ALEXANDRIA, Va., Aug. 5 -- United States Patent no. 12,698,543, issued on Aug. 4, was assigned to NIPPON STEEL Corp. (Tokyo).
"Hot-stretch-reduced electric resistance welded pipe" was invented by Kenzo Tashima (Tokyo), Kensuke Nagai (Tokyo), Tatsuo Yokoi (Tokyo), Mitsuhiro Hamaishi (Tokyo) and Takashi Tsusue (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hot-stretch-reduced electric resistance welded pipe has a base metal portion and a weld portion, the base metal portion has a predetermined chemical composition, a Ti/N value obtained by dividing Ti content by N content is 3.0 or more, in a microstructure of the weld portion, the average grain diameter is 10.0 micro metre or less, the area ratio of ...