Patents Assigned to Posco
  • HOT-DIP Zn-Al-Mg-BASED ALLOY-PLATED STEEL MATERIAL HAVING EXCELLENT CORROSION RESISTANCE OF PROCESSED PORTION, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230021399
    Abstract: An exemplary embodiment in the present disclosure provides a hot-dip Zn—Al—Mg-based alloy-plated steel material having excellent corrosion resistance in a processed portion, and a method for manufacturing the same. The steel material includes: an iron substrate; and a hot-dip alloy-plated layer formed on the iron substrate, wherein the hot-dip alloy-plated layer contains, by wt %, more than 8% to 25% of Al, more than 4% to 12% of Mg, and a balance of Zn and inevitable impurities, a fraction of a MgZn2 phase in the hot-dip alloy-plated layer is 10 to 45 area %, cracks are formed inside the MgZn2 phase, and the number of cracks present per 100 ?m in a direction perpendicular to a thickness direction of a steel sheet in a field of view in which the cracks are observed based on a cross section in the thickness direction of the steel sheet is 3 to 80.
    Type: Application
    Filed: December 2, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Heung-Yun Kim, Sung-Joo Kim, Yong-Joo Kim, Dae-Young Kang
  • STEEL MATERIAL HAVING EXCELLENT SULFIDE STRESS CORROSION CRACKING RESISTANCE AND METHOD OF MANUFACTURING SAME
    Publication number: 20230026210
    Abstract: The present disclosure relates to a thick steel material that can be appropriately used as a line pipe, a sour-resistant material and, more particularly, to a high-strength steel material having excellent sulfide stress corrosion cracking resistance and excellent resistance against propagation of sulfide stress corrosion cracking, and a method of manufacturing the steel material.
    Type: Application
    Filed: December 15, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Seong-Ung Koh, Moo-Jong Bae, Yoen-Jung Park, Young-Sub Byun, Dae-Woo Baek
  • STEEL SHEET FOR A STRUCTURE WITH EXCELLENT SEAWATER CORROSION RESISTANCE AND METHOD OF MANUFACTURING SAME
    Publication number: 20230026116
    Abstract: The present invention related to a structural steel sheet having excellent seawater resistance and having excellent corrosion resistance in environments in which corrosion is accelerated by seawater, and a method for manufacturing same.
    Type: Application
    Filed: November 27, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventor: Jin-Ho Park
  • STEEL SHEET WITH IMPROVED YELLOWING RESISTANCE AND PHOSPHATABILITY AND MANUFACTURING METHOD THEREOF
    Publication number: 20230024286
    Abstract: The present invention relates to a steel sheet with improved yellowing resistance and phosphatability, wherein the steel sheet contains 0.5% by weight or more of Mn, and contains 0.01 to 10 mg/m2 of Ca+Mg, 0.01 to 10 mg/m2 of P, 0.01 to 20 mg/m2 of C, and 0.05 to 30 mg/m2 of O as components excluding a steel component on the surface of the steel sheet after pickling, water rinsing, and drying. According to the present invention, in a manufacturing process of the steel sheet, the surface of the steel sheet is subjected to a chemical conversion treatment for improving phosphatability and yellowing resistance in a water-cooling section or a water-washing section, thereby having an effect of improving the surface quality of products using same and various subsequently treated products.
    Type: Application
    Filed: October 13, 2020
    Publication date: January 26, 2023
    Applicant: POSCO
    Inventors: Rho-Bum Park, Jong-Ho Kim
  • Hot-rolled steel sheet having excellent expandability and method for manufacturing same
    Patent number: 11560607
    Abstract: The present invention relates to steel used for a sash component and the like of a vehicle and, more specifically, to a hot-rolled steel sheet for a high-strength electric resistance welded steel pipe having excellent expandability and a method for manufacturing same, the hot-rolled steel sheet having a smaller decrease in the strength of a welding heat-affected zone (HAZ) formed during electric resistance welding, in comparison with a base material.
    Type: Grant
    Filed: November 15, 2018
    Date of Patent: January 24, 2023
    Assignee: POSCO Co., Ltd
    Inventors: Hyun-Taek Na, Seok-Jong Seo
  • COMPOSITION FOR SURFACE TREATING OF STEEL SHEET, STEEL SHEET USING SAME, AND MANUFACTURING METHOD OF SAME
    Publication number: 20230019863
    Abstract: The present disclosure provides a solution composition having excellent acid corrosion resistance and adhesion to a steel sheet, a steel sheet surface-treated using the solution composition, and a method for manufacturing the steel sheet. Specifically, the present disclosure provides a solution composition for treating a surface of a steel sheet, the solution composition containing colloidal silica, alkoxy silane, a solvent, an acidity regulator, an acrylate-based monomer, an adhesion improver including a backbone formed of siloxane bonds, and a metal chelate curing agent, a steel sheet surface-treated using the solution composition, and a method for manufacturing the steel sheet.
    Type: Application
    Filed: December 3, 2020
    Publication date: January 19, 2023
    Applicants: POSCO, NOROO COIL COATINGS CO., LTD.
    Inventors: Chang-Hoon Choi, Won-Ho Son, Chan-Seok Bang, Jae-Duck Ko
  • COLD-ROLLED STEEL SHEET FOR FLUX-CORED WIRE AND METHOD FOR PRODUCING SAME
    Publication number: 20230014632
    Abstract: The present embodiments relate to a cold-rolled steel sheet for a flux-cored wire and a method for manufacturing the same. According to an exemplary embodiment, a cold-rolled steel sheet for a flux-cored wire, including: by wt %, 0.0005 to 0.01% of carbon (C), 0.05 to 0.25% of manganese (Mn), 0.03% or less (except for 0%) of silicon (Si), 0.0005 to 0.01% of phosphorus (P), 0.001 to 0.008% of sulfur (S), 0.0001 to 0.010% of aluminum (Al), 0.0005 to 0.003% of nitrogen (N), 0.5 to 1.7% of nickel (Ni), 0.0005 to 0.0030% of boron (B), and the balance Fe and inevitable impurities, can be provided.
    Type: Application
    Filed: December 16, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Jai-Ik KIM, Jea-Chun JEON
  • METAL-PLASTIC COMPOSITE MATERIAL AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230016611
    Abstract: The present invention provides a metal-plastic composite material having excellent adhesive strength and formability and a method for manufacturing the same, and specifically, the present invention provides a metal-plastic composite material and a method for manufacturing the same comprising: a metal layer; and a plastic layer on at least one surface of the metal layer, wherein a thin film layer formed of a silane coupling agent is provided between the metal layer and the plastic layer, and the metal layer and the plastic layer are bonded by covalent bonding with the silane coupling agent.
    Type: Application
    Filed: December 9, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Hye-Jin Yoo, Chang-Se Byeon, Jung-Su Kim, Je-Hoon Baek, Hwi-Geon Kim
  • ALUMINUM ALLOY-PLATED STEEL SHEET HAVING EXCELLENT WORKABILITY AND CORROSION RESISTANCE AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230012544
    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 preventing 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: January 19, 2023
    Applicant: POSCO
    Inventors: Suk-Kyu Lee, Hyeon-Seok Hwang, Myung-Soo Kim
  • ZINC PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND SPOT WELDABILITY, AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230018291
    Abstract: The present invention relates to a zinc plated steel sheet having excellent surface quality and spot weldability, and a manufacturing method therefore. A zinc plated steel sheet according to one aspect of the present invention comprises a base steel sheet and a zinc-based plating layer formed on the surface of the base steel sheet, wherein the GDOES profile of oxygen, which is measured in the depth direction from the surface of the base steel sheet, has a form in which a local minimum point and a local maximum point alternately appear in the depth direction from the surface, and the difference (a local maximum value—a local minimum value) between the oxygen concentration (a local minimum value) at the local minimum point and the oxygen concentration (a local maximum value) at the local maximum point can be 0.1 wt % or more.
    Type: Application
    Filed: December 3, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Ki-Cheol Kang, Sang-Ho Uhm, Chung-Hwan Lee
  • STEEL PLATE SURFACE MATERIAL PROPERTY TESTING DEVICE AND STEEL PLATE SURFACE MATERIAL PROPERTY TESTING METHOD
    Publication number: 20230019171
    Abstract: The steel plate material property testing device determining a material property of a surface of the steel plate by generating the eddy current in the steel plate includes: an eddy current tester disposed so as to face the steel plate; and a frame to which the eddy current tester is fixed, in which the eddy current tester includes: a coil disposed so as to form an alternating-current (AC) magnetic field in only one direction; an AC power supply unit connected to the coil; a sensor unit connected to the coil; and a material property determination unit connected to the sensor unit and determining the material property of the steel plate based on a measured signal obtained through the sensor unit.
    Type: Application
    Filed: December 17, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Ju-Seung LEE, Seong-Ung KOH
  • NON-HEAT TREATED WIRE ROD HAVING EXCELLENT DRAWABILITY AND IMPACT TOUGHNESS AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230020381
    Abstract: Provided are a non-heat treated wire rod having high drawability and impact toughness, and a method for manufacturing the non-heat treated wire rod. The non-heat treated wire rod includes, by wt%, C: 0.02% to 0.30%, Si: 0.05% to 0.8%, Mn: 0.5% to 2.0%, Cr: 1.0% or less, P: 0.03% or less, S: 0.03% or less, sol.Al: 0.01% to 0.07%, N: from greater than 0.01% to 0.02%, Nb: 0.1% or less, V: 0.5% or less, and Ti: 0.1% or less, and a balance of Fe and inevitable impurities, wherein the non-heat treated wire rod has a microstructure including ferrite and pearlite.
    Type: Application
    Filed: December 11, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Dong-Jun Mun, In-Gyu Park, Se-Hong Min
  • HIGH-STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT YIELD RATIO, AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230012991
    Abstract: Disclosed is a follow-up process-omitting type high-strength hot-rolled steel sheet having an excellent yield ratio and a method for manufacturing the same. The hot-rolled steel sheet includes, in percent by weight (wt %), 0.12% or more and less than 0.3% of C, 0.5% or less of Si (excluding 0), 0.1 to 2.5% of Mn, 0.0005 to 0.005% of B, 0.02% or less of P, 0.01% or less of S, and the balance of Fe and inevitable impurities, has a microstructure including at least 95 vol % of martensite, has a yield ratio (yield strength/tensile strength) of 0.75 or more, is manufactured by continuous hot rolling, and is manufactured without performing a follow-up process such as cold rolling and heat treatment.
    Type: Application
    Filed: November 11, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Kyongsu PARK, Deukjung KIM, Hak-jun KIM
  • HIGH-STRENGTH BLACKPLATE AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230017796
    Abstract: The present invention provides a high-strength tin blackplate and a manufacturing method therefor. The tin blackplate according to an exemplary embodiment of the present invention includes: by wt %, 0.03 to 0.09% of carbon (C); 0.2 to 0.4% of manganese (Mn); 0.01 to 0.06% of aluminum (Al); 0.15 to 0.45% of chromium (Cr); 0.05 to 0.25% of copper (Cu); 0.03 to 0.08% of titanium (Ti); and the balance of iron (Fe) and inevitable impurities, and has a yield strength of 570 to 700 MPa.
    Type: Application
    Filed: December 16, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventor: Jai-Ik Kim
  • BEARING WIRE ROD AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230020054
    Abstract: Disclosed is a bearing wire rod includes, in percent by weight (wt %), 0.8 to 1.2% of C, 0.01 to 0.6% of Si, 0.1 to 0.6% of Mn, 1.0 to 2.0% of Cr, 0.01 to 0.06% of Al, 0.02% or less (exclusive of 0) of N, and the balance of Fe and inevitable impurities, wherein a prior austenite grain size of a microstructure is from 3 to 10 ?m, and a sum of lengths of high angle grain boundaries having a misorientation angle of 15° or more per unit area is from 1,000 to 4,000 mm/mm2.
    Type: Application
    Filed: February 6, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Jae Seung LEE, Se Hong MIN, Kyoung-Won KIM, Woo Seok CHOI, Ki-Hwan KIM, In Gyu PARK
  • WIRE ROD AND COMPONENT, FOR COLD FORGING, EACH HAVING EXCELLENT DELAYED FRACTURE RESISTANCE CHARACTERISTICS, AND MANUFACTURING METHODS THEREFOR
    Publication number: 20230020467
    Abstract: Disclosed are a wire rod and a component, for cold forging, each having excellent delayed fracture resistance characteristics and applicable to high-strength bolts and the like and a manufacturing method therefor. According to an embodiment, a heat-treated component having excellent delayed fracture resistance characteristics includes, in percent by weight (wt %), 0.3 to 0.5% of C, 0.01 to 0.3% of Si, 0.3 to 1.0% of Mn, at least two types selected from the group consisting of 0.3 to 1.5% of Cr, 0.3 to 1.5% of Mo, and 0.01 to 0.4% of V, and the balance being Fe and other impurities, includes, as a microstructure, a tempered martensite phase in an area fraction of 95% or more, and includes V-based carbides having a diameter of 300 nm or less at 10/100 ?m2 or more.
    Type: Application
    Filed: November 9, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Byung-in JUNG, Yong-sik PARK
  • NON-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230021013
    Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt %, Si: 1.5% or less, C: 0.01% or less (excluding 0%), Mn: 0.03 to 3%, P: 0.01 to 0.2%, S: 0.001 to 0.02%, Al: 0.01% or less (excluding 0%), N: 0.005% or less (excluding 0%), Cu: 0.02 to 0.3%, 0.0001 to 0.005 wt % of Ca and Mg either alone or in total, 0.001 to 0.2 wt % of Sb and Sn either alone or in total, and a balance of Fe and inevitable impurities.
    Type: Application
    Filed: December 17, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Se Il LEE, Hyunwoo MUN
  • NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME
    Publication number: 20230021153
    Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt %, Si: 1.5 to 4.0%, Al: 0.1 to 1.5%, Mn: 0.05 to 1.5%, Sn: 0.015 to 0.1%, P: 0.005 to 0.05%, Ga: 0.001 to 0.004%, and Bi: 0.0005 to 0.003%, and the balance of Fe and inevitable impurities. An area fraction of texture in a {118}//ND orientation is higher than that of texture in a {111}///ND orientation.
    Type: Application
    Filed: December 9, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Hunju LEE, Jae-Hoon KIM, Seung-Gon LEE, Seung Il KIM
  • ALUMINUM-BASED ALLOY-COATED STEEL SHEET AND METHOD OF MANUFACTURING SAME
    Publication number: 20230019519
    Abstract: The present disclosure relates to an aluminum-based alloy-coated steel sheet and a method of manufacturing the same and, more particularly, to an aluminum-based alloy-coated steel sheet that can be preferably applied to automotive steel sheets, etc., and a method of manufacturing the same. An embodiment of the present disclosure provides an aluminum-based alloy-coated steel sheet that includes: a base steel sheet; an Al-based alloy-coated layer formed on at least one surface of the base steel sheet; and a Zn-Al-based coated layer formed on the Al-based alloy-coated layer, including Al: 0.5˜1.0%, and a balance of Zn and unavoidable impurities in percentage by weight, and having an adhesion amount of 3˜12 g/m2, and a method of manufacturing the aluminum-based alloy-coated steel sheet.
    Type: Application
    Filed: December 1, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Woo-Sung Jung, Sang-Hoon Park, Suk-Kyu Lee
  • HOT-DIPPED GALVANIZED STEEL SHEET HAVING EXCELLENT BENDING WORKABILITY AND CORROSION RESISTANCE AND MANUFACTURING METHOD THEREFOR
    Publication number: 20230019786
    Abstract: A hot-dipped galvanized steel sheet having excellent bending workability and corrosion resistance and a manufacturing method therefor are provided. A hot-dipped galvanized steel sheet of the present invention comprises: a base steel sheet; a Zn—Mg—Al based plating layer provided on at least one surface of the base steel sheet and including, in wt %, with respect to components other than iron (Fe) diffused from the base steel sheet, 5.1 to 25% of Al and 4.0-10% of Mg, and the remainder of Zn and other inevitable impurities; and an interfacial alloy layer having a Fe—Al—Zn composition formed between the base steel sheet and the plating layer, wherein the interfacial alloy layer has a thickness of 0.
    Type: Application
    Filed: December 1, 2020
    Publication date: January 19, 2023
    Applicant: POSCO
    Inventors: Sung-Joo Kim, Heung-Yun Kim, Myung-Soo Kim, Dae-Young Kang, Yong-Joo Kim