South Korea’s Hanwha Ocean and POSCO have entered a strategic partnership to co-develop “giga-class” steel intended to revolutionize the construction of future naval vessels. Hanwha Ocean, known for producing advanced submarines and destroyers for both the Republic of Korea Navy and export clients, will collaborate with POSCO, one of the world’s foremost steel manufacturers, to create an ultra-strong material offering four times the strength of standard shipbuilding steel. The memorandum of understanding outlines cooperation in six research domains, including steel production methods, advanced welding processes, and integration into ship hull designs. The joint research is expected to conclude within two to three years. The development of giga-class steel represents a major leap in naval engineering, offering reduced weight alongside superior strength and resistance, thereby enhancing the survivability, endurance, and performance of both crewed and uncrewed surface vessels. This initiative aligns with a global trend toward advanced naval materials and production infrastructure. Similar modernization efforts are underway in other countries: Austal USA is establishing a submarine module manufacturing facility to support the U.S. Navy’s Columbia- and Virginia-class submarines, while Japan’s Tsuneishi Shipbuilding recently launched a hydrogen-powered tugboat constructed using “green steel” to minimize emissions. Within South Korea, the shipbuilding sector continues to expand aggressively. HD Hyundai Heavy Industries has announced its intention to construct up to five Aegis-equipped destroyers annually for the U.S. Navy, while the domestic KDDX destroyer program remains on schedule to deliver six advanced warships by 2030. Collectively, these efforts underscore South Korea’s determination to secure a global leadership role in next-generation naval manufacturing.
