MUMBAI, India, May 30 -- Intellectual Property India has published a patent application (202517035122 A) filed by Jfe Steel Corporation, Tokyo, on April 10, for 'high-strength hot-rolled steel sheet, and method for producing same.'
Inventor(s) include Hasegawa Hiroshi; Matsuda Hiroshi; and Tobita Shunsuke.
The application for the patent was published on May 30, under issue no. 22/2025.
According to the abstract released by the Intellectual Property India: "Provided is a high-strength hot-rolled steel sheet having excellent post-heating strength, toughness, and delayed fracture resistance. The high-strength hot-rolled steel sheet has a component composition containing, by mass%, 0.06-0.23% of C, 0.1-3.0% of Si, 1.5-3.5% of Mn, 0-0.050% (exclusive of 0) of P, 0-0.0050% (exclusive of 0) of S, 0-1.5% (exclusive of 0) of Al, 0-0.010% (exclusive of 0) of N, 0-0.003% (exclusive of 0) of O, and 0.040-0.200% of a total of Ti and Nb, with the balance consisting of Fe and unavoidable impurities, wherein: the steel structure has martensite and/or lower bainite as a main phase; the retained austenite is less than 3% by volume; (Ti in solid solution + Nb in solid solution)/(total Ti amount + total Nb amount) is 0.300-0.800 (exclusive of 0.800); the total amount of Ti and Nb present as precipitates having a particle diameter of at least 100 nm is 0.010-0.030 mass%; and the [110]111 orientation pole density in the surface layer region is 1.8-5.0."
The patent application was internationally filed on Nov. 17, 2023, under International application No.PCT/JP2023/041535.
Disclaimer: Curated by HT Syndication.
