Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7425230 | Method and device for producing pig iron and/or pig iron intermediate products Apparatus and process for producing metal products, in which a metal-containing charge material is melted in a melting unit, and a working gas, in particular an at least partially reducing working gas, is additionally produced in the melting unit. The working gas pr... | 09/16/2008 |
| 7182279 | Atomizer for atomizing molten metal An atomizer includes a T-shaped chamber with tapered insides and an outlet which is in communication with the chamber. A first path is located in a center area in the chamber so as to introduce molten metal therein and two second paths are introduced into the chambe... | 02/27/2007 |
| 6793710 | Method for blowing oxygen in converter and top-blown lance for blowing oxygen A method for blowing oxygen in a converter uses a top-blown lance having a Laval nozzle installed on its tip. The Laval nozzle has a back pressure of the nozzle Po(kPa) satisfying a formula, Po=FhS/(0.00465·Dt2), with respect to a oxygen-flow-... | 09/21/2004 |
| 6514310 | Process for injection of a gas with the aid of a nozzle The electric arc furnace is equipped with a supersonic injector comprising a so-called Laval nozzle arranged at a certain distance above the bath. The dimensions of the nozzle are calculated as a function of the desired flow rate of oxygen and the desired... | 02/04/2003 |
| 6432163 | Metal refining method using differing refining oxygen sequence A metal refining method particularly useful with a basic oxygen steelmaking process, wherein during an initial period, refining oxygen is provided into the furnace headspace surrounded by a shroud comprising oxygen and inert gas, and during a subsequent p... | 08/13/2002 |
| 6409790 | Method and apparatus for practicing carbonaceous-based metallurgy An energy efficient, coal-based method and apparatus that are environmentally friendly which produce under pressure metallized/carbon product and molten metal directly from abundant coal or other carbonaceous material, and low cost fines (or ore concentra... | 06/25/2002 |
| 6214085 | Method for direct steelmaking This invention relates to making steel directly from ore concentrate and non-coking coal to which flux material is added. The method eliminates numerous steps by reducing the ore with the coal in a sealed chamber and under pressure termed "carbotreating" ... | 04/10/2001 |
| 6017380 | Top-blown refining method in converter featuring excellent decarburization and top-blown lance for converter A refining method for decarburization by blowing by using a top-blown lance having a gas-supplying pipe of at least one independent line, wherein the absolute secondary pressure P0 of nozzle of the lance of at least one line is maintained to be... | 01/25/2000 |
| 5885323 | Foamy slag process using multi-circuit lance A method of improving post-combustion heat recovery in a vessel containing a charge of molten ferrous metal and slag includes the use of a lance for the introduction of oxygen gas into the charge. The method includes blowing oxygen into the charge through... | 03/23/1999 |
| 5769923 | Decarburization refining process for chromium-containing molten metal and associated top blowing lance Method and top blowing lance for decarburization refining chromium molten ferrous metal in which dust formation and chromium loss due to oxidation are suppressed and high productivity is achieved. Decarburization of molten ferrous metal is achieved by blo... | 06/23/1998 |
| 5584909 | Controlled foamy slag process A method of improving the post-combustion heat recovery in a basic oxygen furnace by controllably forming a foamy slag. The foamy slag is generated by increasing the lance height and reducing the rate of lance height reduction during the oxygen blowing cy... | 12/17/1996 |
| 5088696 | Multi-tube blowing lance A lance intended for injecting oxygen and/or an inert gas into liquid steel comprises a metal supply tube which opens into a distributor from which issue a plurality of injection tubes arranged parallel and concentrically with respect to the longitudinal ... | 02/18/1992 |
| 5051127 | Process for post combustion Process and apparatus for post combustion of reaction gases generated in a molten iron bath above the bath by means of at least one jet of oxidizing gases, whereby energy thereby produced is transferred to the bath and whereby the or each jet of oxidizing... | 09/24/1991 |
| 4752330 | Method for melting and refining metals This invention relates to a lance/burner apparatus and a method for melting and refining metals. Combustion produced from an oxy-fuel or fuel-air-oxygen flame is used to preheat and melt scrap. Oxygen is introduced through a lance pipe into the molten scr... | 06/21/1988 |
| 4675049 | Process for producing high quality steel A process for producing high quality steel includes a first step of decarburizing the melt in a converter by top blowing with oxygen to a carbon content of less than 0.1% carbon. Next, carbon (comminuted coal) is delivered to the melt at a high velocity w... | 06/23/1987 |
| 4643403 | Liquid-cooled lance for blowing oxygen onto a steel bath and method of operating the lance A liquid-cooled lance for blowing oxygen onto a bath of molten steel, has a tip (1) with at least one outlet from which a primary supply of oxygen is blown onto the bath, a central duct (2) for the supply of the primary oxygen surrounded by a double tube ... | 02/17/1987 |
| 4531973 | Metallurgical processes The invention relates to various energy saving measures for use in the smelting, refining and melting of metals, and in particular in the manufacture of steels, alloy steels and ferrous alloys. In such processes fuel consumption is reduced and efficiency ... | 07/30/1985 |
| 4455166 | Nozzle for an oxygen injection lance for decarburization of pig iron and use for the decarburization of chromium containing pig iron A nozzle is disclosed for use in the decarburization of molten pig iron by means of a jet of oxygen from a lance provided with such nozzle. The nozzle according to the invention is characterized by a divergent portion which, beyond the neck, has a frustoc... | 06/19/1984 |
| 4324584 | Process for the decarburization of chromium-containing pig iron A process is disclosed for the decarburization of a molten bath of chromium-containing pig iron which, in a single operation, permits decarburization by means of an oxygen jet and thus permits chromium or nickel chromium steels to be obtained directly, th... | 04/13/1982 |
| 4294432 | Method and apparatus for cooling BOF hood paneling A method and apparatus for making steel in a basic oxygen furnace installation, in which water is sprayed from a central location within and at the open end of an exhaust hood 12 outwardly toward the inside hood surface to cool the hood and wet the off-ga... | 10/13/1981 |
| 4270949 | Making of steel by the BOF process The usual oxygen lance, and a coating lance, are disposed in upright and spaced-side-by-side relation for selective lowering into the BOF vessel when the latter is in the normal upright position it occupies for refinement of its metallic charge. Preferabl... | 06/02/1981 |
| 4207094 | Method for preheating the oxygen in an oxygen steel making process A method for preheating the oxygen used in converters. Steam which is already available in the usual steel manufacturing plant, is used to preheat the oxygen. The steam may be generated from waste gas produced in an converter process. A heat exchanger whi... | 06/10/1980 |
| 4163663 | Refining process based on top-blowing with oxygen A process for refining iron melts by blowing oxygen onto the surface of the iron melt, the quantity or concentration of the stream of oxygen being kept constant for most of the blowing time and being reduced in one or more stages towards the end of the bl... | 08/07/1979 |
| 4150973 | Method of controlling molten steel temperature and carbon content in oxygen converter A method of controlling the temperature of molten steel and the carbon content in an oxygen converter comprising the steps of, making measurements by the use of a detecting probe at the suitable time in the midst of the blowing; measuring the actual value... | 04/24/1979 |
| 4130419 | Process for the purification, modification and heating of a cast-iron melt A process for the treatment of a cast-iron melt with oxygen, e.g. for raising the temperature thereof or otherwise modifying the composition of the melt in which the oxygen is introduced directly into the liquid cast iron at a rate (quantity per unit time... | 12/19/1978 |
| 4089678 | Method and product for protecting molten magnesium An improved process and product for supplying a protective atmosphere of carbon dioxide plus a minor percentage of sulfur hexafluoride (CO2 /SF6) by means of a solid agent consisting of solidified CO2 and SF6 wh... | 05/16/1978 |
| 4065298 | Steel making process by oxygen top-blown converter In a steel making process with an oxygen top-blown converter when a certain inclining angle (θ) is given within a range of 0 | 12/27/1977 |
| 4043799 | Method and device for blowing oxygen in metal refining converters in unstationary manner The invention provides variation in the delivery of oxygen to converters for refining metal. Thus, oxygen blowing into such converters in unstationary manners, i.e., varying degrees of pressure and/or flow rate, is performed by means of partialization of ... | 08/23/1977 |
| 4040819 | Basic oxygen steel furnace and process An improved method for the production of steel which results in reducing the volume of off-flow gases which are created in the production of steel by the Basic Oxygen Steel Process. The method involves introduction of oxygen within the flame cone of the o... | 08/09/1977 |
| 4039321 | Method for producing a grain-oriented electrical steel by an oxygen-blown convertor A method for producing steel for grain-oriented electrical steel sheet or strip in an oxygen-blown convertor, which comprises preliminarily adjusting the manganese content of molten pig iron to be charged into the convertor to not more than 0.35%, and blo... | 08/02/1977 |
| 3986865 | Process for producing steel A charge consisting of scrap, sponge iron, pellets and the like is admitted into a vertically arranged melting chamber so as to form a column therein. A burner lance generates a flame which melts the column from below so as to produce a melt and an FeO sl... | 10/19/1976 |
| 3955968 | Method for determining the temperature of a molten metal bath In a top blown oxygen converter, temperature of the molten metal is determined by measuring the total heat of the charge. The oxygen supplied through the lance is measured and the amount of carbon monoxide and carbon dioxide leaving the converter are cont... | 05/11/1976 |
