US Patent Issued to JFE Steel on Dec. 30 for "Steel sheet, member, and methods for manufacturing the same" (Japanese Inventors)

ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,509,743, issued on Dec. 30, was assigned to JFE Steel Corp. (Tokyo).

"Steel sheet, member, and methods for manufacturing the same" was invented by Tadachika Chiba (Tokyo), Shinjiro Kaneko (Tokyo), Yoichiro Matsui (Tokyo) and Noriaki Kosaka (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A steel sheet has a specified chemical composition and a specified steel microstructure. An average grain size of ferrite and/or bainitic ferrite is 7.0 micro metre or less. On the basis of a distribution in the width direction of the steel sheet, a ratio of a deviation of the grain size of the ferrite and/or the bainitic ferrite to the average grain size of the fe...