US Patent Issued to JFE Steel on March 17 for "High-strength steel sheet and method for manufacturing the same" (Japanese Inventors)

ALEXANDRIA, Va., March 17 -- United States Patent no. 12,577,642, issued on March 17, was assigned to JFE Steel Corp. (Tokyo).

"High-strength steel sheet and method for manufacturing the same" was invented by Kazuki Endoh (Tokyo), Yoshiyasu Kawasaki (Tokyo) and Yuki Toji (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A high-strength steel sheet is disclosed having a specified chemical composition and a steel microstructure composed of, on an area fraction basis, ferrite: 1% to 40%, fresh martensite: less than 1.0%, bainite and tempered martensite in total: 40% to 90%, and retained austenite: 6% or more, wherein a value obtained by dividing an average Mn content (% by mass) of the retained austenite by...