MUMBAI, India, Nov. 2 -- Intellectual Property India has published a patent application (202617094283 A) filed by Jfe Steel Corporation on August 04, 2026, for High-Strength Alloyed Hot-Dip Galvanized Steel Sheet And Manufacturing Method Therefor.
Inventors include Tahara Daisuke; Hoshino Katsuya; Maeda Satoshi; Morimoto Ryohei; and Kawasaki Yoshiyasu.
The application for the patent was published on October 30, 2026, under issue no. 44/2026.
Abstract: Provided is an alloyed hot-dip galvanized steel sheet which has a tensile strength of 780 MPa or more and which has excellent release properties of diffusible hydrogen in the steel sheet. Also provided is a method for manufacturing the same. The high-strength alloyed hot-dip galvanized steel sheet comprises a steel sheet having a predetermined component composition with an alloyed hot-dip galvanizing layer disposed thereon, where the coating weight of the galvanizing layer is 20 g/m2 to 120 g/m2 per steel sheet side. A surface layer of the base steel sheet, which is directly beneath the galvanizing layer and extending up to 100 µm from the surface of the steel sheet in the direction toward the midpoint of the thickness of the steel sheet, has an oxygen content of 0.030 g/m2 or more per side. A plane that is at a depth M [µm] (1 = M = 5) from the surface of the galvanizing layer and that is parallel to the surface of the steel sheet includes intersections of cracks in the galvanizing layer in the amount of at least 100/mm2. The galvanized steel sheet has a diffusible hydrogen content of 0.30 mass ppm or less, and a tensile strength of 780 MPa or more.
Disclaimer: Curated by HT Syndication.
