 2001Date of Patent: August 27, 2002Assignee: NKK CorporationInventors: Yasunobu Nagataki, Toshiaki Urabe, Fusato Kitano, Akio Kobayashi, Kunikazu Tomita, Shunsaku Node, Kozo Harada, Shogo Sato, Toru Inazumi
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Patent number: 6398887Abstract: The object of the invention is an aluminum-killed low-carbon steel sheet comprising by weight between 0.022 and 0.035% of carbon, between 0.15 and 0.25% of manganese, between 0.040 and 0.070% of aluminum, between 0.004 and 0.006% of nitrogen, the remainder being iron and the inevitable trace impurities. The steel contains carbon in free state, a grain count per mm2 greater than 20000 and, in the aged condition, has a percentage elongation A% satisfying the relationship: (670−Rm)/14≦A%≦(720−Rm)/17 where Rm is the maximum rupture strength.Type: GrantFiled: June 30, 2000Date of Patent: June 4, 2002Assignee: SollacInventor: Mohamed Bouzekri
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Patent number: 6398884Abstract: This invention can form a sufficiently internal oxide layer in a surface layer portion of an iron matrix of a steel sheet by hot rolling a base steel and subjecting to a heat treatment at a temperature range of 650-950° C. in an atmosphere substantially not causing reduction while being adhered with a black skin scale irrespectively of a chemical steel composition or production history, or even when a radiation type heating of a radial tube or the like is used in a recrystallization annealing before a hot dipping treatment, and hence excellent hot-dipping property and conversion treating property can be given to a steel sheet for hot dipping.Type: GrantFiled: October 19, 2000Date of Patent: June 4, 2002Assignee: Kawasaki Steel CorporationInventors: Kazuaki Kyono, Shigeru Umino, Akio Tosaka, Keiji Nishimura, Hiromasa Hayashi
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Patent number: 6395108Abstract: A flat product made of multiphase steel and a method for preparing the steel includes hot rolling at a temperature at which the austenite phase is stable, then tempering to form a C and Mn-enriched phase in a matrix, followed by a heat treatment to form austenite islands and/or enriching in Mn the already formed austenite and cooling down to room temperature so as to obtain a final product with a ferrite matrix containing residual austenite, bainite and/or martensite islands.Type: GrantFiled: April 30, 2001Date of Patent: May 28, 2002Assignee: Recherche et Developpement du Groupe Cockerill SambreInventors: Klaus Eberle, Philippe Harlet, Pierre Cantinieaux
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Patent number: 6361624Abstract: A method of producing a fully stabilized extra low carbon porcelain enameling steel having excellent formability and fish scaling resistance as well as superior enamel adherence. The method includes hot rolling a slab to strip, the slab having a composition consisting essentially of in weight percent: 0.005 max. C, 0.35 max. Mn, 0.015 max. P, 0.015 max. S, 0.015 max. Si, 0.025 to 0.055 Al, 0.006 to 0.015 N, 0.03 to 0.06 Ti, 0.02 to 0.05 Cb, up to 0.03 Sb, the balance Fe and inevitable impurities. The hot rolled strip is cold rolled at least 65% and box annealed until a cold spot temperature within the range of 610 to 705 degrees C. is reached. The invention includes the product made according to the process.Type: GrantFiled: September 11, 2000Date of Patent: March 26, 2002Assignee: USX CorporationInventor: George Franklin Altemus
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Patent number: 6355364Abstract: Processes for preparing copper-INVAR-copper (CIC) for use in making chip packaging and the CIC created. One process comprises annealing a CIC section at a temperature in a range of 1475° F. to 1625° F. for a time in a range of 40 to 120 seconds. Another process includes heat treating a CIC section at a temperature in a range of 1275° F. to 1425° F. for a time in a range of 40 to 120 seconds. The above processes can be combined. The CIC section created exhibits unique electrical, physical, and mechanical properties.Type: GrantFiled: June 29, 1999Date of Patent: March 12, 2002Assignee: International Business Machines CorporationInventors: Robert M. Japp, Lisa J. Jimarez, Bonnie S. McClure
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Patent number: 6338762Abstract: An austenitic stainless steel for use in engine gaskets having a high fatigue strength and resistance to settlement and method of manufacture thereof. The austenitic stainless steel is prepared by cold rolling at least 40%, annealing at a temperature of 700° C. to 900° C. followed by temper rolling with a reduction of at least 40%. The metal structure obtained by annealing is a recovered unrecrystallized structure or a mixed structure of a recovered unrecrystallized structure and a recrystallized structure. The austenitic stainless steel includes at most 0.03% C, at most 1.0% Si, at most 2.0% Mn, 16.0% to 18.0% Cr, 6.0% to 8.0% Ni and up to 0.20% N.Type: GrantFiled: May 3, 2000Date of Patent: January 15, 2002Assignee: Sumitomo Metal Industries, Ltd.Inventors: Naoto Sato, Kazuhiko Adachi, Kenichi Goshokubo, Takashi Katsurai, Shigeki Muroga
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Patent number: 6329081Abstract: There is provided a stainless steel sheet material, used for a semiconductor manufacturing device, to which it difficult for fine dust to be attached and from the surface of which the attaching dust can be easily washed away. Also, there is provided a method of manufacturing the stainless steel sheet material. A stainless steel sheet material characterized in that: the number of pinholes, the area of each pinhole exceeding 0.25 mm2, in the area of 10 cm2 on the surface of a skinpass-rolled stainless steel sheet material is not more than 10; and the average surface roughness Ra on the center line in the direction perpendicular to the rolling direction is not more than 0.15 &mgr;m. A method of manufacturing a stainless steel sheet material comprising the steps of: annealing a stainless steel cold-rolled sheet in a heat-treatment furnace having no support rollers in a temperature region exceeding 600° C.Type: GrantFiled: May 17, 2000Date of Patent: December 11, 2001Assignee: Nippon Steel CorporationInventors: Fumio Fudanoki, Toshihiko Sugimoto, Satoshi Akamatsu, Masanori Hashimoto
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Patent number: 6306229Abstract: An invar alloy steel sheet for shadow masks is provided which has improved etchability, an economical production method, a shadow mask made of the invar alloy steel sheet, and a color picture tube which incorporates the shadow mask. The invar alloy steel sheet is produced by hot working an alloy slab consisting of 33 top 40 wt % nickel with the balance being iron, and then subjecting the slab to a primary cold rolling at a rolling reduction ratio of not more than 80%, annealing at a temperature of at least 550° C., and subjecting the slab to a secondary cold rolling at a rolling reduction ratio of not more than 50%. The invar alloy steel sheet has a percentage of {100} texture of 60 to 80%.Type: GrantFiled: February 23, 2000Date of Patent: October 23, 2001Assignee: Toyo Kohan Co., Ltd.Inventors: Tsuneyuki Ide, Hironao Okayama, Hiroaki Ikenaga, Susumu Shigemasa, Yasuo Tahara, Taizo Sato, Akira Ikeda
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Patent number: 6290788Abstract: A process for producing precision steel tubes includes cold forming tube blanks, in particular in a plurality of forming steps, with or without an internal tool. In this process, a tube blank made from interstitial free IF steel is used as the starting material.Type: GrantFiled: February 8, 1999Date of Patent: September 18, 2001Assignee: Mannesmann AGInventors: Ronald Claus, Jürgen Wiete, Rüdiger Hahn, Stefan Meimeth
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Patent number: 6221179Abstract: A hot rolled steel sheet with improved formability and producing method therefor, which can be easily produced with general hot strip mills, having less anisotropy of mechanical properties and final ferrite grain diameter of less than 2 &mgr;m that could not be achieved by the prior art. The hot rolled steel sheet comprises a ferrite phase as a primary phase, and has an average ferrite grain diameter of less than 2 &mgr;m, with the ferrite grains having an aspect ratio of less than 1.5. The hot rolled steel sheet is obtained by carried out a reduction process under a dynamic recrystallization conditions through reduction passes of not less than 5 stands in the hot finish rolling.Type: GrantFiled: June 22, 1999Date of Patent: April 24, 2001Assignee: Kawasaki Steel CorporationInventors: Eiko Yasuhara, Masahiko Morita, Osamu Furukimi, Susumu Okada
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Patent number: 6221180Abstract: The invention provides a can steel sheet having satisfactory surface appearance and having workability, appearance property after working and high yield that can meet demands on complicated can forming, and a manufacturing process thereof. To be more specific, according to the invention, a slab having a composition containing, in weight %, C: more than 0.005% and equal to or less than 0.1%, Mn: 0.05-1.0% is subjected to hot-rolling at a finishing temperature of 800 to 1000° C., to coiling at 500 to 750° C., to cold-rolling, followed by continuous annealing at a recrystallization temperature or higher and 800° C. or lower, and then to box annealing at a temperature higher than 500° C. and equal to or lower than 600° C. for 1 hr or longer. The steel sheet has preferably a structure containing ferrite as a principle phase and having a mean grain diameter of 10 &mgr;m or less and further containing 0.1-1% by weight of pearlite grains each having a grain diameter of 0.5-3 &mgr;m.Type: GrantFiled: December 7, 1999Date of Patent: April 24, 2001Assignee: Kawasaki Steel CorporationInventors: Akio Tosaka, Masatoshi Aratani, Osamu Furukimi, Hideo Kuguminato, Makoto Aratani, Yuji Miki
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Patent number: 6217680Abstract: A steel slab having a composition that comprises at most 0.008% by weight of C, at most 0.5% by weight of Si, at most 1.0% by weight of Mn, at most 0.15% by weight of P, at most 0.02% by weight of S, from 0.01 to 0.10% by weight of Al, at most 0.008% by weight of N, from 0.035 to 0.20% by weight of Ti, and from 0.001 to 0.015% by weight of Nb, with a balance of Fe and inevitable impurities, in which those C, S, N, Ti and Nb satisfy the following condition: 1.2(C/12+N/14+S/32)<(Ti/48+Nb/93), is subjected to rough hot-rolling to a reduction ratio of not lower than 85%, at a temperature falling between the Ar3 transformation point of the steel and 950° C., then to finishing hot-rolling to a reduction ratio of not lower than 65%, at a temperature falling between. 600° C. and the Ar3 transformation point of the steel, while being lubricated, to thereby have a mean shear strain of not larger than 0.06, then pickled, pre-annealed at a temperature falling between 700 and 920° C.Type: GrantFiled: March 15, 1999Date of Patent: April 17, 2001Assignee: Kawasaki Steel CorporationInventors: Yoshikazu Kawabata, Kaneharu Okuda, Kei Sakata, Takashi Obara, Atsushi Ogino
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Patent number: 6193819Abstract: A method for manufacturing a cold rolled steel sheet for use in a shadow mask is disclosed, in which without adding an expensive alloy element, a short intermediate decarburization annealing is carried out, and despite this fact, a forming defect does not occur after the forthcoming stacked annealing. The method includes the steps of preparing a steel composed of, in weight %, 0.003% or less of C, 0.10-0.20% of Mn, 0.01-0.05% of Al, 0.004% or less of N, and a balance of Fe and other unavoidable impurities. A hot rolling is carried out on the steel at a temperature of above 910° C., and then, a first cold rolling is carried out to form a first cold rolled steel sheet. Then a decarburization is carried out on the first cold rolled steel sheet down to a carbon content of 0.0015% to form a decarburized steel sheet, and then a second cold rolling with a reduction ratio of more than 35% is carried out on the decarburized steel sheet.Type: GrantFiled: December 16, 1999Date of Patent: February 27, 2001Assignee: Pohang Iron & Steel Co., Ltd.Inventors: Gyosung Kim, Hyun-Gyu Hwang, Eel-Young Kim, Joung-Hoon Cheoi, Jong-Ho Kim, Young-Mo Kim, Ohjoon Kwon, Ki-Ho Kim
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Patent number: 6162308Abstract: A method for producing a cold-rolled steel sheet or strip with good formability, especially stretch formability, for making pressings with a high buckling resistance from a steel comprising (in % by mass): 0.01 to 0.08% C, 0.10 to 0.80% Mn, maximum 0.15% Si, 0.015 to 0.08% Al, a maximum 0.005% N, 0.01 to 0.04% Ti and/or Nb, whose contents exceeding the quantity necessary for stoichiometric binding of the nitrogen, ranges from 0.003 to 0.015% Ti or 0.0015 to 0.008% Nb, and a maximum 0.15% in total of one or several elements from the group copper, vanadium, nickel, the remainder being iron, including unavoidable impurities, including a maximum 0.08% P and a maximum 0.02% S, comprises preheating the cast slab to a temperature exceeding 1050.degree. C., hot-rolling at a final temperature ranging from over the Ar.sub.3 temperature to 950.degree. C., coiling the hot-rolled strip at a temperature ranging from 550 to 750.degree. C.Type: GrantFiled: October 27, 1998Date of Patent: December 19, 2000Assignee: Thyssen Stahl AGInventors: Ilse Heckelmann, Ullrich Heidtmann, Rolf Bode
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Patent number: 6156131Abstract: A process for producing a strip of steel sheet, for the production of metal packaging, comprising forming a hot-rolled strip of steel having the following composition by weight: carbon up to 0.08%, silicon .ltoreq.0.020%, manganese between 0.05% and 0.60%, sulphur .ltoreq.0.020%, phosphorus .ltoreq.0.020%, nitrogen up to 0.016%, aluminum up to 0.060%, copper .ltoreq.0.06%, nickel .ltoreq.0.040%, and, optionally, chromium and boron, the balance consisting of iron and inevitable impurities, then carrying out a first cold-rolling operation on the hot-rolled strip in order to obtain a blank, subjecting the blank to a continuous recrystallization annealing operation, carrying out a second cold-rolling operation on the blank in at least two passes in order to obtain the sheet with its final thickness, wherein between the two passes of the second cold rolling, the strip of sheet is subjected to an ageing operation at a temperature of at most 300.degree. C.Type: GrantFiled: October 5, 1998Date of Patent: December 5, 2000Assignee: SollacInventors: Veronique Sardoy, Jean Claude Jouvenel, Jacques Ouvrard
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Patent number: 6117253Abstract: The present invention is related to the cold rolled steel sheet for making a shadow mask of a cathode ray tube of a color Braun tube for selecting colors and a manufacturing method therefor. Objects of the present invention are to enable production of a cold rolled steel sheet by one-step cold rolling and low-temperature annealing rather than by the conventional two-step cold rolling and decarburization annealing, and to provide a cold rolled steel sheet for a shadow mask and the manufacturing method therefor having better etchability and formability which are required for the material for a shadow mask than those of the conventional cold rolled steel sheets. The manufacturing method of the cold rolled steel sheet of the present invention is comprised of the steps of homogenizing the aluminum killed steel, which is composed in weight % of less than 0.002% of C, 0.20-0.45% of Mn, 0.015-0.020% of S, less than 0.02% of P, less than 0.01% of Si, 0.01-0.03% of Cr, 0.01-0.02% of Al, 0.0010-0.Type: GrantFiled: December 18, 1998Date of Patent: September 12, 2000Assignee: Pohang Iron & Steel Co., Ltd.Inventors: Ki Soo Kim, Hyun Gyu Hwang, Eel Young Kim, Chin Kwan Chang, Oh Joon Kwon
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Patent number: 6103394Abstract: A thin steel sheet having excellent rectangular drawability is produced by completing roughing rolling of steel containing C: 0.02 wt % or less, Si: 0.5 wt % or less, Mn: 1.0 wt % or less, P: 0.15 wt % or less, S: 0.02 wt % or less, Al: 0.01 to 0.10 wt %, N: 0.008 wt % or less, at least one of Ti: 0.001 to 0.20 wt % and Nb: 0.001 to 0.15 wt %, the balance comprising Fe, and inevitable impurities, in the temperature region of 950.degree. C. to the Ar.sub.3 transformation temperature: performing finish rolling at a reduction of over 70% under lubrication in the temperature region of the Ar.sub.3 transformation temperature to 500.degree. C.; pickling the sheet; annealing the resultant hot rolled sheet under conditions which satisfy the equations (1) and (2) below:(T+273) (20+log t).gtoreq.2.50.times.10.sup.4 (1)745.ltoreq.T.ltoreq.920 (2)wherein T: hot rolled sheet annealing temperature (.degree. C.Type: GrantFiled: March 3, 1998Date of Patent: August 15, 2000Assignee: Kawasaki Steel CorporationInventors: Kaneharu Okuda, Yoshikazu Kawabata, Kei Sakata, Takaaki Hira, Atsushi Ogino, Takashi Obara
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Patent number: 6099669Abstract: Composition segregation which results in streaks in an Fe--Ni alloy sheet shadow-mask is prevented by the following conditions. Heat-treatment from 1150.degree. C. to a temperature lower than the melting point for longer than 1 hour and not longer than 30 hours. Subsequent rough-rolling or forging at a reduction of area of 40% or more. A slab is subjected to removal of oxide scale on its surface and then heated in hydrogen atmosphere having dew point of 10.degree. C. or lower at a temperature of not less than 1100.degree. C. and lower than the melting point for time (t - hour) which is defined by:t.gtoreq.[3.8.times.10.sup.-7 exp (23830/T)]/R,where R is reduction area (%) at the slab production.Type: GrantFiled: March 7, 1997Date of Patent: August 8, 2000Assignee: Nippon Mining & Metals Co., Ltd.Inventors: Norio Yuki, Toshiyuki Ono, Tetsuo Kawahara
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Patent number: 6056832Abstract: Process for producing a sheet or strip for making a can obtained by drawing and ironing from a steel having the following composition in percentage by weight: Carbon less than 0.008%, Manganese between 0.10 and 0.30%, Nitrogen less than 0.006%, Aluminium between 0.01 and 0.06%, Phosphorus less than 0.015%, Sulphur less than 0.020%, Silicon less than 0.020%, a maximum of 0.08% of one or more elements selected from copper, nickel and chromium, the remainder being iron and residual impurities, in which process the slab is hot rolled into a hot sheet or strip having a thickness less than 3 mm, and then the hot sheet or strip is cold rolled with a reduction of between 83 and 92% and subjected to a recrystallization annealing and cold rerolled with a reduction of between 10 and 40%.Type: GrantFiled: October 3, 1997Date of Patent: May 2, 2000Assignee: SollacInventors: Michel Lespagnol, Jean-Francois Renard, P. Seurin
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Patent number: 6042952Abstract: A steel slab is rough-rolled into a sheet bar and butt-joined onto a preceding sheet bar and a widthwise end portion of the sheet bar is heated by means of an edge heater and then subjected to a continuous finish rolling through pair-cross rolls rolling on at least 3 stands to provide a hot rolled steel strip having a width of not less than 950 mm, a thickness of 0.5-2 mm and a crown within .+-.40 .mu.m, and the hot rolled steel strip is subjected to cold rolling, continuous annealing, temper rolling and, if necessary, plating treatment on the surface of the cold rolled steel strip, whereby there is obtained a steel sheet having an average thickness of not more than 0.20 mm and a width of not less than 950 mm, a thickness variation quantity in a widthwise direction is within .+-.4% of the average thickness in a region corresponding to not less than 95% of the width of the steel sheet as cold rolled and a hardness (HR30T) variation in the widthwise direction is within .+-.3 of an average hardness.Type: GrantFiled: November 12, 1997Date of Patent: March 28, 2000Assignee: Kawasaki Steel CorporationInventors: Makoto Aratani, Naotoshi Ryu, Hideo Kuguminato, Akio Tosaka, Kaneharu Okuda, Masatoshi Aratani, Susumu Okada
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Patent number: 6030472Abstract: A powder metallurgical process of preparing a sheet from a powder having an intermetallic alloy composition such as an iron, nickel or titanium aluminide. The sheet can be manufactured into electrical resistance heating elements having improved room temperature ductility, electrical resistivity, cyclic fatigue resistance, high temperature oxidation resistance, low and high temperature strength, and/or resistance to high temperature sagging. The iron aluminide has an entirely ferritic microstructure which is free of austenite and can include, in weight %, 4 to 32% Al, and optional additions such as .ltoreq.1% Cr, .gtoreq.0.05% Zr.ltoreq.2% Ti, .ltoreq.2% Mo, .ltoreq.1% Ni, .ltoreq.0.75% C, .ltoreq.0.1% B, .ltoreq.1% submicron oxide particles and/or electrically insulating or electrically conductive covalent ceramic particles, .ltoreq.1% rare earth metal, and/or .ltoreq.3% Cu.Type: GrantFiled: December 4, 1997Date of Patent: February 29, 2000Assignee: Philip Morris IncorporatedInventors: Mohammad R. Hajaligol, Clive Scorey, Vinod K. Sikka, Seetharama C. Deevi, Grier Fleischhauer, A. Clifton Lilly, Jr., Randall M. German