US Patent Issued to JFE Steel on May 26 for "Steel sheet, member, and methods for producing the same" (Japanese Inventors)

ALEXANDRIA, Va., May 26 -- United States Patent no. 12,637,730, issued on May 26, was assigned to JFE Steel Corp. (Tokyo).

"Steel sheet, member, and methods for producing the same" was invented by Takuya Hirashima (Tokyo), Shimpei Yoshioka (Tokyo), Shinjiro Kaneko (Tokyo), Soshi Yoshimoto (Tokyo) and Tomohiro Hashimukai (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "The steel sheet of the present invention has a steel microstructure containing, in area fraction, martensite: from 20% to 100%, ferrite: from 0% to 80%, and another metal phase: 5% or less, and in which a ratio of a dislocation density in metal phases on a surface of the steel sheet to a dislocation density in the metal phases in a thickne...