Patents Assigned to Posco
  • QT HEAT TREATED HIGH CARBON HOT ROLLED STEEL SHEET, HIGH CARBON COLD ROLLED STEEL SHEET, QT HEAT TREATED HIGH CARBON COLD ROLLED STEEL SHEET, AND MANUFACTURING METHODS THEREOF
    Publication number: 20240076766
    Abstract: Provided are a QT heat treated high carbon hot rolled steel sheet, a high carbon cold rolled steel sheet, a QT heat treated high carbon cold rolled steel sheet, and manufacturing methods thereof, wherein the QT heat treated high carbon hot rolled steel sheet comprises, in weight %, C: 1.0-1.4%, Si: 0.1-0.4%, Mn: 0.1-0.8%, Cr: 0.3-11%, W: 0.05-2.5%, P: 0.03% or less, S: 0.03% or less, Al: 0.02% or less, and the balance being Fe and other inevitable impurities, the average size of carbides being 0.1-20 ?m.
    Type: Application
    Filed: December 10, 2021
    Publication date: March 7, 2024
    Applicant: POSCO Co., Ltd
    Inventors: Sun-Mi KIM, Jae-Hun CHOI, Hak-Jun KIM
  • Stainless steel for fuel cell separator plate and manufacturing method therefor
    Patent number: 11923580
    Abstract: Stainless steel for a fuel cell separator plate and a manufacturing method therefor are disclosed. The stainless steel for a fuel cell separator plate, according to one embodiment of the present invention, comprises: a stainless base material; and a passive film formed on the stainless base material, wherein a Cr/Fe atomic weight ratio in a 1 nm or less thickness region of the stainless base material, which is adjacent to an interface between the stainless and the passive film, is 0.45 or more. Therefore, by modifying the surface of the stainless steel for a fuel cell separator plate, a low interface contact resistance and a good corrosion resistance can be obtained, and a separate additional process such as precious metal coating can be removed, such that manufacturing costs are reduced and productivity can be improved.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: March 5, 2024
    Assignee: POSCO CO., LTD
    Inventors: Kwang Min Kim, Jong Hee Kim, Ki Hoon Jo, Bo Sung Seo
  • Method of manufacturing hot press-formed member having excellent productivity, weldability and formability
    Patent number: 11919062
    Abstract: An method of manufacturing a hot press-formed member comprises heating a blank of an aluminum-based plated steel sheet in a heating furnace, removing the heated blank from the heating furnace and conveying the removed blank between an upper mold portion and a lower mold portion of a mold, mounted on a press, to be seated; and performing a forming process after the upper mold portion of the mold is in contact with the seated blank.
    Type: Grant
    Filed: January 19, 2023
    Date of Patent: March 5, 2024
    Assignee: POSCO CO., LTD
    Inventors: Hong Gee Kim, Hyun Sung Son
  • Low-density clad steel sheet having excellent strength and plateability, and manufacturing method therefor
    Patent number: 11913089
    Abstract: Provided is a density clad steel sheet having excellent strength and plateability, the clad steel sheet including a base metal, and a clad material provided at both sides of the base metal, wherein the base metal is a ferrite-austenitic duplex lightweight steel sheet comprising, by wt %, 0.3-0.7% of C, 2.0-9.0% of Mn, 4.5-8.0% of Al and the balance of Fe and inevitable impurities, and the clad material is a ferrite carbon steel comprising, by wt %, 0.0005-0.2% of C, 0.05-2.5% of Mn and the balance of Fe and inevitable impurities.
    Type: Grant
    Filed: July 25, 2019
    Date of Patent: February 27, 2024
    Assignee: POSCO CO., LTD
    Inventors: Min-Seo Koo, Tae-Jin Song
  • POSITIVE ACTIVE MATERIAL FOR RECHARGEABLE LITHIUM BATTERY, METHOD OF PREPARING SAME, AND RECHARGEABLE LITHIUM BATTERY INCLUDING SAME
    Publication number: 20240063385
    Abstract: The present exemplary embodiments provide a positive electrode active material, a manufacturing method thereof, and a lithium secondary battery including the same. The positive electrode active material according to an exemplary embodiment is a metal oxide particle including a center and a surface portion positioned on the surface of the center, but the metal oxide particle is composed of a single particle, and the surface portion includes a film in which no peak is observed during XRD measurement.
    Type: Application
    Filed: December 13, 2021
    Publication date: February 22, 2024
    Applicants: POSCO Holdings Inc., RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Sang Cheol NAM, Kwon Young CHOI, Jung Hoon SONG, Sang Hyuk LEE
  • WIRE ROD AND PART WITH IMPROVED DELAYED FRACTURE RESISTANCE, AND METHODS FOR MANUFACTURING SAME
    Publication number: 20240060162
    Abstract: Disclosed are wire rods and parts with improved delayed fracture resistance, and methods for manufacturing the same. The wire rod with improved delayed fracture resistance according to the present disclosure contains, by wt %, 0.15-0.30% of C, 0.15-0.25% of Si, 0.95-1.35% of Mn, 0.030% or less of P, 0.030% or less of S, 0.015-0.030% of Ti, 0.0010-0.0040% of B, 0.0010-0.0080% of N, and Fe and inevitable impurities as the balance, and satisfies formula 1 of 2.0?5.5×[Si]+[Mn]?2.4, where [Si] and [Mn] represent the contents (wt %) of the corresponding elements.
    Type: Application
    Filed: December 14, 2021
    Publication date: February 22, 2024
    Applicant: POSCO CO., LTD
    Inventors: Youngsoo CHUN, Sang-yoon LEE, Seok-hwan CHOI, Myungsoo CHOI
  • Alloy coated steel sheet
    Patent number: 11905587
    Abstract: The present invention relates to an alloy-coated steel sheet comprising: a steel sheet, and Al—Mg—Si—Zn alloy layer positioned on the steel sheet, wherein the Al—Mg—Si—Zn alloy layer comprises a Mg—Zn alloy phase, and wherein the Mg—Zn alloy phase comprises MgZn2 and Mg2Zn11, and the Mg—Zn alloy phase further comprises at least one of MgZn, Mg21Zn25, Mg51Zn20 and Mg2Zn3.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: February 20, 2024
    Assignees: POSCO CO., LTD, RESEARCH INSTITUTTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Ji Hoon Yang, Jae In Jeong, Kyung Hwang Lee, Yong Hwa Jung, Tae Yeob Kim
  • Wire rod for cold heading, processed product using same, and manufacturing methods therefor
    Patent number: 11905571
    Abstract: The present disclosure relates to a CHQ wire rod that has improved resistance to hydrogen delayed fracture while securing cold forging characteristics by reducing Si content and adding Mo and V, a processed product using the same, and a manufacturing method thereof. In accordance with an aspect of the present disclosure, a CHQ wire rod includes, in percent (%) by weight of the entire composition, C: 0.3 to 0.5%, Si: 0.1 to 0.3%, Mn: 0.5 to 1.0%, at least two or more of Cr: 0.5 to 1.5%, Mo: 0.5 to 1.5%, V: 0.01 to 0.2%, the remainder of iron (Fe) and other inevitable impurities, and the value of the following formula (1) is 3.56 or more.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: February 20, 2024
    Assignee: POSCO CO., LTD
    Inventors: Byung-In Jung, Sang-Yoon Lee, Han Hwi Kim
  • Manufacturing method of aluminum-based alloy plated steel
    Patent number: 11904572
    Abstract: The present disclosure relates to an aluminum-based plated steel that is provided for vehicles by hot forming, an aluminum-based alloy plated steel manufactured using the same, and method of manufacturing thereof.
    Type: Grant
    Filed: March 14, 2023
    Date of Patent: February 20, 2024
    Assignee: POSCO CO., LTD
    Inventors: Jin-Keun Oh, Il-Ryoung Sohn, Seong-Woo Kim, Jeom-Soo Shin
  • NEGATIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, METHOD FOR PREPARING SAME, AND LITHIUM SECONDARY BATTERY COMPRISING SAME
    Publication number: 20240055586
    Abstract: The present embodiments relate to a negative electrode active material for a lithium secondary battery, a method for preparing the same, and a lithium secondary battery comprising the same. The negative electrode active material for a lithium secondary battery, according to one embodiment, comprises a silicon-carbon composite comprising silicon nanoparticles and a carbon matrix, and can have a degree of oxidation that is less than or equal to 10.5%.
    Type: Application
    Filed: December 21, 2021
    Publication date: February 15, 2024
    Applicants: POSCO Holdings Inc., RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Seung Jae YOU, Sun Jong PARK, Eun-Tae KANG, Yong Jung KIM, Jung Gyu WOO, Moonkyu CHO, Sangeun PARK
  • HIGH-STRENGTH WIRE ROD FOR COLD HEADING WITH SUPERIOR HEAT TREATMENT CHARACTERISTICS AND RESISTANCE OF HYDROGEN-DELAYED FRACTURE CHARACTERISTICS, HEAT-TREATED COMPONENT, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20240052467
    Abstract: Disclosed in the present specification are: a high-strength wire rod for cold heading, having superior heat treatment characteristics and resistance of hydrogen-delayed fracture characteristics, the rod being applicable to a bolt, etc.; a heat-treated component; and a method for manufacturing the same. According to an exemplary embodiment, the high-strength wire rod for cold heading with superior heat treatment characteristics and resistance of hydrogen-delayed fracture characteristics comprises, by wt %, 0.3-0.6% of C, 0.05-0.3% of Si, 0.2-1.0% of Mn, 0.5-2.0% of Cr, 0.5-2.0% of Mo, 0.02-0.05% of Al, 0.01-0.03% of N, and Fe and other impurities as the balance, and has a microstructure comprising, by area fraction, 80% or more of bainite, 1-15% of pearlite and 0.1-2% of martensite, and comprises 2×1019/m3 or more of aluminum nitride having a diameter of 5-50 nm.
    Type: Application
    Filed: November 18, 2021
    Publication date: February 15, 2024
    Applicant: POSCO CO., LTD
    Inventors: Byung-in JUNG, Hanhwi KIM
  • CATHODE ACTIVE MATERIAL FOR LITHIUM SECONDARY BATTERY, AND LITHIUM SECONDARY BATTERY INCLUDING SAME
    Publication number: 20240055592
    Abstract: It is related to a positive electrode active material for lithium secondary battery, and to a lithium secondary battery containing the same. To improve the battery characteristics of high-capacity positive electrode materials by simultaneously doping tungsten (W) element, which has an excellent effect on electrical conductivity, and boron (B) element, which is positioned on the surface to suppress the negative reaction of residual lithium and electrolyte solution.
    Type: Application
    Filed: October 2, 2019
    Publication date: February 15, 2024
    Applicants: POSCO, RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Junghoon KIM, Chang Joo HAN, Young Sang KIM, Sang Cheol NAM, Geun HWANGBO
  • HIGH-STRENGTH COLD-ROLLED ENAMEL STEEL SHEET WITH EXCELLENT ADHESION, AND METHOD OF MANUFACTURING SAME
    Publication number: 20240052452
    Abstract: The present invention relates to a high-strength cold-rolled enamel steel sheet and a method of manufacturing same, the enamel steel sheet comprising, in weight %, C:0.01-0.1%, Mn:0.05-0.4%, Si:0.001-0.03%, Al:0.03-0.12%, P:0.02-0.04%, S:0.001-0.02%, Cu: 0.03-0.08%, Mo:0.13-0.30%, N: 0.004% or less, 0:0.003% or less, and the balance being Fe and inevitable impurities, wherein the high-strength cold-rolled enamel steel sheet has an oxide layer with a thickness of 0.006-0.030 ?m formed in an inward direction from the surface thereof and satisfies formulas (1) and (2), and thus has no bubble defects and excellent fish scale resistance and enamel adhesion after enamel treatment.
    Type: Application
    Filed: December 15, 2021
    Publication date: February 15, 2024
    Applicant: POSCO Co., Ltd
    Inventor: Jaiik Kim
  • GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME
    Publication number: 20240052463
    Abstract: A grain oriented electrical steel sheet according to an embodiment of the present invention comprises: an electrical steel sheet base comprising 2.0 to 7.0 weight % of Si and 0.01 to 0.07 weight % of Sb, and the remainder being Fe and other unavoidable impurities; a fine-grained interfacial layer positioned in a direction toward the inside of the electrical steel sheet base from the surface of the electrical steel sheet base; a base coating layer positioned on the fine-grained interfacial layer; and an insulating coating layer positioned on the base coating layer. The grain oriented electrical steel sheet according to an embodiment of the present invention satisfies Formula 1 below. ([P]×[PS]+[F]×[FS]+[C]×[CS])/?([S]/2)?13.
    Type: Application
    Filed: December 15, 2021
    Publication date: February 15, 2024
    Applicant: POSCO Co., Ltd
    Inventors: Minserk Kwon, Woncheol Chung, Hokyung Shim, Changsoo Park, Seonghoon Min
  • STEEL SHEET FOR SEISMIC DAMPER HAVING SUPERIOR TOUGHNESS PROPERTY AND MANUFACTURING METHOD OF SAME
    Publication number: 20240052451
    Abstract: The present invention relates to: a steel sheet for a seismic damper used to provide a structure with seismic resistance against earthquakes; and a manufacturing method of same, and more specifically, to a steel sheet which is for a seismic damper and has a superior toughness property, and a manufacturing method of same.
    Type: Application
    Filed: November 30, 2021
    Publication date: February 15, 2024
    Applicant: POSCO CO., LTD
    Inventors: Jae-Young CHO, Sang-Deok KANG, Kyung-Tae KIM
  • WIRE ROD AND STEEL WIRE FOR SPRING, SPRING WITH IMPROVED FATIGUE RESISTANCE AND NITRIDING PROPERTIES, AND METHODS FOR MANUFACTURING SAME
    Publication number: 20240052453
    Abstract: Disclosed are a wire rod and a steel wire for a spring, a spring with improved fatigue resistance and nitriding property, and methods for manufacturing same. The wire rod for a spring with improved fatigue resistance and nitriding property according to the present disclosure contains, by wt %, 0.6-0.7% of C, 2.0-2.5% of Si, 0.2-0.5% of Mn, 0.9-1.6% of Cr, 0.015% of less of P, 0.01% of less of S, 0.01% of less of Al, 0.007% of less of N, 0.1-0.25% of Mo, 0.1-0.25% of V, and Fe and inevitable impurities as the balance, wherein Cr+Mn is 1.8% or less, Mo/V is 1.5 or less, and the microstructure includes 60% or more of a pearlite structure in the C section.
    Type: Application
    Filed: November 18, 2021
    Publication date: February 15, 2024
    Applicant: POSCO CO., LTD
    Inventors: Junmo LEE, Seok-hwan CHOI, Myungsoo CHOI
  • LAMINATED IRON CORE AND MANUFACTURING METHOD THEREOF
    Publication number: 20240051264
    Abstract: The present disclosure relates to a method for manufacturing an electrical steel sheet laminate, the method comprising the steps of: preparing an electrical steel sheet strip including an adhesive layer; coating the strip with a fusion accelerator including a silane coupling agent, a curing agent, and a solvent; fabricating metal parts from the strip; and laminating the metal parts and attaching same to each other by compression.
    Type: Application
    Filed: December 17, 2021
    Publication date: February 15, 2024
    Applicant: POSCO Co., Ltd
    Inventors: Jungwoo KIM, Bongwoo HA, Donggyu LEE, Taeyoung NO, Gyeongryeol PARK
  • ALUMINUM ALLOY-PLATED STEEL SHEET HAVING EXCELLENT WORKABILITY AND CORROSION RESISTANCE AND METHOD FOR MANUFACTURING SAME
    Publication number: 20240052495
    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 that prevents 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: February 15, 2024
    Applicant: POSCO
    Inventors: Suk-Kyu Lee, Hyeon-Seok Hwang, Myung-Soo Kim, Jong-Gi Oh, Kwang-Tai Min
  • COMPOSITE STEEL SHEET HAVING EXCELLENT ADHESIVENESS, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20240052519
    Abstract: The present invention relates to a composite steel sheet having excellent adhesiveness, and a manufacturing method therefor, and, more particularly, to a light composite steel sheet obtained by forming microstructures on the surface and inside of a plated steel sheet, and then bonding same with a plastic layer to maximize adhesiveness.
    Type: Application
    Filed: December 9, 2021
    Publication date: February 15, 2024
    Applicant: POSCO Co., Ltd
    Inventors: Hye-Jin Yoo, Chang-Se Byeon, Jung-Su Kim, Je-Hoon Baek, Kang-Min Lee
  • COMPOSITION FOR SURFACE TREATMENT OF STEEL SHEET AND STEEL SHEET USING THE SAME
    Publication number: 20240052496
    Abstract: A composition for surface treatment capable of imparting to a steel sheet, plate corrosion resistance, corrosion resistance of processed parts, pit corrosion resistance, blackening resistance, pipe forming oil infiltration, and alkali resistance, and improving foreign-matter defects; and a steel sheet using the same. The composition for surface treatment of a steel sheet includes a trivalent chromium compound; and adhesiveness improving agent containing a silane compound; an acidity modifier including acids; a crosslinking agent containing a silicate compound; a vanadium-based pit corrosion-improving agent; a polymer resin; and a solvent.
    Type: Application
    Filed: December 17, 2021
    Publication date: February 15, 2024
    Applicants: POSCO Co., Ltd, UNICOH Speciality Chemicals Co., Ltd
    Inventors: Changhoon Choi, Jongkook Kim, Hocheol Song