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| Number | Title | Issue Date |
| 7211125 | Alloyed steel powder with improved degree of sintering for metal injection molding and sintered body An alloyed steel powder for metal injection molding that eliminates the problems of decreased product strength and difficulty of temperature control which exist in conventional alloys for sintering and that improves productivity of the sintering furnace is provided,... | 05/01/2007 |
| 7163569 | Raw or granulated powder for sintering, and their sintered compacts An object of the present invention is to provide a low-alloyed steel powder for sintering that can yield a sintered compact with high density and uniform characteristics, and to provide a sintered compact having such characteristics. The present invention is a raw p... | 01/16/2007 |
| 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 |
| 6733565 | Additive for production of irons and steels A technique for producing compacted graphite iron utilizes agglomerations, such as briquettes or tablets that include a sulfur-containing material such as iron sulfide. The agglomerations are free of chemical binders and utilize iron and aluminum metal powders and p... | 05/11/2004 |
| 6428598 | Additive composition for use in special steel making An additive composition for use in steel making, which comprises 84.8-99.3% by weight of an oxide component; 0.5-1.6% by weight of a metal component; and 0.04-0.07% by weight of a rare-earth element component is used in such a way that its four aliquots a... | 08/06/2002 |
| 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 |
| 6355089 | Process for the manufacture of carbon or low-alloy steel with improved machinability A carbon or low-alloy steel is provided with improved machinability. The carbon content of the steel is less than 1.5% and the sum of the alloy elements contained therein is less than 9%. The steel contains oxide and sulfide inclusions, and the chemical c... | 03/12/2002 |
| 6293988 | Inoculant and inoculant method for gray and ductile cast irons A new technique for producing ferrosilicon free inoculating agents for gray and ductile irons utilizing oxy-sulfide forming elements combined with sulfur and oxygen and 1) mechanically pressed into an insert or tablet for placement into foundry sand molds... | 09/25/2001 |
| 6280497 | Cored wire for treating molten metal and method of manufacture A cored wire continuously formed by continuously inserting an extruded core inside a continuously roll formed sheath, the peripheral edges of the roll formed sheath joined by a continuous lock seam. Inspection of the partially formed lock seam at a design... | 08/28/2001 |
| 6197088 | Producing liquid iron having a low sulfur content A method of liquid iron production using high sulfur fuels is provided in which the level of sulfur in the iron is maintained below 0.1%. The low sulfur content is achieved even in the presence of high sulfur concentrations in the reducing gases and witho... | 03/06/2001 |
| 5782957 | Process for treating iron bearing material A process for treating iron-bearing material with a carbonaceous material to form a dry mixture, wherein the amount of carbonaceous material added exceeds the stoichiometric amount required to reduce the metal oxide to elemental metal. In one embodiment, ... | 07/21/1998 |
| 5609199 | Method of manufacturing steel containing Ca A method of manufacturing steel having Ca including the steps of adding Ca metal or alloy containing Ca to molten steel in a ladle that has been killed by adding a reducing agent, such as Al, to the molten steel in a predetermined quantity when or after t... | 03/11/1997 |
| 5125963 | Metallurgical controlling method The present invention relates to a method for monitoring and control of smeltmetallurgical processes, endothermic as well as exothermic ones, preferably pyrometallurgical processes, by means of optical spectrometry, whereby one first determines for each e... | 06/30/1992 |
| 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 |
| 4999053 | Method of producing an iron-, cobalt- and nickel-base alloy having low contents of sulphur, oxygen and nitrogen A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of: (a) holding a molten alloy ... | 03/12/1991 |
| 4978499 | Soft steel for machine cutting and method of producing it A soft steel for machine cutting with high machinability performances having a content of Cࣘ0.25%, a content of Mn of 0.8 to 1.5%, a content of P of ࣘ0.1%, a content of S of 0.15 to 0.40%, and a content of Si of 0.05 to 0.40%, expressed in percentages... | 12/18/1990 |
| 4957547 | Process for continuously melting of steel A process for continuously melting steel from largely already reduced iron containing material such as pig iron and/or scrap iron, in which process the melt is poured into a ladle for performing subsequent metallurgical steps. The metallurgical slag is, b... | 09/18/1990 |
| 4943411 | Process for treating molten iron with magnesium additions A process for treating molten cast iron with pure magnesium wherein a granular mixture of magnesium granules admixed with granules of refractory material is flooded with molten iron. By employing granular refractory material of controlled size in the gran... | 07/24/1990 |
| 4830090 | Method of continuously casting lead-bearing steel A method of continuously casting lead-bearing steel by adding lead to steel melt in a tundish. The tundish is divided into a plurality of chambers including a melt receiving chamber and an immersed nozzle chamber, lead is supplied to the molten steel in a... | 05/16/1989 |
| 4806157 | Process for producing compacted graphite iron castings A process for producing compacted graphite cast iron thin walled shaped castings in a high productivity line is provided which comprises: (i) forming a near eutectic melt of cast iron, having a low sulfur content, preferably around 0.01% by weight; (ii) a... | 02/21/1989 |
| 4729787 | Method of producing an iron; cobalt and nickel base alloy having low contents of sulphur, oxygen and nitrogen A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of: (a) holding a molten alloy ... | 03/08/1988 |
| 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 |
| 4666515 | Method for adding bismuth to steel in a ladle Bismuth is added to molten steel in a ladle, and the molten steel is covered with a slag layer sufficiently thick to prevent a decrease in the bismuth content during the time the molten steel is in the ladle.... | 05/19/1987 |
| 4652308 | Process for refining molten steel The invention provides a process for obtaining low-nitrogen steel by tapping molten steel from a converter without deoxidizing and by then deoxidizing the molten steel in a ladle refining furnace from which slag has been removed, and a process for obtaini... | 03/24/1987 |
| 4636249 | Treatment of molten metal The invention is directed to a method of and apparatus for, introducing into a bath of molten metal (e.g. ferrous metal) contained in a vessel an alloying component (e.g. lead) or a reagent. The method includes the steps of connecting a plurality of plugs... | 01/13/1987 |
| 4570692 | Methods of pouring metal A method of pouring metal to provide improved physical properties is provided including the steps of: (a) pouring the metal through a generally vertical consumable tube extending from a pouring source to a point submerged beneath the surface of a molten p... | 02/18/1986 |
| 4544407 | Process for producing cast iron castings with a vermicular graphite structure Cast iron with a vermicular graphite structure is produced by a process which involves the steps of determining the ratio of magnesium to sulphur in the melt and then adjusting the value of such ratio to between about 0.8 and 2.5.... | 10/01/1985 |
| 4529441 | Electrical steels The invention provides a continuous cast electrical steel and its method of production from a steel melt having a composition range of up to 0.06% carbon, up to 0.04% sulphur, up to 0.15% phosphorus, up to 1.0% manganese, and not more than 0.001% silicon,... | 07/16/1985 |
| 4486227 | Manufacture of a composite tubular product For the purpose of introducing an additive into a molten metal bath, a reactive powder is enclosed in a tubular sleeve composed of a metal compatible with the bath. The cross-section of the sleeve is reduced after filling to compact the powder while leavi... | 12/04/1984 |
| 4472196 | Exothermic alloy for addition of alloying ingredients to steel An addition agent and method are provided for adding alloying ingredients to a molten steel bath comprising a P/M compact formed of a compacted mixture of a particulate primary addition alloy and at least one secondary particulate metal. The primary parti... | 09/18/1984 |
| 4440568 | Boron alloying additive for continuously casting boron steel A boron alloying additive for continuous casting of boron steel having the desired hardenability without tundish nozzle blockage. The additive comprises 0.25-3.0% boron, 2.5-40% rare earth metals (RE), 6-60% titanium, and the balance iron. The additive ma... | 04/03/1984 |
| 4401469 | Manufacturing cast iron with pre-reduced iron ore pellets Cast iron having more regular and uniform free graphite particle shape and distribution is more reliably produced by using pre-reduced iron pellets as a major component of the melting stock. Cast iron made in this way may be advantageously used to form in... | 08/30/1983 |
| 4396425 | Addition agent for adding vanadium to iron base alloys Addition of vanadium to molten iron-base alloys using an agglomerated mixture of V2 O3 and calcium-bearing reducing agent.... | 08/02/1983 |
| 4373948 | Addition agents for iron-base alloys Addition of a metal selected from niobium, molybdenum, chromium and tungsten to molten iron-base alloys using an agglomerated mixture of a selected metal oxide and calcium-bearing reducing agent.... | 02/15/1983 |
| 4363661 | Method for increasing mechanical properties in ductile iron by alloy additions A method is disclosed of making as-cast ductile iron wherein an iron melt having a chemistry capable of forming gray iron having flake graphite is treated with a nodularizing agent and solidified to provide a microstructure consisting substantially of a p... | 12/14/1982 |
| 4362559 | Method of introducing addition agents into a metallurgical operation Addition agents are blended with a modified tall oil pitch binder and briquetted, extruded, molded, pelletized, or tabletized into a unitary composition. This compacted composition is then fed into a metallurgical operation, such as steel-making, at an ap... | 12/07/1982 |
| 4361442 | Vanadium addition agent for iron-base alloys Addition of vanadium to molten iron-base alloys using an agglomerated mixture of V2 O5 and calcium-bearing reducing agent.... | 11/30/1982 |
| 4342590 | Exothermic steel ladle desulfurizer and method for its use An exothermic, reducing and basic ladle desulfurizing mix, and method for its use, which minimizes the temperature drop encounterd by the molten steel tapped from the furnace. The mix is comprised essentially of finely-divided particulate iron and/or mang... | 08/03/1982 |
| 4317678 | Process for continuous casting of aluminum-deoxidized steel Calcium or a calcium-bearing material is added to an aluminum-deoxidized steel in an amount which is sufficient to establish a calcium concentration exceeding the aluminum content by a value greater than about 0.14.... | 03/02/1982 |
| 4298377 | Vortex reactor and method for adding solids to molten metal therewith Method and apparatus for adding solids to molten metal by continuously feeding both the solids and the metal into a vortex forming chamber from which the mixture is discharged at the core of the vortex as a free-falling, hollow-centered stream.... | 11/03/1981 |
