Patents Assigned to Ipsco Inc.
  • Patent number: 4865662
    Abstract: An austenitic stainless steel alloy has a composition of about 6 to about 13 percent aluminum, about 7 to about 34 percent manganese, about 0.2 to about 2.4 percent carbon, 0.4 to about 1.3 percent silicon, about 0 to about 6 percent chromium, about 0.5 to about 6 percent nickel, and the balance essentially iron. The relative quantities of the foregoing elements are selected from these ranges to produce a volume percent of ferrite structure in the alloy in the range of about 1 percent to about 8 percent.
    Type: Grant
    Filed: March 3, 1988
    Date of Patent: September 12, 1989
    Assignee: Ipsco Inc.
    Inventors: James M. Zimmer, William D. Bailey
  • Patent number: 4840051
    Abstract: A series of thermomechanical workings such as temperature-controlled torsional strains are applied to a specimen of steel at strain and temperature levels and interpass times selected to simulate rolling mill conditions. The measured stress values are compared with the temperatures of the steel during the working periods during which the respective values were obtained. Thermomechanical working schedules are repeated at selected varying starting and terminating temperatures thereby to obtain a series of possible rolling schedules. These simulations are selected so that a varying number of reduction passes in the sequence occur at steel temperatures below temperature A.sub.r3. The value of a selected parameter of the worked steel, e.g. yield strength, is measured at ambient temperature.
    Type: Grant
    Filed: June 1, 1987
    Date of Patent: June 20, 1989
    Assignee: Ipsco Inc.
    Inventors: Francisco Boratto, Stephen Yue, John J. Jonas