With Working Patents (Class 148/546)
  • Patent number: 10961610
    Abstract: Provided according to one embodiment of the present invention are a non-magnetic steel material and a method for manufacturing the same. The steel material comprises 15-27 wt % of manganese, 0.1-1.1 wt % of carbon, 0.05-0.50 wt % of silicon, 0.03 wt % or less (0% exclusive) of phosphorus, 0.01 wt % or less (0% exclusive) of sulfur, 0.050 wt % or less (0% exclusive) of aluminum, 5 wt % or less (0% inclusive) of chromium, 0.01 wt % or less (0% inclusive) of boron, 0.1 wt % or less (0% exclusive) of nitrogen, and a balance amount of Fe and inevitable impurities, has an index of sensitivity of 3.4 or less, the index of sensitivity being represented by the following relational expression (1): [Relational expression 1]—0.451+34.131*P+111.152*Al?799.483*B+0.526*Cr?3.4 (wherein [P], [Al], [B] and [Cr] each mean a wt % of corresponding elements), and contains a microstructure with austenite at an area fraction of 95% or greater therein.
    Type: Grant
    Filed: December 23, 2016
    Date of Patent: March 30, 2021
    Assignee: POSCO
    Inventors: Un-Hae Lee, Sung-Kyu Kim, Soon-Gi Lee, Yong-Jin Kim, Hong-Yeol Oh
  • Patent number: 10876184
    Abstract: A process for making a hot rolled high strength steel (HRHSS) product including the steps of casting a steel slab having, in weight percent, C: 0.18-0.22, Mn: 1.0-2.0, Si: 0.8-1.2, Cr: 0.8-1.2, S: 0.008 max, P: 0.025 max, Al: 0.01-0.15, N: 0.005 max, Nb: 0.02-0.035, Mo: 0.08-0.12, the remainder iron (Fe) and incidental impurities, hot rolling the steel slab into strip at a finish rolling temperature (FRT) of 850-900° C., cooling the hot rolled strip at 40° C./s or more over a run out table (ROT) until the strip reaches 380-400° C., coiling the hot rolled strip, and then air cooling to room temperature.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: December 29, 2020
    Assignee: Tata Steel Limited
    Inventors: Appa Rao Chintha, Monideepa Mukherjee, Prashant Pathak, Tapas Chanda, Gyanaranjan Mishra
  • Patent number: 10676138
    Abstract: A vehicle underbody structure containing a floor panel, at least one longitudinal beam extending in a longitudinal direction of the vehicle under said floor panel and at least one lowerside sill part extending in the longitudinal direction adjacent to the floor panel, and at least one reinforcement element extending in a transversal direction, substantially perpendicular to the longitudinal direction, said reinforcement element made of a press hardened steel part having a tensile strength higher or equal to 1200 MPa and extending under the floor panel and being attached at one of its transversal ends to the longitudinal beam and at the other of its transversal ends to the lowerside sill part is provided. A vehicle body including the vehicle underbody structure is also provided.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: June 9, 2020
    Assignee: ARCELORMITTAL
    Inventors: Ivan Viaux, Florin Arnautu
  • Patent number: 10519523
    Abstract: An infrared heating method comprises: wholly infrared heating a steel sheet uniformly up to a temperature which is A3 point or above; and temperature distribution controlling, wherein, after the wholly infrared heating, partial lowering of a light intensity of infrared rays irradiated toward the steel sheet is performed to provide a first region having a temperature of A3 point or above and a second region having a temperature less than A1 point in the steel sheet.
    Type: Grant
    Filed: January 30, 2014
    Date of Patent: December 31, 2019
    Assignee: AISIN TAKAOKA CO., LTD.
    Inventor: Ryozo Wada
  • Patent number: 10354784
    Abstract: A non-oriented magnetic steel sheet includes a specific chemical composition represented by, in mass %: Si: 3.0% to 3.6%; Al: 0.50% to 1.25%; Mn: 0.5% to 1.5%; Sb or Sn or both of them: [Sb]+[Sn]/2 is 0.0025% to 0.05% where [Sb] denotes an Sb content and [Sn] denotes an Sn content; P: 0.010% to 0.150%; Ni: 0.010% to 0.200%; C: 0.0010% to 0.0040%; and others. The thickness of the non-oriented magnetic steel sheet is 0.15 mm to 0.30 mm. the non-oriented magnetic steel sheet includes magnetic properties represented by, where t denotes a thickness (mm) of the non-oriented magnetic steel sheet: a magnetic flux density B50: “0.2×t+1.52” T or more; a magnetic flux density difference ?B50: 0.08 T or less; core loss W10/50: 0.95 W/kg or less; and core loss W10/400: “20×t+7.5” W/kg or less. A ratio of a number of intergranular carbides precipitated in grains relative to a sum of the number of the intergranular carbides and a number of grain boundary carbides precipitated on grain boundaries is 0.50 or less.
    Type: Grant
    Filed: July 2, 2015
    Date of Patent: July 16, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kenichi Murakami, Yoshiaki Natori, Takuya Matsumoto, Hiroki Hori, Takeaki Wakisaka
  • Patent number: 10287650
    Abstract: The invention relates to a furnace system and a method for the controlled heat treatment of sheet metal components in individual component zones. The invention proposes a furnace system that is suitable for partly heating components made of steel sheet to a temperature above the AC3 temperature. The furnace system has a production furnace for heating the steel sheet parts to a temperature that is close to but below the AC3 temperature, said furnace system further having a profiling furnace with at least one level. The at least one level has an upper and lower part and a product-specific intermediate flange that is introduced into a corresponding receiving area. The product-specific intermediate flange is designed to impose a specified temperature profile on the component with temperatures over AC3 for regions to be hardened and below AC3 for softer regions. Furthermore, the invention relates to a corresponding method for partly heating steel sheet parts to a temperature above the AC3 temperature.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: May 14, 2019
    Assignee: SCHWARTZ GMBH
    Inventor: Rolf-Josef Schwartz
  • Patent number: 10227683
    Abstract: The present invention relates to high strength cold rolled steel sheet suitable for applications in automobiles, construction materials and the like, specifically high strength steel excellent in formability. In particular, the invention relates to cold rolled steel sheets having a tensile strength of at least 780 MPa.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: March 12, 2019
    Assignee: VOESTALPINE STAHL GMBH
    Inventors: Thomas Hebesberger, Daniel Krizan, Stefan Paul, Andreas Pichler
  • Patent number: 10202664
    Abstract: The present invention relates to high strength cold rolled steel sheet suitable for applications in automobiles, construction materials and the like, specifically high strength steel excellent in formability. In particular, the invention relates to cold rolled steel sheets having a tensile strength of at least 980 MPa and a method for producing such steel sheet.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: February 12, 2019
    Assignees: VOESTALPINE STAHL GMBH, KOBE STEEL, LTD
    Inventors: Daniel Krizan, Stefan Paul, Andreas Pichler, Michiharu Nakaya
  • Patent number: 10106874
    Abstract: The present invention relates to high strength cold rolled steel sheet suitable for applications in automobiles, construction materials and the like, specifically high strength steel sheet excellent in formability. In particular, the invention relates to cold rolled steel sheets having a tensile strength of at least 980 MPa and a method for producing such steel sheet.
    Type: Grant
    Filed: April 2, 2013
    Date of Patent: October 23, 2018
    Assignees: VOESTALPINE STAHL GMBH, KOBE STEEL LTD
    Inventors: Stefan Paul, Daniel Krizan, Andreas Pichler, Michiharu Nakaya
  • Patent number: 10023928
    Abstract: A 700 Mpa-level high-strength hot rolling Q&P steel and the method of manufacturing the same, which steel has the chemical compositions in weight percentage as follows: C: 0.15%˜0.40%; Si: 1.0%˜2.0%; Mn: 1.5%˜3.0%; P: less than or equal to 0.015%; S: less than or equal to 0.005%; Al: 0.3%˜1.0%; N: less than or equal to 0.006%; Ti: 0.005%˜0.015%, the remainders being Fe; it having a yield strength of more than or equal to 700 Mpa, a tensile strength of more than or equal to 1300 Mpa and an elongation rate of more than 10%.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: July 17, 2018
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Huanrong Wang, Zigang Li, Wei Wang, Jiansu Zhang, Jianye Li
  • Patent number: 9987669
    Abstract: A method for manufacturing thin strip continuously cast 700 Mpa grade high strength weather-resistant steel, the method comprising the following steps: 1) casting a 1-5 mm thick cast strip in a double roller continuous casting machine, the cast strip comprising the following chemical compositions by weight percent: C 0.03-0.1%, Si?0.4%, Mn 0.75-2.0%, P 0.07-0.22%, S?0.01%, N?0.012%, and Cu 0.25-0.8%, further comprising more than one of Nb, V, Ti and Mo: Nb 0.01-0.1%, V 0.01-0.1%, Ti 0.01-0.1%, and Mo 0.1-0.5%, and the balance being Fe and unavoidable impurities; 2) cooling the cast strip at a rate greater than 20° C./s; 3) hot rolling the cast strip under a temperature of 1050-1250° C. at a reduction rate of 20-50% and a deformation rate greater than 20 s?1; then conducting austenite online recrystallization, the thickness of the hot rolled strip being 0.5-3.0 mm; 4) cooling at a rate of 10-80° C./s; and 5) rolling up under a temperature of 500-650° C.
    Type: Grant
    Filed: February 18, 2013
    Date of Patent: June 5, 2018
    Assignee: BAOSHAN IRON & STEEL CO., LTD.
    Inventors: Yuan Fang, Xiufang Wang, Yan Yu, Jianchun Wu, Feng Zhang, Wei He
  • Patent number: 9149868
    Abstract: A steel product or thin steel cast strip comprised of, by weight, less than 0.25% carbon, between 0.20 and 2.0% manganese, between 0.05 and 0.50% silicon, less than 0.01% aluminum, and at least one of niobium between 0.01% and 0.20% and vanadium between 0.01% and 0.20%, and having a microstructure of a majority bainite and acicular ferrite, and more than 70% niobium and/or vanadium in solid solution. The steel product may have an increase in elongation and an increase in yield strength after age hardening. The age hardened steel product may have niobium carbonitride particles with an average particle size of 10 nanometers and less, and may have substantially no niobium carbonitride particles greater than 50 nanometers. The steel product may have a yield strength of at least 380 MPa or a tensile strength of at least 410 MPa, or both. The steel product or thin cast steel strip may have a total elongation of at least 6% or 10%.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: October 6, 2015
    Assignee: Nucor Corporation
    Inventors: James Geoffery Williams, Harold Roland Kaul, Daniel Geoffrey Edelman, Christopher Ronald Killmore
  • Publication number: 20150101714
    Abstract: This disclosure deals with a class of metal alloys with advanced property combinations applicable to metallic sheet production. More specifically, the present application identifies the formation of metal alloys of relatively high strength and ductility and the use of one or more cycles of elevated temperature treatment and cold deformation to produce metallic sheet at reduced thickness with relatively high strength and ductility.
    Type: Application
    Filed: December 18, 2014
    Publication date: April 16, 2015
    Inventors: Daniel James BRANAGAN, Grant G. JUSTICE, Andrew T. BALL, Jason K. WALLESER, Brian E. MEACHAM, Kurtis CLARK, Longzhou MA, Igor YAKUBTSOV, Scott Larish, Sheng CHENG, Taylor L. GIDDENS, Andrew E. FRERICHS, Alla V. SERGUEEVA
  • Patent number: 8999085
    Abstract: A high-ductility, high-strength and high Mn steel strip used for steel strips of automobiles requiring superior formability and high strength, a plated steel strip produced by using the same, and a manufacturing method thereof are disclosed. The high Mn steel strip comprises, by weight %, 0.2˜1.5% of C, 10˜25% of Mn, 0.01˜3.0% of Al, 0.005˜2.0% of Si, 0.03% or less of P, 0.03% or less of S, 0.040% or less of N, and the balance of Fe and other unavoidable impurities. The high-ductility, high-strength and high Mn steel strip, and the plated steel strip produced by using the same have superior surface properties and plating characteristics.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: April 7, 2015
    Assignee: Posco
    Inventors: Seong-Ju Kim, Kwang-Geun Chin, Hyun-Gyu Hwang, Sung-Kyu Kim, Il-Ryoung Sohn, Young-Kook Lee, Oh-Yeon Lee
  • Publication number: 20150090372
    Abstract: This disclosure deals with a class of metal alloys with advanced property combinations applicable to metallic sheet production. More specifically, the present application identifies the formation of metal alloys of relatively high strength and ductility and the use of one or more cycles of elevated temperature treatment and cold deformation to produce metallic sheet at reduced thickness with relatively high strength and ductility.
    Type: Application
    Filed: October 2, 2014
    Publication date: April 2, 2015
    Inventors: Daniel James BRANAGAN, Grant G. JUSTICE, Andrew T. BALL, Jason K. WALLESER, Brian E. MEACHAM, Kurtis CLARK, Longzhou MA, Igor YAKUBTSOV, Scott Larish, Sheng CHENG, Taylor L. GIDDENS, Andrew E. FRERICHS, Alla V. SERGUEEVA
  • Publication number: 20150047752
    Abstract: A high strength interstitial free low density steel and method for producing the steel.
    Type: Application
    Filed: April 10, 2013
    Publication date: February 19, 2015
    Applicant: TATA STEEL NEDERLAND TECHNOLOGY B.V.
    Inventors: Cheng Liu, Radhakanta Rana
  • Publication number: 20150041026
    Abstract: A method is provided with which a bearing steel, even when obtained from an ingot, is made to have a segregation part reduced in the degree of segregation and maximum inclusion diameter. The ingot contains 0.56-0.70 mass % C, 0.15-0.50 mass %, excluding 0.50 mass %, Si, 0.60-1.50 mass % Mn, 0.50-1.10 mass % Cr, 0.05-0.5 mass % Mo, up to 0.025 mass % P, up to 0.025 mass % S, 0.005-0.500 mass % Al, up to 0.0015 mass % O, and 0.0030-0.015 mass % N, with the remainder comprising Fe and incidental impurities. The ingot has a degree of segregation of 2.8 or less and a predicted value of the maximum diameter of inclusions present in 30,000 mm2 of the ingot, as calculated by extreme value statistics, of 60 ?m or less.
    Type: Application
    Filed: September 27, 2012
    Publication date: February 12, 2015
    Applicants: JFE STEEL CORPORATION, NTN CORPORATION
    Inventors: Minoru Honjo, Kiyoshi Uwai, Shinji Mitao
  • Publication number: 20150013853
    Abstract: A hot-rolled steel sheet for a generator rim contains a structure containing a ferrite phase with an areal ratio of 95% or more in which precipitates containing Ti and V whose average grain diameter is less than 10 nm are precipitated in crystal grains of the ferrite phase. The ferrite phase has an average crystal grain diameter within the range of 2 ?m or more and less than 10 ?m. The hot-rolled steel sheet for a generator rim has strength with a yield strength YS in a rolling direction of 700 MPa or more and electromagnetic properties with a magnetic flux density B50 of 1.5 T or more and a magnetic flux density B100 of 1.6 T or more.
    Type: Application
    Filed: January 30, 2013
    Publication date: January 15, 2015
    Applicant: JFE STEEL CORPORATION
    Inventors: Nobuyuki Nakamura, Katsumi Nakajime, Yoshimasa Funakawa, Kazutaka Okimoto, Takahiko Ogura
  • Patent number: 8858739
    Abstract: A method and system of forming a micro-wire including heating metal feedstock to a liquid state within a glass tube, wherein the metal feedstock includes an iron based glass forming alloy comprising one or more of nickel and cobalt present in the range of 7 atomic percent to 50 atomic percent and one or more of boron, carbon, silicon, phosphorous and nitrogen present in the range of 1 to 35 atomic percent. Negative pressure may be provided to the interior the glass tube and the glass tube containing the metal feedstock may be drawn down. The metal feedstock in the glass tube may be cooled at a rate sufficient to form a wire exhibiting crystalline microstructures present in the range of 2 to 90 percent by volume in a glass matrix.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: October 14, 2014
    Assignee: The NanoSteel Company, Inc.
    Inventors: Daniel James Branagan, Alla V. Sergueeva, Jikou Zhou, James N. Milloway
  • Publication number: 20140261906
    Abstract: A bearing steel includes, as a metallographic structure, inclusions which contain complex oxysulfides including Rare Earth Metal, Ca, O, S, and Al, TiN, MnS, Al2O3, and complex oxides including Al and Ca, wherein, a number fraction of the complex oxysulfides in a total number of the inclusions is 50% to less than 100% and a number of complex oxysulfides having a major axis of 5 ?m or more is 0.001 pieces to 2 pieces in an observed section of 1 mm2, and a number of TiN existing independently from the complex oxysulfides and having a major axis of 5 ?m or more is 0.001 pieces to less than 1.0 piece in an observed section of 1 mm2.
    Type: Application
    Filed: October 5, 2012
    Publication date: September 18, 2014
    Inventors: Masayuki Hashimura, Masafumi Miyazaki, Hideaki Yamamura, Takahisa Suzuki, Takashi Fujita
  • Publication number: 20140230970
    Abstract: The invention relates principally to a hot rolled steel sheet with a yield stress greater than 690 MPa and less than or equal to 840 MPa, with strength between 780 MPa and 950 MPa, elongation at failure greater than 10% and a hole expansion ratio (Ac) greater than or equal to 50%. The chemical composition of the sheet claimed by the invention contains, whereby the contents are expressed in percent by weight: 0.40%?C?0.065%, 1.4%?Mn?1.9%, 0.1%?Si?0.55%, 0.095%?Ti?0.145%, 0.025%?Nb?0.045%, 0.005%?Al?0.1%, 0.002%?N?0.007%, S?0.004%, P<0.020. The microstructure of the sheet claimed by the invention also consists of granular bainite, ferrite, cementite in an area percentage of less than 1.5% and titanium and niobium carbonitrides, which results in a hole expansion ratio (Ac) greater than or equal to 50%, and the ratio between the grain size DL measured parallel to the rolling direction and the grain size DN measured perpendicular to the rolling direction is less than or equal to 1.4.
    Type: Application
    Filed: March 23, 2012
    Publication date: August 21, 2014
    Applicant: ARCELORMITTAL INVESTIGACION Y DESARROLL SL
    Inventors: Astrid Perlade, Aurelie Milami, Florence Pechenot, Erik Stenback, Jean Marc Pipard, Farid E. Hassani
  • Patent number: 8795449
    Abstract: The present invention relates to a Fe—Ga—Al-based magnetostrictive thin-sheet material and a process for preparation thereof. The raw materials used for production of the thin-sheet material is composed of the components according to the general Formula, Fe100-x-y-zGaxAlyMz, wherein x=10-30, y=1-10, and z=0.1-5, and M is any one, or more elements selected from V, Cr, Zr, Sb, Sn, Ti, SiC.
    Type: Grant
    Filed: February 18, 2011
    Date of Patent: August 5, 2014
    Assignee: Beijing Magoriental Materials Technology Co., Ltd.
    Inventors: Xuexu Gao, Jiheng Li, Maocai Zhang, Jie Zhu, Lina Dong
  • Publication number: 20140190594
    Abstract: The present disclosure is directed and formulations and methods to provide alloys having relative high strength and ductility. The alloys may be provided in seamless tubular form and characterized by their particular alloy chemistries and identifiable crystalline grain size morphology. The alloys are such that they include boride pinning phases. In what is termed a Class 1 Steel the alloys indicate tensile strengths of 700 MPa to 1400 MPa and elongations of 10-70%. Class 2 Steel indicates tensile strengths of 800 MPa to 1800 MPa and elongations of 5-65%. Class 3 Steel indicates tensile strengths of 1000 MPa to 2000 MPa and elongations of 0.5-15%.
    Type: Application
    Filed: January 9, 2014
    Publication date: July 10, 2014
    Inventors: Daniel James BRANAGAN, Sheng CHENG, Longzhou MA, Jason K. WALLESER, Grant G. JUSTICE, Andrew T. BALL, Kurtis CLARK, Scott LARISH, Alissa PETERSON, Patrick E. MACK, Brian D. MERKLE, Brian E. MEACHAM, Alla V. SERGUEEVA
  • Patent number: 8764918
    Abstract: The present invention provides high strength steel pipe for line pipe superior in low temperature toughness suppressed in drop of toughness of the HAZ and a method of production of the same, more particularly high strength steel plate for line pipe used as a material for high strength steel pipe for line pipe and a method of production of the same, in particular high strength steel pipe for line pipe superior in low temperature toughness characterized in that the chemical compositions of the base metal is, by mass %, C: 0.020 to 0.080%, Si: 0.01 to 0.50%, Mo: 0.01 to 0.15%, Al: 0.0005 to 0.030%, and Nb: 0.0001 to 0.030% contained in a range of C+0.25Si+0.1Mo+Al+Nb: 0.100% or less and the mixture of austenite and martensite present along prior austenite grain boundaries of the reheated part of the heat affected zone has a width of 10 ?m or less and a length of 50 ?m or less.
    Type: Grant
    Filed: July 2, 2007
    Date of Patent: July 1, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Takuya Hara, Hitoshi Asahi, Yoshio Terada
  • Publication number: 20140170439
    Abstract: The present invention provides a cold rolled steel sheet. The steel sheet has a strength greater than 1000 MPa, a uniform elongation greater than 12% and a V-bendability greater than 90°. The composition of the steel sheet includes, expressed in per cent by weight, 0.15%?C?0.25%, 1.8%?Mn?3.0%, 1.2%?Si?2%, 0%?Al?0.10%, 0%?Cr?0.50%, 0%?Cu?1%, 0%?Ni?1%, 0%?S?0.005%, 0%?P?0.020%, Nb?0.015%, Ti?0.020%, V?0.015%, Co?1%, N?0.008%, B?0.001% whereby Mn+Ni+Cu?3%. The remainder of the composition consists of iron and inevitable impurities resulting from processing. The microstructure includes, in area percentage, 5 to 20% polygonal ferrite, 10 to 15% residual austenite, 5 to 15% martensite and a balance of bainite. The bainite is in the form of laths and includes carbides between the laths. A number N of inter-lath carbides larger than 0.1 micrometers per unit of surface area is less than or equal to 50000/mm2. A fabrication method and a motor vehicle are also provided.
    Type: Application
    Filed: May 3, 2012
    Publication date: June 19, 2014
    Inventors: Sebastien Allain, Jan Mahieu, Mickael Denis Crouvizier, Thierry Mastrorillo, Arnaud Hennion
  • Publication number: 20140130943
    Abstract: A method of making a high strength head-hardened crane rail and the crane rail produced by the method. The method comprises the steps of providing a steel rail having a composition comprising, in weight percent: C, 0.79-1.00%; Mn, 0.40-1.00; Si, 0.30-1.00; Cr, 0.20-1.00; V, 0.05-0.35; Ti, 0.01-0.035; N, 0.002 to 0.0150; and the remainder being predominantly iron. The steel rail is cooled from a temperature between about 700 and 800° C. at a cooling rate having an upper cooling rate boundary plot defined by an upper line connecting xy-coordinates (0 s, 800° C.), (40 s, 700° C.), and (140 s, 600° C.) and a lower cooling rate boundary plot defined by a lower line connecting xy-coordinates (0 s, 700° C.), (40 s, 600° C.), and (140 s, 500° C.).
    Type: Application
    Filed: November 15, 2013
    Publication date: May 15, 2014
    Inventors: Bruce L. Bramfitt, Frederick B. Fletcher, Jason T McCullough, Michael A. Muscarella, John S. Nelson
  • Publication number: 20140116578
    Abstract: The present invention relates to a high-strength high-toughness steel plate and a method of manufacturing the steel plate. The steel plate contains the following chemical compositions, by weight, C: 0.03-0.06%, Si?0.30%, Mn: 1.0-1.5%, P?0.020%, S?0.010%, Al: 0.02-0.05%, Ti: 0.005-0.025%, N?0.006%, Ca?0.005%, and more than one of Cr?0.75%, Ni?0.40%, Mo?0.30%, other compositions being Ferrum and unavoidable impurities.The finished steel plate, with a thickness of 6-25 mm, has a yield strength of ?700 MPa, an elongation A50 of ?18%, Akv at ?60° C. of ?150 J and good cool bending property.
    Type: Application
    Filed: May 25, 2012
    Publication date: May 1, 2014
    Applicant: Baoshan Iron & Steel Co., Ltd.
    Inventors: Aiwen Zhang, Sihai Jiao, Qingfeng Zhang
  • Publication number: 20140102600
    Abstract: The invention relates to a bainite steel consisting of the following elements in weight %: C: 0.25-0.55 Si: 0.5-1.8 Mn: 0.8-3.8 Cr: 0.2-2.0 Ti: 0.0-0.1 Cu: 0.0-1.2 V: 0.0-0.5 Nb: 0.0-0.06 Al: 0.0-2.75 N: <0.004 P: <0.025 S: <0.025 and a method for manufacturing a bainite steel strip that comprises the step of cooling the coiled strip of such composition to ambient temperature, during which the bainite transformation takes place.
    Type: Application
    Filed: May 28, 2012
    Publication date: April 17, 2014
    Applicant: TATA STEEL LIMITED
    Inventors: Das Sourav, Kundu Saurabh, Halder Arunansu
  • Patent number: 8673094
    Abstract: A case hardening steel includes by mass %, C: 0.1% to 0.5%, Si: 0.01% to 1.5%, Mn: 0.3% to 1.8%, S: 0.001% to 0.15%, Cr: 0.4% to 2.0%, Ti: 0.05% to 0.2%, Al: limited to 0.2% or less, N: limited to 0.0050% or less, P: limited to 0.025% or less, O: limited to 0.0025% or less, and the balance of Fe and inevitable impurities, wherein the number d of sulfide having an equivalent circle diameter more than 5 ?m per 1 mm2 and a mass percentage [S] of S satisfy: d?500×[S]+1.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: March 18, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Masayuki Hashimura, Kei Miyanishi, Shuji Kozawa, Manabu Kubota, Tatsuro Ochi
  • Patent number: 8668784
    Abstract: A steel for a welded structure includes the following composition: by mass %, C at a C content [C] of 0.015 to 0.045%; Si at a Si content [Si] of 0.05 to 0.20%; Mn at a Mn content [Mn] of 1.5 to 2.0%; Ni at a Ni content [Ni] of 0.10 to 1.50%; Ti at a Ti content [Ti] of 0.005 to 0.015%; O at an O content [O] of 0.0015 to 0.0035%; and N at a N content [N] of 0.002 to 0.006%, and a balance composed of Fe and unavoidable impurities. In the steel for a welded structure, the P content [P] is limited to 0.008% or less, the S content [S] is limited to 0.005% or less, the Al content [Al] is limited to 0.004% or less, the Nb content [Nb] is limited to 0.005% or less, the Cu content [Cu] is limited to 0.24% or less, the V content [V] is limited to 0.020% or less, and a steel composition parameter PCTOD is 0.065% or less, and a steel composition hardness parameter CeqH is 0.235% or less.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: March 11, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Yoshiyuki Watanabe, Kazuhiro Fukunaga, Akihiko Kojima, Ryuji Uemori, Rikio Chijiiwa
  • Publication number: 20140041767
    Abstract: A hot-rolled flat steel product having a tensile strength of at least 1100 MPa, good elongation properties, and good deformation properties. The flat steel product is produced from a complex phase steel, which contains, in addition to iron and inevitable impurities (in % by weight), C: 0.13-0.2%, Mn: 1.8-2.5%, Si: 0.70-1.3%, Al: 0.01 to 0.1%, P: up to 0.1%, S: up to 0.01%, Cr: 0.25-0.70%, optionally Mo, the total of the Cr and Mo contents being 0.25-0.7%, Ti: 0.08-0.2%, B: 0.0005-0.005%, and a structure which consists of at the most 10% by volume of residual austenite, 10-60% by volume of martensite, at the most 30% by volume of ferrite and at least 10% by volume of bainite. Also, a method for producing such a flat steel product.
    Type: Application
    Filed: December 29, 2011
    Publication date: February 13, 2014
    Applicant: THYSSENKRUPP STEEL EUROPE AG
    Inventors: Brigitte Hammer, Jörg Mertens, Günter Stich
  • Patent number: 8641836
    Abstract: The present invention provides steel plate for line pipe excellent in strength and ductility and a method of production of the same. The steel plate has a steel composition containing, by mass %, C: 0.04 to 0.15%, Si: 0.05 to 0.60%, Mn: 0.80 to 1.80%, P: 0.020% or less, S: 0.010% or less, Nb: 0.01 to 0.08%, and Al: 0.003 to 0.08%, having a balance of iron and unavoidable impurities, and having a value of Ceq shown by the following formula <1> of 0.48 or less, comprised of a mixed structure of ferrite and pearlite or ferrite and pearlite partially containing bainite in which a ferrite percentage is 60 to 95%, having a yield strength of 450 MPa or more, and having an amount of hydrogen contained in the steel of 0.1 ppm or less: Ceq=C+Mn/6+(Cu+Ni)/15+(Cr+Mo+Nb+V+Ti)/5+5B??<1>.
    Type: Grant
    Filed: October 28, 2009
    Date of Patent: February 4, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Hajime Ishikawa, Ryuji Uemori, Yoshiyuki Watanabe, Nobuhiko Mamada
  • Publication number: 20140007992
    Abstract: A method for generating a flat steel product comprising the steps of: melting a steel melt, comprising, in addition to Fe and unavoidable impurities (in wt %) C: 0.5-1.3%, Mn: 18-26%, Al: 5.9-11.5%, Si: <1%, Cr: <8%, Ni: <3%, Mo: <2%, N: <0.1%, B: <0.1%, Cu: <5%, Nb: <1%, Ti: <1%, V: <1%, Ca: <0.05%, Zr: <0.1%, P: <0.04%, S: <0.04%; casting the steel melt into a cast strip; heating the cast strip to an initial hot-rolling temperature of 1100-1300° C. at a heating rate of at least 20 K/s; hot rolling the cast strip into a hot strip; cooling the hot strip within 10 seconds after the hot rolling at a cooling rate of at least 100 K/s to <400° C.; and winding the cooled hot strip into a coil at a coiling temperature of up to 400° C.
    Type: Application
    Filed: December 14, 2011
    Publication date: January 9, 2014
    Applicant: THYSSENKRUPP STEEL EUROPE AG
    Inventors: Evgeny Balichev, Jian Bian, Harald Hofmann
  • Patent number: 8623154
    Abstract: 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: Grant
    Filed: October 27, 2011
    Date of Patent: January 7, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Ryuichi Honma, Ryuji Uemori, Tadashi Ishikawa, Akihiko Kojima, Manabu Hoshino
  • Publication number: 20140000767
    Abstract: A steel wire rod which is a material of steel wires includes, as a metallographic structure, by area %, 95% to 100% of a pearlite, wherein an average pearlite block size at a central portion of the steel wire rod is 1 ?m to 25 ?m, an average pearlite block size at a surface layer portion of the steel wire rod is 1 ?m to 20 ?m, and, when a minimum lamellar spacing of the pearlite at the central portion of the steel wire rod is S in unit of nm and when a distance from a peripheral surface of the steel wire rod to a center is r in unit of mm, S<12 r+65 is satisfied.
    Type: Application
    Filed: March 13, 2012
    Publication date: January 2, 2014
    Inventors: Shingo Yamasaki, Toshiyuki Manabe, Naoshi Hikita
  • Publication number: 20130299049
    Abstract: A method for manufacturing a grain-oriented silicon steel having excellent magnetic performance, comprising steps as follows 1)conventionally melting and casting into a steel blank; 2) heating the steel blank and hot rolling the same into a strip of steel; 3)normalizing process; carrying out the normalizing process having two stages, wherein the strip is firstly heated to 1100˜1200° C., then cooled to 900˜1000° C. within 50˜200 s; and next, the strip is rapidly cooled in water having a temperature of 10-100; in this period, a tension force is applied to the strip of steel, the strip of steel in the temperature range of 900 ° C.˜500° C. has a stress of 1˜200N/mm2; 4)cold rolling, i.e. carrying out a primary cold rolling, or a double cold rolling with intermediate annealing; 5)carrying out primary recrystallizing annealing, then coating an annealing separator, whose main composition is MgO, to carry out final product annealing comprising secondary recrystallizing annealing and purifying annealing.
    Type: Application
    Filed: April 28, 2011
    Publication date: November 14, 2013
    Inventors: Meihong Wu, Weizhong Jin, Huande Sun, Guohua Yang, Kanyi Shen, Jie Huang, Deyang Hu, Guobao Li
  • Publication number: 20130279971
    Abstract: 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: Application
    Filed: October 27, 2011
    Publication date: October 24, 2013
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Ryuichi Honma, Ryuji Uemori, Tadashi Ishikawa, Akihiko Kojima, Manabu Hoshino
  • Patent number: 8562766
    Abstract: A thin cast strip is formed having at least one microstructure selected from the group consisting of polygonal ferrite, acicular ferrite, Widmanstatten, bainite and martinsite, a surface roughness of less than 1.5 microns Ra and a scale thickness of less than about 10 microns by applying a mixture of water and oil on the work rolls of the hot rolling mill, passing the thin cast strip at a temperature of less than 1100° C. through the hot rolling mill while the mixture of oil and water is applied to the work rolls, and shrouding the thin cast strip from the casting rolls through the hot rolling mill in an atmosphere of less than 5% oxygen to form the thin cast strip.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: October 22, 2013
    Assignee: Nucor Corporation
    Inventors: Walter N. Blejde, Jay Jon Ondrovic
  • Publication number: 20130174942
    Abstract: The invention relates to a steel plate, the chemical composition of which comprises, the contents being expressed by weight: 0.010%?C?0.20%, 0.06%?Mn?3%, Si?1.5%, 0.005%?Al?1.5%, S?0.030%, P?0.040%, 2.5%?Ti?7.2%, (0.45×Ti)?0.35%?B?(0.45×Ti)+0.70%, and optionally one or more elements chosen from: Ni?1%, Mo?1%, Cr?3%, Nb?0.1%, V?0.1%, the balance of the composition consisting of iron and inevitable impurities resulting from the smelting.
    Type: Application
    Filed: June 25, 2010
    Publication date: July 11, 2013
    Applicant: ArcelorMittal France
    Inventors: Frederic BONNET, Olivier BOUAZIZ, Laure CALA
  • Publication number: 20130174943
    Abstract: A case hardened steel with excellent cold forgeability and excellent impact properties after case hardening processing contains C, Si, Mn, S, Cr, Al, Ti, Nb, B, and N, with the balance being iron and unavoidable impurities. Of precipitates containing Ti and/or Nb, precipitates having a size of not less than 20 ?m2 are at a number density of not more than 1.0/mm2. Of precipitates containing Ti and/or Nb, precipitates having a size of more than 5 ?m2 and less than 20 ?m2 and containing Mn and S are at a number density of more than 0.7/mm2 and not more than 3.0/mm2. The ferrite fraction is more than 77% by area.
    Type: Application
    Filed: August 10, 2011
    Publication date: July 11, 2013
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
    Inventors: Nariaki Okamoto, Mutsuhisa Nagahama
  • Publication number: 20130146180
    Abstract: A steel for a carburizing and a carburized steel component having a steel portion and a carburized layer with a thickness of more than 0.4 mm to less than 2 mm which is formed on an outside of the steel portion. A chemical composition of the steel for the carburizing and the steel portion of the carburized steel component satisfies simultaneously equations of a hardness parameter, a hardenability parameter, and a TiC precipitation parameter.
    Type: Application
    Filed: February 8, 2012
    Publication date: June 13, 2013
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Manabu Kubota
  • Publication number: 20130146181
    Abstract: A steel for a carburizing and a carburized steel component having a steel portion and a carburized layer with a thickness of more than 0.4 mm to less than 2 mm which is formed on an outside of the steel portion. A chemical composition of the steel for the carburizing and the steel portion of the carburized steel component satisfies simultaneously equations of a hardness parameter, a hardenability parameter, and an AlN precipitation parameter.
    Type: Application
    Filed: February 8, 2012
    Publication date: June 13, 2013
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Manabu Kubota
  • Publication number: 20130118647
    Abstract: A method of producing an austenitic steel strip or sheet excellent in resistance to delayed cracking and a steel produced thereby.
    Type: Application
    Filed: June 10, 2011
    Publication date: May 16, 2013
    Applicant: TATA STEEL IJMUIDEN BV
    Inventors: Basjan Berkhout, Marcus Cornelis Maria Cornelissen, Jayesh Ramjibhai Patel
  • Publication number: 20130048156
    Abstract: A case hardening steel includes by mass %, C: 0.1% to 0.5%, Si: 0.01% to 1.5%, Mn: 0.3% to 1.8%, S: 0.001% to 0.15%, Cr: 0.4% to 2.0%, Ti: 0.05% to 0.2%, Al: limited to 0.2% or less, N: limited to 0.0050% or less, P: limited to 0.025% or less, O: limited to 0.0025% or less, and the balance of Fe and inevitable impurities, wherein the number d of sulfide having an equivalent circle diameter more than 5 ?m per 1 mm2 and a mass percentage [S] of S satisfy: d 500×[S]+1.
    Type: Application
    Filed: October 5, 2011
    Publication date: February 28, 2013
    Inventors: Masayuki Hashimura, Kei Miyanishi, Shuji Kozawa, Manabu Kubota, Tatsuro Ochi
  • Patent number: 8377235
    Abstract: The invention refers to a process for forming a steel component, incorporating the steps of—providing a blank having substantially the volume of the component to be formed,—heating the blank to a semi solid state with a specific liquid fraction,—forming the blank with a forging technique to a component of near net shape dimensions,—subjecting the formed, near net shape component, to a normalization combined with a hardening,—subjecting the normalized and hardened near net shape component to machining to give the component net shape.
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: February 19, 2013
    Assignee: Aktiebolaget SKF
    Inventors: Patrick Dahlman, Martin Friis, Henrik Karlsson
  • Patent number: 8361254
    Abstract: Maraging steel compositions, methods of forming the same, and articles formed therefrom comprising, by weight, 15.0 to 20.0% Ni, 2.0 to 6.0% Mo, 3.0 to 8.0% Ti, up to 0.5% Al, the balance Fe and residual impurities. The composition may be a first layer of a composite plate, and may have a second layer deposited on the first layer, the second layer having a composition comprising, by weight, 15.0 to 20.0% Ni, 2.0 to 6.0% Mo, 1.0 to 3.0 Ti, up to 0.5% Al, the balance Fe and residual impurities. The first layer may have a hardness value ranging from 58 to 64 RC, and the second layer may have a hardness value ranging from 48 to 54 RC. The first layer may be formed employing powdered metallurgical techniques. Articles formed from the compositions include armored plate.
    Type: Grant
    Filed: June 8, 2011
    Date of Patent: January 29, 2013
    Assignee: ATI Properties, Inc.
    Inventors: Ronald E. Bailey, Thomas R. Parayil, Timothy M. Hackett, Tong C. Lee
  • Publication number: 20120298267
    Abstract: A non-oriented electrical steel has relative high magnetic induction and high intensity without increasing manufacturing difficulty. The weight percentage of the compositions of the electrical steel are as follows: C?0.0040%, Si is 2.50% to 4.00%, Al is 0.20% to 0.80%, Cr is 1.0 to 8.0%, Ni is 0.5 to 5.0%, Mn?0.50%, P?0.30%, S?0.0020%, N?0.0030%, Ti?0.0030%, Nb?0.010%, V?0.010%, C+S+N+Ti?0.010%, and a balance substantially being Fe and inevitable impurities.
    Type: Application
    Filed: June 25, 2012
    Publication date: November 29, 2012
    Inventors: Zhanyuan Hu, Bo Wang, Shishu Xie, Aihua Ma, Liang Zou, Zitao Wang, Yuhua Zhu
  • Publication number: 20120285584
    Abstract: A manufacture process of non-oriented silicon steel with high magnetic induction includes smelting and casting steel having a chemical composition by weight percent: Si 0.1˜1%, Al 0.005˜1.0%, C?0.004%, Mn=0.10˜1.50%, P?0.2%, S?0.005%, N?0.002, Nb+V+Ti?0.006%, and the rest is Fe. The steel is cast into a billet, which is heated and hot-rolled to 1150˜1200° C. into a plate at a finish-rolling temperature 830˜900° C. The plate is cooled to a temperature ?570° C. and cold-roll flattened at compression ratio 2˜5%. The flattened plate is normalized at temperature not below 950° C. for 30˜180s, and then pickled and cold-rolled into a sheet with thickness of the finished product. The sheet is finish-annealed quickly heating the sheet to 800˜1000° C. at temperature rise rate ?100° C./s, soaking the heated sheet for 5˜60s at the temperature, and then slowly cooling the sheet to 600˜750° C.
    Type: Application
    Filed: June 11, 2012
    Publication date: November 15, 2012
    Inventors: Zitao Wang, Bo Wang, Shishu Xie, Bingzhong Jin, Aihua Ma, Liang Zou, Yuhua Zhu, Zhanyuan Hu, Xiao Chen
  • Patent number: 8303734
    Abstract: The present invention provides a high strength thick steel material excellent in toughness and weldability reduced in amount of C and amount of N, containing suitable amounts of Si, Mn, Nb, Ti, B, and O, having contents of C and Nb satisfying C—Nb/7.74?0.004, having a density of Ti-containing oxides of a particle size of 0.05 to 10 ?m of 30 to 300/mm2, and having a density of Ti-containing oxides of a particle size over 10 ?m of 10/mm2 or less, produced by treating steel by preliminary deoxidation to adjust the dissolved oxygen to 0.005 to 0.015 mass %, then adding Ti and, furthermore, vacuum degassing the steel for 30 minutes or more, smelting it, then continuously casting it to produce a steel slab or billet, heating the steel slab or billet to 1100 to 1350° C., hot rolling the slab or billet to a thickness of 40 to 150 mm, then cooling it.
    Type: Grant
    Filed: September 26, 2008
    Date of Patent: November 6, 2012
    Assignee: Nippon Steel Corporation
    Inventors: Suguru Yoshida, Hiroshi Kita, Teruhisa Okumura, Hirokazu Sugiyama, Teruyuki Wakatsuki
  • Publication number: 20120222781
    Abstract: High strength steel plate with an ultimate tensile strength of 900 MPa or more which is excellent in hydrogen embrittlement resistance characterized in that, in the structure of the steel plate, (a) by volume fraction, ferrite is present in 10 to 50%, bainitic ferrite and/or bainite in 10 to 60%, and tempered martensite in 10 to 50%, and (b) iron-based carbides which contain Si or Si and Al in 0.1% or more are present in 4×108 (particles/mm3) or more.
    Type: Application
    Filed: November 30, 2010
    Publication date: September 6, 2012
    Inventors: Masafumi Azuma, Noriyuki Suzuki, Naoki Maruyama, Akinobu Murasato, Yasuharu Sakuma, Hiroyuki Kawata, Chisato Wakabayashi