Patents Assigned to Allegheny Ludlum Corporation
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Patent number: 5078811Abstract: A method is provided to effect domain refinement of grain-oriented silicon steel sheets having a surface layer of forsterite by applying to the layer a phosphorus-rich flux-printing agent having a desired composition, and degree of fluidity in a sufficient amount to effect removal of the forsterite layer in a striped pattern with sufficient phosphorus to subsequently chemically stripe the underlying metal with phosphide-bearing bodies to produce in the steel a heat-proof domain refinement with improved lower core loss values, after first heating in an oxidizing atmosphere and second heating in a reducing atomsphere.Type: GrantFiled: September 29, 1989Date of Patent: January 7, 1992Assignee: Allegheny Ludlum CorporationInventors: S. Leslie Ames, Charles D. Boyer
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Patent number: 5055362Abstract: To obtain a composite material which has a substantially reduced incidence of defects after forming, there is made a composite having at least one layer of plain-carbon steel and, between it and a layer of stainless steel, an interleaving layer of silicon steel.Type: GrantFiled: September 22, 1989Date of Patent: October 8, 1991Assignee: Allegheny Ludlum CorporationInventors: Ronald J. McCormick, G. Leonard Yeager
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Patent number: 5045350Abstract: A method is provided to reduce the core loss measured at frequencies of 60 Hz or higher in light-gauge, grain-oriented, silicon steel sheet or strip of less than 7 mil thickness and conventional permeability of .mu.10<1850 at 60 Hz, the method includes coating such steel with tension-inducing stress coatings in order to exert tensile stresses on the silicon steel of at least approximately 600 psi and further provides a method with the step of preparing the surfaces of the light-gage, grain-oriented, silicon steel products to support the stresses of the applied tension-inducing stress coatings in order to prevent spalling of the coatings.Type: GrantFiled: October 10, 1989Date of Patent: September 3, 1991Assignee: Allegheny Ludlum CorporationInventors: James G. Benford, Edward Choby, Jr.
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Patent number: 5041170Abstract: An improvement in a method for improving the magnetic domain wall spacing of grain-oriented silicon steel sheet having an insulating coating thereof, wherein the sheet is subjected to metallic contaminants, particularly phosphorus and phosphorus compounds, to refine magnetic domains, followed by a rolling procedure, followed by a stress relief anneal to provide a smooth surface on the sheet and reduced core loss.Type: GrantFiled: November 9, 1989Date of Patent: August 20, 1991Assignee: Allegheny Ludlum CorporationInventors: S. Leslie Ames, Jeffrey M. Breznak
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Patent number: 5011548Abstract: For making a ductile boron-containing grain-oriented silicon steel, there is practiced, at a late stage in the making of the product either during the final texture anneal or a subsequent anneal, a high-temperature anneal in a reducing atmosphere with the use of a separating-agent coating, particularly magnesium oxide, which contains an effective amount of a compound of molybdenum and/or tungsten.Type: GrantFiled: July 28, 1988Date of Patent: April 30, 1991Assignee: Allegheny Ludlum CorporationInventor: Douglas C. Dean
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Patent number: 4993170Abstract: A novel micrometer apparatus is provided which is capable of providing strip workpiece thickness measurements with high precision and without operator dependence, the apparatus including a fixed anvil mounted to a "C" frame, a movable shaft mounted opposite the fixed anvil at a separation distance from the fixed anvil which represents the thickness of material therebetween, the fixed anvil being held in position by the full weight of the apparatus and the center of gravity of the apparatus passes through the fixed anvil and solidly against the top surface of the essentially horizontal strip being measured, an indicator having a measuring head for carrying the movable shaft which contacts the bottom side of the strip opposite the fixed anvil, and a display head positioned atop the micrometer apparatus above the strip such that the thickness measurement is performed and displayed automatically while the apparatus sits unattended on the workpiece.Type: GrantFiled: March 26, 1990Date of Patent: February 19, 1991Assignee: Allegheny Ludlum CorporationInventor: David L. Burk
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Patent number: 4968361Abstract: A method is provided for domain refinement of final texture annealed grain-oriented silicon steel by removing portions of the base coating to substantially expose a line pattern of the underlying silicon steel by applying in the pattern an agent to the coated steel, heating the agent to activate it to cause substantial removal of the base coating in the line pattern and effecting heat resistant domain refinement and reduced core loss by allowing thermal and chemical treatment activity on the exposed steel.Type: GrantFiled: March 23, 1989Date of Patent: November 6, 1990Assignee: Allegheny Ludlum CorporationInventors: S. Leslie Ames, Charles D. Boyer
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Patent number: 4964926Abstract: A weldable ferritic stainless steel and a method for producing the same is provided wherein the steel consists essentially of up to 0.03 carbon, up to 0.05 nitrogen, 10 to 25 chromium, up to 1.0 manganese, up to 0.5 nickel, up to 1.0 silicon, 0.03 to 0.35 titanium, 0.10 to 1.0 niobium, optionally up to 1.2 aluminum, the balance essentially iron, the amounts of titanium and niobium varying inversely and not more than necessary to satisfy specific thermodynamic equations and the method includes casting the steel into ingots or slabs without the precipitation of detrimental intermetallic or nonmetallic titanium compounds so that the hot-rolled band gauge, without grinding, can be cold rolled to final gauge sheet or strip free of open surface defects.Type: GrantFiled: December 15, 1988Date of Patent: October 23, 1990Assignee: Allegheny Ludlum CorporationInventor: James B. Hill
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Patent number: 4964922Abstract: Grain-oriented silicon steel having an insulation coating such as a forsterite layer on its outer surface, on which is scribed by a low pressure abrasion technique a predetermined pattern of stripes to expose the metal substrate, in a manner that little or no effect will be experienced with respect to magnetic properties, but will constitute essential preparation for improvement in properties when chemical treatment of the exposed metal stripes is performed.Type: GrantFiled: July 19, 1989Date of Patent: October 23, 1990Assignee: Allegheny Ludlum CorporationInventors: S. Leslie Ames, Jeffrey M. Breznak
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Patent number: 4953177Abstract: A method and apparatus is provided for controlling the atmosphere above the bath of an electroslag remelting furnace, including sealing the atmosphere of the furnace directly above the crucible by employing a shell secured to the crucible and a shroud secured between the shell and the movable furnace ram to encapsulate the atmosphere, and analyzing the oxygen content of the atmosphere and controlling the amount of oxygen therein by introducing an inert gas in the atmosphere.Type: GrantFiled: July 3, 1989Date of Patent: August 28, 1990Assignee: Allegheny Ludlum CorporationInventors: Joseph W. Tommaney, Peter S. Andolina, Reginald C. Buri
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Patent number: 4948675Abstract: By adding an appropriate amount, 1 to 12 weight percent, based on the amount of magnesium oxide present and Loss On Ignition values of powdered magnesium metal to the magnesium oxide aqueous slurry composition used to make a separating-agent composition in the making of grain-oriented silicon electrical steel, there are obtained composition, an article, and a method characterized principally by a substantial decrease in the rate of rejections of the produce of the final texturizing anneal because of coating defects--such difficulties as bare spots, and metal-overlay pattern. Moreover, the magnetic properties may be improved because of improved control of the propagation of the internally oxidized zone of the steel.Type: GrantFiled: May 19, 1989Date of Patent: August 14, 1990Assignee: Allegheny Ludlum CorporationInventors: Nazmi Toker, Leroy R. Price
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Patent number: 4944495Abstract: A leveling apparatus for leveling a surface of refractory bed comprised of refractory pebbles. The leveling apparatus is comprised of a disk having a level bottom surface suitable for positioning upon the surface of the refractory bed. A plurality of spaced apart, downwardly extending tooth members project beneath the level, bottom surface of the disk, and into the refractory bed. Rotation of the disk causes the plurality of tooth members to displace the refractory pebbles in a rake-like manner to thereby level the surface of the refractory bed by causing the refractory pebbles to conform to the level bottom surface of the disk.Type: GrantFiled: January 30, 1989Date of Patent: July 31, 1990Assignee: Allegheny Ludlum CorporationInventors: Robert H. Johns, J. Richard Rzomp
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Patent number: 4938459Abstract: A tuyere block assembly design permitting intermittent flow of gas into the bottom of a metallurgical vessel is provided having the tuyere block assembly open to permit flow of gas into the vessel and closes when the flow of gas into the furnace is not desired without the requirement that gas be continuously injected through the tuyere block in order to keep the block open and operational.Type: GrantFiled: June 8, 1989Date of Patent: July 3, 1990Assignee: Allegheny Ludlum CorporationInventor: George Cingle, III
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Patent number: 4931613Abstract: A method and apparatus are provided for domain refinement of texture annealed and insulation coated grain-oriented silicon steel strip by contacting the insulated steel surface to be scribed with a discharge electrode, providing a high voltage-low current and low voltage-high current to the electrode, moving the electrode across the steel while essentially maintaining contact therewith, and marking the steel with a plurality of indentations generally aligned across the steel surface by pulsing the high current to produce a plurality of electrical discharges.Type: GrantFiled: March 18, 1988Date of Patent: June 5, 1990Assignee: Allegheny Ludlum CorporationInventors: James A. Salsgiver, Eugene W. Bartel, Rowland C. Rudolf, III
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Patent number: 4919733Abstract: A method is provided for domain refinement of electrical sheet products, such as grain-oriented silicon steel and amorphous magnetic materials, by subjecting at least one surface of the steel to an electron beam treatment to produce narrow substantially parallel bands of treated regions separated by untreated regions substantially transverse to the direction of strip manufacture to improve core loss without damaging the surface or any coating thereon.Type: GrantFiled: March 3, 1988Date of Patent: April 24, 1990Assignee: Allegheny Ludlum CorporationInventors: James A. Salsgiver, Randal K. Knipe, Carl P. Stroble
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Patent number: 4919465Abstract: Protector for "C" hooks used to elevate and transport coils of metallic material and the like wherein urethane rubber is vulcanized to the hook in strategic areas which contact or have the potential of contacting the sides of a coil of strip material. A replaceable insert is used in the high-wear area of the forward end of the lower horizontal leg of the hook.Type: GrantFiled: November 3, 1988Date of Patent: April 24, 1990Assignee: Allegheny Ludlum CorporationInventors: Michael P. Gembarosky, Gary S. Clark, Howard E. Baybrook, Arthur E. Trudgeon
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Patent number: 4915750Abstract: A method is provided for heat resistant domain refinement of texture annealed and insulation coated grain-oriented silicon steel strip and amorphous magnetic materials by subjecting at least one surface of the steel to an electron beam treatment to produce permanent defects to effect domain refinement with narrow substantially parallel bands of treated regions separated by untreated regions substantially transverse to the direction of strip manufacture.Type: GrantFiled: March 3, 1988Date of Patent: April 10, 1990Assignee: Allegheny Ludlum CorporationInventors: James A. Salsgiver, Randal K. Knipe
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Patent number: 4911766Abstract: A method is provided for refining the magnetic domain wall spacing of grain-oriented silicon steel having a forsterite base coating thereon by removing portions of the base coating to expose a pattern of the underlying silicon steel, providing the exposed silicon steel with an environment selected from the group of phosphorus and phosphorus-bearing compounds, and then annealing the exposed steel, which is free of thermal and plastic stresses, in the phosphorus environment in a reducing atmosphere to produce in the steel a line of permanent bodies containing a phosphorus-bearing compound to effect heat resistant domain refinement and reduced core loss.A semi-finished sheet product of final texture annealed grain-oriented silicon steel is also provided.Type: GrantFiled: June 10, 1988Date of Patent: March 27, 1990Assignee: Allegheny Ludlum CorporationInventors: S. Leslie Ames, Jeffrey M. Breznak
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Patent number: 4911886Abstract: An austenitic alloy is provided having a desirable combination of properties by melting an alloy containing 25 to 27 weight percent chromium, 20 to 40 weight percent nickel, 5 to 7.0 percent molybdenum, 0.25 to 0.30 weight percent nitrogen, and the balance iron and incidental impurities. The alloys exhibit a CCCT value of greater than 49 degrees Centigrade, together with other desirable properties, can be so produced, while maintaining the level of resistance to stress corrosion cracking at a level higher than that of AISI Type 316L stainless steel.Type: GrantFiled: March 17, 1988Date of Patent: March 27, 1990Assignee: Allegheny Ludlum CorporationInventors: Richard K. Pitler, John F. Grubb
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Patent number: 4906305Abstract: To obtain a composite material which has a substantially reduced incidence of defects after forming, there is made a composite having at least one layer of plain-carbon steel and, between it and a layer of stainless steel, an interleaving layer of silicon steel.Type: GrantFiled: August 18, 1988Date of Patent: March 6, 1990Assignee: Allegheny Ludlum CorporationInventors: Ronald J. McCormick, G. Leonard Yeager