Patents Assigned to Posco
  • Hot-rolled steel sheet having excellent durability and method for manufacturing same
    Patent number: 11535908
    Abstract: The present invention relates to steel used for a sash component and the like of a vehicle and, more specifically, to a hot-rolled steel sheet having excellent durability and a method for manufacturing same, the hot-rolled steel sheet having no cracks formed on a material and a welding heat-affected zone (HAZ) even after pipemaking and molding due to a smaller decrease in the strength of the welding heat-affected zone formed during electric resistance welding in comparison with the strength of the material (base material).
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: December 27, 2022
    Assignee: POSCO HOLDINGS INC.
    Inventors: Hyun-Taek Na, Seok-Jong Seo
  • NORMALIZING HEAT-TREATED STEEL SHEET HAVING GOOD LOW-TEMPERATURE IMPACT TOUGHNESS AND METHOD FOR MANUFACTURING SAME
    Publication number: 20220403479
    Abstract: A normalizing heat-treated steel sheet having good low-temperature impact toughness and a method for manufacturing the same is provided. The normalizing heat treated steel sheet of the present invention contains, by weight %, C: 0.04 to 0.1%, Si: 0.05 to 0.5%, Mn: 1.0 to 2.0%, Sol. Al: 0.015 to 0.04%, Nb: 0.003 to 0.03%, Ti: 0.005 to 0.02%, Cu: 0.35% or less, Ni: 0.05 to 0.8%, N: 0.002 to 0.008%, P: 0.01% or less (excluding 0%), S: 0.003% or less, and a balance of Fe and unavoidable impurities and has a steel microstructure composed of 70 to 90 area % of polygonal ferrite having a grain size of 20 ?m or less, and 10 to 30 area % of spheroidized pearlite.
    Type: Application
    Filed: November 27, 2020
    Publication date: December 22, 2022
    Applicant: POSCO
    Inventors: Woo-Gyeom Kim, Dae-Woo Baek, Ki-Ho Yun
  • HIGH-PERMEABILITY FERRITE-BASED STAINLESS STEEL
    Publication number: 20220403488
    Abstract: Disclosed is a high-permeability ferrite-based stainless steel. According to an embodiment, the disclosed high-permeability ferrite-based stainless steel includes, in percent by weight (wt %), 0.0005 to 0.02% of C, 0.005 to 0.02% of N, 0.2 to 2.0% of Si, 10.0 to 25.0% of Cr, 0.05 to 0.5% of Nb, and the remainder of Fe and other inevitable impurities, wherein a Nb/(C+N) value satisfies a range of 5 to 20 and a <001>//RD texture fraction is 5% or more.
    Type: Application
    Filed: July 8, 2020
    Publication date: December 22, 2022
    Applicant: POSCO
    Inventors: Jieon Park, Hyung-gu Kang, Kyung-hun Kim
  • AUSTENITIC STAINLESS STEEL HAVING INCREASED YIELD RATIO AND MANUFACTURING METHOD THEREOF
    Publication number: 20220403491
    Abstract: Disclosed is an austenitic stainless steel having an increased yield ratio. The disclosed austenitic stainless steel is characterized by comprising, in percent by weight (wt %), 0.1% or less (exclusive of 0) of C, 0.2% or less (exclusive of 0) of N, 1.5 to 2.5% of Si, 6.0 to 10.0% of Mn, 15.0 to 17.0% of Cr, 0.3% or less (exclusive of 0) of Ni, 2.0 to 3.0% of Cu, and the remainder of Fe and other inevitable impurities, and satisfying Expressions (1) and (2) below. 3.2?5.53+1.4Ni?0.16Cr+17.1(C+N)+0.722Mn+1.4Cu?5.59Si?7??Expression (1): 551-462(C+N)?9.2Si?8.1Mn?13.7Cr?29(Ni+Cu)?110??Expression (2): wherein C, N, Si, Mn, Cr, Ni, and Cu indicate the content (wt %) of respective elements.
    Type: Application
    Filed: July 8, 2020
    Publication date: December 22, 2022
    Applicant: POSCO
    Inventors: Seokweon Song, Hak Kim, Mi-nam Park
  • Highly corrosion-resistant plated steel sheet having excellent plating adhesion and resistance to liquid metal embrittlement
    Patent number: 11530470
    Abstract: Provided is a highly corrosion-resistant plated steel sheet having plating adhesion and resistance to liquid metal embrittlement. A highly corrosion-resistant plated steel sheet comprises a base steel sheet and a plated layer, which sequentially comprises an Fe—Al alloy layer and an MgZn2 layer from an interface with the base steel sheet.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: December 20, 2022
    Assignee: POSCO CO., LTD
    Inventors: Il-Jeong Park, Myung-Soo Kim, Suk-Kyu Lee
  • Steel sheet plated with Al—Fe for hot press forming having excellent corrosion resistance and spot weldability, and manufacturing method thereof
    Patent number: 11529795
    Abstract: The present invention provides a steel sheet plated with aluminum-iron and a preparation method therefor, the steel sheet comprising: a base steel sheet; and a plated layer formed on the surface of the base steel sheet and comprising: an alloyed layer containing at least one of Fe3Al, FeAl(Si), Fe2Al5, and FeAl3; and an aluminum layer formed on the alloyed layer and having a thickness less than 10% of that of the plated layer, wherein the plated layer is 20-35 ?m in thickness and contains 1-20 wt % of Mg as measured by GDS at a position 0.1 ?m deep from the surface of the plated layer and 10 wt % of oxygen as measured by GDS at a position 0.1 ?m deep from the surface of the plated layer.
    Type: Grant
    Filed: November 29, 2019
    Date of Patent: December 20, 2022
    Assignee: POSCO HOLDINGS INC.
    Inventors: Jin-Keun Oh, Seong-Woo Kim, Sang-Heon Kim, Yeol-Rae Cho
  • Grain-oriented electrical steel sheet and manufacturing method therefor
    Patent number: 11530462
    Abstract: The present invention relates to a grain-oriented electrical steel sheet including 2.0 to 6.0 wt % of Si, 0.01 wt % or less (excluding 0 wt %) of C, 0.01 wt % or less (excluding 0 wt %) of N, and 0.005 to 0.1 wt % of Co, and including a balance of Fe and other inevitable impurities.
    Type: Grant
    Filed: December 17, 2018
    Date of Patent: December 20, 2022
    Assignee: POSCO HOLDINGS INC.
    Inventors: Dae-Hyun Song, June Soo Park, Il-Nam Yang
  • FERRITIC STAINLESS STEEL HAVING IMPROVED MAGNETIZATION, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20220396849
    Abstract: Disclosed is a ferritic stainless steel having improved magnetization including, in percent by weight (wt %), 0.01% or less (excluding 0) of C) 0.003% or less (excluding 0) of N, 15 to 18% of Cr, 0.3 to 1.0% of Mn, 0.2 to 0.3% of Si, 0.005% or less (excluding 0) of Al, 0.005% or less (excluding 0) of Ti, and the balance of Fe and inevitable impurities, and satisfying the following equation, (Ti+Al+8*(C+N)/Mn)?0.3??Equation (1) (wherein Ti, Al, C, N, and Mn denote amounts (wt %) of the respective elements).
    Type: Application
    Filed: November 18, 2020
    Publication date: December 15, 2022
    Applicant: POSCO
    Inventors: Kye-man Lee, Hyung-gu Kang
  • REINFORCING MEMBER FOR COLD FORMING AND PARTS MANUFACTURED USING SAME
    Publication number: 20220395886
    Abstract: A reinforcing member for cold forming according to an embodiment comprises: a blank member; and a reinforcing patch member provided to cover at least a portion of the blank member and coupled to the blank member by a plurality of welded portions, wherein the entire region of a heat-affected zone formed around the welded portions in the blank member is positioned in a region corresponding to the reinforcing patch member, and a heat-affected zone formed around a first welded portion from among the welded portions may contact the central point of a second welded portion adjacent to the first welded portion or may be formed to be spaced apart from the central point of the second welded portion.
    Type: Application
    Filed: November 13, 2020
    Publication date: December 15, 2022
    Applicant: POSCO
    Inventor: Kyung-Seok Oh
  • CATHODE ACTIVE MATERIAL, PREPARATION METHOD THEREFOR AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    Publication number: 20220388852
    Abstract: The present exemplary embodiments relate to a cathode active material, a manufacturing method thereof, and a lithium secondary battery including the same. A cathode active material according to an exemplary embodiment is a lithium metal oxide particle in the form of a secondary particle including a primary particle, a coating layer including a boron compound is positioned on at least a portion of a surface of the primary particle, and the boron compound includes an amorphous structure.
    Type: Application
    Filed: August 13, 2020
    Publication date: December 8, 2022
    Applicants: POSCO, RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY, POSCO CHEMICAL CO., LTD
    Inventors: Sang Cheol NAM, Kwon Young CHOI
  • METHOD FOR MANUFACTURING STAINLESS STEEL FOR POLYMER FUEL CELL SEPARATOR
    Publication number: 20220393188
    Abstract: Disclosed is a method for manufacturing a stainless steel for a polymer electrolyte membrane fuel cell separator, and more particularly, a method for manufacturing a stainless steel for a polymer electrolyte membrane fuel cell separator capable of obtaining low contact resistance and high corrosion resistance by effectively removing a non-conductive coating and forming a new coating. According to an embodiment, the disclosed method for manufacturing a stainless steel for a polymer electrolyte membrane fuel cell separator includes performing alternating current electrolysis by immersing, in a sulfuric acid solution, a stainless steel having a passivation coating formed on a surface thereof by cold rolling and bright annealing, wherein the alternating current electrolysis is performed by applying a current density of 10 to 30 A/dm2.
    Type: Application
    Filed: February 12, 2020
    Publication date: December 8, 2022
    Applicant: POSCO
    Inventors: Young Jun Kim, Bo-Sung Seo, Kwang Min Kim, Dong-Hoon Kim
  • GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME
    Publication number: 20220389532
    Abstract: According to an exemplary embodiment of the present invention, a method for manufacturing a grain-oriented electrical steel sheet includes: a step of hot-rolling a slab to manufacture a hot-rolled steel sheet; a step of performing hot-rolled sheet annealing on the hot-rolled steel sheet; a step of performing primary cold-rolling on the hot-rolled sheet annealed hot-rolled steel sheet; a step of performing primary decarburization annealing on the primarily cold-rolled steel sheet; a step of performing secondary cold-rolling on the decarburization-annealed steel sheet; a step of performing secondary decarburization annealing on the secondarily cold-rolled steel sheet; and a step of performing continuous annealing on the secondarily decarburization-annealed steel sheet.
    Type: Application
    Filed: December 17, 2020
    Publication date: December 8, 2022
    Applicant: POSCO
    Inventors: Hyun-Seok Ko, Hongwook Jung, Se-Min Park, Jin-Wook Seo
  • COLD-ROLLED STEEL PLATE FOR HOT FORMING, HAVING EXCELLENT CORROSION-RESISTANCE AND SPOT-WELDABILITY, HOT-FORMED MEMBER, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20220389533
    Abstract: An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4?0.4*Cr+Si?3.
    Type: Application
    Filed: August 11, 2022
    Publication date: December 8, 2022
    Applicant: POSCO
    Inventors: Jin-Keun OH, Yeol-Rae CHO, A-Ra CHO, Jin-Ho CHA, Si-Myoung HEO, Jeong-Won SEO, Seong-Woo KIM
  • BATTERY CASE AND MOTOR VEHICLE COMPRISING SAME
    Publication number: 20220393286
    Abstract: The battery case according to one embodiment may comprise: a base plate member; a support member which surrounds the base plate member, has a closed cross-section, and supports the base plate member; and an absorption member which is coupled to the outside of the support member so as to form a closed cross-section and absorbs external impacts.
    Type: Application
    Filed: November 11, 2020
    Publication date: December 8, 2022
    Applicants: POSCO, ASAN CO., LTD.
    Inventors: Myung-Hwan CHA, Sang-Kwon WEE, Don-Gun KIM, Geun-Ho KIM, Seong-Min CHO, Kyu-Rae KIM, Seung-Ho YOO
  • HIGH STRENGTH WIRE ROD HAVING NON-MAGNETIC PROPERTY AND METHOD FOR MANUFACTURING THEREOF
    Publication number: 20220389530
    Abstract: The present invention relates to a wire rod used as a material for a core wire for a power line and, more specifically, to a wire rod having both high strength and a non-magnetic property, and a method for manufacturing same.
    Type: Application
    Filed: October 6, 2020
    Publication date: December 8, 2022
    Applicant: POSCO
    Inventors: Bong-Keun Lee, Sung-Hoon Chung
  • HIGH-STRENGTH STEEL HAVING HIGH YIELD RATIO AND EXCELLENT DURABILITY, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20220389548
    Abstract: Thick high-strength steel having a high yield ratio and excellent durability, and a method for manufacturing same are provided. The thick high-strength steel having a high yield ratio and excellent durability of the present invention comprises, in percentage by weight, C: 0.05 to 0.15%, Si: 0.01 to 1.0%, Mn: 1.0 to 2.3%, Al: 0.01 to 0.1%, Cr: 0.005 to 1.0%, P: 0.001 to 0.05%, S: 0.001 to 0.01%, N: 0.001 to 0.01%, Nb: 0.005 to 0.07%, Ti 0.005 to 0.11%, Fe and unavoidable impurities.
    Type: Application
    Filed: October 26, 2020
    Publication date: December 8, 2022
    Applicant: POSCO
    Inventors: Sung-Il Kim, Hyun-Taek Na
  • High-strength steel having excellent low-yield-ratio characteristics, and manufacturing method therefor
    Patent number: 11519045
    Abstract: A high-strength steel having excellent low-yield-ratio characteristics, according to one embodiment of the present invention, comprises, by wt %, 0.06-0.12% of C, 0.2-0.5% of Si, 1.5-2.0% of Mn, 0.003-0.05% of Al, 0.01% or less of N, 0.02% or less of P, 0.003% or less of S, 0.05-0.5% of Cr, 0.05-0.5% of Mo, 0.01-0.05% of Nb, 0.0005-0.005% of Ca and the balance of Fe and other inevitable impurities, and comprises polygonal ferrite as a microstructure, wherein the area fraction of the polygonal ferrite is 10-30% and the average hardness of the polygonal ferrite can be 180 Hv or less.
    Type: Grant
    Filed: December 24, 2018
    Date of Patent: December 6, 2022
    Assignee: POSCO
    Inventor: Hwan-Gyo Jung
  • Hot-rolled steel sheet with excellent low-temperature toughness, steel pipe, and manufacturing method therefor
    Patent number: 11519060
    Abstract: A preferable aspect of the present invention provides a hot-rolled steel sheet with excellent low-temperature toughness, a steel pipe using the same, and a manufacturing method therefor, wherein the hot-rolled steel sheet contains, by weight, 0.35-0.65% C, 0.01-0.4% Si, 13-26% Mn, 0.01-0.3% Ti, 0.01% or less B, 4% or less Al, 1-6% Cr, 0.05% or less P, 0.02% or less S, 0.01% or less N, 0.01-2% Cu, 0.001-0.015% Nb, and the balance Fe and other unavoidable impurities, the alloy elements satisfying the following relational formulas—[Relational formula 1] 70<[10*(C/12)+(Mn/55)+(Al/27)]*100<95 and [Relational formula 2] 4<100*(Cr/52+100*(Nb/93))<9; wherein a microstructure comprises, by area fraction, 97% or more (including 100%) of austenite and 3% or less (including 0%) of a carbide, the crystal grain size of the austenite being 18-30 ?m or less; and wherein the size of the carbide is 0.5 ?m or less.
    Type: Grant
    Filed: October 4, 2018
    Date of Patent: December 6, 2022
    Assignee: POSCO HOLDINGS INC.
    Inventor: Jin-Ho Bae
  • High-strength steel sheet having excellent processability and method for manufacturing same
    Patent number: 11519051
    Abstract: Provided is a high-strength steel sheet having a tensile strength of 780 MPa or higher. The high-strength steel sheet has a low yield ratio and excellent ductility (El) and strain hardening exponent (n) and thus has enhanced processability.
    Type: Grant
    Filed: October 11, 2018
    Date of Patent: December 6, 2022
    Assignee: POSCO Co., Ltd
    Inventors: Yeon-Sang Ahn, Chang-Hyo Seo, Kang-Hyun Choi, Eul-Yong Choi
  • Wire rod with excellent strength and ductility and manufacturing method therefor
    Patent number: 11512365
    Abstract: Disclosed are a wire rod and a manufacturing method therefor, the wire rod comprising, by weight %: 0.05-0.20% of C, 0.2% or less of Si, 5.0-6.0% of Mn, 0.020% or less of P, 0.020% or less of S, 0.010-0.050% of Al, 0.010-0.020% of N, and a balance of Fe and inevitable impurities and having a microcrystalline structure composed of two phases of austenite and ferrite, wherein the austenite has an area fraction of 15-25%.
    Type: Grant
    Filed: November 23, 2017
    Date of Patent: November 29, 2022
    Assignee: POSCO
    Inventors: Hyong-Jik Lee, Yum-Ho Choi