MUMBAI, India, Aug. 17 -- Intellectual Property India has published a patent application (202617084539 A) filed by Hyundai Steel Company on July 09, 2026, for Ultra-High-Strength Galvanized Steel Sheet And Manufacturing Method Thereor.
Inventors include Jang, Min Ho; La, Joung Hyun; Han, Seong Kyung; and Park, Min Suh.
The application for the patent was published on August 14, 2026, under issue no. 33/2026.
Abstract: The present invention provides an ultra-high-strength galvanized steel sheet comprising: a steel sheet composed of an inner layer and a surface layer on the inner layer; and a plating layer on the steel sheet, wherein the surface layer has a thickness of 10-50 µm from the surface of the steel sheet, the inner layer contains, in wt%, 0.1- 0.3% of C, 1.0-2.0% of Si, 2.5-3.5% of Mn, more than 0% and not more than 0.02% of P, and more than 0% and not more than 0.01% of S, with the remainder comprising iron (Fe), the area fraction of tempered martensite in the final microstructure of the inner layer is at least 50%, the surface layer has a lower carbon content than the inner layer and contains, in wt%, 1.0-2.0% of Si, 2.5-3.5% of Mn, more than 0% and not more than 0.02% of P, and more than 0% and not more than 0.01% of S, with the remainder comprising iron (Fe), the area fraction of tempered martensite in the final microstructure of the surface layer is 10% or less, and when grain boundaries having a misorientation of 15-180° in the final microstructure of the steel sheet are classified as high-angle grain boundaries, the ratio of the area fraction of high-angle grain boundaries on the surface to the area fraction of high-angle grain boundaries at a point 1/4 of the thickness of the steel sheet from the surface is 1.2 or more and less than 1.4.
Disclaimer: Curated by HT Syndication.
