Patents by Inventor Mutsuhiro Miyakawa

Mutsuhiro Miyakawa 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).

  • Low alloy steel having good stress corrosion cracking resistance
    Patent number: 4820486
    Abstract: The present invention relates to low alloy steel and specifically to nickel-chrome-molybdenum steel.A low alloy steel having excellent stress corrosion cracking resistance containing C:.ltoreq.0.40%, Si:.ltoreq.0.15%, Mn:.ltoreq.0.20%, P:.ltoreq.0.010%, S:.ltoreq.0.030%, Ni: 0.50 to 4.00%, Cr: 0.50 to 2.50%, Mo: 0.25 to 4.00% and V:.ltoreq.0.30%, said Si, Mn and P being fulfilled with relationship of Si+Mn+20P.ltoreq.0.30%, the remainder comprising Fe and unavoidable impurities, the prior austenite crystal grain size being in excess of 4 of ASTM crystal grain size number.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: April 11, 1989
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Kazutoshi Shimogori, Kazuo Fujiwara, Kiyoshi Sugie, Kikuo Morita, Takenori Nakayama, Mutsuhiro Miyakawa, Yasushi Torii