MUMBAI, India, Sept. 26 -- Intellectual Property India has published a patent application (202517085604 A) filed by Jfe Steel Corporation, Tokyo, on Sept. 9, for 'method for manufacturing hot-dip galvanized steel sheet.'
Inventor(s) include Hoshino Katsuya; Okumura Yusuke; Yamamoto Shunsuke; Terashima Shotaro; Tamaki Shogo; and Nakagaito Tatsuya.
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: "The present invention makes it possible to manufacture a hot-dip galvanized steel sheet of which the surface has a pleasing appearance lacking non-plating, and which has excellent delayed fracture resistance. This method for manufacturing a hot-dip galvanized steel sheet includes annealing a steel sheet in a non-oxidizing atmosphere and then hot-dip galvanizing the steel sheet. The annealing in the non-oxidizing atmosphere includes a first step and a second step. In the first step, a steel sheet is annealed for a predetermined time in a reducing atmosphere having a high hydrogen concentration and a predetermined dew point and temperature so as to reduce the Fe oxide present in the surface layer of the steel sheet. In the subsequent second step, the steel sheet is annealed for a predetermined time in a non-oxidizing atmosphere having a low hydrogen concentration and a predetermined dew point and temperature, and the hydrogen dissolved in the steel is discharged from the steel sheet. If necessary, an oxidation treatment for generating Fe oxide on the surface layer of the steel sheet in a prescribed oxidizing atmosphere is performed before annealing."
The patent application was internationally filed on Apr. 28, 2023, under International application No.PCT/JP2023/016784.
Disclaimer: Curated by HT Syndication.
