ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,522,905, issued on Jan. 13, was assigned to NIPPON STEEL Corp. (Tokyo).
"Duplex stainless steel seamless pipe" was invented by Mikiko Noguchi (Tokyo), Jun Nakamura (Tokyo), Masayuki Sagara (Tokyo), Daisuke Matsuo (Tokyo) and Yoshihei Wakino (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "The duplex stainless steel seamless pipe according to the present disclosure has the chemical composition described in the description and a microstructure consisting of 30 to 55% of ferrite, and austenite. In a square observation field of view region with sides of 250 micro metre including a center portion of the wall thickness and including a T direction and a C...