Patents Assigned to Allegheny Ludlum Industries, Inc.
  • Patent number: 3999955
    Abstract: There is disclosed a material useful for making lead frames which comprises a core of ferritic stainless steel electroplated with a first layer of copper and an outside layer of nickel or tin, after which the strip is precision rolled to final gauge.
    Type: Grant
    Filed: July 15, 1975
    Date of Patent: December 28, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventors: Jack P. Martin, Thomas H. Gray
  • Patent number: 4000373
    Abstract: There is disclosed an electrode for overlay welding made up of laminations. All of the laminations are composited to be hot workable; and they may be austenitic stainless steel, ferritic stainless steel, duplex structures that are hot workable, or pure metals such as chromium. The combined composition of all laminations, when they are melted and resolidified, will contain at least 2%w of delta ferrite.
    Type: Grant
    Filed: February 24, 1975
    Date of Patent: December 28, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventors: Remus A. Lula, Donald J. McMahon
  • Patent number: 3997373
    Abstract: A ferritic stainless steel consisting essentially of, by weight, from 12-14% chromium, from 0.2-1.0% columbium, not more than 0.75% total of carbon, nitrogen, silicon, manganese, molybdenum, nickel, and copper; balance, essentially iron.
    Type: Grant
    Filed: October 1, 1975
    Date of Patent: December 14, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Richard Kazeva
  • Patent number: 3993445
    Abstract: A sintered ferritic stainless steel having an overall density no greater than 80% of full density. The steel consists essentially of, by weight, 12 to 30% chromium, up to 8% molybdenum, up to 2% silicon, up to 1.5% manganese, up to 0.04% phosphorus, up to 0.04% sulfur, up to 0.15% carbon, balance iron.
    Type: Grant
    Filed: November 27, 1974
    Date of Patent: November 23, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Orville W. Reen
  • Patent number: 3985586
    Abstract: A phosphoric acid flux with good fluxing efficiency and high viscosity, and one which is especially suitable for use in the soldering of copper and copper-plated stainless steel. The flux is in the form of a viscous fluid, or a thermally unstable emulsion when the fluid is combined with a pasty vehicle. The viscous fluid contains phosphoric acid and an organic material (molecular weight between 4,000 and 20,000) from the group consisting of polyethers and polyimines or mixtures thereof having an atomic ratio of carbon to ether oxygen plus imine nitrogen between 1.5 and 3.1.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: October 12, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Edward G. Choby, Jr.
  • Patent number: 3985587
    Abstract: A phosphoric acid flux with good fluxing efficiency and high viscosity, and one which is especially suitable for use in the soldering of copper, stainless steel and copper-plated stainless steel. The flux is in the form of a viscous fluid, or a thermally unstable emulsion when the fluid is combined with a pasty vehicle. The viscous fluid contains phosphoric acid, copper containing material and an organic material (molecular weight between 4,000 and 20,000) from the group consisting of polyethers and polyimines or mixtures thereof having an atomic ratio of carbon to ether oxygen plus imine nitrogen between 1.5 and 3.1.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: October 12, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Edward G. Choby, Jr.
  • Patent number: 3980444
    Abstract: A sintered stainless steel having an overall density of at least 95% of full density and a morphology comprised of regions of sintered austenitic stainless steel and regions of solidified liquid phase. Moreover, a sintered steel which is made by: pressing and sintering pre-alloyed powder consisting essentially of, by weight, up to 0.05% carbon, 22 to 26% chromium, 10 to 24% nickel, 2.7 to 5% molybdenum, 0.1 to 1% boron, up to 2.0% manganese, up to 2.0% silicon, balance iron and residuals.
    Type: Grant
    Filed: January 22, 1975
    Date of Patent: September 14, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Orville W. Reen
  • Patent number: 3976517
    Abstract: A process for producing electromagnetic silicon steel having a cube-on-edge orientation. The process includes the steps of: preparing an aluminum-bearing melt of silicon steel; casting the steel into an ingot; soaking the ingot at an elevated temperature; hot rolling the ingot into a bar of less than 2 inches in thickness; hot rolling the bar into a band of less than 0.2 inch in thickness, when the bar is at a temperature of from 1800 to 1900.degree.F; heat treating the steel; cold rolling the steel at a reduction of at least 75%; decarburizing the steel; and final texture annealing the steel.
    Type: Grant
    Filed: July 15, 1975
    Date of Patent: August 24, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventors: Denis A. Blank, Edward C. Falkowski, Richard K. Pitler
  • Patent number: 3964989
    Abstract: Apparatus for supplying current to a moving strip includes a tank having an electrolyte and grids therein. The strip passes through the tank from a roll on the inlet side of the tank. A pair of conductor rolls bear on the strip in spaced apart relationship as it passes over the inlet roll. A D. C. power source has one side connected to the grids and the other side connected through separate leads to each end of each conductor roll. A current limit device may be provided in each lead.
    Type: Grant
    Filed: January 13, 1975
    Date of Patent: June 22, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventors: Robert E. Ackerly, Roy C. Bongartz
  • Patent number: 3956809
    Abstract: A composite material which has a substantially reduced incidence of defects after drawing, and a method of producing it. The composite material is comprised of at least one layer of plain carbon steel containing up to 1.5% of carbide former present in a carbide former-to-carbon ratio of from about 1.5 to about 25 and at least one layer of stainless steel. It is formed by pressure bonding carbon steel containing carbide former to stainless steel.
    Type: Grant
    Filed: May 1, 1974
    Date of Patent: May 18, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Joseph A. Chivinsky
  • Patent number: 3954521
    Abstract: The application describes a process for producing grain oriented silicon steel wherein advantages are realized from the utilization of starting material with a relatively high carbon content. The process involves a series of steps including hot rolling, heat treating, cold rolling, normalizing, decarburizing and annealing.
    Type: Grant
    Filed: August 19, 1974
    Date of Patent: May 4, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Frank A. Malagari, Jr.
  • Patent number: 3953194
    Abstract: There is disclosed a process for reclaiming cemented metal carbide material by first subjecting the metal carbide material to catastrophic oxidation to produce a mixture of metal oxide and the oxide of the cement, reducing the metal oxide either mixed with the cement oxide or after being separated from it, and finally carburizing the reduced metal.
    Type: Grant
    Filed: June 20, 1975
    Date of Patent: April 27, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventors: Albert G. Hartline, III, John A. Campbell, Theodore T. Magel
  • Patent number: 3953201
    Abstract: A ferritic stainless steel consisting essentially of, in weight percent, from 10.5 to 19.0% chromium, up to 0.03% carbon, up to 0.03% nitrogen, up to 0.20% manganese, up to 0.20% silicon, up to 0.30% nickel, up to 0.10% aluminum, up to 0.20% copper, at least one element from the group consisting of titanium and molybdenum in an amount of titanium of from 4 (%C + %N) to 0.75% and in an amount of molybdenum of from 0.50 to 2.5%, balance essentially iron. Furthermore, a steel in which the titanium and molybdenum contents are present in respective amounts of less than 0.05 and 0.20% when they are present as residuals, and one in which the chemistry is balanced in accordance with the following equation:%C + %N + %Mn + %Si + %Ni + %Al + %Cu + % residual Ti + % residual Mo .ltoreq. 0.
    Type: Grant
    Filed: March 7, 1974
    Date of Patent: April 27, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventors: John Randolph Wood, Roger N. Wright
  • Patent number: 3948615
    Abstract: A fine grained alloy containing 38-45% nickel, 3-15% chromium, up to 0.1% copper, from 0.1-1.0% titanium and the balance iron and residuals that is useful for production of glass-to-metal seals is disclosed.
    Type: Grant
    Filed: July 28, 1975
    Date of Patent: April 6, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Thomas H. Gray
  • Patent number: 3948685
    Abstract: A fine grained alloy containing 38-45% nickel, 3-15% chromium, up to 0.1% copper, from 0.1-1.0% titanium and the balance iron and residuals that is useful for production of glass-to-metal seals is disclosed.
    Type: Grant
    Filed: July 28, 1975
    Date of Patent: April 6, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Thomas H. Gray
  • Patent number: 3944396
    Abstract: A pressure bonded composite article and a method for producing it. The article is comprised of a layer of plain carbon steel containing up to 1.5% of carbide former, a layer of stainless steel, and a layer of not readily oxidizable metal therebetween. The method comprises the steps of superimposing the layers, heating them at a temperature of from 1200.degree. to 2400.degree.F, and subsequently hot rolling them.
    Type: Grant
    Filed: July 26, 1974
    Date of Patent: March 16, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Joseph A. Chivinsky
  • Patent number: 3943010
    Abstract: There is disclosed a method for producing austenitic ferrous alloys containing from 21-45% manganese and from 10-30% chromium by exposing the alloys in solid form to nitrogen or nitrogen compounds at a temperature of at least 1700.degree.F for a time period sufficient to raise the nitrogen content of at least the surface of the alloy to at least 0.85%.
    Type: Grant
    Filed: June 12, 1974
    Date of Patent: March 9, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Albert G. Hartline, III
  • Patent number: 3938990
    Abstract: A substantially non-porous, austenitic stainless steel that is resistant to chloride pitting and a method of making it are disclosed. The steel includes from 21-45% manganese, from 10-30% chromium, from 1-4% nickel, from 0.85-3% nitrogen, up to 2% silicon, up to 1% carbon and the balance iron and residuals. In addition to containing elements within the above-noted composition ranges, the alloys must be such that:1. % Cr + 0.8(%Mn) - 11.8(%N - 0.1) - 1.23(%Ni) .gtoreq. 28.5 ##EQU1## The steels are cast and worked to avoid a dwell period in the temperature range 1000.degree.-1600.degree.F.
    Type: Grant
    Filed: September 5, 1974
    Date of Patent: February 17, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Albert G. Hartline, III
  • Patent number: 3936297
    Abstract: A substantially nonporous, austenitic stainless steel, and a method for producing it; consisting essentially of, in weight percent, from 10 to 30% chromium, from 15 to 45% manganese, from 0.85 to 3% nitrogen, up to 1% carbon, up to 2% silicon, balance essentially iron and residuals. Moreover, a steel wherein said elements are balanced in accordance with the following equations: ##EQU1##%Cr + 0.8 (%Mn) - 11.88 (%N - 0.1) - 28.25 .gtoreq.
    Type: Grant
    Filed: January 4, 1974
    Date of Patent: February 3, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Albert G. Harltine, III
  • Patent number: 3936323
    Abstract: There is disclosed a method for preparing nominally 13% chromium-0.3% columbium ferritic stainless steel by producing the steel to have very low content of residuals, carbon and nitrogen, hot rolling the steel, annealing the hot rolled steel, and cold rolling the annealed material to reduce the thickness at least 65 percent.
    Type: Grant
    Filed: January 13, 1975
    Date of Patent: February 3, 1976
    Assignee: Allegheny Ludlum Industries, Inc.
    Inventor: Richard Kazeva