Abstract: An annealing separating agent composition for a grain oriented electrical steel sheet according to an embodiment of the present invention contains 25-80 wt % of a boron compound on the basis of 100 wt % of the total solid content, with the remainder comprising at least one among magnesium oxide and magnesium hydroxide.

Abstract: The present exemplary embodiments relate to a sodium ion adsorbent, a method of manufacturing the same, and a method for removing sodium ions. According to an exemplary embodiment, a sodium ion adsorbent for removing sodium ions may include a compound represented by Chemical Formula 1 below. [Chemical Formula 1] HxM1-xAlSi2O6, in Chemical Formula 1, M is one or more elements selected from Na, K, Cs, and Rb, and 0<x?1.

Abstract: The present disclosure provides an electrical steel sheet adhesive coating composition containing a polyurethane resin and an inorganic pigment, wherein the inorganic pigment is contained in an amount of 20 to 150 parts by weight with respect to 100 parts by weight of the polyurethane resin, and the polyurethane resin is formed by reacting an aromatic diisocyanate monomer and a polyol, an electrical steel sheet laminate using the same, and a method for manufacturing the same.

Abstract: A grain oriented electrical steel sheet according to an exemplary embodiment of the present invention includes a grain oriented electrical steel sheet base material and a metal oxide layer present on both sides of the grain oriented electrical steel sheet base material. A maximum Al fraction in the metal oxide layer is 0.15 to 1.0 wt %, and a ratio (DWL/DWS) of an average magnetic domain width (DWL) of a side with a large average magnetic domain width to an average magnetic domain width (DWS) of a side with a small average magnetic domain width of one side and the other side of the electrical steel sheet base material is 1.2 to 1.8.

Abstract: An insulation coating composition for an electrical steel sheet according to an exemplary embodiment of the present disclosure contains, with respect to 100 parts by weight of a solid content, 30 to 60 parts by weight of an organic/inorganic composite in which inorganic nanoparticles are substituted in a resin, 15 to 45 parts by weight of a metal phosphate, 10 to 40 parts by weight of kaolin, 1 to 10 parts by weight of an inorganic dispersant, and 0.1 to 5 parts by weight of a carbon structure.

Abstract: The present invention relates to a high-strength steel sheet having excellent formability and a high yield ratio, and a manufacturing method therefor, and more particularly, to a high-strength steel sheet having excellent formability and a high yield ratio, and a manufacturing method therefor, the steel sheet having various uses such as that of vehicle parts.

Abstract: Provided is a surface treatment solution composition comprising: 30 to 51 wt % of a trivalent chromium compound comprising chromium phosphate (A) and chromium nitrate (B) and having a content ratio of A/(A+B) that satisfies 0.3 to 0.6; 5 to 15 wt % of silane coupling agent; 0.2 to 3 wt % of vanadium-based anti-corrosive rust inhibitor; 3 to 12 wt % of colloidal silica; 0.5 to 5 wt % of polysiloxane copolymer; and 14 to 61.3 wt % of water, a hot dip galvanized steel sheet surface-treated using same, and a manufacturing method thereof. The hot dip galvanized steel sheet treated with the surface treatment solution composition containing trivalent chromium has an excellent corrosion resistance, blackening resistance, pipe-forming oil reactivity, and alkali resistance.

Abstract: The present disclosure provides a pre-stressed steel sheet comprising: a base material; and a plurality of weld lines formed on the base materials, wherein the average spacing between each pair of the weld lines is equal to or greater than five times the width of the weld lines and equal to or less than half the width of the steel sheet.

Abstract: The cryogenic austenitic high-manganese steel having excellent corrosion resistance, according to one aspect of the present invention, comprises 0.2-0.5 wt % of C, 23-28 wt % of Mn, 0.05-0.5 wt % of Si, 0.03 wt % or less of P, 0.005 wt % or less of S, 0.5 wt % or less of Al, and 3-4 wt % of Cr, with the remainder being Fe and other unavoidable impurities, also comprises at least 95 area % of austenite as a microstructure, and has Cr concentration sections continuously formed within an area of 50 ?m in the thickness direction from the surface, wherein the Cr concentration sections comprise a high Cr concentration section having a relatively high concentration of Cr, and a low Cr concentration section having a relatively low concentration of Cr, and the high Cr concentration section may be distributed at 30 area % or less (but not 0%) relative to the whole surface area of the Cr sections.

Abstract: Provided is an aluminum coated steel sheet having excellent anti-corrosion properties and weldability, and a manufacturing method thereof. The aluminum coated steel sheet includes: an austenitic base steel sheet including at least 70 area % of an austenite microstructure; and an aluminum coating layer formed on the base steel sheet, wherein the base steel sheet includes at least 80 area % of ferrite in a surface layer portion, which denotes a region extending from the interface with the coating layer to a depth of 100 ?m into the base steel sheet, and the aluminum coating layer may have a composition comprising 2-12 wt % of Si, 5-30 wt % of Zn, and 0.1-5 wt % of Mn, with the balance being Al and inevitable impurities.

Abstract: Provided are a steel plate for high temperature applications having excellent strength at a high temperature and a method for manufacturing same. The steel plate for high temperature applications having excellent post-weld heat treatment resistance, according to the present invention, comprises by weight percent: C:0.05-0.25%; Mn:0.1-1.0%; Si:0.1-0.8%; Cr:1-3%; Cu:0.05-0.3%; Mo:0.5-1.5%; Ni:0.05-0.5%; Al:0.005-0.1%; and at least one of Ir:0.005-0.10% and Rh:0.005-0.10%, the balance being Fe and inevitable impurities.

Abstract: One embodiment of the present invention provides an ultrahigh-strength steel having excellent cold workability and SSC resistance, comprising, by wt %, carbon (C) in an amount of more than 0.08% and equal to or less than 0.2%, 0.05-0.5% of silicon (Si), 0.5-2% of manganese (Mn), 0.005-0.1% of aluminum (Al), 0.01% or less of phosphorus (P), 0.0015% or less of sulfur (S), 0.001-0.03% of niobium (Nb), 0.001-0.03% of vanadium (V), 0.001-0.03% of titanium (Ti), 0.01-1% of chromium (Cr), 0.01-0.15% of molybdenum (Mo), 0.01-0.5% of copper (Cu), 0.05-4% of nickel (Ni), 0.0005-0.

Abstract: An acid-resistant steel sheet according to an embodiment of the present invention includes, by wt %, equal to or less than 0.1% of C (excluding 0%) and 2.0 to 4.0% of Si, and includes a remainder of Fe and inevitable impurities, and the content of Si of the surface portion by the inward depth of up to 10 ?m from the surface of the steel sheet is equal to or greater than 15 wt %.

Abstract: A welded member includes: a first steel sheet including a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet; and a second steel sheet spot-welded on the first steel sheet and facing the zinc-based plating layer of the first steel sheet, a spot-welded zone being formed between the first steel sheet and the second steel sheet. A surface layer of the base steel sheet has a decarburization ratio of 30% or more. The decarburization ratio is represented by equation: Decarburization ratio (%) of surface layer=(1?average carbon concentration in surface layer/bulk carbon concentration)*100 where the surface layer refers to a region of the base steel sheet from the surface thereof to a depth of 35 ?m. A shoulder portion of the spot-welded zone includes a B-type crack having a length of 100 ?m or less, and no C-type crack.

Abstract: An aspect of the present invention provides: an austenitic high-manganese steel having excellent extreme low temperature toughness in a heat-affected cone; and a method for manufacturing same.

Abstract: According to one aspect of the present invention, an austenitic high-manganese steel having excellent ultra-low temperature toughness in a weld heat-affected zone, and a manufacturing method therefor can be provided.

Abstract: A cold rolled steel sheet according to an exemplary embodiment of the present invention comprises, by wt %: C: 0.01 to 0.10%; Mn: 0.1 to 0.4%; Al: 0.01 to 0.10%; P: 0.003 to 0.020%; N: 0.001 to 0.006%; S: 0.015% or less; Cr: 0.1 to 0.4%; B: 0.0005 to 0.0035%; Ni: 0.04 to 0.10%; and the balance Fe and other unavoidable impurities, and comprises a (Cr—B)(C—N)-based composite precipitate having a size of 0.01 to 0.1 ?m, wherein a [I 222+I 554]/I 200 texture ratio is 5.0 to 10.0, an earing rate is less than 3.0%, and an alloying rate of an alloy layer may be 5 to 15%.

Abstract: A cold-rolled steel sheet, according to one embodiment of the present invention, may comprise in percentage by weight: carbon (C): 0.010-0.025%; manganese (Mn): 0.10-0.25%; sulfur(S): 0.002-0.011%; boron (B): 0.0006-0.0026%; nitrogen (N): 0.0010-0.0034%; aluminum (Al): 0.006-0.028%; and the balance being Fe and unavoidable impurities, and may comprise precipitates of at least one of MnS and BN, wherein the average particle diameter of the precipitates may be 40-250 nm, the area fraction of the precipitates in the cold-rolled steel sheet may be 1-10%, and the yield strength may be 150-220 MPa.

Abstract: The present disclosure relates to a calcium-containing graphite steel wire rod, a steel wire, a graphite steel, and a manufacturing and cutting method thereof, and more particularly, to a cutting method for manufacturing industrial parts, a graphite steel wire rod, a graphite steel, and a manufacturing method therefor.

Abstract: The present disclosure relates to methods for manufacturing a wire rod for cold forging and a screw part, which may manufacture with only quenching heat treatment a part with excellent drilling characteristics, and which may specifically manufacture a part to be used for mechanical coupling of automotive parts manufactured with different materials.