Patents by Inventor Il-Ryoung Sohn

Il-Ryoung Sohn 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).

  • Patent number: 10907243
    Abstract: A plated steel material includes a plated layer containing, by wt %: 0.5 to 14% of Al, 0.5 to 5% of Mg, and the balance being Zn and inevitable impurities. The plated steel material satisfies the following Equation: ([Mg]S?[Mg]1/2)/[Mg]1/2?0.3. [Mg]S means a content (wt %) of Mg in a surface of the plated layer, and [Mg]1/2 means a content (wt %) of Mg at a ½t position (t represents a thickness of the plated layer) from the surface of the plated layer in a thickness direction.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: February 2, 2021
    Assignee: POSCO
    Inventors: Min-Suk Oh, Jong-Sang Kim, Il-Ryoung Sohn, Tae-Chul Kim
  • Publication number: 20210010123
    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: Application
    Filed: December 13, 2018
    Publication date: January 14, 2021
    Inventors: Il-Ryoung SOHN, Tae-Chul KIM, Jung-Kuk KIM, Kyung-Jin AN, Jung-Hoon KIM, Jong-Un JUNG, Jin-Seo PARK
  • Publication number: 20210002751
    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 particularly, to a zinc alloy plated steel material having excellent corrosion resistance after being processed and a method for manufacturing the same.
    Type: Application
    Filed: December 13, 2018
    Publication date: January 7, 2021
    Inventors: Il-Ryoung SOHN, Tae-Chul KIM, Jong-Sang KIM
  • Publication number: 20200377989
    Abstract: Provided is an alloy-plated steel material that can be used in home appliances, automobiles, and construction materials and the like and, more particularly, to an alloy-plated steel material having excellent corrosion resistance and high surface quality.
    Type: Application
    Filed: December 22, 2017
    Publication date: December 3, 2020
    Inventors: Il-Ryoung SOHN, Jong-Sang KIM, Tae-Chul KIM, Jung-Kuk KIM
  • Patent number: 10808292
    Abstract: Provided is a method of manufacturing an HPF part comprising: preparing a steel sheet comprising C: 0.18% to 0.25%, Si: 0.1% to 1.0%, Mn: 0.9% to 1.5%, P: 0.03% or less, S: 0.01% or less, Al: 0.01% to 0.05%, Cr: 0.05% to 0.5%, Ti: 0.01% to 0.05%, B: 0.001% to 0.005%, N: 0.009% or less, and a balance of Fe and impurities; heating the steel sheet at 550° C. to 850° C. followed by maintaining at 640° C. to 680° C., and immersing the steel sheet in a hot dip aluminum plating bath, and a balance of Al and impurities; cooling the plated steel sheet at 15° C./s or faster; heating the cooled hot dip aluminum plated steel sheet at 880° C. to 930° C. followed by maintaining for a certain time; and hot forming the alloyed hot dip aluminum plated steel sheet and quenching at a range of 300° C. or lower at the same time.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: October 20, 2020
    Assignee: POSCO
    Inventors: Il-Ryoung Sohn, Dae-Chul Bae, Heung-Yun Kim
  • Publication number: 20200157672
    Abstract: Zn alloy plated steel material having excellent weldability and processed-part corrosion resistance and a method for production of Zn alloy plated steel material are provided. In the Zn alloy plated steel material comprising base steel material and a Zn alloy plating layer, the Zn alloy plating layer includes, by wt %, Al: 0.1-5.0%, Mg: 0.1-5.0%, as well as a remainder of Zn and inevitable impurities. The Zn alloy plated steel material includes a lower interface layer and an upper interface layer between the base steel material and the Zn alloy plating layer, wherein the lower interface layer is formed on the base steel material and has a dense structure, and the upper interface layer is formed on the lower interface layer and has a network-type or island-type structure.
    Type: Application
    Filed: January 27, 2020
    Publication date: May 21, 2020
    Inventors: Min-Suk OH, Sang-Heon KIM, Tae-Chul KIM, Jong-Sang KIM, Hyun-Chu YUN, Bong-Hwan YOO, Il-Ryoung SOHN
  • Patent number: 10640840
    Abstract: An HPF molding member having a melted aluminum plating layer formed on the surface of a base steel sheet and excellent delamination resistance. The base steel sheet comprises: 0.18-0.25% by weight of C; 0.1-1.0% by weight of Si; 0.9-1.5% by weight of Mn; 0.03% by weight or less of P; 0.01% by weight or less of S; 0.01-0.05% by weight of Al; 0.05-0.5% by weight of Cr; 0.01-0.05% by weight of Ti; 0.001-0.005% by weight of B; 0.009% by weight or less of N; and the balance Fe and other impurities. The plating layer consists of a soft diffusion layer and a hard alloy layer, the hard alloy layer having a tau layer irregularly and non-continuously dispersed and distributed on the inside thereof at 10% or more of the entire area fraction. The difference in hardness between the alloy layer and the diffusion layer is 400 (Hv) or less.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: May 5, 2020
    Assignee: POSCO
    Inventors: Heung-Yun Kim, Il-Ryoung Sohn, Dae-Chul Bae
  • 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
  • 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: 10584407
    Abstract: Zn alloy plated steel material having excellent weldability and processed-part corrosion resistance and a method for production of Zn alloy plated steel material are provided. In the Zn alloy plated steel material comprising base steel material and a Zn alloy plating layer, the Zn alloy plating layer includes, by wt %, Al: 0.1-5.0%, Mg: 0.1-5.0%, as well as a remainder of Zn and inevitable impurities. The Zn alloy plated steel material includes a lower interface layer and an upper interface layer between the base steel material and the Zn alloy plating layer, wherein the lower interface layer is formed on the base steel material and has a dense structure, and the upper interface layer is formed on the lower interface layer and has a network-type or island-type structure.
    Type: Grant
    Filed: December 24, 2015
    Date of Patent: March 10, 2020
    Assignee: POSCO
    Inventors: Min-Suk Oh, Sang-Heon Kim, Tae-Chul Kim, Jong-Sang Kim, Hyun-Chu Yun, Bong-Hwan Yoo, Il-Ryoung Sohn
  • Patent number: 10550457
    Abstract: Zn alloy plated steel material having excellent weldability and processed-part corrosion resistance and a method for production of Zn alloy plated steel material are provided. In the Zn alloy plated steel material comprising base steel material and a Zn alloy plating layer, the Zn alloy plating layer includes, by wt %, Al: 0.1-5.0%, Mg: 0.1-5.0%, as well as a remainder of Zn and inevitable impurities. The Zn alloy plated steel material includes a lower interface layer and an upper interface layer between the base steel material and the Zn alloy plating layer, wherein the lower interface layer is formed on the base steel material and has a dense structure, and the upper interface layer is formed on the lower interface layer and has a network-type or island-type structure.
    Type: Grant
    Filed: December 24, 2015
    Date of Patent: February 4, 2020
    Assignee: POSCO
    Inventors: Min-Suk Oh, Sang-Heon Kim, Tae-Chul Kim, Jong-Sang Kim, Hyun-Chu Yun, Bong-Hwan Yoo, Il-Ryoung Sohn
  • Publication number: 20200017947
    Abstract: Provided is a Zn—Al—Mg-based alloy-plated steel material that can be used in automobiles and home appliances and the like and, more particularly, to a Zn—Al—Mg-based alloy-plated steel material that can suppress the generation of cracks in a plating layer that are generated during processing.
    Type: Application
    Filed: December 21, 2017
    Publication date: January 16, 2020
    Inventors: Il-Ryoung SOHN, Tae-Chul KIM, Jong-Sang KIM
  • Publication number: 20190010595
    Abstract: A plated steel material includes a plated layer containing, by wt %: 0.5 to 14% of Al, 0.5 to 5% of Mg, and the balance being Zn and inevitable impurities. The plated steel material satisfies the following Equation: ([Mg]S?[Mg]1/2)/[Mg]1/2?0.3. [Mg]S means a content (wt %) of Mg in a surface of the plated layer, and [Mg]1/2 means a content (wt %) of Mg at a ½t position (t represents a thickness of the plated layer) from the surface of the plated layer in a thickness direction.
    Type: Application
    Filed: December 16, 2016
    Publication date: January 10, 2019
    Inventors: Min-Suk OH, Jong-Sang KIM, Il-Ryoung SOHN, Tae-Chul KIM
  • Publication number: 20190003031
    Abstract: Provided are a hot press-formed article and a method for manufacturing the same. The article is manufactured by hot press forming a galvanized steel sheet comprising a base steel plate and a zinc-based coat layer formed on a surface of the base steel plate, wherein the zinc-based coat layer contains at least one element selected from the group consisting of Sb, Sn, and Bi in a total amount of 0.05% to 2.0% by weight, and a balanced amount of Zn and inevitable impurities, at least 70% by weight of the at least one element selected from the group consisting of Sb, Sn, Bi being concentrated in a region 3 ?m or less distant from the surface of an alloyed zinc-based coat layer, formed by alloying the zinc-based coat layer, of the hot press-formed article.
    Type: Application
    Filed: December 21, 2016
    Publication date: January 3, 2019
    Inventors: Hyeon-Seok HWANG, Il-Ryoung SOHN, Jong-Sang 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
  • Publication number: 20180371596
    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: Application
    Filed: December 21, 2016
    Publication date: December 27, 2018
    Inventors: Il-Ryoung SOHN, Dae-Young KANG, Jong-Sang KIM, Tae-Chul KIM, Min-Suk OH
  • Publication number: 20180363117
    Abstract: Provided is a hot press formed product, which is prepared by means of hot press forming of a Zn—Al—Mg-based plated steel material comprising base iron and a Zn—Al—Mg-based plated layer, and a method for preparing the same, the hot press formed product comprising an oxide layer formed on the surface thereof, wherein the content ratio of Al to Mg (Al/Mg) in the oxide layer is 0.8 or more.
    Type: Application
    Filed: December 20, 2016
    Publication date: December 20, 2018
    Inventors: Il-Ryoung SOHN, Hyeon-Seok HWANG, Jong-Sang KIM
  • Publication number: 20180223387
    Abstract: Provided is a method of manufacturing an HPF part comprising: preparing a steel sheet comprising C: 0.18% to 0.25%, Si: 0.1% to 1.0%, Mn: 0.9% to 1.5%, P: 0.03% or less, S: 0.01% or less, Al: 0.01% to 0.05%, Cr: 0.05% to 0.5%, Ti: 0.01% to 0.05%, B: 0.001% to 0.005%, N: 0.009% or less, and a balance of Fe and impurities; heating the steel sheet at 550° C. to 850° C. followed by maintaining at 640° C. to 680° C., and immersing the steel sheet in a hot dip aluminum plating bath, and a balance of Al and impurities; cooling the plated steel sheet at 15° C./s or faster; heating the cooled hot dip aluminum plated steel sheet at 880° C. to 930° C. followed by maintaining for a certain time; and hot forming the alloyed hot dip aluminum plated steel sheet and quenching at a range of 300° C. or lower at the same time.
    Type: Application
    Filed: April 3, 2018
    Publication date: August 9, 2018
    Inventors: Il-Ryoung SOHN, Dae-Chul BAE, Heung-Yun 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: 9963758
    Abstract: Provided is a hot press-formed (HPF) member with excellent powdering resistance at the time of press forming. The HPF member includes a hot-dip coating layer containing Al on a surface of a base steel sheet. The base steel sheet includes, based on wt %, 0.18-0.25% of C, 0.1-1.0% 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 the other impurities. The hot-dip coating layer comprises a soft diffusion layer and a hard alloy layer. The alloy layer has a Tau phase in the range of 10-30%, in terms of area percent.
    Type: Grant
    Filed: August 29, 2016
    Date of Patent: May 8, 2018
    Assignee: POSCO
    Inventors: Il-Ryoung Sohn, Dae-Chul Bae, Heung-Yun Kim