Patents Assigned to Posco
  • Austenitic stainless steel having excellent pipe-expandability and age cracking resistance
    Patent number: 11959159
    Abstract: The austenitic stainless steel that does not cause defects such as aging crack or delayed fracture even after the expansion and curling process of 5 steps or more is disclosed. In accordance with an aspect of the present disclosure, an austenitic stainless steel with excellent pipe expanding workability and aging crack resistance includes, in percent (%) by weight of the entire composition, C: 0.01 to 0.04%, Si: 0.1 to 1.0%, Mn: 0.1 to 2.0%, Cr: 16 to 20%, Ni: 6 to 10%, Cu: 0.1 to 2.0%, Mo: 0.2% or less, N: 0.035 to 0.07%, the remainder of iron (Fe) and other inevitable impurities, and the C+N satisfies 0.1% or less, the product of the Md30 (° C.) value and average grain size (?m) satisfies less than ?500.
    Type: Grant
    Filed: August 22, 2019
    Date of Patent: April 16, 2024
    Assignee: POSCO CO., LTD
    Inventors: Sang Seok Kim, Deok Chan Ahn, Mi-Nam Park, Hyun Woong Min, Yung Min Kim
  • STEEL WIRE WITH IMPROVED DRAWABILITY, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20240117459
    Abstract: A steel wire with improved drawability, and a manufacturing method therefor are disclosed. A steel wire according to the present invention comprises, by wt %, 0.52-0.69% of C, 0.3-0.8% of Mn, 0.1-0.5% of Si, and the balance of Fe and inevitable impurities, wherein the carbon content of cementite in pearlite is 7 at. % or more, and the following formula (1) is satsified. [TS]+exp(?)*10<1500??(1) In Expression (1), [TS] means the tensile strength (MPa) of a wire before drawing, and e means draw strain.
    Type: Application
    Filed: November 18, 2021
    Publication date: April 11, 2024
    Applicant: POSCO CO., LTD
    Inventor: Choongyeol LEE
  • High-strength stainless steel
    Patent number: 11952649
    Abstract: A stainless steel with a yield strength of 2,200 MPa or more is disclosed through the generation of the strain-induced martensite phase and the increase of the martensite phase strength. A high strength stainless steel according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.14 to 0.20%, Si: 0.8 to 1.0%, Mn: more than 0 and 0.5% or less, Cr: 15.0 to 17.0%, Ni: 4.0 to 5.0%, Mo: 0.6 to 0.8%, Cu: 0.5% or less, N: 0.05 to 0.11%, the remainder of iron (Fe) and other inevitable impurities, and C+N: 0.25% or more and Md30 value satisfies 40° C. or more.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: April 9, 2024
    Assignee: POSCO CO., LTD
    Inventors: Jong Jin Jeon, Mi-Nam Park, Sang Seok Kim
  • Zinc-plated steel sheet for hot pressing having outstanding surface characteristics, hot-pressed moulded parts obtained using the same, and a production method for the same
    Patent number: 11952652
    Abstract: Provided is a method of manufacturing a zinc-plated steel sheet. The method includes: coating a metal on the steel sheet on a steel sheet; annealing the metal coated steel sheet; and zinc plating the annealed steel sheet by dipping in a molten zinc plating bath. Further provided is a method of manufacturing a hot-press part including: coating a metal on the steel sheet on a steel sheet; annealing the metal coated steel sheet; zinc plating the annealed steel sheet by dipping in a molten zinc plating bath; heating the zinc-plated steel sheet; and press forming the heated steel sheet.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: April 9, 2024
    Assignee: POSCO CO., LTD
    Inventors: Il-Ryoung Sohn, Jong-Sang Kim, Joong-Chul Park, Yeol-Rae Cho, Jin-Keun Oh, Han-Gu Cho, Bong-Hoon Chung, Jong-Seog Lee
  • HIGH-STRENGTH STEEL MATERIAL HAVING EXCELLENT LOW-TEMPERATURE STRAIN AGAIN IMPACT PROPERTIES AND METHOD FOR MANUFACTURING SAME
    Publication number: 20240110267
    Abstract: The present invention relates to a steel material for pressure vessels, offshore structures and the like and, more specifically, to a high-strength steel material having excellent low-temperature strain aging impact properties and a method for manufacturing same.
    Type: Application
    Filed: December 12, 2023
    Publication date: April 4, 2024
    Applicant: POSCO CO., LTD
    Inventors: Kyung-Keun Um, Woo-Gyeom Kim, Hong-Ju Lee
  • Ferritic stainless steel and ferritic stainless steel pipe with improved mechanical properties of welding portion
    Patent number: 11946125
    Abstract: A ferritic stainless steel with improved mechanical properties of weld zone is disclosed. The ferritic stainless steel includes, in percent (%) by weight of the entire composition, C: 0.005 to 0.02%, N: 0.005 to 0.02%, Cr: 11.0 to 13.0%, Ti: 0.16 to 0.3%, Nb: 0.1 to 0.3%, Al: 0.005 to 0.05%, the remainder of iron (Fe) and other inevitable impurities, and the ferritic stainless steel has a texture maximum strength of 30 or less in the {001} direction after welding.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: April 2, 2024
    Assignee: POSCO CO., LTD
    Inventors: Kye-Man Lee, Jae-Seok Park
  • Annealing separating agent composition for grain-oriented electrical steel sheet, grain-oriented electrical steel sheet, and method for manufacturing grain oriented electrical steel sheet
    Patent number: 11946114
    Abstract: Provided is an annealing separating agent composition for a grain-oriented electrical steel sheet, a grain-oriented electrical steel sheet and a method for manufacturing a grain-oriented electrical steel sheet. The annealing separating agent composition for a grain-oriented electrical steel sheet according to an embodiment of the present invention contains 30 to 70% by weight of a calcium compound, and the remainder of magnesium oxide or magnesium hydroxide on a solid basis.
    Type: Grant
    Filed: December 14, 2021
    Date of Patent: April 2, 2024
    Assignee: POSCO CO., LTD
    Inventors: Min Serk Kwon, Tae Young No, Chang Soo Park, Heon-Jo Choi
  • CHROMIUM STEEL HAVING EXCELLENT HIGH-TEMPERATURE OXIDATION RESISTANCE AND HIGH-TEMPERATURE STRENGTH, AND METHOD OF MANUFACTURING SAME
    Publication number: 20240102136
    Abstract: Provided are chromium steel having excellent high-temperature oxidation resistance and high-temperature strength, and a method of manufacturing same. The present invention relates to chromium steel, having excellent high-temperature oxidation resistance and high-temperature strength, which comprises, by weight %, 0.1% or less of C (not including 0%), 0.7% or less of Si (not including 0%), 0.1% or less of Mn (not including 0%), 0.01% or less of S (not including 0%), 0.03% or less of P (not including 0%), 27-33% of Cr, 3.5% or less of Al (not including 0%), 2.5% or less of Nb (not including 0%), 6.5% or less of W (not including 0%), 0.5% or less of Mo (not including 0%), 0.3% or less of Ti (not including 0%), 0.015% or less of N (not including 0%) and the remainder being Fe and unavoidable impurities, and satisfies relational expression (1).
    Type: Application
    Filed: September 25, 2020
    Publication date: March 28, 2024
    Applicant: POSCO
    Inventor: Hyun-Je Sung
  • STEEL PLATE FOR PRESSURE VESSEL HAVING EXCELLENT RESISTANCE TO HIGH-TEMPERATURE POST-WELDING HEAT TREATMENT, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20240102137
    Abstract: The purpose of the present invention is to provide a steel plate for a pressure vessel having excellent resistance to high-temperature post-welding heat treatment, in which deterioration of strength and toughness is minimized even when a long-term post welding heat treatment (PWHT) is applied at high temperature, and a method for manufacturing same.
    Type: Application
    Filed: October 20, 2020
    Publication date: March 28, 2024
    Applicant: POSCO
    Inventor: Soon-Taik Hong
  • Solution composition for surface treatment of steel sheet and surface-treated steel sheet using same
    Patent number: 11939489
    Abstract: Provided is a composition for surface treatment of a steel sheet, the composition having excellent resistance to an acid, such as sulfuric acid, and to a coated steel sheet to which the composition for surface treatment is applied, wherein the composition for surface treatment comprises 30-50% wt % of colloidal silica containing 5-20 nm-sized silica, 40-60% wt % of silane containing three or more alkoxy groups, 5-15 wt % of an acrylate-based organic monomer, 0.01-1 wt % of an acid, and 1-15 wt % of a solvent.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: March 26, 2024
    Assignees: POSCO CO., LTD, NOROO COIL COATINGS CO., LTD.
    Inventors: Chang-Hoon Choi, Dong-Yun Kim, Min-Ho Jo, Jae-Duck Ko, Won-Ho Son, Jong-Hwa Kim
  • Al—Fe-alloy plated steel sheet for hot forming, having excellent TWB welding characteristics, hot forming member, and manufacturing methods therefor
    Patent number: 11939651
    Abstract: Provided is an Al—Fe-alloy plated steel sheet for hot forming, having excellent TWB welding characteristics since excellent hardness uniformity of a TWB weld zone after hot forming is obtained by suitably controlling a batch annealing condition, after plating Al, such that an Al—Fe-alloy layer is formed; a hot forming member; and manufacturing methods therefor.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: March 26, 2024
    Assignee: POSCO CO., LTD
    Inventors: Seong-Woo Kim, Jin-Keun Oh, Yeol-Rae Cho, Hyeon-Jeong Shin
  • Ultra-high-strength hot-rolled steel sheet, steel pipe, member, and manufacturing methods therefor
    Patent number: 11939639
    Abstract: A preferable aspect of the present invention provides: an ultra-high-strength hot-rolled steel sheet containing, by weight, one or two of 0.40-0.60% of C, 0.7-1.5% of Mn, 0.3% or less (excluding 0%) of Si, 0.03% or less (including 0%) of P, 0.004% or less (including 0%) of S, 0.04% or less (excluding 0%) of Al, 0.3% or less (excluding 0%) of Cr, 0.3% or less (excluding 0%) of Mo, 0.9-1.5% of Ni, and 0.9-1.5% of Cu, 1.1% or more of Cu+Ni, 0.04% or less (excluding 0%) of Ti, 0.005% or less (excluding 0%) of B, 0.006% or less (excluding 0%) of N, and the balance Fe and other impurities, the alloy elements satisfying relational formulas 1 and 2 below, wherein a microstructure of the hot-rolled steel sheet comprises, by volume, 7% or more of ferrite and 93% or less of perlite; a steel pipe and a member each using the same; and manufacturing methods therefor.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: March 26, 2024
    Assignee: POSCO CO., LTD
    Inventors: Hwan-Goo Seong, Yeol-Rae Cho, Seong-Beom Bae
  • PRESSURE VESSEL STEEL PLATE HAVING EXCELLENT HIGH TEMPERATURE PWHT RESISTANCE AND METHOD FOR MANUFACTURING SAME
    Publication number: 20240093326
    Abstract: The present invention relates to a pressure vessel steel plate having excellent high temperature PWHT resistance, comprising: 0.10-0.16 weight % C; 0.20-0.35 weight % Si; 0.4-0.6 weight % Mn; 7.5-8.5 weight % Cr; 0.7-1.0 weight % Mo; 0.005-0.05 weight % Al; 0.015 weight % or less P, 0.002 weight % or less S; 0.001-0.025 weight % Nb; and 0.25-0.35 weight % V, with the remainder being Fe and unavoidable impurities.
    Type: Application
    Filed: November 15, 2021
    Publication date: March 21, 2024
    Applicant: POSCO CO., LTD
    Inventor: Soon-Taik HONG
  • UNCONSTRAINED VIBRATION DAMPING METAL SHEET WITH FOAM PORES AND METHOD FOR MANUFACTURING SAME
    Publication number: 20240092060
    Abstract: Provided is an unconstrained vibration damping metal sheet with foam pores. The unconstrained vibration damping metal sheet of the present invention comprises: a metal sheet; an organic-inorganic pretreatment layer containing an acrylic resin formed on the metal sheet; and a foam resin layer formed on the pretreatment layer, the foam resin layer containing, based on weight % thereof, a thermoplastic polyvinyl chloride resin: 40-80%, a plasticizer: 5-40%, a foaming agent: 0.1-10%, an oxide-based crosslinker: 1-4%, and spherical silica: 1-10%.
    Type: Application
    Filed: November 30, 2021
    Publication date: March 21, 2024
    Applicant: POSCO Co., Ltd
    Inventors: Jin-Tae Kim, Dae-Gyu Kang, Yang-Ho Choi, Jung-Hwan Lee
  • PLATED STEEL WIRE AND MANUFACTURING METHOD FOR THE SAME
    Publication number: 20240093341
    Abstract: A plated steel wire, according to one aspect of the present invention, comprises: a base steel wire; and a zinc alloy plated layer. The zinc alloy plated layer comprises, in percentage by weight: 1.0% to 3.0% of AI; 1.0% to 2.0% of Mg; 0.5% to 5.0% of Fe; and the balance being Zn and unavoidable impurities, and includes a Zn/MgZn2/AI ternary eutectic structure, a Zn single-phase structure, and an Fe—Zn-AI-based crystal structure, wherein the Fe—Zn-AI-based crystal structure is formed adjacent to the base steel wire, and can have an average thickness of ? to ½ with respect to an average thickness of the zinc alloy plated layer.
    Type: Application
    Filed: November 27, 2023
    Publication date: March 21, 2024
    Applicants: POSCO CO., LTD, KISWIRE LTD., HONGDUK INDUSTRIAL CO., LTD.
    Inventors: Tae-Chul Kim, Jong-Sung Kim, Sung-Hoon Kang, Gwang-Weon Yu, Il-Ryoung Sohn, Jong-Sang Kim
  • Filtering panel and photovoltaic module including same
    Patent number: 11935980
    Abstract: A filtering panel includes a molding layer part; a pattern layer part having an incident surface through which light emitted from a light source and viewing light transmitted to an observer enter, and an accommodation surface which is the reverse surface of the incident surface, wherein the molding layer part is stacked on the incident surface so as to be adjacent thereto, and the pattern layer part adjusts the optical paths of the emitted light and the viewing light; and a filtering layer part formed on a lower incident surface of the pattern layer part having the incident surface of the viewing light that enters from a lower region below a horizontal reference line, wherein the reflectivity of the visible light in the viewing light incident on the lower region is made greater than that of an upper region above the reference line by means of mirror reflection.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: March 19, 2024
    Assignees: POSCO CO., LTD, RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Sung-Ju Tark, Kun-Hoon Baek, Jun-Hong Kim, Youn-Joung Choi, Ji-Sang Park
  • Manufacturing apparatus for lithium sulfate and manufacturing method therefor
    Patent number: 11932549
    Abstract: It is introduced that a device of manufacturing lithium sulfate comprising: a reaction body in which a reaction of lithium phosphate and sulfuric acid is performed, the reaction body being divided into an upper space and a lower space; a pressurizer for applying pressure to the inside of the reaction body; a stirrer disposed in the upper space for stirring the lithium phosphate and sulfuric acid to produce a mixture containing lithium sulfate and phosphoric acid; and a filter disposed inside the reaction body and separating the filtrate containing the phosphoric acid into the lower space by filtering the mixture.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: March 19, 2024
    Assignees: POSCO CO., LTD, RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Juyoung Kim, Ki Young Kim, Woonkyoung Park, Jung Kwan Park, Woo Chul Jung, Kwang Seok Park, Hyun Woo Lee, Sang Won Kim, Heok Yang, Seung Taek Kuk
  • ALUMINUM-IRON-PLATED STEEL SHEET, HAVING EXCELLENT MOLD WEAR RESISTANCE, FOR HOT PRESS FORMING, AND MANUFACTURING METHOD THEREOF
    Publication number: 20240084429
    Abstract: The present invention provides an aluminum-iron-plated steel sheet, having excellent mold wear resistance, for hot press forming, and a manufacturing method thereof.
    Type: Application
    Filed: December 17, 2020
    Publication date: March 14, 2024
    Applicant: POSCO
    Inventors: Jin-Keun Oh, Seong-Woo Kim, Sang-Heon Kim, Hyo-Sik Chun
  • MICROCRACK-REDUCED, HOT PRESS-FORMED ARTICLE, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20240082902
    Abstract: Disclosed are a hot press-formed article and a method for manufacturing the same. The article is manufactured by hot press forming a galvanized steel sheet comprising a base steel plate and a zinc-based coat layer formed on a surface of the base steel plate, wherein the zinc-based coat layer contains at least one element selected from the group consisting of Sb, Sn, and Bi in a total amount of 0.05% to 2.0% by weight, and a balanced amount of Zn and inevitable impurities, at least 70% by weight of the at least one element selected from the group consisting of Sb, Sn, Bi being concentrated in a region 3 ?m or less distant from the surface of an alloyed zinc-based coat layer, formed by alloying the zinc-based coat layer, of the hot press-formed article.
    Type: Application
    Filed: October 30, 2023
    Publication date: March 14, 2024
    Applicant: POSCO CO., LTD
    Inventors: Hyeon-Seok Hwang, Il-Ryoung Sohn, Jong-Sang Kim
  • GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR
    Publication number: 20240079166
    Abstract: A grain-oriented electrical steel sheet according to an embodiment of the present invention comprises, by wt %, 2.0-4.0% of Si, 0.04-0.2% of Mn, 0.010% or less of N (excluding 0%), 0.005% or less of C (excluding 0%), 0.03-0.08% of Sn and 0.01-0.2% of Cr, the balance of Fe and inevitable impurities, and inclusions comprising at least one from among AlN, (Al,Si)N, (Al,Si,Mn)N, MnS, CuS and Al2O3, wherein the average diameter of the inclusions is 0.5-6.0 ?m, and 40-130/mm2 inclusions having a diameter of 6.0 ?m or less from among the inclusions can be included.
    Type: Application
    Filed: December 17, 2021
    Publication date: March 7, 2024
    Applicant: POSCO Co., Ltd.
    Inventors: Daehyun SONG, Sangwoo LEE