Patents Examined by P. D. Rosenberg
  • Patent number: 4401465
    Abstract: A desulfurizing agent is provided comprising magnesium granules having a surface consisting essentially of a fluoride-containing salt.
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: August 30, 1983
    Assignee: AMAX Inc.
    Inventors: Ramaswami Neelameggham, John C. Priscu
  • Patent number: 4401464
    Abstract: The invention relates to a method and equipment of producing with good reproducibility steel which is extremely free from slag inclusions, particularly steel with low sulphur content and thus very low contents of sulphidic slag inclusions, starting with a steel melt which is decarburized in a melting furnace, converter or the like to the desired carbon content, after which subsequent refining is carried out by an injection method in a ladle.
    Type: Grant
    Filed: April 12, 1982
    Date of Patent: August 30, 1983
    Assignee: Scandinavian Lancers Aktiebolaget
    Inventor: Bertil G. Tivelius
  • Patent number: 4400208
    Abstract: A process for producing iron, phosphorus, carbon and chromium based amorphous metal alloys of the type in which a metal alloy in the liquid phase is cooled very rapidly to obtain a vitreous structure, wherein the liquid phase is prepared from cast iron, phosphorus and chromium. This process provides a low cost amorphous alloy as compared to that of crystalline products, and one which, however, possesses improved properties. The invention also relates to the amorphous alloy obtained having the following composition by atomic percentage: Cr: 1.5 to 8; C: 8 to 16; P: 4 to 12; Si: up to 3.5; the remainder being iron and the P/C ratio being less than 1.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: August 23, 1983
    Assignee: Pont A Mousson S.A.
    Inventor: Luc Ackermann
  • Patent number: 4399982
    Abstract: A blast furnace taphole plugging composition comprising a coal tar binder, a refractory filler and a very heavy aromatic petroleum oil which fails to polymerize at the high heating rates experienced during normal application of the taphole mix to the taphole. Preferred aromatic petroleum oils useful in the present invention have a minimum boiling temperature of 700.degree. F. and above and a boiling range between 700.degree. F. and 1000.degree. F. Methods of making and using such plasticized tar bonded blast furnace taphole mixes are also disclosed.
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: August 23, 1983
    Assignee: General Refractories Company
    Inventor: Francis W. Henry, Jr.
  • Patent number: 4400206
    Abstract: A process for estimating a particle size segregation in a burden layer at a blast furnace top is disclosed, which comprises measuring a particle size distribution of a burden material before the charging and a layer thickness distribution of the burden layer after the charging, and estimating a particle size distribution at every position in the burden layer charged at the furnace top on the basis of the above measured values, charging conditions and furnace operating conditions according to a simulation model of particle size segregation.
    Type: Grant
    Filed: May 28, 1981
    Date of Patent: August 23, 1983
    Assignee: Kawasaki Steel Corporation
    Inventor: Mikio Kondo
  • Patent number: 4400207
    Abstract: The pulverulent metal oxide, especially molybdenum oxide is mixed, to increase the metal conversion, with a stoichiometric quantity of finely divided ferrosilicon. This mixture is combined with about 5% by weight bentonite as a binder and agitated with about 3 weight % water and formed into briquettes with the aid of a conventional briquetting unit. To facilitate an exact metering of the additive of the metal oxide to the steel melt, the smallest caliber possible briquettes are produced.
    Type: Grant
    Filed: May 11, 1982
    Date of Patent: August 23, 1983
    Assignee: Continental Alloys S.A.
    Inventor: Aloyse Tanson
  • Patent number: 4399985
    Abstract: The invention relates to metallurgical lances. Normally such lances are formed by a heavy metal tube encased in a refractory sleeve and because of their relatively long length such lances flex in use thereby propogating cracks in the refractory and encouraging the growth of cracks that are otherwise formed during shock loading of the lance as it enters the bath of metal and because of differential expansion that occurs between the refractory and the tube. The object of the invention is to provide a lance of high rigidity and reduced tendancy to cracking and spalling which objective is met by a metallurgical lance having a tubular member for the passage of gas or the mixture of gases and solids, said member being encased in a sleeve of an appropriate refractory, there being arranged around the periphery of the tubular member, and spaced therefrom, a number of longitudinal reinforcing members also encased in the refractory sleeve.
    Type: Grant
    Filed: April 1, 1982
    Date of Patent: August 23, 1983
    Assignee: Monoconstruction Limited
    Inventor: Owen Eastwood
  • Patent number: 4398946
    Abstract: A method of producing homogeneous cast-iron melts from a heterogeneous charge containing a proportion of steel scrap of up to very high amount as well as other ordinary charge components, such as pig iron, broken castings, recycle material and furnace additives, characterized by the fact that by the addition of compacts of silicon carbide or other alloying substances and/or ordinary charge components containing slag-forming admixtures from the ternary system 8-18% CaO-10-40% SiO.sub.2 --2-16% Al.sub.2 O.sub.3 which contain additions of hydrocarbon and/or hydrocarbon-nitrogen compounds, a reductive furnace atmosphere and a limiting of suboxide-containing primary slags, a practically loss-free carburization and silicification as well as a favorable condition of nucleation of the homogenized melt is brought about, as well as compacts for carrying out the said method, are disclosed.
    Type: Grant
    Filed: September 2, 1981
    Date of Patent: August 16, 1983
    Assignee: Werner Kessl Giessereibedarf GmbH
    Inventor: Heinz-Ulrich Doliwa
  • Patent number: 4398948
    Abstract: Methods for controlling blowing, controlling the slag formation and predicting sloping in the blowing of molten pig iron in LD converter are carried out by measuring acceleration of the horizontal movement of a detector, such as a lance provided in the converter, which is caused only by the slag impinging against the lance, by an accelerator, integrating the measured values to obtain integrated average values at every several seconds, and programming the integrated average values in a computer.
    Type: Grant
    Filed: May 28, 1981
    Date of Patent: August 16, 1983
    Assignee: Kawasaki Steel Corporation
    Inventors: Kanji Emoto, Masayuki Onishi, Hirosuke Yamada, Katsuhisa Hirayama, Hideshi Ohzu, Masakatsu Ogawa, Yasuo Masuda
  • Patent number: 4398947
    Abstract: The invention provides an article of manufacture comprising magnesium granules characterized by a surface coating of at least one anti-caking agent selected from the group consisting of magnesium, calcium and aluminum stearate.
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: August 16, 1983
    Assignee: Amax Inc.
    Inventors: Ramaswami Neelameggham, John C. Priscu
  • Patent number: 4398949
    Abstract: A method for stably refining high carbon steel by top and bottom blown converter refining in which the entire quantity or part of refining pure oxygen is blown onto molten iron through a top blowing lance nozzle while blowing an inert gas into the converter through a nozzle at the bottom thereof, and wherein the bottom blown inert gas is fed at a rate less than 0.09 Nm.sup.3 /min.multidot.ton during the blowing and/or at a rate less than 0.03 Nm.sup.3 /min.multidot.ton in a controlling stage immediately after turndown.
    Type: Grant
    Filed: October 28, 1981
    Date of Patent: August 16, 1983
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Minoru Kitamura, Shinji Koyama, Shuzo Ito, Masahiko Ohgami, Hideaki Fujimoto
  • Patent number: 4397685
    Abstract: Low alloy steel having an ultra low carbon content is produced using the basic oxygen process wherein an inert gas is introduced into the melt when the melt has a carbon content below about 0.06 weight percent, the oxygen flowrate is adjusted to from 10 to 40 percent of the inert gas flow rate and the oxygen lance height is reduced to from 30 to 60 percent of the normal lance height.
    Type: Grant
    Filed: March 26, 1982
    Date of Patent: August 9, 1983
    Assignee: Union Carbide Corporation
    Inventors: Wayne J. Maddever, Michael T. Burns, Jennings B. Lewis
  • Patent number: 4396181
    Abstract: A converter for refining liquid metals having a cylindrical horizontally disposed vessel (1) with a first opening (6) for charging and pouring and a second opening (13) circumferentially and longitudinally displaced from the first opening for exhaust gases to escape, is disclosed. The circumferential displacement is sufficient to prevent liquid metal from pouring from the second opening (13) when the vessel is rotated from a first position for charging materials into the vessel (1) through the first opening (6) to a second position for pouring the contents of the vessel (1) from opening (6). Cool air is provided to a region between the vessel (1) and a jacket (15) surrounding the vessel (1). A hood (14) collects the exhaust gases from the second opening (13) in any position to which the vessel (1) is rotated when it is used. End and circumferential seals structures are provided where hood (14) longitudinally and circumferentially contacts jacket (15).
    Type: Grant
    Filed: November 19, 1980
    Date of Patent: August 2, 1983
    Assignee: Inspiration Consolidated Copper Company
    Inventors: Allan F. Tittes, Kenneth H. Larson, Elmer E. Burton, Kennith L. Britton
  • Patent number: 4396426
    Abstract: Lead is recovered from sulphidic lead raw-material containing impurities of the kind bismuth, arsenic, antimony and tin, by flame-smelting the material with an oxygen-containing gas. The oxygen potential and temperature are adapted during the flame-smelting process so that the product formed thereby comprises substantially a lead-sulphide melt substantially free of volatile, sulphidic and metallic impurities of the said kind. The lead-sulphide melt is brought into contact with an oxidic lead material substantially free of impurities of the aforementioned kind, while oxidizing the sulphide-sulphur content of the material and forming a melt substantially free of sulphur. Lead is recovered from the melt by separation, optionally after subjecting the melt or a part thereof to a reducing process.
    Type: Grant
    Filed: November 18, 1981
    Date of Patent: August 2, 1983
    Assignee: Boliden Aktiebolag
    Inventors: Torsten E. Jensfelt, Stig A. Petersson
  • Patent number: 4396182
    Abstract: A lance for blowing an oxydizing gas onto a bath of molten metal, especially for blowing oxygen on a bath of molten pig iron for transforming the same into steel. The lance is provided in an end wall of its nose with at least one central aperture for blowing gas jets at great impulsion onto the bath and a plurality of auxiliary apertures for blowing gas streams of considerably smaller impulsion onto the bath. The auxiliary apertures are constituted by elongated slots through the end wall arranged spaced from each other along a circle at a distance of adjacent edges of the slots and that at least one main aperture of about 2-20 cm. This construction permits to improve the amount of secondary combustion of the reaction gas while prolonging the useful life of the nose of the lance. The lance is advantageously used in conjunction with blowing a stirring gas through the bath of molten metal through refractory gas permeable elements provided in the bottom of a crucible containing the bath.
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: August 2, 1983
    Assignee: Institut de Recherches de la Siderurgi Francaise
    Inventors: Bernard Schaffar, Hugues Zanetta
  • Patent number: 4396428
    Abstract: The present invention is directed to processes and apparatus for carrying out said processes wherein molten cast iron is treated with a predominantly iron alloy having the essential elements by weight of from about 0.1 to about 10.0% silicon and about 0.5 to about 4.0% magnesium. The alloy may comprise from about 0.1 to about 10.0% silicon, about 0.5 to about 4.0% magnesium, up to about 2.0% of one or more rare earth elements such as cerium about 0.5 to about 6.5% carbon, the balance being iron. Small amounts of calcium, barium or strontium and trace elements customarily found in conventional raw material may be present in the alloy. The characteristics of the alloy make it possible to establish a ready supply of treated molten iron in the foundry in holding vessels with a selected chemical composition at a given temperature. It also makes possible semi-continuous and continuous casting of ductile and compacted graphite cast irons.
    Type: Grant
    Filed: March 29, 1982
    Date of Patent: August 2, 1983
    Assignee: Elkem Metals Company
    Inventor: Henry F. Linebarger
  • Patent number: 4396425
    Abstract: Addition of vanadium to molten iron-base alloys using an agglomerated mixture of V.sub.2 O.sub.3 and calcium-bearing reducing agent.
    Type: Grant
    Filed: March 31, 1981
    Date of Patent: August 2, 1983
    Assignee: Union Carbide Corporation
    Inventors: Gloria M. Faulring, Alan Fitzgibbon, Anthony F. Nasiadka
  • Patent number: 4396427
    Abstract: A method of and a ladle for the treatment of a cast iron melt with a substance capable of inducing the formation of spheroidal graphite utilizes an elongated generally cylindrical vessel lined with a refractory and formed at opposite ends with cylinder bottoms. The vessel can be tilted between a horizontal and upright orientation and angularly displaced about a longitudinal axis at least in its horizontal orientation. A partition in the vessel adjacent one of the cylinder bottoms defines a chamber at one end of the vessel opening within the vessel toward the opposite end thereof and disposed at an upper portion of the vessel in its horizontal orientation. A closable opening at the other end of the vessel enables a cast iron charge to be introduced into the vessel in the horizontal orientation thereof. The vessel is then tilted upwardly to effect the reaction and swung back to its horizontal orientation for deslagging before the charge is tapped by angular displacement about the longitudinal axis.
    Type: Grant
    Filed: February 8, 1982
    Date of Patent: August 2, 1983
    Assignees: Metallgesellschaft Aktiengesellschaft, SKW Trostberg AG
    Inventors: Hubertus A. J. M. Bisschop, Hendrikus Meijers, Jozef J. M. van der Randen
  • Patent number: 4395281
    Abstract: Pig iron is tapped from a blast furnace into a torpedo in which the iron has a treating agent introduced to it while the iron is electromagnetically stirred lengthwise in the torpedo to uniformly distribute the agent throughout the iron while reducing the tendency for skulling in the torpedo.
    Type: Grant
    Filed: December 22, 1981
    Date of Patent: July 26, 1983
    Assignee: Asea AB
    Inventor: Goran Grimfjard
  • Patent number: 4395282
    Abstract: The disclosure provides mixtures for the desulfurization of metal melts, especially steel and crude iron melts, based on CaC.sub.2 --CaO-crystal blends produced in the fused mass. More specifically, the mixtures contain free carbon and carbonate and have a portion of the CaO in the CaC.sub.2 --CaO-crystal blend hydrated to Ca(OH).sub.2. The disclosure also relates to a process for making the mixtures.
    Type: Grant
    Filed: March 18, 1982
    Date of Patent: July 26, 1983
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Albert Braun, Willi Portz, Georg Strauss, Hans-Martin Delhey