Abstract: A method and system of fixing carbon dioxide is provided. After metal ion components are extracted from, e.g., natural mineral or steel slag through acid treatment, carbon dioxide is injected to fix carbon dioxide by carbonating the same. Since the procedure of pH adjustment is unnecessary, the reaction is carried out effectively and a continuous process is enabled. Accordingly, the disclosed method of fixing carbon dioxide enables effective removal of carbon dioxide produced from the steelmaking industry, thereby significantly reducing greenhouse gas emission and allowing recycling of the discarded steel slag.

Abstract: An apparatus for measuring the temperature of a rolling material is capable of accurately measuring the temperature of a rolling material by putting a temperature-measuring unit in contact with a surface of the rolling material that is extracted from a heating furnace and conveyed on a roller table to the next process, and moving the temperature-measuring unit contacting the surface of the rolling material together with the rolling material in the conveyed direction thereof.

Abstract: The present invention relates to a system fixing carbon dioxide. The system comprises a first reactor for extracting alkali metal components from a slag and a second reactor for carbonating the extracted alkali metal component with carbon dioxide. With this system, carbon dioxide can be fixed in a simpler and cost-effective manner.

Abstract: A device for measuring a speed of a material includes a body unit disposed at an exit side of a rolling stand and placed below a material which is transferred from the rolling stand; and a speed measuring unit installed on the body unit and constructed to measure a speed of the material transferred from the rolling stand.

Abstract: The present disclosure relates to a high strength steel sheet having good wettability, a tensile strength of 590 MPa or more and a strength-ductility balance (TS×El) of 16,520 MPa·% or more, and a manufacturing method thereof. The high strength steel comprises, in % by weight, C: 0.03˜0.1%, Si: 0.005˜0.105%, Mn: 1.0˜3.0%, P: 0.005˜0.04%, S: 0.003% or less, N: 0.003˜0.008%, Al: 0.05˜0.4%, Mo or Cr satisfying the inequality 10?50·[Mo %]+100·[Cr %]?30, at least one of Ti: 0.005˜0.020%, V: 0.005˜0.050% and B: 0.0005˜0.0015%, and the balance of Fe and unavoidable impurities, wherein a microstructure of the steel sheet is a multi-phase structure comprising, in an area ratio of cross-sectional structure, 70% or more ferrite phase having a Vickers hardness Hv of 120˜250 and 10% or more martensite phase having a Vickers hardness Hv of 321˜555.

Abstract: An apparatus for recovering valuable metals and manufacturing multifunctional aggregate from slag. The apparatus includes a slag reforming processing pot 10 in which molten slag discharged from a converter or an electric furnace is stored, a reducing agent introducing part 20 which introduces a reducing agent into the slag reforming processing pot from above, the reducing agent recovering valuable metals from the molten slag, a reducing agent inflow part 25 which inputs a reducing agent into the slag reforming processing pot through a lower portion of a side of the slag reforming processing pot, the reducing agent recovering valuable metals from the molten slag, and cooling units 30 and 40 which create bubbles and perform controlled cooling in order to convert the molten slag, from which the valuable metals are recovered, into a light material having a porous structure.

Abstract: An apparatus for measuring the shape of a material includes: a width roller configured to roll a width of the material; a plurality of transfer rollers arranged in a rear side of the width roller to transfer the width rolled material; and a measurement unit disposed between the transfer rollers to contact the material moved over the transfer rollers to measure the shape of the material.

Abstract: A material heating method includes: a step of charging a silicon-containing carbon steel material into a heating furnace; a step of preheating the material; a first heating step of raising the temperature of the material; a second heating step of lowering the temperature of the material so as to reduce a temperature difference between the surface and inside of the material; a third heating step of raising the temperature of the material; and a soaking step of reducing the temperature difference between the surface and inside of the material. The temperature of the material in the heating furnace is maintained at the melting point of fayalite or lower.

Abstract: A steam-blocking apparatus includes: a rolling mill configured to roll a material; a transfer roller disposed at a rear side of the rolling mill and configured to transfer the material from the rolling mill; a descaler disposed above the transfer roller and configured to spray wash water toward the transfer roller; a width-measuring part disposed at a rear side of the descaler and configured to measure the width of the material; and a shield disposed between the descaler and the width-measuring part and configured to prevent steam, generated from evaporation of the wash water, from being introduced into the width-measuring part.

Abstract: Disclosed herein is a roof for an electric furnace. The roof includes: a small-ceiling seating port (120) which has a small-ceiling seating surface (122) and a small-ceiling support surface (124) that extends from the small-ceiling seating surface inwards and downwards; and a large ceiling (130) which has an upper roof panel (132) that radially extends from the small-ceiling seating port at a downward inclination angle, a lower roof panel (134) disposed below the upper roof panel at a position spaced apart from the upper roof panel, and a side roof panel (136) connected to the upper roof panel and the lower roof panel. The upper roof panel is connected to the outer circumferential surface of the small-ceiling seating port, and the lower roof panel is connected to a lower end of the small-ceiling support surface so that the inclination angle of the lower roof panel can be increased.

Abstract: The present invention relates to a roof for a ladle furnace which can be compatible with a dust collection elbow or with a dust collection hood. The roof according to the present invention includes a side part (102) which has a vertical cylindrical shape, and a cover part (104) which covers an upper end of the side part. A first seating hole (110) is formed in a central portion of the cover part, and a second seating hole (112) is formed in the cover part at a position adjacent to the first seating hole. A small ceiling (160) or a dust collection hood (170) is selectively seated into the first seating hole. A dust collection elbow (180) or a water cooling panel (190) is selectively seated into the second seating hole.

Abstract: Disclosed is a method and apparatus for recovering valuable metals from slag and manufacturing multifunctional aggregate, wherein a reducing agent is fed into molten slag discharged into a slag pot or a slag reforming pot from a converter or an electric arc furnace thus recovering valuable metals from the molten slag, and then the molten slag is formed into a lightweight porous structure. Accordingly, the valuable metals (Fe, Mn) are recovered from the slag discharged from the converter or electric arc furnace, and slag having low specific gravity is ensured using foaming and controlled cooling and then formed into multifunctional aggregate.

Abstract: A method for evaluating center segregation of a continuous cast slab is provided. The method of the present invention includes (A) creating a center segregation image of a slab using an etching solution comprising a picric acid (C6H3N3O7), a cupric chloride (CuCl2), sodium laurylbenzenesulfonate (C18H29SO3Na) and the remainder of distilled water; and (B) evaluating the center segregation of a slab by scanning the image and applying the following Formula. The method creates an image of center segregation even for low-carbon steel having carbon (C) in an amount of 0.04 wt % or less as well as ultra low-sulfur steel having sulfur (S) in an amount of 50 ppm or less.

Abstract: The present invention relates to an apparatus for atomizing molten slag and recovering valuable metals, and more particularly to an apparatus for atomizing molten slag and recovering valuable metals, which enables molten slag of a blast furnace or a converter or an electric furnace to be atomized and valuable metals to be recovered.

Abstract: Disclosed are a steel plate for a line pipe having excellent hydrogen induced crack resistance with a tensile strength of 450 MPa or more, and a preparation method thereof. According to the present invention, the steel plate for a line pipe, having excellent hydrogen induced crack resistance comprises: 0.03-0.05 wt % of carbon (C); 0.2-0.3 wt % of silicon (Si); 0.5-1.3 wt % of manganese (Mn); 0.010 wt % or less of phosphorus (P); 0.005 wt % or less of sulfur (S); 0.02-0.05 wt % of aluminum (Al); 0.2-0.5 wt % of nickel (Ni); 0.2-0.3 wt % of chromium (Cr); 0.03-0.05 wt % of niobium (Nb); 0.02-0.05 wt % of vanadium (V); 0.01-0.02 wt % of titanium (Ti); 0.001-0.004 wt % of calcium (Ca); and a balance of iron (Fe) and inevitable impurities, and has a tensile strength of 450 MPa or more.

Abstract: The present invention relates to a scrap compactor and to an apparatus for manufacturing same. The apparatus for manufacturing scrap compactors includes a core by means of which a through-hole can be formed in a scrap compactor (S), improves the melting behavior of the scrap compactor by means of the through-hole (h), and also has the effect of preventing the deliberate misrepresentation of the weight of the contents of the scrap compactor carried out by inserting heavy substances into the scrap compactor instead of scrap.

Abstract: The present invention relates to a system and method for diagnosing cracking in a solidified shell in a mold, in which whether longitudinal cracking has occurred in the solidified shell can be diagnosed in real time by using a variation in temperature of the solidified shell in the mold during a continuous casting process. The system comprises: a plurality of temperature sensors arranged in a matrix form in a mold, wherein the plurality of temperature sensors are divided into a first group and a second group based on where cracking occurs; and a processor configured to: calculate a temperature difference between the temperature of the first group and the temperature of the second group from the temperatures detected by the plurality of temperature sensors; and determine, using the calculated temperature difference, whether cracking has occurred in a solidified shell discharged from the mold.

Abstract: The present invention relates to a method for predicting the degree of contamination of molten steel during ladle exchange. The method comprises: setting a casting quantity (Q) and a residual quantity of residual molten steel (Qrm); calculating, based upon the Qrm with proportional coefficients, a casting amount (Qplug) and a casting amount (Qpeak); determining preliminary degrees of contamination; and selecting the smaller of the preliminary degrees to obtain degrees of contamination.

Abstract: The present invention relates to an apparatus for turning steel products. The apparatus comprises a rotating shaft, a first turning plate, and a second turning plate. The first turning plate is fixedly mounted to the rotating shaft with a longitudinal axis of the first turning plate perpendicular to a longitudinal axis of the rotating shaft. The second turning plate is movably mounted to the rotating shaft with a longitudinal axis of the second turning plate perpendicular to a longitudinal axis of the rotating shaft.

Abstract: This invention relates to an ultra-high-strength steel bar and to a method of manufacturing the same, in which the steel bar includes C: 0.05 to 0.45 wt %, Si: 0.10 to 0.35 wt %, Mn: 0.1 to 0.85 wt %, Cr: 0.6 to 1.20 wt %, and Mo: 0.05 to 0.35 wt %, with the remainder being Fe, wherein a martensite structure is formed at a surface layer and a fine ferrite structure is formed at a center layer.