Patents by Inventor Jin Keun Oh

Jin Keun Oh 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: 20210116999
    Abstract: A hand-wearable device includes an elastic sheet including a first elastic layer and a second elastic layer facing each other; a sensor unit formed by printing a predetermined conductive liquid metal between the first elastic layer and the second elastic layer; a wire unit extending from the sensor unit and electrically connected to the sensor unit; an electrode substrate formed on one side of the wire unit and spaced apart from the wire unit by a predetermined distance; and a connection electrode formed by printing a predetermined conductive liquid metal between the wire unit and the electrode substrate.
    Type: Application
    Filed: December 24, 2020
    Publication date: April 22, 2021
    Inventors: Joon Bum BAE, Su In KIM, Woo Keun PARK, Da Hee JEONG, Jin Hyeok OH
  • Patent number: 10934601
    Abstract: Provided is a plated steel sheet for hot press forming, having an excellent impact property, including: a base steel sheet comprising, by wt %, 0.15-0.4% of C, 0.05-1.0% of Si, 0.6-3.0% of Mn, 0.001-0.05% of P, 0.0001-0.02% of S, 0.01-0.1% of Al, 0.001-0.02% of N, 0.001-0.01% of B, 0.01-0.5% of Cr, 0.01-0.05% of Ti, and the balance of Fe and inevitable impurities; and an Al—Si plated layer formed on the surface of the base steel sheet. A thickness of a carbon-depleted layer in a surface layer part of the base steel sheet is 5 ?m or less. The surface layer part means a region from the surface of the base steel sheet to a depth of 200 ?m, and the carbon-depleted layer means a region which the carbon content is 50% or less of an average carbon amount (C0) of the base steel sheet.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: March 2, 2021
    Assignee: POSCO
    Inventors: Seong-Woo Kim, Jin-Keun Oh, Yeol-Rae Cho
  • Publication number: 20200385833
    Abstract: Provided is a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4?0.4*Cr+Si?3.2 (wherein element symbols denote measurements of respective element contents by weight %).
    Type: Application
    Filed: September 26, 2017
    Publication date: December 10, 2020
    Inventors: Jin-Keun OH, Yeol-Rae CHO, A-Ra CHO, Jin-Ho CHA, Si-Myoung HEO, Jeong-Won SEO, Seong-Woo KIM
  • Publication number: 20200190620
    Abstract: Provided is a steel sheet for a hot press formed member having excellent coating adhesion, and a method for manufacturing the same. A steel sheet for hot press forming is an aluminum alloy plated steel sheet, wherein an average Fe content in a plating layer may be 40 wt % or more, and a concentration gradient of a section having a Fe content of 45 wt % to 80 wt % in the plating layer may 7 wt %/?m or less of a concentration gradient at a section having an Fe content of 45% to 80% in the plating layer in a thickness direction from a surface of the plating layer according to a result of GDS analysis.
    Type: Application
    Filed: May 31, 2018
    Publication date: June 18, 2020
    Inventors: Seong-Woo KIM, Jin-Keun OH, A-Ra CHO, Hyeon-Jeong SHIN
  • Publication number: 20200109464
    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: Application
    Filed: May 31, 2018
    Publication date: April 9, 2020
    Applicant: POSCO
    Inventors: Seong-Woo KIM, Jin-Keun OH, Yeol-Rae CHO
  • Publication number: 20200101695
    Abstract: Provided is a steel sheet for a hot press formed member having excellent painting adhesion and post-painting corrosion resistance, and a method for manufacturing the same. A steel sheet for hot press forming according to one aspect of the present invention comprises a base steel sheet and a plated layer formed on a surface of the base steel sheet, wherein the ratio of an area occupied by pores to the entire area of a surface layer portion may be 10% or more in a cross section of the surface layer portion observed when the plated layer is cut in a thickness direction thereof.
    Type: Application
    Filed: May 31, 2018
    Publication date: April 2, 2020
    Inventors: Jin-Keun OH, Seong-Woo KIM, Hyeon-Jeong SHIN, A-Ra CHO
  • Publication number: 20200086608
    Abstract: Provided is an aluminum-based plated steel that is provided for vehicles by hot forming, an aluminum-based alloy plated steel manufactured using the same, and method of manufacturing thereof.
    Type: Application
    Filed: December 21, 2017
    Publication date: March 19, 2020
    Inventors: Jin-Keun OH, Il-Ryoung SOHN, Seong-Woo KIM, Jeom-Soo SHIN
  • Publication number: 20200087747
    Abstract: Provided is a plated steel sheet for hot press forming, having an excellent impact property, including: a base steel sheet comprising, by wt %, 0.15-0.4% of C, 0.05-1.0% of Si, 0.6-3.0% of Mn, 0.001-0.05% of P, 0.0001-0.02% of S, 0.01-0.1% of Al, 0.001-0.02% of N, 0.001-0.01% of B, 0.01-0.5% of Cr, 0.01-0.05% of Ti, and the balance of Fe and inevitable impurities; and an Al—Si plated layer formed on the surface of the base steel sheet. A thickness of a carbon-depleted layer in a surface layer part of the base steel sheet is 5 ?m or less. The surface layer part means a region from the surface of the base steel sheet to a depth of 200 ?m, and the carbon-depleted layer means a region which the carbon content is 50% or less of an average carbon amount (C0) of the base steel sheet.
    Type: Application
    Filed: December 15, 2017
    Publication date: March 19, 2020
    Inventors: Seong-Woo KIM, Jin-Keun OH, Yeol-Rae CHO
  • Patent number: 10590522
    Abstract: An Al—Fe alloy coated steel sheet includes a base steel sheet and an alloy coating layer, wherein the base steel sheet includes, by wt %, C: 0.1%˜0.5%, Si: 0.01%˜2%, Mn: 0.01%˜10%, P: 0.001%˜0.05%, S: 0.0001%˜0.02%, Al: 0.001%˜1.0%, N: 0.001%˜0.02%, and the balance of Fe and other impurities, wherein the alloy coating layer includes: an Al—Fe alloy layer I formed on the base steel sheet and having a Vickers hardness of 200˜800 Hv; an Al—Fe alloy layer III formed on the Al—Fe alloy layer I and having a Vickers hardness of 700˜1200 Hv; and an Al—Fe alloy layer II formed in the Al—Fe alloy layer III continuously or discontinuously in a length direction of the steel sheet, and having a Vickers hardness of 400˜900 Hv, wherein an average oxygen content at a depth of 0.1 ?m from a surface of the oxide layer is 20% or less by weight.
    Type: Grant
    Filed: December 23, 2016
    Date of Patent: March 17, 2020
    Assignee: POSCO
    Inventors: Jin-Keun Oh, Yeol-Rae Cho, Il-Ryoung Sohn, Yong-Soo Kim
  • Patent number: 10533237
    Abstract: Provided is a method for manufacturing an HPF part having excellent bending properties including: manufacturing a hot rolled steel sheet; coiling the hot rolled steel sheet within a range of 450° C. to 750° C. for a time satisfying Expression 1; cold rolling, annealing and then hot dip aluminum plating on the annealed steel sheet; heating the hot dip aluminum plated steel sheet to a temperature of 850° C. to 1000° C. and maintaining the hot dip aluminum plated steel sheet for a certain period of time; and hot forming the heated steel and cooling at a temperature within a range of 200° C. or lower at a cooling speed of 20° C./s to 1000° C./s at the same time to manufacture an HPF part, [Expression 1] 190,000?[coiling temperature (CT)×Time (min)]/2?350,000, in the Relational Expression 1, Time refers to a time taken to reach 200° C. from coiling temperature.
    Type: Grant
    Filed: November 1, 2018
    Date of Patent: January 14, 2020
    Assignee: POSCO
    Inventors: Jin-Keun Oh, Yeol-Rae Cho, Seong-Woo Kim
  • Publication number: 20200010915
    Abstract: Provided is a hot press-formed member having excellent crack propagation resistance and ductility. The hot press-formed member includes: a base steel sheet and a zinc or zinc alloy plating layer on at least one surface of the base steel sheet. The base steel sheet contains, by wt %, carbon (C): 0.08-0.30%, silicon (Si): 0.01-2.0%, manganese (Mn): 3.1-8.0%, aluminum (Al): 0.001-0.5%, phosphorus (P): 0.001-0.05%, sulfur (S): 0.0001-0.02%, nitrogen (N): 0.02% or less, and a balance of iron (Fe) and other impurities. The hot press-formed member comprises 1-30 area % of retained austenite as a microstructure, and a Mn(wt %)/Zn(wt %) content ratio in an oxide layer of 0.5-1.2 ?m in a thickness direction from a surface layer of the plating layer is 0.1 or more.
    Type: Application
    Filed: July 7, 2017
    Publication date: January 9, 2020
    Inventors: Jin-Keun OH, Seong-Woo KIM, Yeol-Rae CHO, Won-Mo BAK
  • Patent number: 10253388
    Abstract: The present invention provides: a steel sheet capable of manufacturing a formed product having superior bendability and ultra-high strength when compared with conventional steel sheets for manufacturing a hot press formed product; the formed product having superior bendability and ultra-high strength by using the same; and a method for manufacturing the same.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: April 9, 2019
    Assignee: POSCO
    Inventors: Yeol-Rae Cho, Jae-Hoon Lee, Jin-Keun Oh, Sim-Kun Min, Chang-Sig Choi
  • Publication number: 20190062865
    Abstract: Provided is a method for manufacturing an HPF part having excellent bending properties including: manufacturing a hot rolled steel sheet; coiling the hot rolled steel sheet within a range of 450° C. to 750° C. for a time satisfying Expression 1; cold rolling, annealing and then hot dip aluminum plating on the annealed steel sheet; heating the hot dip aluminum plated steel sheet to a temperature of 850° C. to 1000° C. and maintaining the hot dip aluminum plated steel sheet for a certain period of time; and hot forming the heated steel and cooling at a temperature within a range of 200° C. or lower at a cooling speed of 20° C./s to 1000° C./s at the same time to manufacture an HPF part, [Expression 1] 190,000?[coiling temperature (CT)×Time (min)]/2?350,000, in the Relational Expression 1, Time refers to a time taken to reach 200° C. from coiling temperature.
    Type: Application
    Filed: November 1, 2018
    Publication date: February 28, 2019
    Inventors: Jin-Keun OH, Yeol-Rae CHO, Seong-Woo KIM
  • Publication number: 20190003029
    Abstract: An Al—Fe alloy coated steel sheet includes a base steel sheet and an alloy coating layer, wherein the base steel sheet includes, by wt %, C: 0.1%˜0.5%, Si: 0.01%˜2%, Mn: 0.01%˜10%, P: 0.001%˜0.05%, S: 0.0001%˜0.02%, Al: 0.001%˜1.0%, N: 0.001%˜0.02%, and the balance of Fe and other impurities, wherein the alloy coating layer includes: an Al—Fe alloy layer I formed on the base steel sheet and having a Vickers hardness of 200˜800 Hv; an Al—Fe alloy layer III formed on the Al—Fe alloy layer I and having a Vickers hardness of 700˜1200 Hv; and an Al—Fe alloy layer II formed in the Al—Fe alloy layer III continuously or discontinuously in a length direction of the steel sheet, and having a Vickers hardness of 400˜900 Hv, wherein an average oxygen content at a depth of 0.1 ?m from a surface of the oxide layer is 20% or less by weight.
    Type: Application
    Filed: December 23, 2016
    Publication date: January 3, 2019
    Inventors: Jin-Keun OH, Yeol-Rae CHO, Il-Ryoung SOHN, Yong-Soo KIM
  • Patent number: 10151013
    Abstract: Provided is an HPF member having excellent bending characteristics and a hot-dip aluminum plated layer formed on a surface of a base steel sheet. The base steel sheet includes, in terms of wt %, 0.18-0.25% of C, 0.1-0.5% of Si, 0.9-1.5% of Mn, 0.03% or less of P, 0.01% or less of S, 0.01-0.05% of Al, 0.05-0.5% of Cr, 0.01-0.05% of Ti, 0.001-0.005% of B, 0.009% or less of N, the balance Fe and other impurities; a ferrite phase having a thickness within 50 ?m is continuously or discontinuously formed inside a surface portion of the base steel sheet; the fraction of the surface portion occupied by the ferrite phase is 5% or less; and carbide materials having a size of 1 ?m or less are scattered and distributed in the surface portion of the base steel sheet so as to occupy 90% or more of the overall carbide distribution.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: December 11, 2018
    Assignee: POSCO
    Inventors: Jin-Keun Oh, Yeol-Rae Cho, Seong-Woo Kim
  • Publication number: 20180195159
    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: Application
    Filed: March 7, 2018
    Publication date: July 12, 2018
    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
  • Patent number: 9945020
    Abstract: Provided is a zinc-plated steel sheet for hot pressing having outstanding surface characteristics, comprising: a steel foundation plate comprising a metal surface diffusion layer of which the Gibbs free energy reduction per mole of oxygen during oxidation is less than that of Cr, an aluminum-rich layer containing at least 30 wt. % of aluminum formed on the surface diffusion layer, and a zinc plating layer formed on the aluminum-rich layer. In this way, a metal having a low affinity for oxygen is coated to an effective thickness prior to annealing and thus the creation of annealing oxides at the surface of the steel sheet is suppressed and a uniform zinc plating layer is formed, and alloying of the zinc plating layer is promoted during press-processing heat treatment. Cracking in the steel foundation plate during hot press molding is prevented.
    Type: Grant
    Filed: May 4, 2015
    Date of Patent: April 17, 2018
    Assignee: POSCO
    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
  • Publication number: 20180023171
    Abstract: Provided is a warm-pressed member comprising, by weight %, C: 0.01% to 0.5%, Si: 3.0% or less (excluding 0%), Mn: 3% to 15%, P: 0.0001% to 0.1%, S: 0.0001% to 0.03%, Al: 3.0% or less (excluding 0%), N: 0.03% or less (excluding 0%), and the balance of Fe and inevitable impurities. After a warm press forming process and a cooling process, the warm-pressed member has a microstructure comprising: 5 volume % to 50 volume % of retained austenite; and at least one of ferrite, martensite, tempered martensite, and bainite as a remainder.
    Type: Application
    Filed: September 29, 2017
    Publication date: January 25, 2018
    Inventors: Jin-Keun OH, Kyoo-Young LEE, Yeol-Rae CHO, Eul-Yong CHOI, Ki-Soo KIM
  • Publication number: 20160362763
    Abstract: Provided is an HPF member having excellent bending characteristics and a hot-dip aluminum plated layer formed on a surface of a base steel sheet. The base steel sheet includes, in terms of wt %, 0.18-0.25% of C, 0.1-0.5% of Si, 0.9-1.5% of Mn, 0.03% or less of P, 0.01% or less of S, 0.01-0.05% of Al, 0.05-0.5% of Cr, 0.01-0.05% of Ti, 0.001-0.005% of B, 0.009% or less of N, the balance Fe and other impurities; a ferrite phase having a thickness within 50 ?m is continuously or discontinuously formed inside a surface portion of the base steel sheet; the fraction of the surface portion occupied by the ferrite phase is 5% or less; and carbide materials having a size of 1 ?m or less are scattered and distributed in the surface portion of the base steel sheet so as to occupy 90% or more of the overall carbide distribution.
    Type: Application
    Filed: August 29, 2016
    Publication date: December 15, 2016
    Inventors: Jin-Keun OH, Yeol-Rae CHO, Seong-Woo KIM
  • Publication number: 20160312331
    Abstract: The present invention provides: a steel sheet capable of manufacturing a formed product having superior bendability and ultra-high strength when compared with conventional steel sheets for manufacturing a hot press formed product; the formed product having superior bendability and ultra-high strength by using the same; and a method for manufacturing the same.
    Type: Application
    Filed: December 22, 2014
    Publication date: October 27, 2016
    Inventors: Yeol-Rae CHO, Jae-Hoon LEE, Jin-Keun OH, Sim-Kun MIN, Chang-Sig CHOI