MUMBAI, India, Aug. 1 -- Intellectual Property India has published a patent application (202517058069 A) filed by Nippon Steel Corporation, Tokyo, on June 17, for 'cold-rolled steel sheet and method for producing same.'
Inventor(s) include Igarashi Kosuke; Yokoyama Takafumi; and Tsunemi Yusuke.
The application for the patent was published on Aug. 1, under issue no. 31/2025.
According to the abstract released by the Intellectual Property India: "This cold-rolled steel sheet has a specific chemical composition, and a surface layer part thereof ranging from the surface to a depth of 10 m to 20 m in the sheet thickness direction has a metal structure which contains, in volume percentage, 10% to 95% of ferrite, with the balance being made up of one or more selected from among martensite, bainite, pearlite, cementite and residual austenite. At a position of 1/4 the thickness ranging from 1/8 to 3/8 of the sheet thickness from the surface in the sheet thickness direction, the metal structure contains, in volume percentage, 0% to 60% of ferrite and 0% to 3% of residual austenite, with the balance being made up of one or more selected from among martensite and bainite. The volume percentage of tempered martensite in the martensite is 50% or more. The ratio of the dislocation density of the surface layer part to the dislocation density at the position of 1/4 the thickness is not less than 0.20 but less than 0.90. The tensile strength of this cold-rolled steel sheet is 1,180 MPa or more."
The patent application was internationally filed on Jan. 19, 2024, under International application No.PCT/JP2024/001520.
Disclaimer: Curated by HT Syndication.
