Patents by Inventor Jun Wha Hong

Jun Wha Hong 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).

  • Intercritical heat treatment process for toughness improvement of SA 508 GR.3 steel
    Patent number: 6264770
    Abstract: The present invention relates to the heat treatment processes for manufacturing high toughness SA 508 Gr.3 steels including the intercritical heat treatment step in addition to the conventional heat treatment process, wherein the intercritical heat treatment(IHT) is added between the quenching step and the tempering step and is performed at 680° C. to 750° C., which is the ferrite/austenite two phase region, for 1 hour to 8 hours. When compared with the conventional heat treatment process the room temperature impact energy and the upper shelf energy of the steels manufactured by the invention increase significantly and the ductile-to-brittle transition temperature decreases. Also the present invention relates to the modified tempering processes for manufacturing high toughness SA 508 Gr.3 steels, wherein the tempering after the intercritical heat treatment is performed at the temperature lower than 635° C.
    Type: Grant
    Filed: August 10, 1998
    Date of Patent: July 24, 2001
    Assignees: Korea Atomic Energy Research Inst., Korea Electric Power Corporation
    Inventors: Jun Wha Hong, Hong Deuk Kim, Yeon Sang Ahn, Thak Sang Byun, Il Hiun Kuk