US Patent Issued to NIPPON STEEL on July 29 for "Seamless steel pipe suitable for use in sour environment" (Japanese Inventors)

ALEXANDRIA, Va., July 30 -- United States Patent no. 12,371,765, issued on July 29, was assigned to NIPPON STEEL Corp. (Tokyo).

"Seamless steel pipe suitable for use in sour environment" was invented by Seiya Okada (Tokyo), Hiroki Kamitani (Tokyo), Nobuaki Komatsubara (Tokyo), Yusaku Tomio (Tokyo), Shohei Ikeda (Tokyo) and Naoya Shirasawa (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "The seamless steel pipe according to the present disclosure includes a base material and a decarburized layer formed on the surface of the base material. The chemical composition of the base material consists of, in mass %, C: 0.20 to 0.50%, Si: 0.05 to 0.50%, Mn: 0.01 to 1.00%, P: 0.0300% or less, S: 0.0100% or less, Al...