MUMBAI, India, Nov. 2 -- Intellectual Property India has published a patent application (202617097898 A) filed by Nippon Steel Corporation on August 13, 2026, for Grain-Oriented Electrical Steel Sheet Production Method.
Inventors include Morimoto Shota; Nakamura Shuichi; Yasuda Masato; and Morishige Nobusato.
The application for the patent was published on October 30, 2026, under issue no. 44/2026.
Abstract: Provided is a grain-oriented electrical steel sheet production method, wherein: regarding the particle diameter-number density distribution of precipitates which have equivalent circle diameters D of 50-1,000 nm, a steel sheet after hot-rolled sheet annealing exhibits a mode diameter Dp of 50-350 nm, a mode diameter number density f(Dp) of not less than 1,000,000 particles/g, and a value Wp/Dp, obtained by dividing the mode diameter half-width Wp by the mode diameter Dp, of 0.75-2.25; and in final annealing, during heating, switching to slow heating is performed while the temperature is in the range from 800°C to a final annealing temperature, a switching temperature for the switching to slow heating is more than 880°C but less than 1,010°C, the final annealing temperature is 1,150-1,250°C, the average temperature increase speed for temperatures from 800°C to the switching temperature is not less than 12°C/hour and not more than 50°C/hour, and the average temperature increase speed for temperatures from the switching temperature to the final annealing temperature is not less than 3°C/hour but less than 12°C/hour.
Disclaimer: Curated by HT Syndication.
