ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,428,697, issued on Sept. 30, was assigned to NIPPON STEEL Corp. (Tokyo).
"Steel sheet" was invented by Katsuya Nakano (Tokyo), Kengo Takeda (Tokyo) and Yuya Suzuki (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention provides steel sheet having both bendability and hydrogen embrittlement resistance. The steel sheet of the present invention includes a central part of sheet thickness and a surface sort part formed at one side or both sides of the central part of sheet thickness. The microstructure of the central part of sheet thickness comprises, by volume ratio, 60% or more of tempered martensite, respectively less than 30% of fer...