Nickel Containing Patents (Class 148/336)
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Publication number: 20140000769Abstract: A hot rolled steel sheet includes, as a chemical composition, at least one selected from Ti, REM, and Ca, and includes, as a metallographic structure, a ferrite as a primary phase, at least one of a martensite and a residual austenite as a secondary phase, and plural inclusions, wherein a total length in the rolling direction of both inclusion-cluster whose length in the rolling direction is 30 ?m or more and independent-inclusion whose length in the rolling direction is 30 ?m or more is 0 mm to 0.25 mm per 1 mm2.Type: ApplicationFiled: March 16, 2012Publication date: January 2, 2014Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Yuzo Takahashi, Junji Haji, Osamu Kawano
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Publication number: 20130340898Abstract: Provided are a high-strength cold-rolled steel sheet having excellent formability, excellent ductility, excellent hole expansibility, and high yield ratio and a method for producing the same. The high-strength cold-rolled steel sheet contains 0.05% to 0.15% C, 0.10% to 0.90% Si, 1.0% to 2.0% Mn, 0.005% to 0.05% P, 0.0050% or less S, 0.01% to 0.10% Al, 0.0050% or less N, and 0.010% to 0.100% Nb, which are chemical components, on a mass basis, the balance being Fe and unavoidable impurities; has a microstructure which is a multi-phase structure containing 90% or more of a ferrite phase and 0.5% to less than 5.0% of a martensite phase on a volume fraction basis, the remainder being low-temperature transformation phases; and has a yield ratio of 70% or more.Type: ApplicationFiled: November 30, 2011Publication date: December 26, 2013Applicant: JFE STEEL CORPORATIONInventors: Katsutoshi Takashima, Yuki Toji, Kohei Hasegawa
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Patent number: 8613809Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3+MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.Type: GrantFiled: May 23, 2007Date of Patent: December 24, 2013Assignee: Kobe Steel, Ltd.Inventors: Tomoko Sugimura, Sei Kimura, Koichi Sakamoto, Atsuhiko Yoshida, Takeshi Inoue
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Publication number: 20130319582Abstract: The present invention provides a bainite-containing-type high-strength hot-rolled steel sheet. The steel sheet, containing C: greater than 0.07 to 0.2%, Si: 0.001 to 2.5%, Mn: 0.01 to 4%, P: 0.15% or less, S: 0.03% or less, N: 0.01% or less, Al: 0.001 to 2% and a balance being composed of Fe and impurities, has an average value of pole densities of the {100}<011> to {223}<110> orientation group at a sheet thickness center portion being a range of ? to ? in sheet thickness from the surface of the steel sheet is 4.0 or less, and a pole density of the {332}<113> crystal orientation is 4.8 or less, an average crystal grain diameter is 10 ?m or less and vTrs is ?20° C. or lower, and a microstructure is composed of 35% or less in a structural fraction of pro-eutectoid ferrite and a balance of a low-temperature transformation generating phase.Type: ApplicationFiled: March 29, 2012Publication date: December 5, 2013Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Tatsuo Yokoi, Hiroshi Shuto, Riki Okamoto, Nobuhiro Fujita, Kazuaki Nakano, Takeshi Yamamoto
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Publication number: 20130306200Abstract: The present invention provides a non-oriented electrical steel sheet at low cost that has excellent magnetic properties and mechanical properties as well as excellent quality of steel sheet. The non-oriented electrical steel sheet has a chemical composition containing, by mass %, Si: 5.0% or less, Mn: 2.0% or less, Al: 2.0% or less, and P: 0.05% or less, in a range satisfying formula (1), and furthermore, C: 0.008% or more and 0.040% or less; N: 0.003% or less, and Ti: 0.04% or less, in a range satisfying formula (2), with the balance composed of Fe and incidental impurities: 300?85[Si %]+16[Mn %]+40[Al %]+490[P %]?430??(1) 0.008?Ti*<1.2[C %]??(2), where Ti*=Ti?3.4[N %].Type: ApplicationFiled: February 24, 2011Publication date: November 21, 2013Applicant: JFE Steel CorporationInventors: Masaaki Kohno, Yoshiaki Zaizen, Yoshihiko Oda, Akira Fujita
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Patent number: 8585835Abstract: A high-strength steel machined product giving excellent hardenability has a metal microstructure with excellent balance of strength and toughness and high stability of retained austenite. The product is composed of an ultra-high low-alloy TRIP steel having a metal microstructure which contains an appropriate quantity of two or more of Cr, Mo, and Ni, and an appropriate quantity of one or more of Nb, Ti, and V, and having an appropriate value of carbon equivalent; the metal microstructure has a mother-phase structure composed mainly of lathy bainitic ferrite with a small amount of granular bainitic ferrite and polygonal ferrite, and has a secondary-phase structure composed of fine retained austenite and martensite.Type: GrantFiled: October 29, 2009Date of Patent: November 19, 2013Assignees: Usui Kokusai Sangyo Kaisha Limited, Shinshu UniversityInventors: Koh-ichi Sugimoto, Sho-hei Sato, Teruhisa Takahashi, Goro Arai
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Patent number: 8580050Abstract: Disclosed is a carburized machine part which is free from the problem of decreased strength at edge-shaped parts due to excess introduction of carbon. The machine part is produced by processing a case hardening steel of the alloy composition consisting essentially of, by weight %, C: 0.1-0.3%, Si: 0.5-3.0%, Mn: 0.3-3.0%, P: up to 0.03%, S: up to 0.03%, Cu: 0.01-1.00%, Ni: 0.01-3.00%, Cr: 0.3-1.0%, Al: up to 0.2% and N: up to 0.05% and the balance of Fe and inevitable impurities, and satisfying the following condition: [Si %]+[Ni %]+Cu %]?[Cr %]>0.5 and carburizing by vacuum carburization.Type: GrantFiled: August 22, 2006Date of Patent: November 12, 2013Assignee: Daido Steel Co., Ltd.Inventors: Toshiyuki Morita, Tomoki Hanyuda
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Publication number: 20130292010Abstract: A high-strength galvanized steel sheet contains C: 0.010% or more and 0.06% or less, Si: more than 0.5% and 1.5% or less, Mn: 1.0% or more and 3.0% or less, P: 0.005% or more and 0.1% or less, S: 0.01% or less, sol.Al: 0.005% or more and 0.5% or less, N: 0.01% or less, Nb: 0.010% or more and 0.090% or less, and Ti: 0.015% or more and 0.15% or less, on a mass percent basis. The Nb and C contents of the steel satisfy the relation of (Nb/93)/(C/12)<0.20. C* satisfies 0.005?C*?0.025. Ferrite constitutes 70% by area ratio or more of the steel sheet. Martensite constitutes 3% by area ratio or more of the steel sheet. C*=C?(12/93)Nb?(12/48){Ti?(48/14)N}, wherein C, Nb, Ti, and N denote the C, Nb, Ti, and N contents of the steel.Type: ApplicationFiled: September 15, 2011Publication date: November 7, 2013Applicant: JFE Steel CorporationInventors: Hideyuki Kimura, Kaneharu Okuda, Reiko Sugihara
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Publication number: 20130284324Abstract: Provided is a steel sheet for an oil sand slurry pipe having excellent abrasion resistance, corrosion resistance, and low-temperature toughness including 0.2 wt % to 0.35 wt % of carbon (C), 0.1 wt % to 0.5 wt % of silicon (Si), 0.5 wt % to 1.8 wt % of manganese (Mn), 0.1 wt % to 0.6 wt % of nickel (Ni), 0.005 wt % to 0.05 wt % of niobium (Nb), 0.005 wt % to 0.02 wt % of titanium (Ti), 0.03 wt % or less of phosphorous (P), 0.03 wt % or less of sulfur (S), 0.05 wt % or less (excluding 0 wt %) of aluminum (Al), 0.01 wt % or less (excluding 0 wt %) of nitrogen (N), and iron (Fe) as well as other unavoidable impurities as a remainder.Type: ApplicationFiled: December 21, 2011Publication date: October 31, 2013Applicant: POSCOInventors: Seong-Ung Koh, Hwan-Gyo Jung
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Publication number: 20130276940Abstract: A steel having a composition that includes C: 0.05 to 0.15%, Si: 0.2 to 1.2%, Mn: 1.0 to 2.0%, Al: 0.005 to 0.10%, N: 0.006% or less, and at least one selected from Ti: 0.03 to 0.13%, Nb: 0.02 to 0.10%, and V: 0.02 to 0.15% is subjected to rough rolling at a reduction of 80% or more and finish rolling at a finish rolling delivery temperature in the range of 800 to 950° C. The finish rolled sheet is subjected to cooling including cooling the finish rolled sheet from the finish rolling delivery temperature to a cooling end temperature in the range of 550 to 610° C. at an average cooling rate of 25° C./sec. or more and cooling the finish rolled sheet from the cooling end temperature of the previous process to a coiling temperature at an average cooling rate of 100° C./sec. or more.Type: ApplicationFiled: September 15, 2011Publication date: October 24, 2013Applicant: JFE Steel CorporationInventors: Katsumi Nakajima, Hayato Saito, Yoshimasa Funakawa, Noriaki Moriyasu, Takayuki Murata
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Publication number: 20130279971Abstract: An electron-beam welded joint including, by mass %, C: 0.02% to 0.1%, Si: 0.03% to 0.30%, Mn: 1.5% to 2.5%, Ti: 0.005 to 0.015%, N: 0.0020 to 0.0060%, O: 0.0010% to 0.0035%, Nb: 0% to 0.020%, V: 0% to 0.030%, Cr: 0% to 0.50%, Mo: 0% to 0.50%, Cu: 0% to 0.25%, Ni: 0% to 0.50%, B: 0% to 0.0030%, S: limited to 0.010% or less, P: limited to 0.015% or less, Al: limited to 0.004% or less, and a balance consisting of iron and unavoidable impurities, wherein an index value CeEB is 0.49% to 0.60%, a number of oxides having an equivalent circle diameter of 1.0 ?m or more is 20 pieces/mm2 or less, and a number of oxides having an equivalent circle diameter of 0.05 ?m or more and less than 0.5 ?m is 1×103 pieces/mm2 to 1×105 pieces/mm2 at a thickness center portion.Type: ApplicationFiled: October 27, 2011Publication date: October 24, 2013Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Ryuichi Honma, Ryuji Uemori, Tadashi Ishikawa, Akihiko Kojima, Manabu Hoshino
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Publication number: 20130263975Abstract: The present invention provides a wire rod with a composition at least including: C: 0.95-1.30 mass %; Si: 0.1-1.5 mass %; Mn: 0.1-1.0 mass %; Al: 0-0.1 mass %; Ti: 0-0.1 mass %; P: 0-0.02 mass %; S: 0-0.02 mass %; N: 10-50 ppm; O: 10-40 ppm; and a balance including Fe and inevitable impurities, wherein 97% or more of an area in a cross-section perpendicular to the longitudinal direction of the wire rod is occupied by a pearlite, and 0.5% or less of an area in a central area in the cross-section and 0.5% or less of an area in a first surface layer area in the cross-section are occupied by a pro-eutectoid cementite.Type: ApplicationFiled: May 21, 2013Publication date: October 10, 2013Inventors: Shingo YAMASAKI, Toshiyuki MANABE, Daisuke HIRAKAMI, Nariyasu MUROGA
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Patent number: 8551397Abstract: The invention relates to a manufacturing process for steel blanks. The invention relates in particular to a manufacturing process of a steel blank comprising electroslag remelting (ESR—ElectroSlag Remelting) or vacuum arc remelting (VAR—Vacuum Arc Remelting) to obtain very good mechanical properties. The blanks obtained can be used especially in the field of the manufacture of pressurized equipment elements and especially cannon tubes.Type: GrantFiled: September 13, 2011Date of Patent: October 8, 2013Assignee: Aubert & DuvalInventors: Gérald Gay, Bruno Gaillard-Allemand
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Publication number: 20130240094Abstract: The present invention provides a bake-hardenable high-strength cold-rolled steel sheet having excellent bake hardenability, cold aging resistance, and deep-drawability, and reduced planar anisotropy, containing chemical components in % by mass of: C: 0.0010% to 0.0040%, Si: 0.005% to 0.05%, Mn: 0.1% to 0.8%, P: 0.01% to 0.07%, S: 0.001% to 0.01%, Al: 0.01% to 0.08%, N: 0.0010% to 0.0050%, Nb: 0.002% to 0.020%, and Mo: 0.005% to 0.050%, a value of [Mn %]/[P %] being in the range of 1.6 to 45, where [Mn %] is an amount of Mn and [P %] is an amount of P, an amount of C in solid solution obtained from [C %]?(12/93)×[Nb %] being in the range of 0.0005% to 0.Type: ApplicationFiled: April 27, 2011Publication date: September 19, 2013Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Satoshi Akamatsu, Masaharu Oka
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Patent number: 8535459Abstract: The present invention provides a steel material for hardening, including chemical components, by mass %, of: C: 0.15 to 0.60%; Si: 0.01 to 1.5%; Mn: 0.05 to 2.5%; P: 0.005 to 0.20%; S: 0.001 to 0.35%; Al: over 0.06 to 0.3%; and total N: 0.006 to 0.03%, with a balance including Fe and inevitable impurities including B of not more than 0.0004%, in which a hardness R at a position 5 mm away from a quenching end measured through a Jominy-type end-quenching method specified in JIS G 0561, and a calculation hardness H at a position 4.763 mm away from the quenching end satisfy the following Equation (1). H×0.948?R?H×1.Type: GrantFiled: May 17, 2011Date of Patent: September 17, 2013Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Kei Miyanishi, Manabu Kubota, Shuji Kozawa
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Publication number: 20130233453Abstract: A thin high strength steel sheet having excellent formability has a composition which includes, by mass %, 0.08 to 0.15% of C, 0.5 to 1.5% of Si, 0.5 to 1.5% of Mn, 0.01 to 0.1% of Al, and 0.005% or less of N to form a hot rolled sheet is conducted.Type: ApplicationFiled: June 29, 2011Publication date: September 12, 2013Applicant: JFE STEEL CORPORATIONInventors: Kenji Kawamura, Hidetaka Kawabe, Kazuhiro Seto, Noriyuki Katayama
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Patent number: 8529829Abstract: Disclosed herein is a high-strength hot-rolled steel sheet which is characterized by high strength (in terms of tensile strength at 900 MPa level) and excellent combined formability expressed by balance between strength and ductility [tensile strength (TS)×total elongation (El)] and balance between strength and stretch flangeability [tensile strength (TS)×bore expanding ratio (?)]. The hot-rolled steel sheet contains C: no less than 0.02% and no more than 0.15%, Si: no less than 0.2% and no more than 2.0%, Mn: no less than 0.5% and no more than 2.5%, Al: no less than 0.02% and no more than 0.15%, Cu: no less than 1.0% and no more than 3.0%, Ni: no less than 0.5% and no more than 3.0%, and Ti: no less than 0.03% and no more than 0.5%. (% means mass %) It also has a metallographic structure in longitudinal cross section such that the sum of bainitic ferrite and granular bainitic ferrite accounts for no less than 85% by area.Type: GrantFiled: March 14, 2007Date of Patent: September 10, 2013Assignee: Kobe Steel, Ltd.Inventors: Motoo Satou, Tetsuo Soshiroda
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Publication number: 20130213529Abstract: A high-strength cold rolled steel sheet having excellent deep drawability and bake hardenability, with a tensile strength ?440 MPa, an average r-value ?1.20 and a bake hardening value ?40 MPa, is obtained by subjecting a steel raw material having a chemical composition including C: 0.010-0.06 mass %, Si: more than 0C:\Users\ejensen\Desktop\!TEMP\.5 mass % but not more than 1.5 mass %, Mn: 1.0-3.0 mass %, Nb: 0.010-0.090 mass %, Ti: 0.015-0.15 mass % and satisfying (Nb/93)/(C/12)<0.20 to hot rolling, cold rolling and then to annealing including steps of heating to a temperature of 800-900° C. while a temperature region of 700-800° C. is an average heating rate <3° C./s, and soaking and thereafter cooling at a rate ?5° C./s from the soaking temperature to a cooling stop temperature ?500° C. to thereby form a microstructure including ferrite phase with an area ratio ?70% and martensite phase with an area ratio ?3%.Type: ApplicationFiled: October 28, 2011Publication date: August 22, 2013Applicant: JFE Steel CorporationInventors: Hideyuki Kimura, Yasunobu Nagataki
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Patent number: 8500924Abstract: A high-strength steel plate includes the following composition: 0.18 to 0.23 mass % of C; 0.1 to 0.5 mass % of Si; 1.0 to 2.0 mass % of Mn; 0.020 mass % or less of P; 0.010 mass % or less of S; greater than 0.5 mass % and equal to or less than 3.0 mass % of Cu, 0.25 to 2.0 mass % of Ni; 0.003 to 0.10 mass % of Nb; 0.05 to 0.15 mass % of Al; 0.0003 to 0.0030 mass % of B; 0.006 mass % or less of N; and a balance composed of Fe and inevitable impurities. A weld crack sensitivity index Pcm of the high-strength steel plate is calculated by Pcm=[C]+[Si]/30+[Mn]/20+[Cu]/20+[Ni]/60+[Cr]/20+[Mo]/15+[V]/10+5[B], and is 0.39 mass % or less. The Ac3 transformation point is equal to or less than 850° C., the percentage value of a martensite structure is equal to or greater than 90%, the yield strength is equal to or greater than 1300 MPa, and the tensile strength is equal to or greater than 1400 MPa and equal to or less than 1650 MPa.Type: GrantFiled: October 13, 2009Date of Patent: August 6, 2013Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Tatsuya Kumagai, Akira Usami, Masaharu Oka
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Publication number: 20130186521Abstract: This profiled wire, of NACE grade, made of low-alloy carbon steel intended to be used in the offshore oil exploitation sector, is characterized in that it has the following chemical composition, expressed in percentages by weight of the total mass: 0.75<% C<0.95; 0.30<% Mn<0.85; Cr?0.4%; V?0.16%; Si?1.40% and preferably ?0.15%; and optionally no more than 0.06% Al, no more than 0.1% Ni and no more than 0.Type: ApplicationFiled: March 23, 2011Publication date: July 25, 2013Applicant: ARCELOMITTAL WIRE FRANCEInventors: Sylvain Foissey, Christophe Bertout, Xavier Perroud
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Publication number: 20130174941Abstract: The present invention provides steel containing manganese and nickel that is used as a structural material for a cryogenic storage container for liquefied natural gas (LNG) or the like, and a manufacturing method thereof; and more particularly, to steel having good cryogenic temperature toughness and also high strength by adding low-cost Mn instead of relatively expensive Ni at an optimized ratio, refining a microstructure through controlled rolling and cooling, and precipitating retained austenite through tempering, and a manufacturing method of the steel. To achieve the object, the technical feature of the present invention is a method of manufacturing high-strength steel with cryogenic temperature toughness. In the method, a steel slab is heated to a temperature within a range of 1,000 to 1,250° C., wherein the steel slab includes, by weight: 0.01-0.06% of carbon (C), 2.0-8.0% of manganese (Mn), 0.01-6.0% of nickel (Ni), 0.02-0.6% of molybdenum (Mo), 0.03-0.5% of silicon (Si), 0.003-0.Type: ApplicationFiled: November 21, 2011Publication date: July 11, 2013Applicant: POSCOInventors: Kyung-Keun Um, Jong-Kyo Choi, Woo-Kil Jang, Hee-Goon Noh, Hyun-Kwan Cho
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Publication number: 20130167980Abstract: This high-strength steel sheet includes by mass percentage: 0.05 to 0.4% of C; 0.1 to 2.5% of Si; 1.0 to 3.5% of Mn; 0.001 to 0.03% of P; 0.0001 to 0.01% of S; 0.001 to 2.5% of Al; 0.0001 to 0.01% of N; 0.0001 to 0.008% of O; and a remainder composed of iron and inevitable impurities, wherein a steel sheet structure contains by volume fraction 10 to 50% of a ferrite phase, 10 to 50% of a tempered martensite phase, and a remaining hard phase, wherein a 98% hardness is 1.5 or more times as high as a 2% hardness in a range from ? to ? of a thickness of the steel sheet, wherein a kurtosis K* of the hardness distribution between the 2% hardness and the 98% hardness is ?1.2 to ?0.4, and wherein an average crystal grain size in the steel sheet structure is 10 ?m or less.Type: ApplicationFiled: September 16, 2011Publication date: July 4, 2013Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Hiroyuki Kawata, Naoki Maruyama, Akinobu Murasato, Naoki Yoshinaga, Chisato Wakabayashi, Noriyuki Suzuki
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Publication number: 20130167985Abstract: A steel sheet including C at 0.05 to 0.15%, Si at 0.2 to 1.2%, Mn at 1.0 to 2.0%, P at not more than 0.04%, S at not more than 0.0030%, Al at 0.005 to 0.10%, N at not more than 0.005% and Ti at 0.03 to 0.13%, the balance being Fe and inevitable impurities, includes surface regions having an area fraction of bainite of less than 80% and an area fraction of a ferrite phase with a grain diameter of 2 to 15 ?m of not less than 10%, the surface regions extending from both surfaces of the steel sheet each to a depth of 1.5 to 3.0% relative to a total sheet thickness, as well as an inner region other than the surface regions having an area fraction of a bainite phase of more than 95%, and has a tensile strength of not less than 780 MPa.Type: ApplicationFiled: September 15, 2011Publication date: July 4, 2013Applicant: JFE Steel CorporationInventors: Hayato Saito, Katsumi Nakajima, Yoshimasa Funakawa, Noriaki Moriyasu, Takayuki Murata
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Publication number: 20130160904Abstract: The steel sheet includes C: 0.04 to 0.12%, Si: 0.5 to 1.2%, Mn: 1.0 to 1.8%, P: not more than 0.03%, S: not more than 0.0030%, Al: 0.005 to 0.20%, N: not more than 0.005% and Ti: 0.03 to 0.13%, the balance being Fe and inevitable impurities, includes a microstructure containing a bainite phase at an area fraction exceeding 95% and having an average grain diameter of not more than 3 ?m, has a difference ?Hv1 of not more than 50 between a Vickers hardness value at 50 ?m from the surface and a Vickers hardness value at ¼ of a sheet thickness, has a difference ?Hv2 of not more than 40 between the Vickers hardness value at ¼ of the sheet thickness and a Vickers hardness value at ½ of the sheet thickness.Type: ApplicationFiled: September 15, 2011Publication date: June 27, 2013Inventors: Hayato Saito, Katsumi Nakajima, Yoshimasa Funakawa, Noriaki Moriyasu, Takayuki Murata
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Publication number: 20130160906Abstract: A method for producing a motor vehicle component having two regions, with different strength is disclosed. A first one of the two regions has a high strength and a second one of the two regions has a higher ductility and lower strength relative to the first region. In a motor vehicle component produced with the method, the first region has a strength between 1400 and 1600 MPa at a breaking elongation A5>13% and the second region has a tensile strength between 950 and 1050 MPa at a breaking elongation A5>16%.Type: ApplicationFiled: December 18, 2012Publication date: June 27, 2013Applicant: Benteler Automobiltechnik GmbHInventor: Benteler Automobiltechnik GmbH
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Patent number: 8470099Abstract: The present invention provides a wire rod with a composition at least including: C: 0.95-1.30 mass %; Si: 0.1-1.5 mass %; Mn: 0.1-1.0 mass %; Al: 0-0.1 mass %; Ti: 0-0.1 mass %; P: 0-0.02 mass %; S: 0-0.02 mass %; N: 10-50 ppm; O: 10-40 ppm; and a balance including Fe and inevitable impurities, wherein 97% or more of an area in a cross-section perpendicular to the longitudinal direction of the wire rod is occupied by a pearlite, and 0.5% or less of an area in a central area in the cross-section and 0.5% or less of an area in a first surface layer area in the cross-section are occupied by a pro-eutectoid cementite.Type: GrantFiled: October 19, 2010Date of Patent: June 25, 2013Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Shingo Yamasaki, Toshiyuki Manabe, Daisuke Hirakami, Nariyasu Muroga
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Publication number: 20130153091Abstract: A hot-rolled steel sheet has an average value of the X-ray random intensity ratio of a {100} <011> to {223} <110> orientation group at least in a sheet thickness central portion that is in a sheet thickness range of ? to ? from a steel sheet surface of 1.0 to 6.0, an X-ray random intensity ratio of a {332} <113> crystal orientation of 1.0 to 5.0, rC which is an r value in a direction perpendicular to a rolling direction of 0.70 to 1.10, and r30 which is an r value in a direction that forms an angle of 30° with respect to the rolling direction of 0.70 to 1.10.Type: ApplicationFiled: July 27, 2011Publication date: June 20, 2013Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Nobuhiro Fujita, Kunio Hayashi, Riki Okamoto, Manabu Takahashi, Tetsuo Kishimoto, Hiroshi Yoshida
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Patent number: 8460481Abstract: The invention is directed to providing, for application in automobiles, construction materials, household appliances and the like, high-strength sheets excellent in formability properties such as hole expansibility and ductility, and also in fatigue resistance, characterized in comprising, in specified contents expressed in mass %, C, Si, Mn, P, S, Al, N and O and a balance of iron and unavoidable impurities, and having a steel sheet structure composed mainly of ferrite and hard structures, a crystal orientation difference between some ferrite adjacent to hard structures and the hard structures of less than 9°, and a maximum tensile strength of 540 MPa or greater.Type: GrantFiled: April 9, 2009Date of Patent: June 11, 2013Assignee: Nippon Steel & Sumitomo Metal CorporationInventors: Masafumi Azuma, Noriyuki Suzuki, Naoki Maruyama, Naoki Yoshinaga, Akinobu Murasato
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Publication number: 20130133792Abstract: A high-strength cold rolled steel sheet has excellent formability and crashworthiness and includes, on a mass % basis, C: 0.05 to 0.3%, Si: 0.3 to 2.5%. Mn: 0.5 to 3.5%, P: 0.003 to 0.100%, 5: 0.02% or less, Al: 0.010 to 0.5%, the balance being iron and unavoidable impurities, the high-strength cold rolled steel sheet having a microstructure including 20% or more of ferrite on an area fraction basis, 10 to 60% of tempered martensite on an area fraction basis, 0 to 10% of martensite on an area fraction basis, and 3 to 15% of retained austenite on a volume fraction basis.Type: ApplicationFiled: August 12, 2010Publication date: May 30, 2013Applicant: JFE STEEL CORPORATIONInventors: Tatsuya Nakagaito, Saiji Matsuoka, Shinjiro Kaneko, Yoshiyasu Kawasaki
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Publication number: 20130133789Abstract: A predetermined composition is had, when a C content is represented by (C %), in a case of (C %) being not less than 0.35% nor more than 0.65%, a volume fraction of pearlite is 64×(C %)+52% or more, and in a case of (C %) being greater than 0.65% and 0.85% or less, the volume fraction of pearlite is not less than 94% nor more than 100%, and a structure of the other portion is composed of one or two of proeutectoid ferrite and bainite. Further, in a region to a depth of 1.0 mm from a surface, a volume fraction of pearlite block having an aspect ratio of 2.0 or more is not less than 70% nor more than 95%, and a volume fraction of pearlite having an angle between an axial direction and a lamellar direction on a cross section parallel to the axial direction of 40° or less is 60% or more with respect to all pearlite.Type: ApplicationFiled: August 11, 2011Publication date: May 30, 2013Inventors: Makoto Okonogi, Shingo Yamasaki, Akifumi Kawana, Hideaki Gotohda
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Publication number: 20130087252Abstract: A high-strength hot-rolled steel sheet has a composition including C: 0.005% or more and 0.050% or less, Si: 0.2% or less, Mn: 0.8% or less, P: 0.025% or less, S: 0.01% or less, N: 0.01% or less, Al: 0.06% or less, and Ti: 0.05% or more and 0.10% or less, on a mass percent basis, such that S, N, and Ti satisfy Ti?0.04+(N/14×48+S/32×48), the remainder being Fe and incidental impurities; a matrix in which a ferrite phase constitutes 95% by area or more of the entire structure; and a structure in which Ti-containing fine carbide having an average grain size of less than 10 nm is dispersedly precipitated, and the volume ratio of the fine carbide to the entire structure is 0.0007 or more.Type: ApplicationFiled: June 24, 2011Publication date: April 11, 2013Applicant: JFE STEEL CORPORATIONInventors: Tamako Ariga, Katsumi Nakajima, Yoshimasa Funakawa, Noriaki Moriyasu, Takayuki Murata
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Patent number: 8398787Abstract: A high-strength steel sheet is provided which, even when subjected to long-term stress-relief annealing after welding, decreases little in strength and which has satisfactory low-temperature HAZ toughness. The high-strength steel sheet has a chemical composition adequately regulated and has a CP value defined by the following equation (1) of 5.40% or higher and a carbon equivalent (Ceq) defined by the following equation (2) of 0.45% or lower. CP value=125[Ti]+111[Nb]+60[V]+15[Mo] (1) ([Ti], [Nb], [V], and [Mo] indicate the contents (mass %) of Ti, Nb, V, and Mo, respectively.) Ceq=[C]+[Mn]/6+([Cr]+[Mo]+[V])/5+([Cu]+[Ni])/15 (2) ([C], [Mn], [Cr], [Mo], [V], [Cu], and [Ni] indicate the contents (mass %) of C, Mn, Cr, Mo, V, Cu, and Ni, respectively.Type: GrantFiled: March 16, 2009Date of Patent: March 19, 2013Assignee: Kobe Steel, Ltd.Inventor: Makoto Kariyazaki
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Patent number: 8394319Abstract: Nickel, Ni, of 5 to 10 mass %, silicon, Si, of 0.5 to 5 mass %, manganese, Mn, of 0.01 to 1 mass %, carbon, C, of 0.2 to 2 mass % and a remaining part consisting of iron, Fe, and incidental impurities are employed, and further chromium, Cr, of 1 to 10 mass % is added to obtain a martensitic cast steel material for which a martensitic transformation finish temperature (Mf point) is below freezing. Further, a cast steel material that contains vanadium V of 0.1 to 5 mass % in addition to the above elements of the material is also obtained. For these cast steel materials, since martensitic transformation occurs merely by performing a sub-zero treatment, the tempering process can be comparatively easily performed, and machining in a desired shape is easily performed.Type: GrantFiled: February 19, 2010Date of Patent: March 12, 2013Assignees: Yamagataken, Yugen Kaisha Watanabe Chuzo-ShoInventors: Toshitaka Watanabe, Toru Yamada, Noboru Sato, Satoshi Nakano, Toshiro Matsuki
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Publication number: 20130048151Abstract: A cold rolled steel sheet with excellent bendability contains C at 0.15 to 0.30%, Si at 0.01 to 1.8%, Mn at 1.5 to 3.0%, P at not more than 0.05%, S at not more than 0.005%, Al at 0.005 to 0.05% and N at not more than 0.005%, the balance being Fe and inevitable impurities, and has a steel sheet superficial soft portion satisfying: Hv(S)/Hv(C)?0.8??(1) wherein Hv(S) is hardness of the steel sheet superficial soft portion, and Hv(C) is hardness of a steel sheet core portion, 0.10?t(S)/t?0.30??(2) wherein t(S) is thickness of the steel sheet superficial soft portion, and t is the sheet thickness.Type: ApplicationFiled: February 16, 2011Publication date: February 28, 2013Applicant: JFE STEEL CORPORATIONInventors: Kenji Kawamura, Kazuhiro Seto
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Publication number: 20130048161Abstract: A high strength press-formed member includes a steel sheet constituting the member including a composition including by mass %, C: 0.12% to 0.69%, Si: 3.0% or less, Mn: 0.5% to 3.0%, P: 0.1% or less, S: 0.07% or less, Al: 3.0% or less, N: 0.010% or less, Si+Al: at least 0.Type: ApplicationFiled: February 28, 2011Publication date: February 28, 2013Applicant: JFE Steel CorporationInventors: Hiroshi Matsuda, Yoshimasa Funakawa, Yasushi Tanaka
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Publication number: 20130048158Abstract: Disclosed is high strength spring steel that can limit the depth of pitting occurring when corroded and therefore possesses high strength as well as excellent pitting corrosion resistance and corrosion fatigue property, with a composition containing: C: greater than 0.35 mass % and less than 0.50 mass %; Si: greater than L75 mass % and less than or equal to 3.00 mass %; Mn: 0.2 mass % to 1.0 mass %; Cr: 0.01 mass % to 0.04 mass %; P: 0.025 mass % or less; S: 0.025 mass % or less; Mo: 0.1 mass % to 1.0 mass %; and 0: 0.0015 mass % or less, under a condition that a PC value calculated by PC=4.2×([C]+[Mn])+0.1×(1/[Si]+1/[Mo])+20.3×[Cr]+0.001×(1/[N]) is greater than 3.3 and equal to or less than 8.0. Also disclosed is a preferred method for manufacturing the same.Type: ApplicationFiled: February 28, 2011Publication date: February 28, 2013Applicant: JFE STEEL CORPORATIONInventors: Minoru Honjo, Kazukuni Hase, Hideto Kimura
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Publication number: 20130037180Abstract: A high-strength cold-rolled steel sheet includes, by mass %, C: 0.10% to 0.40%, Mn: 0.5% to 4.0%, Si: 0.005% to 2.5%, Al: 0.005% to 2.5%, Cr: 0% to 1.0%, and a balance of iron and inevitable impurities, in which an amount of P is limited to 0.05% or less, an amount of S is limited to 0.02% or less, an amount of N is limited to 0.006% or less, the microstructure includes 2% to 30% of retained austenite by area percentage, martensite is limited to 20% or less by area percentage in the microstructure, an average particle size of cementite is 0.01 ?m to 1 ?m, and 30% to 100% of the cementite has an aspect ratio of 1 to 3.Type: ApplicationFiled: January 26, 2011Publication date: February 14, 2013Applicant: NIPPON STEEL CORPORATIONInventors: Kohichi Sano, Chisato Wakabayashi, Hiroyuki Kawata, Riki Okamoto, Naoki Yoshinaga, Kaoru Kawasaki, Natsuko Sugiura, Nobuhiro Fujita
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Patent number: 8372335Abstract: The invention provides an austenitic ductile cast iron alloy composition including about 2.2% to about 2.4% by weight carbon; about 3.5% to about 4.0% by weight silicon; about 28% to about 29% by weight nickel; about 2.5% to about 3.0% by weight chromium; about 0.9% to about 1.1% by weight molybdenum; and greater than about 50% iron, wherein percentages are based on the overall weight of the composition. The invention further provides articles, such as turbocharger housings, prepared using the inventive alloys.Type: GrantFiled: January 14, 2010Date of Patent: February 12, 2013Assignee: Honeywell International Inc.Inventors: Antoine Claude, Marc Wilson, Rayad Benchiheub, Lydie Tenet Schmitt, Angelique Rouillon
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Patent number: 8361248Abstract: The present invention provides a high strength steel having unprecedentedly superior CTOD (fracture toughness) properties satisfying not only the CTOD properties of the FL zone at ?60° C., but also the CTOD properties of the ICHAZ zone in small and medium heat input multilayer welding, etc.; and a method of production of the same. The steel of the present invention is steel superior in CTOD properties of the heat-affected zone containing, by mass %, C: 0.015 to 0.045%, Si: 0.05 to 0.2%, Mn: 1.5 to 2.0%, Cu: 0.25 to 0.5%, Ni: 0.7 to 1.5%, P: 0.008% or less, S: 0.005% or less, Al: 0.004% or less, Ti: 0.005 to 0.015%, Nb: 0.005% or less, O: 0.0015 to 0.0035%, and N: 0.002 to 0.006%, PCTOD: 0.065 or less, CeqH: 0.235 or less and the balance consisting of Fe and unavoidable impurities.Type: GrantFiled: December 4, 2008Date of Patent: January 29, 2013Assignee: Nippon Steel CorporationInventors: Rikio Chijiiwa, Ryuji Uemori, Yoshiyuki Watanabe, Kazuhiro Fukunaga, Akihiko Kojima, Yoshihide Nagai
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Patent number: 8361246Abstract: A pearlite rail contains, by mass %, 0.65 to 1.20% of C; 0.05 to 2.00% of Si; 0.05 to 2.00% of Mn; and the balance composed of Fe and inevitable impurities, wherein at least part of the head portion and at least part of the bottom portion has a pearlite structure, and the surface hardness of a portion of the pearlite structure is in a range of Hv320 to Hv500 and a maximum surface roughness of a portion of the pearlite structure is less than or equal to 180 ?m.Type: GrantFiled: August 13, 2010Date of Patent: January 29, 2013Assignee: Nippon Steel CorporationInventors: Masaharu Ueda, Kyohei Sonoyama, Takuya Tanahashi, Teruhisa Miyazaki, Katsuya Iwano
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Patent number: 8353992Abstract: Steel sheet having a composition of ingredients containing substantially, by mass %, C: 0.005 to 0.200%, Si: 2.50% or less, Mn: 0.10 to 3.00%, N: 0.0100% or less, Nb: 0.005 to 0.100%, and Ti: 0.002 to 0.150% and satisfying the relationship of Ti?48/14×N?0.0005, having a sum of the X-ray random intensity ratios of the {100}<001> orientation and the {110}<001> orientation of a ? sheet thickness part of 5 or less, having a sum of the maximum value of the X-ray random intensity ratios of the {110}<111> to {110}<112> orientation group and the X-ray random intensity ratios of the {211}<111> orientation of 5 or more, and having a high rolling direction Young's modulus measured by the static tension method and a method of production of the same are provided.Type: GrantFiled: November 7, 2007Date of Patent: January 15, 2013Assignee: Nippon Steel CorporationInventors: Natsuko Sugiura, Naoki Maruyama, Manabu Takahashi, Yohji Nakamura, Koji Hanya
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Publication number: 20130008570Abstract: Disclosed is an ultra high strength steel plate with at least 1100 MPa of tensile strength that has both an excellent strength-stretch balance and excellent bending workability, and a method for producing the same. The metal structure of the steel plate has martensite, and the soft phases of bainitic ferrite and polygonal ferrite. The area of the aforementioned martensite constitutes 50% or more, the area of the aforementioned bainitic ferrite constitutes 15% or more, and the area of the aforementioned polygonal ferrite constitutes 5% or less (including 0%). When the circle-equivalent diameter of the aforementioned soft phases is measured, the coefficient of variation (standard deviation/mean value) is less or equal to 1.0. The ultra high strength steel plate has at least 1100 MPa of tensile strength.Type: ApplicationFiled: March 25, 2011Publication date: January 10, 2013Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel Ltd)Inventors: Muneaki Ikeda, Yukihiro Utsumi, Masaaki Miura
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Publication number: 20130000793Abstract: Provided is a steel pipe for a linepipe having high compressive strength, a heavy wall thickness and sour gas resistance. The steel pipe has the composition which contains by mass % 0.02 to 0.06% C, 0.01 to 0.5% Si, 0.8 to 1.6% Mn, 0.012% or less P, 0.0015% or less S, 0.01 to 0.08% Al, 0.005 to 0.050% Nb, 0.005 to 0.025% Ti, 0.0005 to 0.0035% Ca, 0.0020 to 0.0060% N, and Fe and unavoidable impurities as a balance. The steel pipe has metal microstructure where a fraction of bainite is 80% or more, a fraction of M-A constituent is 2% or less and an average grain size of bainite is 5 ?m or less.Type: ApplicationFiled: November 25, 2010Publication date: January 3, 2013Applicant: JFE STEEL CORPORATIONInventors: Nobuyuki Ishikawa, Akihiko Tanizawa, Hitoshi Sueyoshi, Masayuki Horie, Yasumitsu Kiyoto, Nobuo Shikanai
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Publication number: 20130000791Abstract: On a cross section with a sheet width direction of a high-strength hot-rolled steel sheet set as a normal line, with regard to an inclusion having a major diameter of 3.0 ?m or more, a maximum of a major diameter/minor diameter ratio expressed by (a major diameter of the inclusion)/(a minor diameter of the inclusion) is 8.0 or less, and a sum total of a rolling direction length per 1 mm2 cross section of a predetermined inclusion group composed of plural inclusions each having a major diameter of 3.0 ?m or more and a predetermined extended inclusion having a length in a rolling direction of 30 ?m or more is 0.25 mm or less. The plural inclusions composing the predetermined inclusion group congregate in both the rolling direction and a direction perpendicular to the rolling direction 50 ?m or less apart from each other. The predetermined extended inclusion is spaced over 50 ?m apart from all the inclusions each having a major diameter of 3.Type: ApplicationFiled: March 9, 2011Publication date: January 3, 2013Inventors: Yuzo Takahashi, Junji Haji, Osamu Kawano
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Publication number: 20130000798Abstract: A steel material has a composition of C: 0.02 to 0.2%, Si: 0.01 to 0.5%, Mn: 0.5 to 2.5%, P: 0.05% or lower, S: 0.05% or lower, Al: 0.1% or lower, and N: 0.01% or lower and, as required, one or two or more elements selected from Cu: 0.01 to 2%, Ni: 0.01 to 5%, Cr: 0.01 to 3%, Mo: 0.01 to 2%, Nb: 0.1% or lower, V: 0.1% or lower, Ti: 0.1% or lower, B: 0.01% or lower, Ca: 0.01% or lower, and REM: 0.1% or lower in terms of % by mass, and the balance Fe with inevitable impurities, in which the microstructure at the ¼ position of the plate thickness contains ferrite and a hard phase, the area fraction of the hard phase is 50 to 90%, and the average aspect ratio of the ferrite is 1.5 or more.Type: ApplicationFiled: December 25, 2009Publication date: January 3, 2013Applicant: JFE STEEL CORPORATIONInventors: Teruki Sadasue, Satoshi Igi
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Patent number: 8343288Abstract: Provided are the following cold-rolled steel sheets: 1) a cold-rolled steel sheet having higher stretch flangeability than conventional steels; 2) a cold-rolled steel sheet having a higher balance between elongation and stretch flangeability than conventional steels; and 3) a cold-rolled steel sheet heightened in all of yield stress, elongation, and stretch flangeability. The cold-rolled steel sheets are characterized by containing 0.03-0.30 mass % carbon, up to 3.0 mass % (including 0 mass %) silicon, 0.1-5.0 mass % manganese, up to 0.1 mass % phosphorus, less than 0.01 mass % sulfur, up to 0.01 mass % nitrogen, and 0.01-1.00 mass % aluminum and having a structure which comprises tempered martensite in an amount of 50% or more (including 100%) in terms of areal proportion and in which the remainder is ferrite.Type: GrantFiled: March 6, 2009Date of Patent: January 1, 2013Assignee: Kobe Steel, Ltd.Inventors: Toshio Murakami, Akira Ibano
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Patent number: 8337643Abstract: A hot rolled steel sheet having a dual phase microstructure with a martensite phase of less than 35% by volume and a ferrite phase of more than 50% by volume and a composition containing by percent weight: 0.01?C?0.2; 0.3?Mn?3; 0.2?Si?2; 0.2?Cr+Ni?2; 0.01?Al?0.10; Mo less than about 0.2%, 0.0005?Ca?0.01, with the balance iron and incidental ingredients. Hot rolled sheet for cold rolling, the silicon range may be from about 0.05% to about 2%, and the amount of molybdenum may be up to 0.5%. Also, the hot rolled steel sheet has a tensile strength of at least 500 megapascals, a hole expansion ratio more than about 50%, and a yield strength/tensile strength ratio less than 70%.Type: GrantFiled: July 22, 2008Date of Patent: December 25, 2012Assignee: Nucor CorporationInventor: Weiping Sun
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Patent number: 8328957Abstract: In an electric resistance welded steel pipe with excellent weld toughness for a line pipe, the area fraction of minute defects each having a maximum length of less than 50 ?m in a projection plane of an electric resistance welded seam is in the range of 0.000006 to 0.026, and the absorbed energy at ?40° C. measured by a method for an impact test of metallic materials is 315 J or more.Type: GrantFiled: May 18, 2007Date of Patent: December 11, 2012Assignee: JFE Steel CorporationInventors: Hiroyasu Yokoyama, Kazuhito Kenmochi, Takatoshi Okabe, Yukinori Iizuka
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Patent number: 8328961Abstract: The invention concerns an iron-nickel alloy strip comprising the following expressed in wt. %: 32?Co+Ni?45%, 0?Co?6.5%, 0?Cr=6.5%, Cu?3%, Si?0.5%, Mn?0.75%, the rest being made up of iron and unavoidable impurities resulting from production, whereof the microstructure has a recrystallized volume fraction ranging from 3 to 97%, whereof the thickness is less than 0.5 mm. The invention also concerns the use thereof in the manufacture of support grids for integrated circuits.Type: GrantFiled: November 4, 2005Date of Patent: December 11, 2012Assignee: Imphy AlloysInventors: Georges Martinez, Pierre-Louis Reydet, Gilles Bresson, Gilles Coccoz, Jean-Luc Spire, Jerome Giusti
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Publication number: 20120305144Abstract: A steel sheet, including: as chemical components, by mass %, 0.05% to 0.35% of C; 0.05% to 2.0% of Si; 0.8% to 3.0% of Mn; 0.01% to 2.0% of Al; equal to or less than 0.1% of P; equal to or less than 0.05% of S; equal to or less than 0.01% of N; and the balance including iron and inevitable impurities, wherein an area ratio of equal to or higher than 50% of a total of a ferrite phase, a bainite phase, and a tempered martensite phase is contained, an area ratio of equal to or higher than 3% of a retained austenite phase is contained, and crystal grains of the retained austenite phase having a number ratio of equal to or higher than 50% satisfy Expression 1, assuming carbon concentration at a position of center of gravity is Cgc and a carbon concentration at a grain boundary is Cgb.Type: ApplicationFiled: January 31, 2011Publication date: December 6, 2012Applicant: NIPPON STEEL CORPORATIONInventors: Riki Okamoto, Natsuko Sugiura, Kohichi Sano, Chisato Wakabayashi, Naoki Yoshinaga, Kaoru Kawasaki