Abstract: 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.

Abstract: 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.

Abstract: 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 ?m to 20 ?m, and an internal oxide layer formed directly below the surface has a thickness of 10 ?m or less; and a method for manufacturing same.

Abstract: 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.

Abstract: Provided according to one embodiment of the present invention are a non-magnetic steel material and a method for manufacturing the same. The steel material comprises 15-27 wt % of manganese, 0.1-1.1 wt % of carbon, 0.05-0.50 wt % of silicon, 0.03 wt % or less (0% exclusive) of phosphorus, 0.01 wt % or less (0% exclusive) of sulfur, 0.050 wt % or less (0% exclusive) of aluminum, 5 wt % or less (0% inclusive) of chromium, 0.01 wt % or less (0% inclusive) of boron, 0.1 wt % or less (0% exclusive) of nitrogen, and a balance amount of Fe and inevitable impurities, has an index of sensitivity of 3.4 or less, the index of sensitivity being represented by the following relational expression (1): [Relational expression 1]?0.451+34.131*P+111.152*Al?799.483*B+0.526*Cr?3.4 (wherein [P], [Al], [B] and [Cr] each mean a wt % of corresponding elements), and contains a microstructure with austenite at an area fraction of 95% or greater therein.

Abstract: 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.

Abstract: The present invention relates to a hot press formed member. A hot press formed member according to one aspect of the present invention comprises a steel sheet; and a plating layer on the steel sheet, wherein a number of voids per 1000 ?m2 of an area from an interface between the plating layer and the steel sheet to 15 ?m is zero and wherein 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 is 7 wt %/?m or less.

Abstract: 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.

Abstract: 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 ?m 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 ?m is 50% or more.

Abstract: 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.

Abstract: 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. The enamel steel sheet according to an exemplary embodiment of the present invention includes an oxide layer in an inside direction from a surface, and a thickness of the oxide layer is 0.006 to 0.030 ?m.

Abstract: 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.

Abstract: In a steel sheet for plating, according to one aspect of the present invention, the CBS profile of an Mn element, which is observed in the direction of surface to depth, sequentially comprises local maximum points and local minimum points, difference of converted concentration of Mn can be 10% or higher, and difference of converted concentration of Si can be 10% or higher.

Abstract: The present invention relates to a method of manufacturing a cryogenic steel plate for a pressure vessel and a cryogenic steel plate for a pressure vessel manufactured thereby, the method comprising the steps of: reheating a slab containing, in weight %, C: 0.05-0.15%, Si: 0.20-0.35%, Mn: 0.5-1.5%, P: 0.012% or less, S: 0.015% or less, Al: 0.02-0.10%, Ni: 6.01-6.49%, Mo: 0.2-0.4%, Cr: and the balance being Fe and inevitable impurities; hot-rolling the reheated steel plate, followed by air cooling; subjecting the air-cooled steel plate to primary heat treatment at 800-880° C. for (2.4×t+(10?40)) minutes (t: slab thickness (mm)), followed by primary water cooling: subjecting the primarily water-cooled steel plate to secondary heat treatment at 700-780° C. for (2.4×t+(10?40)) minutes (t: slab thickness (mm)), followed by secondary water cooling: and tempering the secondarily water-cooled steel plate.

Abstract: The present invention is to provide a steel material having low surface hardness and excellent low temperature impact toughness, and a method for manufacturing same.

Abstract: The present invention provides a steel material for a seismic damper, and a manufacturing method for same. The steel material comprises, in wt %, at most 0.006% of C, at most 0.05% of Si, at most 0.3% of Mn, at most 0.02% of P, at most 0.01% of S, 0.005 to 0.05% of Al, at most 0.005% of N, 48/14×[N] to 0.05% of Ti (here, [N] is the nitrogen content in wt %), 0.04 to 0.15% of Nb, and the remainder in Fe and other unavoidable impurities, and has a ferrite single structure, and has a ferrite grain average particle size of 150 to 500 ?m in a region of a surface layer part, corresponding to 30% of the total thickness from the surface thereof.

Abstract: The present invention relates to a battery case that can effectively handle side impacts in, for example, an electric vehicle or the like, and thereby minimize battery deformation. The battery case comprises: a case body for accommodating a battery cell; and a cover coupled to the case body. The case body includes: a bottom plate; a side frame coupled to the bottom plate so as to surround the battery cell and including an inner wall and an outer wall; a mounting frame coupled to the outer wall of the side frame; and at least one reinforcement material which is disposed on the bottom plate and of which both ends in the longitudinal direction are inserted into the side frame. The ends of the reinforcement material can pass through the inner wall and the outer wall of the side frame and come into contact with the mounting frame.

Abstract: The present invention relates to a front side member for a vehicle, which can effectively support a collision load on the front side and can improve the rigidity of a vehicle body, the front side member for a vehicle, comprising: an outer wall; an inner wall positioned to face the outer wall; an outer bead which is formed, along the lengthwise direction of a vehicle body, from the outer wall and has a first groove surface; and an inner bead which is formed, along the lengthwise direction of the vehicle body, from the inner wall and has a second groove surface, wherein the outer bead comprises an area in which a bead depth that is the distance between the outer wall and the first groove surface changes along the lengthwise direction of the vehicle body, and the inner bead comprises an area in which a bead depth that is the distance between the inner wall and the second groove surface changes along the lengthwise direction of the vehicle body.

Abstract: Disclosed is a stainless steel for a fuel cell separator having excellent surface hydrophilicity and electrical conductivity. According to an embodiment of a stainless steel for a fuel cell separator having excellent surface hydrophilicity and electrical conductivity, the surface oxide element ratio (1) value below may be 0.2 or more and the contact angle may be 80° or less as measured for the surface of a stainless steel containing 15 wt % or more of Cr by X-ray angle-resolved photoemission spectroscopy using an Al-K? X-ray source under the condition where a take-off angle of photoelectrons is from 120 to 85°.

Abstract: A hot-rolled steel sheet comprises, by wt %, 0.1-0.25% of carbon (C), 0.2-2.0% of manganese (Mn), 0.3% or less of silicon (Si), 0.05% or less of aluminum (Al), 0.05% or less of phosphorous (P), 0.03% or less of sulfur (S), 0.01% or less of nitrogen (N), 0.005 to 0.05% of titanium (Ti), 0.0005 to 0.005% of boron (B), 0.01% or less of niobium (Nb), 0.1% or less of molybdenum (Mo), 0.1% or less of vanadium (V), and the balance of iron (Fe) and inevitable impurities, comprises, in a microstructure, 55-90% of bainite and 10-45% of ferrite by volume fraction, the number per unit area of carbides having a major axis length of 25-500 nm from among carbides present in the bainite is 3*106/mm2 or more, and the average aspect ratio (major axis/minor axis) of the carbides present in the bainite can be 2.0 or less.