South Korea’s Hanwha Ocean and POSCO have entered a strategic partnership to develop next-generation “giga-class” steel tailored for advanced naval vessels. Hanwha Ocean, a major producer of submarines and destroyers for the Republic of Korea Navy and international clients, will collaborate with POSCO, one of the world’s leading steelmakers known for high-performance alloys. The memorandum of understanding outlines joint research across six key areas, including steel production, welding innovations, and ship hull integration. The development phase is expected to last two to three years, with the resulting material intended to redefine naval construction standards. Giga-class steel is estimated to be four times stronger than conventional shipbuilding steel, offering enhanced durability while significantly reducing overall vessel weight. These properties promise improved maneuverability, stability, and survivability for both manned warships and uncrewed surface vessels. The collaboration reflects South Korea’s broader ambition to elevate its maritime defense capabilities amid intensifying global competition in naval technology. The initiative parallels similar advancements elsewhere: in the US, Austal USA began constructing a modern submarine module facility in 2024 to support Columbia- and Virginia-class submarines, while Japan’s Tsuneishi Shipbuilding launched a hydrogen-powered tugboat using “green steel.” Domestically, South Korea continues expanding its naval programs, including HD Hyundai Heavy Industries’ plan to produce up to five Aegis destroyers annually for the US Navy. The indigenous KDDX destroyer program also remains on track, with six advanced vessels expected by 2030. Together, these developments signal a global shift toward sustainable, high-strength materials driving the future of naval shipbuilding.
