US Patent Issued to NIPPON STEEL on July 1 for "Martensitic stainless steel pipe and method of manufacturing the same" (Japanese Inventors)

ALEXANDRIA, Va., July 3 -- United States Patent no. 12,344,940, issued on July 1, was assigned to NIPPON STEEL Corp. (Tokyo).

"Martensitic stainless steel pipe and method of manufacturing the same" was invented by Mikiko Noguchi (Tokyo) and Takashi Yamaguchi (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of manufacturing a martensitic stainless steel pipe includes: preparing a hollow shell, S1; a pickling step, S3-2, in which the hollow shell is immersed in nitrohydrofluoric acid solution at a temperature below 50deg C.; after pickling step S3-2, a high-pressure water washing step, S4, in which high-pressure water is injected onto the outer surface of the hollow shell to clean the outer surfa...