Next To Fe-base Component (e.g., Galvanized) Patents (Class 428/659)
  • Patent number: 10889873
    Abstract: A high strength steel sheet mainly used as an automotive exterior panel material is provided. In detail, a complex-phase steel sheet having excellent formability and a method of manufacturing the same are provided. A steel sheet may have excellent strength and ductility, and a relatively low yield ratio and an excellent surface quality may be provided.
    Type: Grant
    Filed: March 7, 2017
    Date of Patent: January 12, 2021
    Assignee: POSCO
    Inventors: Yeon Sang An, Sang Ho Han
  • Patent number: 10822684
    Abstract: A hot-dip galvanized steel sheet includes a base steel sheet and a hot-dip galvanized layer formed on at least one surface of the base steel sheet, in which the hot-dip galvanized layer includes Fe in a content of more than 0% to 5% or less, Al in a content of more than 0% to 1.0% or less, and columnar grains formed by a ? phase on the surface of the steel sheet, further, 20% or more of the entire interface between the hot-dip galvanized layer and the base steel sheet is coated with the ? phase, and a ratio of an interface formed between ? grains in which coarse oxides are present among ? grains and the base steel sheet with respect to the entire interface between the ? phase and the base steel sheet in the hot-dip galvanized layer is 50% or less, the base steel sheet has predetermined chemical components and a refined layer in direct contact with the interface between the base steel sheet and the hot-dip galvanized layer, an average thickness of the refined layer is 0.1 to 5.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: November 3, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki Kawata, Takeshi Yasui, Kohei Ueda, Naoki Maruyama, Yuji Yamaguchi, Satoshi Uchida, Ryosuke Komami, Hayato Arai, Toyomitsu Nakamura
  • Patent number: 10822672
    Abstract: A steel sheet according to an aspect of the present invention has predetermined chemical composition, in which a structure at a thickness ¼ portion includes, in terms of volume ratios, tempered martensite: 30% to 70% and one or both of ferrite and bainite: a total of 20% to 70%, in the structure at the thickness ¼ portion, a volume ratio of residual austenite is less than 10%, a volume ratio of fresh martensite is 10% or less, a volume ratio of pearlite is 10% or less, and a total volume ratio of the residual austenite, the fresh martensite, and the pearlite is 15% or less, a number density of iron-based carbides having a major axis of 5 nm or more in the tempered martensite at the thickness ¼ portion is 5×107 particles/mm2 or more, a ratio of the number of ?-type carbides in the number of the iron-based carbides having the major axis of 5 nm or more at the thickness ¼ portion is 20% or more, and a tensile strength is 780 MPa or higher.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: November 3, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Yuri Toda, Masafumi Azuma, Akihiro Uenishi, Hiroyuki Kawata, Naoki Maruyama, Genichi Shigesato
  • Patent number: 10822683
    Abstract: A hot-dip galvanized steel sheet includes a base steel sheet and a hot-dip galvanized layer formed on at least one surface of the base steel sheet, in which the hot-dip galvanized layer includes Fe in a content of more than 0% to 5% or less, Al in a content of more than 0% to 1.0% or less, and columnar grains formed by a ? phase on the surface of the steel sheet, further, 20% or more of the entire interface between the hot-dip galvanized layer and the base steel sheet is coated with the ? phase, and a ratio of an interface formed between ? grains in which coarse oxides are present among grains and the base steel sheet with respect to the entire interface between the ? phase and the base steel sheet in the hot-dip galvanized layer is 50% or less, the base steel sheet has predetermined chemical components and a refined layer in direct contact with the interface between the base steel sheet and the hot-dip galvanized layer, an average thickness of the refined layer is 0.1 to 5.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: November 3, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki Kawata, Takeshi Yasui, Kohei Ueda, Naoki Maruyama, Yuji Yamaguchi, Satoshi Uchida, Ryosuke Komami, Hayato Arai, Toyomitsu Nakamura
  • Patent number: 10815553
    Abstract: Provided is a galvannealed steel sheet having high strength and excellent deep drawability, and being further excellent in slab cracking resistance and secondary working embrittlement resistance. A base metal steel sheet of the galvannealed steel sheet has a chemical composition containing, in mass %: C: 0.0080% or less; Si: 0.7% or less; Mn: 1.0 to 2.5%; P: more than 0.030 to 0.048%; S: 0.025% or less; Al: 0.005 to 0.20%; N: 0.010% or less; Ti: 0.005 to 0.040%; Nb: 0.005 to 0.060%; and B: 0.0005 to 0.0030%, with the balance being Fe and impurities, satisfying Formula (1) to (4). A galvannealed layer contains 7 to 15 mass % of Fe. 25×P+4×Si?3.6??(1) B?X1?0.0005??(2) C?(12/93)×Nb?X2??0.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: October 27, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Masaharu Oka, Nobusato Kojima, Tetsuya Okada
  • Patent number: 10807177
    Abstract: The present invention provides a method for MIG brazing an Al alloy to a steel sheet so as to manufacture a lap joint member that excels in bonding strength with respect to the Al alloy. With the MIG brazing method, a bonding target sheet, specifically, an Al sheet or an Al alloy sheet is bonded to a hot dip Zn-based alloy coated steel sheet (1) whose coating layer contains Al in an amount of 1.0% by mass to 22.0% by mass. A target location of MIG brazing is a region between (i) an intersection (C) of one end of an end surface (6) of the bonding target sheet and the hot dip Zn-based alloy coated steel sheet and (ii) the other end (U) of the end surface of the bonding target sheet.
    Type: Grant
    Filed: February 21, 2018
    Date of Patent: October 20, 2020
    Assignee: NIPPON STEEL NISSHIN CO., LTD.
    Inventors: Kazuaki Hosomi, Kouki Tomimura, Takefumi Nakako
  • Patent number: 10808291
    Abstract: A steel sheet according to an aspect of the present invention has predetermined chemical composition, in which a structure at a thickness ¼ portion includes, in terms of volume ratios, tempered martensite: 70% or more and one or both of ferrite and bainite: a total of less than 20%, in the structure at the thickness ¼ portion, a volume ratio of residual austenite is less than 10%, a volume ratio of fresh martensite is 10% or less, a volume ratio of pearlite is 10% or less, and a total volume ratio of the residual austenite, the fresh martensite, and the pearlite is 15% or less, a number density of iron-based carbides having a major axis of 5 nm or more in the tempered martensite at the thickness ¼ portion is 5×107 particles/mm2 or more, a ratio of the number of ?-type carbides in the number of the iron-based carbides having the major axis of 5 nm or more at the thickness ¼ portion is 20% or more, and a tensile strength is 780 MPa or higher.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: October 20, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Yuri Toda, Masafumi Azuma, Akihiro Uenishi, Hiroyuki Kawata, Naoki Maruyama, Genichi Shigesato
  • Patent number: 10745790
    Abstract: The present invention provides a method for manufacturing a metal sheet. In this method, at least one of the following equations is satisfied: Z d + 18 ? ? ln ? ( Z d ) < 8 ? ? ln ? ( P V ) - 27.52 ( A ) f ? ? O 2 < 2.304 · 10 - 3 ( 27.52 + Z d + 8 ? ? ln ? ( V P ? ( Z d ) 2.25 ) ) 2 ( B ) wherein: Z is the distance between the metal sheet and the nozzle along the main ejection direction (E), Z being expressed in mm, d is the average height of the outlet of the nozzle along with the running direction of the metal sheet in front of the nozzle, d being expressed in mm, V is the running speed of the metal sheet in front of the nozzle, V being expressed in m·s?1, P is the pressure of the wiping gas in the nozzle, P being expressed in N·m?2, and fO2 is the volume fraction of oxygen in the wiping gas. A metal sheet, part and land motor vehicle are also provided.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: August 18, 2020
    Assignee: ARCELORMITTAL
    Inventors: Jean-Michel Mataigne, Didier Dauchelle, Florence Bertrand
  • Patent number: 10711323
    Abstract: Provided are a steel sheet with excellent weldability, and a production method therefor. The steel sheet is characterized by having a specific composition and a metallographic structure containing, in terms of an area ratio, ferrite of 25% or more and 65% or less, martensite having iron-based carbides precipitated in the grains of 35% or more and 75% or less, and the balance structure other than the ferrite and the martensite of 20% or less (including 0%) in total, the average grain diameters of the ferrite and the martensite being respectively 5 ?m or lower, the total of concentration of Si and Mn at interface between the ferrite and the martensite being, in terms of an atomic concentration, 5% or more, and having a tensile strength of 900 MPa or higher.
    Type: Grant
    Filed: August 10, 2017
    Date of Patent: July 14, 2020
    Assignee: JFE Steel Corporation
    Inventors: Noriaki Kohsaka, Tatsuya Nakagaito, Lingling Yang
  • Patent number: 10704157
    Abstract: The present invention provides an aqueous treatment solution containing sulfate ions SO42? in a concentration greater than or equal to 0.01 mol/l, to treat sheet metal including a steel substrate coated on at least one face with a coating including at least zinc and magnesium to reduce blackening or tarnishing of the sheet metal during storage. The present invention also provides a sheet metal treated with a solution of this type.
    Type: Grant
    Filed: January 10, 2012
    Date of Patent: July 7, 2020
    Assignee: ARCELORMITTAL INVESTIGACIÓN Y DESARROLLO, S.L.
    Inventors: Daniel Chaleix, Christian Allely, Maxime Monnoyer, Pascale Feltin
  • Patent number: 10689735
    Abstract: A high strength steel sheet comprises 0.02 to 0.12 wt % of carbon (C), 0.5 to 2.0 wt % of manganese (Mn), 0.05 to 0.5 wt % of silicon (Si), 0.05 to 1.0 wt % of nickel (Ni), 0.005 to 0.1 wt % of titanium (Ti), 0.005 to 0.5 wt % of aluminum (Al), 0.015 wt % or less of phosphorus (P), 0.015 wt % or less of sulfur (S), and the balance of Fe and other inevitable impurities. The microstructure thereof includes 70% to 90% of ultrafine ferrite and 10% to 30% of MA (martensite/austenite) structure by area fraction, and the yield ratio (YS/TS) thereof is 0.8 or less.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: June 23, 2020
    Assignee: POSCO
    Inventors: Sung-Ho Jang, Woo-Gyeom Kim, Ki-Hyun Bang
  • Patent number: 10671664
    Abstract: A computer-based method of providing control commands of a control command set for manufacturing a three-dimensional object with an additive manufacturing device. The method includes at least the following steps: a step of allocating input data that represent at least a partial surface of the object to be manufactured, where the partial surface has an initial surface texture defined by a set of initial texture parameter values that characterize the geometry of the initial surface texture; a step of determining a set of target texture parameter values that differ from the set of initial texture parameter values, and a step of generating control commands of a control command set to manufacture the partial surface by the additive manufacturing device with a surface texture that is defined by the set of target texture parameter values.
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: June 2, 2020
    Assignee: EOS GmbH Electro Optical Systems
    Inventor: Dominik Sippel
  • Patent number: 10655194
    Abstract: A high-strength steel sheet having a high yield ratio and excellent stretch flangeability, and a method for producing the high-strength steel sheet. The high-strength steel sheet has a composition containing, by mass: C: 0.02% or more and less than 0.10%, Si: less than 0.10%, Mn: less than 1.0%, P: 0.10% or less, S: 0.020% or less, Al: 0.01% or more and 0.10% or less, N: 0.010% or less, Nb: 0.005% or more and less than 0.070%, and the balance being Fe and inevitable impurities; and a microstructure including, by area: ferrite: 85% or more, pearlite: 0% to 15%, and a total of martensite, retained austenite and cementite: 0% to 3%. The average crystal grain diameter of the ferrite is 15.0 ?m or less. The grain diameter of a Nb carbide is 5 to 50 nm. The amount of Nb carbide precipitate is 0.005% to 0.050% in terms of volume fraction.
    Type: Grant
    Filed: March 18, 2016
    Date of Patent: May 19, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Yuma Honda, Yoshimasa Funakawa, Kozo Harada
  • Patent number: 10648054
    Abstract: A method for producing high-strength galvanized steel sheets having excellent coating adhesion, workability and appearance. The method comprises hot rolling a slab comprising, by mass %, C: 0.05 to 0.30%, Si: 0.1 to 2.0% and Mn: 1.0 to 4.0%, then coiling the steel sheet into a coil at a specific temperature TC, and pickling the steel sheet, cold rolling the hot-rolled steel sheet resulting from the hot rolling, annealing the cold-rolled steel sheet resulting from the cold rolling under specific conditions, and galvanizing the annealed sheet resulting from the annealing in a galvanizing bath containing 0.12 to 0.22 mass % Al.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: May 12, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Yoichi Makimizu, Yoshitsugu Suzuki, Hideyuki Takahashi, Gentaro Takeda, Koichiro Fujita
  • Patent number: 10646949
    Abstract: The present invention has as its object to provide a spot welded joint and spot welding method which raise the fracture toughness of spot welded metal to raise the strength of the spot welded joint. In the present invention, there is provided a spot welding method comprising a melt zone forming step forming a melt zone by conduction and, after the melt zone forming step, a solidification step of running a current lower than the current run in the melt zone forming step so as to cause the melt zone to solidify, wherein, in the solidification step, electromagnetic vibration is applied to the melt zone, and a frequency fV of the electromagnetic vibration, a solidification speed ?S when the melt zone solidifies, and an arm interval of dendrites ?D when the melt zone solidifies satisfy 0.2??S/(?D·fV)?4.0.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: May 12, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Fuminori Watanabe, Yasunobu Miyazaki
  • Patent number: 10626477
    Abstract: A method for manufacturing a hot press formed part, includes: preparing a hot press forming object comprising a single-ply portion and a two-ply portion; heating the hot press forming object to a temperature range from an Ac3 transformation temperature of a base steel sheet of the first coated steel sheet to 1000° C.; press forming the hot press forming object to obtain a formed body, the press forming being started upon temperatures of the single-ply portion and of the two-ply portion being no higher than solidification points of Zn—Ni coating layers of the first and second coated steel sheets and no lower than an Ar3 transformation temperature of the base steel sheet of the first coated steel sheet; and quenching the formed body to thereby obtain a hot press formed part, in which the hot press forming object has a thickness ratio from 1.4 to 5.0.
    Type: Grant
    Filed: September 8, 2015
    Date of Patent: April 21, 2020
    Assignees: JFE STEEL CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Masaki Morino, Hideaki Kobiki, Tatsuya Nakagaito, Yuichi Tokita, Toru Minote, Yoshikiyo Tamai
  • Patent number: 10590509
    Abstract: A method for continuously annealing a steel strip includes annealing the steel strip in a vertical annealing furnace, an atmosphere in the furnace being separated by a partition disposed within a space spanning from the heating zone to the soaking zone. An atmosphere gas is supplied from an outside of the furnace into the furnace to form a furnace gas that is discharged from a steel strip entrance at a lower portion of the heating zone, a part of the furnace gas is sucked and discharged into a refiner including a deoxygenator and a dehumidifier such that oxygen and moisture in the part of the furnace gas are removed to form a gas having a lowered dew point, and the gas having a lowered dew point is returned into the furnace. The method further includes controlling a temperature of the steel strip passing through the partition to a range of 550° C. to 700° C.
    Type: Grant
    Filed: June 10, 2013
    Date of Patent: March 17, 2020
    Assignee: JFE Steel Corporation
    Inventor: Hideyuki Takahashi
  • Patent number: 10526690
    Abstract: A high-strength hot-dip galvanized steel sheet that is a steel sheet that includes major components and that contains at least 40 vol. % the sum of bainite and martensite, 8-60 vol. % retained austenite, and less than 40 vol. % ferrite, with the remainder comprising an incidental structure. The hot-dip galvanized steel sheet has, at the interface between the deposit layer formed by hot-dip galvanization and the base steel sheet, an intermetallic compound constituted of Fe, Al, Zn, and incidental impurities and having an average thickness of 0.1-2 ?m, the intermetallic compound having a crystal grain diameter of 0.01-1 ?m. After the deposit layer formed by hot-dip galvanization was removed, the surface of the base steel sheet has an arithmetic average roughness Ra of 0.1-2.0 ?m and gives a roughness curve in which the contour elements have an average length RSm of 5-300 ?m.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: January 7, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Shintaro Yamanaka, Soshi Fujita, Koichi Sato
  • Patent number: 10526679
    Abstract: There is provided a hot-dip galvanized steel sheet and a hot-dip galvannealed steel sheet, which have excellent elongation properties, and methods for manufacturing the hot-dip galvanized steel sheet and the hot-dip galvannealed steel sheet. The present disclosure relates to a hot-dip galvanized steel sheet in which a hot-dip galvanized layer is formed on a surface of abase steel sheet, the hot-dip galvanized steel sheet having excellent elongation properties and being characterized by the composition and the microstructure thereof.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: January 7, 2020
    Assignee: POSCO
    Inventors: Sang Ho Han, Seong Ho Han
  • Patent number: 10501838
    Abstract: The present invention provides a cooling device for a hot-dip plating device provided on an upper side of a plating thickness control device in a conveyance route of a hot-dip plated steel sheet that is conveyed from a plating bath in a vertically upward direction. The cooling device includes: a main cooling device that vertically sprays a main cooling gas to the hot-dip plated steel sheet; and a preliminary cooling device that is provided in a preliminary cooling section between the main cooling device and the plating thickness control device in the conveyance route, and sprays a preliminary cooling gas to a plurality of gas collision positions which are set along the preliminary cooling section.
    Type: Grant
    Filed: October 24, 2014
    Date of Patent: December 10, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Tooru Oohashi, Kazuki Machida, Hiroshi Nakata, Katsuya Kojima, Kohhei Hayakawa
  • Patent number: 10494689
    Abstract: A high-strength galvanized steel sheet having a chemical composition containing, by mass %, C: 0.07% to 0.25%, Si: 0.01% to 3.00%, Mn: 1.5% to 4.0%, P: 0.100% or less, S: 0.02% or less, Al: 0.01% to 1.50%, N: 0.001% to 0.008%, Ti: 0.003% to 0.200%, B: 0.0003% to 0.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: December 3, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Hiroshi Hasegawa, Yoshimasa Funakawa
  • Patent number: 10494693
    Abstract: A high-strength steel sheet having a high yield ratio and a reduced difference in strength between the center and edges of the steel sheet in the width direction. The high-strength steel sheet includes a composition containing, by mass, C: 0.02% or more and less than 0.10%, Si: less than 0.10%, Mn: less than 1.0%, P: 0.10% or less, S: 0.020% or less, Al: 0.01% or more and 0.10% or less, N: 0.010% or less, Nb: 0.005% or more and less than 0.070%, and the balance being Fe and inevitable impurities. Additionally, the steel sheet has a microstructure including, by area, ferrite: 90% or more, pearlite: 0% to 10%, and the total of martensite, retained austenite, and cementite: 0% to 3%. The average crystal grain diameter dC of the ferrite at the center of the steel sheet in the width direction is 15.0 ?m or less.
    Type: Grant
    Filed: March 22, 2016
    Date of Patent: December 3, 2019
    Assignee: JFE STEEL CORPORATION
    Inventors: Yuma Honda, Yoshimasa Funakawa, Kozo Harada
  • Patent number: 10472710
    Abstract: Provided is a Zn—A—Mg coated steel sheet having a plated layer including from 4 to 22% by mass of Al, from 1.0 to 6.5% by mass of Mg, from 0.001 to 1.000% by mass of Si, as well as Zn and impurities as the balance, wherein the structure of the plated layer contains an Al primary crystal, the Al primary crystal including: a cellular dendrite-shaped first Al primary crystal and a second axis spacing of from 0.5 to 2.0 ?m; a minute equi-axed dendrite-shaped second Al primary crystal and a second axis spacing of from 0.5 to 2.0 ?m; and a petal-shaped third Al primary crystal with a principal axis length of from 0.5 to 3.0 ?m and a ternary eutectic structure of Al, Zn, and Mg2Zn11 as a structure other than the Al primary crystal.
    Type: Grant
    Filed: April 8, 2015
    Date of Patent: November 12, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Shigeru Hashimoto, Makoto Nakazawa
  • Patent number: 10407760
    Abstract: A hot-dip galvanized steel sheet includes: a steel sheet; and a plated layer on a surface of the steel sheet, a microstructure contains, by volume fraction, equal to or more than 20% and equal to or less than 99% in total of one or two of martensite and bainite, a residual structure contains one or two of ferrite, residual austenite of less than 8% by volume fraction, and pearlite of equal to or less than 10% by volume fraction, tensile strength is equal to or greater than 980 MPa, the plated layer is a hot-dip galvanized layer which contains oxides including one or two or more of Si, Mn, and Al, contains equal to or less than 15 mass % of Fe, and a remainder including Zn, Al, and unavoidable impurities, and when a cross section including the steel sheet and the hot-dip galvanized layer is seen in a sheet thickness direction, a projected area ratio is equal to or more than 10% and equal to or less than 90%.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: September 10, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Masafumi Azuma, Chisato Wakabayashi, Takayuki Nozaki, Manabu Takahashi, Nobuhiro Fujita
  • Patent number: 10400315
    Abstract: A cold rolled and hot dip coated steel sheet presenting a tensile strength above 1000?50×Al MPa, a uniform elongation above 15% and a low density is provided. The steel includes, by weight percent: 0.1?C?0.5%, 3.5?Mn?10.0%, 0?Al?9.0%, Si?5.0%, Ti?0.2%, V?0.2%, Nb?0.2%, S?0.004%, P?0.025%, 0.5?Si+Al?9.0%, B?0.0035, Cr?1%, The balance being Fe and impurities and the microstructure containing 25% to 90% of ferrite, 10% to 50% of austenite, kappa precipitates lower than 5% and martensite lower than 25%. The steel is able to be coated using total oxidation.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: September 3, 2019
    Assignee: ARCELORMITTAL INVESTIGACIÓN Y DESARROLLO, S.L.
    Inventors: Franco Del Frate, Jean-Michel Mataigne, Jonas Staudte, Astrid Perlade, Ian Alberto Zuazo-Rodriguez
  • Patent number: 10351937
    Abstract: The present invention provides a high-strength steel sheet excellent in impact resistance. The high-strength steel sheet contains predetermined contents of C, Si, Mn, P, S, Al, Ti, N, and O, with the balance being iron and inevitable impurities, and has a steel sheet structure in which, in a ? thickness to ? thickness region across ¼ of a sheet thickness, 1 to 8% retained austenite is contained in volume fraction, an average aspect ratio of the retained austenite is 2.0 or less, an amount of solid-solution Mn in the retained austenite is 1.1 times an average amount of Mn or more, and TiN grains having a 0.5 ?m average grain diameter or less are contained, and a density of AlN grains with a 1 ?m grain diameter or more is 1.0 pieces/mm2 or less, wherein a maximum tensile strength is 900 MPa or more.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: July 16, 2019
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki Kawata, Naoki Maruyama, Akinobu Murasato, Akinobu Minami, Hajime Hasegawa, Chisato Wakabayashi, Tsuyoshi Oki
  • Patent number: 10273566
    Abstract: A hot-rolled steel sheet includes, as a chemical composition, by mass %, C: 0.030% to 0.10%, Mn: 0.5% to 2.5%, and Si+Al: 0.100% to 2.5%, in which the steel sheet has a microstructure including, by area fraction, ferrite: 80% or more, martensite: 3% to 15.0%, and pearlite: less than 3.0%, in which a number density of martensite having an equivalent circle diameter of 3 ?m or more at a position which is at a depth of ¼ of the steel sheet thickness from the surface of the steel sheet, is 5.0 pieces/10000 ?m2 or less, and the following Expression (1) is satisfied. R/DM2?1.00??Expression (1) Here, R is an average martensite interval (?m) defined by the following Expression (2), and DM is a martensite average diameter (?m). R={12.5×(?/6VM)0.5?(?)0.5}×DM??Expression (2) Here, VM is a martensite area fraction (%) and DM is the martensite average diameter (?m).
    Type: Grant
    Filed: December 11, 2012
    Date of Patent: April 30, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Daisuke Maeda, Osamu Kawano, Junji Haji, Fuminori Tasaki
  • Patent number: 10273555
    Abstract: A hot-pressed steel sheet member includes a specific chemical composition and further includes a steel structure in which an area ratio of ferrite in a surface layer portion ranging from a surface to 15 ?m in depth is greater than 1.20 times an area ratio of ferrite in an inner layer portion being a portion excluding the surface layer portion, and the inner layer portion contains a steel structure represented, in area %, ferrite: 10% to 70%, martensite: 30% to 90%, and a total area ratio of ferrite and martensite: 90% to 100%. A tensile strength of the hot-pressed steel sheet member is 980 MPa or more.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: April 30, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Koutarou Hayashi
  • Patent number: 10196727
    Abstract: A method of manufacturing a galvanized steel sheet includes a two-stage temperature raising process which includes: primary heating the sheet from 200° C. to an intermediate temperature of 500 to 800° C. at a primary average heating rate of 5 to 50° C./second at an excess air ratio of 1.10 to 1.20 maintained up to the intermediate temperature; secondary heating the sheet from the intermediate temperature to an annealing temperature of 730 to 900° C. at a secondary average heating rate of 0.1 to 10° C./second at an excess air ratio of less than 1.10 maintained up to the annealing temperature; holding the sheet to the annealing temperature for 10 to 500 seconds; cooling the sheet to 450 to 550° C. at an average cooling rate of 1 to 30° C./second; and subjecting the sheet to a galvanizing process and, optionally, an alloying process.
    Type: Grant
    Filed: September 30, 2015
    Date of Patent: February 5, 2019
    Assignee: JFE Steel Corporation
    Inventors: Shusaku Takagi, Kohei Hasegawa
  • Patent number: 10131981
    Abstract: The present invention provides a hot-dip galvanized steel sheet that is excellent in plating wettability and plating adhesiveness even when a base steel sheet contains Si and Mn, and a manufacturing method of the same. The hot-dip galvanized steel sheet according to the present invention includes a base steel sheet containing Si, Mn, and other predetermined components, and a hot-dip galvanizing layer formed on at least one surface of the base steel sheet. In the base steel sheet, a value of HA representing average hardness in a surface layer ranging from an interface between the base steel sheet and the hot-dip galvanizing layer to 50 ?m in depth and a value of HB representing average hardness in a deep portion ranging from the interface to greater than 50 ?m in depth satisfy all the following three relational expressions. 50?HA?500??(1) 50?HB?500??(2) 0.5?HA/HB?0.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: November 20, 2018
    Assignee: NIPPON STEEL AND SUMITOMO METAL CORPORATION
    Inventors: Soshi Fujita, Shintaro Yamanaka
  • Patent number: 10081857
    Abstract: A metallic flat product is disclosed which is subjected to surface finishing by hot-dip coating and which is preferably composed of steel. The metallic flat product includes a metallic alloy layer (11) and a metallic surface layer (12?), which metallic alloy layer and metallic surface layer differ from one another in terms of their chemical composition. The two layers (11, 12?) are produced in a one process step and define a continuous transition region (13) in which a mixture of the two different chemical compositions is present. The metallic alloy layer (11) has a thickness of less than 8 ?m, preferably less than 6 ?m, and the surface layer (12?) is formed from aluminum or zinc. The flat product has an improved coating, by means of which the flat product more effectively satisfies the requirements with regard to good deformability and has good anti-corrosion protection.
    Type: Grant
    Filed: January 6, 2014
    Date of Patent: September 25, 2018
    Assignee: ThyssenKrupp Steel Europe AG
    Inventors: Jegor Bergen, Frank Spelleken, Michael Peters, Manuela Ruthenberg, Friedhelm Macherey, Florian Spelz
  • Patent number: 10077486
    Abstract: A high-strength cold-rolled steel sheet has a composition and a microstructure. The microstructure comprises: ferrite having an average grain size of 5 ?m or less and a volume fraction of 3% to 20%, retained austenite having a volume fraction of 5% to 20%, and martensite having a volume fraction of 5% to 20%, the remainder being bainite and/or tempered martensite. The total number of retained austenite with a grain size of 2 ?m or less, martensite with a grain size of 2 ?m or less, or a mixed phase thereof is 150 or more per 2,000 ?m2 of a thickness cross section parallel to the rolling direction of the steel sheet.
    Type: Grant
    Filed: July 18, 2014
    Date of Patent: September 18, 2018
    Assignee: JFE Steel Corporation
    Inventors: Katsutoshi Takashima, Yoshihiko Ono, Kohei Hasegawa
  • Patent number: 10030291
    Abstract: Disclosed is a high-strength steel sheet having a tensile strength of 1180 MPa or more and having satisfactory seam weldability. The steel sheet has a chemical composition of C: 0.12% to 0.40%, Si: 0.003% to 0.5%, Mn 0.01% to 1.5%, Al: 0.032% to 0.15%, N: 0.01% or less, P: 0.02% or less, S: 0.01% or less, Ti: 0.01% to 0.2% or less, and B: 0.0001% to 0.01%, with the remainder including iron and inevitable impurities, has a Ceq1 (=C+Mn/5+Si/13) of 0.50% or less, and has a steel structure of a martensite single-phase structure.
    Type: Grant
    Filed: July 12, 2012
    Date of Patent: July 24, 2018
    Assignee: Kobe Steel, Ltd.
    Inventors: Atsuhiro Shiraki, Yukihiro Utsumi
  • Patent number: 9994939
    Abstract: A high-strength galvanized steel sheet comprising a cold-rolled steel sheet, an intermetallic compound formed on the cold-rolled steel sheet, and a galvanizing layer formed on the intermetallic compound, the cold-rolled steel sheet having a specific composition and a microstructure having a martensite area ratio of 7% or more and less than 25% and a ferrite area ratio of 50% or more and which includes a base metal surface portion in which the amount of internal oxides per single side is 0.05 g/m2 or less.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: June 12, 2018
    Assignee: JFE STEEL CORPORATION
    Inventor: Yoshitsugu Suzuki
  • Patent number: 9988700
    Abstract: The present invention provides a high-strength steel sheet excellent in shape fixability. The high-strength steel sheet contains C, Si, Mn, P, S, Al, N, and O with predetermined contents, in which a retained austenite phase of 5 to 20% in volume fraction is contained, an amount of solid-solution C contained in the retained austenite phase is 0.80 to 1.00% in mass %, WSi? is 1.10 times or more WSi*, WMn? is 1.10 times or more WMn*, and when a frequency distribution is measured with respect to a sum of a ratio between WSi and WSi* and a ratio between WAl and WAl*, a mode value of the frequency distribution is 1.95 to 2.05, and a kurtosis is 2.00 or more.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: June 5, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Akinobu Minami, Hiroyuki Kawata, Akinobu Murasato, Yuji Yamaguchi, Natsuko Sugiura, Takuya Kuwayama, Naoki Maruyama, Takamasa Suzuki
  • Patent number: 9970092
    Abstract: A galvanized steel sheet includes a steel sheet and a plating layer on the surface of the steel sheet, in which the steel sheet includes, as a steel chemical composition, by mass %, C: 0.05 to 0.40%, Si: 0.5 to 3.0% and Mn: 1.5 to 3.0%, a microstructure of the steel sheet includes ferrite, bainite, by volume fraction, 30% or more of a tempered martensite, and 8% or more of an austenite, and tensile strength of the steel sheet is 980 MPa or more, and the plating layer includes an oxide including at least one chemical element selected from Si, Mn and Al, and when seen at a cross section including the steel sheet and the plating layer in a plate thickness direction, a projection area fraction of the oxide is 10% or more.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: May 15, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Takayuki Nozaki, Manabu Takahashi, Nobuhiro Fujita, Masafumi Azuma, Chisato Wakabayashi
  • Patent number: 9963771
    Abstract: A high-strength galvanized steel sheet comprising a cold-rolled steel sheet, an intermetallic compound formed on the cold-rolled steel sheet, and a galvanizing layer formed on the intermetallic compound, the cold-rolled steel sheet having a specific composition and a microstructure having a martensite area ratio of 7% or more and less than 25% and a ferrite area ratio of 50% or more and which includes a base metal surface portion in which the amount of internal oxides per single side is 0.05 g/m2 or less.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: May 8, 2018
    Assignee: JFE STEEL CORPORATION
    Inventor: Yoshitsugu Suzuki
  • Patent number: 9932659
    Abstract: A hot-dip galvanized steel sheet having a good appearance and good adhesion to a coating, the hot-dip galvanized steel sheet having a composition containing, on a mass basis: C: 0.08% or more and less than 0.20%, Si: 0.1% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less, a remainder being Fe and incidental impurities, wherein the hot-dip galvanized steel sheet includes an internal oxidation layer and a decarburized layer, the internal oxidation layer having a thickness of 5 ?m or less, the decarburized layer having a thickness of 20 ?m or less, and 50% or more by area of the internal oxidation layer is composed of a Si oxide containing Fe and/or Mn represented by Fe2XMn2-2XSiOY, wherein X ranges from 0 to 1, and Y is 3 or 4.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: April 3, 2018
    Assignee: JFE Steel Corporation
    Inventors: Minoru Tanaka, Yoshitsugu Suzuki, Yasunobu Nagataki
  • Patent number: 9914992
    Abstract: The present invention provides a process for manufacturing a metal strip having a metallic corrosion protection coating. The process includes making the metal strip pass through a bath of molten metal having between 2 and 8 wt. % aluminum, 0 to 5 wt. % magnesium and up to 0.3 wt. % addition elements, the balance being zinc and inevitable impurities. The bath is maintained at a temperature between 350 and 700° C. Nozzles wipe the coated metal strip spraying a gas on either side of the strip. The coating is cooled in a controlled manner until it has completely solidified. A metal strip and a metal part obtained by deformation of this strip are also provided.
    Type: Grant
    Filed: May 14, 2009
    Date of Patent: March 13, 2018
    Assignee: Arcelormittal Investigacion Y Desarrollo SL
    Inventors: Luc Diez, Jean-Michel Mataigne
  • Patent number: 9896737
    Abstract: A hot-rolled steel sheet consists of, in mass %, C: 0.03-0.2%, Mn: 0.1-3.0%, P: 0.10% or less, S: 0.03% or less, Al+Si: 0.2-3.0%, N: more than 0% to 0.01%, O: more than 0% to 0.01%, and balance: iron and impurities. A microstructure contains ferrite and hard phases of martensite and/or austenite in an amount of, in area fraction, 3% to less than 20%. Hard phases with an aspect ratio of 3 or more account for 60% or more of the hard phases present in a sheet-thickness central portion. A length in a rolling direction of the hard phases is less than 20 ?m. An average aspect ratio of ferrite grains is less than 5. The sum of X-ray random intensity ratios of <011> and <111> orientation from the rolling direction is 3.5 or more, and an X-ray random intensity ratio of <001> orientation from the rolling direction is 1.0 or less.
    Type: Grant
    Filed: July 13, 2015
    Date of Patent: February 20, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Hiroshi Shuto, Tatsuo Yokoi, Daisuke Maeda, Eisaku Sakurada, Takeshi Toyoda
  • Patent number: 9873934
    Abstract: A hot-dip galvanized steel sheet having a good appearance and good adhesion to a coating, the hot-dip galvanized steel sheet having a composition including, on a mass basis: C: 0.20% to 0.50%, Si: 0.1% to 3.0%, Mn: 0.5% to 3.0%, P: 0.001% to 0.10%, Al: 0.01% to 3.00%, and S: 0.200% or less, a remainder being Fe and incidental impurities, wherein the hot-dip galvanized steel sheet includes an internal oxidation layer and a decarburized layer, the internal oxidation layer having a thickness of 4 ?m or less, the decarburized layer having a thickness of 16 ?m or less, and 50% or more by area of the internal oxidation layer is composed of a Si oxide containing Fe and/or Mn represented by Fe2XMn2-2XSiOY, wherein X ranges from 0 to 1, and Y is 3 or 4.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: January 23, 2018
    Assignee: JFE Steel Corporation
    Inventors: Minoru Tanaka, Yoshitsugu Suzuki, Yasunobu Nagataki
  • Patent number: 9783878
    Abstract: Provided is a high-strength hot-dip galvanized steel sheet having excellent plating adhesion, formability, and hole expandability with an ultimate tensile strength of 980 MPa or more, the hot-dip galvanized steel sheet comprising a hot-dip galvanized layer formed on a surface of a base steel sheet. The base steel sheet contains, by mass %, C: 0.05% to 0.4 %; Si: 0.01% to 3.0%; Mn: 0.1% to 3.0%; Al: 0.01 to 2.0%; in which Si+Al >0.5%, P: limited to 0.04% or less; S: limited to 0.05% or less; N: limited to 0.01% or less; and a balance including Fe and inevitable impurities, a microstructure of the base steel sheet contains 40% or more by total volume fraction of martensite and bainite, 8% or more by volume fraction of residual austenite, and a balance of the microstructure being ferrite or ferrite and 10% or less by volume fraction of pearlite.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: October 10, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Chisato Wakabayashi, Masafumi Azuma, Nobuhiro Fujita, Kohichi Sano
  • Patent number: 9752221
    Abstract: A steel sheet which uses steel sheet which contains the easily oxidizable elements Si and Mn as a base material and which is provided with a hot dip galvanized layer which is excellent in plating wettability and plating adhesion and a method of production of the same are provided. A hot dip galvanized steel sheet which is comprised of a steel sheet having a hot dip galvanized layer A on the surface of the steel sheet, characterized by having the following B layer right under the steel sheet surface and in the steel sheet: B layer: Layer which has thickness of 0.001 ?m to 0.5 ?m, which contains, based on mass of the B layer, one or more of Fe, Si, Mn, P, S, and Al oxides in a total of less than 50 mass %, which contains C, Si, Mn, P, S, and Al not in oxides in C: less than 0.05 mass %, Si: less than 0.1 mass %, Mn: less than 0.5 mass %, P: less than 0.001 mass %, S: less than 0.001 mass %, and Al: less than 0.005 mass % and which contains Fe not in oxides in 50 mass % or more.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: September 5, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Soshi Fujita, Shintaro Yamanaka, Koichi Sato
  • Patent number: 9745654
    Abstract: Provided is a hot dip zinc alloy plated steel sheet which is widely used in vehicles, domestic appliances, construction materials or the like and a method for manufacturing the same. A Zn—Al—Mg hot dip zinc alloy plating bath is used for manufacturing the hot dip zinc alloy plated steel strip, and a small amount of Ga or In is added to the plating bath for inhibiting an oxidation reaction of Mg in the plating bath so as to obtain excellent corrosion resistance and external surface of the plated steel sheet which is manufactured at this point.
    Type: Grant
    Filed: July 23, 2013
    Date of Patent: August 29, 2017
    Assignee: POSCO
    Inventors: Min-Suk Oh, Young-Sool Jin, Sang-Heon Kim, Su-Young Kim, Bong-Hwan Yoo
  • Patent number: 9708703
    Abstract: A high-manganese hot-rolled galvanized steel sheet having no surface defects and improved galvanizing and alloying characteristics is manufactured by using a high-manganese hot-rolled steel sheet. Provided are the high-manganese hot-rolled galvanized steel sheet and a method of manufacturing the high-manganese hot-rolled galvanized steel sheet. The high-manganese hot-rolled galvanized steel sheet includes: a hot-rolled steel sheet including 5 wt % to 35 wt % manganese; and a zinc coating layer formed on the hot-rolled steel sheet, wherein an internal oxide layer is formed in an internal region of the hot-rolled steel sheet facing the zinc coating layer.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: July 18, 2017
    Assignee: POSCO
    Inventors: Sun-Ho Jeon, Kwang-Geun Chin
  • Patent number: 9631282
    Abstract: A method for depositing nickel-metal layers for colouring surfaces, and a bath for depositing such a layer. This is made possible by depositing a nickel-metal layer from a bath for the electroless deposition of nickel which contains at least one further metal compound, a voltage being additionally applied enable the metal of the metal compound to be incorporated while forming a nickel-metal layer.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: April 25, 2017
    Assignee: Schauenburg Ruhrkunststoff GmbH
    Inventor: Stefan Koppe
  • Patent number: 9499697
    Abstract: A coating composition is substantially free from chromate and comprises a resin, a metal salt, and an interference pigment. The interference pigment includes mica which has a solar reflective coating disposed thereon. A reflective coating system comprises a cured film formed from the coating composition disposed on a substrate. The cured film has a transparency of at least 75%, as measured according to ASTM 1746. In addition, the cured film has a solar reflectivity of at least 55%, as measured according to ASTM E 1918 and ASTM E 903. The cured film has excellent corrosion resistance properties and adhesion to the substrate.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: November 22, 2016
    Assignee: PPG Industries Ohio, Inc.
    Inventors: Mark Slawikowski, Donald J. Algrim
  • Patent number: 9481148
    Abstract: The present invention provides a high-corrosion-resistance hot-dip galvanized steel sheet having excellent appearance uniformity. The steel sheet includes: a coating layer containing Al: 4 to 22 mass %, Mg: 1 to 6 mass %, and Si: 0.001 to 1 mass %, and a balance being composed of Zn and inevitable impurities formed on a surface, in which at an interface between the coating layer and a base steel sheet, Mg2Si phases and Ca phases each mainly composed of Ca or a Ca compound exist, and at least part of the Mg2Si phases precipitate by using the Ca phases as a nucleus.
    Type: Grant
    Filed: June 29, 2012
    Date of Patent: November 1, 2016
    Assignee: NIPPON STEEL AND SUMITOMO METAL CORPORATION
    Inventors: Takeshi Yasui, Tooru Oohashi, Nayuta Kawazu, Satoru Tanaka, Akio Saito
  • Patent number: 9333727
    Abstract: A steel manufacturing process can include forming an iron oxide layer on a hot band during hot rolling; reducing the iron oxide layer on the hot band to form a sponge iron layer that includes pores; the sponge-iron layer having a thickness in a range of about 0.05 ?m to about 1000 ?m, about 0.1 ?m to about 100 ?m, or about 5 ?m to about 25 ?m; and depositing an alloying element into the pores of the sponge iron layer to form an impregnated sponge-iron layer. The process can further include annealing the impregnated sponge-iron layer to produce an iron alloy layer carried by the substrate.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: May 10, 2016
    Assignee: Arcanum Alloy Design Inc.
    Inventor: Daniel E. Bullard
  • Patent number: 9315876
    Abstract: There is provided a useful method for producing a press-formed product without causing disadvantages such as hardness variation, which product has favorable formability in a level so as to be able to be produced by deep drawing, and which method is carried out by heating a thin steel sheet to a temperature not lower than an Ac3 transformation point thereof; and then cooling the thin steel sheet at a rate not lower than a critical cooling rate, during which the thin steel sheet is formed into the press-formed product, wherein the forming is started from a temperature higher than a martensitic transformation start temperature Ms thereof, the cooling rate is kept to be 10° C./sec. or higher during the forming, and the forming is finished in a temperature range not higher than the martensitic transformation start temperature Ms.
    Type: Grant
    Filed: September 30, 2011
    Date of Patent: April 19, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Keisuke Okita, Junya Naitou, Shushi Ikeda