Ferrous (i.e., Iron Base) Patents (Class 420/8)
  • Patent number: 4881990
    Abstract: The dissolved oxygen content in a bath of molten steel is controlled, in one embodiment, by diluting a slag layer atop the bath with an oxide such as lime (CaO), to reduce the percentage of MnO and FeO in the slag, and stirring the bath of molten steel. In another embodiment, a gaseous mixture of an inert gas and carbon monoxide is disequilibrium with the carbon and dissolved oxygen content is bubbled through the bath.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: November 21, 1989
    Assignee: Inland Steel Company
    Inventors: Howard M. Pielet, Larry A. Frank, William Edgar, Milan Alavanja
  • Patent number: 4820485
    Abstract: A method of producing an alloy containing at least one major ingredient selected from the group consisting of iron (Fe), cobalt (Co), and Nickel (Ni) and having low contents of sulphur, oxygen, and nitrogen, comprises steps of:(a) holding a molten alloy in a container selected from the group consisting of a lime crucible, a lime crucible furnace, a converter and a ladle lined with a basic refractory consisting of 15-85% of calcium oxide (CaO), and 15-75% of magnesium oxide (MgO), wherein said alloy consists essentially of at least one major ingredient selected from the group consisting of iron (Fe), nickel (Ni), and cobalt (Co);(b) adding at least one additive, based on the molten alloy, into said molten alloy in an atmosphere selected from the group consisting of a non-oxidizing atmosphere and a vacuum, wherein said additive is selected from the group consisting of aluminum (Al), aluminum alloys, silicon and silicon alloys;(c) desulphurizing, deoxidizing and denitrifying said molten alloy under an atmosphere
    Type: Grant
    Filed: February 3, 1987
    Date of Patent: April 11, 1989
    Assignees: Mitsui Engineering and Ship Building Co., Ltd., Metal Research Corporation
    Inventors: Tohei Ototani, Toru Degawa, Kenichi Kusumoto, Makoto Ebata
  • Patent number: 4802918
    Abstract: A case hardened steel having small oxygen, sulfur, and phosphorous contents and consisting essentially of, by weight, 0.10-0.30% carbon, not more than 0.50% silicon, not more than 1.50% manganese, not more than 0.012% phosphorous, not more than 0.009% sulfur, 0.02-0.04% aluminum, not more than 0.0010% oxygen, and 0.01-0.02% nitrogen, and a member or members selected from the group consisting of 0.20-1.50% chromium, 0.10-0.35% molybdenum, and 0.20-3.0% nickel, the remainder being iron together with impurities, and and a method of manufacturing the same.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: February 7, 1989
    Assignee: Aichi Steel Works, Limited
    Inventors: Takao Ooki, Jun Eguchi
  • Patent number: 4773931
    Abstract: Disclosed herein is spindle ferromagnetic alloy particles having the aspect ratio (major:minor) of less than 3:1 and the coercive force of 500 to 100 Oe, and containing 0.1 to 13 atomic % of Si to Fe, and a process for producing the same.
    Type: Grant
    Filed: January 23, 1987
    Date of Patent: September 27, 1988
    Assignee: Toda Kogyo Corp.
    Inventors: Akio Mishima, Yosiro Okuda, Hiroshi Sumita, Yoshitaka Yoshinaga, Akira Mukaizaka, Tokihiro Kurata
  • Patent number: 4737392
    Abstract: Bending and torsional ductility of high tensile reinforcement steel wire or cord, especially for rubber products, such as tires, is improved by taking care that the steel compositions that are currently used for such application, have an extra low sulphur content, i.e. below 0.015%, preferably below 0.010%.
    Type: Grant
    Filed: July 17, 1986
    Date of Patent: April 12, 1988
    Assignee: N.V. Bekaert S.A.
    Inventor: Paul Dambre
  • Patent number: 4659378
    Abstract: Electrical contacts to or mechanical connections between components and provided by using a thin layer of an alloy consisting of metals and metalloids. Such a layer shows excellent adhesion to glass or semiconductor substrates.
    Type: Grant
    Filed: June 22, 1984
    Date of Patent: April 21, 1987
    Assignee: International Standard Electric Corporation
    Inventors: Hans Volz, Peter Kersten
  • Patent number: 4659398
    Abstract: The present invention relates to a process for reducing internal stresses of roller straightened rails. After the straightening operation the rail web portion is heated for a short time to temperatures ranging between 200.degree.-700.degree. C., preferably between 350.degree.-500.degree. C., and after reaching the desired temperatures the rail is cooled by air to room temperature. For the purpose of heating the rail is continuously conveyed in front of the heating apparatus.The inventive process permits to reduce internal stresses in the rail head and base portions to a value of less than 50 N/mm.sup.2 thus ensuring increased rupture strength of the rail.
    Type: Grant
    Filed: January 14, 1986
    Date of Patent: April 21, 1987
    Assignee: Krupp Stahl Aktiengesellschaft
    Inventors: Wilhelm Heller, Lutz Weber, Reinhard Schweitzer, Jurgen Flugge