ALEXANDRIA, Va., June 9 -- United States Patent no. 12,286,683, issued on April 29, was assigned to Kobe Steel Ltd. (Kobe, Japan).
"High-strength steel sheet having excellent delayed fracture resistance" was invented by Kosuke Shibata (Kobe, Japan), Junichiro Kinugasa (Kobe, Japan), Keisuke Nakata (Kakogawa, Japan) and Atsuhiro Shiraki (Kakogawa, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A high-strength steel sheet with excellent delayed fracture resistance, having a tensile strength of 1700 MPa or larger, including a predetermined component composition, having a martensite structure whose ratio accounts for 95 area % or more of the entire metallographic structure, and having a transition metal ca...