Patents by Inventor Kwang Geun Chin

Kwang Geun Chin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200262181
    Abstract: Provided are an austenite-based molten aluminum-plated steel sheet comprising: a steel plate which contains, by weight %, 0.3 to 0.9% of C, 12 to 25% of Mn, 0.5 to 2.5% of Si, 0.3 to 3.0% of Al, 0.01 to 0.5% of Ti, 0.05 to 0.5% of V, 0.01-0.5% of Mo, 0.01-0.2% of Sn, 0.001-0.1% of Co, and 0.001-0.1% of W, the remainder being Fe and unavoidable impurities; and a molten aluminum-based plated layer formed on a surface of the steel plate, and a method for producing the same.
    Type: Application
    Filed: December 22, 2016
    Publication date: August 20, 2020
    Inventors: Young-Ha KIM, Hyeon-Seok HWANG, Kwang-Geun CHIN, Heung-Yun KIM
  • Patent number: 10563280
    Abstract: The present invention relates to a high-strength and high-manganese steel sheet suitable for an outer panel or a vehicle body of a transport vehicle and, more specifically, to a high-strength and high-manganese steel sheet having excellent vibration-proof properties and a method for producing the same.
    Type: Grant
    Filed: December 24, 2013
    Date of Patent: February 18, 2020
    Assignee: POSCO
    Inventors: Sung-Kyu Kim, Kwang-Geun Chin, Tae-Jin Song, Tai-Ho Kim, Won-Tae Cho, Sun-Ho Jeon
  • Patent number: 10508326
    Abstract: There is provided a high-manganese steel with superior coating adhesion and a method of producing a hot-dip galvanized steel sheet from same. According to an aspect of the present disclosure, a high-manganese steel is characterized by including, by weight, C: 0.3-1%, Mn: 8-25%, Al: 1-8%, Si: 0.1-3.0%, Ti: 0.01-0.2%, Sn: 0.06-0.2%, B: 0.0005-0.01%, with the remainder being Fe and inevitable impurities. The present disclosure can provide a high-manganese and hot-dip galvanized steel sheet with superior surface quality as well as with high strength and workability by preventing coating failures that may be caused by manganese.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: December 17, 2019
    Assignee: POSCO
    Inventors: Kwang-Geun Chin, Sun-Ho Jeon
  • Publication number: 20180371586
    Abstract: Provided is a high Mn steel sheet and a manufacturing method therefor, the steel sheet comprising, by wt %: 0-0.1% or less of C; 8-30% of Mn; 0.1% or less of P; 0.02% or less of S; 0.10 or less of N; 0-1.00 of Ti; and Fe and inevitable impurities, wherein a microstructure has epsilon martensite and austenite, and the average particle diameter of the martensite and the austenite is 2 ?m or less.
    Type: Application
    Filed: December 21, 2016
    Publication date: December 27, 2018
    Inventors: Won-Tae CHO, Tai-Ho KIM, Kwang-Geun CHIN, Young-Ha KIM, Tae-Jin SONG
  • Patent number: 10144986
    Abstract: The present invention relates to an ultrahigh-strength steel sheet and a manufacturing method therefor. More specifically, the present invention can provide an ultra-high strength steel sheet which can ensure weldability and a delayed fracture resistance property by controlling the contents of elements affecting platability along with the contents of austenite-stabilizing elements and increasing twin formation through re-rolling, and simultaneously improve impact characteristics and workability by ensuring excellent yield strength and ductility.
    Type: Grant
    Filed: August 14, 2013
    Date of Patent: December 4, 2018
    Assignee: POSCO
    Inventors: Sung-Kyu Kim, Won-Tae Cho, Tai-Ho Kim, Kwang-Geun Chin, Sang-Ho Han
  • Patent number: 10087511
    Abstract: There are provided a method for manufacturing a high manganese hot-dip galvanized steel sheet having superior coatability and ultra-high strength, and a high manganese hot-dip galvanized steel sheet manufactured by the method. The method includes: cold rolling a hot-rolled steel sheet to form a cold-rolled steel sheet, the hot-rolled steel sheet including, by wt %, C: 0.3% to 1%, Mn: 8% to 25%, Si: 0.1% to 3%, Al: 0.01% to 8%, Cr: 0.1% to 2%, Ti: 0.01% to 0.2%, B: 0.0005% to 0.01%, Ni: 0.01% to 2%, Sn: 0.06% to 0.2%, and a balance of Fe and inevitable impurities; heating the cold-rolled steel sheet; cooling the heated steel sheet to, or maintaining the heated steel sheet; and performing a hot-dip galvanizing process on the cooled or temperature-maintained steel sheet by dipping the cooled or temperature-maintained steel sheet into a hot-dip galvanizing bath.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: October 2, 2018
    Assignee: POSCO
    Inventors: Sun-Ho Jeon, Kwang-Geun Chin, Won-Tae Cho
  • Patent number: 10053749
    Abstract: Provided is a method for producing plated steel sheet by means of an annealing device which includes at least one section and in which the at least one section is filled with a gas constituting a non-reducing atmosphere or a weakly reducing atmosphere to substantially improve the quality of plating onto hot-dipped steel sheet, including the plating properties, alloying properties, anti-pickup properties, plating adhesion properties, anti-flaking properties, anti-cratering properties and anti-ash properties, by using prior-art annealing equipment and heat-treatment cycle without any additional oxidation-reduction heat treatment process or large quantities of high-cost alloying elements.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: August 21, 2018
    Assignee: POSCO
    Inventors: Rho-Bum Park, Kwang-Geun Chin, Man-Young Park
  • Patent number: 9856542
    Abstract: Provided is a ferritic lightweight high-strength steel sheet having excellent stiffness and ductility and a method of manufacturing the same. The steel sheet including 0.02 wt % to 0.1 wt % of carbon (C), 4 wt % to 15 wt % of manganese (Mn), 4 wt % to 10 wt % of aluminum (Al), 2.0 wt % or less (excluding 0) of silicon (Si), 0.01 wt % to 0.3 wt % of titanium (Ti), 0.005 wt % to 0.2 wt % of antimony (Sb), and iron (Fe) as well as unavoidable impurities as a remainder, and having a value of 0.25×Ti/C ranging from 0.17 to 1.0 and a value of Mn/Al×Log(C×Ti×10000) ranging from 1.0 to 10.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: January 2, 2018
    Assignee: POSCO
    Inventors: Jai-Hyun Kwak, Kyoo-Young Lee, Kwang-Geun Chin
  • Patent number: 9738958
    Abstract: Provided is an austenitic, lightweight, high-strength steel sheet having a high yield ratio and ductility and a method for producing the same, and more particularly, to a high-strength steel sheet for automotive interior panels, exterior panels, and structural parts, and a method for producing the steel sheet. The steel sheet may be a hot-rolled steel sheet, a cold-rolled steel sheet, or a plated steel sheet. The steel sheet includes, by weight %, C: 0.6% to 1.0%, Si: 0.1% to 2.5%, Mn: 10% to 15%, P: 0.02% or less, S: 0.015% or less, Al: 5% to 8%, Ti: 0.01% to 0.20%, N: 0.02% or less, and the balance of Fe and inevitable impurities, wherein the steel sheet has a specific gravity of 7.4 g/cm3 and a Mn/Al ratio of 2 to 3.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: August 22, 2017
    Assignee: POSCO
    Inventors: Kwang-Geun Chin, Sang-Ho Han, Jai-Hyun Kwak
  • Patent number: 9708703
    Abstract: A high-manganese hot-rolled galvanized steel sheet having no surface defects and improved galvanizing and alloying characteristics is manufactured by using a high-manganese hot-rolled steel sheet. Provided are the high-manganese hot-rolled galvanized steel sheet and a method of manufacturing the high-manganese hot-rolled galvanized steel sheet. The high-manganese hot-rolled galvanized steel sheet includes: a hot-rolled steel sheet including 5 wt % to 35 wt % manganese; and a zinc coating layer formed on the hot-rolled steel sheet, wherein an internal oxide layer is formed in an internal region of the hot-rolled steel sheet facing the zinc coating layer.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: July 18, 2017
    Assignee: POSCO
    Inventors: Sun-Ho Jeon, Kwang-Geun Chin
  • Patent number: 9598753
    Abstract: A high strength thin steel sheet that is mainly used for structural members and inner and outer panels for a vehicle, a galvanized steel sheet, and methods of manufacturing the same. The high strength thin steel sheet for superior press formability includes, by weight percent, 0.06 to 0.4% C, 1.0 to 5.0% Mn, 0.05 to 2.5% Si, 0.01 to 2.0% Ni, 0.02 to 2% Cu, 0.01 to 0.04% Ti, 0.05 to 2.5% Al, 0.005 to 0.1% Sb, 0.0005 to 0.004% B, 0.007% or less N, and balance Fe and inevitable impurities, and meeting relation of Ni+0.5×Mn+0.3×Cu>0.9, which is defined as Ni*, and Al/Ni*<1.3 at a same time, and relation of Ti?0.028×Al. This thin steel sheet is galvanized or galvannealed.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: March 21, 2017
    Assignee: POSCO
    Inventors: Jai Hyun Kwak, Kwang Geun Chin
  • Patent number: 9580786
    Abstract: A high-manganese hot-dip coated steel sheet is disclosed which provides high corrosion resistance, high ductility and high strength, mainly used for inner and outer panels of automobiles, and a method of manufacturing the same. The high-manganese hot-dip coated steel sheet includes a substrate steel sheet having a composition of (in weight %) 0.1 to 1.5% of C, 5 to 35% of Mn, and the remainder includes Fe and other unavoidable impurities, and a hot-dip zinc coating layer formed on the substrate steel sheet, the hot-dip zinc coating layer having a composition of (in weight %) 0.1 to 10% of Mn, 5 to 15% of Fe, and the remainder including Zn and other unavoidable impurities.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: February 28, 2017
    Assignee: POSCO
    Inventors: Il-Ryoung Sohn, Kwang-Geun Chin, Seong-Ju Kim, Myung-Soo Kim, Sung-Kyu Kim
  • Publication number: 20160319415
    Abstract: A hot-dip galvanized steel sheet having excellent resistance to cracking caused by liquid metal embrittlement is provided. The hot-dip galvanized steel sheet having excellent resistance to cracking caused by liquid metal embrittlement includes a base steel sheet having a microstructure in which an austenite fraction is 90 area % or more; and a hot-dip galvanizing layer formed on the base steel sheet, wherein the hot-dip galvanizing layer includes an Fe—Zn alloy layer; and a Zn layer formed on the Fe—Zn alloy layer, and the Fe—Zn alloy layer has a thickness of [(3.4×t)/6] ?m or more, where t is a thickness of the hot-dip galvanizing layer. In addition, provided is the hot-dip galvanized steel sheet in which plating layer delamination easily occurring in vehicle welding and molding conditions according to the related art, is prevented, and cracking caused by liquid metal embrittlement is suppressed.
    Type: Application
    Filed: December 24, 2014
    Publication date: November 3, 2016
    Applicant: POSCO
    Inventors: Ju-Youn LEE, Kwang-Geun CHIN, Sun-Ho JEON, Jong-Sang KIM, Myung-Soo KIM
  • Publication number: 20160244857
    Abstract: The present invention relates to a high-strength and high-manganese steel sheet suitable for an outer panel or a vehicle body of a transport vehicle and, more specifically, to a high-strength and high-manganese steel sheet having excellent vibration-proof properties and a method for producing the same.
    Type: Application
    Filed: December 24, 2013
    Publication date: August 25, 2016
    Inventors: Sung-Kyu KIM, Kwang-Geun CHIN, Tae-Jin SONG, Tai-Ho KIM, Won-Tae CHO, Sun-Ho JEON
  • Publication number: 20160186285
    Abstract: The present invention relates to an ultrahigh-strength steel sheet and a manufacturing method therefor. More specifically, the present invention can provide an ultra-high strength steel sheet which can ensure weldability and a delayed fracture resistance property by controlling the contents of elements affecting platability along with the contents of austenite-stabilizing elements and increasing twin formation through re-rolling, and simultaneously improve impact characteristics and workability by ensuring excellent yield strength and ductility.
    Type: Application
    Filed: August 14, 2013
    Publication date: June 30, 2016
    Applicant: POSCO
    Inventors: Sung-Kyu KIM, Won-Tae CHO, Tai-Ho KIM, Kwang-Geun CHIN, Sang-Ho HAN
  • Publication number: 20160102381
    Abstract: Provided is a method for producing plated steel sheet by means of an annealing device which includes at least one section and in which the at least one section is filled with a gas constituting a non-reducing atmosphere or a weakly reducing atmosphere to substantially improve the quality of plating onto hot-dipped steel sheet, including the plating properties, alloying properties, anti-pickup properties, plating adhesion properties, anti-flaking properties, anti-cratering properties and anti-ash properties, by using prior-art annealing equipment and heat-treatment cycle without any additional oxidation-reduction heat treatment process or large quantities of high-cost alloying elements.
    Type: Application
    Filed: December 16, 2015
    Publication date: April 14, 2016
    Inventors: Rho-Bum Park, Kwang-Geun Chin, Man-Young Park
  • Publication number: 20160040275
    Abstract: A high strength thin steel sheet that is mainly used for structural members and inner and outer panels for a vehicle, a galvanized steel sheet, and methods of manufacturing the same. The high strength thin steel sheet for superior press formability includes, by weight percent, 0.06 to 0.4% C, 1.0 to 5.0% Mn, 0.05 to 2.5% Si, 0.01 to 2.0% Ni, 0.02 to 2% Cu, 0.01 to 0.04% Ti, 0.05 to 2.5% Al, 0.005 to 0.1% Sb, 0.0005 to 0.004% B, 0.007% or less N, and balance Fe and inevitable impurities, and meeting relation of Ni+0.5×Mn+0.3×Cu>0.9, which is defined as Ni*, and Al/Ni*<1.3 at a same time, and relation of Ti?0.028×Al. This thin steel sheet is galvanized or galvannealed.
    Type: Application
    Filed: October 22, 2015
    Publication date: February 11, 2016
    Inventors: Jai Hyun Kwak, Kwang Geun Chin
  • Patent number: 9194030
    Abstract: A high strength thin steel sheet that is mainly used for structural members and inner and outer panels for a vehicle, a galvanized steel sheet, and methods of manufacturing the same. The high strength thin steel sheet for superior press formability includes, by weight percent, 0.06 to 0.4% C, 1.0 to 5.0% Mn, 0.05 to 2.5% Si, 0.01 to 2.0% Ni, 0.02 to 2% Cu, 0.01 to 0.04% Ti, 0.05 to 2.5% Al, 0.005 to 0.1% Sb, 0.0005 to 0.004% B, 0.007% or less N, and balance Fe and inevitable impurities, and meeting relation of Ni+0.5×Mn+0.3×Cu>0.9, which is defined as Ni*, and Al/Ni*<1.3 at a same time, and relation of Ti?0.028×Al. This thin steel sheet is galvanized or galvannealed.
    Type: Grant
    Filed: September 1, 2008
    Date of Patent: November 24, 2015
    Assignee: POSCO
    Inventors: Jai Hyun Kwak, Kwang Geun Chin
  • Publication number: 20150329951
    Abstract: There are provided a method for manufacturing a high manganese hot-dip galvanized steel sheet having superior coatability and ultra-high strength, and a high manganese hot-dip galvanized steel sheet manufactured by the method. The method includes: cold rolling a hot-rolled steel sheet to form a cold-rolled steel sheet, the hot-rolled steel sheet including, by wt %, C: 0.3% to 1%, Mn: 8% to 25%, Si: 0.1% to 3%, Al: 0.01% to 8%, Cr: 0.1% to 2%, Ti: 0.01% to 0.2%, B: 0.0005% to 0.01%, Ni: 0.01% to 2%, Sn: 0.06% to 0.2%, and a balance of Fe and inevitable impurities; heating the cold-rolled steel sheet; cooling the heated steel sheet to, or maintaining the heated steel sheet; and performing a hot-dip galvanizing process on the cooled or temperature-maintained steel sheet by dipping the cooled or temperature-maintained steel sheet into a hot-dip galvanizing bath.
    Type: Application
    Filed: December 19, 2013
    Publication date: November 19, 2015
    Applicant: POSCO
    Inventors: Sun-Ho JEON, Kwang-Geun CHIN, Won-Tae CHO
  • Publication number: 20150266519
    Abstract: A high-ductility, high-strength and high Mn steel strip used for steel strips of automobiles requiring superior formability and high strength, a plated steel strip produced by using the same, and a manufacturing method thereof are disclosed. The high Mn steel strip comprises, by weight %, 0.2˜1.5% of C, 10˜25% of Mn, 0.01˜3.0% of Al, 0.005˜2.0% of Si, 0.03% or less of P, 0.03% or less of S, 0.040% or less of N, and the balance of Fe and other unavoidable impurities. The high-ductility, high-strength and high Mn steel strip, and the plated steel strip produced by using the same have superior surface properties and plating characteristics.
    Type: Application
    Filed: March 2, 2015
    Publication date: September 24, 2015
    Inventors: Seong Ju Kim, Kwang Geun Chin, Hyung Gyu Hwang, Sung Kyu Kim, Il Ryoung Sohn, Young Kook Lee, Oh Yeon Lee