Patents by Inventor Hyung-Don Joo
Hyung-Don Joo 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).
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Publication number: 20250051888Abstract: A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, by wt %, 1.4-3.0% of Si; 0.001-1.5% of Mn; and 0.001-0.2% of Al, with the remainder of Fe and inevitable impurities, wherein a thickness deviation in the direction perpendicular to a rolling direction is 1.5 ?m or less per 5 mm length, and a thickness derivation in the rolling direction is 10 ?m or less per 1000 m length.Type: ApplicationFiled: December 20, 2022Publication date: February 13, 2025Applicant: POSCO CO., LTDInventors: Jaewan Hong, Hyung Don Joo, Junesoo Park
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Publication number: 20240242863Abstract: A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention contains, by wt %: 0.005% or less (excluding 0%) of C, 1.5 to 3.0% of Si, 0.4 to 1.5% of Mn, 0.005% or less (excluding 0%) of S, 0.0001 to 0.7% of Al, 0.005% or less (excluding 0%) of N, 0.005% or less (excluding 0%) of Ti, 0.001 to 0.02% of Cu, 0.01 to 0.05% of Sb, 0.001 to 0.1% of Sn, and 0.005 to 0.07% of P, wherein contents of Mn, Si, and Al satisfy the following [Expression 1], contents of Sb, Sn, and P satisfy the following [Expression 2], the non-oriented electrical steel sheet contains a balance of Fe and unavoidably incorporated impurities, and the number of (Mn, Cu)S precipitates of 0.5 ?m or less per area is 1/?m3 or less: 0.19 ? [ Mn ] / ( [ Si ] + 150 × [ Al ] ) ? 0.35 [ Expression ? 1 ] 1 / 2 * ? Sn < [ Sb ] + [ P ] < 0 . 0 ? 9 .Type: ApplicationFiled: December 20, 2022Publication date: July 18, 2024Applicant: POSCO Co., LtdInventors: Hyung Don Joo, Jaewan Hong, Yong-Soo Kim, Junesoo Park, Yunsu Kim
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Patent number: 12040110Abstract: Disclosed are an oriented electrical steel sheet and a manufacturing method thereof. An exemplary embodiment of the present invention provides a method of manufacturing an oriented electrical steel sheet, including: providing a slab including Si at 1.0 to 4.0 wt %, C at 0.1 to 0.4 wt %, and the remaining portion including Fe and other inevitably incorporated impurities; reheating the slab; producing a hot rolled steel sheet by hot rolling the slab; performing annealing of the hot rolled steel sheet; cold rolling the annealed hot rolled steel sheet; decarburizing and primary annealing the cold rolled steel sheet; cold rolling the decarburized and annealed steel sheet; and secondary annealing the cold rolled steel sheet.Type: GrantFiled: May 12, 2021Date of Patent: July 16, 2024Assignee: POSCO CO., LTDInventors: Hyun-Seok Ko, Kyu-Seok Han, Hyung-Ki Park, Jin-Wook Seo, Jae-Soo Lim, Hyung Don Joo
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Patent number: 11725254Abstract: A method for manufacturing grain-oriented electrical steel sheet includes: manufacturing a steel slab having at least one of 2 wt % to 7 wt % of Si, 0.03 wt % to 0.10 wt % of Sn, and 0.01 wt % to 0.05 wt % of Sb; hot-rolling the steel slab to produce a hot-rolled sheet; cold-rolling the hot-rolled sheet to produce a cold-rolled sheet; primary recrystallization-annealing the cold-rolled sheet; applying an annealing separator to the primary recrystallization-annealed cold-rolled sheet and drying the same; and secondary recrystallization-annealing the cold-rolled sheet on which the annealing separator is applied. The primary recrystallization-annealing is performed so that the thickness of an oxide layer formed on the surface of the cold-rolled sheet is 0.5 ?m to 2.5 ?m, and the oxygen amount of the oxide layer is 600 ppm or more after the primary recrystallization-annealing, and in which a forsterite (Mg2SiO4) film can be removed in the secondary recrystallization-annealing.Type: GrantFiled: December 23, 2016Date of Patent: August 15, 2023Assignee: POSCO CO., LTDInventors: Min Soo Han, Hyung Don Joo, Jong Ho Park, Chang Soo Park, Byung Deug Hong
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Patent number: 11667985Abstract: The present invention relates to a composition for forming an insulation coating film of an oriented electrical steel sheet, including a first component (A) including a composite metal phosphate, a derivative thereof, or a mixture thereof, and a second component (B) including at least two colloidal silicas having different average particle diameters, a method for forming an insulation coating film using the same, and an oriented electrical steel sheet having an insulation coating film formed thereon.Type: GrantFiled: December 22, 2015Date of Patent: June 6, 2023Assignee: POSCO Co., LtdInventors: Min Soo Han, Hyung Don Joo, Hyung Ki Park, Jae-Keun Shin, Chang-Soo Kim
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Patent number: 11667984Abstract: A grain-oriented electrical steel sheet according to an embodiment of the present includes Si at 1.0 wt % to 7.0 wt %, C at 0.005 wt % or less (excluding 0 wt %), In at 0.001 wt % to 0.5 wt %, and the remainder including Fe and other impurities unavoidably added thereto.Type: GrantFiled: December 20, 2017Date of Patent: June 6, 2023Assignee: POSCO CO., LTDInventors: Hyung Don Joo, Min Soo Han, Hyung Ki Park, Sang Woo Lee, Jin-Wook Seo
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Patent number: 11608540Abstract: A grain-oriented electrical steel sheet of an embodiment of the present invention comprises Si: 1.0% to 7.0% and Y: 0.005% to 0.5% by wt %, and the remainder comprising Fe and other inevitable impurities, and 10 pieces or less of inclusions comprising Y and having a diameter of 30 nm to 5 ?m per area of 1 mm2.Type: GrantFiled: December 21, 2017Date of Patent: March 21, 2023Assignee: POSCO CO., LTDInventors: Chang Soo Park, Kyu-Seok Han, Hyung Don Joo, Jae Kyoum Kim, Woo-Sin Kim
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Patent number: 11603572Abstract: A method for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises: a step for hot-rolling a slab to produce a hot-rolled sheet; a step for cold-rolling the hot-rolled sheet to produce a cold-rolled sheet; a step for subjecting the cold-rolled sheet to primary recrystallization annealing; and a step for subjecting the primary recrystallization annealing-completed cold-rolled sheet to secondary recrystallization annealing, wherein the primary recrystallization annealing step includes a preceding step and a subsequent step, and the amount (A) of nitriding gas introduced in the preceding step with respect to the total amount (B) of nitriding gas introduced in the primary recrystallization annealing step satisfies expression 1 below. 0.05?[A]/[B]?[t]??[Expression 1] (In expression 1, the amount of nitriding gas introduced is in units of Nm3/hr, and [t] represents the thickness (mm) of a cold-rolled sheet.Type: GrantFiled: September 25, 2019Date of Patent: March 14, 2023Assignee: POSCO CO., LTDInventors: Kyung-Jun Ko, Hyung Don Joo, Sang-Woo Lee
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Publication number: 20230025678Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt%, Si: 2.2 to 4.5 %, Mn: 0.5 % or less (excluding 0 %), AI: 0.001 to 0.5 %, Sn: 0.07 to 0.25 %, and N: 0.0010 to 0.0090 %, and the balance of Fe and inevitable impurities. A surface layer portion existing in an inner direction from a surface of the steel sheet and a central portion existing inside the surface layer portion are included, and the central portion includes N at 0.005 wt% or less, and the surface layer portion further includes N at 0.001 wt% or more compared to the central portion; and the surface layer portion has an average grain size of 60 µm or less, while the central portion has an average grain size of 70 to 300 µm.Type: ApplicationFiled: December 17, 2020Publication date: January 26, 2023Applicant: POSCOInventors: Hyung Don JOO, Il-Nam YANG, Junesoo PARK, Chang Soo PARK
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Publication number: 20220042123Abstract: A method for manufacturing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises: a step for hot-rolling a slab to produce a hot-rolled sheet; a step for cold-rolling the hot-rolled sheet to produce a cold-rolled sheet; a step for subjecting the cold-rolled sheet to primary recrystallization annealing; and a step for subjecting the primary recrystallization annealing-completed cold-rolled sheet to secondary recrystallization annealing, wherein the primary recrystallization annealing step includes a preceding step and a subsequent step, and the amount (A) of nitriding gas introduced in the preceding step with respect to the total amount (B) of nitriding gas introduced in the primary recrystallization annealing step satisfies expression 1 below. 0.05?[A]/[B]?[t]??[Expression 1] (In expression 1, the amount of nitriding gas introduced is in units of Nm3/hr, and [t] represents the thickness (mm) of a cold-rolled sheet.Type: ApplicationFiled: September 25, 2019Publication date: February 10, 2022Inventors: Kyung-Jun KO, Hyung Don JOO, Sang-Woo LEE
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Publication number: 20220010402Abstract: A grain-oriented electrical steel sheet according to an embodiment of the present invention includes: in wt %, Si at 1.0 to 7.0%, Mn at 0.5% or less (excluding 0%), Al at 0.005% or less (excluding 0%), S at 0.0055% or less (excluding 0%), one or more of Ba and Y at 0.005 to 0.5%, one or more of Sn at 0.02 to 0.15%, Sb at 0.01 to 0.08%, and Ni at 0.02 to 0.5%, and the balance of Fe and inevitable impurities.Type: ApplicationFiled: November 28, 2019Publication date: January 13, 2022Inventors: Hyung Don JOO, Kyung-Jun KO, Chang Soo PARK, Jae Kyoum KIM, Sang-Woo LEE, Jin-Wook SEO
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Publication number: 20210265087Abstract: Disclosed are an oriented electrical steel sheet and a manufacturing method thereof. An exemplary embodiment of the present invention provides a method of manufacturing an oriented electrical steel sheet, including: providing a slab including Si at 1.0 to 4.0 wt %, C at 0.1 to 0.4 wt %, and the remaining portion including Fe and other inevitably incorporated impurities; reheating the slab; producing a hot rolled steel sheet by hot rolling the slab; performing annealing of the hot rolled steel sheet; cold rolling the annealed hot rolled steel sheet; decarburizing and primary annealing the cold rolled steel sheet; cold rolling the decarburized and annealed steel sheet; and secondary annealing the cold rolled steel sheet.Type: ApplicationFiled: May 12, 2021Publication date: August 26, 2021Inventors: Hyun-Seok KO, Kyu-Seok HAN, Hyung-Ki PARK, Jin-Wook SEO, Jae-Soo LIM, Hyung Don JOO
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Patent number: 11066717Abstract: A manufacturing method of an oriented electrical steel sheet according to an exemplary embodiment of the present invention includes: a step of manufacturing a steel slab including one kind or more among Si at 2 to 7%, Sn at 0.03 to 0.10%, and Sb at 0.01 to 0.05% as wt %; a step of hot-rolling the steel slab to manufacture a hot rolled sheet; a step of cold-rolling the hot rolled sheet to manufacture a cold rolled sheet; a step of decarburizing and nitriding the cold rolled sheet for primary recrystallization annealing; a step of coating and drying an annealing separating agent on the primary recrystallization-annealed cold rolled sheet; and a step of secondary recrystallization-annealing the cold rolled sheet coated with the annealing separating agent.Type: GrantFiled: December 20, 2016Date of Patent: July 20, 2021Assignee: POSCOInventors: Chang Soo Park, Min Soo Han, Jong Ho Park, Hyung Don Joo, Yun Su Kim
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Patent number: 11031162Abstract: Disclosed are an oriented electrical steel sheet and a manufacturing method thereof. An exemplary embodiment of the present invention provides a method of manufacturing an oriented electrical steel sheet, including: providing a slab including Si at 1.0 to 4.0 wt %, C at 0.1 to 0.4 wt %, and the remaining portion including Fe and other inevitably incorporated impurities; reheating the slab; producing a hot rolled steel sheet by hot rolling the slab; performing annealing of the hot rolled steel sheet; cold rolling the annealed hot rolled steel sheet; decarburizing and annealing the cold rolled steel sheet; cold rolling the decarburized and annealed steel sheet; and final annealing the cold rolled steel sheet.Type: GrantFiled: December 8, 2014Date of Patent: June 8, 2021Assignee: POSCOInventors: Hyun-Seok Ko, Kyu-Seok Han, Hyung-Ki Park, Jin-Wook Seo, Jae-Soo Lim, Hyung Don Joo
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Publication number: 20210130918Abstract: A grain-oriented electrical steel sheet according to an embodiment of the present includes Si at 1.0 wt % to 7.0 wt %, C at 0.005 wt % or less (excluding 0 wt %), In at 0.001 wt % to 0.5 wt %, and the remainder including Fe and other impurities unavoidably added thereto.Type: ApplicationFiled: December 20, 2017Publication date: May 6, 2021Inventors: Hyung Don JOO, Min Soo HAN, Hyung Ki PARK, Sang Woo LEE, Jin-Wook SEO
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Patent number: 10907231Abstract: An oriented electrical steel sheet according to an exemplary embodiment of the present invention includes Si: 2.0 to 7.0%, C: 0.005% or less (excluding 0%), Al: 0.05% or less (excluding 0%), N: 0.005% or less (excluding 0%), S: 0.005% or less (excluding 0%), a content of each of Ba and Y or a sum thereof: 0.001 to 0.3%, and Fe and other unavoidable impurities as a balance by wt %.Type: GrantFiled: December 22, 2016Date of Patent: February 2, 2021Assignee: POSCOInventors: Hyung Don Joo, Hyung Ki Park, Jin Wook Seo, Sang Woo Lee
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Patent number: 10851431Abstract: A method for manufacturing a grain-oriented electrical steel sheet, according to an embodiment of the present invention includes: heating a slab, based on 100 wt % of a total composition thereof, including N at 0.0005 wt % to 0.015 wt %, Ti at 0.0001 wt % to 0.020 wt %, V at 0.0001 wt % to 0.020 wt %, Nb at 0.0001 wt % to 0.020 wt %, B at 0.0001 wt % to 0.020 wt %, and the remaining portion including Fe and other impurities, and then hot rolling it to prepare a hot-rolled steel sheet; annealing the hot-rolled steel sheet; after the hot-rolled steel sheet is annealed, cooling the hot-rolled steel sheet, and then cold rolling it to prepare a cold-rolled steel sheet; decarburization-annealing the cold-rolled steel sheet and then nitriding-annealing it, or simultaneously performing the decarburization-annealing and the nitriding-annealing; and final-annealing the decarburization-annealed and nitriding-annealed steel sheet.Type: GrantFiled: December 18, 2015Date of Patent: December 1, 2020Assignee: POSCOInventors: Kyu-Seok Han, Hyung Don Joo, Jong-Tae Park, Jin-Wook Seo, Hyun-Seok Ko
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Patent number: 10760141Abstract: An oriented electrical steel sheet includes Ba at about 0.005 wt % to about 0.5 wt % inclusive, Y at about 0.005 wt % to about 0.5 wt % inclusive, or a composite of Ba and Y at about 0.005 wt % to about 0.5 wt % inclusive, the remainder including Fe and impurities, based on 100 wt % of a total composition of a base steel sheet thereof.Type: GrantFiled: December 16, 2014Date of Patent: September 1, 2020Assignee: POSCOInventors: Hyung Don Joo, Hyung-Ki Park, Jin-Wook Seo, Kyu-Seok Han, Jae-Soo Lim, Hyun-Seok Ko
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Publication number: 20200032363Abstract: A method for producing a grain-oriented electrical steel sheet according to an embodiment of the present invention comprises the steps of: heating a slab satisfying the following formula 1 and including, by wt %, 3.2 to 4.0% of Si, 0.03 to 0.09% of C, 0.015 to 0.040% of A1, 0.04 to 0.15% of Mn, 0.001 to 0.005% of N, 0.01% or less of S (exclusive of 0%), and the balance of Fe and other inevitable impurities; hot rolling the slab to produce a hot rolled sheet; hot band annealing the hot rolled sheet to at a cracking temperature of 900 to 980? for 30 to 300 seconds; cold rolling the hot rolled sheet, which has completely been hot band annealed, to produce a cold rolled sheet; subjecting the cold rolled sheet to primary recrystallization annealing; and conducting secondary recrystallization annealing for the cold rolled sheet which has completely been primary recrystallization annealed. [Mn]×[S]?0.0004??[Formula 1] (wherein [Mn] and [S] are contents (wt %) of Mn and S in the slab, respectively.Type: ApplicationFiled: December 21, 2017Publication date: January 30, 2020Inventors: Kyung Jun KO, Hyung Don JOO, Sang Woo LEE, IL Nam YANG
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Publication number: 20190323105Abstract: A grain-oriented electrical steel sheet of an embodiment of the present invention comprises Si: 1.0% to 7.0% and Y: 0.005% to 0.5% by wt %, and the remainder comprising Fe and other inevitable impurities, and 10 pieces or less of inclusions comprising Y and having a diameter of 30 nm to 5 ?m per area of 1 mm2.Type: ApplicationFiled: December 21, 2017Publication date: October 24, 2019Applicants: POSCO, POSCOInventors: Chang Soo Park, Kyu-Seok Han, Hyung Don Joo, Jae Kyoum Kim, Woo-Sin Kim