Application Case: Stainless Steel Applications in Ships and Marine Engineering
Grade selection and welding protection requirements for seawater piping, deck equipment, and cargo tanks.
Common applications in ships and marine engineering:
- Seawater piping: 2205 or copper-nickel alloy; 316L only for low-flow, low-chloride environments.
- Deck equipment and railings: 316L, with brushed or passivated surface for easy maintenance.
- Chemical tanker cargo tanks: select 316L, 2205, 904L, or duplex steel according to cargo type.
Requirements:
- Pickling and passivation are mandatory after welding; weld seams are corrosion initiation points.
- Avoid direct contact with carbon steel (galvanic corrosion); use insulating pads.
- Periodically inspect for pitting and crevice corrosion, especially in ballast tanks and seawater valves.
Standards reference: Classification society rules (CCS/DNV/ABS) set clear requirements for materials and welding.
