US Patent Issued to JFE STEEL on March 25 for "High-strength steel sheet and method for producing same" (Japanese Inventors)

ALEXANDRIA, Va., March 26 -- United States Patent no. 12,258,646, issued on March 25, was assigned to JFE STEEL Corp. (Tokyo).

"High-strength steel sheet and method for producing same" was invented by Hidekazu Minami (Tokyo), Yuji Tanaka (Tokyo) and Takeshi Yokota (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A high-strength steel sheet comprises: a chemical composition containing C, Si, Mn, P, S, Al, N, Mo, Cr, Ca, and Sb with a balance consisting of Fe and inevitable impurities, wherein [% Si], [% Mn], [% P], [% Mo], and [% Cr] satisfy a predetermined relationship; a steel microstructure that contains ferrite, hard phase, and retained austenite and in which a carbon concentration in the retained au...