ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,534,788, issued on Jan. 27, was assigned to NIPPON STEEL Corp. (Tokyo).
"Steel sheet" was invented by Yasuaki Tanaka (Tokyo), Hitoshi Nikaido (Tokyo), Hiroyuki Kawata (Tokyo) and Natsuko Sugiura (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "There is provided a steel sheet including a chemical composition consisting of, in mass %: C: 0.03 to 0.25%, Si: 0.1 to 2.0%, Mn: 1.0 to 3.0%, P: 0.200% or less, S: 0.0500% or less, Al: 0.01 to 1.00%, N: 0.0100% or less, and Ti: 0.01 to 0.25%, with the balance: Fe and impurities, and a steel micro-structure containing, in area %: ferrite: 50 to 85%, the balance being one or more kinds selected from martensite...