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| Number | Title | Issue Date |
| 7993428 | Method for manufacturing molten iron A method for manufacturing molten iron comprises charging a carbonaceous material, a flux, and solid reduced iron obtained by thermally reducing carbon composite iron oxide agglomerates into an arc melting furnace and melting the solid reduced iron using arc heating... | 08/09/2011 |
| 7220494 | Metal dusting resistant product A product resistant or immune to carburization, metal dusting, coking, oxidation, and having sufficient mechanical strength for use at temperatures greater than 400° C. The product consists of a load-bearing member and a corrosion resistant member, wherein the corr... | 05/22/2007 |
| 6790254 | Method for controlling and adjusting the concentration of a gas component in a melt and a device for carrying out the same The invention relates to a method for producing a metal alloy, in which in a vessel at overpressure a certain desired content of an alloying constituent, which is gaseous in its normal state, is fed to said metal alloy. The method is designed such that precise addit... | 09/14/2004 |
| 6565773 | Conductive paste There is provided conductive paste wherein conductive fillers composed of copper micro-fibers are mixed into thermoplastic resin or thermosetting resin.... | 05/20/2003 |
| 6500224 | Method for operating a steelmaking furnace during a steelmaking process The invention is directed to a method for operating a steelmaking furnace including the steps of charging steelmaking materials into the steelmaking furnace, blowing oxygen into the steelmaking furnace, discontinuing the oxygen blow when the charged steel... | 12/31/2002 |
| 6206948 | Metal reduction and melting process and apparatus A metal reduction and melting process which involves the heating of a burden comprising a metal containing component and a carbon containing component in a channel type induction furnace in order to reduce such metal containing component, in which at leas... | 03/27/2001 |
| 5972065 | Purification of tantalum by plasma arc melting Purification of tantalum by plasma arc melting. The level of oxygen and carbon impurities in tantalum was reduced by plasma arc melting the tantalum using a flowing plasma gas generated from a gas mixture of helium and hydrogen. The flowing plasma gases o... | 10/26/1999 |
| 5968223 | Method for heating molten metal using heated baffle A method of heating a body of molten metal passing through a treatment bay. The method comprises providing a body of molten metal in a treatment bay and providing a baffle heater in the treatment bay to contact the molten metal. The baffle heater is compr... | 10/19/1999 |
| 5961689 | Method of protective atmosphere heating A method for heating and/or melting a charge such as aluminum in a furnace using heat generated by combustion to radiatively heat the charge through a layer of protective gas wherein combustion reaction products generated by the combustion are exhausted f... | 10/05/1999 |
| 5575829 | Direct use of sulfur-bearing nickel concentrate in making Ni alloyed stainless steel A process for obtaining Ni units from sulfur-bearing nickel concentrate during refining a nickel-alloyed steel or a stainless steel. Sulfur of the concentrate is transferred to and held within the slag by controlling slag composition and temperature, degr... | 11/19/1996 |
| 5562753 | Method and installation for producing molten steel from ferrous materials rich in carbonaceous materials Both a method and apparatus for producing molten steel are provided wherein ferrous materials rich in carbonaceous materials are fused in a first vessel of a single electric furnace having separate first and second vessels. The carbonized molten metal thu... | 10/08/1996 |
| 5346563 | Method for removing sulfur from superalloy articles to improve their oxidation resistance Superalloy articles are made more oxidation resistant by a process which includes heat treating the article in the presence of foreign chemical species, at a temperature at which the foreign chemical species reacts with and modifies any oxide film present... | 09/13/1994 |
| 5160533 | Method for grain refining of metals A method for grain refining of light metals is based on formation in situ of a grain refining agent. By means of an electric arc provided over the surface of a melted pool of the metal, a supplied gas, e.g. nitrogen, reacts with the metal to form the agen... | 11/03/1992 |
| 4946647 | Process for the manufacture of aluminum-graphite composite for automobile and engineering applications A process is disclosed for the manufacture of aluminium-graphite particulate composite using uncoated graphite particles for automobile and engineering applications. In the process the aluminium-alloy melt is treated with a reactive metal to increase the ... | 08/07/1990 |
| 4842642 | Additive for promoting slag formation in steel refining ladle In ladle refining of steel a molten protective slag covering is used consisting of iron blast furnace slag, or of a mixture of solid burnt lime and/or burnt dolomitic lime together with iron blast furnace slag in an amount effective to serve as a flux pro... | 06/27/1989 |
| 4806156 | Process for the production of a bath of molten metal or alloys Liquid argon, nitrogen or carbon dioxide is poured onto the surface of a bath of molten metal in a furnace. According to the invention, liquefied gas is discharged onto the surface in an amount which ranges from about 0.025 to 0.060 lb/cu. in. of metal in ... | 02/21/1989 |
| 4699654 | Melting furnace and method for melting metal A melting furnace and method for melting metal comprising the injection of inert gas into molten metal at a defined location as a concentrated plume to create localized surface agitation, and high quality refractory surrounding the gas injection means at ... | 10/13/1987 |
| 4655826 | Method for post-melting treatment of molten steel Molten steel is refined by a method that includes the steps of isolation from contact with the ambient and atmosphere, motion of the molten steel so that portions of the molten steel remote from the surface up to the surface, and addition of heat to the p... | 04/07/1987 |
| 4650517 | Method of heating molten steel by arc process Three electrodes are dipped into slag on molten steel in a ladle. The electrodes are connected to a three-phase AC voltage. An arc is formed between each electrode and molten steel upon energizing the electrodes. The molten steel is heated by arc heat. Ea... | 03/17/1987 |
| 4600427 | Method of ladle steelmaking and product produced thereby A method of refining steel in the ladle using a low melting point slag is disclosed. Both ELS and resulfurized steels are subjected to the simultaneous effect of a vacuum and a purging agent, preferably an inert gas, to lower the H2 content int... | 07/15/1986 |
| 4560405 | Process for desulfurizing molten steel A process for desulfurizing molten steel comprising the steps of: removing converter slag from molten steel; adding a desulfurizing flux onto the molten steel from which the converter slag has been removed; supplying power to electrodes at a predetermined... | 12/24/1985 |
| 4552587 | Method of operating ladle refining furnace The invention relates to a method of operating a ladle refining furnace for blowing Ar gas through bubbling lances submerged in molten steel in a ladle to stir the molten steel. The flow rate and the rate of change in the flow rate of the Ar gas blown thr... | 11/12/1985 |
| 4551174 | Method of refining molten steel by arc process Nondeoxidized molten steel is removed from a steel converter and poured into a ladle. Carbon electrodes are submerged in a slag layer on the molten steel and are separated by a predetermined distance from the molten steel. The electrodes are energized to ... | 11/05/1985 |
| 4551173 | Method for adjusting composition of molten steel in arc process Molten steel is refined in a converter and is poured from the converter to a ladle. A ferro-alloy containing a component to be adjusted is added to the molten steel as needed. An amount of the alloy to be added to the molten steel in the ladle is calculat... | 11/05/1985 |
| 4517015 | Steel refining method A steel refining method of the type in which the steel is refined through an interfacial reaction between the molten steel in a vessel and a slag on the molten steel. The method simultaneously employs both of blowing of an inert gas into the molten steel ... | 05/14/1985 |
| 4431443 | Methods of vacuum arc melting A method is provided for substantially eliminating metal condensates on the walls of a vacuum arc melting vessel above a molten metal pool by the step of providing an atmosphere of non-condensible gas in the vessel above the molten metal pool during the m... | 02/14/1984 |
| 4362556 | Arc furnace steelmaking involving oxygen blowing In arc furnace steelmaking, oxygen gas is blown in the molten steel at melting period and/or oxidizing period so as to decrease the carbon content therein to 0.20% or less, preferably 0.15% or less, and subsequently, carbonaceous material is blown in the ... | 12/07/1982 |
| 4238227 | Cleansing of steel by gas rinsing A method for deoxidizing steel to effect exceptional cleanliness wherein a relatively high amount of aluminum is added to the tap ladle before the first one-third volume of steel is tapped, and then adding conventional deoxidizers while the final two-thir... | 12/09/1980 |
| 4236913 | Gaseous atmosphere for electric arc furnaces An inert atmosphere for electric arc furnaces is either carbon dioxide, argon, a mixture of carbon dioxide and argon or a mixture of nitrogen and carbon dioxide. The inert gas atmosphere is utilized in the manufacture of high alloy or stainless steels, as... | 12/02/1980 |
| 4224056 | Direct reduction process for iron ores with fluidized bed system In a reactor, fine iron ore solids are made to descend through the fluidized bed of fine carbon bearing particles sustained within the reactor so that the fine iron ore solids may be reduced and simultaneously the reducing gas may be produced. The direct ... | 09/23/1980 |
| 4222768 | Method for producing electric steel In a method for producing carbon steel or alloy steel by an electric steel-making procedure comprising the steps of charging a steel scrap into an electric furnace, melting the scrap, refining the melt and separating the molten steel from the slag, the im... | 09/16/1980 |
| 4200452 | Method for the refining of iron-based melts A method of and an apparatus for the refining of a ferrous melt makes use of a ladle with a removable cover provided with a porous plug at its bottom through which an inert gas is introduced. A direct current source is connected to a carbon electrode in c... | 04/29/1980 |
| 4191559 | Skim removal A method of removing skim from molten metal comprises providing a body of molten metal and passing a fluxing gas therethrough to carry skim to the surface of the metal. The skim on the surface is treated to substantially reduce the amount of molten metal ... | 03/04/1980 |
| 4168156 | Method of and electric furnace for processing nonferrous molten slags A method comprising the steps of supplying a carbonaceous reducer in a layer onto the surface of molten slag and feeding an oxygen-free gas into said slag in an amount and at a rate ensuring recirculation of said slag with its outflow onto the surface of ... | 09/18/1979 |
| 4097269 | Process of desulfurizing liquid melts A method for the rapid desulfurization of steel melts having oxygen available for reaction of less than 0.01% wherein the temperature of the melt is raised above 1500° C, and a desulfurizing slag is injected into the melt using a non-oxidizing carrier ga... | 06/27/1978 |
| 4088475 | Addition of reactive elements in powder wire form to copper base alloys A method for adding reactive elements to molten copper or copper base alloys is disclosed. This method prevents unwanted reactions and oxidation by adding the reactive elements to the molten metal in the form of a powder mixture placed within tubing which... | 05/09/1978 |
| 4082544 | Electric induction heating of materials of low electrical conductivity Materials of low electrical conductivity, such as minerals and metal compounds, are floated on a metal melt which is itself heated by a channel-type electric inductor, the heat from the melt transferring to the material. A pneumatic blast is injected into... | 04/04/1978 |
| 4014685 | Manufacture of steel The invention is concerned with the desulphurizing of molten steel by the use of a lime-based flux. In addition to lime the flux includes sodium carbonate, an alkali metal or alkaline earth metal fluoride, typically fluorspar, alumina and a metallic reduc... | 03/29/1977 |
| 3992195 | Process for the production of steel with increased ductility A process for the production of steel with increased ductility in which a sulfur-containing steel melt is deoxidized and, if desired, is supplied with alloying elements, the deoxidized melt is treated with calcium as part of a purification action simultan... | 11/16/1976 |
| 3964898 | Process for batch production of sponge iron Sponge iron is produced by a process including a charging step during which an iron oxide is arranged as a stationary bed in a furnace chamber, a heating step during which a hot, preferably non-reducing atmosphere is cased to flow through the stationary b... | 06/22/1976 |
