Abstract: Provided are a plated steel sheet and a method for manufacturing same, the plated steel sheet comprising: a base steel sheet; a Zn—Mg—Al plating layer provided on at least one surface of the base steel sheet; and an Fe—Al inhibition layer provided between the base steel sheet and the Zn—Mg—Al plating layer. The plating layer comprises, by weight %, 4 to 10% of Mg and 5.1-25% of Al and the remainder being Zn and unavoidable impurities with respect to components not including iron (Fe) diffused from the base steel sheet. The plating layer comprises a 24-50% MgZn2 phase in phase fraction. In the MgZn2 phase, an Al single phase is present in the ratio of 1-30% relative to the cross-sectional area of the total MgZn2 phase.

Abstract: The present exemplary embodiments relate to a positive electrode active material, a manufacturing method thereof, and a lithium secondary battery including the same. According to an exemplary embodiment, it is possible to provide a positive electrode active material containing: a lithium metal oxide, and a coating layer positioned on the surface of the lithium metal oxide, and the coating layer comprises a first compound having a peak observed in the range of 1580 cm?1 to 1600 cm?1 when measured by FT-IR and an average transmittance of the peak in the 0.990 to 0.998 range.

Abstract: A roll stamping apparatus includes sets of rollers rotating while facing each other so as to press opposite surfaces of a material which is continuously supplied to move between the rollers; and molding portions having a stamping structure applied to outer surfaces of the sets of rollers so as to mold the material, wherein a plurality of sets of rollers are disposed in a movement direction of the material, the molding portions of the sets of rollers are formed to sequentially change a cross section of the material in the movement direction of the material, wherein at least one of the sets of rollers before a final set of rollers through which the material finally passes is a set of over-molding rollers having molding portions of which a length in a circumferential direction is longer than a length of the molding portions of the final set of rollers.

Abstract: The present disclosure relates to wear-resistant steel comprising, by weight, carbon (C): 0.19 to 0.28%, silicon (Si): 0.1 to 0.7%, manganese (Mn): 0.6 to 1.6%, phosphorus (P): 0.05% or less, sulfur (S): 0.02% or less, aluminum (Al): 0.07% or less, chromium (Cr): 0.01 to 0.5%, nickel (Ni): 0.01 to 3.0%, copper (Cu): 0.01 to 1.5%, molybdenum (Mo): 0.01 to 0.5%, boron (B): 50 ppm or less, and cobalt (Co): 0.02% or less, further comprising one or more selected from the group consisting of titanium (Ti): 0.02% or less, niobium (Nb): 0.05% or less, vanadium (V): 0.05% or less, and calcium (Ca): 2 to 100 ppm, and comprising a remainder of iron (Fe) and other unavoidable impurities, wherein C, Ni, and Cu satisfy the following relationship 1, wherein a microstructure includes 97 area % or more of martensite: C×Ni×Cu?0.05.??[Relationship 1] .

Abstract: An aspect of the present invention is to provide high-strength ultra-thick steel with excellent cryogenic strain aging impact toughness at the center thereof, and a method for manufacturing same. An embodiment of the present invention provides high-strength ultra-thick steel with excellent cryogenic strain aging impact toughness at the center thereof, and a method for manufacturing same, the steel comprising, by wt %, 0.02-0.06% of C, 1.8-2.2% of Mn, 0.7-1.1% of Ni, 0.2-0.5% of Mo, 0.005-0.03% of Nb, 0.005-0.018% of Ti, 80 ppm or less of P, 20 ppm or less of S, and the remainder of Fe and other evitable impurities, wherein the average grain size of grains having a high boundary angle of 15 degrees or greater is 15 ?m or less as measured in a range of ?t-?t in the thickness (t) direction by EBSD.

Abstract: Provided is a high-strength steel sheet having excellent burring workability in a low temperature range, which is mainly used for automobile chassis parts such as members, lower arms, wheel disks, etc.; and a manufacturing method therefor.

Abstract: A cathode active material for a lithium secondary battery includes a nickel-based lithium metal oxide particle doped with Zr and Al. The nickel-based lithium metal oxide particle includes a core portion having a constant molar content of nickel, and a shell portion surrounding an outer surface of the core portion and having a concentration gradient in which a molar content of nickel gradually decreases in a direction from an interface with the core portion to an outermost periphery. The core portion and the shell portion are doped with Al and Zr.

Abstract: An aspect of the present disclosure relates to a high-strength steel material having enhanced resistance to crack initiation and propagation at low temperature.

Abstract: Provided is an ultra-high-strength steel sheet having an excellent hole expandability and yield ratio, including, in terms of wt %: 0.05-0.2% of carbon (C); 2.0% or less of silicon (Si); 4.1-9.0% of manganese (Mn); 0.05% or less (excluding 0%) of phosphorus (P); 0.02% or less (excluding 0%) of sulfur (S); 0.5% or less (excluding 0%) of aluminum (Al); 0.02% or less (excluding 0%) of nitrogen (N); and a balance of iron (Fe) and other inevitable impurities, wherein the following Equation 1 is satisfied, and wherein microstructures includes, in volume percentage, 10-30% or retained austenite, 50% or more of annealed martensite, and 20% or less of other phases including alpha martensite and epsilon martensite, Equation 1: C/12+Ti/48+Nb/93+V/51+Mo/96?0.015.

Abstract: A micro-grid system with a power supply is disclosed according to one embodiment of the present invention. The micro-grid system with a power supply, according to one embodiment of the present invention, comprises: a first node having AC power applied thereto from a bus system; a first generator for applying DC power to a second node; a first load for receiving the AC power by being connected to a third node; a second load for receiving the DC power by being connected to the second node; a third load for receiving the AC power by being connected to a fourth node; a first converter for converting the DC power of the second node to AC power, and outputting same; a second converter for converting the DC power of the second node to AC power, and outputting same; and a switch unit for, according to the statuses of the first converter and the second converter, regulating the connection relations between the first node, the third node, the fourth node, the first converter and the second converter.

Abstract: Disclosed are a high-strength and non-plated steel sheet which is for hot forming and may be suitable for use in automotive structural members that require collision resistance characteristics, a hot-formed member, and a method for manufacturing same. A steel sheet for hot forming and a hot-formed member according to an embodiment of the present disclosure contain, in percent by weight (wt %), 0.05 to 0.3% of carbon (C), 0.5 to 3.0% of silicon (Si), 0.1 to 2.0% of manganese (Mn), 3.0 to 9.0% of chromium (Cr), more than 0% and less than 0.2% of nitrogen (N), and 0.03 to 1.0% of niobium (Nb), with the remainder comprising iron (Fe) and inevitable impurities.

Abstract: Provided is a steel plate for a pressure vessel with excellent cryogenic lateral expansion and a manufacturing method therefor. The steel plate for a pressure vessel according to the present invention comprises, by wt %, 0.05 to 0.15% of C, 0.20 to 0.40% of Si, 0.3 to 0.6% of Mn, 0.015% or less of P, 0.015% or less of S, 0.02 to 0.10% of Al, 4.5 to 5.5% of Ni, 0.2 to 0.4% of Mo, 0.001 to 0.15% of Pd, with a remainder of Fe and inevitable impurities, and the steel plate has a steel microstructure comprising, by area fraction, 0.5 to 5.0% of retained austenite, 25 to 85% of tempered bainite, and a remainder of tempered martensite.

Abstract: The present invention relates to a side sill of a vehicle, the side sill being structurally more robust while having reduced costs and weight. The side sill of a vehicle according to an embodiment comprises: a side sill internal panel; a side sill external panel which is spaced apart from the side sill internal panel; a side sill external reinforcement coupled to the side sill external panel; a partition member arranged between the side sill internal panel and the side sill external reinforcement; a first reinforcing member arranged between the partition member and the side sill internal panel; and a second reinforcing member arranged between the partition member and the side sill external reinforcement.

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 %).

Abstract: Provided is a method for producing alloy steel, the method comprising producing first alloy steel in a temperature holding furnace; maintaining the first alloy steel at a temperature of no lower than a melting point in the temperature holding furnace; and producing second alloy steel having an alloy content lower than the alloy content in the first alloy steel by melt mixing of the first alloy steel and molten steel. In the producing of the alloy steel, melting and storing of the ferroalloy are continuously performed, and thus, the temperature drop of the ferroalloy may be suppressed or prevented.

Abstract: The present disclosure provides a wire rod for cold heading that can shorten the spheroidizing heat treatment time, processed products using the same, and manufacturing method thereof. A wire rod for cold heading according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.15 to 0.5%, Si: 0.1 to 0.4%, Mn: 0.3 to 1.5%, Cr: 0.1 to 1.5%, Al: 0.02 to 0.05%, N: 0.004 to 0.02%, at least one selected from the group consisting of Nb: 0.001 to 0.03%, V: 0.01 to 0.3%, Mo: 0.01 to 0.5%, Ti: 0.001 to 0.03%, and the remainder of iron (Fe) and other inevitable impurities, and the microstructure has a long and short axis ratio of cementite present in pearlite colonies of 200:1 or less.

Abstract: The present invention relates to structural steel that can be desirably used in offshore structures and the like, more specifically, to a thin steel plate having excellent low-temperature toughness and CTOD properties, and to a method for manufacturing the same.

Abstract: Provided are a low-temperature steel plate having excellent impact toughness, and a method for manufacturing same, the low-temperature steel plate comprising, in wt %, 0.02-0.08% C, 6.0-7.5% Ni, 0.5-0.9% Mn, 0.03-0.15% Si, 0.02-0.3% Mo, and 0.1-0.3% Cr, and 50 ppm or less of P, 10 ppm or less of S, and the remainder in Fe and various unavoidable impurities, and the microstructure at ¼t (t: thickness of the steel plate) location of the steel plate comprising, in % surface area, 10-35% tempered bainite, 3-15% residual austenite, and the remainder in tempered martensite, and having granularity of 10 ?m or less of high angle grain boundaries at 15° or greater as measured by Electron Backscatter Diffraction (EBSD).

Abstract: The present invention relates to a seat frame with reduced weight due to not including a cushion side frame, the seat frame comprising: a pair of rails; a cushion frame which supports a cushion and has a closed cross-sectional shape; front links which connect the rails to the cushion frame on the front side; rear links which connect the rails to the cushion frame on the rear side; and connection brackets which connect the rear links to a seatback frame.

Abstract: A plating steel sheet for hot press forming includes: a base steel sheet; an Al—Zn-based plating layer formed on at least one surface of the base steel sheet; and an Fe—Al-based surface alloy layer formed between the base steel sheet and the Al—Zn-based plating layer, wherein the Al—Zn-based plating layer can include 10-30 wt % of Zn, 1 wt % or less of Fe, and the balance of Al and impurities.