US Patent Issued to NIPPON STEEL on July 1 for "High-strength steel sheet and method for manufacturing same" (Japanese Inventors)

ALEXANDRIA, Va., July 3 -- United States Patent no. 12,344,911, issued on July 1, was assigned to NIPPON STEEL Corp. (Tokyo).

"High-strength steel sheet and method for manufacturing same" was invented by Masafumi Azuma (Tokyo), Eisaku Sakurada (Tokyo), Genki Abukawa (Tokyo), Kenichiro Otsuka (Tokyo) and Takeshi Toyoda (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A high-strength steel sheet includes a predetermined chemical composition, a microstructure contains, by volume percentage, 95% or more of tempered martensite and bainite in total, and a remainder consists of ferrite and pearlite, the microstructure contains 5.0x109 pieces/mm or more of, per unit volume, precipitate having an equivalent circ...