Abstract: The present invention pertains to: a hot-rolled steel plate; a steel tube; and methods for manufacturing the steel plate and steel tube. More specifically, the present invention pertains to: a high manganese hot-rolled steel plate having excellent abrasion resistance; a steel tube manufactured using the hot-rolled steel plate; and methods for manufacturing the steel plate and steel tube.

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: A furnace for producing a secondary battery cathode material according to an exemplary embodiment of the present invention includes; a chamber of which the internal space is heated by a heater, a conveyer installed in the chamber and conveying a sagger containing raw material power of a cathode material of a secondary battery in one direction; and a gas supply nozzle and an exhaust port installed in the chamber. The chamber is divided into a front chamber, an intermediate chamber, and a rear chamber. The intermediate chamber has an inlet shutter and an outlet shutter for sealing the internal space thereof, and an exhaust port of the intermediate chamber is connected to an exhaust device for discharging gas.

Abstract: A grain-orientation electrical steel sheet according to an exemplary embodiment of the present invention includes a linear groove formed in a direction intersecting with the rolling direction, the groove includes the gradient section and the uniform section on a cross section including the transverse direction of the groove and the rolling surface normal direction of the steel sheet, and a length of the gradient section (GS) and the length of the uniform section (US) satisfy Equation 1 below. 0.1?[GSL]/[USL]?0.5??[Equation 1] In Equation 1, [GSL] represents the length (mm) of the gradient section and [USL] represents the length (mm) of the uniform section.

Abstract: The present invention relates to a steel plate for use in ships and the like, which has excellent toughness in a heat-affected zone (HAZ), even when a steel material having high strength and high ductility is welded with a certain amount of heat input or more, and to a method for manufacturing same.

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 an austenitic stainless steel including, in percent by weight (wt %), 0.005 to 0.03% of C, 0.1 to 1% of Si, 0.1 to 2% of Mn, 0.01 to 0.4 of Cu, 0.01 to 0.2 of Mo, 6 to 9% of Ni, 16 to 19% of Cr, 0.01 to 0.2% of N, and the balance of Fe and inevitable impurities, wherein an austenitic stability parameter (ASP) value calculated by 551?462 (C+N)?9.2Si?8.1Mn?13.7Cr?29 (Ni+Cu)?18.5Mo is from 30 to 60, a [100*N]/[Ni+Cu] value is 1.4 or more, an average grain size is less than 5 ?m, and a fraction (%) of grains with a grain size of 5 ?m or more is less than 10%.

Abstract: A side sill for a vehicle according to one embodiment of the present disclosure comprises: a side sill frame formed to have a hollow portion; a first reinforcing frame disposed in the hollow portion and attached to the side sill; a second reinforcing frame disposed in the hollow portion and attached to the first reinforcing frame and the side sill frame, wherein the first reinforcing frame and the second reinforcing frame are disposed in the hollow portion so as to form a closed cross-section in the hollow portion from a thickness-wise cross-section of the side sill frame.

Abstract: Provided is a method for recovering lithium from a waste lithium battery cell including: heat treating a mixture including a waste lithium battery cell and an additive; and trapping a lithium salt produced in the heat treating.

Abstract: An apparatus for controlling coating weight coated on a strip by using an air knife disposed in a travelling direction of the strip in a continuous plating process in which the strip is dipped in a molten metal pot and is coated includes: a prediction model unit including a prediction model in which a neural network is trained with accumulated operation conditions; and an optimum air knife condition calculation unit configured to derive an absolute value of at least one of an air knife gap and an air knife pressure by using the prediction model based on an input operation condition.

Abstract: Disclosed is an austenitic stainless steel with improved corrosion resistance and machinability. The austenitic stainless steel with improved corrosion resistance and machinability may comprise, in percent by weight (wt %), 0.05% or less of C (excluding 0), 2% or less of Si (excluding 0), 2% or less of Mn (excluding 0), 0.01% or less of S, 16 to 22% of Cr, 9 to 15% of Ni, 3% or less of Mo (excluding 0), 0.15 to 0.25% of N, 0.004 to 0.06% of B, and the remainder being Fe and inevitable impurities.

Abstract: The present invention relates to a self-bonding electrical steel sheet and a laminate comprising same, the self-bonding electrical steel sheet comprising an electrical steel sheet and a self-bonding layer positioned on the electrical steel sheet, wherein the amount of inorganic material in the self-bonding layer is 5-35 wt % and the tensile/shear strength of the laminate is 7.5-20 N/mm2.

Abstract: A melt transportation apparatus according to an embodiment of the present invention comprises: a container having an internal space in which melt can be accommodated and an opening through which the melt can be input/output; a cover part which has a cover member capable of closing the opening and which is positioned at the top of the container so as to be movable forward/backward with respect to the opening; and a support part having a rotary body, which can move forward/backward with respect to the cover part at the bottom of the cover part so that the support part can be in contact with the cover part. Therefore, according to embodiments of the present invention, the opening of the container can be easily opened/closed in a limited space. In addition, when the opening is opened/closed by moving the cover part, sagging or tilting of the cover part can be prevented. Thus, the cover part can be easily moved and exposure of at least a portion of the opening to the outside can be prevented.

Abstract: The present disclosure relates to: a plated steel sheet which is for hot forming, has excellent hydrogen embrittlement resistance, and includes an Al-based plating layer formed on the surface of a base steel sheet, wherein the average Ni content in the Al-based plating layer is 0.05 to 0.35 wt %; and a method for manufacturing same.

Abstract: Disclosed are a stainless steel for a fuel cell separator and a method of manufacturing the same. The stainless steel has a low contact resistance as a material for a fuel cell separator and surface roughness parameters that may represent a surface shape of the stainless steel are defined and provided. Specifically, the present disclosure provides a stainless steel for a fuel cell separator with excellent contact resistance and a method of manufacturing the same. The stainless steel includes, in percent by weight (wt %), more than 0 but not more than 0.02% of C, more than 0 but not more than 0.02% of N, more than 0 but not more than 0.4% of Si, more than 0 but not more than 0.3% of Mn, more than 0 but not more than 0.04% of P, more than 0 but not more than 0.02% of S, 15 to 34% of Cr, more than 0 but not more than 1% of Cu, more than 0 but not more than 0.4% of Ni, more than 0 or not more than 0.

Abstract: A non-oriented electrical steel sheet, according to one embodiment of the present invention includes, by weight %, Si: 3.0 to 4.0%, Al: 0.3 to 1.5%, Mn: 0.1 to 0.6%, at least one from among Sn and Sb: 0.006 to 0.1%, C: 0.0015 to 0.0040%, Cr. 0.01 to 0.03%, Cu: 0.003 to 0.008%, Mg: 0.0005 to 0.0025%, and a balance of Fe and inevitable impurities.

Abstract: It is related to a positive electrode active material for lithium secondary battery, comprising: a compound represented by Chemical Formula 1, wherein a molar content of lithium present in the structure of the positive electrode active material, measured through neutron diffraction analysis, is 1.01 to 1.15 for 1 mole of the positive electrode active material, a method of preparing it, and a lithium secondary battery including the same. Li1+a(NibM11-b)1-aO2??[Chemical Formula 1] In the Chemical Formula 1, 0<a<0.2, 0.8<b<1, M1 is at least one element selected from Co, Mn, Al, Mg, Ca, Ti, V, Cr, Zr, Nb, Mo, and W.

Abstract: The present invention relates to a non-grain-oriented electrical steel sheet which is excellent in high-frequency iron loss, and a manufacturing method thereof. A non-grain-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes 2.5 to 3.8 wt % of Si, 0.5 to 2.5 wt % of Al, 0.2 to 4.5 wt % of Mn, 0.0005 to 0.02 wt % of As, 0.0005 to 0.01 wt % of Bi, the balance Fe, and inevitable impurities, and satisfies the following [Equation 1]. 0.3?[surface fine crystal grain diameter]×[fine grain formation thickness]×([As]/[Bi])?5.0??[Equation 1] In Equation 1, [surface fine crystal grain diameter] means an average particle diameter (?m) of fine crystal grains in an electrode surface layer of an electrical steel sheet, [fine grain formation thickness] means a thickness (mm) of an electrode surface layer in which fine crystal grains are formed, and [As] and [Bi] mean a composition (wt %) of As and a composition (wt %) of Bi, respectively.

Abstract: An aspect of the present invention relates to 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 %).