Patents Assigned to Krupp Stahl Aktiengesellschaft
  • Method for reducing internal stresses of roller straightened rails
    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
  • Rail having high resistance to wear in its head and high resistance to rupture in its foot
    Patent number: 4575397
    Abstract: The invention relates to a rail having high resistance to wear in its head and high resistance to rupture in its foot. It is the characteristic feature of the invention that after rolling followed by heat treatment the rail has a fine pearlitic structure in the head and a martensitic annealed grain structure in the foot. The invention also includes preferred methods of heat treatment for the rail.
    Type: Grant
    Filed: October 1, 1984
    Date of Patent: March 11, 1986
    Assignee: Krupp Stahl Aktiengesellschaft
    Inventor: Wilhelm Heller
  • Spout-filling mass
    Patent number: 4525463
    Abstract: A spout-filling mass which is retained in place by a slider in the pouring spout of a metal-casting ladle consists essentially of 35 to 65% by weight chromite, (chromium ore with 42 to 45% Cr.sub.2 O.sub.3), 3 to 25% by weight carbon and the balance quartz sand. The mass, which fills the cylindrical portion of the spout, is formed into a pile on the floor of the ladle above the spout and upon contact with the molten metal fuses into a thin shell which, upon movement of the slider to bring its opening into registry with the spout, is ruptured by the molten metal after the underlying support for the shell is discharged through the spout.
    Type: Grant
    Filed: November 3, 1982
    Date of Patent: June 25, 1985
    Assignees: Heinz Dislich, Krupp Stahl Aktiengesellschaft
    Inventors: Heinz Dislich, Horst Richter
  • Vibration-damped wheel for rail vehicles
    Patent number: 4496183
    Abstract: A rail wheel has in one of its rim surfaces, preferably the inner one, a circumferential undercut groove. Vibration-damping elements are connected to the wheel by means of screws which either engage in the undercut groove via appropriately shaped heads, or are threaded into wedges lodged in the groove.
    Type: Grant
    Filed: August 17, 1981
    Date of Patent: January 29, 1985
    Assignee: Krupp Stahl Aktiengesellschaft
    Inventors: Willi Kasper, Helmut Licht, Erwin Raquet, Jurgen Schneider