Patents Assigned to Posco
  • WIRE ROD FOR HIGH-STRENGTH STEEL FIBER, HIGH-STRENGTH STEEL FIBER, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230031552
    Abstract: Disclosed are a wire rod for a steel fiber having a strength of 1,500 MPa or more without performing LP heat treatment during a wire drawing process, a steel fiber and, a method for manufacturing the same. The wire rod for a high-strength steel fiber according to the present disclosure includes, in percent by weight (wt %), 0.01 to 0.03% of C, 0.05 to 0.15% of Si, 1.0 to 2.0% of Mn, 0.05 to 0.15% of P, 0.005% or less (excluding 0) of Al, 0.01% or less (excluding 0) of N, 0.03% or less (excluding 0) of S, 0.02 to 0.08% of Sn, and the remainder of Fe and inevitable impurities, wherein a microstructure is single-phase ferrite.
    Type: Application
    Filed: November 6, 2020
    Publication date: February 2, 2023
    Applicant: POSCO
    Inventors: Yo-sep YANG, Manjae LEE, Yong-sik PARK
  • STAINLESS STEEL FOR SEPARATOR OF POLYMER FUEL CELL HAVING EXCELLENT CORROSION RESISTANCE
    Publication number: 20230032485
    Abstract: Disclosed is a stainless steel for a separator of a polymer fuel cell having excellent corrosion resistance. More particularly, disclosed is a stainless steel for a separator of a polymer fuel cell having excellent corrosion resistance in a sulfuric acid environment which is a fuel cell operating environment. According to an embodiment, the stainless steel for a separator of a polymer fuel cell includes, in percent by weight (wt %), 0.09% or less of C, 1.0% or more and less than 2.5% of Si, 1.0% or less (excluding 0) of Mn, 0.003% or less of S, 20 to 23% of Cr, 9 to 13% of Ni, 1.0% or less (excluding 0) of W, 0.10 to 0.25% of N, and the remainder of Fe and other inevitable impurities, wherein a corrosion resistance index represented by Formula (1) below is 7 or more. 3*W+1.5*Si+0.1*Cr+20*N?2*Mn??(1) In Formula (1), W, Si, Cr, N, and Mn represent the content (wt %) of each element.
    Type: Application
    Filed: February 10, 2020
    Publication date: February 2, 2023
    Applicant: POSCO
    Inventors: Kwang Min Kim, Bong-Wn Kim, Bo-Sung Seo, Dong-Hoon Kim, Mun-Soo Lee
  • Zinc alloy plated steel material having excellent corrosion resistance after being processed
    Patent number: 11566314
    Abstract: Provided is a plated steel material which can be used for an automobile, a household appliance, a building material, and the like and, more particularly, to a zinc alloy plated steel material having excellent corrosion resistance after being processed and a method for manufacturing the same.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: January 31, 2023
    Assignee: POSCO CO., LTD
    Inventors: Il-Ryoung Sohn, Tae-Chul Kim, Jong-Sang Kim
  • Austenitic steel material having excellent abrasion resistance and toughness and manufacturing method the same
    Patent number: 11566308
    Abstract: Provided according to one preferred aspect of the present invention are austenitic steel material having superb abrasion resistance and toughness, and a method for producing the austenite steel material. The austenitic steel material having superb abrasion resistance and toughness according to one preferred aspect of the present invention comprises, in wt %, 0.6-1.9% carbon (C); 12-22% manganese (Mn); 5% or lower (excluding 0%) chromium (Cr); 5% or lower (excluding 0%) copper (Cu); 0.5% or lower (excluding 0%) aluminum (Al); 1.0% or lower (excluding 0%) silicon (Si); 0.1% or lower (including 0%) phosphorous (P); 0.02% or lower (including 0%) sulfur (S); and the rest in Fe and unavoidable impurities, and has the microstructure comprising, by surface area fraction, 97% or higher (including 100%) austenite and 3% or lower (including 0%) carbide.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: January 31, 2023
    Assignee: POSCO CO., LTD
    Inventors: Yong-Jin Kim, Hong-Yeol Oh, Hong-Ju Lee, Sang-Deok Kang, Yoen-Jung Park, Young-Deok Jung
  • STEEL MATERIAL FOR VACUUM TUBE AND METHOD OF MANUFACTURING SAME
    Publication number: 20230024943
    Abstract: A steel material for a vacuum tube according to an aspect of the present disclosure may include C: 0.1˜0.2%, Si: 0.05?0.5%, Mn: 1.0?1.6%, Ni: 0.5?1.0%, Cr: 1.5?4.0%, and the balance of Fe and unavoidable impurities in percentage by weight, and may have a complex structure of ferrite and pearlite as a microstructure.
    Type: Application
    Filed: December 9, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Hong-Seok YANG, Jae-Hun CHOI, Hak-Jun KIM, Seok-Jong SEO
  • HIGH-STRENGTH FERRITIC STAINLESS STEEL FOR CLAMP, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230025024
    Abstract: Disclosed are high-strength ferritic stainless steel STS430, which has a yield strength of 350 MPa or greater and can be applied to a clamp of a vehicle or a common hose, and a manufacturing method thereof. The high-strength ferritic stainless steel for a clamp, according to one embodiment of the present invention, comprises, by weight, 0.04-0.1% of C, 0.2-0.6% of Si, 0.01-1.5% of Mn, 14.0-18.0% of Cr, 0.005-0.2% of Al, 0.005-0.2% of V, 0.02-0.1% of N, and the remainder as Fe and inevitable impurities, satisfies Expressions (1) and (2), and has at least 2.5×106 precipitates having a mean diameter of 0.5 ?m or less per mm2. (1) 0.35%?Si+Al+V?0.6% (2) 0.09%?C+N?0.
    Type: Application
    Filed: November 11, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Soo-ho Park, Hyunwoong Min, Jae-seok Park
  • ELECTROGALVANIZED STEEL SHEET HAVING SUPERB WHITENESS AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230027626
    Abstract: The present invention provides an electrogalvanized steel sheet and a method manufacturing same, the electrogalvanized steel sheet having superb whiteness, and an attractive exterior surface due to reduction in surface scale.
    Type: Application
    Filed: December 3, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Moon-Jae KWON, Su-Young KIM, Chan-Seok BANG
  • STEEL WIRE ROD HAVING EXCELLENT SPHEROIDIZING HEAT TREATMENT PROPERTIES AND METHOD OF MANUFACTURING SAME
    Publication number: 20230027056
    Abstract: An embodiment of the present invention provides a wire rod and a method of manufacturing same. The wire rod comprises, by weight %, 0.3-0.5 wt % of C, 0.02-0.4 wt % of Si, 1.0-1.5 wt % of Mn, 0.3-0.7 wt % of Cr, 0.003 wt % or less (exclusive of 0 wt %) of B, less than 0.03 wt % (exclusive of 0 wt %) of Ti, 0.03 wt % or less (inclusive of 0 wt %) of P, 0.01 wt % or less (inclusive of 0 wt %) of S, 0.02-0.05 wt % of Al, 0.001-0.01 wt % of N, and the balance being Fe and inevitable impurities, wherein a microstructure is a complex structure having a main phase of ferrite+pearlite, with at least one of bainite or martensite accounting for 5 area % or less (inclusive of 0%), and has a cementite average aspect ratio of 35 or less in an area covering ?-? of the diameter.
    Type: Application
    Filed: December 20, 2019
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Sang-Yoon LEE, In-Gyu PARK, Jae-Seung LEE, Byoung-Gab LEE
  • GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230029310
    Abstract: An exemplary embodiment in the present disclosure provides a grain-oriented electrical steel sheet containing, by wt %: 3.0 to 4.5% of Si; 0.05 to 0.2% of Mn; 0.015 to 0.035% of Al; 0.0015% or less (excluding 0%) of C; 0.0015% or less (excluding 0%) of N; 0.0015% or less (excluding 0%) of S; and a balance of Fe and other unavoidable impurities, wherein the grain-oriented electrical steel sheet satisfies the following Relational Expressions 1 and 2: (W13/50/W17/50)?0.57??[Relational Expression 1] (W15/50/W17/50)?0.76??[Relational Expression 2] where Wx/y represents a core loss value under conditions in which a magnitude of an applied magnetic field is x/10 T and a frequency is y Hz.
    Type: Application
    Filed: December 15, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Chang-Soo Park, Kyu-Seok Han, Jin-Wook Seo, Yu-Jun Bak
  • ADVANCED HIGH STRENGTH ZINC PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND ELECTRICAL RESISTANCE SPOT WELDABILITY AND MANUFACTURING METHOD THEREOF
    Publication number: 20230024115
    Abstract: The present disclosure relates to a high-strength hot-dip galvanized steel sheet having excellent surface quality and electrical resistance spot weldability, and a method for manufacturing the same. A galvanized steel sheet according to an aspect of the present disclosure is a galvanized steel sheet including a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet, wherein a ratio (a/b) of a hardness of a surface layer portion (a) to a hardness of an internal portion (b) of the base steel sheet may be less than 0.95.
    Type: Application
    Filed: December 18, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Ki-Cheol Kang, Chung-Hwan Lee, Yong-Joo Kim, Kang-Min Lee, Kyoo-Young Lee
  • A METHOD FOR CONTROLLING THE SIZE OF LITHIUM PEROXIDE AND A METHOD FOR PREPARING LITHIUM OXIDE WITH CONTROLLED SIZE
    Publication number: 20230025008
    Abstract: The present invention relates to a novel method for preparing lithium oxide. In the present invention, the particle size and shape of lithium oxide may be controlled during the preparing process. In addition, the present invention relates to lithium oxide with controlled particle size and shape prepared by this preparing method.
    Type: Application
    Filed: December 7, 2020
    Publication date: January 26, 2023
    Applicants: POSCO, RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Jae Myung LEE, Jun-Kyu AHN, Woo Chul JUNG, Kee Uek JEUNG, Jung Kwan PARK, Sang Won KIM
  • NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230025678
    Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt%, Si: 2.2 to 4.5 %, Mn: 0.5 % or less (excluding 0 %), AI: 0.001 to 0.5 %, Sn: 0.07 to 0.25 %, and N: 0.0010 to 0.0090 %, and the balance of Fe and inevitable impurities. A surface layer portion existing in an inner direction from a surface of the steel sheet and a central portion existing inside the surface layer portion are included, and the central portion includes N at 0.005 wt% or less, and the surface layer portion further includes N at 0.001 wt% or more compared to the central portion; and the surface layer portion has an average grain size of 60 µm or less, while the central portion has an average grain size of 70 to 300 µm.
    Type: Application
    Filed: December 17, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Hyung Don JOO, Il-Nam YANG, Junesoo PARK, Chang Soo PARK
  • ALUMINUM-BASED ALLOY-PLATED STEEL SHEET HAVING EXCELLENT WORKABILITY AND CORROSION RESISTANCE, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230026159
    Abstract: The present disclosure relates to an aluminum alloy-plated steel sheet having excellent workability and corrosion resistance and a method for manufacturing the same, and more particularly, to an aluminum alloy-plated steel sheet preventing microcracks generated during hot forming and has excellent seizure resistance and corrosion resistance, and a method for manufacturing the same.
    Type: Application
    Filed: December 18, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Suk-Kyu LEE, Hyeon-Seok HWANG, Myung-Soo KIM, Kwang-Tai MIN, Dae-Young KANG
  • STEEL SHEET FOR A STRUCTURE WITH EXCELLENT SEAWATER CORROSION RESISTANCE AND METHOD OF MANUFACTURING SAME
    Publication number: 20230026116
    Abstract: The present invention related to a structural steel sheet having excellent seawater resistance and having excellent corrosion resistance in environments in which corrosion is accelerated by seawater, and a method for manufacturing same.
    Type: Application
    Filed: November 27, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventor: Jin-Ho Park
  • SURFACE TREATMENT COMPOSITION FOR VIBRATION DAMPING STEEL SHEET AND VIBRATION DAMPING STEEL SHEET
    Publication number: 20230023200
    Abstract: The present disclosure is to provide a vibration damping steel sheet having improved vibration damping performance. Provided according to the present disclosure are: a surface treatment composition for a vibration damping steel sheet, comprising a polymer resin and inorganic nano particles having a mean aspect ratio (L/D) of 100 or more; and a vibration damping steel sheet surface-treated with the composition.
    Type: Application
    Filed: October 15, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Jin-Tae Kim, Jung-Hwan Lee, Yeong-Seon Kim, Ha-Na Choi, Yang-Ho Choi
  • FOREIGN SUBSTANCE CAPTURE APPARATUS AND FACILITY FOR MANUFACTURING ELECTRICAL STEEL SHEET INCLUDING SAME
    Publication number: 20230027665
    Abstract: A foreign substance capturing apparatus according to an embodiment of the present invention may comprise: a capturing body unit having an inlet port for introducing the air including magnetic foreign substances and an outlet port for discharging the air from which the magnetic foreign substances have been removed; and a magnetic isolation unit connected to the capturing body unit, including a magnetic member for isolating, by an attractive force, the magnetic foreign substances from the air flowing in the capturing body unit, and provided with a non-magnetic member surrounding the magnetic member.
    Type: Application
    Filed: November 17, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Seong-Cheol Hong, Ki-Young Min, Dong-Geun Kim, Oho-Cheal Kwon, Chang-Ho Kim
  • GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230028520
    Abstract: A method for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises the steps of: hot-rolling a slab to prepare a hot-rolled sheet, the slab containing, in wt %, 2.0 to 6.0% of Si, 0.04 to 0.12% of Mn, 0.001 to 0.022% of N, 0.027 to 0.060% of C, 0.01 to 0.08% of Nb, 0.01% or less of Ti, and the balance of Fe and other inevitable impurities; cold-rolling the hot-rolled sheet to prepare a cold-rolled sheet; and subjecting the primarily recrystallization-annealed cold-rolled sheet to secondary recrystallization annealing.
    Type: Application
    Filed: December 9, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Dae-Hyun SONG, Junesoo PARK, Sang-Woo LEE
  • HIGH-STRENGTH WIRE ROD HAVING HIGH HYDROGEN EMBRITTLEMENT RESISTANCE FOR COLD HEADING, AND METHOD FOR MANUFACTURING THE SAME
    Publication number: 20230029137
    Abstract: Provided are a high-strength wire rod having high hydrogen embrittlement resistance for cold heading, and a method for manufacturing the high-strength wire rod. The high-strength wire rod for cold heading has a chemical composition including, by weight %, C: 0.3% to 0.5%, Si: 0.01% to 0.3%, Mn: 0.3% to 1.0%, Cr: 0.5% to 1.5%, Mo: 0.5% to 1.5%, V: 0.01% to 0.4%, and a balance of Fe and other impurities, and the chemical composition satisfies the relational expression 1. The high-strength wire rod for cold heading has a microstructure including, by area %, 1% to 15% martensite, 0.1% to 5% pearlite, and a balance of bainite, and the fraction of martensite formed along grain boundaries of prior austenite in the martensite of the microstructure is 60% or more.
    Type: Application
    Filed: December 16, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventor: Byung-In JUNG
  • WIRE ROD FOR COLD HEADING HAVING EXCELLENT DELAYED FRACTURE RESISTANCE CHARACTERISTICS, PARTS, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230023191
    Abstract: Provided are a wire rod for cold heading having high resistance to delayed facture, a part having high resistance to delayed facture, and methods for manufacturing the wire rod and the part. The wire rod of the present disclosure has a chemical composition including, by wt %, C: 0.3% to 0.5%, Si: 0.01% to 0.3%, Mn: 0.3% to 1.0%, Cr: 0.5% to 1.5%, Mo: 0.5% to 1.5%, Ni: 0.5% to 2.0%, V: 0.01% to 0.4%, and a balance of Fe and other impurities, and the chemical composition satisfies the relational expression 1, wherein the high-strength wire rod has a microstructure including, by area %, 5% to 20% martensite, 0.1% to 1% pearlite, and a balance of bainite.
    Type: Application
    Filed: December 15, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventor: Byung-In Jung
  • LNG STORAGE TANK AND SHIP HAVING THEREOF
    Publication number: 20230027991
    Abstract: A liquefied gas storage tank according to an embodiment of the present invention may comprise: a tank unit in which liquefied gas is stored; an inner box unit disposed inside the tank unit and installed at the bottom portion of the tank unit; and a pump unit that has an inlet pipe part formed to pass through a lower wall portion of the inner box unit and communicate with the inside of the inner box unit, and suctions the liquefied gas stored in the tank unit through the inlet pipe part, thereby supplying the liquefied gas to the outside.
    Type: Application
    Filed: December 4, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Sang-Hun SON, Myung-Hyun NOH, Eung-Soo KIM