Patents Assigned to Posco
  • High-strength cold rolled steel sheet and galvannealed steel sheet having excellent burring property, and manufacturing method therefor
    Patent number: 12180571
    Abstract: A high strength cold rolled steel sheet having excellent burring properties includes: by weight %, 0.13-0.25% of carbon (C), 1.0-2.0% of silicon (Si), 1.5-3.0% of manganese (Mn), 0.08-1.5% of aluminum (Al)+chromium (Cr)+molybdenum (Mo), 0.1% or less of phosphorus (P), 0.01% or less of sulfur(S), 0.01% or less of nitrogen (N), and the balance of Fe and inevitable impurities; and, by area fraction, 3-25% of ferrite, 20-40% of martensite, 5-20% of residual austenite. The ferrite has an average grain size of 2 ?m or less at the reference point of t/4 (wherein t refers to a steel sheet thickness), with the average ratio between lengths in the thickness direction and in the rolling direction being 1.5 or less.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: December 31, 2024
    Assignee: POSCO CO., LTD
    Inventors: Hang-Sik Cho, Jai-Hyun Kwak
  • Hot rolled steel sheet having excellent crashworthiness and method for manufacturing same
    Patent number: 12180556
    Abstract: Provided are a hot rolled steel sheet having excellent crashworthiness and a method for manufacturing same. The hot rolled steel sheet of the present invention contains, in weight %, 0.05-0.13% of carbon (C), 0.2-2.0% of silicon (Si), 1.3-3.0% of manganese (Mn), 0.01-0.1% of aluminum (Al), 0.001-0.05% of phosphor (P), 0.001-0.05% of sulfur (S), 0.001-0.02% of nitrogen (N), and the balance being Fe and other inevitable impurities, and has a steel microstructure comprising, in area %, 55% or more of bainitic ferrite, 10% or more of a martensite/austenite composite phase (MA), the sum of the bainitic ferrite and the martensite/austenite composite phase (MA) being 95% or more, and the remaining total being less than 5% of granular ferrite, retained austenite, and carbides.
    Type: Grant
    Filed: September 13, 2021
    Date of Patent: December 31, 2024
    Assignee: POSCO CO., LTD
    Inventors: Tae-Jin Song, Sung-Il Kim, Chang-Sik Choi
  • TUBE STRUCTURE
    Publication number: 20240425087
    Abstract: The present invention provides a tube structure comprising: a tube body having therein a movement path along which a traveling body moves; and a reinforcing block that is made of a different material from the tube body and coupled to the tube body along the longitudinal direction of the tube body to reinforce the tube body, wherein the reinforcing block has a contact surface in surface contact with the outer surface of the tube body, and the contact surface extends along the longitudinal direction of the reinforcing block.
    Type: Application
    Filed: September 14, 2022
    Publication date: December 26, 2024
    Applicant: POSCO CO., LTD
    Inventor: Woo-Yeon Cho
  • Austenitic stainless steel having increased yield ratio and manufacturing method thereof
    Patent number: 12173392
    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: Grant
    Filed: July 8, 2020
    Date of Patent: December 24, 2024
    Assignee: POSCO
    Inventors: Seokweon Song, Hak Kim, Mi-nam Park
  • Electrical steel sheet and manufacturing method therefor
    Patent number: 12173390
    Abstract: A manufacturing method of an electrical steel sheet according to an embodiment of the present invention includes: hot-rolling a slab to manufacture a hot-rolled sheet; removing some of scales formed on the hot-rolled sheet and leaving a scale layer having a thickness of 10 nm or more; controlling roughness of the hot-rolled sheet in which the scale layer remains; cold-rolling it to manufacture a cold-rolled sheet; and annealing the cold-rolled sheet.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: December 24, 2024
    Assignee: POSCO CO., LTD
    Inventor: Hyun Jong Kim
  • FERRITIC STAINLESS STEEL AND MANUFACTURING METHOD THEREFOR
    Publication number: 20240417834
    Abstract: Disclosed in the present specification are: a ferritic stainless steel having improved elongation even if batch annealing is omitted; and a manufacturing method therefor. A ferritic stainless steel according to one embodiment of the present invention may comprise, by wt %, 0.01-0.1% of C, 0.01-1.0% of Si, 0.01-1.5% of Mn, P in an amount greater than 0% and less than or equal to 0.05%, S in an amount greater than 0% and less than or equal to 0.005%, 13.0-18.0% of Cr, 0.005-0.1% of N, 0.005-0.2% of Al, 0.05-0.25% of Ni, and the balance of Fe (iron) and other inevitable impurities.
    Type: Application
    Filed: October 20, 2022
    Publication date: December 19, 2024
    Applicant: POSCO CO., LTD
    Inventors: Sooho Park, Jiwoong Jun, Jeehyun Yu, Hoihun Kim
  • SURFACE TREATMENT COMPOSITION FOR TERNARY HOT DIP GALVANIZED STEEL SHEET, SURFACE-TREATED TERNARY HOT DIP GALVANIZED STEEL SHEET USING SAME AND PREPARATION METHOD THEREOF
    Publication number: 20240417860
    Abstract: The objective of the present invention is to provide a surface treatment composition capable of imparting excellent corrosive resistance, blackening resistance, alkali resistance, and an intrinsic surface color property on a ternary hot dip galvanized steel sheet. The present invention provides a surface treatment composition comprising, with respect to 100% by weight of the solid content of the composition: 70-90% by weight of a resin mixture including a high molecular weight polysilicon-modified polyurethane main resin, a low molecular weight polysilicon-modified polyurethane auxiliary resin, and an auxiliary epoxy resin; 0.5-10% by weight of a tarnish inhibitor; 0.5-10% by weight of an adhesion promoter; 0.5-10% by weight of an anticorrosive agent; 0.1-2% by weight of a coloring pigment; and 0.1-1% by weight of a pigment stabilizer.
    Type: Application
    Filed: October 14, 2021
    Publication date: December 19, 2024
    Applicant: POSCO CO., LTD
    Inventors: Soo-Hyoun Cho, Won-Ho Son
  • STEEL PLATE HAVING HIGH STRENGTH AND EXCELLENT LOW-TEMPERATURE IMPACT TOUGHNESS, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20240417836
    Abstract: The present invention pertains to a steel plate and a method for manufacturing same. More specifically, the present invention pertains to a steel plate having high strength and excellent low-temperature impact toughness, and a method for manufacturing same. A steel plate that has excellent strength and low-temperature impact toughness and may be applied as an extremely thick steel material for offshore wind power, and may also be used as a structural steel material for infrastructure industries such as construction and bridges, and a method for manufacturing the same may be provided.
    Type: Application
    Filed: November 29, 2022
    Publication date: December 19, 2024
    Applicant: POSCO CO., LTD
    Inventors: Woo-Gyeom KIM, Sang-Ho KIM, Young-Sub BYUN
  • FERRITIC STAINLESS STEEL WITH EXCELLENT CLAD SHEET WORKABILITY, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20240417832
    Abstract: The present invention relates to a ferritic stainless steel with excellent clad sheet workability, comprising: by wt %, 0.0005-0.02% of C, 0.005-0.02% of N, 0.01-1.0% of Si, 0.01-1.0% of Mn, 0.001-0.05% of P, 10.0-25.0% of Cr, 0.01-0.5% of Nb, 0.01-0.5% of Ti, and the balance of Fe and inevitable impurities, having an average R-bar value of R values for respective directions is at least 1.5, and having a roughness height after sheet cladding of 25 ?m or less. In addition, the present invention relates to a method of manufacturing a ferritic stainless steel. The process involves continuous casting to create a slab with the specified composition, followed by hot rolling at 800-1250° C.; hot annealing same at 900-1050° C., and then cold rolling same with a reduction ratio of 70% or more; and performing final cold annealing at a temperature of 800-950° C. for less than 1 hour.
    Type: Application
    Filed: October 19, 2022
    Publication date: December 19, 2024
    Applicant: POSCO CO., LTD
    Inventors: Jieon PARK, Minam Park
  • Plating weight control device and control method
    Patent number: 12168826
    Abstract: An apparatus for controlling coating weight of a steel sheet by using an air knife includes: an air knife condition derivation unit configured to derive a first air knife gap and a final air knife pressure for target coating weight, and derive a second air knife gap for achieving the target coating weight at a current air knife pressure; and an air knife gap compensation unit configured to determine a final air knife gap according to a gap compensation amount that is a difference between the second air knife gap and the first air knife gap and a gap compensation ratio based on an air knife pressure variation amount for a control period, in which the control period is a period for updating an air knife condition for the target coating weight.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: December 17, 2024
    Assignee: POSCO CO., LTD
    Inventors: Ilhwan Noh, Taein Jang, Won-Ho Lee
  • High-strength cold-rolled steel sheet having excellent bending workability and manufacturing method therefor
    Patent number: 12168810
    Abstract: A high-strength cold-rolled steel sheet having excellent bending workability includes, by weight %, 0.13-0.25% of carbon (C), 1.0-2.0% of silicon (Si), 1.5-3.0% of manganese (Mn), 0.08-1.5% of aluminum (Al)+chromium (Cr)+molybdenum (Mo), 0.1% or less of phosphorus (P), 0.01% or less of sulfur (S), 0.01% or less of nitrogen (N), the remainder of Fe and inevitable impurities, and comprises, by area fraction, 3-25% of ferrite, 20-40% of martensite, and 5-20% of retained austenite, in which a nickel-rich layer formed of nickel (Ni) introduced from the outside is provided on a surface layer portion, and the concentration of nickel (Ni) at a depth of 1 ?m from the surface may be greater than or equal to 0.15 wt %.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: December 17, 2024
    Assignee: POSCO CO., LTD
    Inventors: Hang-Sik Cho, Young-Roc Im
  • ULTRATHICK STEEL MATERIALS FOR FLANGE HAVING EXCELLENT STRENGTH AND LOW TEMPERATURE IMPACT TOUGHNESS, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20240410030
    Abstract: Provided is an ultrathick steel material for a flange having excellent strength and low temperature impact toughness, and a manufacturing method therefor. The steel material of the present disclosure comprises, in weight %, C: 0.05-0.2%, Si: 0.05-0.5%, Mn: 1.0-2.0%, Al: 0.005-0.1%, P: 0.01% or less, S: 0.015% or less, Nb: 0.005-0.07%, V: 0.001-0.3%, Ti: 0.001-0.05%, Cr: 0.01-0.3%, Mo: 0.01-0.12%, Cu: 0.01-0.6%, Ni: 0.05-4.0%, Ca: 0.0005-0.004%, and the balance being Fe and other unavoidable impurities, wherein the steel material has a microstructure having a prior austenite crystallite grain size of 35 ?m or less and including 90 area % or more of at least one of bainite and martensite, and the remainder of ferrite or pearlite.
    Type: Application
    Filed: December 19, 2022
    Publication date: December 12, 2024
    Applicant: POSCO CO., LTD
    Inventors: Dae-Woo KIM, Hong-ju LEE, Dae-Woo BAEK
  • NEGATIVE ELECTRODE ACTIVE MATERIAL FOR RECHARGEABLE LITHIUM BATTERY, METHOD FOR MANUFACTURING SAME, AND RECHARGEABLE LITHIUM BATTERY INCLUDING SAME
    Publication number: 20240413331
    Abstract: It is related to a manufacturing method of a negative electrode active material for lithium secondary battery, comprising: preparing an artificial graphite; mixing the artificial graphite and a coal tar to form a coating layer on the artificial graphite; and carbonizing the artificial graphite on which the coating layer is formed, wherein, the artificial graphite has a degree of sphericity of 0.6 to 1; and in the step of preparing an artificial graphite, the artificial graphite contains 20 wt % or more of artificial graphite derived from coal-based coke.
    Type: Application
    Filed: December 20, 2021
    Publication date: December 12, 2024
    Applicants: POSCO Holdings Inc., RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY, POSCO CHEMICAL CO., LTD
    Inventors: Gang Ho LEE, Jung-Chul AN, Sei Min PARK, Jong Hoon YOON, Hyun-Chul JO
  • PLATED STEEL SHEETS FOR HOT PRESS FORMING HAVING EXCELLENT HYDROGEN BRITTLENESS RESISTANCE AND IMPACT RESISTANCE, HOT PRESS FORMED PARTS, AND MANUFACTURING METHODS THEREOF
    Publication number: 20240410028
    Abstract: Provided are plated steel sheets for hot press forming, hot press formed parts, and manufacturing methods thereof, the plated steel sheets comprising: a base steel sheet comprising, in weight %, C: 0.07 to 0.5%, Si: 0.05 to 1%, Mn: 0.5 to 5%, P: 0.001 to 0.015%, S: 0.0001 to 0.02%, Al: 0.01 to 0.18, Cr: 0.01 to 1%, N: 0.001 to 0.02%, Ti: 0.1% or less, B: 0.01% or less, Sn: 0.01 to 0.1%, and a balance of Fe and inevitable impurities; an aluminum or aluminum alloy plating layer disposed on at least one surface of the base steel sheet; and an Sn-enriched layer provided between the base steel sheet and the plating layer, wherein the Sn-enriched layer satisfies a specific relationship.
    Type: Application
    Filed: August 5, 2024
    Publication date: December 12, 2024
    Applicant: POSCO CO., LTD
    Inventors: Jin-Keun Oh, Seong-Woo Kim, Sang-Heon Kim, Hyo-Sik Chun
  • Method of preparing lithium compound
    Patent number: 12162774
    Abstract: This disclosure relates to a method of preparing a lithium compound that includes preparing a lithium phosphate, mixing the lithium phosphate with sulfuric acid to obtain a mixture, converting the lithium phosphate into lithium sulfate through a reaction in the mixture, and separating the lithium sulfate in a solid phase, wherein in the step of converting the lithium phosphate into lithium sulfate through the reaction in the mixture, a sum concentration ([P+S] mol/L) of phosphorus (P) and sulfur (S) in a liquid phase of the mixture is greater than or equal to 5 mol/L.
    Type: Grant
    Filed: September 29, 2017
    Date of Patent: December 10, 2024
    Assignees: POSCO CO., LTD, RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Juyoung Kim, Ki Young Kim, Woo Chul Jung, Kwang Seok Park, Hyunwoo Lee, Woonkyoung Park, Sang Won Kim, Jung Kwan Park, Heok Yang, Sung Kook Park, Seung Taek Kuk
  • Electrical steel sheet and method for manufacturing same
    Patent number: 12163066
    Abstract: An embodiment of the present invention provides an electrical steel sheet including: an upper adhesive layer positioned on an upper surface of an electrical steel sheet; and an lower adhesive layer positioned on a lower surface of the electrical steel sheet, wherein the upper adhesive layer has a pencil hardness of F or lower, and the lower adhesive layer has a pencil hardness of H or higher.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: December 10, 2024
    Assignee: POSCO Co., Ltd
    Inventors: Bongwoo Ha, Jung-Woo Kim, Taeyoung No, Dong-Gyu Lee
  • HOT-ROLLED FERRITIC STAINLESS STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING SAME
    Publication number: 20240401165
    Abstract: The present invention pertains to a hot-rolled ferritic stainless steel sheet having excellent formability, which has an R-bar value of at least 1.08 and satisfies TS/YS?1.5 representing the ratio of tensile strength (TS) to yield strength (YS) after a steel, containing 0.001-0.1% of C, 10.0-14.0% of Cr, 0.001-0.5% of Ti, 0.001-0.5% of Nb, 0.001-1.5% of Ni, 0.001-1.5% of Mn, 0.001-1.0% of Cu, 0.001-2.0% of Si, 0.001-0.1% of N, and 0.1% or less of Al, with the remainder comprising Fe and inevitable impurities, is hot-rolled and then pre-rolled at a reduction ratio of 30% or more.
    Type: Application
    Filed: October 26, 2022
    Publication date: December 5, 2024
    Applicant: POSCO CO., LTD
    Inventors: Junghyun Kong, Jinsuk Kim, Nayeon Chu
  • PLATED STEEL SHEET HAVING EXCELLENT PLATING ADHESION AND CORROSION RESISTANCE AFTER HOT PRESS FORMING, PREPARATION METHOD FOR PLATED STEEL SHEET, AND HOT PRESSED FORMING MEMBER
    Publication number: 20240401173
    Abstract: The present disclosure relates to a plated steel sheet for hot press forming, having excellent paint adhesion and corrosion resistance after hot press forming; a preparation method for the plated steel sheet; and a hot press formed member. The plated steel sheet according to an aspect of the present disclosure comprises a base steel sheet and a plating layer consisting of Al—Fe alloy formed on the base steel sheet, wherein the sum of contents of Al and Fe in the plating layer is 80% or more by weight, the average content of Fe in the plating layer is 20% or more by weight, and the product of Ra and RPC of the surface of the plating layer may be 60-150 ?m/cm. Here, Ra represents arithmetic mean roughness and the unit thereof is ?m, and RPc represents the number of peaks per unit length and the unit thereof is /cm.
    Type: Application
    Filed: December 20, 2022
    Publication date: December 5, 2024
    Applicant: POSCO CO., LTD
    Inventors: Jin-Keun Oh, Seong-Woo Kim, Sea-Woong Lee, Sang-Heon Kim, Jae-Seong Park, Ru-Ri Lee
  • ULTRAHIGH-STRENGTH STEEL SHEET HAVING EXCELLENT YIELD RATIO, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20240401166
    Abstract: One aspect of the present invention relates to an ultrahigh-strength steel sheet having an excellent yield ratio, comprising, by wt %, 0.3-0.5% of C, 2.0% (excluding 0%) of Si, 3.0-6.5% of Mn, 0.02% or less of P, 0.01% or less of S, 0.01-3.0% of Al, 0.02% or less (excluding 0%) of N, and the balance of Fe and other inevitable impurities, and a microstructure comprises 5-30% of remaining austenite by area fraction and comprises 5% or less of secondary martensite.
    Type: Application
    Filed: August 9, 2024
    Publication date: December 5, 2024
    Applicants: POSCO CO., LTD, POSTECH ACADEMY-INDUSTRY FOUNDATION
    Inventors: Sea-Woong LEE, Bruno C. DE COOMAN, Kyoo-Young LEE, Eun-Jung SEO, Seon-Jong LEE, Joo-Hyun RYU, Won-Hwi LEE
  • HIGH-STRENGTH AND THICK STEEL SHEET HAVING EXCELLENT HOLE EXPANDABILITY AND DUCTILITY, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20240401164
    Abstract: The present invention relates to steel suitable as a material for an automotive structural member and particularly, to a high-strength and thick steel sheet having a low yield ratio and high strength, excellent formability and collision resistance due to excellent hole expandability through improved ductility, and a method thereof.
    Type: Application
    Filed: September 21, 2022
    Publication date: December 5, 2024
    Applicant: POSCO CO., LTD
    Inventors: Kyoung-Rae Cho, Sung-Kyu Kim, Jun-Ho Park, Sang-Ho Han, Jeong-Hun Kim