ALEXANDRIA, Va., March 31 -- United States Patent no. 12,590,350, issued on March 31, was assigned to JFE Steel Corp. (Tokyo).
"Steel sheet, member, and method for producing them" was invented by Yoshiyasu Kawasaki (Tokyo), Tatsuya Nakagaito (Tokyo), Shunsuke Yamamoto (Tokyo) and Katsuya Hoshino (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A steel sheet and a member with a TS of 590 MPa or more and a method for producing them are disclosed. A base steel sheet has a specified chemical composition. When nanohardness is measured at 300 points or more in a 50 micro metrex50 micro metre region on a sheet surface at a quarter depth position, the ratio of a nanohardness of 7.0 GPa or more is 0.10 or less, ...