MUMBAI, India, Sept. 26 -- Intellectual Property India has published a patent application (202517081147 A) filed by Jfe Steel Corporation, Tokyo, on Aug. 27, for 'high-strength steel sheet and manufacturing method therefor.'
Inventor(s) include Ishito Ryusuke; Tobata Junya; Minami Hidekazu; and Toji Yuki.
The application for the patent was published on Sept. 26, under issue no. 39/2025.
According to the abstract released by the Intellectual Property India: "Provided is a high-strength steel sheet that has a tensile strength of 980 MPa or higher, that is superior in terms of the ductility and the delayed fracture resistance, and that has a large optimal clearance range with respect to bending molding of a sheared end surface. In the aforementioned high-strength steel sheet, 0.030-0.500% of C, 0.50-2.50% of Si, 1.50-5.00% of Mn, 0.100% or less of P, 0.0200% or less of S, 1.000% or less of Al, 0.0100% or less of N, 0.0100% or less of O, and 0.005-0.100% of Nb are contained in terms of mass%, the remainder consists of Fe and inevitable impurities, the martensite amount is 60% or more, the residual austenite amount is 3-20%, the sum of the ferrite amount and the bainitic ferrite amount is greater than 10%, the instability index k of the residual austenite is less than 5.9, and the instability index d of the residual austenite in the processing initial period is less than 5.8."
The patent application was internationally filed on Mar. 05, 2024, under International application No.PCT/JP2024/008249.
Disclaimer: Curated by HT Syndication.
