Abstract: The present invention pertains to a method for producing a graphene-coated steel sheet, the method comprising the steps of: modifying the surface of the steel sheet so that the surface is negatively charged; forming a positively-charged first graphene oxide layer on the surface-modified steel sheet; forming a negatively-charged second graphene oxide layer on the first graphene oxide layer; and heat-treating the steel sheet on which the first and second graphene oxide layers are formed. The present invention provides a graphene coating method which can be easily applied to large-area coating through a simple process without a special dispersant or binder, and has the effect of allowing the excellent physical properties of graphene to be more efficiently exhibited.

Abstract: A wire rod for springs with improved toughness and corrosion fatigue properties is disclosed. The disclosed wire rod comprises by weight percent, carbon (C): 0.4 to 0.7%, silicon (Si): 1.2 to 2.3%, manganese (Mn): 0.2 to 0.8%, chromium (Cr): 0.2 to 0.8%, and a balance of Fe and inevitable impurities, and a grain size is 13.2 ?m or less, and a Charpy impact energy value is 38 J/cm2 or more.

Abstract: Disclosed is a fluidized furnace distribution plate positioned in a fluidized furnace configured to reduce powdered ore, the fluidized furnace distribution plate including a plurality of support beams supported on an inner wall of the fluidized furnace while traversing an interior of the fluidized furnace, and a plurality of grid plates welded to the plurality of support beams and configured to define a single distribution plate shape.

Abstract: The present invention relates to a movable battery pack processing device comprising: a first container to which a discharging module or a cooling module is mounted; and a second container to which a battery pack processed by the discharging module or the cooling module of the first container is transferred and to which a disassembling module for disassembling the battery pack is mounted. According to the present invention, a waste battery disassembling process is modularized, so that cost required for a waste battery processing can be reduced and stability also can be significantly improved.

Abstract: A positive electrode active material for a lithium secondary battery comprising a compound represented by Chemical Formula 1 is introduced. Li1+mNi1-w-x-y-zCowMnxM1yM2zO2-pXp??[Chemical Formula 1] (In the Chemical Formula 1, M1 and M2 are different from each other, and any one element selected from the group consisting of Al, Mg, Zr, Sn, Ca, Ge, Ti, Cr, Fe, Zn, Y, Ba, La, Ce, Sm, Gd, Yb, Sr, Cu and Ga respectively, X is any one element selected from the group consisting of F, N, S, and P, w, x, y, z, p and m are respectively 0.125<w<0.202, 0.153<x<0.225, 0?y?0.1, 0?z?0.1, 0.34?w+x?0.36, 0?p?0.1, and ?0.1?m?0.2.

Abstract: A hot-dip galvanized steel sheet according to one aspect of the present invention comprises a base steel sheet and a hot-dip galvanized layer formed on the surface of the base steel sheet, wherein the difference between the average of the Mn/Si values of surface oxides present on a surface portion, which is the region from the interface between the hot-dip galvanized layer and the base steel sheet to a depth of 15 nm, and the average of the Mn/Si values of internal oxides, which are present in the region from the interface to a depth of 50-100 nm, can be 0.5 or more. Mn and Si of each oxide mean the amounts (wt %) of Mn and Si components in the oxide, which are measured by EDS, and the average of Mn/Si values means the averaged value of the Mn/Si values measured for each oxide.

Abstract: The present invention relates to a steel sheet used in automobiles, etc., and to a steel sheet that has high strength and high formability and is eco-friendly manufactured, and a manufacturing method therefor.

Abstract: Provided is a non-magnetic austenitic stainless steel. According to an embodiment of the disclosed non-magnetic austenitic stainless steel, the non-magnetic austenitic stainless steel includes, in percent by weight (wt %), 0.01 to 0.1% of carbon (C), 1.5% or less (excluding 0) of silicon (Si), 0.5 to 3.5% of manganese (Mn), 16 to 22% of chromium (Cr), 7 to 15% of nickel (Ni), 3% or less of molybdenum (Mo), 0.01 to 0.3% of nitrogen (N), and the remainder of iron (Fe) and inevitable impurities, wherein a value of Expression (1) below is a negative value: (1) 3*(Cr+Mo)+5*Si?65*(C+N)?2*(Ni+Mn)?28, wherein in Expression (1), Cr, Mo, Si, C, N, Ni, and Mn denote contents (wt %) of the alloy elements, respectively.

Abstract: Provided are an ultrathick steel material having excellent strength and low-temperature impact toughness for flanges and a method for manufacturing same. The steel material of the present disclosure comprises, by wt %, C: 0.05-0.2%, Si: 0.05-0.5%, Mn: 1.0-2.0%, Al: 0.005-0.1%, P: 0.01% or less, S: 0.015% or less, Nb: 0.001-0.07%, V: 0.001-0.3%, Ti: 0.001-0.03%, Cr: 0.01-0.3%, Mo: 0.01-0.12%, Cu: 0.01-0.6%, Ni: 0.05-1.0%, Ca: 0.0005-0.004%, and the balance of Fe and inevitable impurities, has Ceq satisfying the range of 0.35-0.55 as calculated by the following equation, has an average ferrite grain size of 25 ?m or less in the central portion thereof, and contains a microstructure including 5-30 area % of pearlite and the balance of ferrite.

Abstract: Provided are a non-quenched and tempered steel rod wire with improved machinability and toughness and a method for manufacturing the same. The non-quenched and tempered steel rod according to the present disclosure includes, in percent by weight (wt %), 0.3% to 0.5% of C, 0.4% to 0.9% of Si, 0.5% to 1.2% of Mn, 0.02% or less of P, 0.01% to 0.05% of S, 0.01% to 0.05% of sol.Al, 0.1% to 0.3% of Cr, 0.01% to 0.02% of Ti, 0.0005% to 0.002% of Ca, 0.007% to 0.02% of N, and the remainder being Fe and inevitable impurities, and includes ferrite and pearlite as microstructures and satisfies Relational Expression 1 below: 2 ? ( Al + Ti ) / N ? 5.

Abstract: Provided are a high-strength galvanized steel sheet having excellent distinctness of image after painting and a manufacturing method therefor. The steel sheet includes: by mass %, 0.003 to 0.005% of C, 0.05% or less of Si, 0.4 to 1.0% of Mn, 0.04 to 0.06% of P, 0.01% or less of S, 0.005% or less of N, 0.1% or less of S. Al, 0.05 to 0.08% of Mo, 0.005 to 0.03% of Ti, 0.02 to 0.035% of Nb, 0.06 to 0.1% of Cu, 0.0015% or less of B, and a balance of Fe and inevitable impurities. The alloy microstructure has ferrite in an amount of 95% by area fraction or greater, and the ferrite has a grain average size of 15 ?m or less, with the ultra-fine grain 5 ?m or less having an occupancy ratio to 7 to 10% within 1 mm×1 mm area.

Abstract: Provided is a method of manufacturing a clad steel sheet. The method includes: preparing a base material including C: 0.3 to 1.0%, Mn: 4.0 to 16.0%, Al: 4.5 to 9.0%, and a remainder of Fe and inevitable impurities; preparing a cladding material including C: 0.1 to 0.45%, Mn: 0.1 to 3.0%, and a remainder of Fe and inevitable impurities; disposing the base material between two of the cladding material to obtain a laminate; welding an edge of the laminate; heating the welded laminate between 1050 and 1350° C.; finish-rolling the heated laminate between 750 and 1050° C. with a rolling reduction ratio of 30% or more in a first pass; coiling the hot-rolled steel sheet between 400 and 700° C.; pickling the coiled hot-rolled steel sheet, and applying a cold-reduction ratio of 35 to 90%; and annealing the cold-rolled steel sheet between 550° C. and A3+200° C. of the cladding material.

Abstract: The present disclosure relates to a lithium compound for recovering valuable metals and a method of recovering the same, and a method of recovering a lithium compound for recovering valuable metals includes: preparing a battery; freezing and forcibly discharging the battery; shredding the battery into a battery shredded material; and heating the battery shredded material, wherein the heating of the battery is performed in a temperature range of 1,100 to 1,400° C., a degree of vacuum (Log P [atm]) in the heating of the battery is in a range of ?4 to 0, a lithium compound recovered through the heating of the battery contains impurities, and the impurities include, by wt %, 1.8 wt % or less (excluding 0 wt %) of Na, 0.06 wt % or less (excluding 0 wt %) of K, 0.62 wt % or less (excluding 0 wt %) of Ca, and 0.47 wt % or less (excluding 0 wt %) of Mg.

Abstract: A graphite steel available as a material for mechanical parts of industrial machines or automobiles, and more particularly, a steel wire for graphitization heat treatment and a graphite steel and methods of manufacturing the same. The graphite steel includes, in percent by weight (wt %), 0.6 to 0.9% of carbon (C), 2.0 to 2.5% of silicon (Si), 0.1 to 0.6% of manganese (Mn), 0.015% or less of phosphorus (P), 0.03% or less of sulfur (S), 0.01 to 0.05% of aluminum (Al), 0.01 to 0.02% of titanium (Ti), 0.0005 to 0.002% of boron (B), 0.003 to 0.015% of nitrogen (N), 0.005% or less of oxygen (O), and the remainder of iron (Fe) and inevitable impurities, and satisfying Equation (1) below: wherein graphite grains are distributed in a ferrite base as a microstructure and a graphitization rate is 100%, (1) ?0.003<[N]?[Ti]/3.43?[B]/0.77<0.003, wherein in Equation (1), [Ti], [N], and [B] are wt % of titanium, nitrogen, and boron, respectively.

Abstract: The present invention relates to a plated steel sheet which can be used for automobiles, home appliances, building materials, etc. and a method for manufacturing same and, more particularly, to a zinc alloy plated steel sheet having excellent adhesion to an adhesive and a method for manufacturing same.

Abstract: One aspect of the present invention is to provide a superior steel plate and a method for manufacturing same, the steel plate, as an ultra-thick steel plate, having high strength as well as superb impact toughness low-temperature, and excellent resistance to formation of cracks.

Abstract: The present invention relates to an ultrasonic testing apparatus with a variable frequency, which can automatically change the frequency according to thickness and thereby detect internal defects in objects having various thicknesses. The ultrasonic testing apparatus may comprise: a nozzle jetting a medium toward an object so as to form a medium column; and a plurality of probes disposed in the nozzle so as to generate ultrasonic waves.

Abstract: A method for monitoring a state of wearing safety protective equipment according to an embodiment includes receiving an image from a site monitoring device installed at an operation site determining whether a work performed in a monitoring area corresponds to a dangerous work by analyzing the image; detecting a target worker and a body area of the target worker when it is determined that the work corresponds to the dangerous work as a result of determining whether the work performed in the monitoring area corresponds to the dangerous work; determining a type of safety protective equipment required for the target worker; and determining the state of the target worker wearing the safety protective equipment.

Abstract: The steel plate material property testing device determining a material property of a surface of the steel plate by generating the eddy current in the steel plate includes: an eddy current tester disposed so as to face the steel plate; and a frame to which the eddy current tester is fixed, in which the eddy current tester includes: a coil disposed so as to form an alternating-current (AC) magnetic field in only one direction; an AC power supply unit connected to the coil; a sensor unit connected to the coil; and a material property determination unit connected to the sensor unit and determining the material property of the steel plate based on a measured signal obtained through the sensor unit.

Abstract: Provided are a high-strength hot-dip galvanized steel sheet with excellent formability and a process for producing same. The steel sheet comprises, in mass %: 0.005 to 0.009% of C; 0.05% or less of Si; 0.3 to 0.8% of Mn; 0.06 to 0.09% of P; 0.01% or less of S; 0.005% or less of N; 0.1% or less of Al; 0.05 to 0.08% of Mo; 0.01 to 0.03% of Ti; 0.03 to 0.045% of Nb; 0.06 to 0.1% of Cu; 0.0015% or less of B; and a balance of Fe and inevitable impurities, and 95% or more of ferrite in terms of area fraction. The ferrite has an average grain size of 15 ?m or less, with ultrafine grains of 6 ?m or less occupying 5 to 10% in a 1 mm×1 mm, and the steel sheet has a surface nanohardness value of 1 to 1.5 GPa.