Patents by Inventor Ashok K. Khare
Ashok K. Khare has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20030156966Abstract: A low alloy steel, designated 0301 (Khare IV) steel, that may be used for making pipe molds with high hardenability, high ductility and high toughness are described, the steel consisting essentially of from about 0.16% to about 0.22% carbon, about 0.60% to about 0.90% manganese, about 0.50% to about 0.65% silicon, about 0.015% maximum phosphorus, about 0.015% maximum sulfur, about 2.25% to about 2.55% chromium, about 0.40% to about 0.50% molybdenum, about 0.55% to about 0.65% nickel, about 0.03% to about 0.08% vanadium, and balance essentially iron.Type: ApplicationFiled: December 10, 2002Publication date: August 21, 2003Applicant: National Forge CompanyInventor: Ashok K. Khare
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Publication number: 20030147768Abstract: A low alloy steel, designated 0303 (Khare V) steel, that may be used for making pipe molds with high hardenability, high ductility and high toughness are described, the steel consisting essentially of from about 0.16% to about 0.22% carbon, about 1.00% to about 1.50% manganese, about 1.15% to about 1.45% silicon, about 0.015% maximum phosphorus, about 0.015% maximum sulfur, about 0.80% to about 1.10% chromium, about 0.20% to about 0.30% molybdenum, about 0.50% maximum nickel, about 0.03% to about 0.08% vanadium, and balance essentially iron.Type: ApplicationFiled: December 10, 2002Publication date: August 7, 2003Applicant: National Forge CompanyInventor: Ashok K. Khare
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Patent number: 5334269Abstract: An interrupted normalize heat treatment process for ferritic alloy steel that includes the steps of rapidly cooling at least the outer surfaces of the steel from a temperature above the Ac temperature to a temperature below the Ar, temperature and during subsequent air cooling to room temperature reheating the outside surfaces of the ferritic alloy steel back above the Ar, temperature by bleed back heat from the steel, and forming an as interrupting normalized workpiece having substantially bainitic structures.Type: GrantFiled: October 20, 1992Date of Patent: August 2, 1994Assignee: National Forge CompanyInventors: Ashok K. Khare, Michael Scott
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Patent number: 5330707Abstract: A ferritic alloy steel that may be used for making very large pipe molds with high ductility and high toughness for centrifugally casting pipe with an inside diameter that may exceed 40 inches, the steel consisting essentially of from about 0.12% to about 0.18% carbon, about 0.70% to about 0.95% manganese, about 0.008% maximum phosphorous, about 0.008% maximum sulphur, about 0.20% to about 0.35% silicon, about 1.05% to about 1.25% nickel, about 1.85% to about 2.25% chromium, about 0.60% to about 0.75% molybdenum, about 0.03% to about 0.08% vanadium, and balance essentially iron.Type: GrantFiled: June 25, 1993Date of Patent: July 19, 1994Assignee: National Forge CompanyInventor: Ashok K. Khare
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Patent number: 5174836Abstract: An interrupted normalization heat treatment process for ferritic alloy steel that includes the steps of rapidly cooling at least the outer surfaces of the steel from a temperature above the Ac.sub.3, temperature to a temperature below the Ar.sub.1, temperature and during subsequent air cooling to room temperature reheating the outside surfaces of the ferritic alloy steel back above the Ar.sub.1, temperature by bleed back heat from the steel, tempering the air cooled workpiece, and forming an as interrupting normalized workpiece having substantially bainitic structures.Type: GrantFiled: March 3, 1992Date of Patent: December 29, 1992Assignee: National Forge CompanyInventors: Ashok K. Khare, Michael Scott
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Patent number: 4992239Abstract: A ferritic alloy steel with high ductility and high toughness, and a controlled microstructure for making pipe molds for centrifugally casting pipe consisting essentially of from about 0.12% to about 0.22% carbon, about 0.40% to about 0.80% manganese, about 0.025% maximum phosphorus, about 0.025% maximum sulphur, about 0.15% to about 0.40% silicon, about 0.00% to about 0.55% nickel, about 0.80% to about 1.20% chromium, about 0.15% to about 0.60% molybdenum, about 0.03% to about 0.08% vanadium, and balance essentially iron.Type: GrantFiled: January 24, 1990Date of Patent: February 12, 1991Assignee: National Forge CompanyInventor: Ashok K. khare
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Patent number: 4919735Abstract: A ferritic alloy steel with high ductility and high toughness, and a controlled microstructure for making pipe molds for centrifugally casting pipe consisting essentially of from about 0.12% to about 0.22% carbon, about 0.4% to about 0.80% manganese, about 0.025% maximum phosphorus, about 0.025% maximum sulphur, about 0.15% to about 0.40% silicon, about 0.00% to about 0.55% nickel, about 0.80% to about 1.26% chromium, about 0.15% to about 0.60% molybdenum, about 0.03% to about 0.08% vanadium, and balance essentially iron.Type: GrantFiled: December 29, 1988Date of Patent: April 24, 1990Assignee: National Forge CompanyInventor: Ashok K. Khare
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Patent number: 4818301Abstract: A process for producing large section, large mass forged sleeves of alloy 625 comprising forming the workpiece from large, diameter ingots of alloy 625 or from hot isostatically pressed alloy 625 powder, saddle forging the workpiece, mandrel forging the workpiece, thermal treating the workpiece and finish machining the workpiece.Type: GrantFiled: November 23, 1987Date of Patent: April 4, 1989Assignee: National Forge CompanyInventor: Ashok K. Khare
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Patent number: 4781768Abstract: A process for producing large section, large mass cylindrical sleeves of alloy 625 by employing full length saddle forging techniques comprising forming the workpiece into a full length member, saddle forging the workpiece, air cooling the forging to room temperature following saddle forging, thermal treating and annealing the forging and finish machining the forging to form the finished large section, large mass cylindrical sleeve of alloy 625.Type: GrantFiled: November 23, 1987Date of Patent: November 1, 1988Assignee: National Forge CompanyInventor: Ashok K. Khare
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Patent number: 4714499Abstract: A process for producing large section, large mass cylindrical sleeves of alloy 625 by employing full length saddle forging technique comprising forming the workpiece by forging it into a full length member, trepanning the member to form the workpiece, saddle forging the workpiece, air cooling the forging to room temperature following saddle forging, thermal treating and annealing the forging and finish machining the forging to form the finished large section, large mass cylindrical sleeve of alloy 625.Type: GrantFiled: October 1, 1986Date of Patent: December 22, 1987Assignee: National Forge CompanyInventor: Ashok K. Khare
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Patent number: 4714498Abstract: A process for producing large section, large mass forged sleeves from large diameter ingots of alloy 625 comprising the steps of cutting the ingot to produce the workpiece, trepanning the workpiece and facing the ends of the workpiece, saddle forging the workpiece, mandrel forging the workpiece, thermal treating the workpiece and finish machining the workpiece.Type: GrantFiled: June 27, 1986Date of Patent: December 22, 1987Assignee: National Forge CompanyInventor: Ashok K. Khare
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Patent number: 4608851Abstract: A process for warm-working a forged austenitic stainless steel workpiece to improve its mechanical and physical properties is disclosed. The workpiece is subjected to a force great enough to cause deformation while the surface temperature of the workpiece is elevated in the range of above about 200.degree. F. (95.degree. C.) to below the lower critical temperature. The purpose of using elevated temperatures is to reduce the force required to deform the workpiece. Stabilized austenitic stainless steel can be warm-worked and still maintain its corrosion-resistant properties. The advantages of warm-working over cold-working to achieve properties are reduction of noise and improved metallurgical control.Type: GrantFiled: November 1, 1985Date of Patent: September 2, 1986Assignee: National Forge Co.Inventor: Ashok K. Khare
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Patent number: 4601322Abstract: A pipe mold for centrifugally casting pipe is disclosed. The pipe mold according to the present invention is made by depositing weld material on a rigid shell. The rigid shell is obtained by forming a flat plate into a cylinder and welding the resultant seam. Additional rigid shells can be circumferentially welded together to obtain a desired length. The welded seams are areas of weakness called metallurgical notches. To eliminate the metallurgical notches, weld material is deposited on the shell. In one embodiment, weld material is deposited on the outside of the shell. The shell then is machined away. The resultant pipe mold has a total wall thickness comprising weld material and is free of metallurgical notches. In addition, the need for furnace heat-treatment to achieve properties in the weld material can be eliminated.Type: GrantFiled: March 13, 1984Date of Patent: July 22, 1986Assignee: National Forge CompanyInventor: Ashok K. Khare