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| Number | Title | Issue Date |
| 7935172 | Ironmaking and steelmaking A steelmaking process is disclosed. The process includes producing molten steel and molten steelmaking slag in a steelmaking process, the steelmaking slag including iron units and flux units, and thereafter producing molten iron in a molten bath based direct smeltin... | 05/03/2011 |
| 7537638 | Metallurgical slag A method of making a material for use as a steel-making slag comprises mixing sufficient lime and/or magnesia containing materials with combustion ash until the so-formed composition has a basicity ratio appropriate for use in steel making. ... | 05/26/2009 |
| 7442338 | Product manufacture in structural metallic materials reinforced with carbides The present invention develops a manufacture method, via conventional liquid metallurgy, of finished and semi-finished metallic parts as casting, ingot, blooms and slabs in alloys base Fe, base Ni and base Co, microstructurally reinforced with complex molybdenum and... | 10/28/2008 |
| 7396421 | Duplex stainless steel and manufacturing method thereof A duplex stainless steel containing C, Si, Mn, P, S, Al, Ni, Cr, Mo, N (nitrogen, O (oxygen), Ca, Mg, Cu, B, and W, and the balance Fe and impurities, where a number of oxide-based inclusions, which have a total content of Ca and Mg of 20 to 40% by mass and also hav... | 07/08/2008 |
| 7175691 | Method of producing stainless steel by re-using waste material of stainless steel producing process A method of producing stainless steel includes the steps of melting a raw material in an electric furnace to form molten steel, and then refining the molten steel by a refining furnace to produce stainless steel in a stainless steel producing process. In the method,... | 02/13/2007 |
| 7081172 | Nodular graphite cast iron with high strength and high toughness A nodular graphite cast iron is provided, having a pearlite matrix, with high strength and high toughness. The nodular graphite cast iron consists essentially of, by weight %: from 3.0 to 4.6% of carbon; from 1.6 to 2.5% of silicon; from 0.2 to 0.6% of manganese; fr... | 07/25/2006 |
| 7056400 | Method of separating superalloy metal powder from admixed contaminants A method is provided for separating superalloy metal powder from contaminants, such as process-produced contaminants, by enhancing the magnetic properties thereof, such as by oxidizing or leaching of chromium, for example, followed by magnetic separation of the cont... | 06/06/2006 |
| 6945077 | Method for treating steel plant slag A method is presented for the treatment of slag from electric steel plants which comprises the following steps: (a) transference of the slag into a metallurgical receptacle; (b) defoaming of the slag in this metallurgical receptacle by adding a defoaming agent, pref... | 09/20/2005 |
| 6939388 | Method for making materials having artificially dispersed nano-size phases and articles made therewith A method for forming a nanocomposite material and articles made with the nanocomposite material are presented. The method comprises providing a molten material; providing a nano-sized material, the nano-sized material being substantially inert with respect to the mo... | 09/06/2005 |
| 6638337 | Method of introducing additives in steelmaking The additives, in particulate solid form, are conveyed pneumatically in a divergent stream from a pneumatic gun to impinge upon the molten iron and mix therewith. The gun is spaced above a surface of molten iron such that the pneumatically conveyed stream... | 10/28/2003 |
| 6517605 | Start-up procedure for direct smelting process A procedure for starting up a direct smelting process for producing iron from a metalliferous feed material in a metallurgical vessel is disclosed. The vessel is of the type which includes a plurality of feed material injection lances/tuyeres (11, 13). Th... | 02/11/2003 |
| 6514312 | Steelmaking slag conditioner and method A slag conditioner for extending the life of a BOF vessel lining utilizing recycled blast furnace filter cake dewatered by contact with a hot slag; its process of production, and method of use.... | 02/04/2003 |
| 6508853 | Process for the production of metal melts To be able to produce metal melts using any metal carriers incurring in metallurgical practice as the charging materials, namely in the most diverse quantitative compositions, a plant for producing metal melts is provided with the following characteristic... | 01/21/2003 |
| 6451087 | Method for producing mother alloys for iron-based amorphous alloys The method for producing a mother alloy for an iron-based amorphous alloy has the steps of (a) melting raw materials for elements constituting the amorphous alloy together with at least one oxide of an element constituting the amorphous alloy, the raw mat... | 09/17/2002 |
| 6383249 | Magnesium desulfurization agent A method and composition for removing sulfur from molten ferrous material, particularly molten pig iron. The desulfurization agent includes a magnesium particle coated with a heat absorbing compound. The heat absorbing compound absorbs heat around the mag... | 05/07/2002 |
| 6352570 | Magnesium desulfurization agent A method and composition for removing sulfur from molten ferrous material, particularly molten pig iron. The desulfurization agent includes a magnesium particle coated with a heat absorbing compound. The heat absorbing compound absorbs heat around the mag... | 03/05/2002 |
| 6251159 | Dispersion strengthening by nanophase addition A dispersion strengthening method for metallic melts that are used to form large articles. The method comprises adding nanophase particles into a molten metallic melt and dispersing the nanophase particles in the metallic melt. The nanophase particles com... | 06/26/2001 |
| 6174347 | Basic tundish flux composition for steelmaking processes The tundish flux composition of the invention employs solid recycled ladle metallurgy furnace (LMF) slag as a fluidizing and refining base ingredient in a mixture of raw materials. The preferred recycled LMF slag material comprises about 35% to about 65% ... | 01/16/2001 |
| 6146437 | Metal containing compound reduction and melting process The present invention provides a metal containing compound reduction and melting process which entails feeding a burden made of a mixture of the metal containing compound and a suitable reductant in particulate form into an electrically heatable vessel wh... | 11/14/2000 |
| 6120578 | Method of producing cluster-free Al-killed steel An alloy of Al and two or more of Ca, Mg and REM is added as a deoxidizing agent to molten steel, and the amount of Al2 O3 in the resulting inclusion is adjusted to a range of 30-85 wt % to obtain an alumina cluster-free Al-killed st... | 09/19/2000 |
| 6015448 | Process for pig iron desulphurization Disclosed is a process for desulphurization of a pig iron melt for further processing wherein the melt is brought into close contact with a ground solid slag. As desulphurizing agent, the slag accumulating in secondary steelmaking with a basicity of at le... | 01/18/2000 |
| 5749939 | Melting of NI laterite in making NI alloyed iron or steel A multiple stage process for obtaining Ni units from Ni laterite ores and sulfur-bearing Ni concentrates during production of nickel-alloyed iron, nickel-alloyed steel or nickel-alloyed stainless steel in a reactor equipped with top- and bottom-blowing me... | 05/12/1998 |
| 5567222 | Method of controlling slag coating of a steel converter A method of controlling slag coating in a steel converter in which slag is left in the converter after tapping, and a slag solidifying agent is added to the slag to form a coated slag which is used to coat the bottom and/or side wall surface of the conver... | 10/22/1996 |
| 5395443 | Method for preparing a cement base material, together with a cement composition containing this base material The invention relates to a method for preparing a hydraulically settable cement base material starting from steel slags formed in a steel-making process, which method comprises the formation, in steel slags in the liquid state, of a ferrite gradient by ad... | 03/07/1995 |
| 5348567 | Decontamination method A method for decontamination of steel components contaminated with radioactive material comprises the steps: (a) providing a mass of material including: (i) a proportion of steel carrying radioactive material; and (ii) a mass of slag forming material; (b) melting t... | 09/20/1994 |
| 5284617 | Process for dealuminizing molten cast iron Dealuminizing cast iron by contacting it with free-flowing flux particles having a solid silica core and a molten silica shell wherein said flux comprises silica and about 1% to about 5% calcium fluoride.... | 02/08/1994 |
| 5238484 | Plant for the production of molten metals and method A plant for the production of molten metals, includes a melting vessel and a metallurgical vessel receiving the melt from the melting vessel for aftertreating the melt and closed by a lid. The melting vessel has a tap opening for the melt provided on the ... | 08/24/1993 |
| 5201941 | Process for introducing additive substances which are capable of flow into a metallurgical vessel and a vessel for that process For the metallurgical treatment of a molten metal bath (1) in a metallurgical smelting and refining vessel (3), additive substances (43) which are capable of flow, in particular lime, are supplied in a granular to dust state, at least during a part of the... | 04/13/1993 |
| 5154756 | Method and apparatus for preliminary treatment of molten hot metal A method for the preliminary treatment of molten hot metal for steel making comprising passing molten hot metal towards the downstream side in a horizontally disposed trough-like vessel and injecting obliquely downwards a powdered refining agent into the ... | 10/13/1992 |
| 5085691 | Method of producing general-purpose steel The invention contemplates smelting in a steelmaking unit a carbon-containing semiproduct, tapping it into a ladle, supplying to the ladle slag-forming materials, a reducer and thermally pretreated oxide materials containing alloying elements. The supply ... | 02/04/1992 |
| 5078964 | Method of alloying feed material into molten metal A known "spark cup process" may be operated without the spark cup if the violent fluctuations in the melt surface with which the electric arc is struck are accommodated so as to allow the electric arc to be maintained substantially continuously. Controlli... | 01/07/1992 |
| 5007958 | Lime-based injection powder for steel-refining A lime-based injection powder for use in steel-refining, having excellent waterproofing and desulphurization effects, consists of (a) more than 65% by weight of calcium oxide, (b) less than 30% by weight of fluorite, and 5-10% by weight of Al powder, 5%-7... | 04/16/1991 |
| 4995907 | Method of deoxiding and alloying steel To produce deoxidized steel by the addition of deoxidizing agents to molten crude steel having an oxygen content of at least 200 ppm and the subsequent addition of alloying agents, the deoxidation is realized at least partially under the formation of liqu... | 02/26/1991 |
| 4906292 | Composite article having a tubular sheath containing a compacted material, for the treatment of liquid metals, and process for the production of said article The invention concerns a composite article with a tubular metal sheath containing a compacted powdery or granular material. The article is of substantially circular cross section (153). Its sheath comprises at least one closed fold (154), the fold edge (156) o... | 03/06/1990 |
| 4793855 | Process for the gasification of sewage sludge A process for the gasification of sewage sludge or other carbon-containing waste materials in a gasifier (1) is described. A solid fuel and oxygen-containing gas are also fed into said gasifier. The residues formed during gasification collect at the botto... | 12/27/1988 |
| 4738719 | Steel making flux Phosphorus furnace slag is used as a ladle flux and/or as a tundish flux in the continuous casting of steel. The phosphorus furnace slag uniquely combines the properties of thermal insulation, oxidation protection and inclusion absorption necessary to fun... | 04/19/1988 |
| 4666511 | Process for producing killed steel having a low nitrogen content The process for producing killed steel having a low content of nitrogen comprises pouring an effervescent steel from a converter into a ladle in which there are added to the molten steel contained in the ladle, in the course of the pouring operation, addi... | 05/19/1987 |
| 4652306 | Method of refining molten steel by arc process Molten steel is tapped from a converter into a refining ladle, and an ore such as Nb2 O3 ore is charged into the molten steel. Then, the interior of the refining ladle is held in an inert gas atmosphere. A reducing agent such as an A... | 03/24/1987 |
| 4630801 | Apparatus for adding solid alloying ingredients to molten metal stream An elongated, vertical conduit has an upper end, communicating with the bottom opening in an upper container or ladle, and an open lower end disposed above the top surface of a bath of molten metal in a lower container or tundish. A descending stream of m... | 12/23/1986 |
| 4619696 | Additive for metallurgical liquids, and method and device for the preparation thereof An additive for metallurgical liquids is disclosed which consists of an alloy formed by admission of one or more gas phase solutes into one or more liquid phase solvents. The solvent is a substance with semiconductor characteristics, and is selected from ... | 10/28/1986 |
