ALEXANDRIA, Va., Nov. 18 -- United States Patent no. 12,473,621, issued on Nov. 18, was assigned to NIPPON STEEL Corp. (Tokyo).
"Hot-rolled steel sheet" was invented by Genki Abukawa (Tokyo), Masafumi Azuma (Tokyo) and Shohei Yabu (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "This hot-rolled steel sheet has a predetermined chemical composition, the microstructure includes, by volume percentage, 70% or more of martensite, tempered martensite, and bainite in total and 5% to 20% of residual austenite, in a surface layer region that is a range from a surface to a position at 1/10 of a sheet thickness, a sum of an average pole density of an orientation group consisting of {211}greater than111less than to ...