ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,559,808, issued on Feb. 24, was assigned to NIPPON STEEL Corp. (Tokyo).
"Hot rolled steel sheet" was invented by Shohei Yabu (Tokyo), Kazumasa Tsutsui (Tokyo) and Takuya Kuwayama (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "This hot roiled steel sheet has a predetermined chemical composition, in which the microstructure contains, by area %, polygonal ferrite: 2.0% or more and less than 10.0% and the remainder in the microstructure: more than 90.0% and 98.0% or less, and a correlation value that is obtained by analyzing the remainder in the microstructure in a SEM image of the microstructure is 0.82 to 0.95, and a maximum probability value is 0....