Patents Represented by Attorney, Agent or Law Firm E. H. Jones, Jr.
  • Patent number: 6673171
    Abstract: A method is provided for producing medium carbon steel sheet and strip with enhanced uniform elongation for deep drawing applications. In one embodiment, a steel slab containing carbon 0.30/0.70%, manganese 0.75/2.0%, silicon up to 1.0% max., total aluminum 0.020/0.10%, the balance iron and incidental impurities is hot rolled to strip at a finishing temperature within the range of 839° C. (1542° F.) to 773° C. (1424° F.) and spheroidize annealed at a temperature below the A1 temperature. In a second embodiment, a steel slab containing 0.40 minimum/0.70% maximum carbon, 0.50/1.50% manganese, up to 1.0% silicon, 0.020/0.10% total aluminum, the balance iron and incidental impurities is hot rolled, cold rolled and spheroidize annealed, with various combinations of manganese and silicon within the above ranges providing lower yield strength at levels of 60 ksi, 70 ksi, and 80 ksi with minimum 14% uniform elongation.
    Type: Grant
    Filed: August 16, 2002
    Date of Patent: January 6, 2004
    Assignee: United States Steel Corporation
    Inventors: Craig O. Hlady, Todd M. Osman