Sejin Heavy Industries, The Republic of Korea - Komachine Supplier Profile and Product List

- Sejin Heavy Industries, established in 1999, is a specialized company in ship blocks, processes, production, and marine equipment. It is a global leader with the world's largest production capacity and market share in Deck Houses and LPG Cargo Tanks. Leveraging its expertise in manufacturing large-scale structures for shipbuilding and offshore plants, the company is expanding into new and renewable energy sectors, including floating offshore wind substructures and offshore substations. The company maintains stable growth through exclusive supply agreements with major domestic shipbuilders.Sejin Heavy Industries, established in 1999, is a specialized company in ship blocks, processes, production, and marine equipment. It is a global leader with the world's largest production capacity and market share in Deck Houses and LPG Cargo Tanks. Leveraging its expertise in manufacturing large-scale structures for shipbuilding and offshore plants, the company is expanding into new and renewable energy sectors, including floating offshore wind substructures and offshore substations. The company maintains stable growth through exclusive supply agreements with major domestic shipbuilders.
- Deck House: The living space for crew members on a vessel, also housing navigation and communication facilities. Comprising 4 to 9 floors depending on ship size, it includes cabins for the captain, chief engineer, officers, and crew, along with various amenities. This product achieves the world's largest annual production volume and is exclusively supplied to major domestic shipyards.Deck House: The living space for crew members on a vessel, also housing navigation and communication facilities. Comprising 4 to 9 floors depending on ship size, it includes cabins for the captain, chief engineer, officers, and crew, along with various amenities. This product achieves the world's largest annual production volume and is exclusively supplied to major domestic shipyards.
- Upper Deck Unit: The uppermost deck of a ship's hull, extending from bow to stern. It consists of piping for fluid/gas transfer, electrical cables for machinery power, walkways for crew movement, and various steel outfitting items. The company specializes in manufacturing Upper Deck Units for Tanker ships (Crude Oil, Product, Chemical Tankers) and LPG carriers, which require diverse steel outfitting items on the upper deck.Upper Deck Unit: The uppermost deck of a ship's hull, extending from bow to stern. It consists of piping for fluid/gas transfer, electrical cables for machinery power, walkways for crew movement, and various steel outfitting items. The company specializes in manufacturing Upper Deck Units for Tanker ships (Crude Oil, Product, Chemical Tankers) and LPG carriers, which require diverse steel outfitting items on the upper deck.
- LPG Cargo Tank: A storage vessel for liquefied petroleum gas, installed in the cargo hold of LPG carriers. It stores gas in a liquefied state below its boiling point, requiring advanced technology for perfect welding and insulation, utilizing nickel steel and LT steel resistant to low temperatures. Since its initial delivery in 2005, the company has continuously accumulated technology, securing exclusive contracts for LPG tanks from major domestic LPG carrier builders.LPG Cargo Tank: A storage vessel for liquefied petroleum gas, installed in the cargo hold of LPG carriers. It stores gas in a liquefied state below its boiling point, requiring advanced technology for perfect welding and insulation, utilizing nickel steel and LT steel resistant to low temperatures. Since its initial delivery in 2005, the company has continuously accumulated technology, securing exclusive contracts for LPG tanks from major domestic LPG carrier builders.
- LNG/LEG/Ammonia/LCO2 Tank: High-specification products for storing liquefied natural gas, ethylene gas, ammonia gas, and liquefied carbon dioxide. These products require perfect welding and insulation to withstand high pressure and ultra-low temperatures. The company successfully entered the LNG Tank market in 2019, following its first LEG Tank order in 2017, and holds references for ammonia and LCO2 tank supplies.LNG/LEG/Ammonia/LCO2 Tank: High-specification products for storing liquefied natural gas, ethylene gas, ammonia gas, and liquefied carbon dioxide. These products require perfect welding and insulation to withstand high pressure and ultra-low temperatures. The company successfully entered the LNG Tank market in 2019, following its first LEG Tank order in 2017, and holds references for ammonia and LCO2 tank supplies.
- Living Quarter: A 4-to-6-story offshore structure installed on offshore facilities, serving as living and working spaces for over 200 crew members on offshore oil drilling platforms. Often referred to as a 'floating hotel,' it includes helicopter landing facilities, water treatment plants, generators, communication control systems, and various recreational and medical facilities, representing a high-value-added business.Living Quarter: A 4-to-6-story offshore structure installed on offshore facilities, serving as living and working spaces for over 200 crew members on offshore oil drilling platforms. Often referred to as a 'floating hotel,' it includes helicopter landing facilities, water treatment plants, generators, communication control systems, and various recreational and medical facilities, representing a high-value-added business.
- Topside Module: A critical module for offshore oil and gas production facilities. Through government R&D projects, the company has developed core equipment localization and production process technologies, enhancing its technological competitiveness in the high-value-added offshore plant market.Topside Module: A critical module for offshore oil and gas production facilities. Through government R&D projects, the company has developed core equipment localization and production process technologies, enhancing its technological competitiveness in the high-value-added offshore plant market.
- Wind Business: A business segment focused on manufacturing key components for new and renewable energy, including floating offshore wind substructures (Floaters) and offshore substations (OSS). The company leverages its experience in large-scale structure manufacturing and offshore plant technology to lead the market for large-scale, modular wind energy components.Wind Business: A business segment focused on manufacturing key components for new and renewable energy, including floating offshore wind substructures (Floaters) and offshore substations (OSS). The company leverages its experience in large-scale structure manufacturing and offshore plant technology to lead the market for large-scale, modular wind energy components.
- World's No. 1 Market Share: The company holds the world's largest production capacity and market share in Deck Houses and LPG Cargo Tanks.World's No. 1 Market Share: The company holds the world's largest production capacity and market share in Deck Houses and LPG Cargo Tanks.
- Exclusive Supply to Major Korean Shipbuilders: The sole domestic company supplying large-scale marine equipment to all three major Korean shipbuilders: HD Hyundai Heavy Industries, Hyundai Mipo Dockyard, Hanwha Ocean, and Samsung Heavy Industries.Exclusive Supply to Major Korean Shipbuilders: The sole domestic company supplying large-scale marine equipment to all three major Korean shipbuilders: HD Hyundai Heavy Industries, Hyundai Mipo Dockyard, Hanwha Ocean, and Samsung Heavy Industries.
- Largest Production Infrastructure: Possessing a vast and flat production site of approximately 200,000 pyeong (654,000 sqm) in Ulsan Onsan, establishing itself as the world's largest ship block manufacturer. The company has an efficient block production line with an annual capacity of 130 Deck Houses, 30 LPG Tanks, and 1 offshore plant module.Largest Production Infrastructure: Possessing a vast and flat production site of approximately 200,000 pyeong (654,000 sqm) in Ulsan Onsan, establishing itself as the world's largest ship block manufacturer. The company has an efficient block production line with an annual capacity of 130 Deck Houses, 30 LPG Tanks, and 1 offshore plant module.
- Unrivaled Technology and Know-how: Possessing expertise in LPG/LNG/LEG/Ammonia/LCO2 tank manufacturing and having obtained AIP certification for the world's largest LNG fuel tank design, demonstrating its technological leadership in the eco-friendly alternative fuel tank market. The company holds top-tier professional technology and know-how in Deck House and Upper Deck Unit manufacturing in Korea.Unrivaled Technology and Know-how: Possessing expertise in LPG/LNG/LEG/Ammonia/LCO2 tank manufacturing and having obtained AIP certification for the world's largest LNG fuel tank design, demonstrating its technological leadership in the eco-friendly alternative fuel tank market. The company holds top-tier professional technology and know-how in Deck House and Upper Deck Unit manufacturing in Korea.
- Superior Profitability: Recording the highest profitability among listed companies in the shipbuilding value chain, with a consolidated operating profit margin of 18.1% and a separate operating profit margin of 19.0% in Q1 2025. Anticipated growth to an operating profit margin of 20.5% by 2027, with a target of delivering 40 tanks annually.Superior Profitability: Recording the highest profitability among listed companies in the shipbuilding value chain, with a consolidated operating profit margin of 18.1% and a separate operating profit margin of 19.0% in Q1 2025. Anticipated growth to an operating profit margin of 20.5% by 2027, with a target of delivering 40 tanks annually.
- Business Diversification and Future Growth Engines: Successfully expanding its business beyond marine equipment into new and renewable energy sectors, such as floating offshore wind substructures and offshore substations, securing future growth engines.Business Diversification and Future Growth Engines: Successfully expanding its business beyond marine equipment into new and renewable energy sectors, such as floating offshore wind substructures and offshore substations, securing future growth engines.
- Shipbuilding IndustryShipbuilding Industry
- Offshore Plant IndustryOffshore Plant Industry
- Renewable Energy Industry (Offshore Wind)Renewable Energy Industry (Offshore Wind)
- South Korea, VietnamSouth Korea, Vietnam
- USAUSA
- BrazilBrazil
- ISO 9001 certification (December 2000)ISO 9001 certification (December 2000)
- OHSAS 18001 certification (January 2010)OHSAS 18001 certification (January 2010)
- ISO 14001 certification (June 2017)ISO 14001 certification (June 2017)
- ASME (U, S, U2, PP) certification (December 2004)ASME (U, S, U2, PP) certification (December 2004)
- AJQS certification (April 2010)AJQS certification (April 2010)
- Best HRD (Human Resources Development) Excellent Institution certification (September 2010)Best HRD (Human Resources Development) Excellent Institution certification (September 2010)
- Bonded Factory Special Permit acquisition (February 2017)Bonded Factory Special Permit acquisition (February 2017)
- AIP (Approval in Principle) for 3,750㎥ class LNG Fuel Tank basic design (Lloyd's Register, December 2021)AIP (Approval in Principle) for 3,750㎥ class LNG Fuel Tank basic design (Lloyd's Register, December 2021)
- Holds 6 patentsHolds 6 patents