US Patent Issued to JFE Steel on Feb. 10 for "Steel sheet, member, and methods for manufacturing the same" (Japanese Inventors)

ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,545,972, issued on Feb. 10, was assigned to JFE Steel Corp. (Tokyo).

"Steel sheet, member, and methods for manufacturing the same" was invented by Katsuya Hata (Tokyo), Shimpei Yoshioka (Tokyo) and Shinjiro Kaneko (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A steel sheet has a certain chemical composition and a steel microstructure containing, in area fraction, martensite: 40% or more and 78% or less, bainite: 20% or more and 58% or less, and retained austenite: 2% or more. Carbides in tempered martensite in the martensite have an average particle size of 0.40 micro metre or less, an average amount of C in the retained austenite is 0.5% by mas...