Ferrous (i.e., Iron Base) Patents (Class 148/320)
  • Patent number: 11365465
    Abstract: A steel sheet includes a predetermined chemical composition, and includes a steel microstructure represented by, in an area ratio, ferrite: 5% to 80%, a hard microstructure constituted of bainite, martensite or retained austenite or an arbitrary combination of the above: 20% to 95%, and a standard deviation of a line fraction of the hard microstructure on a line in a plane perpendicular to a thickness direction: 0.050 or less in a depth range where a depth from a surface when a thickness of a steel sheet is set as t is from 3t/8 to t/2.
    Type: Grant
    Filed: August 8, 2017
    Date of Patent: June 21, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Shohei Yabu, Akihiro Uenishi, Koutarou Hayashi
  • Patent number: 11352683
    Abstract: A lower carbon steel alloy with specific substitutional alloying additions. The alloy is useful in the production of ASTM A516 grade pressure vessel steel plates with excellent HIC resistance. The material has a ferrite-pearlite microstructure, in normalized and stress relieved condition, appropriate for resisting hydrogen induced cracking, with isolated ferrite and pearlite constituents and no continuous pearlite bands. The material exhibits significant low temperature toughness.
    Type: Grant
    Filed: August 18, 2020
    Date of Patent: June 7, 2022
    Assignee: AcelorMittal
    Inventor: Amar Kumar De
  • Patent number: 11313009
    Abstract: A hot-rolled steel sheet according to an aspect of the present invention has a predetermined chemical composition, in which, in a location at a depth of ¼ of a sheet thickness from a surface, an area ratio of ferrite is 10% to 55%, a total area ratio of bainite and martensite is 45% to 90%, a total area ratio of the ferrite, the bainite, and the martensite is 90% or more, an average crystal grain size is 12.0 ?m or less, in a texture measured in a sheet thickness central portion, a maximum pole density of orientation groups of {100} <011>, {211} <011>, {311} <011>, {110} <011>, and {332} <113> is 8.0 or less, a total of pole densities of {211} <011> and {332} <113> is 10.0 or less, and a tensile strength is 950 MPa or more.
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: April 26, 2022
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Mitsuru Yoshida, Nobusato Kojima, Yuuki Kanzawa, Kohhei Kamiya
  • Patent number: 11293073
    Abstract: Present invention discloses a high strength hot rolled steel product with tensile strength at least 1100 MPa and elongation not less than 21%. The steel further has uniform elongation not less than 10% and yield and tensile ratio 0.6-0.7. The steel further has tensile toughness in the range 19-23.5 GPa %. The developed steel is primarily aimed for automotive structural applications and also for many other such as defence where good combination of strength and ductility required is very high. The developed steel product has following composition C: 0.15-0.23, Mn: 0.8-2.1, Si: 0.3-1.1, Cr: 0.8-1.3, Mo: 0.08-0.25, Nb: 0.018-0.035, Ti—0.01-0.1 S—0.008 max, P—0.025 max, Al—0.05 to 0.3, N—0.005 max. The liquid metal was continuous cast into slab casting. The cast slab was soaked above 1150° C. for few hours and subsequently the cast structure was broken by deformation prior to hot rolling.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: April 5, 2022
    Assignee: TATA STEEL LIMITED
    Inventors: Rajib Saha, Saurabh Kundu, A. N. Bhagat
  • Patent number: 11268176
    Abstract: The invention discloses a high-strength steel plate, comprising the following chemical elements in mass percentages: C: 0.070-0.115%, Si: 0.20-0.50%, Mn: 1.80-2.30%, Cr: 0-0.35%, Mo: 0.10-0.40%, Nb: 0.03-0.06%, V: 0.03-0.06%, Ti: 0.002-0.04%, Al: 0.01-0.08%, B. 0.0006-0.0020%, N?0.0060%, O?0.0040% Ca: 0-0.0045%, and the balance of Fe and unavoidable impurities. The invention further discloses a process of manufacturing said high-strength steel plate.
    Type: Grant
    Filed: December 24, 2013
    Date of Patent: March 8, 2022
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Sixin Zhao, Liandeng Yao
  • Patent number: 11268175
    Abstract: An aspect of the present invention relates to a high-strength steel, having excellent fracture initiation resistance and fracture propagation arrestability at low temperature.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: March 8, 2022
    Assignee: POSCO
    Inventors: Kyung-Keun Um, Woo-Gyeom Kim, Woo-Yeol Cha, Jin-Woo Chae
  • Patent number: 11225697
    Abstract: A hot rolled light-gauge martensitic steel sheet made by the steps comprising: (a) preparing a molten steel melt comprising: (i) by weight, between 0.20% and 0.35% carbon, less than 1.0% chromium, between 0.7% and 2.0% manganese, between 0.10% and 0.50% silicon, between 0.1% and 1.0% copper, less than 0.05% niobium, less than 0.5% molybdenum, and silicon killed containing less than 0.01% aluminum, and (ii) the remainder iron and impurities resulting from melting; (b) solidifying at a heat flux greater than 10.0 MW/m2 and cooling the molten melt into a steel sheet less than 2.0 mm in thickness in a non-oxidizing atmosphere to below 1080° C. and above Ar3 temperature at a cooling rate greater than 15° C./s; and (c) hot rolling the steel sheet to between 15% and 50% reduction and rapidly cooling.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: January 18, 2022
    Assignee: NUCOR CORPORATION
    Inventors: James W. Watson, Paul Kelly, David C. Van Aken, Christopher Ronald Killmore
  • Patent number: 11203795
    Abstract: Provided is an ultra-high strength steel plate for automobiles and, more specifically, to an ultra-high strength steel plate having high formability and hole expandability, and a method for manufacturing the ultra-high strength steel plate. The ultra-high strength steel plate includes: by wt %, carbon (C): 0.04% to 0.17%, silicon (Si): 2% or less, manganese (Mn): 4% to 10%, phosphorous (P): 0.05% or less (excluding 0%), sulfur (S): 0.02% or less (excluding 0%), aluminum (Al): 0.5% or less (excluding 0%), nitrogen (N): 0.02% or less (excluding 0%), and a balance of iron (Fe) and inevitable impurities. Carbon (C) and manganese (Mn) satisfy Formula C+(Mn/25)?0.46. The ultra high strength steel plate has a microstructure comprising retained austenite in a volume fraction of 20% or greater and annealed martensite in a volume fraction of 50% or greater.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: December 21, 2021
    Assignee: POSCO
    Inventors: Kyoo-Young Lee, Joo-Hyun Ryu, Sea-Woong Lee, Won-Hwi Lee, Byun-Mok Hwang
  • Patent number: 11198928
    Abstract: A method for producing a dual phase steel sheet is provided. The method includes providing a dual phase hot rolled steel sheet having a microstructure including ferrite and martensite and a composition including 0.1 to 0.3 wt. % C, 1.5 to 2.5 wt. % Si and 1.75 to 2.5 wt. % Mn. The steel sheet is annealed at a temperature from 750 to 875° C., water quenched to a temperature from 400 to 420° C. and subject to overaging at the temperature from 400 to 420° C. to convert the martensite in the hot rolled steel sheet to tempered martensite. The overaging is sufficient to provide the hot rolled steel sheet with a hole expansion ratio of at least 15%.
    Type: Grant
    Filed: November 15, 2019
    Date of Patent: December 14, 2021
    Assignee: ArcelorMittal
    Inventors: Hyun Jo Jun, Narayan S. Pottore, Nina Michailovna Fonstein
  • Patent number: 11186902
    Abstract: A wire material for a canted coil spring includes a core wire composed of a steel having a pearlite structure, a copper plating layer covering the outer peripheral surface of the core wire, the copper plating layer being composed of copper or a copper alloy, and a hard layer disposed adjacent to the outer periphery of the copper plating layer, the hard layer having a higher hardness than the copper plating layer. The steel constituting the core wire contains 0.5% or more by mass and 1.0% or less by mass carbon, 0.1% or more by mass and 2.5% or less by mass silicon, and 0.3% or more by mass and 0.9% or less by mass manganese, the balance being iron and unavoidable impurities.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: November 30, 2021
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takumi Akada, Hiromu Izumida, Akihisa Hosoe
  • Patent number: 11180824
    Abstract: A hot stamped article excellent in strength having a predetermined composition, having an average crystal grain size of prior austenite of 3 ?m or less, containing at least one of lower bainite, martensite, and tempered martensite in an area rate of 90% or more, and having a grain boundary solid solution ratio Z, defined by Z=(mass % of one or both of Nb and Mo at the grain boundaries)/(mass % of one or more of Nb and Mo at time of dissolution) of 0.3 or more.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: November 23, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Yuri Toda, Kazuo Hikida, Shingo Fujinaka, Tomohito Tanaka
  • Patent number: 11155902
    Abstract: A galvanized dual phase steel sheet with a martensite phase and a ferrite phase and a composition containing within the following ranges by weight: carbon from about 0.01% to about 0.18%; manganese from about 0.2% to about 3%; silicon?about 1.2%; aluminum from about 0.01% to about 0.1%; one or both of chromium and nickel from about 0.1% to about 3.5%; calcium from about 0.0003% to about 0.01%; phosphorus?about 0.1%; sulfur?about 0.03%; nitrogen?about 0.02%; molybdenum?about 1%; one or more of niobium and titanium?about 1%; and boron?about 0.006% by weight; and with the balance of the composition being iron and incidental ingredients. The steel sheet may be both galvanized and galvannealed.
    Type: Grant
    Filed: October 2, 2011
    Date of Patent: October 26, 2021
    Assignee: NUCOR CORPORATION
    Inventor: Weiping Sun
  • Patent number: 11104974
    Abstract: Provided is a cold-rolled steel sheet manufactured by a cold-rolled steel sheet manufacturing method comprising a continuous annealing step, which has a composition comprising, by weight %: C: 0.1-0.15%; Si: 0.2% or less (including 0%); Mn: 2.3-3.0%; P: 0.001-0.10%; S: 0.010% or less (including 0%); Sol.Al: 0.01-0.10%; N: 0.010% or less (excluding 0%); Cr: 0.3-0.9%; B: 0.0010-0.0030%; Ti: 0.01-0.03%; Nb:0.01-0.03%; the balance being Fe and other impurities, and satisfies following relationship 1. [relationship 1] 1650?5541.4C+239Mn+169.1Cr+0.74SS-1.36RCS?1688, in which microstructure comprises, in area %, at least 90% of martensite and tempered martensite; and 10% or less of ferrite and bainite, in which the fraction of the tempered martensite in the martensite and the tempered martensite is 90% or more, in area %, and the ratio (b/a) of the C+Mn concentration (a) in the martensite to the C+Mn concentration (b) in the ferrite and the bainite is 0.65 or more.
    Type: Grant
    Filed: December 19, 2016
    Date of Patent: August 31, 2021
    Assignee: POSCO
    Inventors: Min-Seo Koo, Seong-Ho Han
  • Patent number: 11098394
    Abstract: A rolled wire rod wherein the contents of Ti, N, and S (mass %) are respectively [Ti], [N], and [S], and, if [S]?0.0010, [Ti] is (4.5×[S]+3.4×[N]) or more and (0.008+3.4×[N]) or less, while if [S]?0.0010, [Ti] is (4.5×[S]+3.4×[N]) or more and (8.0×[S]+3.4×[N]) or less, the internal structure is a mixed structure of ferrite and pearlite with an area ratio of a ferrite fraction of 40% or more, and a mean area of sulfides present in a range from a surface of the wire rod to a depth position D/8 from the surface of the wire rod is 6 ?m2 or less, wherein D represents a diameter, in mm, in a cross-section of the wire rod at a plane including the axis of the wire rod, and a mean aspect ratio of the sulfides is 5 or less.
    Type: Grant
    Filed: July 5, 2017
    Date of Patent: August 24, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Naoki Matsui, Yutaka Neishi, Makoto Kosaka
  • Patent number: 11098392
    Abstract: A hot rolled steel sheet having a chemical composition containing, by mass %, C: 0.04% or more and 0.20% or less, Si: 0.7% or more and 2.3% or less, Mn: 0.8% or more and 2.8% or less, P: 0.1% or less, S: 0.01% or less, Al: 0.1% or less, N: 0.008% or less, and the balance being Fe and inevitable impurities. The microstructure of the hot rolled steel sheet includes ferrite and pearlites, in which the area ratio of the ferrite is 75% or more and less than 95%, the mean grain size of the ferrite is 5 ?m or more and 25 ?m or less, the area ratio of pearlite is 5% or more and less than 25%, the mean grain size of pearlite is 2.0 ?m or more, and the mean free path of pearlite is 5 ?m or more.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: August 24, 2021
    Assignee: JFE Steel Corporation
    Inventors: Yoshiyasu Kawasaki, Shinjiro Kaneko, Yasunobu Nagataki
  • Patent number: 11085098
    Abstract: Disclosed is a Grade 550 MPa high temperature-resistant pipeline steel, the chemical elements, in mass percentage, being: 0.061%?C?0.120%, 1.70%?Mn?2.20%, 0.15%?Mo?0.39%, 0.15%?Cu?0.30%, 0.15%?Ni?0.50%, 0.035%?Nb?0.080%, 0.005%?V?0.054%, 0.005%?Ti?0.030%, 0.015%?Al?0.040%, 0.005%?Ca?0.035%, and the balance being Fe and unavoidable impurities. Also disclosed is a manufacturing method of the Grade 550 MPa high temperature-resistant pipeline steel, comprising the steps of: smelting, casting, slab heating, rough rolling, finish rolling, controlled cooling, and air cooling to room temperature. The pipeline steel has an excellent mechanical property under a high temperature.
    Type: Grant
    Filed: September 16, 2015
    Date of Patent: August 10, 2021
    Assignee: Baoshan Iron & Steel Co., Ltd
    Inventors: Ping Hu, Lei Zheng, Chuanguo Zhang
  • Patent number: 11085107
    Abstract: A steel sheet has a composition containing, by mass %, C: 0.04% to 0.20%, Si: 0.6% to 1.5%, Mn: 1.0% to 3.0%, P: 0.10% or less, S: 0.030% or less, Al: 0.10% or less, N: 0.010% or less, one, two, or all of Ti, Nb, and V in an amount of 0.01% to 1.0% each, and the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 50% or more of ferrite, in which an average grain diameter at a position located 50 ?m from a surface of the steel sheet in a thickness direction is 3000×(tensile strength TS (MPa))?0.85 ?m or less, C precipitates having a grain diameter of less than 20 nm formed in steel is 0.010 mass % or more, and a amount of precipitated Fe is 0.03 mass % to 1.0 mass %, and a roughness Ra of 3.0 ?m or less.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: August 10, 2021
    Assignee: JFE Steel Corporation
    Inventors: Taro Kizu, Akimasa Kido, Tetsushi Tadani
  • Patent number: 11060157
    Abstract: Provided are coated steel sheets, production methods therefor, and so forth, the coated steel sheets having a tensile strength of 440 MPa or more, good formability, and good aging resistance. A steel sheet of the present invention includes a specific component composition and a steel microstructure having an area fraction of a ferrite phase of 80% or more and 95% or less, an area fraction of pearlite of 5% or more and 20% or less, and an average ferrite grain size of 5 ?m or more and 20 ?m or less, in which in a ferrite grain size histogram, the average grain size of the largest 20% of ferrite grains in terms of grain size is 10 ?m or more, and the pearlite has an average lamellar spacing of 200 nm or less, the area fraction, the average ferrite grain size, and the lamellar spacing being determined by microstructure observation.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: July 13, 2021
    Assignee: JFE STEEL CORPORATION
    Inventors: Noriaki Kohsaka, Yoshimasa Funakawa
  • Patent number: 10934602
    Abstract: A hot rolled flat steel product including (in % by weight) of C: 0.05-0.08%, Si: 0.015-0.500%, Mn: 1.60-2.00%, P: up to 0.025%, S: up to 0.010%, Al: 0.020-0.050%, N: up to 0.006%, Cr: up to 0.40%, Nb: 0.060-0.070%, B: 0.0005-0.0025%, Ti: 0.090-0.130%, unavoidable impurities including up to 0.12% Cu, up to 0.100% Ni, up to 0.010% V, up to 0.004% Mo, and up to 0.004% Sb, and the remainder being iron. The hot rolled flat steel product has a yield strength of 700-850 MPa, a fracture elongation of at least 12%, and a microstructure of at least 70% by volume bainitic microstructure.
    Type: Grant
    Filed: March 6, 2019
    Date of Patent: March 2, 2021
    Assignees: THYSSENKRUPP STEEL EUROPE AG, THYSSENKRUPP AG
    Inventors: Alexander Gaganov, Wolfgang Gervers, Andreas Kern, Gabriel Kolek, Elena Schaffnit, Hans-Joachim Tschersich
  • Patent number: 10907233
    Abstract: Provided are a hot-dip galvanized steel sheet and a hot-dip galvannealed steel sheet with excellent aging-resistance properties and bake hardenability, and a method for manufacturing the same. The hot-dip galvanized steel sheet has a molten zinc plated layer on the surface of a base steel sheet, wherein the base steel sheet comprises: 0.002-0.012 wt % of carbon (C); 1.6-2.7 wt % of manganese (Mn); 0.03 wt % or less (excluding 0 wt %) of phosphorus (P); 0.01 wt % or less (excluding 0 wt %) of sulfur (S); 0.01 wt % or less (excluding 0 wt %) of nitrogen (N); 0.02-0.06 wt % of aluminum (sol.Al); 1.0 wt % or less (excluding 0 wt %) of chromium (Cr), with the remainder being iron and inevitable impurities; the base steel sheet satisfies the relation of 1.3?Mn(wt %)/(1.15×Cr(wt %))?20.5; Mneq defined by relational expression 1 satisfies 1.9?Mneq?3.9.
    Type: Grant
    Filed: June 16, 2016
    Date of Patent: February 2, 2021
    Assignee: POSCO
    Inventors: Sang-Ho Han, Je-Woong Lee
  • Patent number: 10900100
    Abstract: A hot rolled steel sheet having a chemical composition consisting of, in mass %, C: 0.020-0.180%, Si: 0.05-1.70%, Mn: 0.50-2.50%, Al: 0.010-1.000%, N: 0.0060%, P?0.050%, S?0.005%, Ti: 0-0.150%, Nb: 0-0.100%, V: 0-0.300%, Cu: 0-2.00%, Ni: 0-2.00%, Cr: 0-2.00%, Mo: 0-1.00%, B: 0-0.0100%, Mg: 0-0.0100%, Ca: 0-0.0100%, REM: 0-0.1000%, Zr: 0-1.000%, Co: 0-1.000%, Zn: 0-1.000%, W: 0-1.000%, the balance: Fe and impurities, wherein a metal microstructure includes, in area %, at a position ¼ W or ¾ W from an end face of the steel sheet and ¼ t or ¾ t from a surface, martensite: more than 2%-10%, retained austenite <2%, bainite 40%, pearlite 2%, the balance: ferrite, an average circle-equivalent diameter of a metallic phase constituted of martensite/retained austenite is 1.0-5.0 ?m, an average of minimum distances between adjacent metallic phases is 3 ?m or more, and a standard deviation of nano hardness is 2.0 GPa or less.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: January 26, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Tatsuo Yokoi, Nobuo Yoshikawa, Shigeru Yonemura, Kazuya Ootsuka
  • Patent number: 10894996
    Abstract: A hot rolled steel sheet including a chemical composition consisting of, in mass %, C: 0.07-0.22%, Si: 1.00-3.20%, Mn: 0.80-2.20%, Al: 0.010-1.000%, N?0.0060%, P?0.050%, S?0.005%, Ti: 0-0.150%, Nb: 0-0.100%, V: 0-0.300%, Cu: 0-2.00%, Ni: 0-2.00%, Cr: 0-2.00%, Mo: 0-1.00%, B: 0-0.0100%, Mg: 0-0.0100%, Ca: 0-0.0100%, REM: 0-0.1000%, Zr: 0-1.000%, Co: 0-1.000%, Zn: 0-1.000%, W: 0-1.000%, Sn: 0-0.050%, the balance: Fe and impurities, wherein a metal microstructure includes, in area %, at a position ¼ W or ¾ W from an end face of the steel sheet and ¼ t or ¾ t from a surface, retained austenite: more than 2%-10%, martensite ?2%, bainite: 10-70%, pearlite ?2%, the balance: ferrite, an average circle-equivalent diameter of a metallic phase constituted of retained austenite/martensite is 1.0 to 5.0 ?m, an average of minimum distances between adjacent metallic phases is 3 ?m or more, and a standard deviation of nano hardness is 2.5 GPa or less.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: January 19, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Tatsuo Yokoi, Nobuo Yoshikawa, Shigeru Yonemura, Kazuya Ootsuka
  • Patent number: 10851434
    Abstract: A steel sheet for a can having sufficient hardness and a method for manufacturing the steel sheet. The steel sheet has a chemical composition containing, by mass %, C: 0.0005% or more and 0.0030% or less, Si: 0.05% or less, Mn: 0.50% or more and 1.00% or less, P: 0.030% or less, S: 0.020% or less, Al: 0.01% or more and 0.04% or less, N: 0.0010% or more and 0.0050% or less, B: 0.0005% or more and 0.0050% or less, and Fe and inevitable impurities. Additionally, the steel sheet has a hardness (HR30T) of 56 or more, and an average Young's modulus of 215 GPa or more.
    Type: Grant
    Filed: March 23, 2015
    Date of Patent: December 1, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Hayato Saito, Mikito Suto, Katsumi Kojima, Hiroki Nakamaru
  • Patent number: 10844446
    Abstract: A method is provided for fabricating iron castings for metallic components. The method for fabricating the iron castings may include forming a molten solution by melting carbon and iron and combining carbon nanomaterials with the molten solution. A first portion of the carbon nanomaterials combined with the molten solution may be dispersed therein. The method may also include cooling the molten solution to solidify at least a portion of the carbon thereof to fabricate the iron castings. The first portion of the carbon nanomaterials may be dispersed in the iron castings.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: November 24, 2020
    Assignee: DRESSER-RAND COMPANY
    Inventor: Kevin Pickrell
  • Patent number: 10837079
    Abstract: The present invention relates to thin hot-rolled ultrahigh strength steel (UHSS) products, i.e. to hot-rolled steel strips with ultrahigh strength and good bendability. The object of the present invention is to provide an ultrahigh strength hot-rolled steel product that is having yield strength Rp0.2 at least 840 MPa and improved bendability. Further, a preferred aim is also to achieve an ultrahigh strength steel strip with excellent low temperature impact toughness. The inventors of the present invention have surprisingly found that the bendability of directly quenched ultrahigh strength steel strip can be significantly improved by producing a microstructure comprising upper bainite as main phase and by having a hot-rolled steel strip product having a yield strength Rp0.2 at least 840 MPa and a thickness of less than 12 mm, whose composition in percentage by weight is C: 0.03-0.08, Si: 0.01-0.8, Mn: 0.8-2.5, Al: 0.01-0.15, Cr: 0.01-2.0, B: 0.0005-0.005 Nb: 0.005-0.07, Ti: 0.005-0.12, N:<0.01, P:<0.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: November 17, 2020
    Assignee: RAUTARUUKKI OYJ
    Inventors: Tommi Liimatainen, Mikko Hemmilä, Pasi Suikkanen, Juha Erkkilä, Kati Rytinki, Tuomo Saarinen, Teijo Limnell
  • Patent number: 10837080
    Abstract: In a rolled steel bar or rolled wire rod for a cold-forged component having a predetermined chemical composition, Y1 represented by Y1=[Mn]×[Cr] and Y2 represented by Y2=0.134×(D/25.4?(0.50×?[C]))/(0.50×?[C]) satisfy Y1>Y2, the tensile strength is 750 MPa or less, an internal structure is a ferrite-pearlite structure, and the ferrite fraction in the internal structure is 40% or greater. AMOUNT IS 0.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: November 17, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Naoki Matsui, Yutaka Neishi, Tetsushi Chida, Akihisa Obata, Shoji Hori, Keisuke Chiba
  • Patent number: 10829842
    Abstract: In a rolled steel bar or rolled wire rod for a cold-forged component having a predetermined chemical composition, Y1 represented by Y1=[Mn]×[Cr] and Y2 represented by Y2=0.134×(D/25.4?(0.50×?[C])/(0.50×?[C]) satisfy Y1>Y2, the tensile strength is 750 MPa or less, an internal structure is a ferrite-pearlite structure, and the ferrite fraction in the internal structure is 40% or greater.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: November 10, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Naoki Matsui, Yutaka Neishi, Tetsushi Chida, Akihisa Obata, Shoji Hori, Keisuke Chiba
  • Patent number: 10808761
    Abstract: A rolling bearing includes an inner ring, an outer ring, and rolling elements interposed between the inner ring and the outer ring. A surface layer portion, beneath a raceway surface (10a), of a base material of a raceway ring (10) which is the inner ring or the outer ring, is a wear-resistant layer (13) which has a higher hardness than a residual portion (12), beneath the surface layer portion, of the base material, and includes a minute-recess-and-projection surface. An oxide film (14) is provided which has such a film thickness (t) as to fill recesses of the minute-recess-and-projection surface of the wear-resistant layer (13), and includes recesses and projections existing along the minute-recess-and-projection surface, and the oxide film (14) coats the surface of the wear-resistant layer (13). The oxide film (14) is made from a material more fragile than the wear-resistant layer (13) of the base material.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: October 20, 2020
    Assignee: NTN CORPORATION
    Inventors: Weida Yan, Kazumasa Seko, Michio Hori, Takashi Yamamoto, Naoya Hasegawa
  • Patent number: 10801090
    Abstract: The invention discloses an ultra-high obdurability steel plate having a low yield ratio, comprising the chemical elements in mass percentages of: C: 0.18-0.34%, Si: 0.10-0.40%, Mn: 0.50-1.40%, Cr: 0.20-0.70%, Mo: 0.30-0.90%, Nb: 0-0.06%, Ni: 0.50-2.40%, V: 0-0.06%, Ti: 0.002-0.04%, Al: 0.01-0.08%, B: 0.0006-0.0020%, N?0.0060%, O?0.0040%, Ca: 0-0.0045%, and the balance of Fe and other unavoidable impurities. The invention also discloses a process of manufacturing the steel plate, wherein the heating temperature is 1080-1250° C.; the quenching temperature is 860-940° C.; and the tempering temperature is 150-350° C.
    Type: Grant
    Filed: December 24, 2013
    Date of Patent: October 13, 2020
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Sixin Zhao, Hongsheng Jiang, Liandeng Yao
  • Patent number: 10797886
    Abstract: This specification describes techniques for performing blockchain consensus. An example method performed by a first node in a blockchain includes: receiving first service data; determining a corresponding handling time of the first service data; storing the first service data including the corresponding handling time at a cache, in which the cache stores multiple pieces of additional service data, and in which each piece of additional service data is associated with a respective handling time; determining whether a consensus needs to be performed on at least two pieces of service data; in response to determining that the consensus needs to be performed, selecting the at least two pieces of service data according to a sequence that is based on handling times associated with the at least two pieces of service data; and performing the consensus on the more than one pieces of service data according to the sequence.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: October 6, 2020
    Assignee: Alibaba Group Holding Limited
    Inventor: Hao Wu
  • Patent number: 10760150
    Abstract: A martensitic alloy component includes by weight, 0.25% to 0.31% carbon (C), 2.1% to 3.0% manganese (Mn), 0.22% to 0.28% silicon (Si), 2.0% to 2.2% chromium (Cr), 0.45% to 0.55% molybdenum (Mo), 0.08% to 0.12% vanadium (V), and the balance is iron (Fe) and incidental impurities. The manganese-chromium martensitic alloy component has a hardenability corresponding to an ideal diameter of about 15 inches to about 30 inches or more.
    Type: Grant
    Filed: March 23, 2018
    Date of Patent: September 1, 2020
    Assignee: General Electric Company
    Inventor: Theodore Francis Majka
  • Patent number: 10752969
    Abstract: Steel for a suspension spring including, as a chemical composition, by % by mass: C: more than 0.40% and 0.65% or less; Si: 1.00% to 3.50%; Mn: more than 2.00% and 3.00% or less; Cr: 0.01% to 2.00%; V: 0.02% to 0.50%; P: 0.020% or less; S: 0.020% or less: N: 0.0100% or less; and a remainder of Fe and impurities, in which Kf is 280 or more, in which a structure contains a tempered martensite of which an area ratio is 90% or more, in which a Fe-based carbide precipitated in the tempered martensite is a cementite, and in which an average of an area ratios of prior austenite grains which stretch in a longitudinal direction of the steel and of which an aspect ratio exceeds 3.0, is 80% or more in a case of depths of 0.1 mm, 0.2 mm, and 0.3 mm in a sheet thickness direction from a surface of the steel.
    Type: Grant
    Filed: March 10, 2016
    Date of Patent: August 25, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Manabu Kubota, Koichi Banno, Keisuke Chiba, Ryuuichi Seki
  • Patent number: 10711333
    Abstract: Disclosed is a steel sheet having a predetermined chemical composition and a steel microstructure that contains, in area ratio, 15% or more and 55% or less of polygonal ferrite and 15% or more and 30% or less of martensite, and that contains, in volume fraction, 12% or more of retained austenite, in which the polygonal ferrite, the martensite, and the retained austenite have a mean grain size of 4 ?m or less, 2 ?m or less, and 2 ?m or less, respectively, and each have a mean grain aspect ratio of 2.0 or less, and in which a value obtained by dividing an Mn content in the retained austenite in mass % by an Mn content in the polygonal ferrite in mass % equals 2.0 or more.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: July 14, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Yoshiyasu Kawasaki, Hiroshi Matsuda, Takeshi Yokota, Takako Yamashita, Kazuhiro Seto
  • Patent number: 10704118
    Abstract: A predetermined composition is had, when a C content is represented by (C %), in a case of (C %) being not less than 0.35% nor more than 0.65%, a volume fraction of pearlite is 64×(C %)+52% or more, and in a case of (C %) being greater than 0.65% and 0.85% or less, the volume fraction of pearlite is not less than 94% nor more than 100%, and a structure of the other portion is composed of one or two of proeutectoid ferrite and bainite. Further, in a region to a depth of 1.0 mm from a surface, a volume fraction of pearlite block having an aspect ratio of 2.0 or more is not less than 70% nor more than 95%, and a volume fraction of pearlite having an angle between an axial direction and a lamellar direction on a cross section parallel to the axial direction of 40° or less is 60% or more with respect to all pearlite.
    Type: Grant
    Filed: August 11, 2011
    Date of Patent: July 7, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Makoto Okonogi, Shingo Yamasaki, Akifumi Kawana, Hideaki Gotohda
  • Patent number: 10683560
    Abstract: A cold-rolled and recrystallization-annealed flat steel product may include a ferritic microstructure, which possesses optimized formability and suitability for a wide variety of applications, including painting, for example. The flat steel product may include a steel comprising (in percent by weight): C: 0.0001%-0.003%, Si: 0.001%-0.025%, Mn: 0.05%-0.20%, P: 0.001%-0.015%, Al: 0.02%-0.055%, Ti: 0.01%-0.1%. The steel may further include at least one of Cr: 0.001%-0.05%, V: up to 0.005%, Mo: up to 0.015%, or N: 0.001%-0.004%, which may have the following mechanical properties: Rp0.2<180 MPa, Rm<340 MPa, A80<40%, and n value <0.23. At least one surface may have an arithmetic mean roughness Ra of 0.8-1.6 ?m and a peak count RPc of 75/cm. The present disclosure also concerns methods for producing flat steel products.
    Type: Grant
    Filed: September 9, 2015
    Date of Patent: June 16, 2020
    Assignees: ThyssenKrupp Steel Europe AG, ThyssenKrupp AG
    Inventors: Marc Blumenau, Jörg Steinebrunner, Udo Zocher
  • Patent number: 10655199
    Abstract: Provided are a steel sheet, having sufficient strength and formability regardless of reduction of thickness, for crown caps; a method for manufacturing the same; and a crown cap. The steel sheet for crown caps has a composition containing C: 0.0010% to less than 0.0050%, Si: 0.10% or less, Mn: 0.05% to less than 0.50%, P: 0.050% or less, S: 0.050% or less, Al: more than 0.002% to less than 0.070%, N: less than 0.0040%, and B: 0.0005% to 0.0020% on a mass basis, the balance being Fe and inevitable impurities, and also has a yield strength of 500 MPa or more in a rolling direction, an average Lankford value (r) of 1.1 or more, and an in-plane anisotropy (?r) of Lankford value of ?0.3 to 0.3.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: May 19, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Takumi Tanaka, Tomonari Hiraguchi, Katsumi Kojima, Hiroki Nakamaru, Nobusuke Kariya
  • Patent number: 10655196
    Abstract: Provided are an austenitic steel having excellent machinability and ultra-low temperature toughness in a weld heat-affected zone including 15 wt % to 35 wt % of manganese (Mn), carbon (C) satisfying 23.6C+Mn?28 and 33.5C?Mn?23, 5 wt % or less (excluding 0 wt %) of copper (Cu), chromium (Cr) satisfying 28.5C+4.4Cr?57 (excluding 0 wt %), and iron (Fe) as well as other unavoidable impurities as a remainder, wherein a Charpy impact value of a weld heat-affected zone at ?196° C. is 41 J or more, and a method of manufacturing the steel. According to the present invention, a low-cost ultra-low temperature steel may be obtained, a stable austenite phase may be formed at low temperature, carbide formation may be effectively suppressed, and a structural steel having excellent machinability and ultra-low temperature toughness in a weld heat-affected zone may be provided.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: May 19, 2020
    Assignee: POSCO
    Inventors: Soon-Gi Lee, Jong-Kyo Choi, Young-Hwan Park, Hee-Goon Noh, Hyun-Kwan Cho, In-Shik Suh, In-Gyu Park, Hong-Ju Lee
  • Patent number: 10648053
    Abstract: The present invention provides a rolled ferritic stainless steel material excellent in corrosion resistance and toughness, in particular suitable as a material for a flange and a method for producing the same and flange part. The rolled ferritic stainless steel material contains, by mass %, C: 0.001 to 0.08%, Si: 0.01 to 1.0%, Mn: 0.01 to 1.0%, P: 0.01 to 0.05%, S: 0.0002 to 0.01%, Cr: 10.0 to 25.0%, and N: 0.001 to 0.05%, has a balance of Fe and unavoidable impurities, has a thickness of 5 mm or more, and has an area ratio of crystal grains with a <011> direction within 15° from the rolling direction of 20% or more in a cross-section parallel to the rolling direction at any location between the left and right ends of the steel sheet.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: May 12, 2020
    Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
    Inventors: Junichi Hamada, Koji Ito
  • Patent number: 10612106
    Abstract: The present invention provides a cold-rolled and annealed steel sheet with a strength greater than 1200 MPa, the composition of which includes, the contents being expressed by weight: 0.10%?C?0.25%, 1%?Mn?3%, A?0.010%, Si?2.990%, S?0.015%, P?0.1%, N?0.008%, it being understood that 1%?Si+Al?3%, it being understood that Cr+3Mo?0.3%, Ti in an amount such that Ti/N?4 and Ti?0.040%. A balance of the composition includes iron and inevitable impurities resulting from the smelting. The microstructure of the steel includes 15 to 90% bainite, the remainder includes martensite and residual austenite.
    Type: Grant
    Filed: August 22, 2016
    Date of Patent: April 7, 2020
    Assignee: ArcelorMittal
    Inventors: Javier Gil Otin, Antoine Moulin
  • Patent number: 10605374
    Abstract: A valve seat insert made of an iron-base sintered alloy is configured to have a structure in which the base matrix phase is a fine carbide precipitation phase in which a fine carbide being 10 ?m or less in size is precipitated and which has a hardness of 550 HV or more in Vickers hardness; and in the base matrix phase, hard-particles having a hardness of 650-1200 HV in Vickers hardness are dispersed in an area percentage of 20-40%, a diffusional phase is formed in an area percentage of more than 0% and not more than 5%, and solid-lubricant particles are dispersed in an area percentage of 0-5%. Even if a valve having a high face hardness of 400 HV or more, or 600 HV or more is used, a facing valve seat insert wears only slightly, improving valve train durability.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: March 31, 2020
    Assignee: NIPPON PISTON RING CO., LTD.
    Inventors: Seisuke Takaki, Hiroshi Oshige, Ayato Oikawa
  • Patent number: 10597748
    Abstract: Provided is a steel wire rod for wire drawing containing, in terms of % by mass, C: from 0.90 to 1.20%, Si: from 0.10 to 1.30%, Mn: from 0.20 to 1.00%, Cr: from 0.20 to 1.30%, Al: from 0.005 to 0.050%, and the balance being composed of Fe and impurities, wherein a content of each N, P, and S, which are contained as the impurities, is N: from 0.0070% or less, P: from 0.030% or less, S: from 0.010% or less, and the steel wire rod having a metallographic structure of which 95% or more by volume ratio is a lamellar pearlite structure, wherein the lamellar pearlite structure has an average lamellar spacing of from 50 to 75 nm, an average length of cementites in the lamellar pearlite structure is 1.0 to 4.0 ?m, and a percentage of a number of cementites having a length of 0.5 ?m or less among the cementites in the lamellar pearlite structure is 20% or less.
    Type: Grant
    Filed: October 20, 2016
    Date of Patent: March 24, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Toshihiko Teshima, Yoshihiro Daito, Toshiyuki Manabe
  • Patent number: 10590504
    Abstract: A high-strength cold-rolled steel sheet having a specified chemical composition and a microstructure including ferrite having an average crystal grain diameter of 2 ?m or less in an amount of 10% to 25% in terms of volume fraction, retained austenite in an amount of 5% to 20% in terms of volume fraction, martensite having an average crystal grain diameter of 2 ?m or less in an amount of 5% to 15% in terms of volume fraction, and the balance being a multi-phase structure including bainite and tempered martensite having an average crystal grain diameter of 5 ?m or less, in which a relational expression, 0.35?V2/V1?0.75 (1), is satisfied, where V1 is a volume fraction of phases which are different from ferrite and V2 is a volume fraction of tempered martensite.
    Type: Grant
    Filed: October 27, 2015
    Date of Patent: March 17, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Katsutoshi Takashima, Kohei Hasegawa, Yoshimasa Funakawa
  • Patent number: 10578418
    Abstract: A method and apparatus are described for forming a pattern including one or more markings on a substrate. The method includes the step of forming each marking by locally heating the substrate, for example using a fibre laser. A step is also performed of monitoring the temperature of the substrate, e.g. using a temperature sensor, whilst each marking is being formed. The method may be used to form a magnetic encoder scale on a stainless steel substrate having a high content of martensitic material. The local heating causes the martensitic material to be transformed into austenitic material. An encoder scale made using the method is also described.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: March 3, 2020
    Assignees: RLS MERILNA TEHNIKA D.O.O., RENISHAW PLC
    Inventors: Peter Kogej, Matija Jezersek, Janez Mozina, Ales Babnik
  • Patent number: 10570470
    Abstract: A steel sheet for hot stamping includes a predetermined chemical composition containing: C: 0.08% or more and less than 0.20%; Si: 0.003% to 0.2%; Mn: 1.6% to 3.5%, and others, and further includes a steel structure expressed by, in an area ratio: bainite: 1% to 95%; ferrite: 5% to 94%; and balance: one or more selected from the group consisting of pearlite, martensite and retained austenite. When an Mn content is represented by [Mn], a C content is represented by [C], an expression of “[Mn]+6.67×[C]?2.73?0” is satisfied.
    Type: Grant
    Filed: August 15, 2013
    Date of Patent: February 25, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Akari Tamaki, Kazuo Hikida
  • Patent number: 10563357
    Abstract: A rail provided by the present invention includes: has a predetermined chemical components, wherein, in a region from a head surface constituted of a surface of a top head portion and a surface of a corner head portion to a depth of 10 mm, a total amount of pearlite structures and bainite structures is 95% by area or more, and an amount of the bainite structures is 20% by area or more and less than 50% by area, and an average hardness of the region from the head surface to a depth of 10 mm is in a range of Hv 400 to Hv 500.
    Type: Grant
    Filed: May 29, 2015
    Date of Patent: February 18, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Masaharu Ueda, Teruhisa Miyazaki, Takuya Tanahashi
  • Patent number: 10544489
    Abstract: A high-strength steel sheet has a chemical composition including 0.05% to 0.3% of C, 1% to 3% of Si, 0.5% to 3% of Mn, 0% to 0.1% of P, 0.001% to 0.1% of Al, and 0.002% to 0.03% of N, in mass percent; further includes iron and impurities; and has a structure including 50% to 90% of bainitic ferrite, 5% to 20% of retained austenite (?R), a total of 10% to 50% of martensite and the retained austenite, and 0% to 40% of polygonal ferrite, in area percent based on the entire structure. The retained austenite has a carbon content (C?R) of 0.5% to 1.2% by mass, an average equivalent circle diameter of 0.2 to 2 ?m, and an average aspect ratio (maximum diameter/minimum diameter) of less than 3.0. The high-strength steel sheet excels both in elongation and deep drawability while having a strength of 980 MPa or more.
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: January 28, 2020
    Assignee: Kobe Steel, Ltd.
    Inventors: Elijah Kakiuchi, Toshio Murakami, Hideo Hata, Tatsuya Asai, Naoki Mizuta
  • Patent number: 10533969
    Abstract: To predict the iron loss of a non-oriented electrical steel sheet after shearing, a non-oriented electrical steel sheet is sheared to a certain width, and iron loss Wt(B0) of the non-oriented electrical steel sheet after shearing is estimated according to a predetermined relational expression based on iron loss Wn(B1) in a non-machining-affected zone in which no machining strain is introduced by the shearing and iron loss Wi(B2) in a machining affected zone in which machining strain is introduced.
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: January 14, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Takeshi Omura, Yoshiaki Zaizen, Kunihiro Senda
  • Patent number: 10533236
    Abstract: A method of manufacturing a high-strength hot rolled steel sheet by hot rolling a steel having a chemical composition including, by mass %: C: more than 0.010% and not more than 0.06%, Si: not more than 0.3%, Mn: not more than 0.8%, P: not more than 0.03%, S: not more than 0.02%, Al: not more than 0.1%, N: not more than 0.01% and Ti: 0.05 to 0.10%, the balance including Fe and inevitable impurities, including: after the steel is heated to an austenite single phase region, the steel is finish rolled at a finishing delivery temperature of 860° C. to 1050° C., the steel sheet is cooled at an average cooling rate of not less than 30° C./s in a temperature range of from a temperature after the completion of the finish rolling to 750° C., and the steel sheet is coiled into a coil at a coiling temperature of 580° C. to 700° C.
    Type: Grant
    Filed: April 11, 2017
    Date of Patent: January 14, 2020
    Assignee: JFE Steel Corporation
    Inventors: Yoshimasa Funakawa, Tetsuo Yamamoto, Hiroshi Uchomae, Hiroshi Nakano, Taro Kizu
  • Patent number: 10526676
    Abstract: Provided are a high-strength steel sheet, which is suitable as a material of automotive parts, and a method for producing the high-strength steel sheet. In the high-strength steel sheet, the C content is 0.15% or less, the area ratio of ferrite is 8% to 45%, the area ratio of martensite is 55% to 85%, the proportion of martensite grains adjacent to only ferrite grains in the entire microstructure is 15% or less, the average crystal grain sizes of ferrite and martensite are each 10 ?m or less, and the area ratio of ferrite grains having a size of 10 ?m or more to all the ferrite grains included in a portion of the steel sheet which extends from 20 to 100 ?m below the surface thereof is less than 5%.
    Type: Grant
    Filed: November 27, 2014
    Date of Patent: January 7, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Hiroshi Hasegawa, Shinjiro Kaneko, Yoichi Makimizu, Yoshitsugu Suzuki
  • Patent number: 10519525
    Abstract: A high-strength multi-phase steel having tensile strengths of no less than 580 MPa, preferably with a dual-phase structure for a cold-rolled or hot-rolled steel strip having improved forming properties, in particular for lightweight vehicle construction is disclosed, containing the following elements (contents in % by mass): C 0.075 to ?0.105; Si 0.200 to ?0.300; Mn 1.000 to ?2.000; Cr 0.280 to ?0.480; Al 0.10 to ?0.060; P ?0.020; Nb ?0.005 to ?0.025; N ?0.0100; S ?0.0050; the remainder iron, including conventional steel-accompanying elements not mentioned above.
    Type: Grant
    Filed: February 27, 2013
    Date of Patent: December 31, 2019
    Assignee: SALZGITTER FLACHSTAHL GMBH
    Inventors: Thomas Schulz, Andreas Wedemeier, Michael Pohl, Hans-Joachim Kratz, Matthias Geler, Oliver Meyer