Shipbuilding & Marine

Seawater is the harshest natural electrolyte: roughly 19,000 ppm chloride, compounded by wet–dry cycling and crevices. The first criterion here is not strength — it is whether the material survives crevice corrosion.

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Typical Components & Material Selection

Component	Grade	Surface / Size	Notes
Deck railings / outfitting	316L	Tube / sections, polished	Salt spray, post-weld passivation
Seawater piping	2205 / 6Mo	Seamless / welded tube	Pitting, flow erosion
LNG tank inner shell	304L / 304	Plate 8–50 mm	Low-temperature toughness, class approval
Accommodation / galley equipment	304 / 316L	8–2 mm, 2B/HL	Cleanability, fingerprint resistance
Fasteners / fixings	316 / 2205	Bar / forgings	Stress corrosion cracking

This is a typical configuration.Actual selection depends on the medium, temperature and welding method— the same component may move from 304 to 316L or 2205. Describing your service conditions is more useful than specifying a grade.

Three practical constraints in this industry

Crevice corrosion is the leading cause of failure

Under washers and where brackets contact the hull, 304 rusts within months. Design out the crevices (continuous welds, drain holes) and upgrade to 316L or 2205.

Confirm class approval early

DNV / ABS / LR / CCS each maintain their own approved material lists. An excellent grade that is not approved will still fail inspection — check at the quotation stage.

Welding distortion accumulates during assembly

Thin outfitting members distort, and errors stack up at final assembly. Use anti-distortion jigs and split pre-fabrication, and leave allowance for adjustment.