- Business
- Sejin Heavy Industries Co., Ltd. manufactures and sells mega-sized shipbuilding equipment and offshore components in South Korea. The company produces deck houses including engine casings, funnels, radar masts, and wing bridges; upper deck units for crude oil tankers, product carriers, chemical tankers, and LPG carriers; LPG and LNG cargo tanks; topside and plant modules such as ring blocks, gorgons, and engine rooms; living quarters for offshore structure crews; burner booms, flare towers, and claire ridges; and floating offshore wind equipment. Founded in 1999 and headquartered in Ulsan with factories in Wonsan-ri and Haknam-ri plus a subsidiary in Vietnam, Sejin serves major domestic shipbuilders including HD Hyundai Heavy Industries, HD Hyundai Mipo, Samsung Heavy Industries, and Hanwha Ocean across shipbuilding and plant segments; it targets global maritime and renewable energy markets with approximately 335 employees. Recent developments include securing its first deck house supply contract with Hanwha Ocean in June 2024 to diversify clients among Korea's big-three shipbuilders; receiving an initial LPG tank order from Samsung Heavy Industries; earning an Approval-in-Principle (AiP) award from Korean Register at Kormarine 2025 for a compact hydrogen fuel supply system; planning Vietnamese shipyard expansion by 2027 to boost LPG tank production capacity to 40 units annually; and positioning for floating offshore wind substructure orders amid strong gas carrier demand driving profit growth in 2025.