MUMBAI, India, June 13 -- Intellectual Property India has published a patent application (202517050747 A) filed by Jfe Steel Corporation, Tokyo, on May 27, for 'method for producing electrical steel sheet equipped with insulating coating film.'
Inventor(s) include Kokufu Karin; and Terashima Takashi.
The application for the patent was published on June 13, under issue no. 24/2025.
According to the abstract released by the Intellectual Property India: "In the present invention, a pretreatment coating film forming agent is applied onto an electrical steel sheet having a forsterite coating film, baking is performed at 130-600 C and in an atmosphere with a hydrogen concentration of 0.01-10.0 vol% to form a pretreatment coating film, cooling to 100 C or lower is subsequently performed, an insulating coating film forming agent is applied onto the pretreatment coating film, and baking is performed at 600-1000 C to form an insulating coating film. In the pretreatment coating film forming agent, the content of a chromium compound is not more than 1.00 parts by mass per 100 parts by mass of phosphate. The insulating coating film forming agent contains a cationic surfactant, and the content of a chromium compound is not more than 1.00 parts by mass, and the content of colloidal silica is 50-250 parts by mass, per 100 parts by mass of phosphate. The total basis weight of the pretreatment coating film and the insulating coating film is not more than 7.5 g/m2. Thus, provided is an electrical steel sheet that is equipped with an insulating coating film and that is excellent in terms of appearance, rust resistance, heat resistance, and space factor."
The patent application was internationally filed on Aug. 03, 2023, under International application No.PCT/JP2023/028419.
Disclaimer: Curated by HT Syndication.
