Patents Assigned to Posco
  • COLD-ROLLED STEEL SHEET FOR STRUCTURAL SECTION HAVING EXCELLENT HARDNESS AND PROCESSABILITY, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230020991
    Abstract: A cold-rolled sheet according to an example of the present invention comprises at most 0.004 wt % (exclusive of 0 wt %) of C, at most 0.02 wt % (exclusive of 0 wt %) of Si, 0.1 to 0.3 wt % of Mn, at most 0.05 wt % (exclusive of 0 wt %) of Al, at most 0.02 wt % (exclusive of 0 wt %) of P, at most 0.001 wt % (exclusive of 0 wt %) of S, at most 0.004 wt % (exclusive of 0 wt %) of N, 0.015 to 0.035 wt % of Ti, and 0.001 to 0.003 wt % of B, with the balance being Fe and other inevitable impurities, and has a microstructure in which the crystal grain aspect ratio defined by the following equation 1 is 1.4 to 4.0.
    Type: Application
    Filed: December 9, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Minho Jo, Young-Kwang Hong
  • Black plated steel sheet and manufacturing method thereof
    Patent number: 11555240
    Abstract: A black plated steel sheet includes a steel sheet and an Al—Mg—Si-based plating layer disposed on one surface or both surfaces of the steel sheet; in which the plating layer includes a black layer on the outermost surface thereof, and the black layer has a weight ratio of O to (Al+Mg+Si+O) of 0.01 to 0.6.
    Type: Grant
    Filed: December 21, 2020
    Date of Patent: January 17, 2023
    Assignees: POSCO HOLDINGS INC., RESEARCH INSTITUTE OF INDUSTRIAL SCIENCE & TECHNOLOGY
    Inventors: Kyung Hwang Lee, Jae In Jeong, Hye Jeong Kim, Ji Hoon Yang
  • Method for producing lithium hydroxide from lithium phosphate
    Patent number: 11554965
    Abstract: The present invention relates to a method of manufacturing lithium hydroxide, which includes adding at least one acid selected from hydrochloric acid, sulfuric acid, and nitric acid into lithium phosphate slurry including a lithium phosphate particle, adding an alkali material to the lithium phosphate slurry including the acid, and converting it into a lithium hydroxide aqueous solution.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: January 17, 2023
    Assignee: POSCO CO., LTD
    Inventors: Kyunghoon Kim, Sang Min Lee, Jong-Hak Lee, Ki Young Kim, Jae Hyug Choi, Souhwan Son
  • ULTRASONIC TESTING APPARATUS WITH VARIABLE FREQUENCY
    Publication number: 20230009623
    Abstract: The present invention relates to an ultrasonic testing apparatus with a variable frequency, which can automatically change the frequency according to thickness and thereby detect internal defects in objects having various thicknesses. The ultrasonic testing apparatus may comprise: a nozzle jetting a medium toward an object so as to form a medium column; and a plurality of probes disposed in the nozzle so as to generate ultrasonic waves.
    Type: Application
    Filed: December 16, 2020
    Publication date: January 12, 2023
    Applicant: POSCO
    Inventors: Choong-Soo Lim, Hyeong-Jun Huh, Sang-Jin Lee
  • PRE-STRESSED STEEL SHEET AND METHOD OF MANUFACTURING SAME
    Publication number: 20230008459
    Abstract: The present invention relates to a pre-stressed steel sheet and a method a method of manufacturing the same. An embodiment of the present invention provides a pre-stressed steel sheet comprising: a base material; and a plurality of weld lines formed on the base materials, wherein the average spacing between each pair of the weld lines is equal to or greater than five times the width of the weld lines and equal to or less than half the width of the steel sheet. According to an aspect of the present invention, a pre-stressed steel sheet having improved bendability can be provided, and accordingly when the pre-stressed steel sheet is applied to a structural member such as a girder or beam, the bendability of a structure can be improved.
    Type: Application
    Filed: December 10, 2020
    Publication date: January 12, 2023
    Applicant: POSCO
    Inventor: Jae-Yik Lee
  • Steel sheet plated with Al—Fe alloy for hot press forming having excellent corrosion resistance and heat resistance, hot press formed part, and manufacturing method therefor
    Patent number: 11549167
    Abstract: A steel plate plated with an aluminum-iron alloy for hot press forming can include a base steel sheet and an alloy plated layer formed on the base steel sheet. The alloy plated layer can include an alloyed layer (I) formed on the base steel sheet and containing, by weight, Al: 5-30%; an alloyed layer (II) formed on the alloyed layer (I) and containing, by weight, Al: 30-60%; and an alloyed layer (III) formed on the alloyed layer (II) and containing, by weight, Al: 20-50%. The alloy layer (II) can have a FeAl (Si) alloy phase dispersed and distributed therein, in which the FeAl (Si) alloy phase includes, by weight, Al: 20-50% and Si: 5-20%, and the number density of the FeAl (Si) alloy phase having a circle-equivalent diameter of 5 ?m or less 15 is 103/mm2 or more.
    Type: Grant
    Filed: November 29, 2019
    Date of Patent: January 10, 2023
    Assignee: POSCO
    Inventors: Seong-Woo Kim, Jin-Keun Oh, Sang-Heon Kim, Yeol-Rae Cho
  • Alloy steel manufacturing method
    Patent number: 11549162
    Abstract: Provided is an alloy steel manufacturing method, the method including: preparing a manganese-containing first molten ferroalloy; preparing a chromium-containing second molten alloy; preparing molten steel; mixing the first molten ferroalloy and the second molten ferroalloy to manufacture third molten ferroalloy; and mix pouring the third molten ferroalloy and the molten steel to manufacture an alloy steel, wherein the phosphorous concentration in the molten steel may efficiently be controlled by reducing the converter end point temperature of the molten steel to improve a phosphorous control capacity during converter refining.
    Type: Grant
    Filed: July 15, 2019
    Date of Patent: January 10, 2023
    Assignee: POSCO CO., LTD
    Inventors: Woong Hee Han, Yeo Sun Yun, Soo Chang Kang, Jung Hwan Son
  • TIN BLACKPLATE FOR PROCESSING AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230002869
    Abstract: The present invention provides a tin blackplate for processing and a method for manufacturing the same. The tin blackplate according to an exemplary embodiment of the present invention comprises: in % by weight, 0.0005 to 0.005% of carbon (C), 0.15 to 0.60% of manganese (Mn), 0.01 to 0.06% of aluminum (AI), 0.0005 to 0.004% of nitrogen (N), 0.0005 to 0.003% of boron (B), 0.01 to 0.035% of titanium (Ti), and the balance being iron (Fe) and inevitable impurities, and satisfies the following Formula 1. 4.8?([Ti]+[Al])/[N]?[B]?12.5??[Equation 1] In this case, in Equation 1, [Ti], [Al], [N], and [B] mean each value obtained by dividing the content (% by weight) of Ti, Al, N, and B in the blackplate by each atomic weight thereof.
    Type: Application
    Filed: December 16, 2020
    Publication date: January 5, 2023
    Applicant: POSCO
    Inventors: Jai-Ik Kim, Jea-Chun Jeon
  • STEEL FOR HOT FORMING, HOT-FORMED MEMBER, AND MANUFACTURING METHODS THEREFOR
    Publication number: 20230002873
    Abstract: An embodiment of the present invention provides steel for hot forming, a hot-formed member, and methods for manufacturing same, the steel comprising, by wt %, 0.06-0.1% of C, 0.05-0.6% of Si, 0.6-2% of Mn, 0.05% or less of P, 0.02% or less of S, 0.01-0.1% of Al, 0.01-0.8% of Cr, 0.01-0.5% of Mo, 0.02% or less of N, and the remainder of Fe and inevitable impurities, wherein an alloy factor represented by relational expression 1 below is 7 or more, and the number of carbides having a circular equivalent diameter of 0.5 ?m or greater is 105/mm2 or less. Alloy factor=I(Mn)×I(Si)×I(Cr)×I(Mo)??[Relational expression 1] where the I values for the components are I(Mn)=3.34×Mn+1, I(Si)=0.7×Si+1, I(Cr)=2.16×Cr+1, and I(Mo)=3×Mo+1, respectively, and the content of each component is expressed as wt %.
    Type: Application
    Filed: December 18, 2020
    Publication date: January 5, 2023
    Applicant: POSCO
    Inventors: Seong-Woo Kim, Jin-Keun Oh, Sang-Heon Kim, Hyo-Sik Chun, Seong-Beom Bae
  • SPIRAL TUBE
    Publication number: 20230001464
    Abstract: The present invention relates to a spiral tube capable of improving resistance performance against a collapse load generated by the difference between an internal pressure and an external pressure, while having a reduced thickness, the spiral tube comprising: a tube body in which a strip is connected in a spiral shape and welded at the front end thereof; and a stiffener provided on the inner surface of the tube body.
    Type: Application
    Filed: January 23, 2020
    Publication date: January 5, 2023
    Applicant: POSCO
    Inventor: Woo-Yeon Cho
  • HIGH HARDNESS WEAR-RESISTANT STEEL HAVING EXCELLENT LOW-TEMPERATURE IMPACT TOUGHNESS, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230002872
    Abstract: The present invention provides wear-resistant steel which has high hardness while having wear resistance and high impact toughness at low temperature, and a manufacturing method therefor.
    Type: Application
    Filed: December 1, 2020
    Publication date: January 5, 2023
    Applicant: POSCO
    Inventors: Jang-Yong Yoo, Seng-Ho Yu, Hyun-Kwan Cho, Moo-Jong Bae
  • ZINC PLATED STEEL SHEET HAVING EXCELLENT FATIGUE STRENGTH OF ELECTRICAL RESISTANCE SPOT WELDS, AND MANUFACTURING METHOD THEREOF
    Publication number: 20230002845
    Abstract: The present disclosure relates to a zinc plated steel sheet having excellent fatigue strength of electrical resistance spot welds and a method for manufacturing the same. According to an aspect of the present disclosure, a zinc plated steel sheet includes a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet, wherein a concentration profile of one or two of oxygen, and silicon and manganese measured in a depth direction from the surface of the base steel sheet has a maximum point in the depth direction from the surface, and an absolute value of a difference between a depth at which the maximum point of the concentration profile of oxygen is formed and a depth at which the maximum point of the concentration profile of one of silicon and manganese is formed is 0.5 ?m or less.
    Type: Application
    Filed: December 3, 2020
    Publication date: January 5, 2023
    Applicant: POSCO
    Inventors: Ki-Cheol Kang, Chung-Hwan Lee
  • GRAPHENE-COATED STEEL SHEET AND METHOD FOR PRODUCING SAME
    Publication number: 20230001445
    Abstract: The present invention pertains to a method for producing a graphene-coated steel sheet, the method comprising the steps of: modifying the surface of the steel sheet so that the surface is negatively charged; forming a positively-charged first graphene oxide layer on the surface-modified steel sheet; forming a negatively-charged second graphene oxide layer on the first graphene oxide layer; and heat-treating the steel sheet on which the first and second graphene oxide layers are formed. The present invention provides a graphene coating method which can be easily applied to large-area coating through a simple process without a special dispersant or binder, and has the effect of allowing the excellent physical properties of graphene to be more efficiently exhibited.
    Type: Application
    Filed: October 20, 2020
    Publication date: January 5, 2023
    Applicant: POSCO
    Inventors: Hye-Jin Yoo, Jung-Su Kim, Je-Hoon Baek, Chang-Se Byeon
  • HIGH-STRENGTH STEEL HAVING SUPERIOR DUCTILITY, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230002871
    Abstract: The present invention is to provide a steel having high strength properties and also having superior elongation, and a manufacturing method therefor.
    Type: Application
    Filed: December 1, 2020
    Publication date: January 5, 2023
    Applicant: POSCO
    Inventors: Sang-Ho Kim, Woo-Gyeom Kim
  • Hot dip plated steel sheet having excellent corrosion resistance and workability
    Patent number: 11541637
    Abstract: Provided is a plated steel sheet applicable for various purposes as in construction materials, household electric appliances, automobiles, etc. and, more particularly, to a hot dip plated steel sheet having excellent corrosion resistance and workability and a manufacturing method therefor.
    Type: Grant
    Filed: December 10, 2018
    Date of Patent: January 3, 2023
    Assignee: POSCO Co., Ltd
    Inventors: Su-Young Kim, Moon-Jae Kwon
  • Austenitic stainless steel having excellent processability and surface characteristics, and manufacturing method therefor
    Patent number: 11542569
    Abstract: An austenitic stainless steel having excellent processability and surface characteristics and a method of manufacturing the austenitic stainless steel are disclosed. The austenitic stainless steel includes, by weight %, 0.005% to 0.15% of carbon (C), 0.1% to 1.0% of silicon (Si), 0.1% to 2.0% of manganese (Mn), 6.0% to 10.5% of nickel (Ni), 16% to 20% of chromium (Cr), 0.005% to 0.2% of nitrogen (N), the remainder iron (Fe) and other unavoidable impurities, wherein a degree of Ni surface negative segregation defined by the following Formula (1) is in a range of 0.6 to 0.9. (CNi-Min)/(CNi-Ave)??Formula (1), where CNi-Min is a minimum concentration of Ni on the surface of the austenitic stainless steel and CNi-Ave is an average concentration of Ni on the surface of the austenitic stainless steel.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: January 3, 2023
    Assignee: POSCO CO., LTD.
    Inventors: Hyung-Gu Kang, Sang Jin Lee, Jae-Hong Shim, Yong-Heon Lee, Jong-Jin Jeon
  • Magnesium alloy sheet and manufacturing method thereof
    Patent number: 11542577
    Abstract: A magnesium alloy sheet according to an embodiment of the present invention includes greater than 3 wt % and less than or equal to 5 wt % of Al, 0.5 wt % to 1.5 wt % of Zn, 0.1 wt % to 0.5 wt % of Mn, 0.001 wt % to 0.01 wt % of B, 0.1 wt % to 0.5 wt % of Y, a balance amount of magnesium, and other inevitable impurities on the basis of a total of 100 wt %.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: January 3, 2023
    Assignee: POSCO HOLDINGS INC.
    Inventors: Jae Sin Park, Taek Geun Lee, Dae Hwan Choi, Bae Mun Seo, Hye Ji Kim, Jonggeol Kim, Hye Jeong Kim, Yoonsuk Oh, Jae Eock Cho, Dong Kyun Choo
  • METHOD FOR MANUFACTURING WELDED STRUCTURE, AND WELDED STRUCTURE MANUFACTURED THEREBY
    Publication number: 20220410303
    Abstract: An aspect of the present disclosure is to provide a method for manufacturing a welded structure capable of effectively suppressing welding LME cracks generated during spot welding of a zinc plated steel sheet having ultra-high strength, and a welded structure manufactured using the same.
    Type: Application
    Filed: November 25, 2020
    Publication date: December 29, 2022
    Applicant: POSCO
    Inventors: Young-Ha Kim, Chang-Sik Choi, Ki-Hyun Park
  • THIN GLASS LAYER-LAMINATED PRINTED STEEL SHEET HAVING EXCELLENT FLAME RETARDANCY AND MANUFACTURING METHOD THEREOF
    Publication number: 20220410537
    Abstract: The present disclosure relates to a thin glass layer-laminated printed steel sheet having a clearly visible pattern printed on a printed steel sheet and has excellent flame retardancy, and a method for manufacturing the same. Specifically, the present disclosure provides a thin glass layer-laminated printed steel sheet comprising: a printed steel sheet comprising a metal sheet and a printed layer on which a design or pattern having a resolution of 300 dpi or higher is printed, the printed layer being formed on a surface of the metal sheet; a transparent ultraviolet-curable adhesive layer comprising a flame retardant material and having a thickness of 10 to 100 ?m, the adhesive layer being formed on the printed steel sheet; and thin glass layer attached by the adhesive layer, and a method for manufacturing the same.
    Type: Application
    Filed: December 10, 2020
    Publication date: December 29, 2022
    Applicant: POSCO
    Inventors: Jung-Hwan Lee, Yang-Ho Choi, Jin-Tae Kim
  • Hot rolled steel plate for electric resistance welded steel pipe having excellent weldability, and manufacturing method thereof
    Patent number: 11535907
    Abstract: Provided is a steel used for chassis parts, etc. of an automobile and, more specifically, to a hot rolled steel plate for an electric resistance welded steel pipe, which shows an excellent weldability in electric resistance welding, and a manufacturing method thereof.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: December 27, 2022
    Assignee: POSCO CO., LTD
    Inventors: Seok-Jong Seo, Hyun-Taek Na