ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,503,744, issued on Dec. 23, was assigned to ArcelorMittal (Luxembourg).
"Hot rolled and heat-treated steel sheet and method of manufacturing the same" was invented by Astrid Perlade (Le Ban-Saint-Martin, France), Kangying Zhu (Metz, France), Coralie Jung (Metz, France) and Frederic Kegel (Yutz, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "A hot rolled and heat-treated steel sheet having a composition including, by weight percent C 0.12-0.25% Mn 3.0-8.0%, Si 0.70-1.50%, Al 0.3-1.2%, B 0.0002-0.004%, Sless than equal to0.010%, Pless than equal to0.020%, Nless than equal to0.008%, the remainder of the composition being iron and unavoidable impurit...