Patents Assigned to Allegheny Ludlum Corporation
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Patent number: 5370946Abstract: A pressure-bonded composite material includes at least one layer of a stabilized low carbon steel core material and one layer of a stainless steel joined at an interface, wherein the stabilized carbon steel includes columbium (niobium) and at least one other carbide-forming element in amounts effective to prevent carbon migration from the carbon steel to the stainless steel and the composite material has a physical grain size no larger than ASTM #6.Type: GrantFiled: March 31, 1993Date of Patent: December 6, 1994Assignee: Allegheny Ludlum CorporationInventor: Thomas R. Parayil
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Patent number: 5352304Abstract: A high strength low alloy steel having a yield strength of at least 100 ksi and a Charpy V-notch impact strength of at least 35 ft-lbs. at minus 84.degree. C. (minus 120.degree. F.) at thickness of up to 6 inches is provided wherein the steel consists essentially of an effective amount up to 0.036% carbon, for low temperature toughness up to 5% manganese, up to 1% silicon, up to 0.015% sulfur, 2 to 4% nickel, up to 2% copper, up to 0.1% niobium, and up to 0.1% aluminum, up to 4.% molybdenum, up to 4% chromium and the balance iron and incidental impurities and is characterized by low carbon bainite microstructure in the as-quenched condition.Type: GrantFiled: November 16, 1992Date of Patent: October 4, 1994Assignee: Allegheny Ludlum CorporationInventors: Anthony J. DeArdo, Robert A. Walsh
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Patent number: 5350464Abstract: A grain oriented silicon steel strip and method are provided for producing the same wherein a chevron pattern of scribe lines mechanically refines the magnetic domain wall spacings. Multiple chevron patterns are formed to extend always transversely across the strip width.Type: GrantFiled: November 17, 1992Date of Patent: September 27, 1994Assignee: Allegheny Ludlum CorporationInventor: James G. Benford
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Patent number: 5332416Abstract: A method and apparatus is provided for temporarily retaining slag and nonmetallic particles in a tundish while molten metal is being transferred through the tundish to other desired vessels. In particular, a meltable dam is placed into an opening between the chambers in a tundish, and the meltable dam retains an accumulation of molten metal in the pour chamber of the tundish with the slag and nonmetallic particles floating on top of that level such that the slag and nonmetallic particles are above the opening between the chambers of the tundish. The dam then completely melts and allows the transfer of molten metal through the opening. The slag and nonmetallic particles are retained in the pour chamber, however, because the molten metal being transferred into the pour chamber maintains the level in that chamber above the opening until almost all of the metal has been transferred into and through the chamber.Type: GrantFiled: April 23, 1992Date of Patent: July 26, 1994Assignee: Allegheny Ludlum CorporationInventor: James D. Calos
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Method and apparatus using magnetic flux scanning to test grain structure of magnetic sheet material
Patent number: 5327083Abstract: The grain structure of electrical steel strip is tested by inducing a magnetic flux field into the strip by pole pieces at opposite sides of a permanent magnet. A magnetic detector head between the pole pieces responds to the leakage of flux as the steel strip and/or magnetic detection undergoes relative movement. A recorder is used to identify banding and mixed grain structures which cause a smaller flux leakage amplitude than larger desired grains.Type: GrantFiled: March 19, 1992Date of Patent: July 5, 1994Assignee: Allegheny Ludlum CorporationInventors: Layton D. Crytzer, Leroy R. Balmer -
Patent number: 5312496Abstract: A grain oriented silicon steel strip is flattened by a skin pass rolling to flatten undulations caused by scribe lines imparted to the strip for mechanically refining the magnetic domain wall spacings.Type: GrantFiled: November 17, 1992Date of Patent: May 17, 1994Assignee: Allegheny Ludlum CorporationInventor: S. Leslie Ames
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Patent number: 5293926Abstract: A method and apparatus are provided for direct casting molten metal to continuous strip of crystalline material by controlling the supply of molten metal to a casting vessel substantially horizontal to an adjacent moving casting roll surface, the molten metal level in the exit end being near the crest of the casting roll, separating a semi-solid cast strip substantially horizontally from near the crest of the casting roll and providing secondary cooling while transporting the separated strip to solidify the strip.Type: GrantFiled: April 30, 1992Date of Patent: March 15, 1994Assignee: Allegheny Ludlum CorporationInventors: David B. Love, John D. Nauman, Karl Schwaha
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Patent number: 5286310Abstract: An low-nickel austenitic stainless alloy containing about 16.5 to about 17.5% by weight chromium; about 6.4 to about 8.0% by weight manganese; about 2.5 to about 5.0% by weight nickel; about 2.0 to less than about 3.0% by weight copper; less than about 0.15% by weight carbon; less than about 0.2% by weight nitrogen; less than about 1% by weight silicon; and the balance essentially iron with incidental impurities.Type: GrantFiled: October 13, 1992Date of Patent: February 15, 1994Assignee: Allegheny Ludlum CorporationInventors: Gary M. Carinci, Ivan A. Franson, Dominic A. Sorace, John P. Ziemianski
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Patent number: 5175026Abstract: A method of pretreating and hot-dip coating aluminum or aluminum alloys on a chromium-containing steel strip to provide an improved coating comprising annealing final gauge steel strip in an oxygen excess atmosphere to produce a chromium-rich oxide on the surface and thereafter electrolytically descaling the strip in an aqueous salt solution to remove the oxide and to expose a chromium depleted surface of the strip. The strip is then transported to a coating line where it is heated to a temperature at or above the temperature of a bath of aluminum or aluminum alloy. A substantially hydrogen atmosphere is maintained over the bath while the dew point is maintained below minus 35.degree. C. The strip is then drawn through the bath to coat the strip.Type: GrantFiled: July 16, 1991Date of Patent: December 29, 1992Assignees: Wheeling-Nisshin, Inc., Allegheny Ludlum CorporationInventors: William A. Bertol, Yoshio Hayashi, James B. Hill, Eisuke Otani, Donald R. Zaremski, John P. Ziemianski
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Patent number: 5162873Abstract: A system for creating a image of the surface contours of a metal workpiece, such as a continuous cast slab, is provided including a sheet of single frequency, planar light is directed to strike a surface of the workpiece, and a video camera positioned to view the surface where the light strikes, such that when the surface of the workpiece is flat, a straight line is sensed by the video camera, when the surface is irregular, the video camera senses a nonlinear line, the video camera creates a two dimensional image of the sensed light and supplies this signal to a processor, which then creates an image of the workpieces which is displayed by a video monitor and a printer. The processor extracts a variety of quantitative parameter values from the images.Type: GrantFiled: August 28, 1991Date of Patent: November 10, 1992Assignee: Allegheny Ludlum CorporationInventor: David L. Burk
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Patent number: 5131573Abstract: A method and device are described for preventing the atmospheric contamination of molten metal during the transfer thereof from one vessel to another. The device includes a first metal ring releasably connected to a molten metal receiving vessel and second metal ring connected to a vessel containing the molten metal to be transferred. A viewing port is provided to allow observation of the molten metal as it is being transferred. A ceramic fiber blanket which encloses the molten metal stream as it is being transferred interconnects the two rings. During operation, an opening of the molten metal containing vessel attached to the second ring and the ceramic fiber blanket are aligned concentrically above the opening of the receiving vessel and the first ring. In the preferred embodiment, the ceramic fiber blanket is then mated to the first metal ring to form an enclosure around the path defined between the molten metal containing vessel and the receiving vessel for the transfer of molten metal therebetween.Type: GrantFiled: March 22, 1991Date of Patent: July 21, 1992Assignee: Allegheny Ludlum CorporationInventors: Joseph W. Tommaney, Gordon J. Martin, Gary R. Bowerman, Reginald C. Buri
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Patent number: 5123977Abstract: A method is provided for improving the electrical characteristics of grain-oriented silicon steel sheet by heating the steel to temperatures above 1000.degree. F. and then deforming grooves to refine the magnetic domains, optionally, post heat treating to form fine recrystallized grains in the vicinity of the hot deformations, preferably using protrusions on a scribing roll as the sheet moves between a scribing roll and a back-up anvil roll at deforming pressures range up to 120,000 pounds per square inch.Type: GrantFiled: July 19, 1989Date of Patent: June 23, 1992Assignee: Allegheny Ludlum CorporationInventors: Leroy R. Price, Jeffrey M. Breznak
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Patent number: 5114501Abstract: 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: April 4, 1991Date of Patent: May 19, 1992Assignee: Allegheny Ludlum CorporationInventors: S. Leslie Ames, Jeffrey M. Breznak
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Patent number: 5103662Abstract: A method is provided for controlling interstand tension by roll gap adjustment to reduce gage variations caused by unplanned rolling velocity changes wherein a signal proportional to the tension changes produced by deviations from the desired speed ratio of adjacent stands is used to modify the conventional tension error signal before the latter signal is used to control roll gap thereby discriminating between tension changes caused by mill stand or strip physical changes, which it corrects, and tension changes caused by unplanned speed disturbances, which it ignores instead of maintaining constant tension. The resulting system exhibits improved tolerance for imperfect stand speed control.Type: GrantFiled: May 1, 1990Date of Patent: April 14, 1992Assignees: Allegheny Ludlum Corporation, Fapiano Consulting, Inc.Inventor: Donald J. Fapiano
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Patent number: 5101652Abstract: An insulating heat re-radiation - retention and infiltration air free system and method is provided for processing heated articles, including upper and lower heat shields to form, in combination with spaced apart rollers employed to support the articles, a substantial infiltration air-free enclosure, each of the heat shields are made-up of substantially high purity 100% ceramic fiber which is relatively non-porous and gap free and having fiber hot faces, the fiber of the heat shields being compressed and maintained in a high density condition, the fiber of the lower heat shield being formed to contact the circumferences of the rollers in a manner to prevent air from passing into the enclosure, the upper and lower heat shields being maintained in close proximity with the heated articles.Type: GrantFiled: July 26, 1990Date of Patent: April 7, 1992Assignee: Allegheny Ludlum CorporationInventors: David L. Burk, William M. Bloom, Terence L. Havranek
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Patent number: 5101650Abstract: A method for controlling metal strip thickness in a multi-stand rolling mill is provided which employs feed forward control to adjust the main drive armature current at the upstream mill stand when strip thickness data arrives at the downstream mill stand, establishes a control signal representing the desired speed of the first stand as a function of the second stand's measured speed, the strip thickness measurements, and the scheduled speeds of the first and second stands, develops an armature current reference modifier which is added to the current reference developed by the conventional speed regulator and thereby improves gage control by reducing the response time for upstream stand speed changes and by correcting upstream stand speed for unplanned changes in downstream stand speed.Type: GrantFiled: May 1, 1990Date of Patent: April 7, 1992Assignees: Allegheny Ludlum Corporation, Fapiano Consulting, Inc.Inventor: Donald J. Fapiano
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Patent number: 5087167Abstract: An adjustable lifting shoe assembly for sheet or sheet package lifting devices is disclosed. The assembly enables a plurality of lifting shoes suspended from a reinforced back plate to be slid laterally along the back plate to stradle and/or be inserted between full-width cross runners or circumferential bands extending beneath the sheet or sheet package. Such a construction is generally suspended from a crane or hoist and is useful in lifting all types of sheet packages.Type: GrantFiled: October 9, 1990Date of Patent: February 11, 1992Assignee: Allegheny Ludlum CorporationInventor: Richard H. Johnston
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Patent number: 5083867Abstract: A system for creating a image of the surface contours of a metal workpiece, such as a continuous cast slab, is provided including a sheet of single frequency, planar light is directed to strike a surface of the workpiece, and a video camera positioned to view the surface where the light strikes, such that when the surface of the workpiece is flat, a straight line is sensed by the video camera, when the surface is irregular, the video camera senses a nonlinear line, the video camera creates a two dimensional image of the sensed light and supplies this signal to a processor, which then creates an image of the workpieces which is displayed by a video monitor and a printer. The processor extracts a variety of quantitative parameter values from the images.Type: GrantFiled: November 28, 1988Date of Patent: January 28, 1992Assignee: Allegheny Ludlum CorporationInventor: David L. Burk
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Patent number: 5079939Abstract: A rolling mill strip wiper assembly is provided which includes an elongated strip wiper positionable transversely to the direction of travel of the moving strip, having a substantially rigid wiper body which supports on its exterior one or more layers of permeable media, one or more inlet ports in the wiper body for receiving a liquid which is channeled to outlets for permitting the liquid to impregnate the permeable media on at least one such strip wiper positionable on at least one side of the moving strip, thereby effectively removing and preventing accumulation of virtually all contaminate matter carried by the strip.Type: GrantFiled: March 25, 1991Date of Patent: January 14, 1992Assignee: Allegheny Ludlum CorporationInventor: James J. Shook
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Patent number: 5080326Abstract: A method is provided for improving the electrical characteristics of grain-oriented silicon steel sheet by heating the steel to temperatures above 1000.degree. F. and then deforming grooves to refine the magnetic domains, optionally, post heat treating to form fine recrystallized grains in the vicinity of the hot deformations, preferably using protrusions on a scribing roll as the sheet moves between a scribing roll and a back-up anvil roll at deforming pressures range up to 120,000 pounds per square inch.Type: GrantFiled: January 4, 1991Date of Patent: January 14, 1992Assignee: Allegheny Ludlum CorporationInventors: Leroy R. Price, Jeffrey M. Breznak