Patents Assigned to Posco
  • Steel sheet for hot press formed member having excellent resistance to hydrogen delayed fracture and method for manufacturing thereof
    Patent number: 11338549
    Abstract: Provided is a steel sheet for a hot press formed member having excellent resistance to hydrogen delayed fracture, and a method for manufacturing the same. A steel sheet for a hot press formed member comprises: a base steel sheet; an aluminum alloy plating layer on a surface of the base steel sheet; and an oxide layer which is formed on a surface of the plating layer and has a thickness of 0.05 ?m or more.
    Type: Grant
    Filed: May 31, 2018
    Date of Patent: May 24, 2022
    Assignee: POSCO
    Inventors: Seong-Woo Kim, Jin-Keun Oh, Yeol-Rae Cho
  • Ferritic stainless steel having excellent high-temperature oxidation resistance, and manufacturing method therefor
    Patent number: 11339460
    Abstract: Disclosed are a ferritic stainless steel capable of inhibiting high temperature oxidation through generation of an effective oxide scale, and manufacturing method thereof. The ferritic stainless steel excellent in oxidation resistance at high temperature according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, Cr: 10 to 30%, Si: 0.2 to 1.0%, Mn: 0.1 to 2.0%, W: 0.3 to 2.5%, Ti: 0.001 to 0.15%, Al: 0.001 to 0.1%, the remainder of iron (Fe) and other inevitable impurities, and satisfies a following equation (1).
    Type: Grant
    Filed: September 6, 2018
    Date of Patent: May 24, 2022
    Assignee: POSCO
    Inventors: Il Chan Jung, Jin-Suk Kim, Han-Hyuk Go, Ji Eon Park
  • Hot-dip galvanized steel sheet having excellent low-temperature adhesion and workability
    Patent number: 11338551
    Abstract: Provided is a hot-dip galvanized steel sheet having excellent low-temperature adhesion and workability, and a manufacturing method therefor, the hot-dip galvanized steel sheet comprising: an inhibition layer formed on a base steel sheet and comprising an Fe—Al-based intermetallic alloy phase; a hot-dip galvanized layer formed on the inhibition layer; and an Al—Mn-based alloy phase discontinuously formed between the inhibition layer and the hot-dip galvanized layer.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: May 24, 2022
    Assignee: POSCO
    Inventors: Hyeon-Seok Hwang, Sang-Heon Kim
  • Gold-colored steel sheet and manufacturing method thereof
    Patent number: 11339459
    Abstract: The present invention discloses a gold-colored steel sheet capable of expressing color without peeling of a modified layer and the gold-colored steel sheet capable of forming a color-modified layer through a conventional annealing process without expensive facilities. A method of manufacturing the gold-colored steel sheet according to an embodiment of the present invention can form a TiN modified layer on a surface of a steel sheet comprising 0.3 to 1.5 wt % of titanium (Ti) by an annealing treatment in a nitrogen (N2) atmosphere at 900 to 1,200° C. for 30 to 300 seconds.
    Type: Grant
    Filed: May 15, 2017
    Date of Patent: May 24, 2022
    Assignee: POSCO
    Inventors: Jung-Hyun Kong, Sang Seok Kim, Mi Nam Park
  • Zinc alloy plated steel material having excellent surface quality and corrosion resistance
    Patent number: 11332816
    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 specifically, to a zinc alloy plated steel material having excellent surface quality and corrosion resistance, and a method for manufacturing the same.
    Type: Grant
    Filed: December 13, 2018
    Date of Patent: May 17, 2022
    Assignee: POSCO
    Inventors: Il-Ryoung Sohn, Tae-Chul Kim, Jung-Kuk Kim, Kyung-Jin An, Jung-Hoon Kim, Jong-Un Jung, Jin-Seo Park
  • Composition for washing pickled steel plate, method for washing pickled steel plate by using same, and steel plate obtained thereby
    Patent number: 11332667
    Abstract: A composition for washing a pickled steel plate and a method for washing a pickled steel plate using the same are provided. The composition for washing a pickled steel plate includes a phosphoric acid ester compound, an amine-based compound, sodium carbonate, ammonium acetate, ethylene diamine tetraacetic acid (EDTA) and a remainder of water, and the method for washing a pickled steel plate is performed using the same.
    Type: Grant
    Filed: May 11, 2021
    Date of Patent: May 17, 2022
    Assignee: POSCO
    Inventors: Rho-Bum Park, Yon-Kyun Song, Ji-Hoon Park, Hoon Yun, Seok-Chan Choe, Kyoung-Pil Ko
  • Insulation film composition for grain-oriented electrical steel sheet, method for forming insulation film for grain-oriented electrical steel sheet using same, and grain-oriented electrical steel sheet
    Patent number: 11335475
    Abstract: An insulation film composition for a grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 10-50 parts by weight of metal silicate or organic silicate, 20-70 parts by weight of inorganic nanoparticles and 0.1-20 parts by weight of cobalt hydroxide. The insulation film composition can further include 10-50 parts by weight of metal phosphate, and/or 5-30 parts by weight of inorganic nanoparticles having a particle diameter of 1 nm to less than 10 nm, and/or inorganic nanoparticles having a particle diameter of 10 to 100 nm and/or 0.1-20 parts by weight of chromium oxide.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: May 17, 2022
    Assignee: POSCO
    Inventors: Min Serk Kwon, Hyun Seok Ko
  • High-hardness wear-resistant steel and method for manufacturing same
    Patent number: 11332802
    Abstract: One aspect of the present invention aims to provide high-hardness wear-resistant steel having excellent wear resistance to a thickness of 40t (mm) as well as high strength and impact toughness, and a method for manufacturing same.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: May 17, 2022
    Assignee: POSCO
    Inventors: Seng-Ho Yu, Mun-Young Jung, Young-Jin Jung
  • Grain-oriented electrical steel sheet and manufacturing method therefor
    Patent number: 11326221
    Abstract: According to an exemplary embodiment of the present invention, a manufacturing method of a grain-oriented electrical steel sheet, includes: preparing a slab; heating the slab; forming a hot-rolled sheet by hot-rolling the slab; performing hot-rolled sheet annealing on the hot-rolled sheet; forming a cold-rolled sheet by cold-rolling the hot-rolled sheet that has been completely subjected to the hot-rolled sheet annealing; performing first recrystallization annealing on the cold-rolled sheet; and performing second recrystallization annealing on the cold-rolled sheet that has been completely subjected to the first recrystallization annealing, wherein the hot-rolled sheet undergoes a first heating step, a second heating step, and a soaking step, and a temperature rise rate t1 of the first heating step and a temperature rise rate t2 of the second heating step satisfy Formula 1.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: May 10, 2022
    Assignee: POSCO
    Inventors: Dae Hyun Song, Seung Il Kim, June Soo Park, Il Nam Yang
  • Non-oriented electrical steel sheet and manufacturing method therefor
    Patent number: 11319619
    Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention comprises Si: 2.0 to 3.5%, Al: 0.3 to 3.5%, Mn: 0.2 to 4.5%, Zn: 0.0005 to 0.02% in wt % and Fe and inevitable impurities as a balance amount.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: May 3, 2022
    Assignee: POSCO
    Inventors: Jae-Hoon Kim, Jong Uk Ryu, Hun Ju Lee, Yoon Sung Kim
  • Grain-oriented electrical steel sheet and magnetic domain refinement method therefor
    Patent number: 11318562
    Abstract: A grain-oriented electrical steel sheet includes a groove formed on a surface and a solidified alloy layer formed under the groove, wherein the solidified alloy layer includes particles of a certain average diameter.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: May 3, 2022
    Assignee: POSCO
    Inventors: Oh-Yeoul Kwon, Se-Min Park, Jong-Tae Park, Won-Gul Lee
  • Method for refining magnetic domains of grain-oriented electrical steel sheet
    Patent number: 11313011
    Abstract: A method for refining magnetic domains of a grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes: a step of preparing a grain-oriented electrical steel sheet; and a step of forming a groove by irradiating a quasi-continuous laser beam of which a duty is from 98.0 to 99.9% on a surface of the grain-oriented electrical steel sheet.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: April 26, 2022
    Assignee: POSCO
    Inventors: Oh-Yeoul Kwon, Ki-Young Min, Se-Min Park, Jong-Tae Park, Seong-Cheol Hong
  • ANNEALING SEPARATING AGENT COMPOSITION FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET, GRAIN-ORIENTED ELECTRICAL STEEL SHEET, AND METHOD FOR MANUFACTURING GRAIN ORIENTED ELECTRICAL STEEL SHEET
    Publication number: 20220119910
    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: Application
    Filed: December 14, 2021
    Publication date: April 21, 2022
    Applicant: POSCO
    Inventors: Min Serk Kwon, Tae Young No, Chang Soo Park, Heon-Jo Choi
  • High-strength hot-dip zinc plated steel material having excellent plating properties and method for preparing same
    Patent number: 11306381
    Abstract: Provided are a hot-dip zinc plated steel material and a method for preparing same, the hot-dip zinc plated steel material comprising: base iron comprising 0.01-1.6 wt % of Si and 1.2-3.1 wt % of Mn; a Zn—Al—Mg alloy plating layer; and an Al-rich layer formed on the interface of the base iron and Zn—Al—Mg alloy plating layer, wherein the rate of occupied surface area of the Al-rich layer is 70% or higher (including 100%).
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: April 19, 2022
    Assignee: POSCO
    Inventors: Il-Ryoung Sohn, Dae-Young Kang, Jong-Sang Kim, Tae-Chul Kim, Min-Suk Oh
  • Steel sheet having excellent resistance to liquid metal embrittlement cracks and method for manufacturing the same
    Patent number: 11299793
    Abstract: Provided is a steel sheet having excellent resistance to liquid metal embrittlement cracks and a method for manufacturing the same. The steel sheet includes, by weight %, 0.04% to 0.35% of C, 0.99% or less of Al+Si, 3.5% to 10% of Mn, 0.05% or less of P (excluding 0%), 0.02% or less of S (excluding 0%), and 0.02% or less of N (excluding 0%) with a remainder of Fe and other inevitable impurities, wherein the steel sheet comprises a microstructure comprising at least 10% of residual austenite, at least 60% of annealed martensite and 20% or less of alpha martensite and epsilon martensite, by volume fraction, and an average thickness of a Mn-depleted layer is at least 0.5 ?m from a product surface.
    Type: Grant
    Filed: June 22, 2018
    Date of Patent: April 12, 2022
    Assignee: POSCO
    Inventors: Sea-Woong Lee, Kyoo-Young Lee, Joo-Hyun Ryu, Ki-Cheol Kang
  • Austenitic stainless steel product having excellent surface properties and manufacturing method of the same
    Patent number: 11299799
    Abstract: An austenitic stainless steel product having excellent surface characteristics and a manufacturing method therefor are disclosed. The disclosed austenitic stainless steel product comprises an austenitic stainless steel comprising, by weight percent, 0.005 to 0.15% of C, 0.1 to 1.0% of Si, 0.1 to 2.0% of Mn, 6.0 to 8.0% of Ni, 16 to 18% of Cr, 0.1 to 4.0% of Cu, 0.005 to 0.2% of N, 0.01 to 0.2% of Mo, and the remainder comprising iron (Fe) and other unavoidable impurities, and a Ni surface negative segregation thereof defined by the following formula (1) is 0.6 to 0.9 and the martensite fraction thereof is 10 to 30%. (CNi-Min)/(CNi-Ave)??formula (1) Here, CNi-min is the minimum concentration of Ni on the surface and CNi-Ave is the average concentration of Ni on the surface.
    Type: Grant
    Filed: December 4, 2017
    Date of Patent: April 12, 2022
    Assignee: POSCO
    Inventors: Hyung Gu Kang, Jae-Hong Shim, Gyu Jin Jo, Dong Chul Chae
  • Non-oriented electrical steel sheet and manufacturing method therefor
    Patent number: 11299792
    Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes Ti at 0.0030 wt % or less (excluding 0 wt %), Nb at 0.0035 wt % or less (excluding 0 wt %), V at 0.0040 wt % or less (excluding 0 wt %), B at 0.0003 wt % to 0.0020 wt %, and the remaining portion including Fe and other inevitably added impurities, wherein a value of ([Ti]+0.8[Nb]+0.5[V])/(10*[B]) may be 0.17 to 7.8.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: April 12, 2022
    Assignee: POSCO
    Inventors: Jae-Hoon Kim, Jong Uk Ryu, Seung Il Kim, Sin Young Jung, Su Yong Sin, Sang Woo Lee
  • Zinc-based plated steel material having excellent sealer adhesion
    Patent number: 11299639
    Abstract: Provided are a zinc-base plated steel material comprising a base steel and a zinc-based plated layer and a post-treatment film, which are sequentially formed on the base steel. The post-treatment film comprises an oxide or oxide salt of at least one group A element selected from B, Al, V, and Fe and an organic compound, wherein the content of oxygen atoms in the post-treatment film is 50 atom % or more, and wherein when the mole number of oxygen atoms forming a covalent bond with hydrogen in the post-treatment film is a and the mole number of oxygen atoms not forming the covalent bond with hydrogen is b, a/b is 0.3 or greater; and a composition for forming the post-treatment film.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: April 12, 2022
    Assignee: POSCO
    Inventors: Yeon-Ho Kim, Yong-Woon Kim, Yung-Keun Kim, Yon-Kyun Song
  • Non-oriented electrical steel sheet and manufacturing method therefor
    Patent number: 11299791
    Abstract: A non-oriented electric steel sheet includes 2.5 wt % to 3.1 wt % of Si, 0.1 wt % to 1.3 wt % of Al, 0.2 wt % to 1.5 wt % of Mn, 0.008 wt % or less of C (excluding 0 wt %), 0.005 wt % or less of S (excluding 0 wt %), 0.005 wt % or less of N (excluding 0 wt %), 0.005 wt % or less of Ti (excluding 0 wt %), 0.001 wt % to 0.07 wt % of Mo, 0.001 wt % to 0.07 wt % of P, 0.001 wt % to 0.07 wt % of Sn, and 0.001 wt % to 0.07 wt % of Sb, in which a remainder includes Fe and inevitable impurities, an average crystal grain diameter is 70 ?m to 150 ?m, the non-oriented electric steel sheet satisfies Equations (1) and (2), 0.32?([Al]+[Mn])/[Si]?0.5??[Equation 1] 0.025?[Mo]+[P]+[Sn]+[Sb]?0.15??[Equation 2] (here, a bracket denotes the contents (wt %) of each element).
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: April 12, 2022
    Assignee: POSCO
    Inventors: Hun Ju Lee, Yong Soo Kim, Su Yong Sin
  • ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREOF
    Publication number: 20220106657
    Abstract: A method for manufacturing an oriented electrical steel sheet according to an exemplary embodiment of the present invention includes: providing a slab including, as wt %, Si at equal to or less than 4.0% (excluding 0%), C at 0.001% to 0.4%, and Mn at 0.001% to 2.0%, and including a balance including Fe and inevitably mixed and input impurities; reheating the slab; manufacturing a hot steel sheet by hot-rolling the slab; performing hot-rolled steel sheet annealing to the hot steel sheet; primarily cold-rolling the hot-rolled steel sheet annealed hot steel sheet; decarburization-annealing the cold-rolled steel sheet; secondarily cold-rolling the decarburization-annealed steel sheet; and finally annealing the cold-rolled steel sheet, wherein, regarding the finally annealed steel sheet, a size 2L of a magnetic domain existing in a grain is less than a thickness D of the steel sheet (2L<D).
    Type: Application
    Filed: December 17, 2021
    Publication date: April 7, 2022
    Applicant: POSCO
    Inventors: Kyu-Seok HAN, Hyun-Seok KO