General projects: Research and development of Marine engineering equipment; Marine engineering key supporting system development; Mechanical equipment research and development; Research and development of metal products; Hardware product development; Manufacturing of metal chains and other metal products; Marine equipment manufacturing; Manufacture of equipment for mariculture and utilization of Marine living resources; Offshore engineering platform equipment manufacturing; Marine engineering equipment manufacturing; Metal structure manufacturing; Hardware product manufacturing; Sales of metal chains and other metal products; Sales of equipment for mariculture and utilization of Marine living resources; Sales of Marine engineering equipment; Metal material sales; Metal structure sales; Hardware products wholesale; Hardware products retail; Import and export of goods; Technology import and export (except for projects subject to approval according to law, independently carry out business activities according to law with business licenses)