Abstract: One aspect of the present invention relates to a plated steel sheet for hot press forming, having an excellent impact property.

Abstract: A manufacturing method of a grain-oriented electrical steel sheet according to an embodiment of the present invention, includes: manufacturing a cold-rolled sheet; forming a groove by irradiating a laser beam on the cold-rolled sheet; and partially removing an oxide layer formed on a surface of the cold-rolled sheet so that a thickness of the oxide layer remains at 1 to 5 nm, wherein the grain-oriented electrical steel sheet has islands of 0.25 or less having sphericity of 0.5 to 0.9 under the oxide layer under the groove.

Abstract: Thick high-strength steel having a high yield ratio and excellent durability, and a method for manufacturing same are provided. The thick high-strength steel having a high yield ratio and excellent durability of the present invention comprises, in percentage by weight, C: 0.05 to 0.15%, Si: 0.01 to 1.0%, Mn: 1.0 to 2.3%, Al: 0.01 to 0.1%, Cr: 0.005 to 1.0%, P: 0.001 to 0.05%, S: 0.001 to 0.01%, N: 0.001 to 0.01%, Nb: 0.005 to 0.07%, Ti 0.005 to 0.11%, Fe and unavoidable impurities.

Abstract: Disclosed is a ferritic stainless steel with improved workability and high temperature strength through control of component composition and precipitate distribution, and a manufacturing method thereof. The ferritic stainless steel excellent in workability and high temperature strength according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, C: 0.0005 to 0.02%, N: 0.005 to 0.02%, Si: 0.01 to 1.0%, Mn: 0.01 to 1.2%, P: 0.001 to 0.05%, Cr: 10.0 to 25.0%, Mo: 1.5 to 3.0%, Nb: 0.3 to 0.7%, W: 0.5 to 2.0%, the remainder of iron (Fe) and other inevitable impurities, and the number of precipitates with an average diameter of 0.5 ?m or less is 105 pieces/mm2 or less.

Abstract: A positive active material, a manufacturing method thereof, and a lithium secondary battery including the same are disclosed, and a positive active material including lithium metal oxide particles in a secondary particle form including primary particles, wherein the secondary particle surface includes planar primary particles with a narrow angle of 70 to 90° from among angles between a c axis of the primary particles and a straight line connecting a virtual point of a center of the primary particle and a center point of the secondary particle may be provided.

Abstract: 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 .

Abstract: The present disclosure relates to a lithium hydroxide manufacturing method, which includes: roasting a lithium-containing raw material in sulfuric acid; leaching the roasted lithium-containing raw material to obtain a solution containing lithium sulfate; a first purifying the leaching solution with a pH of 7.1 to 9.5; a second purifying the first purified solution with pH of 9 to 11; and obtaining an aqueous solution of a lithium hydroxide by bipolar electrodialysis of the second purified a solution.

Abstract: The present invention relates to a thick steel suitable for use as a line pipe, a sour-resistant material, or the like and, more specifically, to a high-strength steel having excellent resistance to sulfide stress cracking, and a method for manufacturing same.

Abstract: 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.

Abstract: The present invention provides a method for manufacturing a torsion beam, the method comprising: a planarization step, in which a protruding portion of an upper mold presses the opposite end portions in the width direction of the blank to be plastically deformed to be flat while the opposite end portions in the width direction of the blank are supported by a side cam to face each other; a welding and bonding step for bonding the planarized opposite end portions in the width direction of the blank via welding; and a quenching step for heating the welded and bonded blank within a range of 900 to 970° C. for a retaining time within a range of 1 to 20 minutes and for cooling down the blank in a treatment liquid including at least one of water and oil in a range of 20 to 90° C.

Abstract: Provided is a steel sheet that can be used for automobile parts or the like, and relates to a steel sheet having an excellent balance of strength and ductility, and excellent workability, and a method for manufacturing same.

Abstract: Provided is a bilayer composition for surface treatment of a steel plate and a surface-treated steel plate using same. The bilayer composition for surface treatment of a steel plate, comprising an undercoat coating composition including 1 to 12 wt % of a phenoxy resin, 0.001 to 1.0 wt % of colloidal silica, 0.001 to 1.0 wt % of a silane coupling agent, 0.1 to 1.0 wt % of a corrosion inhibitor, 0.001 to 1.0 wt % of a phosphoric acid compound as a long-term corrosion resistance improving agent, and a balance of water; and a topcoat coating composition including 0.1 to 5.0 wt % of an acrylic acid resin, 30 to 50 wt % of colloidal silica, 40 to 60 wt % of alkoxy silane, 5 to 15 wt % of an acrylate-based monomer, 0.01 to 1.00 wt % of an acidity control agent, and a balance of an organic solvent.

Abstract: Provided is a positive active material for a lithium secondary battery including a compound represented by the following formula 1, wherein, a molar content of lithium present in a structure of the positive active material, measured through neutron diffraction analysis, is 1.02 to 1.15 per mole of the positive active material, and a c-axis lattice constant variation ratio of the R-3m structure is less than 2.3% for charge and discharge in the 2.5 V to 4.25 V range, [Chemical Formula 1] Li1+a(NibM11-b)1-aO2 in formula 1 above, 0<a<0.2, 0.8<b<1, and M1 is one or more elements selected from Co, Mn, Al, Mg, Ca, Ti, V, Cr, Zr, Nb, Mo, and W.

Abstract: An exemplary embodiment of the present invention provides a non-oriented electrical steel sheet and a method for manufacturing same. The non-oriented electrical steel sheet comprises, by wt %, 2.5-4% of Si, 0.1-1.0% of Mn, 0.001-0.005% of S, 0.002-0.01% of Cu, and the remainder of Fe and inevitable impurities, wherein FGS (average grain size of grains in the lower 10% or less based on grain size among total grains)?15 ?m.

Abstract: A preferable aspect of the present invention provides: an ultra-high-strength hot-rolled steel sheet containing, by weight, one or two of 0.40-0.60% of C, 0.7-1.5% of Mn, 0.3% or less (excluding 0%) of Si, 0.03% or less (including 0%) of P, 0.004% or less (including 0%) of S, 0.04% or less (excluding 0%) of Al, 0.3% or less (excluding 0%) of Cr, 0.3% or less (excluding 0%) of Mo, 0.9-1.5% of Ni, and 0.9-1.5% of Cu, 1.1% or more of Cu+Ni, 0.04% or less (excluding 0%) of Ti, 0.005% or less (excluding 0%) of B, 0.006% or less (excluding 0%) of N, and the balance Fe and other impurities, the alloy elements satisfying relational formulas 1 and 2 below, wherein a microstructure of the hot-rolled steel sheet comprises, by volume, 7% or more of ferrite and 93% or less of perlite; a steel pipe and a member each using the same; and manufacturing methods therefor.

Abstract: An exemplary embodiment of the present invention provides: an adhesive coating composition enabling adherence (coupling) of an electrical steel sheet without using conventional coupling methods such as welding, clamping, and interlocking; an electrical steel sheet laminate to which the same is applied; and a method for manufacturing the same. An adhesive coating composition for an electrical steel sheet, according to an exemplary embodiment of the present invention, includes, on the basis of 100 wt % of total solids: 15 to 70 wt % of a first composition containing an organic resin and an organic/inorganic composite in which inorganic nanoparticles are substituted for an organic resin; 20 to 80 wt % of a second composition containing a metal phosphate and phosphoric acid; and 1 to 10 wt % of a coupling agent. The coupling agent may contain one or more of a silane-based coupling agent, a titanate-based coupling agent, and an aluminate-based coupling agent.

Abstract: Disclosed is a steel sheet having excellent hydrophilicity and conductivity. The steel sheet having excellent hydrophilicity and conductivity according to an embodiment may include a joint structure on the steel sheet, wherein the joint structure includes microprotrusions having inter-pitch intervals of 1 to 500 nm in an area fraction of 20% or more.

Abstract: The present invention relates to printing equipment for printing images such as letters, pictures and the like on the surface of metal such as a steel plate, that may stably print images on the surface of metal at high speed, a printing method using the same, and a printed metal material obtained therefrom.

Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention may include, by wt %, 2.5 to 4.0% of Si, 0.1 to 1.5% of A1, 0.1 to 1.5% of Mn, and the remainder of Fe and inevitable impurities. In the non-oriented electrical steel sheet according to an embodiment of the present invention, an average grain size is 50 to 100 ?m, and an area ratio of grains having a grain size of 20 ?m or less is 0.5% or more.

Abstract: Provided is a steel sheet for a hot press formed member having excellent painting adhesion and post-painting corrosion resistance, and a method for manufacturing the same. A steel sheet for hot press forming according to one aspect of the present invention comprises a base steel sheet and a plated layer formed on a surface of the base steel sheet, wherein the ratio of an area occupied by pores to the entire area of a surface layer portion may be 10% or more in a cross section of the surface layer portion observed when the plated layer is cut in a thickness direction thereof.