Patents Assigned to O & K Company Ltd.
  • Furnace for the heat treatment of scale-covered steel
    Patent number: 4397451
    Abstract: A scale-covered, hot-rolled steel work is heated under a reducing atmosphere and is then allowed to slowly cool while placed under the reducing atmosphere. Thereafter the work is maintained at a predetermined temperature under an oxidizing atmosphere to cause the scale to be re-oxidized. The work with the re-oxidizing scale is then allowed to stand to cool quickly, imparting fine cracks to the scales. The scales can readily be removed from the work during the subsequent pickling step.
    Type: Grant
    Filed: February 17, 1982
    Date of Patent: August 9, 1983
    Assignees: Chugai Ro Kogyo Co., Ltd., O & K Company Ltd.
    Inventors: Keizo Kinoshita, Koji Murakami, Hitoshi Ohta