971 patents
Utility
Hot-rolled Steel Sheet for Hyper Train Tube, and Manufacturing Method for Same
18 Jan 24
According to one aspect of the present invention, a hot-rolled steel sheet and a manufacturing method for same may be provided, wherein the hot-rolled steel sheet has excellent yield strength, vibration damping ratio, electrical resistivity, and low-temperature toughness, and thus has properties suitable for use in a hyper train tube.
Hong-Seok Yang, Hak-Jun Kim, Han-Sung Kim, Seung-Min La, Woo-Yeon Cho
Filed: 3 Dec 21
Utility
Hot-rolled Steel Sheet for Hyper Tube and Manufacturing Method Therefor
18 Jan 24
According to one aspect of the present invention, a hot-rolled steel sheet and a manufacturing method for same may be provided, wherein the hot-rolled steel sheet has excellent yield strength, vibration damping ratio, and low-temperature toughness, and thus has physical properties suitable for use in a hyper train tube.
Hong-Seok Yang, Jun-Hak Pak, Seok-Jong Seo
Filed: 3 Dec 21
Utility
Cold-rolled Steel Sheet Having Excellent Processability and Manufacturing Method Thereof
18 Jan 24
A cold-rolled steel sheet having excellent processability according to an exemplary embodiment of the present invention contains, by wt %: 0.012 to 0.060% of C, 0.03% or less (excluding 0%) of Si, 0.1 to 0.4% of Mn, 0.015 to 0.050% of Al, 0.015% or less (excluding 0%) of P, 0.015% or less (excluding 0%) of S, 0.006% or less (excluding 0%) of N, and a balance of Fe and other unavoidable impurities.
Minho JO, Young-Kwang HONG
Filed: 15 Dec 21
Utility
High Toughness High Carbon Cold Rolled Steel Sheet Having Excellent Formability, and Method for Manufacturing Same
18 Jan 24
One embodiment of the present invention provides: a high toughness high carbon cold rolled steel sheet having excellent formability comprising, by weight %, C: 0.80% to 1.25%, Mn: 0.2% to 0.6%, Si: 0.01% to 0.4%, P: 0.005% to 0.02%, S: 0.01% or less, Al: 0.01% to 0.1%, Cr: 0.01% to 1.0%, Sn: 0.05% to 0.5%, the remainder being Fe and other unavoidable impurities, in which a microstructure includes, by area %, retained austenite: 1% to 10%, martensite: 1% to 10%, ferrite: 5% or less (including 0%), the remainder being bainite, and has an average grain size of 3 μm to 20 μm, and an internal oxide layer formed directly below the surface has a thickness of 10 μm or less; and a method for manufacturing same.
Je-Wook JANG, Hak-Jun KIM, Sun-Mi KIM
Filed: 10 Dec 21
Utility
High-strength Austenitic Stainless Steel with Improved Low-temperature Toughness In Hydrogen Environment
18 Jan 24
Disclosed is a high-strength austenitic stainless steel with improved low-temperature toughness in a hydrogen environment.
Kwangmin Kim, Kyung-hun Kim, Han-seop Noh
Filed: 1 Nov 21
Utility
High-strength Hot-dip Galvanized Steel Sheet Having Excellent Plating Quality, Steel Sheet for Plating, and Methods for Manufacturing Same
18 Jan 24
The steel sheet for plating according to an aspect of the present invention has a GDS profile of an Mn element, as observed in the depth direction from the surface, sequentially including a maximum point and a minimum point, wherein a difference of converted concentration of Mn may be 80% or more, and a difference of converged concentration of Si may be 50% or more.
Jin-Ho Jung, Won-Hwi Lee, Ki-Cheol Kang, Seong-Choon Kwon
Filed: 9 Dec 21
Utility
Austenitic steel material having excellent hot workability and manufacturing method therefor
16 Jan 24
Provided according to one embodiment of the present invention are a non-magnetic steel material and a method for manufacturing the same.
Un-Hae Lee, Sung-Kyu Kim, Soon-Gi Lee, Yong-Jin Kim, Hong-Yeol Oh
Filed: 9 Mar 21
Utility
Method for producing hot-dip galvanized steel sheet having excellent press formability and image clarity after painting, and hot-dip galvanized steel sheet produced thereby
16 Jan 24
Provided is a hot-dip galvanized steel sheet used for an automobile outer panel and so forth and, more specifically, to a method for producing a hot-dip galvanized steel sheet having excellent press formability and clarity after painting, and to a hot-dip galvanized steel sheet produced by the method.
Sun-Ho Jeon, Moon-Hi Hong, Jun-Seok Park, Doo-Chan Chang
Filed: 13 Dec 17
Utility
Variable Die, and Pressing Apparatus and Method
11 Jan 24
A variable die according to an embodiment of the present invention may comprise: a first lower die part; and a first upper die part disposed above the first lower die part, wherein: the first lower die part comprises a first lower die center part and a first lower die side part; the first lower die center part includes a first sensor unit which measures a distance; a first lower die side part includes an inner member having a slope, and a drive unit which moves the inner member toward the first lower die center part; the first sensor unit measures a forming distance which is the distance from the first sensor unit to a material; and the driver unit is driven on the basis of the forming distance to adjust a correction distance which is the moving distance of the inner member.
Jae-Wook Lee
Filed: 2 Nov 21
Utility
Steel Sheet for Hot Press Formed Member
11 Jan 24
The present invention relates to a hot press formed member.
Seong-Woo KIM, Jin-Keun OH, A-Ra CHO, Hyeon-Jeong SHIN
Filed: 25 Sep 23
Utility
Steel Sheet for Enamel and Method of Manufacturing the Same
11 Jan 24
An exemplary embodiment of the present invention provides an enamel steel sheet, including: by wt % (% by weight), 0.01 to 0.05% of C, 0.05 to 0.8% of Mn, 0.001 to 0.03% of Si, 0.03 to 0.12% of Al, 0.001 to 0.02% of P, 0.001 to 0.02% of S, 0.004% or less (excluding 0%) of N, 0.001 to 0.003% of B, 0.003% or less (excluding 0%) of O, and the balance of Fe and inevitable impurities.
Jai-Ik Kim
Filed: 4 Nov 21
Utility
High Strength Hot-dip Galvanized Steel Sheet Having Excellent Plating Adhesion and Weldability and Method of Manufacturing Same
11 Jan 24
An embodiment of the present invention provides a high strength hot-dip galvanized steel sheet having excellent plating adhesion and weldability and a method of manufacturing same, wherein: the steel sheet comprises a base steel sheet and a hot-dip galvanized layer formed on one surface or both surfaces of the base steel sheet, the base steel sheet comprising, in weight %, carbon (C): 0.1-0.3%, silicon (Si): 0.1-2.0%, aluminum (Al): 0.1-1.5%, manganese (Mn): 1.5-3.0%, and the balance being Fe and inevitable impurities, the sum of Si and Al satisfying 1.2-3.5%, the ratio (Al/Si) of Al and Si satisfying 0.5-2.0; the steel sheet comprises an internal oxidation layer with a thickness of 1-5 μm directly below the surface of the base steel sheet; and the decarburization rate in a region from directly below the surface of the base steel sheet to 50 μm is 50% or more.
Young-Ha Kim, Myung-Soo Kim, Kwang-Tai Min, Ki-Cheol Kang
Filed: 9 Dec 21
Utility
Bake-hardened Hot-dip Galvanized Steel Sheet with Excellent Powdering Resistance, and Manufacturing Method Therefor
11 Jan 24
Provided are a bake-hardened hot-dip galvanized steel sheet with excellent powdering resistance, and a manufacturing method therefor.
Sang-Hyun KIM, Seong-Ho HAN, Chung-Won KIM, Yu-Mi HA
Filed: 3 Nov 21
Utility
High-strength Hot-dip Galvanized Steel Sheet Having Excellent Surface Quality and Spot Weldability, and Manufacturing Method Therefor
11 Jan 24
According to one aspect of the present invention, a high-strength hot-dip galvanized steel sheet having an excellent surface quality and spot weldability, and a manufacturing method therefor may be provided.
Ki-Cheol Kang, Dae-Young Kang, Nam-A Kim, Myung-Soo Kim
Filed: 7 Dec 21
Utility
High Strength Steel Sheet Having Excellent Workability and Method for Manufacturing Same
11 Jan 24
Provided is a steel sheet that may be used for automobile parts and the like, and to a steel sheet having an excellent balance of strength and ductility, an excellent balance of strength and hole expansion ratio, and an excellent yield ratio evaluation index, and a method for manufacturing the same.
Jae-Hoon LEE, Young-Roc IM
Filed: 1 Dec 21
Utility
Method for Manufacturing Tailor Welded Blank Using Steel Sheet for Hot Pressing Having Al-fe-based Intermetallic Alloy Layer
11 Jan 24
An embodiment of the present invention provides a method for manufacturing a tailor welded blank using a steel sheet for hot pressing having an Al-Fe-based intermetallic alloy layer, the method comprising the steps of: preparing a plated steel sheet having a base steel sheet and an aluminum-based plated layer formed on one surface or both surfaces of the base steel sheet; heat-treating the plated steel sheet so that the aluminum-based plated layer becomes an Al-Fe-based intermetallic alloy layer; and subjecting the heat-treated plated steel sheet to butt welding, wherein, before the welding, a part or the entirety of the Al-Fe-based intermetallic alloy layer located in an area to be welded is removed.
Sang-Ho UHM, Jin-Keun OH
Filed: 17 Dec 21
Utility
High Strength Steel Sheet Having Excellent Workability and Method for Manufacturing Same
11 Jan 24
Provided is a steel sheet which can be used for automobile parts and the like, and relates to a steel sheet and a method for manufacturing same, the steel sheet having an excellent balance between strength and ductility, an excellent balance between strength and hole expansion properties, and an excellent yield ratio evaluation score.
Jae-Hoon LEE, Sang-Ho HAN
Filed: 1 Dec 21
Utility
High-strength Hot-dip Galvanized Steel Sheet with Excellent Formability and Process for Producing Same
11 Jan 24
Provided are a high-strength hot-dip galvanized steel sheet with excellent formability and a process for producing same.
Yu-Mi HA, Jun-Sung YEOM
Filed: 27 Oct 21
Utility
Electric Vehicle Body
4 Jan 24
The present invention relates to an electric vehicle body capable of minimizing the intrusion of a collision load into a passenger space and a battery space during a front-end or rear-end collision, and comprises: a front side member having one side coupled to a front bumper beam, and the other side branching off to include a first branch part and a second branch part; a first front cross member coupled to the first branch part and the second branch part; a side seal coupled to the second branch part; a front subframe coupled to the front side member; and a battery case, which includes a reinforcing member extended in the longitudinal direction of the vehicle body and is coupled to the side seal and the first front cross member.
Hong-Woo Lee, Jaehyun Kim, Dong-Yoon Seok
Filed: 16 Nov 21
Utility
Ultra-high Strength Cold Rolled Steel Sheet Having Excellent Bendability, and Method of Manufacturing Same
4 Jan 24
Provided are an ultra-high strength cold rolled steel sheet having excellent bendability, and a method of manufacturing the same.
Jong-Pan KONG, Yeon-Sang AHN, Joo-Hyun RYU
Filed: 29 Nov 21