| Patent application number | Description | Published |
|---|
| 20090031860 | Production of Stainless Steel of AISI 4XX Grade Ferritic Steel in an Aod Converter - For the production of stainless steel of the ferritic AISI 4xx group of steels, particularly the AISI 430 group of steels, based on liquid pig iron and FeCr solids, the invention proposes the use of the AOD (Argon Oxygen Decarburization) process in which oxygen and inert gas (inactive gas) together are blown into the bath through nozzles and top-blown onto the surface of the bath by a blowing lance. The aim of the treatment is to conclude a smelting charge within an optimal time period, to achieve the intended tapping temperature and composition, and to minimize chromium losses. This is achieved by a correspondingly applied technology and by means of a metallurgic process model which observes, prognosticates and controls the treatment of the smelting charge. | 02-05-2009 |
| 20090255375 | Method for the Production of a Foamed Slag in a Metal Bath - The invention relates to a method for producing a foamed slag ( | 10-15-2009 |
| 20100011909 | METHOD AND DEVICE FOR PRODUCING PIG-IRON BASED STAINLESS STEEL WITHOUT USING A SUPPLY OF ELECTRICAL ENERGY - The aim of the invention is to produce stainless steel for all stainless steel products both in the austenitic and the ferritic range, based on liquid pig-iron and FeCr solids, without using a supply of electrical energy. According to the invention, the liquid pig-iron, after being pre-treated in a blast furnace ( | 01-21-2010 |
| 20100024600 | METHOD AND DEVICE FOR PRODUCING STAINLESS STEEL WITHOUT USING A SUPPLY OF ELECTRICAL ENERGY, BASED ON PIG-IRON THAT HAS BEEN PRE-TREATED IN A DDD INSTALLATION - The aim of the invention is to produce stainless steel for all stainless steel products both in the austenitic and the ferritic range, based on liquid pig-iron and FeCr solids, without using a supply of electrical energy. According to the invention, the liquid pig-iron, after being pre-treated in a blast furnace ( | 02-04-2010 |
| 20100089202 | METHOD FOR THE REDUCTION OF A SLAG HAVING A HIGH DEGREE OF CHROMIUM IN AN ELECTRIC ARC FURNACE - During the production of stainless steel, a slag is formed during the melting of the solid material in the electric arc furnace, the slag having a high degree of metal oxides, particularly chromium oxide. The chromium concentration often reaches values of more than 30%. Currently, such slags cannot be reduced to a desired degree due to their composition. In order to minimize the resulting high loss of recyclable material, the invention provides to charge the electric arc furnace with pellets, or briquettes ( | 04-15-2010 |
| 20100192672 | Indirect Determination of the Waste Gas Rate for Metallurgical Process - A method for the indirect determination of the waste gas rate in metallurgical processes. A reference gas such as helium is first added to the waste gas, specifically at a time which, with respect to flow, sufficiently precedes the taking of a sample such that a thorough mixing of the reference gas and waste gas is carried out, i.e., a virtually homogeneous distribution is achieved, and a quantitative helium analysis and nitrogen analysis of the waste gas, measured by a mass spectrometer, is carried out while taking into account the added amount of helium. | 08-05-2010 |
