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| Number | Title | Issue Date |
| 6375346 | Method for detecting the spalling of a layer of buildup of a refractory lining in a metallurgical furnace A method is provided for detecting the spalling off of a significant portion of buildup of alkali and/or metal from the refractory lining of a metallurgical furnace. The method includes monitoring the rate of change of temperature of the refractory lining... | 04/23/2002 |
| 6361624 | Fully-stabilized steel for porcelain enameling A method of producing a fully stabilized extra low carbon porcelain enameling steel having excellent formability and fish scaling resistance as well as superior enamel adherence. The method includes hot rolling a slab to strip, the slab having a compositi... | 03/26/2002 |
| 6331241 | Method of making chromium-plated steel Chromium electroplating of steel strip, to make tin-free steel, is conducted in an electrolytic bath containing predominantly HCrO4- ions rather than the conventional [HCr2 O7 ]- or Cr2 O | 12/18/2001 |
| 6246235 | Tubular products inspection An inspection station and process for pipe or other ferromagnetic articles utilizes a generally straight flux field amplifier made of a multi-stranded cable surrounded by non-conducting resin, for inducing transverse lines of magnetic force. The flux fiel... | 06/12/2001 |
| 6174426 | Tin-plated steel with adhesion promoter A method is provided for enhancing the adhesion of organic polymer coatings to electrolytically passivated (CDC) tin-plated steel strip. The method includes applying a solution comprising 0.1 to 7 percent of an adhesion promoter to the electrolytically ti... | 01/16/2001 |
| 6137294 | Prediction of bulk density of particulates with a correlation based on moisture content A method for predicting the bulk density of coal after it is dropped from a known height into a container from measurements of bulk density and moisture content of the coal before it is dropped into the container. The method includes obtaining a plurality... | 10/24/2000 |
| 6130637 | Measuring the thickness of hot slag in steelmaking Radar is used to measure not only the level of slag on molten steel but also its thickness; the measurement is used to calculate the volume of slag, and, in turn the amount of additives for slag treatment.... | 10/10/2000 |
| 6120577 | Treatment of steel mill waste metal oxides A process of recovering iron values and separating zinc oxides and other contaminants from steel mill waste metal oxides, such as blast furnace dust, BOF dust, mill scale and oily sludges, characterized by iron metallization levels up to 95% or more and z... | 09/19/2000 |
| 6110296 | Thin strip casting of carbon steels A substantially carbon free (e.g. 50-80 ppm carbon max.) iron base melt is strip cast to provide a cast strip having a low strength, high ductility, essentially ferrite matrix substantially free of hardening acicular ferrite, bainite and martensite phases... | 08/29/2000 |
| 6062777 | Machining threaded tubular goods A method is provided for machining threads on cylindrical parts, particularly oil country tubular goods, by mounting four thread-cutting chasers in a die head of a thread cutting machine. The thread chasers are each of unique profile, which enables the cu... | 05/16/2000 |
| 6056833 | Thermomechanically controlled processed high strength weathering steel with low yield/tensile ratio A high performance weathering steel having a minimum yield strength of 70-75 ksi and a yield/tensile ratio less than about 0.85 is produced from a steel composition consisting essentially, in weight percent, of about: carbon 0.08-0.12%; manganese 0.80-1.3... | 05/02/2000 |
| 6022467 | Electrolytic tin plating process with reduced sludge production Continuous electrolytic tin plating is accomplished in a bath containing 90-160 g/L sulfuric acid, 4-70 g/L tin ion and a grain refiner, and 1-4% nonylphenol ethoxylated with 8-10 ethylene oxide groups, having a weight average molecular weight of 616&#b1;... | 02/08/2000 |
| 6013163 | Probe for detection of the concentration of various elements in molten metal A system is provided for measuring the concentration of an element in molten metal such as silicon, chromium, manganese or aluminum. The system includes a probe with a sensor having a solid electrolyte, a reference electrode in contact with a first surfac... | 01/11/2000 |
| 6006575 | Reversible mandrel bar assembly The present invention is of a mandrel bar assembly for a seamless pipe mill. The assembly includes a pair of tooling sections each having a tapered end, a reduced diameter portion axially inward of the tapered end adapted to be gripped by a retaining mean... | 12/28/1999 |
| 5981917 | Ladle preheat indication system A ladle preheating system and method in which heat input rate to the ladle is calculated and monitored throughout the preheating period, calculating the moving average slope representing change over time of the rate of change of heat input, correcting the... | 11/09/1999 |
| 5975754 | Method for monitoring the wear and extending the life of blast furnace refractory lining A method is provided for extending the life of a refractory lining of a blast furnace hearth. The refractory hearth has temperature probes embedded in the floor and walls thereof. The method includes periodically measuring temperatures indicated by the pr... | 11/02/1999 |
| 5972072 | Desulfurizing mix A desulfurization composition contains from about 3% to about 20% particulate metallic aluminum, about 5% to about 30% particulate alumina, about 0.5% to about 12% particulate hydrocarbon material or other gas generating composition and the balance lime p... | 10/26/1999 |
| 5961214 | Determining protective layer thickness of blast furnaces A method is provided for determining the thickness of a protective layer of solidified metal skull formed on the refractory hearth of a blast furnace. The refractory hearth has temperature probes embedded in the floor and walls thereof. The method include... | 10/05/1999 |
| 5944421 | Method for determining the conditions of heat transfer in a blast furnace A method of determining the conditions of heat transfer at the interface of the refractory and a metal shell of the furnace by calculating the interface temperature from thermoprobes in the refractory and then from a thermoprobe in the metal shell and the... | 08/31/1999 |
| 5885325 | Process and apparatus for the manufacture of steel A two stage reaction for the production of steel from iron carbide is carried out in two separate but interrelated reactors. In the first reactor, iron, carbide, with slag formers, is fed into a feed end and the reaction is well-mixed by the vessel geomet... | 03/23/1999 |
| 5873924 | Desulfurizing mix and method for desulfurizing molten iron A desulfurization composition contains from about 3% to about 20% particulate metallic aluminum, about 5% to about 30% particulate alumina, about 0.5% to about 12% particulate hydrocarbon material or other gas generating composition and the balance lime p... | 02/23/1999 |
| 5817246 | Sliding gate A sliding gate valve comprising a chamber (22), a stationary mounted plate (2) and a sliding plate (1) that is movable in relation to said stationary plate, and sliding plate being supported within a slide frame (20) that is movable in relation to the cha... | 10/06/1998 |
| 5814202 | Electrolytic tin plating process with reduced sludge production Continuous electrolytic tin plating is accomplished in a bath containing 90-160 g/L sulfuric acid, 40-70 g/L tin ion and a grain refiner, at a speed of 900-1600 feet per minute and a current density as much as 1500 amperes per square foot or more.... | 09/29/1998 |
| 5795410 | Control of surface carbides in steel strip A method is provided for reducing the size and area coverage of surface carbides formed during the box annealing of steel strip. In one aspect the method includes providing a casting consisting essentially of, by weight percent, 0.08% max. carbon, 1.0% ma... | 08/18/1998 |
| 5782999 | Steel for enameling and method of making it An enameling steel having excellent strength after fire includes up to 0.008% C, 0.25-0.35% Mn, 0.03-0.05 Al, 0.010 to 0.014 N and 0.020-0.025 Nb.... | 07/21/1998 |
| 5772795 | High strength deep drawing steel developed by reaction with ammonia A method of producing high strength steel sheet and formed articles fabricated from the sheet and containing about 0.01-0.3 free and uncombined atomic percent Ti, Nb or V as strengthening element, by hot rolling or hot rolling plus cold rolling the sheet ... | 06/30/1998 |
| 5765806 | Method of dislodging a stuck drift gage A drift gauge sticker remover comprises a base, a frame mounted on the base and extending into the pass line of a powered drift gauge rod. The frame has a slot in which is mounted a pin supporting the top ends of a pivoted front plate and a back plate in ... | 06/16/1998 |
| 5681526 | Method and apparatus for post-combustion of gases during the refining of molten metal A post-combustion lance for use in refining molten metal and recovering heat by combustion of combustible gases evolved from the molten metal bath is provided with a plurality of pairs of post-combustion nozzles arranged about the periphery of the lance a... | 10/28/1997 |
| 5676195 | Method of and apparatus for limiting ingress of gas to incipient continuous cast slabs Ingress of gas such as air through the joint of a pour tube and tube holder of a continuous caster is prevented or inhibited by passing an inert gas into a circumferential channel around the orifice and at the interface of the joint; the gas is evenly dis... | 10/14/1997 |
| 5670075 | Sealing gas delivery system for sliding joints In the continuous casting of steel, gas is prevented or inhibited from contacting molten steel through the valve slide plate by feeding inert gas through channels in the slide plate and adjacent parts; the channels contain porous refractory inserts and ca... | 09/23/1997 |
| 5567482 | Method of protecting steel strip In a high-speed electrogalvanizing process, steel strip is protected from the formation of troublesome zinc nodules by masking the edges of the strip, while the strip is moving and upstream from the electrogalvanizing step, with an ultraviolet curable coa... | 10/22/1996 |
| 5556515 | Coke oven door A coke oven door, which includes a metal frame, means for latching the door in a closed position, a sealing member extending around the perimeter of the frame having forward edges adapted to contact a sealing surface on a coking chamber door jamb for effe... | 09/17/1996 |
| 5556457 | Recovery of steel plant revert materials through cementitious agglomeration A method of recovering steel plant waste revert materials including blast furnace flue dust and sludges involves mixing the revert materials with water to provide a total moisture content of about 14-20% by weight, then adding Portland cement as a sole bi... | 09/17/1996 |
| 5554207 | Process of recycling iron oxides and plastics in steelmaking A process for recovering iron values from waste iron oxide, especially iron oxide dust from steelmaking furnaces, wherein the iron oxide is mixed with a water-insoluble thermoplastic material and heated to melt the plastic to form a binder for the iron ox... | 09/10/1996 |
| 5536050 | Connection for fabricating mandrel bar from used segments In the fabricating of a mandrel bar, a plurality of used mandrel bar segments are provided, each of which has a central bore comprising a smooth surface portion and a threaded portion. Each segment has a circumferential recess at an end thereof and a beve... | 07/16/1996 |
| 5524867 | Drift gauge rod pushing device A drift gauge rod pushing device comprises a base, a frame mounted on the base and extending into the pass line of a powered drift gauge rod. The frame has a slot in which is mounted a pin supporting the top ends of a pivoted front plate and a back plate ... | 06/11/1996 |
| 5518154 | Gate and pour tube assembly for use in throttling gate valve Undesirable deposits of precipitated alloying materials are avoided in a sliding gate valve apparatus of the type in which gates are sequentially moved to and from operative position between the pour opening of a teeming vessel and a pour tube assembly fo... | 05/21/1996 |
| 5516373 | High performance steel strapping for elevated temperature service and method thereof Improved steel strapping and method for producing comprising adding to a steel composition of about 0.25 to about 0.34 wt. % carbon, about 1.20 to about 1.55 wt. % manganese and up to about 0.035 wt. % silicon, an addition consisting of about 0.20 to abou... | 05/14/1996 |
| 5511766 | Filtration device A vessel used for transfer of molten metal having a refractory filter wall with filters for removing inclusion from molten metal as it flows through the vessel. The refractory filter wall having passages sized according to a predetermined volume of molten... | 04/30/1996 |
| 5499798 | Refractory retaining apparatus An improvement is provided in apparatus for retaining refractory in a metallurgical vessel. The improvement includes a wedge-shaped metal ring extending along the inner periphery of a metal shell of the vessel adjacent to an opening at one end thereof and... | 03/19/1996 |
