Patents by Inventor Masakazu Oshimi

Masakazu Oshimi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for producing galvanized, non-aging cold rolled steel sheets having good formability in a continuous galvanizing line
    Patent number: 5074924
    Abstract: A process for producing a non-aging galvanized steel sheet having good formability in a continuous galvanizing production line, which comprises heating a low carbon, Al-killed cold rolled steel sheet at a temperature not lower than a recrystallizing temperature, reducing the surface of the steel sheet thus heated in a reducing atmosphere, cooling the steel sheet to a temperature (T.sub.E) ranging from 200.degree. to 350.degree. C. from a temperature not lower than 600.degree. C. at a cooling rate not less than 30.degree. C/s, holding the steel sheet at the temperature (T.sub.E) for 0 to less than 10 seconds, reheating the steel sheet to a temperature ranging from 430.degree. to 500.degree. C. at a heating rate not less than 10.degree. C/s, immersing the steel sheet into a molten zinc bath, cooling the steel sheet thus galvanized to a temperature not higher than 370.degree. C., and subjecting the steel sheet to an overaging treatment to a temperature range from 250.degree. to 320.degree. C.
    Type: Grant
    Filed: June 21, 1990
    Date of Patent: December 24, 1991
    Assignee: Nippon Steel Corporation
    Inventors: Kohsaku Ushioda, Osamu Akisue, Naoki Yoshinaga, Tomohisa Katayama, Masakazu Oshimi